drivers/usb/typec/tcpm/tcpm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2015-2017 Google, Inc
   4  *
   5  * USB Power Delivery protocol stack.
   6  */
   7
   8 #include <linux/completion.h>
   9 #include <linux/debugfs.h>
  10 #include <linux/device.h>
  11 #include <linux/hrtimer.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/kernel.h>
  14 #include <linux/kthread.h>
  15 #include <linux/module.h>
  16 #include <linux/mutex.h>
  17 #include <linux/power_supply.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/property.h>
  20 #include <linux/sched/clock.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/slab.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/pd.h>
  26 #include <linux/usb/pd_ado.h>
  27 #include <linux/usb/pd_bdo.h>
  28 #include <linux/usb/pd_ext_sdb.h>
  29 #include <linux/usb/pd_vdo.h>
  30 #include <linux/usb/role.h>
  31 #include <linux/usb/tcpm.h>
  32 #include <linux/usb/typec_altmode.h>
  33
  34 #include <uapi/linux/sched/types.h>
  35
  36 #define FOREACH_STATE(S)                        \
  37         S(INVALID_STATE),                       \
  38         S(TOGGLING),                    \
  39         S(SRC_UNATTACHED),                      \
  40         S(SRC_ATTACH_WAIT),                     \
  41         S(SRC_ATTACHED),                        \
  42         S(SRC_STARTUP),                         \
  43         S(SRC_SEND_CAPABILITIES),               \
  44         S(SRC_SEND_CAPABILITIES_TIMEOUT),       \
  45         S(SRC_NEGOTIATE_CAPABILITIES),          \
  46         S(SRC_TRANSITION_SUPPLY),               \
  47         S(SRC_READY),                           \
  48         S(SRC_WAIT_NEW_CAPABILITIES),           \
  49                                                 \
  50         S(SNK_UNATTACHED),                      \
  51         S(SNK_ATTACH_WAIT),                     \
  52         S(SNK_DEBOUNCED),                       \
  53         S(SNK_ATTACHED),                        \
  54         S(SNK_STARTUP),                         \
  55         S(SNK_DISCOVERY),                       \
  56         S(SNK_DISCOVERY_DEBOUNCE),              \
  57         S(SNK_DISCOVERY_DEBOUNCE_DONE),         \
  58         S(SNK_WAIT_CAPABILITIES),               \
  59         S(SNK_NEGOTIATE_CAPABILITIES),          \
  60         S(SNK_NEGOTIATE_PPS_CAPABILITIES),      \
  61         S(SNK_TRANSITION_SINK),                 \
  62         S(SNK_TRANSITION_SINK_VBUS),            \
  63         S(SNK_READY),                           \
  64                                                 \
  65         S(ACC_UNATTACHED),                      \
  66         S(DEBUG_ACC_ATTACHED),                  \
  67         S(AUDIO_ACC_ATTACHED),                  \
  68         S(AUDIO_ACC_DEBOUNCE),                  \
  69                                                 \
  70         S(HARD_RESET_SEND),                     \
  71         S(HARD_RESET_START),                    \
  72         S(SRC_HARD_RESET_VBUS_OFF),             \
  73         S(SRC_HARD_RESET_VBUS_ON),              \
  74         S(SNK_HARD_RESET_SINK_OFF),             \
  75         S(SNK_HARD_RESET_WAIT_VBUS),            \
  76         S(SNK_HARD_RESET_SINK_ON),              \
  77                                                 \
  78         S(SOFT_RESET),                          \
  79         S(SRC_SOFT_RESET_WAIT_SNK_TX),          \
  80         S(SNK_SOFT_RESET),                      \
  81         S(SOFT_RESET_SEND),                     \
  82                                                 \
  83         S(DR_SWAP_ACCEPT),                      \
  84         S(DR_SWAP_SEND),                        \
  85         S(DR_SWAP_SEND_TIMEOUT),                \
  86         S(DR_SWAP_CANCEL),                      \
  87         S(DR_SWAP_CHANGE_DR),                   \
  88                                                 \
  89         S(PR_SWAP_ACCEPT),                      \
  90         S(PR_SWAP_SEND),                        \
  91         S(PR_SWAP_SEND_TIMEOUT),                \
  92         S(PR_SWAP_CANCEL),                      \
  93         S(PR_SWAP_START),                       \
  94         S(PR_SWAP_SRC_SNK_TRANSITION_OFF),      \
  95         S(PR_SWAP_SRC_SNK_SOURCE_OFF),          \
  96         S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
  97         S(PR_SWAP_SRC_SNK_SINK_ON),             \
  98         S(PR_SWAP_SNK_SRC_SINK_OFF),            \
  99         S(PR_SWAP_SNK_SRC_SOURCE_ON),           \
 100         S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP),    \
 101                                                 \
 102         S(VCONN_SWAP_ACCEPT),                   \
 103         S(VCONN_SWAP_SEND),                     \
 104         S(VCONN_SWAP_SEND_TIMEOUT),             \
 105         S(VCONN_SWAP_CANCEL),                   \
 106         S(VCONN_SWAP_START),                    \
 107         S(VCONN_SWAP_WAIT_FOR_VCONN),           \
 108         S(VCONN_SWAP_TURN_ON_VCONN),            \
 109         S(VCONN_SWAP_TURN_OFF_VCONN),           \
 110                                                 \
 111         S(FR_SWAP_SEND),                        \
 112         S(FR_SWAP_SEND_TIMEOUT),                \
 113         S(FR_SWAP_SNK_SRC_TRANSITION_TO_OFF),                   \
 114         S(FR_SWAP_SNK_SRC_NEW_SINK_READY),              \
 115         S(FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED), \
 116         S(FR_SWAP_CANCEL),                      \
 117                                                 \
 118         S(SNK_TRY),                             \
 119         S(SNK_TRY_WAIT),                        \
 120         S(SNK_TRY_WAIT_DEBOUNCE),               \
 121         S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS),    \
 122         S(SRC_TRYWAIT),                         \
 123         S(SRC_TRYWAIT_DEBOUNCE),                \
 124         S(SRC_TRYWAIT_UNATTACHED),              \
 125                                                 \
 126         S(SRC_TRY),                             \
 127         S(SRC_TRY_WAIT),                        \
 128         S(SRC_TRY_DEBOUNCE),                    \
 129         S(SNK_TRYWAIT),                         \
 130         S(SNK_TRYWAIT_DEBOUNCE),                \
 131         S(SNK_TRYWAIT_VBUS),                    \
 132         S(BIST_RX),                             \
 133                                                 \
 134         S(GET_STATUS_SEND),                     \
 135         S(GET_STATUS_SEND_TIMEOUT),             \
 136         S(GET_PPS_STATUS_SEND),                 \
 137         S(GET_PPS_STATUS_SEND_TIMEOUT),         \
 138                                                 \
 139         S(GET_SINK_CAP),                        \
 140         S(GET_SINK_CAP_TIMEOUT),                \
 141                                                 \
 142         S(ERROR_RECOVERY),                      \
 143         S(PORT_RESET),                          \
 144         S(PORT_RESET_WAIT_OFF),                 \
 145                                                 \
 146         S(AMS_START),                           \
 147         S(CHUNK_NOT_SUPP)
 148
 149 #define FOREACH_AMS(S)                          \
 150         S(NONE_AMS),                            \
 151         S(POWER_NEGOTIATION),                   \
 152         S(GOTOMIN),                             \
 153         S(SOFT_RESET_AMS),                      \
 154         S(HARD_RESET),                          \
 155         S(CABLE_RESET),                         \
 156         S(GET_SOURCE_CAPABILITIES),             \
 157         S(GET_SINK_CAPABILITIES),               \
 158         S(POWER_ROLE_SWAP),                     \
 159         S(FAST_ROLE_SWAP),                      \
 160         S(DATA_ROLE_SWAP),                      \
 161         S(VCONN_SWAP),                          \
 162         S(SOURCE_ALERT),                        \
 163         S(GETTING_SOURCE_EXTENDED_CAPABILITIES),\
 164         S(GETTING_SOURCE_SINK_STATUS),          \
 165         S(GETTING_BATTERY_CAPABILITIES),        \
 166         S(GETTING_BATTERY_STATUS),              \
 167         S(GETTING_MANUFACTURER_INFORMATION),    \
 168         S(SECURITY),                            \
 169         S(FIRMWARE_UPDATE),                     \
 170         S(DISCOVER_IDENTITY),                   \
 171         S(SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY), \
 172         S(DISCOVER_SVIDS),                      \
 173         S(DISCOVER_MODES),                      \
 174         S(DFP_TO_UFP_ENTER_MODE),               \
 175         S(DFP_TO_UFP_EXIT_MODE),                \
 176         S(DFP_TO_CABLE_PLUG_ENTER_MODE),        \
 177         S(DFP_TO_CABLE_PLUG_EXIT_MODE),         \
 178         S(ATTENTION),                           \
 179         S(BIST),                                \
 180         S(UNSTRUCTURED_VDMS),                   \
 181         S(STRUCTURED_VDMS),                     \
 182         S(COUNTRY_INFO),                        \
 183         S(COUNTRY_CODES)
 184
 185 #define GENERATE_ENUM(e)        e
 186 #define GENERATE_STRING(s)      #s
 187
 188 enum tcpm_state {
 189         FOREACH_STATE(GENERATE_ENUM)
 190 };
 191
 192 static const char * const tcpm_states[] = {
 193         FOREACH_STATE(GENERATE_STRING)
 194 };
 195
 196 enum tcpm_ams {
 197         FOREACH_AMS(GENERATE_ENUM)
 198 };
 199
 200 static const char * const tcpm_ams_str[] = {
 201         FOREACH_AMS(GENERATE_STRING)
 202 };
 203
 204 enum vdm_states {
 205         VDM_STATE_ERR_BUSY = -3,
 206         VDM_STATE_ERR_SEND = -2,
 207         VDM_STATE_ERR_TMOUT = -1,
 208         VDM_STATE_DONE = 0,
 209         /* Anything >0 represents an active state */
 210         VDM_STATE_READY = 1,
 211         VDM_STATE_BUSY = 2,
 212         VDM_STATE_WAIT_RSP_BUSY = 3,
 213         VDM_STATE_SEND_MESSAGE = 4,
 214 };
 215
 216 enum pd_msg_request {
 217         PD_MSG_NONE = 0,
 218         PD_MSG_CTRL_REJECT,
 219         PD_MSG_CTRL_WAIT,
 220         PD_MSG_CTRL_NOT_SUPP,
 221         PD_MSG_DATA_SINK_CAP,
 222         PD_MSG_DATA_SOURCE_CAP,
 223 };
 224
 225 enum adev_actions {
 226         ADEV_NONE = 0,
 227         ADEV_NOTIFY_USB_AND_QUEUE_VDM,
 228         ADEV_QUEUE_VDM,
 229         ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL,
 230         ADEV_ATTENTION,
 231 };
 232
 233 /*
 234  * Initial current capability of the new source when vSafe5V is applied during PD3.0 Fast Role Swap.
 235  * Based on "Table 6-14 Fixed Supply PDO - Sink" of "USB Power Delivery Specification Revision 3.0,
 236  * Version 1.2"
 237  */
 238 enum frs_typec_current {
 239         FRS_NOT_SUPPORTED,
 240         FRS_DEFAULT_POWER,
 241         FRS_5V_1P5A,
 242         FRS_5V_3A,
 243 };
 244
 245 /* Events from low level driver */
 246
 247 #define TCPM_CC_EVENT           BIT(0)
 248 #define TCPM_VBUS_EVENT         BIT(1)
 249 #define TCPM_RESET_EVENT        BIT(2)
 250 #define TCPM_FRS_EVENT          BIT(3)
 251 #define TCPM_SOURCING_VBUS      BIT(4)
 252
 253 #define LOG_BUFFER_ENTRIES      1024
 254 #define LOG_BUFFER_ENTRY_SIZE   128
 255
 256 /* Alternate mode support */
 257
 258 #define SVID_DISCOVERY_MAX      16
 259 #define ALTMODE_DISCOVERY_MAX   (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
 260
 261 #define GET_SINK_CAP_RETRY_MS   100
 262 #define SEND_DISCOVER_RETRY_MS  100
 263
 264 struct pd_mode_data {
 265         int svid_index;         /* current SVID index           */
 266         int nsvids;
 267         u16 svids[SVID_DISCOVERY_MAX];
 268         int altmodes;           /* number of alternate modes    */
 269         struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
 270 };
 271
 272 /*
 273  * @min_volt: Actual min voltage at the local port
 274  * @req_min_volt: Requested min voltage to the port partner
 275  * @max_volt: Actual max voltage at the local port
 276  * @req_max_volt: Requested max voltage to the port partner
 277  * @max_curr: Actual max current at the local port
 278  * @req_max_curr: Requested max current of the port partner
 279  * @req_out_volt: Requested output voltage to the port partner
 280  * @req_op_curr: Requested operating current to the port partner
 281  * @supported: Parter has atleast one APDO hence supports PPS
 282  * @active: PPS mode is active
 283  */
 284 struct pd_pps_data {
 285         u32 min_volt;
 286         u32 req_min_volt;
 287         u32 max_volt;
 288         u32 req_max_volt;
 289         u32 max_curr;
 290         u32 req_max_curr;
 291         u32 req_out_volt;
 292         u32 req_op_curr;
 293         bool supported;
 294         bool active;
 295 };
 296
 297 struct tcpm_port {
 298         struct device *dev;
 299
 300         struct mutex lock;              /* tcpm state machine lock */
 301         struct kthread_worker *wq;
 302
 303         struct typec_capability typec_caps;
 304         struct typec_port *typec_port;
 305
 306         struct tcpc_dev *tcpc;
 307         struct usb_role_switch *role_sw;
 308
 309         enum typec_role vconn_role;
 310         enum typec_role pwr_role;
 311         enum typec_data_role data_role;
 312         enum typec_pwr_opmode pwr_opmode;
 313
 314         struct usb_pd_identity partner_ident;
 315         struct typec_partner_desc partner_desc;
 316         struct typec_partner *partner;
 317
 318         enum typec_cc_status cc_req;
 319
 320         enum typec_cc_status cc1;
 321         enum typec_cc_status cc2;
 322         enum typec_cc_polarity polarity;
 323
 324         bool attached;
 325         bool connected;
 326         enum typec_port_type port_type;
 327
 328         /*
 329          * Set to true when vbus is greater than VSAFE5V min.
 330          * Set to false when vbus falls below vSinkDisconnect max threshold.
 331          */
 332         bool vbus_present;
 333
 334         /*
 335          * Set to true when vbus is less than VSAFE0V max.
 336          * Set to false when vbus is greater than VSAFE0V max.
 337          */
 338         bool vbus_vsafe0v;
 339
 340         bool vbus_never_low;
 341         bool vbus_source;
 342         bool vbus_charge;
 343
 344         bool send_discover;
 345         bool op_vsafe5v;
 346
 347         int try_role;
 348         int try_snk_count;
 349         int try_src_count;
 350
 351         enum pd_msg_request queued_message;
 352
 353         enum tcpm_state enter_state;
 354         enum tcpm_state prev_state;
 355         enum tcpm_state state;
 356         enum tcpm_state delayed_state;
 357         ktime_t delayed_runtime;
 358         unsigned long delay_ms;
 359
 360         spinlock_t pd_event_lock;
 361         u32 pd_events;
 362
 363         struct kthread_work event_work;
 364         struct hrtimer state_machine_timer;
 365         struct kthread_work state_machine;
 366         struct hrtimer vdm_state_machine_timer;
 367         struct kthread_work vdm_state_machine;
 368         struct hrtimer enable_frs_timer;
 369         struct kthread_work enable_frs;
 370         struct hrtimer send_discover_timer;
 371         struct kthread_work send_discover_work;
 372         bool state_machine_running;
 373         bool vdm_sm_running;
 374
 375         struct completion tx_complete;
 376         enum tcpm_transmit_status tx_status;
 377
 378         struct mutex swap_lock;         /* swap command lock */
 379         bool swap_pending;
 380         bool non_pd_role_swap;
 381         struct completion swap_complete;
 382         int swap_status;
 383
 384         unsigned int negotiated_rev;
 385         unsigned int message_id;
 386         unsigned int caps_count;
 387         unsigned int hard_reset_count;
 388         bool pd_capable;
 389         bool explicit_contract;
 390         unsigned int rx_msgid;
 391
 392         /* Partner capabilities/requests */
 393         u32 sink_request;
 394         u32 source_caps[PDO_MAX_OBJECTS];
 395         unsigned int nr_source_caps;
 396         u32 sink_caps[PDO_MAX_OBJECTS];
 397         unsigned int nr_sink_caps;
 398
 399         /* Local capabilities */
 400         u32 src_pdo[PDO_MAX_OBJECTS];
 401         unsigned int nr_src_pdo;
 402         u32 snk_pdo[PDO_MAX_OBJECTS];
 403         unsigned int nr_snk_pdo;
 404         u32 snk_vdo_v1[VDO_MAX_OBJECTS];
 405         unsigned int nr_snk_vdo_v1;
 406         u32 snk_vdo[VDO_MAX_OBJECTS];
 407         unsigned int nr_snk_vdo;
 408
 409         unsigned int operating_snk_mw;
 410         bool update_sink_caps;
 411
 412         /* Requested current / voltage to the port partner */
 413         u32 req_current_limit;
 414         u32 req_supply_voltage;
 415         /* Actual current / voltage limit of the local port */
 416         u32 current_limit;
 417         u32 supply_voltage;
 418
 419         /* Used to export TA voltage and current */
 420         struct power_supply *psy;
 421         struct power_supply_desc psy_desc;
 422         enum power_supply_usb_type usb_type;
 423
 424         u32 bist_request;
 425
 426         /* PD state for Vendor Defined Messages */
 427         enum vdm_states vdm_state;
 428         u32 vdm_retries;
 429         /* next Vendor Defined Message to send */
 430         u32 vdo_data[VDO_MAX_SIZE];
 431         u8 vdo_count;
 432         /* VDO to retry if UFP responder replied busy */
 433         u32 vdo_retry;
 434
 435         /* PPS */
 436         struct pd_pps_data pps_data;
 437         struct completion pps_complete;
 438         bool pps_pending;
 439         int pps_status;
 440
 441         /* Alternate mode data */
 442         struct pd_mode_data mode_data;
 443         struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
 444         struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
 445
 446         /* Deadline in jiffies to exit src_try_wait state */
 447         unsigned long max_wait;
 448
 449         /* port belongs to a self powered device */
 450         bool self_powered;
 451
 452         /* Sink FRS */
 453         enum frs_typec_current new_source_frs_current;
 454
 455         /* Sink caps have been queried */
 456         bool sink_cap_done;
 457
 458         /* Collision Avoidance and Atomic Message Sequence */
 459         enum tcpm_state upcoming_state;
 460         enum tcpm_ams ams;
 461         enum tcpm_ams next_ams;
 462         bool in_ams;
 463
 464         /* Auto vbus discharge status */
 465         bool auto_vbus_discharge_enabled;
 466
 467         /*
 468          * When set, port requests PD_P_SNK_STDBY_MW upon entering SNK_DISCOVERY and
 469          * the actual currrent limit after RX of PD_CTRL_PSRDY for PD link,
 470          * SNK_READY for non-pd link.
 471          */
 472         bool slow_charger_loop;
 473 #ifdef CONFIG_DEBUG_FS
 474         struct dentry *dentry;
 475         struct mutex logbuffer_lock;    /* log buffer access lock */
 476         int logbuffer_head;
 477         int logbuffer_tail;
 478         u8 *logbuffer[LOG_BUFFER_ENTRIES];
 479 #endif
 480 };
 481
 482 struct pd_rx_event {
 483         struct kthread_work work;
 484         struct tcpm_port *port;
 485         struct pd_message msg;
 486 };
 487
 488 static const char * const pd_rev[] = {
 489         [PD_REV10]              = "rev1",
 490         [PD_REV20]              = "rev2",
 491         [PD_REV30]              = "rev3",
 492 };
 493
 494 #define tcpm_cc_is_sink(cc) \
 495         ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
 496          (cc) == TYPEC_CC_RP_3_0)
 497
 498 #define tcpm_port_is_sink(port) \
 499         ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
 500          (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
 501
 502 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
 503 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
 504 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
 505
 506 #define tcpm_port_is_source(port) \
 507         ((tcpm_cc_is_source((port)->cc1) && \
 508          !tcpm_cc_is_source((port)->cc2)) || \
 509          (tcpm_cc_is_source((port)->cc2) && \
 510           !tcpm_cc_is_source((port)->cc1)))
 511
 512 #define tcpm_port_is_debug(port) \
 513         (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
 514
 515 #define tcpm_port_is_audio(port) \
 516         (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
 517
 518 #define tcpm_port_is_audio_detached(port) \
 519         ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
 520          (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
 521
 522 #define tcpm_try_snk(port) \
 523         ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
 524         (port)->port_type == TYPEC_PORT_DRP)
 525
 526 #define tcpm_try_src(port) \
 527         ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
 528         (port)->port_type == TYPEC_PORT_DRP)
 529
 530 #define tcpm_data_role_for_source(port) \
 531         ((port)->typec_caps.data == TYPEC_PORT_UFP ? \
 532         TYPEC_DEVICE : TYPEC_HOST)
 533
 534 #define tcpm_data_role_for_sink(port) \
 535         ((port)->typec_caps.data == TYPEC_PORT_DFP ? \
 536         TYPEC_HOST : TYPEC_DEVICE)
 537
 538 #define tcpm_sink_tx_ok(port) \
 539         (tcpm_port_is_sink(port) && \
 540         ((port)->cc1 == TYPEC_CC_RP_3_0 || (port)->cc2 == TYPEC_CC_RP_3_0))
 541
 542 #define tcpm_wait_for_discharge(port) \
 543         (((port)->auto_vbus_discharge_enabled && !(port)->vbus_vsafe0v) ? PD_T_SAFE_0V : 0)
 544
 545 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
 546 {
 547         if (port->port_type == TYPEC_PORT_DRP) {
 548                 if (port->try_role == TYPEC_SINK)
 549                         return SNK_UNATTACHED;
 550                 else if (port->try_role == TYPEC_SOURCE)
 551                         return SRC_UNATTACHED;
 552                 /* Fall through to return SRC_UNATTACHED */
 553         } else if (port->port_type == TYPEC_PORT_SNK) {
 554                 return SNK_UNATTACHED;
 555         }
 556         return SRC_UNATTACHED;
 557 }
 558
 559 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
 560 {
 561         return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
 562                 port->cc2 == TYPEC_CC_OPEN) ||
 563                (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
 564                                     port->cc1 == TYPEC_CC_OPEN) ||
 565                                    (port->polarity == TYPEC_POLARITY_CC2 &&
 566                                     port->cc2 == TYPEC_CC_OPEN)));
 567 }
 568
 569 /*
 570  * Logging
 571  */
 572
 573 #ifdef CONFIG_DEBUG_FS
 574
 575 static bool tcpm_log_full(struct tcpm_port *port)
 576 {
 577         return port->logbuffer_tail ==
 578                 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 579 }
 580
 581 __printf(2, 0)
 582 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
 583 {
 584         char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
 585         u64 ts_nsec = local_clock();
 586         unsigned long rem_nsec;
 587
 588         mutex_lock(&port->logbuffer_lock);
 589         if (!port->logbuffer[port->logbuffer_head]) {
 590                 port->logbuffer[port->logbuffer_head] =
 591                                 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
 592                 if (!port->logbuffer[port->logbuffer_head]) {
 593                         mutex_unlock(&port->logbuffer_lock);
 594                         return;
 595                 }
 596         }
 597
 598         vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
 599
 600         if (tcpm_log_full(port)) {
 601                 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
 602                 strcpy(tmpbuffer, "overflow");
 603         }
 604
 605         if (port->logbuffer_head < 0 ||
 606             port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
 607                 dev_warn(port->dev,
 608                          "Bad log buffer index %d\n", port->logbuffer_head);
 609                 goto abort;
 610         }
 611
 612         if (!port->logbuffer[port->logbuffer_head]) {
 613                 dev_warn(port->dev,
 614                          "Log buffer index %d is NULL\n", port->logbuffer_head);
 615                 goto abort;
 616         }
 617
 618         rem_nsec = do_div(ts_nsec, 1000000000);
 619         scnprintf(port->logbuffer[port->logbuffer_head],
 620                   LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
 621                   (unsigned long)ts_nsec, rem_nsec / 1000,
 622                   tmpbuffer);
 623         port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 624
 625 abort:
 626         mutex_unlock(&port->logbuffer_lock);
 627 }
 628
 629 __printf(2, 3)
 630 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
 631 {
 632         va_list args;
 633
 634         /* Do not log while disconnected and unattached */
 635         if (tcpm_port_is_disconnected(port) &&
 636             (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
 637              port->state == TOGGLING))
 638                 return;
 639
 640         va_start(args, fmt);
 641         _tcpm_log(port, fmt, args);
 642         va_end(args);
 643 }
 644
 645 __printf(2, 3)
 646 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
 647 {
 648         va_list args;
 649
 650         va_start(args, fmt);
 651         _tcpm_log(port, fmt, args);
 652         va_end(args);
 653 }
 654
 655 static void tcpm_log_source_caps(struct tcpm_port *port)
 656 {
 657         int i;
 658
 659         for (i = 0; i < port->nr_source_caps; i++) {
 660                 u32 pdo = port->source_caps[i];
 661                 enum pd_pdo_type type = pdo_type(pdo);
 662                 char msg[64];
 663
 664                 switch (type) {
 665                 case PDO_TYPE_FIXED:
 666                         scnprintf(msg, sizeof(msg),
 667                                   "%u mV, %u mA [%s%s%s%s%s%s]",
 668                                   pdo_fixed_voltage(pdo),
 669                                   pdo_max_current(pdo),
 670                                   (pdo & PDO_FIXED_DUAL_ROLE) ?
 671                                                         "R" : "",
 672                                   (pdo & PDO_FIXED_SUSPEND) ?
 673                                                         "S" : "",
 674                                   (pdo & PDO_FIXED_HIGHER_CAP) ?
 675                                                         "H" : "",
 676                                   (pdo & PDO_FIXED_USB_COMM) ?
 677                                                         "U" : "",
 678                                   (pdo & PDO_FIXED_DATA_SWAP) ?
 679                                                         "D" : "",
 680                                   (pdo & PDO_FIXED_EXTPOWER) ?
 681                                                         "E" : "");
 682                         break;
 683                 case PDO_TYPE_VAR:
 684                         scnprintf(msg, sizeof(msg),
 685                                   "%u-%u mV, %u mA",
 686                                   pdo_min_voltage(pdo),
 687                                   pdo_max_voltage(pdo),
 688                                   pdo_max_current(pdo));
 689                         break;
 690                 case PDO_TYPE_BATT:
 691                         scnprintf(msg, sizeof(msg),
 692                                   "%u-%u mV, %u mW",
 693                                   pdo_min_voltage(pdo),
 694                                   pdo_max_voltage(pdo),
 695                                   pdo_max_power(pdo));
 696                         break;
 697                 case PDO_TYPE_APDO:
 698                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
 699                                 scnprintf(msg, sizeof(msg),
 700                                           "%u-%u mV, %u mA",
 701                                           pdo_pps_apdo_min_voltage(pdo),
 702                                           pdo_pps_apdo_max_voltage(pdo),
 703                                           pdo_pps_apdo_max_current(pdo));
 704                         else
 705                                 strcpy(msg, "undefined APDO");
 706                         break;
 707                 default:
 708                         strcpy(msg, "undefined");
 709                         break;
 710                 }
 711                 tcpm_log(port, " PDO %d: type %d, %s",
 712                          i, type, msg);
 713         }
 714 }
 715
 716 static int tcpm_debug_show(struct seq_file *s, void *v)
 717 {
 718         struct tcpm_port *port = (struct tcpm_port *)s->private;
 719         int tail;
 720
 721         mutex_lock(&port->logbuffer_lock);
 722         tail = port->logbuffer_tail;
 723         while (tail != port->logbuffer_head) {
 724                 seq_printf(s, "%s\n", port->logbuffer[tail]);
 725                 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
 726         }
 727         if (!seq_has_overflowed(s))
 728                 port->logbuffer_tail = tail;
 729         mutex_unlock(&port->logbuffer_lock);
 730
 731         return 0;
 732 }
 733 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
 734
 735 static void tcpm_debugfs_init(struct tcpm_port *port)
 736 {
 737         char name[NAME_MAX];
 738
 739         mutex_init(&port->logbuffer_lock);
 740         snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
 741         port->dentry = debugfs_create_dir(name, usb_debug_root);
 742         debugfs_create_file("log", S_IFREG | 0444, port->dentry, port,
 743                             &tcpm_debug_fops);
 744 }
 745
 746 static void tcpm_debugfs_exit(struct tcpm_port *port)
 747 {
 748         int i;
 749
 750         mutex_lock(&port->logbuffer_lock);
 751         for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
 752                 kfree(port->logbuffer[i]);
 753                 port->logbuffer[i] = NULL;
 754         }
 755         mutex_unlock(&port->logbuffer_lock);
 756
 757         debugfs_remove(port->dentry);
 758 }
 759
 760 #else
 761
 762 __printf(2, 3)
 763 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
 764 __printf(2, 3)
 765 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
 766 static void tcpm_log_source_caps(struct tcpm_port *port) { }
 767 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
 768 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
 769
 770 #endif
 771
 772 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
 773 {
 774         tcpm_log(port, "cc:=%d", cc);
 775         port->cc_req = cc;
 776         port->tcpc->set_cc(port->tcpc, cc);
 777 }
 778
 779 static int tcpm_enable_auto_vbus_discharge(struct tcpm_port *port, bool enable)
 780 {
 781         int ret = 0;
 782
 783         if (port->tcpc->enable_auto_vbus_discharge) {
 784                 ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, enable);
 785                 tcpm_log_force(port, "%s vbus discharge ret:%d", enable ? "enable" : "disable",
 786                                ret);
 787                 if (!ret)
 788                         port->auto_vbus_discharge_enabled = enable;
 789         }
 790
 791         return ret;
 792 }
 793
 794 static void tcpm_apply_rc(struct tcpm_port *port)
 795 {
 796         /*
 797          * TCPCI: Move to APPLY_RC state to prevent disconnect during PR_SWAP
 798          * when Vbus auto discharge on disconnect is enabled.
 799          */
 800         if (port->tcpc->enable_auto_vbus_discharge && port->tcpc->apply_rc) {
 801                 tcpm_log(port, "Apply_RC");
 802                 port->tcpc->apply_rc(port->tcpc, port->cc_req, port->polarity);
 803                 tcpm_enable_auto_vbus_discharge(port, false);
 804         }
 805 }
 806
 807 /*
 808  * Determine RP value to set based on maximum current supported
 809  * by a port if configured as source.
 810  * Returns CC value to report to link partner.
 811  */
 812 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
 813 {
 814         const u32 *src_pdo = port->src_pdo;
 815         int nr_pdo = port->nr_src_pdo;
 816         int i;
 817
 818         /*
 819          * Search for first entry with matching voltage.
 820          * It should report the maximum supported current.
 821          */
 822         for (i = 0; i < nr_pdo; i++) {
 823                 const u32 pdo = src_pdo[i];
 824
 825                 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
 826                     pdo_fixed_voltage(pdo) == 5000) {
 827                         unsigned int curr = pdo_max_current(pdo);
 828
 829                         if (curr >= 3000)
 830                                 return TYPEC_CC_RP_3_0;
 831                         else if (curr >= 1500)
 832                                 return TYPEC_CC_RP_1_5;
 833                         return TYPEC_CC_RP_DEF;
 834                 }
 835         }
 836
 837         return TYPEC_CC_RP_DEF;
 838 }
 839
 840 static void tcpm_ams_finish(struct tcpm_port *port)
 841 {
 842         tcpm_log(port, "AMS %s finished", tcpm_ams_str[port->ams]);
 843
 844         if (port->pd_capable && port->pwr_role == TYPEC_SOURCE) {
 845                 if (port->negotiated_rev >= PD_REV30)
 846                         tcpm_set_cc(port, SINK_TX_OK);
 847                 else
 848                         tcpm_set_cc(port, SINK_TX_NG);
 849         } else if (port->pwr_role == TYPEC_SOURCE) {
 850                 tcpm_set_cc(port, tcpm_rp_cc(port));
 851         }
 852
 853         port->in_ams = false;
 854         port->ams = NONE_AMS;
 855 }
 856
 857 static int tcpm_pd_transmit(struct tcpm_port *port,
 858                             enum tcpm_transmit_type type,
 859                             const struct pd_message *msg)
 860 {
 861         unsigned long timeout;
 862         int ret;
 863
 864         if (msg)
 865                 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
 866         else
 867                 tcpm_log(port, "PD TX, type: %#x", type);
 868
 869         reinit_completion(&port->tx_complete);
 870         ret = port->tcpc->pd_transmit(port->tcpc, type, msg, port->negotiated_rev);
 871         if (ret < 0)
 872                 return ret;
 873
 874         mutex_unlock(&port->lock);
 875         timeout = wait_for_completion_timeout(&port->tx_complete,
 876                                 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
 877         mutex_lock(&port->lock);
 878         if (!timeout)
 879                 return -ETIMEDOUT;
 880
 881         switch (port->tx_status) {
 882         case TCPC_TX_SUCCESS:
 883                 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
 884                 /*
 885                  * USB PD rev 2.0, 8.3.2.2.1:
 886                  * USB PD rev 3.0, 8.3.2.1.3:
 887                  * "... Note that every AMS is Interruptible until the first
 888                  * Message in the sequence has been successfully sent (GoodCRC
 889                  * Message received)."
 890                  */
 891                 if (port->ams != NONE_AMS)
 892                         port->in_ams = true;
 893                 break;
 894         case TCPC_TX_DISCARDED:
 895                 ret = -EAGAIN;
 896                 break;
 897         case TCPC_TX_FAILED:
 898         default:
 899                 ret = -EIO;
 900                 break;
 901         }
 902
 903         /* Some AMS don't expect responses. Finish them here. */
 904         if (port->ams == ATTENTION || port->ams == SOURCE_ALERT)
 905                 tcpm_ams_finish(port);
 906
 907         return ret;
 908 }
 909
 910 void tcpm_pd_transmit_complete(struct tcpm_port *port,
 911                                enum tcpm_transmit_status status)
 912 {
 913         tcpm_log(port, "PD TX complete, status: %u", status);
 914         port->tx_status = status;
 915         complete(&port->tx_complete);
 916 }
 917 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
 918
 919 static int tcpm_mux_set(struct tcpm_port *port, int state,
 920                         enum usb_role usb_role,
 921                         enum typec_orientation orientation)
 922 {
 923         int ret;
 924
 925         tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
 926                  state, usb_role, orientation);
 927
 928         ret = typec_set_orientation(port->typec_port, orientation);
 929         if (ret)
 930                 return ret;
 931
 932         if (port->role_sw) {
 933                 ret = usb_role_switch_set_role(port->role_sw, usb_role);
 934                 if (ret)
 935                         return ret;
 936         }
 937
 938         return typec_set_mode(port->typec_port, state);
 939 }
 940
 941 static int tcpm_set_polarity(struct tcpm_port *port,
 942                              enum typec_cc_polarity polarity)
 943 {
 944         int ret;
 945
 946         tcpm_log(port, "polarity %d", polarity);
 947
 948         ret = port->tcpc->set_polarity(port->tcpc, polarity);
 949         if (ret < 0)
 950                 return ret;
 951
 952         port->polarity = polarity;
 953
 954         return 0;
 955 }
 956
 957 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
 958 {
 959         int ret;
 960
 961         tcpm_log(port, "vconn:=%d", enable);
 962
 963         ret = port->tcpc->set_vconn(port->tcpc, enable);
 964         if (!ret) {
 965                 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
 966                 typec_set_vconn_role(port->typec_port, port->vconn_role);
 967         }
 968
 969         return ret;
 970 }
 971
 972 static u32 tcpm_get_current_limit(struct tcpm_port *port)
 973 {
 974         enum typec_cc_status cc;
 975         u32 limit;
 976
 977         cc = port->polarity ? port->cc2 : port->cc1;
 978         switch (cc) {
 979         case TYPEC_CC_RP_1_5:
 980                 limit = 1500;
 981                 break;
 982         case TYPEC_CC_RP_3_0:
 983                 limit = 3000;
 984                 break;
 985         case TYPEC_CC_RP_DEF:
 986         default:
 987                 if (port->tcpc->get_current_limit)
 988                         limit = port->tcpc->get_current_limit(port->tcpc);
 989                 else
 990                         limit = 0;
 991                 break;
 992         }
 993
 994         return limit;
 995 }
 996
 997 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
 998 {
 999         int ret = -EOPNOTSUPP;
1000
1001         tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
1002
1003         port->supply_voltage = mv;
1004         port->current_limit = max_ma;
1005         power_supply_changed(port->psy);
1006
1007         if (port->tcpc->set_current_limit)
1008                 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
1009
1010         return ret;
1011 }
1012
1013 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
1014 {
1015         return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
1016                                      port->data_role);
1017 }
1018
1019 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
1020                           enum typec_role role, enum typec_data_role data)
1021 {
1022         enum typec_orientation orientation;
1023         enum usb_role usb_role;
1024         int ret;
1025
1026         if (port->polarity == TYPEC_POLARITY_CC1)
1027                 orientation = TYPEC_ORIENTATION_NORMAL;
1028         else
1029                 orientation = TYPEC_ORIENTATION_REVERSE;
1030
1031         if (port->typec_caps.data == TYPEC_PORT_DRD) {
1032                 if (data == TYPEC_HOST)
1033                         usb_role = USB_ROLE_HOST;
1034                 else
1035                         usb_role = USB_ROLE_DEVICE;
1036         } else if (port->typec_caps.data == TYPEC_PORT_DFP) {
1037                 if (data == TYPEC_HOST) {
1038                         if (role == TYPEC_SOURCE)
1039                                 usb_role = USB_ROLE_HOST;
1040                         else
1041                                 usb_role = USB_ROLE_NONE;
1042                 } else {
1043                         return -ENOTSUPP;
1044                 }
1045         } else {
1046                 if (data == TYPEC_DEVICE) {
1047                         if (role == TYPEC_SINK)
1048                                 usb_role = USB_ROLE_DEVICE;
1049                         else
1050                                 usb_role = USB_ROLE_NONE;
1051                 } else {
1052                         return -ENOTSUPP;
1053                 }
1054         }
1055
1056         ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
1057         if (ret < 0)
1058                 return ret;
1059
1060         ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
1061         if (ret < 0)
1062                 return ret;
1063
1064         port->pwr_role = role;
1065         port->data_role = data;
1066         typec_set_data_role(port->typec_port, data);
1067         typec_set_pwr_role(port->typec_port, role);
1068
1069         return 0;
1070 }
1071
1072 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
1073 {
1074         int ret;
1075
1076         ret = port->tcpc->set_roles(port->tcpc, true, role,
1077                                     port->data_role);
1078         if (ret < 0)
1079                 return ret;
1080
1081         port->pwr_role = role;
1082         typec_set_pwr_role(port->typec_port, role);
1083
1084         return 0;
1085 }
1086
1087 /*
1088  * Transform the PDO to be compliant to PD rev2.0.
1089  * Return 0 if the PDO type is not defined in PD rev2.0.
1090  * Otherwise, return the converted PDO.
1091  */
1092 static u32 tcpm_forge_legacy_pdo(struct tcpm_port *port, u32 pdo, enum typec_role role)
1093 {
1094         switch (pdo_type(pdo)) {
1095         case PDO_TYPE_FIXED:
1096                 if (role == TYPEC_SINK)
1097                         return pdo & ~PDO_FIXED_FRS_CURR_MASK;
1098                 else
1099                         return pdo & ~PDO_FIXED_UNCHUNK_EXT;
1100         case PDO_TYPE_VAR:
1101         case PDO_TYPE_BATT:
1102                 return pdo;
1103         case PDO_TYPE_APDO:
1104         default:
1105                 return 0;
1106         }
1107 }
1108
1109 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
1110 {
1111         struct pd_message msg;
1112         u32 pdo;
1113         unsigned int i, nr_pdo = 0;
1114
1115         memset(&msg, 0, sizeof(msg));
1116
1117         for (i = 0; i < port->nr_src_pdo; i++) {
1118                 if (port->negotiated_rev >= PD_REV30) {
1119                         msg.payload[nr_pdo++] = cpu_to_le32(port->src_pdo[i]);
1120                 } else {
1121                         pdo = tcpm_forge_legacy_pdo(port, port->src_pdo[i], TYPEC_SOURCE);
1122                         if (pdo)
1123                                 msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1124                 }
1125         }
1126
1127         if (!nr_pdo) {
1128                 /* No source capabilities defined, sink only */
1129                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1130                                           port->pwr_role,
1131                                           port->data_role,
1132                                           port->negotiated_rev,
1133                                           port->message_id, 0);
1134         } else {
1135                 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
1136                                           port->pwr_role,
1137                                           port->data_role,
1138                                           port->negotiated_rev,
1139                                           port->message_id,
1140                                           nr_pdo);
1141         }
1142
1143         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1144 }
1145
1146 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
1147 {
1148         struct pd_message msg;
1149         u32 pdo;
1150         unsigned int i, nr_pdo = 0;
1151
1152         memset(&msg, 0, sizeof(msg));
1153
1154         for (i = 0; i < port->nr_snk_pdo; i++) {
1155                 if (port->negotiated_rev >= PD_REV30) {
1156                         msg.payload[nr_pdo++] = cpu_to_le32(port->snk_pdo[i]);
1157                 } else {
1158                         pdo = tcpm_forge_legacy_pdo(port, port->snk_pdo[i], TYPEC_SINK);
1159                         if (pdo)
1160                                 msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1161                 }
1162         }
1163
1164         if (!nr_pdo) {
1165                 /* No sink capabilities defined, source only */
1166                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1167                                           port->pwr_role,
1168                                           port->data_role,
1169                                           port->negotiated_rev,
1170                                           port->message_id, 0);
1171         } else {
1172                 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
1173                                           port->pwr_role,
1174                                           port->data_role,
1175                                           port->negotiated_rev,
1176                                           port->message_id,
1177                                           nr_pdo);
1178         }
1179
1180         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1181 }
1182
1183 static void mod_tcpm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1184 {
1185         if (delay_ms) {
1186                 hrtimer_start(&port->state_machine_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1187         } else {
1188                 hrtimer_cancel(&port->state_machine_timer);
1189                 kthread_queue_work(port->wq, &port->state_machine);
1190         }
1191 }
1192
1193 static void mod_vdm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1194 {
1195         if (delay_ms) {
1196                 hrtimer_start(&port->vdm_state_machine_timer, ms_to_ktime(delay_ms),
1197                               HRTIMER_MODE_REL);
1198         } else {
1199                 hrtimer_cancel(&port->vdm_state_machine_timer);
1200                 kthread_queue_work(port->wq, &port->vdm_state_machine);
1201         }
1202 }
1203
1204 static void mod_enable_frs_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1205 {
1206         if (delay_ms) {
1207                 hrtimer_start(&port->enable_frs_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1208         } else {
1209                 hrtimer_cancel(&port->enable_frs_timer);
1210                 kthread_queue_work(port->wq, &port->enable_frs);
1211         }
1212 }
1213
1214 static void mod_send_discover_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1215 {
1216         if (delay_ms) {
1217                 hrtimer_start(&port->send_discover_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1218         } else {
1219                 hrtimer_cancel(&port->send_discover_timer);
1220                 kthread_queue_work(port->wq, &port->send_discover_work);
1221         }
1222 }
1223
1224 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
1225                            unsigned int delay_ms)
1226 {
1227         if (delay_ms) {
1228                 tcpm_log(port, "pending state change %s -> %s @ %u ms [%s %s]",
1229                          tcpm_states[port->state], tcpm_states[state], delay_ms,
1230                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1231                 port->delayed_state = state;
1232                 mod_tcpm_delayed_work(port, delay_ms);
1233                 port->delayed_runtime = ktime_add(ktime_get(), ms_to_ktime(delay_ms));
1234                 port->delay_ms = delay_ms;
1235         } else {
1236                 tcpm_log(port, "state change %s -> %s [%s %s]",
1237                          tcpm_states[port->state], tcpm_states[state],
1238                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1239                 port->delayed_state = INVALID_STATE;
1240                 port->prev_state = port->state;
1241                 port->state = state;
1242                 /*
1243                  * Don't re-queue the state machine work item if we're currently
1244                  * in the state machine and we're immediately changing states.
1245                  * tcpm_state_machine_work() will continue running the state
1246                  * machine.
1247                  */
1248                 if (!port->state_machine_running)
1249                         mod_tcpm_delayed_work(port, 0);
1250         }
1251 }
1252
1253 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
1254                                 unsigned int delay_ms)
1255 {
1256         if (port->enter_state == port->state)
1257                 tcpm_set_state(port, state, delay_ms);
1258         else
1259                 tcpm_log(port,
1260                          "skipped %sstate change %s -> %s [%u ms], context state %s [%s %s]",
1261                          delay_ms ? "delayed " : "",
1262                          tcpm_states[port->state], tcpm_states[state],
1263                          delay_ms, tcpm_states[port->enter_state],
1264                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1265 }
1266
1267 static void tcpm_queue_message(struct tcpm_port *port,
1268                                enum pd_msg_request message)
1269 {
1270         port->queued_message = message;
1271         mod_tcpm_delayed_work(port, 0);
1272 }
1273
1274 static bool tcpm_vdm_ams(struct tcpm_port *port)
1275 {
1276         switch (port->ams) {
1277         case DISCOVER_IDENTITY:
1278         case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1279         case DISCOVER_SVIDS:
1280         case DISCOVER_MODES:
1281         case DFP_TO_UFP_ENTER_MODE:
1282         case DFP_TO_UFP_EXIT_MODE:
1283         case DFP_TO_CABLE_PLUG_ENTER_MODE:
1284         case DFP_TO_CABLE_PLUG_EXIT_MODE:
1285         case ATTENTION:
1286         case UNSTRUCTURED_VDMS:
1287         case STRUCTURED_VDMS:
1288                 break;
1289         default:
1290                 return false;
1291         }
1292
1293         return true;
1294 }
1295
1296 static bool tcpm_ams_interruptible(struct tcpm_port *port)
1297 {
1298         switch (port->ams) {
1299         /* Interruptible AMS */
1300         case NONE_AMS:
1301         case SECURITY:
1302         case FIRMWARE_UPDATE:
1303         case DISCOVER_IDENTITY:
1304         case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1305         case DISCOVER_SVIDS:
1306         case DISCOVER_MODES:
1307         case DFP_TO_UFP_ENTER_MODE:
1308         case DFP_TO_UFP_EXIT_MODE:
1309         case DFP_TO_CABLE_PLUG_ENTER_MODE:
1310         case DFP_TO_CABLE_PLUG_EXIT_MODE:
1311         case UNSTRUCTURED_VDMS:
1312         case STRUCTURED_VDMS:
1313         case COUNTRY_INFO:
1314         case COUNTRY_CODES:
1315                 break;
1316         /* Non-Interruptible AMS */
1317         default:
1318                 if (port->in_ams)
1319                         return false;
1320                 break;
1321         }
1322
1323         return true;
1324 }
1325
1326 static int tcpm_ams_start(struct tcpm_port *port, enum tcpm_ams ams)
1327 {
1328         int ret = 0;
1329
1330         tcpm_log(port, "AMS %s start", tcpm_ams_str[ams]);
1331
1332         if (!tcpm_ams_interruptible(port) &&
1333             !(ams == HARD_RESET || ams == SOFT_RESET_AMS)) {
1334                 port->upcoming_state = INVALID_STATE;
1335                 tcpm_log(port, "AMS %s not interruptible, aborting",
1336                          tcpm_ams_str[port->ams]);
1337                 return -EAGAIN;
1338         }
1339
1340         if (port->pwr_role == TYPEC_SOURCE) {
1341                 enum typec_cc_status cc_req = port->cc_req;
1342
1343                 port->ams = ams;
1344
1345                 if (ams == HARD_RESET) {
1346                         tcpm_set_cc(port, tcpm_rp_cc(port));
1347                         tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1348                         tcpm_set_state(port, HARD_RESET_START, 0);
1349                         return ret;
1350                 } else if (ams == SOFT_RESET_AMS) {
1351                         if (!port->explicit_contract)
1352                                 tcpm_set_cc(port, tcpm_rp_cc(port));
1353                         tcpm_set_state(port, SOFT_RESET_SEND, 0);
1354                         return ret;
1355                 } else if (tcpm_vdm_ams(port)) {
1356                         /* tSinkTx is enforced in vdm_run_state_machine */
1357                         if (port->negotiated_rev >= PD_REV30)
1358                                 tcpm_set_cc(port, SINK_TX_NG);
1359                         return ret;
1360                 }
1361
1362                 if (port->negotiated_rev >= PD_REV30)
1363                         tcpm_set_cc(port, SINK_TX_NG);
1364
1365                 switch (port->state) {
1366                 case SRC_READY:
1367                 case SRC_STARTUP:
1368                 case SRC_SOFT_RESET_WAIT_SNK_TX:
1369                 case SOFT_RESET:
1370                 case SOFT_RESET_SEND:
1371                         if (port->negotiated_rev >= PD_REV30)
1372                                 tcpm_set_state(port, AMS_START,
1373                                                cc_req == SINK_TX_OK ?
1374                                                PD_T_SINK_TX : 0);
1375                         else
1376                                 tcpm_set_state(port, AMS_START, 0);
1377                         break;
1378                 default:
1379                         if (port->negotiated_rev >= PD_REV30)
1380                                 tcpm_set_state(port, SRC_READY,
1381                                                cc_req == SINK_TX_OK ?
1382                                                PD_T_SINK_TX : 0);
1383                         else
1384                                 tcpm_set_state(port, SRC_READY, 0);
1385                         break;
1386                 }
1387         } else {
1388                 if (port->negotiated_rev >= PD_REV30 &&
1389                     !tcpm_sink_tx_ok(port) &&
1390                     ams != SOFT_RESET_AMS &&
1391                     ams != HARD_RESET) {
1392                         port->upcoming_state = INVALID_STATE;
1393                         tcpm_log(port, "Sink TX No Go");
1394                         return -EAGAIN;
1395                 }
1396
1397                 port->ams = ams;
1398
1399                 if (ams == HARD_RESET) {
1400                         tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1401                         tcpm_set_state(port, HARD_RESET_START, 0);
1402                         return ret;
1403                 } else if (tcpm_vdm_ams(port)) {
1404                         return ret;
1405                 }
1406
1407                 if (port->state == SNK_READY ||
1408                     port->state == SNK_SOFT_RESET)
1409                         tcpm_set_state(port, AMS_START, 0);
1410                 else
1411                         tcpm_set_state(port, SNK_READY, 0);
1412         }
1413
1414         return ret;
1415 }
1416
1417 /*
1418  * VDM/VDO handling functions
1419  */
1420 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
1421                            const u32 *data, int cnt)
1422 {
1423         WARN_ON(!mutex_is_locked(&port->lock));
1424
1425         /* Make sure we are not still processing a previous VDM packet */
1426         WARN_ON(port->vdm_state > VDM_STATE_DONE);
1427
1428         port->vdo_count = cnt + 1;
1429         port->vdo_data[0] = header;
1430         memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
1431         /* Set ready, vdm state machine will actually send */
1432         port->vdm_retries = 0;
1433         port->vdm_state = VDM_STATE_READY;
1434
1435         mod_vdm_delayed_work(port, 0);
1436 }
1437
1438 static void tcpm_queue_vdm_unlocked(struct tcpm_port *port, const u32 header,
1439                                     const u32 *data, int cnt)
1440 {
1441         mutex_lock(&port->lock);
1442         tcpm_queue_vdm(port, header, data, cnt);
1443         mutex_unlock(&port->lock);
1444 }
1445
1446 static void svdm_consume_identity(struct tcpm_port *port, const u32 *p, int cnt)
1447 {
1448         u32 vdo = p[VDO_INDEX_IDH];
1449         u32 product = p[VDO_INDEX_PRODUCT];
1450
1451         memset(&port->mode_data, 0, sizeof(port->mode_data));
1452
1453         port->partner_ident.id_header = vdo;
1454         port->partner_ident.cert_stat = p[VDO_INDEX_CSTAT];
1455         port->partner_ident.product = product;
1456
1457         typec_partner_set_identity(port->partner);
1458
1459         tcpm_log(port, "Identity: %04x:%04x.%04x",
1460                  PD_IDH_VID(vdo),
1461                  PD_PRODUCT_PID(product), product & 0xffff);
1462 }
1463
1464 static bool svdm_consume_svids(struct tcpm_port *port, const u32 *p, int cnt)
1465 {
1466         struct pd_mode_data *pmdata = &port->mode_data;
1467         int i;
1468
1469         for (i = 1; i < cnt; i++) {
1470                 u16 svid;
1471
1472                 svid = (p[i] >> 16) & 0xffff;
1473                 if (!svid)
1474                         return false;
1475
1476                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1477                         goto abort;
1478
1479                 pmdata->svids[pmdata->nsvids++] = svid;
1480                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1481
1482                 svid = p[i] & 0xffff;
1483                 if (!svid)
1484                         return false;
1485
1486                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1487                         goto abort;
1488
1489                 pmdata->svids[pmdata->nsvids++] = svid;
1490                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1491         }
1492         return true;
1493 abort:
1494         tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1495         return false;
1496 }
1497
1498 static void svdm_consume_modes(struct tcpm_port *port, const u32 *p, int cnt)
1499 {
1500         struct pd_mode_data *pmdata = &port->mode_data;
1501         struct typec_altmode_desc *paltmode;
1502         int i;
1503
1504         if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1505                 /* Already logged in svdm_consume_svids() */
1506                 return;
1507         }
1508
1509         for (i = 1; i < cnt; i++) {
1510                 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1511                 memset(paltmode, 0, sizeof(*paltmode));
1512
1513                 paltmode->svid = pmdata->svids[pmdata->svid_index];
1514                 paltmode->mode = i;
1515                 paltmode->vdo = p[i];
1516
1517                 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1518                          pmdata->altmodes, paltmode->svid,
1519                          paltmode->mode, paltmode->vdo);
1520
1521                 pmdata->altmodes++;
1522         }
1523 }
1524
1525 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1526 {
1527         struct pd_mode_data *modep = &port->mode_data;
1528         struct typec_altmode *altmode;
1529         int i;
1530
1531         for (i = 0; i < modep->altmodes; i++) {
1532                 altmode = typec_partner_register_altmode(port->partner,
1533                                                 &modep->altmode_desc[i]);
1534                 if (IS_ERR(altmode)) {
1535                         tcpm_log(port, "Failed to register partner SVID 0x%04x",
1536                                  modep->altmode_desc[i].svid);
1537                         altmode = NULL;
1538                 }
1539                 port->partner_altmode[i] = altmode;
1540         }
1541 }
1542
1543 #define supports_modal(port)    PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1544
1545 static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
1546                         const u32 *p, int cnt, u32 *response,
1547                         enum adev_actions *adev_action)
1548 {
1549         struct typec_port *typec = port->typec_port;
1550         struct typec_altmode *pdev;
1551         struct pd_mode_data *modep;
1552         int svdm_version;
1553         int rlen = 0;
1554         int cmd_type;
1555         int cmd;
1556         int i;
1557
1558         cmd_type = PD_VDO_CMDT(p[0]);
1559         cmd = PD_VDO_CMD(p[0]);
1560
1561         tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1562                  p[0], cmd_type, cmd, cnt);
1563
1564         modep = &port->mode_data;
1565
1566         pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1567                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1568
1569         svdm_version = typec_get_negotiated_svdm_version(typec);
1570         if (svdm_version < 0)
1571                 return 0;
1572
1573         switch (cmd_type) {
1574         case CMDT_INIT:
1575                 switch (cmd) {
1576                 case CMD_DISCOVER_IDENT:
1577                         if (PD_VDO_VID(p[0]) != USB_SID_PD)
1578                                 break;
1579
1580                         if (PD_VDO_SVDM_VER(p[0]) < svdm_version) {
1581                                 typec_partner_set_svdm_version(port->partner,
1582                                                                PD_VDO_SVDM_VER(p[0]));
1583                                 svdm_version = PD_VDO_SVDM_VER(p[0]);
1584                         }
1585
1586                         port->ams = DISCOVER_IDENTITY;
1587                         /*
1588                          * PD2.0 Spec 6.10.3: respond with NAK as DFP (data host)
1589                          * PD3.1 Spec 6.4.4.2.5.1: respond with NAK if "invalid field" or
1590                          * "wrong configuation" or "Unrecognized"
1591                          */
1592                         if ((port->data_role == TYPEC_DEVICE || svdm_version >= SVDM_VER_2_0) &&
1593                             port->nr_snk_vdo) {
1594                                 if (svdm_version < SVDM_VER_2_0) {
1595                                         for (i = 0; i < port->nr_snk_vdo_v1; i++)
1596                                                 response[i + 1] = port->snk_vdo_v1[i];
1597                                         rlen = port->nr_snk_vdo_v1 + 1;
1598
1599                                 } else {
1600                                         for (i = 0; i < port->nr_snk_vdo; i++)
1601                                                 response[i + 1] = port->snk_vdo[i];
1602                                         rlen = port->nr_snk_vdo + 1;
1603                                 }
1604                         }
1605                         break;
1606                 case CMD_DISCOVER_SVID:
1607                         port->ams = DISCOVER_SVIDS;
1608                         break;
1609                 case CMD_DISCOVER_MODES:
1610                         port->ams = DISCOVER_MODES;
1611                         break;
1612                 case CMD_ENTER_MODE:
1613                         port->ams = DFP_TO_UFP_ENTER_MODE;
1614                         break;
1615                 case CMD_EXIT_MODE:
1616                         port->ams = DFP_TO_UFP_EXIT_MODE;
1617                         break;
1618                 case CMD_ATTENTION:
1619                         /* Attention command does not have response */
1620                         *adev_action = ADEV_ATTENTION;
1621                         return 0;
1622                 default:
1623                         break;
1624                 }
1625                 if (rlen >= 1) {
1626                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1627                 } else if (rlen == 0) {
1628                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1629                         rlen = 1;
1630                 } else {
1631                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1632                         rlen = 1;
1633                 }
1634                 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1635                               (VDO_SVDM_VERS(typec_get_negotiated_svdm_version(typec)));
1636                 break;
1637         case CMDT_RSP_ACK:
1638                 /* silently drop message if we are not connected */
1639                 if (IS_ERR_OR_NULL(port->partner))
1640                         break;
1641
1642                 tcpm_ams_finish(port);
1643
1644                 switch (cmd) {
1645                 case CMD_DISCOVER_IDENT:
1646                         if (PD_VDO_SVDM_VER(p[0]) < svdm_version)
1647                                 typec_partner_set_svdm_version(port->partner,
1648                                                                PD_VDO_SVDM_VER(p[0]));
1649                         /* 6.4.4.3.1 */
1650                         svdm_consume_identity(port, p, cnt);
1651                         response[0] = VDO(USB_SID_PD, 1, typec_get_negotiated_svdm_version(typec),
1652                                           CMD_DISCOVER_SVID);
1653                         rlen = 1;
1654                         break;
1655                 case CMD_DISCOVER_SVID:
1656                         /* 6.4.4.3.2 */
1657                         if (svdm_consume_svids(port, p, cnt)) {
1658                                 response[0] = VDO(USB_SID_PD, 1, svdm_version, CMD_DISCOVER_SVID);
1659                                 rlen = 1;
1660                         } else if (modep->nsvids && supports_modal(port)) {
1661                                 response[0] = VDO(modep->svids[0], 1, svdm_version,
1662                                                   CMD_DISCOVER_MODES);
1663                                 rlen = 1;
1664                         }
1665                         break;
1666                 case CMD_DISCOVER_MODES:
1667                         /* 6.4.4.3.3 */
1668                         svdm_consume_modes(port, p, cnt);
1669                         modep->svid_index++;
1670                         if (modep->svid_index < modep->nsvids) {
1671                                 u16 svid = modep->svids[modep->svid_index];
1672                                 response[0] = VDO(svid, 1, svdm_version, CMD_DISCOVER_MODES);
1673                                 rlen = 1;
1674                         } else {
1675                                 tcpm_register_partner_altmodes(port);
1676                                 port->vdm_sm_running = false;
1677                         }
1678                         break;
1679                 case CMD_ENTER_MODE:
1680                         if (adev && pdev) {
1681                                 typec_altmode_update_active(pdev, true);
1682                                 *adev_action = ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL;
1683                         }
1684                         return 0;
1685                 case CMD_EXIT_MODE:
1686                         if (adev && pdev) {
1687                                 typec_altmode_update_active(pdev, false);
1688                                 /* Back to USB Operation */
1689                                 *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1690                                 return 0;
1691                         }
1692                         break;
1693                 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1694                         break;
1695                 default:
1696                         /* Unrecognized SVDM */
1697                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1698                         rlen = 1;
1699                         response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1700                                       (VDO_SVDM_VERS(svdm_version));
1701                         break;
1702                 }
1703                 break;
1704         case CMDT_RSP_NAK:
1705                 tcpm_ams_finish(port);
1706                 switch (cmd) {
1707                 case CMD_DISCOVER_IDENT:
1708                 case CMD_DISCOVER_SVID:
1709                 case CMD_DISCOVER_MODES:
1710                 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1711                         break;
1712                 case CMD_ENTER_MODE:
1713                         /* Back to USB Operation */
1714                         *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1715                         return 0;
1716                 default:
1717                         /* Unrecognized SVDM */
1718                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1719                         rlen = 1;
1720                         response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1721                                       (VDO_SVDM_VERS(svdm_version));
1722                         break;
1723                 }
1724                 port->vdm_sm_running = false;
1725                 break;
1726         default:
1727                 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1728                 rlen = 1;
1729                 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1730                               (VDO_SVDM_VERS(svdm_version));
1731                 port->vdm_sm_running = false;
1732                 break;
1733         }
1734
1735         /* Informing the alternate mode drivers about everything */
1736         *adev_action = ADEV_QUEUE_VDM;
1737         return rlen;
1738 }
1739
1740 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1741                                     const __le32 *payload, int cnt)
1742 {
1743         enum adev_actions adev_action = ADEV_NONE;
1744         struct typec_altmode *adev;
1745         u32 p[PD_MAX_PAYLOAD];
1746         u32 response[8] = { };
1747         int i, rlen = 0;
1748
1749         for (i = 0; i < cnt; i++)
1750                 p[i] = le32_to_cpu(payload[i]);
1751
1752         adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1753                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1754
1755         if (port->vdm_state == VDM_STATE_BUSY) {
1756                 /* If UFP responded busy retry after timeout */
1757                 if (PD_VDO_CMDT(p[0]) == CMDT_RSP_BUSY) {
1758                         port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1759                         port->vdo_retry = (p[0] & ~VDO_CMDT_MASK) |
1760                                 CMDT_INIT;
1761                         mod_vdm_delayed_work(port, PD_T_VDM_BUSY);
1762                         return;
1763                 }
1764                 port->vdm_state = VDM_STATE_DONE;
1765         }
1766
1767         if (PD_VDO_SVDM(p[0])) {
1768                 rlen = tcpm_pd_svdm(port, adev, p, cnt, response, &adev_action);
1769         } else {
1770                 if (port->negotiated_rev >= PD_REV30)
1771                         tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1772         }
1773
1774         /*
1775          * We are done with any state stored in the port struct now, except
1776          * for any port struct changes done by the tcpm_queue_vdm() call
1777          * below, which is a separate operation.
1778          *
1779          * So we can safely release the lock here; and we MUST release the
1780          * lock here to avoid an AB BA lock inversion:
1781          *
1782          * If we keep the lock here then the lock ordering in this path is:
1783          * 1. tcpm_pd_rx_handler take the tcpm port lock
1784          * 2. One of the typec_altmode_* calls below takes the alt-mode's lock
1785          *
1786          * And we also have this ordering:
1787          * 1. alt-mode driver takes the alt-mode's lock
1788          * 2. alt-mode driver calls tcpm_altmode_enter which takes the
1789          *    tcpm port lock
1790          *
1791          * Dropping our lock here avoids this.
1792          */
1793         mutex_unlock(&port->lock);
1794
1795         if (adev) {
1796                 switch (adev_action) {
1797                 case ADEV_NONE:
1798                         break;
1799                 case ADEV_NOTIFY_USB_AND_QUEUE_VDM:
1800                         WARN_ON(typec_altmode_notify(adev, TYPEC_STATE_USB, NULL));
1801                         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1802                         break;
1803                 case ADEV_QUEUE_VDM:
1804                         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1805                         break;
1806                 case ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL:
1807                         if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1808                                 int svdm_version = typec_get_negotiated_svdm_version(
1809                                                                         port->typec_port);
1810                                 if (svdm_version < 0)
1811                                         break;
1812
1813                                 response[0] = VDO(adev->svid, 1, svdm_version,
1814                                                   CMD_EXIT_MODE);
1815                                 response[0] |= VDO_OPOS(adev->mode);
1816                                 rlen = 1;
1817                         }
1818                         break;
1819                 case ADEV_ATTENTION:
1820                         typec_altmode_attention(adev, p[1]);
1821                         break;
1822                 }
1823         }
1824
1825         /*
1826          * We must re-take the lock here to balance the unlock in
1827          * tcpm_pd_rx_handler, note that no changes, other then the
1828          * tcpm_queue_vdm call, are made while the lock is held again.
1829          * All that is done after the call is unwinding the call stack until
1830          * we return to tcpm_pd_rx_handler and do the unlock there.
1831          */
1832         mutex_lock(&port->lock);
1833
1834         if (rlen > 0)
1835                 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1836 }
1837
1838 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1839                           const u32 *data, int count)
1840 {
1841         int svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
1842         u32 header;
1843
1844         if (svdm_version < 0)
1845                 return;
1846
1847         if (WARN_ON(count > VDO_MAX_SIZE - 1))
1848                 count = VDO_MAX_SIZE - 1;
1849
1850         /* set VDM header with VID & CMD */
1851         header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1852                         1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION),
1853                         svdm_version, cmd);
1854         tcpm_queue_vdm(port, header, data, count);
1855 }
1856
1857 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1858 {
1859         unsigned int timeout;
1860         int cmd = PD_VDO_CMD(vdm_hdr);
1861
1862         /* its not a structured VDM command */
1863         if (!PD_VDO_SVDM(vdm_hdr))
1864                 return PD_T_VDM_UNSTRUCTURED;
1865
1866         switch (PD_VDO_CMDT(vdm_hdr)) {
1867         case CMDT_INIT:
1868                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1869                         timeout = PD_T_VDM_WAIT_MODE_E;
1870                 else
1871                         timeout = PD_T_VDM_SNDR_RSP;
1872                 break;
1873         default:
1874                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1875                         timeout = PD_T_VDM_E_MODE;
1876                 else
1877                         timeout = PD_T_VDM_RCVR_RSP;
1878                 break;
1879         }
1880         return timeout;
1881 }
1882
1883 static void vdm_run_state_machine(struct tcpm_port *port)
1884 {
1885         struct pd_message msg;
1886         int i, res = 0;
1887         u32 vdo_hdr = port->vdo_data[0];
1888
1889         switch (port->vdm_state) {
1890         case VDM_STATE_READY:
1891                 /* Only transmit VDM if attached */
1892                 if (!port->attached) {
1893                         port->vdm_state = VDM_STATE_ERR_BUSY;
1894                         break;
1895                 }
1896
1897                 /*
1898                  * if there's traffic or we're not in PDO ready state don't send
1899                  * a VDM.
1900                  */
1901                 if (port->state != SRC_READY && port->state != SNK_READY)
1902                         break;
1903
1904                 /* TODO: AMS operation for Unstructured VDM */
1905                 if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) {
1906                         switch (PD_VDO_CMD(vdo_hdr)) {
1907                         case CMD_DISCOVER_IDENT:
1908                                 res = tcpm_ams_start(port, DISCOVER_IDENTITY);
1909                                 if (res == 0)
1910                                         port->send_discover = false;
1911                                 else if (res == -EAGAIN)
1912                                         mod_send_discover_delayed_work(port,
1913                                                                        SEND_DISCOVER_RETRY_MS);
1914                                 break;
1915                         case CMD_DISCOVER_SVID:
1916                                 res = tcpm_ams_start(port, DISCOVER_SVIDS);
1917                                 break;
1918                         case CMD_DISCOVER_MODES:
1919                                 res = tcpm_ams_start(port, DISCOVER_MODES);
1920                                 break;
1921                         case CMD_ENTER_MODE:
1922                                 res = tcpm_ams_start(port, DFP_TO_UFP_ENTER_MODE);
1923                                 break;
1924                         case CMD_EXIT_MODE:
1925                                 res = tcpm_ams_start(port, DFP_TO_UFP_EXIT_MODE);
1926                                 break;
1927                         case CMD_ATTENTION:
1928                                 res = tcpm_ams_start(port, ATTENTION);
1929                                 break;
1930                         case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1931                                 res = tcpm_ams_start(port, STRUCTURED_VDMS);
1932                                 break;
1933                         default:
1934                                 res = -EOPNOTSUPP;
1935                                 break;
1936                         }
1937
1938                         if (res < 0) {
1939                                 port->vdm_state = VDM_STATE_ERR_BUSY;
1940                                 return;
1941                         }
1942                 }
1943
1944                 port->vdm_state = VDM_STATE_SEND_MESSAGE;
1945                 mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30 &&
1946                                             port->pwr_role == TYPEC_SOURCE &&
1947                                             PD_VDO_SVDM(vdo_hdr) &&
1948                                             PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
1949                                            PD_T_SINK_TX : 0);
1950                 break;
1951         case VDM_STATE_WAIT_RSP_BUSY:
1952                 port->vdo_data[0] = port->vdo_retry;
1953                 port->vdo_count = 1;
1954                 port->vdm_state = VDM_STATE_READY;
1955                 tcpm_ams_finish(port);
1956                 break;
1957         case VDM_STATE_BUSY:
1958                 port->vdm_state = VDM_STATE_ERR_TMOUT;
1959                 if (port->ams != NONE_AMS)
1960                         tcpm_ams_finish(port);
1961                 break;
1962         case VDM_STATE_ERR_SEND:
1963                 /*
1964                  * A partner which does not support USB PD will not reply,
1965                  * so this is not a fatal error. At the same time, some
1966                  * devices may not return GoodCRC under some circumstances,
1967                  * so we need to retry.
1968                  */
1969                 if (port->vdm_retries < 3) {
1970                         tcpm_log(port, "VDM Tx error, retry");
1971                         port->vdm_retries++;
1972                         port->vdm_state = VDM_STATE_READY;
1973                         if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT)
1974                                 tcpm_ams_finish(port);
1975                 } else {
1976                         tcpm_ams_finish(port);
1977                 }
1978                 break;
1979         case VDM_STATE_SEND_MESSAGE:
1980                 /* Prepare and send VDM */
1981                 memset(&msg, 0, sizeof(msg));
1982                 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1983                                           port->pwr_role,
1984                                           port->data_role,
1985                                           port->negotiated_rev,
1986                                           port->message_id, port->vdo_count);
1987                 for (i = 0; i < port->vdo_count; i++)
1988                         msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1989                 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1990                 if (res < 0) {
1991                         port->vdm_state = VDM_STATE_ERR_SEND;
1992                 } else {
1993                         unsigned long timeout;
1994
1995                         port->vdm_retries = 0;
1996                         port->vdm_state = VDM_STATE_BUSY;
1997                         timeout = vdm_ready_timeout(vdo_hdr);
1998                         mod_vdm_delayed_work(port, timeout);
1999                 }
2000                 break;
2001         default:
2002                 break;
2003         }
2004 }
2005
2006 static void vdm_state_machine_work(struct kthread_work *work)
2007 {
2008         struct tcpm_port *port = container_of(work, struct tcpm_port, vdm_state_machine);
2009         enum vdm_states prev_state;
2010
2011         mutex_lock(&port->lock);
2012
2013         /*
2014          * Continue running as long as the port is not busy and there was
2015          * a state change.
2016          */
2017         do {
2018                 prev_state = port->vdm_state;
2019                 vdm_run_state_machine(port);
2020         } while (port->vdm_state != prev_state &&
2021                  port->vdm_state != VDM_STATE_BUSY &&
2022                  port->vdm_state != VDM_STATE_SEND_MESSAGE);
2023
2024         if (port->vdm_state < VDM_STATE_READY)
2025                 port->vdm_sm_running = false;
2026
2027         mutex_unlock(&port->lock);
2028 }
2029
2030 enum pdo_err {
2031         PDO_NO_ERR,
2032         PDO_ERR_NO_VSAFE5V,
2033         PDO_ERR_VSAFE5V_NOT_FIRST,
2034         PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
2035         PDO_ERR_FIXED_NOT_SORTED,
2036         PDO_ERR_VARIABLE_BATT_NOT_SORTED,
2037         PDO_ERR_DUPE_PDO,
2038         PDO_ERR_PPS_APDO_NOT_SORTED,
2039         PDO_ERR_DUPE_PPS_APDO,
2040 };
2041
2042 static const char * const pdo_err_msg[] = {
2043         [PDO_ERR_NO_VSAFE5V] =
2044         " err: source/sink caps should atleast have vSafe5V",
2045         [PDO_ERR_VSAFE5V_NOT_FIRST] =
2046         " err: vSafe5V Fixed Supply Object Shall always be the first object",
2047         [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
2048         " err: PDOs should be in the following order: Fixed; Battery; Variable",
2049         [PDO_ERR_FIXED_NOT_SORTED] =
2050         " err: Fixed supply pdos should be in increasing order of their fixed voltage",
2051         [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
2052         " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
2053         [PDO_ERR_DUPE_PDO] =
2054         " err: Variable/Batt supply pdos cannot have same min/max voltage",
2055         [PDO_ERR_PPS_APDO_NOT_SORTED] =
2056         " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
2057         [PDO_ERR_DUPE_PPS_APDO] =
2058         " err: Programmable power supply apdos cannot have same min/max voltage and max current",
2059 };
2060
2061 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
2062                                   unsigned int nr_pdo)
2063 {
2064         unsigned int i;
2065
2066         /* Should at least contain vSafe5v */
2067         if (nr_pdo < 1)
2068                 return PDO_ERR_NO_VSAFE5V;
2069
2070         /* The vSafe5V Fixed Supply Object Shall always be the first object */
2071         if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
2072             pdo_fixed_voltage(pdo[0]) != VSAFE5V)
2073                 return PDO_ERR_VSAFE5V_NOT_FIRST;
2074
2075         for (i = 1; i < nr_pdo; i++) {
2076                 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
2077                         return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
2078                 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
2079                         enum pd_pdo_type type = pdo_type(pdo[i]);
2080
2081                         switch (type) {
2082                         /*
2083                          * The remaining Fixed Supply Objects, if
2084                          * present, shall be sent in voltage order;
2085                          * lowest to highest.
2086                          */
2087                         case PDO_TYPE_FIXED:
2088                                 if (pdo_fixed_voltage(pdo[i]) <=
2089                                     pdo_fixed_voltage(pdo[i - 1]))
2090                                         return PDO_ERR_FIXED_NOT_SORTED;
2091                                 break;
2092                         /*
2093                          * The Battery Supply Objects and Variable
2094                          * supply, if present shall be sent in Minimum
2095                          * Voltage order; lowest to highest.
2096                          */
2097                         case PDO_TYPE_VAR:
2098                         case PDO_TYPE_BATT:
2099                                 if (pdo_min_voltage(pdo[i]) <
2100                                     pdo_min_voltage(pdo[i - 1]))
2101                                         return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
2102                                 else if ((pdo_min_voltage(pdo[i]) ==
2103                                           pdo_min_voltage(pdo[i - 1])) &&
2104                                          (pdo_max_voltage(pdo[i]) ==
2105                                           pdo_max_voltage(pdo[i - 1])))
2106                                         return PDO_ERR_DUPE_PDO;
2107                                 break;
2108                         /*
2109                          * The Programmable Power Supply APDOs, if present,
2110                          * shall be sent in Maximum Voltage order;
2111                          * lowest to highest.
2112                          */
2113                         case PDO_TYPE_APDO:
2114                                 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
2115                                         break;
2116
2117                                 if (pdo_pps_apdo_max_voltage(pdo[i]) <
2118                                     pdo_pps_apdo_max_voltage(pdo[i - 1]))
2119                                         return PDO_ERR_PPS_APDO_NOT_SORTED;
2120                                 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
2121                                           pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
2122                                          pdo_pps_apdo_max_voltage(pdo[i]) ==
2123                                           pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
2124                                          pdo_pps_apdo_max_current(pdo[i]) ==
2125                                           pdo_pps_apdo_max_current(pdo[i - 1]))
2126                                         return PDO_ERR_DUPE_PPS_APDO;
2127                                 break;
2128                         default:
2129                                 tcpm_log_force(port, " Unknown pdo type");
2130                         }
2131                 }
2132         }
2133
2134         return PDO_NO_ERR;
2135 }
2136
2137 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
2138                               unsigned int nr_pdo)
2139 {
2140         enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
2141
2142         if (err_index != PDO_NO_ERR) {
2143                 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
2144                 return -EINVAL;
2145         }
2146
2147         return 0;
2148 }
2149
2150 static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
2151 {
2152         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2153         int svdm_version;
2154         u32 header;
2155
2156         svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2157         if (svdm_version < 0)
2158                 return svdm_version;
2159
2160         header = VDO(altmode->svid, vdo ? 2 : 1, svdm_version, CMD_ENTER_MODE);
2161         header |= VDO_OPOS(altmode->mode);
2162
2163         tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
2164         return 0;
2165 }
2166
2167 static int tcpm_altmode_exit(struct typec_altmode *altmode)
2168 {
2169         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2170         int svdm_version;
2171         u32 header;
2172
2173         svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2174         if (svdm_version < 0)
2175                 return svdm_version;
2176
2177         header = VDO(altmode->svid, 1, svdm_version, CMD_EXIT_MODE);
2178         header |= VDO_OPOS(altmode->mode);
2179
2180         tcpm_queue_vdm_unlocked(port, header, NULL, 0);
2181         return 0;
2182 }
2183
2184 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
2185                             u32 header, const u32 *data, int count)
2186 {
2187         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2188
2189         tcpm_queue_vdm_unlocked(port, header, data, count - 1);
2190
2191         return 0;
2192 }
2193
2194 static const struct typec_altmode_ops tcpm_altmode_ops = {
2195         .enter = tcpm_altmode_enter,
2196         .exit = tcpm_altmode_exit,
2197         .vdm = tcpm_altmode_vdm,
2198 };
2199
2200 /*
2201  * PD (data, control) command handling functions
2202  */
2203 static inline enum tcpm_state ready_state(struct tcpm_port *port)
2204 {
2205         if (port->pwr_role == TYPEC_SOURCE)
2206                 return SRC_READY;
2207         else
2208                 return SNK_READY;
2209 }
2210
2211 static int tcpm_pd_send_control(struct tcpm_port *port,
2212                                 enum pd_ctrl_msg_type type);
2213
2214 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
2215                               int cnt)
2216 {
2217         u32 p0 = le32_to_cpu(payload[0]);
2218         unsigned int type = usb_pd_ado_type(p0);
2219
2220         if (!type) {
2221                 tcpm_log(port, "Alert message received with no type");
2222                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2223                 return;
2224         }
2225
2226         /* Just handling non-battery alerts for now */
2227         if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
2228                 if (port->pwr_role == TYPEC_SOURCE) {
2229                         port->upcoming_state = GET_STATUS_SEND;
2230                         tcpm_ams_start(port, GETTING_SOURCE_SINK_STATUS);
2231                 } else {
2232                         /*
2233                          * Do not check SinkTxOk here in case the Source doesn't set its Rp to
2234                          * SinkTxOk in time.
2235                          */
2236                         port->ams = GETTING_SOURCE_SINK_STATUS;
2237                         tcpm_set_state(port, GET_STATUS_SEND, 0);
2238                 }
2239         } else {
2240                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2241         }
2242 }
2243
2244 static int tcpm_set_auto_vbus_discharge_threshold(struct tcpm_port *port,
2245                                                   enum typec_pwr_opmode mode, bool pps_active,
2246                                                   u32 requested_vbus_voltage)
2247 {
2248         int ret;
2249
2250         if (!port->tcpc->set_auto_vbus_discharge_threshold)
2251                 return 0;
2252
2253         ret = port->tcpc->set_auto_vbus_discharge_threshold(port->tcpc, mode, pps_active,
2254                                                             requested_vbus_voltage);
2255         tcpm_log_force(port,
2256                        "set_auto_vbus_discharge_threshold mode:%d pps_active:%c vbus:%u ret:%d",
2257                        mode, pps_active ? 'y' : 'n', requested_vbus_voltage, ret);
2258
2259         return ret;
2260 }
2261
2262 static void tcpm_pd_handle_state(struct tcpm_port *port,
2263                                  enum tcpm_state state,
2264                                  enum tcpm_ams ams,
2265                                  unsigned int delay_ms)
2266 {
2267         switch (port->state) {
2268         case SRC_READY:
2269         case SNK_READY:
2270                 port->ams = ams;
2271                 tcpm_set_state(port, state, delay_ms);
2272                 break;
2273         /* 8.3.3.4.1.1 and 6.8.1 power transitioning */
2274         case SNK_TRANSITION_SINK:
2275         case SNK_TRANSITION_SINK_VBUS:
2276         case SRC_TRANSITION_SUPPLY:
2277                 tcpm_set_state(port, HARD_RESET_SEND, 0);
2278                 break;
2279         default:
2280                 if (!tcpm_ams_interruptible(port)) {
2281                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2282                                        SRC_SOFT_RESET_WAIT_SNK_TX :
2283                                        SNK_SOFT_RESET,
2284                                        0);
2285                 } else {
2286                         /* process the Message 6.8.1 */
2287                         port->upcoming_state = state;
2288                         port->next_ams = ams;
2289                         tcpm_set_state(port, ready_state(port), delay_ms);
2290                 }
2291                 break;
2292         }
2293 }
2294
2295 static void tcpm_pd_handle_msg(struct tcpm_port *port,
2296                                enum pd_msg_request message,
2297                                enum tcpm_ams ams)
2298 {
2299         switch (port->state) {
2300         case SRC_READY:
2301         case SNK_READY:
2302                 port->ams = ams;
2303                 tcpm_queue_message(port, message);
2304                 break;
2305         /* PD 3.0 Spec 8.3.3.4.1.1 and 6.8.1 */
2306         case SNK_TRANSITION_SINK:
2307         case SNK_TRANSITION_SINK_VBUS:
2308         case SRC_TRANSITION_SUPPLY:
2309                 tcpm_set_state(port, HARD_RESET_SEND, 0);
2310                 break;
2311         default:
2312                 if (!tcpm_ams_interruptible(port)) {
2313                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2314                                        SRC_SOFT_RESET_WAIT_SNK_TX :
2315                                        SNK_SOFT_RESET,
2316                                        0);
2317                 } else {
2318                         port->next_ams = ams;
2319                         tcpm_set_state(port, ready_state(port), 0);
2320                         /* 6.8.1 process the Message */
2321                         tcpm_queue_message(port, message);
2322                 }
2323                 break;
2324         }
2325 }
2326
2327 static void tcpm_pd_data_request(struct tcpm_port *port,
2328                                  const struct pd_message *msg)
2329 {
2330         enum pd_data_msg_type type = pd_header_type_le(msg->header);
2331         unsigned int cnt = pd_header_cnt_le(msg->header);
2332         unsigned int rev = pd_header_rev_le(msg->header);
2333         unsigned int i;
2334         enum frs_typec_current partner_frs_current;
2335         bool frs_enable;
2336         int ret;
2337
2338         if (tcpm_vdm_ams(port) && type != PD_DATA_VENDOR_DEF) {
2339                 port->vdm_state = VDM_STATE_ERR_BUSY;
2340                 tcpm_ams_finish(port);
2341                 mod_vdm_delayed_work(port, 0);
2342         }
2343
2344         switch (type) {
2345         case PD_DATA_SOURCE_CAP:
2346                 for (i = 0; i < cnt; i++)
2347                         port->source_caps[i] = le32_to_cpu(msg->payload[i]);
2348
2349                 port->nr_source_caps = cnt;
2350
2351                 tcpm_log_source_caps(port);
2352
2353                 tcpm_validate_caps(port, port->source_caps,
2354                                    port->nr_source_caps);
2355
2356                 /*
2357                  * Adjust revision in subsequent message headers, as required,
2358                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2359                  * support Rev 1.0 so just do nothing in that scenario.
2360                  */
2361                 if (rev == PD_REV10) {
2362                         if (port->ams == GET_SOURCE_CAPABILITIES)
2363                                 tcpm_ams_finish(port);
2364                         break;
2365                 }
2366
2367                 if (rev < PD_MAX_REV)
2368                         port->negotiated_rev = rev;
2369
2370                 if (port->pwr_role == TYPEC_SOURCE) {
2371                         if (port->ams == GET_SOURCE_CAPABILITIES)
2372                                 tcpm_pd_handle_state(port, SRC_READY, NONE_AMS, 0);
2373                         /* Unexpected Source Capabilities */
2374                         else
2375                                 tcpm_pd_handle_msg(port,
2376                                                    port->negotiated_rev < PD_REV30 ?
2377                                                    PD_MSG_CTRL_REJECT :
2378                                                    PD_MSG_CTRL_NOT_SUPP,
2379                                                    NONE_AMS);
2380                 } else if (port->state == SNK_WAIT_CAPABILITIES) {
2381                 /*
2382                  * This message may be received even if VBUS is not
2383                  * present. This is quite unexpected; see USB PD
2384                  * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
2385                  * However, at the same time, we must be ready to
2386                  * receive this message and respond to it 15ms after
2387                  * receiving PS_RDY during power swap operations, no matter
2388                  * if VBUS is available or not (USB PD specification,
2389                  * section 6.5.9.2).
2390                  * So we need to accept the message either way,
2391                  * but be prepared to keep waiting for VBUS after it was
2392                  * handled.
2393                  */
2394                         port->ams = POWER_NEGOTIATION;
2395                         port->in_ams = true;
2396                         tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
2397                 } else {
2398                         if (port->ams == GET_SOURCE_CAPABILITIES)
2399                                 tcpm_ams_finish(port);
2400                         tcpm_pd_handle_state(port, SNK_NEGOTIATE_CAPABILITIES,
2401                                              POWER_NEGOTIATION, 0);
2402                 }
2403                 break;
2404         case PD_DATA_REQUEST:
2405                 /*
2406                  * Adjust revision in subsequent message headers, as required,
2407                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2408                  * support Rev 1.0 so just reject in that scenario.
2409                  */
2410                 if (rev == PD_REV10) {
2411                         tcpm_pd_handle_msg(port,
2412                                            port->negotiated_rev < PD_REV30 ?
2413                                            PD_MSG_CTRL_REJECT :
2414                                            PD_MSG_CTRL_NOT_SUPP,
2415                                            NONE_AMS);
2416                         break;
2417                 }
2418
2419                 if (rev < PD_MAX_REV)
2420                         port->negotiated_rev = rev;
2421
2422                 if (port->pwr_role != TYPEC_SOURCE || cnt != 1) {
2423                         tcpm_pd_handle_msg(port,
2424                                            port->negotiated_rev < PD_REV30 ?
2425                                            PD_MSG_CTRL_REJECT :
2426                                            PD_MSG_CTRL_NOT_SUPP,
2427                                            NONE_AMS);
2428                         break;
2429                 }
2430
2431                 port->sink_request = le32_to_cpu(msg->payload[0]);
2432
2433                 if (port->vdm_sm_running && port->explicit_contract) {
2434                         tcpm_pd_handle_msg(port, PD_MSG_CTRL_WAIT, port->ams);
2435                         break;
2436                 }
2437
2438                 if (port->state == SRC_SEND_CAPABILITIES)
2439                         tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
2440                 else
2441                         tcpm_pd_handle_state(port, SRC_NEGOTIATE_CAPABILITIES,
2442                                              POWER_NEGOTIATION, 0);
2443                 break;
2444         case PD_DATA_SINK_CAP:
2445                 /* We don't do anything with this at the moment... */
2446                 for (i = 0; i < cnt; i++)
2447                         port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
2448
2449                 partner_frs_current = (port->sink_caps[0] & PDO_FIXED_FRS_CURR_MASK) >>
2450                         PDO_FIXED_FRS_CURR_SHIFT;
2451                 frs_enable = partner_frs_current && (partner_frs_current <=
2452                                                      port->new_source_frs_current);
2453                 tcpm_log(port,
2454                          "Port partner FRS capable partner_frs_current:%u port_frs_current:%u enable:%c",
2455                          partner_frs_current, port->new_source_frs_current, frs_enable ? 'y' : 'n');
2456                 if (frs_enable) {
2457                         ret  = port->tcpc->enable_frs(port->tcpc, true);
2458                         tcpm_log(port, "Enable FRS %s, ret:%d\n", ret ? "fail" : "success", ret);
2459                 }
2460
2461                 port->nr_sink_caps = cnt;
2462                 port->sink_cap_done = true;
2463                 if (port->ams == GET_SINK_CAPABILITIES)
2464                         tcpm_set_state(port, ready_state(port), 0);
2465                 /* Unexpected Sink Capabilities */
2466                 else
2467                         tcpm_pd_handle_msg(port,
2468                                            port->negotiated_rev < PD_REV30 ?
2469                                            PD_MSG_CTRL_REJECT :
2470                                            PD_MSG_CTRL_NOT_SUPP,
2471                                            NONE_AMS);
2472                 break;
2473         case PD_DATA_VENDOR_DEF:
2474                 if (tcpm_vdm_ams(port) || port->nr_snk_vdo)
2475                         tcpm_handle_vdm_request(port, msg->payload, cnt);
2476                 else if (port->negotiated_rev > PD_REV20)
2477                         tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2478                 break;
2479         case PD_DATA_BIST:
2480                 port->bist_request = le32_to_cpu(msg->payload[0]);
2481                 tcpm_pd_handle_state(port, BIST_RX, BIST, 0);
2482                 break;
2483         case PD_DATA_ALERT:
2484                 if (port->state != SRC_READY && port->state != SNK_READY)
2485                         tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2486                                              SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2487                                              NONE_AMS, 0);
2488                 else
2489                         tcpm_handle_alert(port, msg->payload, cnt);
2490                 break;
2491         case PD_DATA_BATT_STATUS:
2492         case PD_DATA_GET_COUNTRY_INFO:
2493                 /* Currently unsupported */
2494                 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2495                                    PD_MSG_CTRL_REJECT :
2496                                    PD_MSG_CTRL_NOT_SUPP,
2497                                    NONE_AMS);
2498                 break;
2499         default:
2500                 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2501                                    PD_MSG_CTRL_REJECT :
2502                                    PD_MSG_CTRL_NOT_SUPP,
2503                                    NONE_AMS);
2504                 tcpm_log(port, "Unrecognized data message type %#x", type);
2505                 break;
2506         }
2507 }
2508
2509 static void tcpm_pps_complete(struct tcpm_port *port, int result)
2510 {
2511         if (port->pps_pending) {
2512                 port->pps_status = result;
2513                 port->pps_pending = false;
2514                 complete(&port->pps_complete);
2515         }
2516 }
2517
2518 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
2519                                  const struct pd_message *msg)
2520 {
2521         enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2522         enum tcpm_state next_state;
2523
2524         /*
2525          * Stop VDM state machine if interrupted by other Messages while NOT_SUPP is allowed in
2526          * VDM AMS if waiting for VDM responses and will be handled later.
2527          */
2528         if (tcpm_vdm_ams(port) && type != PD_CTRL_NOT_SUPP && type != PD_CTRL_GOOD_CRC) {
2529                 port->vdm_state = VDM_STATE_ERR_BUSY;
2530                 tcpm_ams_finish(port);
2531                 mod_vdm_delayed_work(port, 0);
2532         }
2533
2534         switch (type) {
2535         case PD_CTRL_GOOD_CRC:
2536         case PD_CTRL_PING:
2537                 break;
2538         case PD_CTRL_GET_SOURCE_CAP:
2539                 tcpm_pd_handle_msg(port, PD_MSG_DATA_SOURCE_CAP, GET_SOURCE_CAPABILITIES);
2540                 break;
2541         case PD_CTRL_GET_SINK_CAP:
2542                 tcpm_pd_handle_msg(port, PD_MSG_DATA_SINK_CAP, GET_SINK_CAPABILITIES);
2543                 break;
2544         case PD_CTRL_GOTO_MIN:
2545                 break;
2546         case PD_CTRL_PS_RDY:
2547                 switch (port->state) {
2548                 case SNK_TRANSITION_SINK:
2549                         if (port->vbus_present) {
2550                                 tcpm_set_current_limit(port,
2551                                                        port->req_current_limit,
2552                                                        port->req_supply_voltage);
2553                                 port->explicit_contract = true;
2554                                 tcpm_set_auto_vbus_discharge_threshold(port,
2555                                                                        TYPEC_PWR_MODE_PD,
2556                                                                        port->pps_data.active,
2557                                                                        port->supply_voltage);
2558                                 /* Set VDM running flag ASAP */
2559                                 if (port->data_role == TYPEC_HOST &&
2560                                     port->send_discover)
2561                                         port->vdm_sm_running = true;
2562                                 tcpm_set_state(port, SNK_READY, 0);
2563                         } else {
2564                                 /*
2565                                  * Seen after power swap. Keep waiting for VBUS
2566                                  * in a transitional state.
2567                                  */
2568                                 tcpm_set_state(port,
2569                                                SNK_TRANSITION_SINK_VBUS, 0);
2570                         }
2571                         break;
2572                 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
2573                         tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
2574                         break;
2575                 case PR_SWAP_SNK_SRC_SINK_OFF:
2576                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
2577                         break;
2578                 case VCONN_SWAP_WAIT_FOR_VCONN:
2579                         tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
2580                         break;
2581                 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
2582                         tcpm_set_state(port, FR_SWAP_SNK_SRC_NEW_SINK_READY, 0);
2583                         break;
2584                 default:
2585                         tcpm_pd_handle_state(port,
2586                                              port->pwr_role == TYPEC_SOURCE ?
2587                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2588                                              SNK_SOFT_RESET,
2589                                              NONE_AMS, 0);
2590                         break;
2591                 }
2592                 break;
2593         case PD_CTRL_REJECT:
2594         case PD_CTRL_WAIT:
2595         case PD_CTRL_NOT_SUPP:
2596                 switch (port->state) {
2597                 case SNK_NEGOTIATE_CAPABILITIES:
2598                         /* USB PD specification, Figure 8-43 */
2599                         if (port->explicit_contract) {
2600                                 next_state = SNK_READY;
2601                                 if (port->data_role == TYPEC_HOST &&
2602                                     port->send_discover)
2603                                         port->vdm_sm_running = true;
2604                         } else {
2605                                 next_state = SNK_WAIT_CAPABILITIES;
2606                         }
2607
2608                         /* Threshold was relaxed before sending Request. Restore it back. */
2609                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2610                                                                port->pps_data.active,
2611                                                                port->supply_voltage);
2612                         tcpm_set_state(port, next_state, 0);
2613                         break;
2614                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2615                         /* Revert data back from any requested PPS updates */
2616                         port->pps_data.req_out_volt = port->supply_voltage;
2617                         port->pps_data.req_op_curr = port->current_limit;
2618                         port->pps_status = (type == PD_CTRL_WAIT ?
2619                                             -EAGAIN : -EOPNOTSUPP);
2620
2621                         if (port->data_role == TYPEC_HOST &&
2622                             port->send_discover)
2623                                 port->vdm_sm_running = true;
2624
2625                         /* Threshold was relaxed before sending Request. Restore it back. */
2626                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2627                                                                port->pps_data.active,
2628                                                                port->supply_voltage);
2629
2630                         tcpm_set_state(port, SNK_READY, 0);
2631                         break;
2632                 case DR_SWAP_SEND:
2633                         port->swap_status = (type == PD_CTRL_WAIT ?
2634                                              -EAGAIN : -EOPNOTSUPP);
2635                         tcpm_set_state(port, DR_SWAP_CANCEL, 0);
2636                         break;
2637                 case PR_SWAP_SEND:
2638                         port->swap_status = (type == PD_CTRL_WAIT ?
2639                                              -EAGAIN : -EOPNOTSUPP);
2640                         tcpm_set_state(port, PR_SWAP_CANCEL, 0);
2641                         break;
2642                 case VCONN_SWAP_SEND:
2643                         port->swap_status = (type == PD_CTRL_WAIT ?
2644                                              -EAGAIN : -EOPNOTSUPP);
2645                         tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
2646                         break;
2647                 case FR_SWAP_SEND:
2648                         tcpm_set_state(port, FR_SWAP_CANCEL, 0);
2649                         break;
2650                 case GET_SINK_CAP:
2651                         port->sink_cap_done = true;
2652                         tcpm_set_state(port, ready_state(port), 0);
2653                         break;
2654                 case SRC_READY:
2655                 case SNK_READY:
2656                         if (port->vdm_state > VDM_STATE_READY) {
2657                                 port->vdm_state = VDM_STATE_DONE;
2658                                 if (tcpm_vdm_ams(port))
2659                                         tcpm_ams_finish(port);
2660                                 mod_vdm_delayed_work(port, 0);
2661                                 break;
2662                         }
2663                         fallthrough;
2664                 default:
2665                         tcpm_pd_handle_state(port,
2666                                              port->pwr_role == TYPEC_SOURCE ?
2667                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2668                                              SNK_SOFT_RESET,
2669                                              NONE_AMS, 0);
2670                         break;
2671                 }
2672                 break;
2673         case PD_CTRL_ACCEPT:
2674                 switch (port->state) {
2675                 case SNK_NEGOTIATE_CAPABILITIES:
2676                         port->pps_data.active = false;
2677                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2678                         break;
2679                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2680                         port->pps_data.active = true;
2681                         port->pps_data.min_volt = port->pps_data.req_min_volt;
2682                         port->pps_data.max_volt = port->pps_data.req_max_volt;
2683                         port->pps_data.max_curr = port->pps_data.req_max_curr;
2684                         port->req_supply_voltage = port->pps_data.req_out_volt;
2685                         port->req_current_limit = port->pps_data.req_op_curr;
2686                         power_supply_changed(port->psy);
2687                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2688                         break;
2689                 case SOFT_RESET_SEND:
2690                         if (port->ams == SOFT_RESET_AMS)
2691                                 tcpm_ams_finish(port);
2692                         if (port->pwr_role == TYPEC_SOURCE) {
2693                                 port->upcoming_state = SRC_SEND_CAPABILITIES;
2694                                 tcpm_ams_start(port, POWER_NEGOTIATION);
2695                         } else {
2696                                 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2697                         }
2698                         break;
2699                 case DR_SWAP_SEND:
2700                         if (port->data_role == TYPEC_DEVICE &&
2701                             port->send_discover)
2702                                 port->vdm_sm_running = true;
2703
2704                         tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
2705                         break;
2706                 case PR_SWAP_SEND:
2707                         tcpm_set_state(port, PR_SWAP_START, 0);
2708                         break;
2709                 case VCONN_SWAP_SEND:
2710                         tcpm_set_state(port, VCONN_SWAP_START, 0);
2711                         break;
2712                 case FR_SWAP_SEND:
2713                         tcpm_set_state(port, FR_SWAP_SNK_SRC_TRANSITION_TO_OFF, 0);
2714                         break;
2715                 default:
2716                         tcpm_pd_handle_state(port,
2717                                              port->pwr_role == TYPEC_SOURCE ?
2718                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2719                                              SNK_SOFT_RESET,
2720                                              NONE_AMS, 0);
2721                         break;
2722                 }
2723                 break;
2724         case PD_CTRL_SOFT_RESET:
2725                 port->ams = SOFT_RESET_AMS;
2726                 tcpm_set_state(port, SOFT_RESET, 0);
2727                 break;
2728         case PD_CTRL_DR_SWAP:
2729                 /*
2730                  * XXX
2731                  * 6.3.9: If an alternate mode is active, a request to swap
2732                  * alternate modes shall trigger a port reset.
2733                  */
2734                 if (port->typec_caps.data != TYPEC_PORT_DRD) {
2735                         tcpm_pd_handle_msg(port,
2736                                            port->negotiated_rev < PD_REV30 ?
2737                                            PD_MSG_CTRL_REJECT :
2738                                            PD_MSG_CTRL_NOT_SUPP,
2739                                            NONE_AMS);
2740                 } else {
2741                         if (port->vdm_sm_running) {
2742                                 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2743                                 break;
2744                         }
2745
2746                         tcpm_pd_handle_state(port, DR_SWAP_ACCEPT, DATA_ROLE_SWAP, 0);
2747                 }
2748                 break;
2749         case PD_CTRL_PR_SWAP:
2750                 if (port->port_type != TYPEC_PORT_DRP) {
2751                         tcpm_pd_handle_msg(port,
2752                                            port->negotiated_rev < PD_REV30 ?
2753                                            PD_MSG_CTRL_REJECT :
2754                                            PD_MSG_CTRL_NOT_SUPP,
2755                                            NONE_AMS);
2756                 } else {
2757                         if (port->vdm_sm_running) {
2758                                 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2759                                 break;
2760                         }
2761
2762                         tcpm_pd_handle_state(port, PR_SWAP_ACCEPT, POWER_ROLE_SWAP, 0);
2763                 }
2764                 break;
2765         case PD_CTRL_VCONN_SWAP:
2766                 if (port->vdm_sm_running) {
2767                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2768                         break;
2769                 }
2770
2771                 tcpm_pd_handle_state(port, VCONN_SWAP_ACCEPT, VCONN_SWAP, 0);
2772                 break;
2773         case PD_CTRL_GET_SOURCE_CAP_EXT:
2774         case PD_CTRL_GET_STATUS:
2775         case PD_CTRL_FR_SWAP:
2776         case PD_CTRL_GET_PPS_STATUS:
2777         case PD_CTRL_GET_COUNTRY_CODES:
2778                 /* Currently not supported */
2779                 tcpm_pd_handle_msg(port,
2780                                    port->negotiated_rev < PD_REV30 ?
2781                                    PD_MSG_CTRL_REJECT :
2782                                    PD_MSG_CTRL_NOT_SUPP,
2783                                    NONE_AMS);
2784                 break;
2785         default:
2786                 tcpm_pd_handle_msg(port,
2787                                    port->negotiated_rev < PD_REV30 ?
2788                                    PD_MSG_CTRL_REJECT :
2789                                    PD_MSG_CTRL_NOT_SUPP,
2790                                    NONE_AMS);
2791                 tcpm_log(port, "Unrecognized ctrl message type %#x", type);
2792                 break;
2793         }
2794 }
2795
2796 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
2797                                     const struct pd_message *msg)
2798 {
2799         enum pd_ext_msg_type type = pd_header_type_le(msg->header);
2800         unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
2801
2802         /* stopping VDM state machine if interrupted by other Messages */
2803         if (tcpm_vdm_ams(port)) {
2804                 port->vdm_state = VDM_STATE_ERR_BUSY;
2805                 tcpm_ams_finish(port);
2806                 mod_vdm_delayed_work(port, 0);
2807         }
2808
2809         if (!(le16_to_cpu(msg->ext_msg.header) & PD_EXT_HDR_CHUNKED)) {
2810                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2811                 tcpm_log(port, "Unchunked extended messages unsupported");
2812                 return;
2813         }
2814
2815         if (data_size > PD_EXT_MAX_CHUNK_DATA) {
2816                 tcpm_pd_handle_state(port, CHUNK_NOT_SUPP, NONE_AMS, PD_T_CHUNK_NOT_SUPP);
2817                 tcpm_log(port, "Chunk handling not yet supported");
2818                 return;
2819         }
2820
2821         switch (type) {
2822         case PD_EXT_STATUS:
2823         case PD_EXT_PPS_STATUS:
2824                 if (port->ams == GETTING_SOURCE_SINK_STATUS) {
2825                         tcpm_ams_finish(port);
2826                         tcpm_set_state(port, ready_state(port), 0);
2827                 } else {
2828                         /* unexpected Status or PPS_Status Message */
2829                         tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2830                                              SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2831                                              NONE_AMS, 0);
2832                 }
2833                 break;
2834         case PD_EXT_SOURCE_CAP_EXT:
2835         case PD_EXT_GET_BATT_CAP:
2836         case PD_EXT_GET_BATT_STATUS:
2837         case PD_EXT_BATT_CAP:
2838         case PD_EXT_GET_MANUFACTURER_INFO:
2839         case PD_EXT_MANUFACTURER_INFO:
2840         case PD_EXT_SECURITY_REQUEST:
2841         case PD_EXT_SECURITY_RESPONSE:
2842         case PD_EXT_FW_UPDATE_REQUEST:
2843         case PD_EXT_FW_UPDATE_RESPONSE:
2844         case PD_EXT_COUNTRY_INFO:
2845         case PD_EXT_COUNTRY_CODES:
2846                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2847                 break;
2848         default:
2849                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2850                 tcpm_log(port, "Unrecognized extended message type %#x", type);
2851                 break;
2852         }
2853 }
2854
2855 static void tcpm_pd_rx_handler(struct kthread_work *work)
2856 {
2857         struct pd_rx_event *event = container_of(work,
2858                                                  struct pd_rx_event, work);
2859         const struct pd_message *msg = &event->msg;
2860         unsigned int cnt = pd_header_cnt_le(msg->header);
2861         struct tcpm_port *port = event->port;
2862
2863         mutex_lock(&port->lock);
2864
2865         tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
2866                  port->attached);
2867
2868         if (port->attached) {
2869                 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2870                 unsigned int msgid = pd_header_msgid_le(msg->header);
2871
2872                 /*
2873                  * USB PD standard, 6.6.1.2:
2874                  * "... if MessageID value in a received Message is the
2875                  * same as the stored value, the receiver shall return a
2876                  * GoodCRC Message with that MessageID value and drop
2877                  * the Message (this is a retry of an already received
2878                  * Message). Note: this shall not apply to the Soft_Reset
2879                  * Message which always has a MessageID value of zero."
2880                  */
2881                 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
2882                         goto done;
2883                 port->rx_msgid = msgid;
2884
2885                 /*
2886                  * If both ends believe to be DFP/host, we have a data role
2887                  * mismatch.
2888                  */
2889                 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
2890                     (port->data_role == TYPEC_HOST)) {
2891                         tcpm_log(port,
2892                                  "Data role mismatch, initiating error recovery");
2893                         tcpm_set_state(port, ERROR_RECOVERY, 0);
2894                 } else {
2895                         if (le16_to_cpu(msg->header) & PD_HEADER_EXT_HDR)
2896                                 tcpm_pd_ext_msg_request(port, msg);
2897                         else if (cnt)
2898                                 tcpm_pd_data_request(port, msg);
2899                         else
2900                                 tcpm_pd_ctrl_request(port, msg);
2901                 }
2902         }
2903
2904 done:
2905         mutex_unlock(&port->lock);
2906         kfree(event);
2907 }
2908
2909 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
2910 {
2911         struct pd_rx_event *event;
2912
2913         event = kzalloc(sizeof(*event), GFP_ATOMIC);
2914         if (!event)
2915                 return;
2916
2917         kthread_init_work(&event->work, tcpm_pd_rx_handler);
2918         event->port = port;
2919         memcpy(&event->msg, msg, sizeof(*msg));
2920         kthread_queue_work(port->wq, &event->work);
2921 }
2922 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
2923
2924 static int tcpm_pd_send_control(struct tcpm_port *port,
2925                                 enum pd_ctrl_msg_type type)
2926 {
2927         struct pd_message msg;
2928
2929         memset(&msg, 0, sizeof(msg));
2930         msg.header = PD_HEADER_LE(type, port->pwr_role,
2931                                   port->data_role,
2932                                   port->negotiated_rev,
2933                                   port->message_id, 0);
2934
2935         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2936 }
2937
2938 /*
2939  * Send queued message without affecting state.
2940  * Return true if state machine should go back to sleep,
2941  * false otherwise.
2942  */
2943 static bool tcpm_send_queued_message(struct tcpm_port *port)
2944 {
2945         enum pd_msg_request queued_message;
2946         int ret;
2947
2948         do {
2949                 queued_message = port->queued_message;
2950                 port->queued_message = PD_MSG_NONE;
2951
2952                 switch (queued_message) {
2953                 case PD_MSG_CTRL_WAIT:
2954                         tcpm_pd_send_control(port, PD_CTRL_WAIT);
2955                         break;
2956                 case PD_MSG_CTRL_REJECT:
2957                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
2958                         break;
2959                 case PD_MSG_CTRL_NOT_SUPP:
2960                         tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
2961                         break;
2962                 case PD_MSG_DATA_SINK_CAP:
2963                         ret = tcpm_pd_send_sink_caps(port);
2964                         if (ret < 0) {
2965                                 tcpm_log(port, "Unable to send snk caps, ret=%d", ret);
2966                                 tcpm_set_state(port, SNK_SOFT_RESET, 0);
2967                         }
2968                         tcpm_ams_finish(port);
2969                         break;
2970                 case PD_MSG_DATA_SOURCE_CAP:
2971                         ret = tcpm_pd_send_source_caps(port);
2972                         if (ret < 0) {
2973                                 tcpm_log(port,
2974                                          "Unable to send src caps, ret=%d",
2975                                          ret);
2976                                 tcpm_set_state(port, SOFT_RESET_SEND, 0);
2977                         } else if (port->pwr_role == TYPEC_SOURCE) {
2978                                 tcpm_ams_finish(port);
2979                                 tcpm_set_state(port, HARD_RESET_SEND,
2980                                                PD_T_SENDER_RESPONSE);
2981                         } else {
2982                                 tcpm_ams_finish(port);
2983                         }
2984                         break;
2985                 default:
2986                         break;
2987                 }
2988         } while (port->queued_message != PD_MSG_NONE);
2989
2990         if (port->delayed_state != INVALID_STATE) {
2991                 if (ktime_after(port->delayed_runtime, ktime_get())) {
2992                         mod_tcpm_delayed_work(port, ktime_to_ms(ktime_sub(port->delayed_runtime,
2993                                                                           ktime_get())));
2994                         return true;
2995                 }
2996                 port->delayed_state = INVALID_STATE;
2997         }
2998         return false;
2999 }
3000
3001 static int tcpm_pd_check_request(struct tcpm_port *port)
3002 {
3003         u32 pdo, rdo = port->sink_request;
3004         unsigned int max, op, pdo_max, index;
3005         enum pd_pdo_type type;
3006
3007         index = rdo_index(rdo);
3008         if (!index || index > port->nr_src_pdo)
3009                 return -EINVAL;
3010
3011         pdo = port->src_pdo[index - 1];
3012         type = pdo_type(pdo);
3013         switch (type) {
3014         case PDO_TYPE_FIXED:
3015         case PDO_TYPE_VAR:
3016                 max = rdo_max_current(rdo);
3017                 op = rdo_op_current(rdo);
3018                 pdo_max = pdo_max_current(pdo);
3019
3020                 if (op > pdo_max)
3021                         return -EINVAL;
3022                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3023                         return -EINVAL;
3024
3025                 if (type == PDO_TYPE_FIXED)
3026                         tcpm_log(port,
3027                                  "Requested %u mV, %u mA for %u / %u mA",
3028                                  pdo_fixed_voltage(pdo), pdo_max, op, max);
3029                 else
3030                         tcpm_log(port,
3031                                  "Requested %u -> %u mV, %u mA for %u / %u mA",
3032                                  pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3033                                  pdo_max, op, max);
3034                 break;
3035         case PDO_TYPE_BATT:
3036                 max = rdo_max_power(rdo);
3037                 op = rdo_op_power(rdo);
3038                 pdo_max = pdo_max_power(pdo);
3039
3040                 if (op > pdo_max)
3041                         return -EINVAL;
3042                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3043                         return -EINVAL;
3044                 tcpm_log(port,
3045                          "Requested %u -> %u mV, %u mW for %u / %u mW",
3046                          pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3047                          pdo_max, op, max);
3048                 break;
3049         default:
3050                 return -EINVAL;
3051         }
3052
3053         port->op_vsafe5v = index == 1;
3054
3055         return 0;
3056 }
3057
3058 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
3059 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
3060
3061 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
3062                               int *src_pdo)
3063 {
3064         unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
3065                      max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
3066                      min_snk_mv = 0;
3067         int ret = -EINVAL;
3068
3069         port->pps_data.supported = false;
3070         port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
3071         power_supply_changed(port->psy);
3072
3073         /*
3074          * Select the source PDO providing the most power which has a
3075          * matchig sink cap.
3076          */
3077         for (i = 0; i < port->nr_source_caps; i++) {
3078                 u32 pdo = port->source_caps[i];
3079                 enum pd_pdo_type type = pdo_type(pdo);
3080
3081                 switch (type) {
3082                 case PDO_TYPE_FIXED:
3083                         max_src_mv = pdo_fixed_voltage(pdo);
3084                         min_src_mv = max_src_mv;
3085                         break;
3086                 case PDO_TYPE_BATT:
3087                 case PDO_TYPE_VAR:
3088                         max_src_mv = pdo_max_voltage(pdo);
3089                         min_src_mv = pdo_min_voltage(pdo);
3090                         break;
3091                 case PDO_TYPE_APDO:
3092                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
3093                                 port->pps_data.supported = true;
3094                                 port->usb_type =
3095                                         POWER_SUPPLY_USB_TYPE_PD_PPS;
3096                                 power_supply_changed(port->psy);
3097                         }
3098                         continue;
3099                 default:
3100                         tcpm_log(port, "Invalid source PDO type, ignoring");
3101                         continue;
3102                 }
3103
3104                 switch (type) {
3105                 case PDO_TYPE_FIXED:
3106                 case PDO_TYPE_VAR:
3107                         src_ma = pdo_max_current(pdo);
3108                         src_mw = src_ma * min_src_mv / 1000;
3109                         break;
3110                 case PDO_TYPE_BATT:
3111                         src_mw = pdo_max_power(pdo);
3112                         break;
3113                 case PDO_TYPE_APDO:
3114                         continue;
3115                 default:
3116                         tcpm_log(port, "Invalid source PDO type, ignoring");
3117                         continue;
3118                 }
3119
3120                 for (j = 0; j < port->nr_snk_pdo; j++) {
3121                         pdo = port->snk_pdo[j];
3122
3123                         switch (pdo_type(pdo)) {
3124                         case PDO_TYPE_FIXED:
3125                                 max_snk_mv = pdo_fixed_voltage(pdo);
3126                                 min_snk_mv = max_snk_mv;
3127                                 break;
3128                         case PDO_TYPE_BATT:
3129                         case PDO_TYPE_VAR:
3130                                 max_snk_mv = pdo_max_voltage(pdo);
3131                                 min_snk_mv = pdo_min_voltage(pdo);
3132                                 break;
3133                         case PDO_TYPE_APDO:
3134                                 continue;
3135                         default:
3136                                 tcpm_log(port, "Invalid sink PDO type, ignoring");
3137                                 continue;
3138                         }
3139
3140                         if (max_src_mv <= max_snk_mv &&
3141                                 min_src_mv >= min_snk_mv) {
3142                                 /* Prefer higher voltages if available */
3143                                 if ((src_mw == max_mw && min_src_mv > max_mv) ||
3144                                                         src_mw > max_mw) {
3145                                         *src_pdo = i;
3146                                         *sink_pdo = j;
3147                                         max_mw = src_mw;
3148                                         max_mv = min_src_mv;
3149                                         ret = 0;
3150                                 }
3151                         }
3152                 }
3153         }
3154
3155         return ret;
3156 }
3157
3158 #define min_pps_apdo_current(x, y)      \
3159         min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
3160
3161 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
3162 {
3163         unsigned int i, j, max_mw = 0, max_mv = 0;
3164         unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
3165         unsigned int min_snk_mv, max_snk_mv;
3166         unsigned int max_op_mv;
3167         u32 pdo, src, snk;
3168         unsigned int src_pdo = 0, snk_pdo = 0;
3169
3170         /*
3171          * Select the source PPS APDO providing the most power while staying
3172          * within the board's limits. We skip the first PDO as this is always
3173          * 5V 3A.
3174          */
3175         for (i = 1; i < port->nr_source_caps; ++i) {
3176                 pdo = port->source_caps[i];
3177
3178                 switch (pdo_type(pdo)) {
3179                 case PDO_TYPE_APDO:
3180                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3181                                 tcpm_log(port, "Not PPS APDO (source), ignoring");
3182                                 continue;
3183                         }
3184
3185                         min_src_mv = pdo_pps_apdo_min_voltage(pdo);
3186                         max_src_mv = pdo_pps_apdo_max_voltage(pdo);
3187                         src_ma = pdo_pps_apdo_max_current(pdo);
3188                         src_mw = (src_ma * max_src_mv) / 1000;
3189
3190                         /*
3191                          * Now search through the sink PDOs to find a matching
3192                          * PPS APDO. Again skip the first sink PDO as this will
3193                          * always be 5V 3A.
3194                          */
3195                         for (j = 1; j < port->nr_snk_pdo; j++) {
3196                                 pdo = port->snk_pdo[j];
3197
3198                                 switch (pdo_type(pdo)) {
3199                                 case PDO_TYPE_APDO:
3200                                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3201                                                 tcpm_log(port,
3202                                                          "Not PPS APDO (sink), ignoring");
3203                                                 continue;
3204                                         }
3205
3206                                         min_snk_mv =
3207                                                 pdo_pps_apdo_min_voltage(pdo);
3208                                         max_snk_mv =
3209                                                 pdo_pps_apdo_max_voltage(pdo);
3210                                         break;
3211                                 default:
3212                                         tcpm_log(port,
3213                                                  "Not APDO type (sink), ignoring");
3214                                         continue;
3215                                 }
3216
3217                                 if (min_src_mv <= max_snk_mv &&
3218                                     max_src_mv >= min_snk_mv) {
3219                                         max_op_mv = min(max_src_mv, max_snk_mv);
3220                                         src_mw = (max_op_mv * src_ma) / 1000;
3221                                         /* Prefer higher voltages if available */
3222                                         if ((src_mw == max_mw &&
3223                                              max_op_mv > max_mv) ||
3224                                             src_mw > max_mw) {
3225                                                 src_pdo = i;
3226                                                 snk_pdo = j;
3227                                                 max_mw = src_mw;
3228                                                 max_mv = max_op_mv;
3229                                         }
3230                                 }
3231                         }
3232
3233                         break;
3234                 default:
3235                         tcpm_log(port, "Not APDO type (source), ignoring");
3236                         continue;
3237                 }
3238         }
3239
3240         if (src_pdo) {
3241                 src = port->source_caps[src_pdo];
3242                 snk = port->snk_pdo[snk_pdo];
3243
3244                 port->pps_data.req_min_volt = max(pdo_pps_apdo_min_voltage(src),
3245                                                   pdo_pps_apdo_min_voltage(snk));
3246                 port->pps_data.req_max_volt = min(pdo_pps_apdo_max_voltage(src),
3247                                                   pdo_pps_apdo_max_voltage(snk));
3248                 port->pps_data.req_max_curr = min_pps_apdo_current(src, snk);
3249                 port->pps_data.req_out_volt = min(port->pps_data.req_max_volt,
3250                                                   max(port->pps_data.req_min_volt,
3251                                                       port->pps_data.req_out_volt));
3252                 port->pps_data.req_op_curr = min(port->pps_data.req_max_curr,
3253                                                  port->pps_data.req_op_curr);
3254         }
3255
3256         return src_pdo;
3257 }
3258
3259 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
3260 {
3261         unsigned int mv, ma, mw, flags;
3262         unsigned int max_ma, max_mw;
3263         enum pd_pdo_type type;
3264         u32 pdo, matching_snk_pdo;
3265         int src_pdo_index = 0;
3266         int snk_pdo_index = 0;
3267         int ret;
3268
3269         ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
3270         if (ret < 0)
3271                 return ret;
3272
3273         pdo = port->source_caps[src_pdo_index];
3274         matching_snk_pdo = port->snk_pdo[snk_pdo_index];
3275         type = pdo_type(pdo);
3276
3277         switch (type) {
3278         case PDO_TYPE_FIXED:
3279                 mv = pdo_fixed_voltage(pdo);
3280                 break;
3281         case PDO_TYPE_BATT:
3282         case PDO_TYPE_VAR:
3283                 mv = pdo_min_voltage(pdo);
3284                 break;
3285         default:
3286                 tcpm_log(port, "Invalid PDO selected!");
3287                 return -EINVAL;
3288         }
3289
3290         /* Select maximum available current within the sink pdo's limit */
3291         if (type == PDO_TYPE_BATT) {
3292                 mw = min_power(pdo, matching_snk_pdo);
3293                 ma = 1000 * mw / mv;
3294         } else {
3295                 ma = min_current(pdo, matching_snk_pdo);
3296                 mw = ma * mv / 1000;
3297         }
3298
3299         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3300
3301         /* Set mismatch bit if offered power is less than operating power */
3302         max_ma = ma;
3303         max_mw = mw;
3304         if (mw < port->operating_snk_mw) {
3305                 flags |= RDO_CAP_MISMATCH;
3306                 if (type == PDO_TYPE_BATT &&
3307                     (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
3308                         max_mw = pdo_max_power(matching_snk_pdo);
3309                 else if (pdo_max_current(matching_snk_pdo) >
3310                          pdo_max_current(pdo))
3311                         max_ma = pdo_max_current(matching_snk_pdo);
3312         }
3313
3314         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3315                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
3316                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3317                  port->polarity);
3318
3319         if (type == PDO_TYPE_BATT) {
3320                 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
3321
3322                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
3323                          src_pdo_index, mv, mw,
3324                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3325         } else {
3326                 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
3327
3328                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
3329                          src_pdo_index, mv, ma,
3330                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3331         }
3332
3333         port->req_current_limit = ma;
3334         port->req_supply_voltage = mv;
3335
3336         return 0;
3337 }
3338
3339 static int tcpm_pd_send_request(struct tcpm_port *port)
3340 {
3341         struct pd_message msg;
3342         int ret;
3343         u32 rdo;
3344
3345         ret = tcpm_pd_build_request(port, &rdo);
3346         if (ret < 0)
3347                 return ret;
3348
3349         /*
3350          * Relax the threshold as voltage will be adjusted after Accept Message plus tSrcTransition.
3351          * It is safer to modify the threshold here.
3352          */
3353         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3354
3355         memset(&msg, 0, sizeof(msg));
3356         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3357                                   port->pwr_role,
3358                                   port->data_role,
3359                                   port->negotiated_rev,
3360                                   port->message_id, 1);
3361         msg.payload[0] = cpu_to_le32(rdo);
3362
3363         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3364 }
3365
3366 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
3367 {
3368         unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
3369         enum pd_pdo_type type;
3370         unsigned int src_pdo_index;
3371         u32 pdo;
3372
3373         src_pdo_index = tcpm_pd_select_pps_apdo(port);
3374         if (!src_pdo_index)
3375                 return -EOPNOTSUPP;
3376
3377         pdo = port->source_caps[src_pdo_index];
3378         type = pdo_type(pdo);
3379
3380         switch (type) {
3381         case PDO_TYPE_APDO:
3382                 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3383                         tcpm_log(port, "Invalid APDO selected!");
3384                         return -EINVAL;
3385                 }
3386                 max_mv = port->pps_data.req_max_volt;
3387                 max_ma = port->pps_data.req_max_curr;
3388                 out_mv = port->pps_data.req_out_volt;
3389                 op_ma = port->pps_data.req_op_curr;
3390                 break;
3391         default:
3392                 tcpm_log(port, "Invalid PDO selected!");
3393                 return -EINVAL;
3394         }
3395
3396         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3397
3398         op_mw = (op_ma * out_mv) / 1000;
3399         if (op_mw < port->operating_snk_mw) {
3400                 /*
3401                  * Try raising current to meet power needs. If that's not enough
3402                  * then try upping the voltage. If that's still not enough
3403                  * then we've obviously chosen a PPS APDO which really isn't
3404                  * suitable so abandon ship.
3405                  */
3406                 op_ma = (port->operating_snk_mw * 1000) / out_mv;
3407                 if ((port->operating_snk_mw * 1000) % out_mv)
3408                         ++op_ma;
3409                 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
3410
3411                 if (op_ma > max_ma) {
3412                         op_ma = max_ma;
3413                         out_mv = (port->operating_snk_mw * 1000) / op_ma;
3414                         if ((port->operating_snk_mw * 1000) % op_ma)
3415                                 ++out_mv;
3416                         out_mv += RDO_PROG_VOLT_MV_STEP -
3417                                   (out_mv % RDO_PROG_VOLT_MV_STEP);
3418
3419                         if (out_mv > max_mv) {
3420                                 tcpm_log(port, "Invalid PPS APDO selected!");
3421                                 return -EINVAL;
3422                         }
3423                 }
3424         }
3425
3426         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3427                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
3428                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3429                  port->polarity);
3430
3431         *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
3432
3433         tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
3434                  src_pdo_index, out_mv, op_ma);
3435
3436         port->pps_data.req_op_curr = op_ma;
3437         port->pps_data.req_out_volt = out_mv;
3438
3439         return 0;
3440 }
3441
3442 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
3443 {
3444         struct pd_message msg;
3445         int ret;
3446         u32 rdo;
3447
3448         ret = tcpm_pd_build_pps_request(port, &rdo);
3449         if (ret < 0)
3450                 return ret;
3451
3452         /* Relax the threshold as voltage will be adjusted right after Accept Message. */
3453         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3454
3455         memset(&msg, 0, sizeof(msg));
3456         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3457                                   port->pwr_role,
3458                                   port->data_role,
3459                                   port->negotiated_rev,
3460                                   port->message_id, 1);
3461         msg.payload[0] = cpu_to_le32(rdo);
3462
3463         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3464 }
3465
3466 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
3467 {
3468         int ret;
3469
3470         if (enable && port->vbus_charge)
3471                 return -EINVAL;
3472
3473         tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
3474
3475         ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
3476         if (ret < 0)
3477                 return ret;
3478
3479         port->vbus_source = enable;
3480         return 0;
3481 }
3482
3483 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
3484 {
3485         int ret;
3486
3487         if (charge && port->vbus_source)
3488                 return -EINVAL;
3489
3490         if (charge != port->vbus_charge) {
3491                 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
3492                 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
3493                                            charge);
3494                 if (ret < 0)
3495                         return ret;
3496         }
3497         port->vbus_charge = charge;
3498         power_supply_changed(port->psy);
3499         return 0;
3500 }
3501
3502 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
3503 {
3504         int ret;
3505
3506         if (!port->tcpc->start_toggling)
3507                 return false;
3508
3509         tcpm_log_force(port, "Start toggling");
3510         ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
3511         return ret == 0;
3512 }
3513
3514 static int tcpm_init_vbus(struct tcpm_port *port)
3515 {
3516         int ret;
3517
3518         ret = port->tcpc->set_vbus(port->tcpc, false, false);
3519         port->vbus_source = false;
3520         port->vbus_charge = false;
3521         return ret;
3522 }
3523
3524 static int tcpm_init_vconn(struct tcpm_port *port)
3525 {
3526         int ret;
3527
3528         ret = port->tcpc->set_vconn(port->tcpc, false);
3529         port->vconn_role = TYPEC_SINK;
3530         return ret;
3531 }
3532
3533 static void tcpm_typec_connect(struct tcpm_port *port)
3534 {
3535         if (!port->connected) {
3536                 /* Make sure we don't report stale identity information */
3537                 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
3538                 port->partner_desc.usb_pd = port->pd_capable;
3539                 if (tcpm_port_is_debug(port))
3540                         port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
3541                 else if (tcpm_port_is_audio(port))
3542                         port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
3543                 else
3544                         port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
3545                 port->partner = typec_register_partner(port->typec_port,
3546                                                        &port->partner_desc);
3547                 port->connected = true;
3548         }
3549 }
3550
3551 static int tcpm_src_attach(struct tcpm_port *port)
3552 {
3553         enum typec_cc_polarity polarity =
3554                                 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
3555                                                          : TYPEC_POLARITY_CC1;
3556         int ret;
3557
3558         if (port->attached)
3559                 return 0;
3560
3561         ret = tcpm_set_polarity(port, polarity);
3562         if (ret < 0)
3563                 return ret;
3564
3565         tcpm_enable_auto_vbus_discharge(port, true);
3566
3567         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, tcpm_data_role_for_source(port));
3568         if (ret < 0)
3569                 return ret;
3570
3571         ret = port->tcpc->set_pd_rx(port->tcpc, true);
3572         if (ret < 0)
3573                 goto out_disable_mux;
3574
3575         /*
3576          * USB Type-C specification, version 1.2,
3577          * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
3578          * Enable VCONN only if the non-RD port is set to RA.
3579          */
3580         if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
3581             (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
3582                 ret = tcpm_set_vconn(port, true);
3583                 if (ret < 0)
3584                         goto out_disable_pd;
3585         }
3586
3587         ret = tcpm_set_vbus(port, true);
3588         if (ret < 0)
3589                 goto out_disable_vconn;
3590
3591         port->pd_capable = false;
3592
3593         port->partner = NULL;
3594
3595         port->attached = true;
3596         port->send_discover = true;
3597
3598         return 0;
3599
3600 out_disable_vconn:
3601         tcpm_set_vconn(port, false);
3602 out_disable_pd:
3603         port->tcpc->set_pd_rx(port->tcpc, false);
3604 out_disable_mux:
3605         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3606                      TYPEC_ORIENTATION_NONE);
3607         return ret;
3608 }
3609
3610 static void tcpm_typec_disconnect(struct tcpm_port *port)
3611 {
3612         if (port->connected) {
3613                 typec_unregister_partner(port->partner);
3614                 port->partner = NULL;
3615                 port->connected = false;
3616         }
3617 }
3618
3619 static void tcpm_unregister_altmodes(struct tcpm_port *port)
3620 {
3621         struct pd_mode_data *modep = &port->mode_data;
3622         int i;
3623
3624         for (i = 0; i < modep->altmodes; i++) {
3625                 typec_unregister_altmode(port->partner_altmode[i]);
3626                 port->partner_altmode[i] = NULL;
3627         }
3628
3629         memset(modep, 0, sizeof(*modep));
3630 }
3631
3632 static void tcpm_set_partner_usb_comm_capable(struct tcpm_port *port, bool capable)
3633 {
3634         tcpm_log(port, "Setting usb_comm capable %s", capable ? "true" : "false");
3635
3636         if (port->tcpc->set_partner_usb_comm_capable)
3637                 port->tcpc->set_partner_usb_comm_capable(port->tcpc, capable);
3638 }
3639
3640 static void tcpm_reset_port(struct tcpm_port *port)
3641 {
3642         tcpm_enable_auto_vbus_discharge(port, false);
3643         port->in_ams = false;
3644         port->ams = NONE_AMS;
3645         port->vdm_sm_running = false;
3646         tcpm_unregister_altmodes(port);
3647         tcpm_typec_disconnect(port);
3648         port->attached = false;
3649         port->pd_capable = false;
3650         port->pps_data.supported = false;
3651         tcpm_set_partner_usb_comm_capable(port, false);
3652
3653         /*
3654          * First Rx ID should be 0; set this to a sentinel of -1 so that
3655          * we can check tcpm_pd_rx_handler() if we had seen it before.
3656          */
3657         port->rx_msgid = -1;
3658
3659         port->tcpc->set_pd_rx(port->tcpc, false);
3660         tcpm_init_vbus(port);   /* also disables charging */
3661         tcpm_init_vconn(port);
3662         tcpm_set_current_limit(port, 0, 0);
3663         tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
3664         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3665                      TYPEC_ORIENTATION_NONE);
3666         tcpm_set_attached_state(port, false);
3667         port->try_src_count = 0;
3668         port->try_snk_count = 0;
3669         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
3670         power_supply_changed(port->psy);
3671         port->nr_sink_caps = 0;
3672         port->sink_cap_done = false;
3673         if (port->tcpc->enable_frs)
3674                 port->tcpc->enable_frs(port->tcpc, false);
3675 }
3676
3677 static void tcpm_detach(struct tcpm_port *port)
3678 {
3679         if (tcpm_port_is_disconnected(port))
3680                 port->hard_reset_count = 0;
3681
3682         if (!port->attached)
3683                 return;
3684
3685         if (port->tcpc->set_bist_data) {
3686                 tcpm_log(port, "disable BIST MODE TESTDATA");
3687                 port->tcpc->set_bist_data(port->tcpc, false);
3688         }
3689
3690         tcpm_reset_port(port);
3691 }
3692
3693 static void tcpm_src_detach(struct tcpm_port *port)
3694 {
3695         tcpm_detach(port);
3696 }
3697
3698 static int tcpm_snk_attach(struct tcpm_port *port)
3699 {
3700         int ret;
3701
3702         if (port->attached)
3703                 return 0;
3704
3705         ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
3706                                 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
3707         if (ret < 0)
3708                 return ret;
3709
3710         tcpm_enable_auto_vbus_discharge(port, true);
3711
3712         ret = tcpm_set_roles(port, true, TYPEC_SINK, tcpm_data_role_for_sink(port));
3713         if (ret < 0)
3714                 return ret;
3715
3716         port->pd_capable = false;
3717
3718         port->partner = NULL;
3719
3720         port->attached = true;
3721         port->send_discover = true;
3722
3723         return 0;
3724 }
3725
3726 static void tcpm_snk_detach(struct tcpm_port *port)
3727 {
3728         tcpm_detach(port);
3729 }
3730
3731 static int tcpm_acc_attach(struct tcpm_port *port)
3732 {
3733         int ret;
3734
3735         if (port->attached)
3736                 return 0;
3737
3738         ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
3739                              tcpm_data_role_for_source(port));
3740         if (ret < 0)
3741                 return ret;
3742
3743         port->partner = NULL;
3744
3745         tcpm_typec_connect(port);
3746
3747         port->attached = true;
3748
3749         return 0;
3750 }
3751
3752 static void tcpm_acc_detach(struct tcpm_port *port)
3753 {
3754         tcpm_detach(port);
3755 }
3756
3757 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
3758 {
3759         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
3760                 return HARD_RESET_SEND;
3761         if (port->pd_capable)
3762                 return ERROR_RECOVERY;
3763         if (port->pwr_role == TYPEC_SOURCE)
3764                 return SRC_UNATTACHED;
3765         if (port->state == SNK_WAIT_CAPABILITIES)
3766                 return SNK_READY;
3767         return SNK_UNATTACHED;
3768 }
3769
3770 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
3771 {
3772         if (port->port_type == TYPEC_PORT_DRP) {
3773                 if (port->pwr_role == TYPEC_SOURCE)
3774                         return SRC_UNATTACHED;
3775                 else
3776                         return SNK_UNATTACHED;
3777         } else if (port->port_type == TYPEC_PORT_SRC) {
3778                 return SRC_UNATTACHED;
3779         }
3780
3781         return SNK_UNATTACHED;
3782 }
3783
3784 static void tcpm_swap_complete(struct tcpm_port *port, int result)
3785 {
3786         if (port->swap_pending) {
3787                 port->swap_status = result;
3788                 port->swap_pending = false;
3789                 port->non_pd_role_swap = false;
3790                 complete(&port->swap_complete);
3791         }
3792 }
3793
3794 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
3795 {
3796         switch (cc) {
3797         case TYPEC_CC_RP_1_5:
3798                 return TYPEC_PWR_MODE_1_5A;
3799         case TYPEC_CC_RP_3_0:
3800                 return TYPEC_PWR_MODE_3_0A;
3801         case TYPEC_CC_RP_DEF:
3802         default:
3803                 return TYPEC_PWR_MODE_USB;
3804         }
3805 }
3806
3807 static void run_state_machine(struct tcpm_port *port)
3808 {
3809         int ret;
3810         enum typec_pwr_opmode opmode;
3811         unsigned int msecs;
3812         enum tcpm_state upcoming_state;
3813
3814         port->enter_state = port->state;
3815         switch (port->state) {
3816         case TOGGLING:
3817                 break;
3818         /* SRC states */
3819         case SRC_UNATTACHED:
3820                 if (!port->non_pd_role_swap)
3821                         tcpm_swap_complete(port, -ENOTCONN);
3822                 tcpm_src_detach(port);
3823                 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
3824                         tcpm_set_state(port, TOGGLING, 0);
3825                         break;
3826                 }
3827                 tcpm_set_cc(port, tcpm_rp_cc(port));
3828                 if (port->port_type == TYPEC_PORT_DRP)
3829                         tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
3830                 break;
3831         case SRC_ATTACH_WAIT:
3832                 if (tcpm_port_is_debug(port))
3833                         tcpm_set_state(port, DEBUG_ACC_ATTACHED,
3834                                        PD_T_CC_DEBOUNCE);
3835                 else if (tcpm_port_is_audio(port))
3836                         tcpm_set_state(port, AUDIO_ACC_ATTACHED,
3837                                        PD_T_CC_DEBOUNCE);
3838                 else if (tcpm_port_is_source(port) && port->vbus_vsafe0v)
3839                         tcpm_set_state(port,
3840                                        tcpm_try_snk(port) ? SNK_TRY
3841                                                           : SRC_ATTACHED,
3842                                        PD_T_CC_DEBOUNCE);
3843                 break;
3844
3845         case SNK_TRY:
3846                 port->try_snk_count++;
3847                 /*
3848                  * Requirements:
3849                  * - Do not drive vconn or vbus
3850                  * - Terminate CC pins (both) to Rd
3851                  * Action:
3852                  * - Wait for tDRPTry (PD_T_DRP_TRY).
3853                  *   Until then, ignore any state changes.
3854                  */
3855                 tcpm_set_cc(port, TYPEC_CC_RD);
3856                 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
3857                 break;
3858         case SNK_TRY_WAIT:
3859                 if (tcpm_port_is_sink(port)) {
3860                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
3861                 } else {
3862                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3863                         port->max_wait = 0;
3864                 }
3865                 break;
3866         case SNK_TRY_WAIT_DEBOUNCE:
3867                 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
3868                                PD_T_TRY_CC_DEBOUNCE);
3869                 break;
3870         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
3871                 if (port->vbus_present && tcpm_port_is_sink(port))
3872                         tcpm_set_state(port, SNK_ATTACHED, 0);
3873                 else
3874                         port->max_wait = 0;
3875                 break;
3876         case SRC_TRYWAIT:
3877                 tcpm_set_cc(port, tcpm_rp_cc(port));
3878                 if (port->max_wait == 0) {
3879                         port->max_wait = jiffies +
3880                                          msecs_to_jiffies(PD_T_DRP_TRY);
3881                         tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3882                                        PD_T_DRP_TRY);
3883                 } else {
3884                         if (time_is_after_jiffies(port->max_wait))
3885                                 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3886                                                jiffies_to_msecs(port->max_wait -
3887                                                                 jiffies));
3888                         else
3889                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
3890                 }
3891                 break;
3892         case SRC_TRYWAIT_DEBOUNCE:
3893                 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
3894                 break;
3895         case SRC_TRYWAIT_UNATTACHED:
3896                 tcpm_set_state(port, SNK_UNATTACHED, 0);
3897                 break;
3898
3899         case SRC_ATTACHED:
3900                 ret = tcpm_src_attach(port);
3901                 tcpm_set_state(port, SRC_UNATTACHED,
3902                                ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
3903                 break;
3904         case SRC_STARTUP:
3905                 opmode =  tcpm_get_pwr_opmode(tcpm_rp_cc(port));
3906                 typec_set_pwr_opmode(port->typec_port, opmode);
3907                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
3908                 port->caps_count = 0;
3909                 port->negotiated_rev = PD_MAX_REV;
3910                 port->message_id = 0;
3911                 port->rx_msgid = -1;
3912                 port->explicit_contract = false;
3913                 /* SNK -> SRC POWER/FAST_ROLE_SWAP finished */
3914                 if (port->ams == POWER_ROLE_SWAP ||
3915                     port->ams == FAST_ROLE_SWAP)
3916                         tcpm_ams_finish(port);
3917                 port->upcoming_state = SRC_SEND_CAPABILITIES;
3918                 tcpm_ams_start(port, POWER_NEGOTIATION);
3919                 break;
3920         case SRC_SEND_CAPABILITIES:
3921                 port->caps_count++;
3922                 if (port->caps_count > PD_N_CAPS_COUNT) {
3923                         tcpm_set_state(port, SRC_READY, 0);
3924                         break;
3925                 }
3926                 ret = tcpm_pd_send_source_caps(port);
3927                 if (ret < 0) {
3928                         tcpm_set_state(port, SRC_SEND_CAPABILITIES,
3929                                        PD_T_SEND_SOURCE_CAP);
3930                 } else {
3931                         /*
3932                          * Per standard, we should clear the reset counter here.
3933                          * However, that can result in state machine hang-ups.
3934                          * Reset it only in READY state to improve stability.
3935                          */
3936                         /* port->hard_reset_count = 0; */
3937                         port->caps_count = 0;
3938                         port->pd_capable = true;
3939                         tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
3940                                             PD_T_SEND_SOURCE_CAP);
3941                 }
3942                 break;
3943         case SRC_SEND_CAPABILITIES_TIMEOUT:
3944                 /*
3945                  * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
3946                  *
3947                  * PD 2.0 sinks are supposed to accept src-capabilities with a
3948                  * 3.0 header and simply ignore any src PDOs which the sink does
3949                  * not understand such as PPS but some 2.0 sinks instead ignore
3950                  * the entire PD_DATA_SOURCE_CAP message, causing contract
3951                  * negotiation to fail.
3952                  *
3953                  * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
3954                  * sending src-capabilities with a lower PD revision to
3955                  * make these broken sinks work.
3956                  */
3957                 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
3958                         tcpm_set_state(port, HARD_RESET_SEND, 0);
3959                 } else if (port->negotiated_rev > PD_REV20) {
3960                         port->negotiated_rev--;
3961                         port->hard_reset_count = 0;
3962                         tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3963                 } else {
3964                         tcpm_set_state(port, hard_reset_state(port), 0);
3965                 }
3966                 break;
3967         case SRC_NEGOTIATE_CAPABILITIES:
3968                 ret = tcpm_pd_check_request(port);
3969                 if (ret < 0) {
3970                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
3971                         if (!port->explicit_contract) {
3972                                 tcpm_set_state(port,
3973                                                SRC_WAIT_NEW_CAPABILITIES, 0);
3974                         } else {
3975                                 tcpm_set_state(port, SRC_READY, 0);
3976                         }
3977                 } else {
3978                         tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3979                         tcpm_set_partner_usb_comm_capable(port,
3980                                                           !!(port->sink_request & RDO_USB_COMM));
3981                         tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
3982                                        PD_T_SRC_TRANSITION);
3983                 }
3984                 break;
3985         case SRC_TRANSITION_SUPPLY:
3986                 /* XXX: regulator_set_voltage(vbus, ...) */
3987                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3988                 port->explicit_contract = true;
3989                 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
3990                 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3991                 tcpm_set_state_cond(port, SRC_READY, 0);
3992                 break;
3993         case SRC_READY:
3994 #if 1
3995                 port->hard_reset_count = 0;
3996 #endif
3997                 port->try_src_count = 0;
3998
3999                 tcpm_swap_complete(port, 0);
4000                 tcpm_typec_connect(port);
4001
4002                 if (port->ams != NONE_AMS)
4003                         tcpm_ams_finish(port);
4004                 if (port->next_ams != NONE_AMS) {
4005                         port->ams = port->next_ams;
4006                         port->next_ams = NONE_AMS;
4007                 }
4008
4009                 /*
4010                  * If previous AMS is interrupted, switch to the upcoming
4011                  * state.
4012                  */
4013                 if (port->upcoming_state != INVALID_STATE) {
4014                         upcoming_state = port->upcoming_state;
4015                         port->upcoming_state = INVALID_STATE;
4016                         tcpm_set_state(port, upcoming_state, 0);
4017                         break;
4018                 }
4019
4020                 /*
4021                  * 6.4.4.3.1 Discover Identity
4022                  * "The Discover Identity Command Shall only be sent to SOP when there is an
4023                  * Explicit Contract."
4024                  * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4025                  * port->explicit_contract to decide whether to send the command.
4026                  */
4027                 if (port->explicit_contract)
4028                         mod_send_discover_delayed_work(port, 0);
4029                 else
4030                         port->send_discover = false;
4031
4032                 /*
4033                  * 6.3.5
4034                  * Sending ping messages is not necessary if
4035                  * - the source operates at vSafe5V
4036                  * or
4037                  * - The system is not operating in PD mode
4038                  * or
4039                  * - Both partners are connected using a Type-C connector
4040                  *
4041                  * There is no actual need to send PD messages since the local
4042                  * port type-c and the spec does not clearly say whether PD is
4043                  * possible when type-c is connected to Type-A/B
4044                  */
4045                 break;
4046         case SRC_WAIT_NEW_CAPABILITIES:
4047                 /* Nothing to do... */
4048                 break;
4049
4050         /* SNK states */
4051         case SNK_UNATTACHED:
4052                 if (!port->non_pd_role_swap)
4053                         tcpm_swap_complete(port, -ENOTCONN);
4054                 tcpm_pps_complete(port, -ENOTCONN);
4055                 tcpm_snk_detach(port);
4056                 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
4057                         tcpm_set_state(port, TOGGLING, 0);
4058                         break;
4059                 }
4060                 tcpm_set_cc(port, TYPEC_CC_RD);
4061                 if (port->port_type == TYPEC_PORT_DRP)
4062                         tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
4063                 break;
4064         case SNK_ATTACH_WAIT:
4065                 if ((port->cc1 == TYPEC_CC_OPEN &&
4066                      port->cc2 != TYPEC_CC_OPEN) ||
4067                     (port->cc1 != TYPEC_CC_OPEN &&
4068                      port->cc2 == TYPEC_CC_OPEN))
4069                         tcpm_set_state(port, SNK_DEBOUNCED,
4070                                        PD_T_CC_DEBOUNCE);
4071                 else if (tcpm_port_is_disconnected(port))
4072                         tcpm_set_state(port, SNK_UNATTACHED,
4073                                        PD_T_PD_DEBOUNCE);
4074                 break;
4075         case SNK_DEBOUNCED:
4076                 if (tcpm_port_is_disconnected(port))
4077                         tcpm_set_state(port, SNK_UNATTACHED,
4078                                        PD_T_PD_DEBOUNCE);
4079                 else if (port->vbus_present)
4080                         tcpm_set_state(port,
4081                                        tcpm_try_src(port) ? SRC_TRY
4082                                                           : SNK_ATTACHED,
4083                                        0);
4084                 else
4085                         /* Wait for VBUS, but not forever */
4086                         tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
4087                 break;
4088
4089         case SRC_TRY:
4090                 port->try_src_count++;
4091                 tcpm_set_cc(port, tcpm_rp_cc(port));
4092                 port->max_wait = 0;
4093                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
4094                 break;
4095         case SRC_TRY_WAIT:
4096                 if (port->max_wait == 0) {
4097                         port->max_wait = jiffies +
4098                                          msecs_to_jiffies(PD_T_DRP_TRY);
4099                         msecs = PD_T_DRP_TRY;
4100                 } else {
4101                         if (time_is_after_jiffies(port->max_wait))
4102                                 msecs = jiffies_to_msecs(port->max_wait -
4103                                                          jiffies);
4104                         else
4105                                 msecs = 0;
4106                 }
4107                 tcpm_set_state(port, SNK_TRYWAIT, msecs);
4108                 break;
4109         case SRC_TRY_DEBOUNCE:
4110                 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
4111                 break;
4112         case SNK_TRYWAIT:
4113                 tcpm_set_cc(port, TYPEC_CC_RD);
4114                 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
4115                 break;
4116         case SNK_TRYWAIT_VBUS:
4117                 /*
4118                  * TCPM stays in this state indefinitely until VBUS
4119                  * is detected as long as Rp is not detected for
4120                  * more than a time period of tPDDebounce.
4121                  */
4122                 if (port->vbus_present && tcpm_port_is_sink(port)) {
4123                         tcpm_set_state(port, SNK_ATTACHED, 0);
4124                         break;
4125                 }
4126                 if (!tcpm_port_is_sink(port))
4127                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4128                 break;
4129         case SNK_TRYWAIT_DEBOUNCE:
4130                 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
4131                 break;
4132         case SNK_ATTACHED:
4133                 ret = tcpm_snk_attach(port);
4134                 if (ret < 0)
4135                         tcpm_set_state(port, SNK_UNATTACHED, 0);
4136                 else
4137                         tcpm_set_state(port, SNK_STARTUP, 0);
4138                 break;
4139         case SNK_STARTUP:
4140                 opmode =  tcpm_get_pwr_opmode(port->polarity ?
4141                                               port->cc2 : port->cc1);
4142                 typec_set_pwr_opmode(port->typec_port, opmode);
4143                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
4144                 port->negotiated_rev = PD_MAX_REV;
4145                 port->message_id = 0;
4146                 port->rx_msgid = -1;
4147                 port->explicit_contract = false;
4148
4149                 if (port->ams == POWER_ROLE_SWAP ||
4150                     port->ams == FAST_ROLE_SWAP)
4151                         /* SRC -> SNK POWER/FAST_ROLE_SWAP finished */
4152                         tcpm_ams_finish(port);
4153
4154                 tcpm_set_state(port, SNK_DISCOVERY, 0);
4155                 break;
4156         case SNK_DISCOVERY:
4157                 if (port->vbus_present) {
4158                         u32 current_lim = tcpm_get_current_limit(port);
4159
4160                         if (port->slow_charger_loop && (current_lim > PD_P_SNK_STDBY_MW / 5))
4161                                 current_lim = PD_P_SNK_STDBY_MW / 5;
4162                         tcpm_set_current_limit(port, current_lim, 5000);
4163                         tcpm_set_charge(port, true);
4164                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4165                         break;
4166                 }
4167                 /*
4168                  * For DRP, timeouts differ. Also, handling is supposed to be
4169                  * different and much more complex (dead battery detection;
4170                  * see USB power delivery specification, section 8.3.3.6.1.5.1).
4171                  */
4172                 tcpm_set_state(port, hard_reset_state(port),
4173                                port->port_type == TYPEC_PORT_DRP ?
4174                                         PD_T_DB_DETECT : PD_T_NO_RESPONSE);
4175                 break;
4176         case SNK_DISCOVERY_DEBOUNCE:
4177                 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
4178                                PD_T_CC_DEBOUNCE);
4179                 break;
4180         case SNK_DISCOVERY_DEBOUNCE_DONE:
4181                 if (!tcpm_port_is_disconnected(port) &&
4182                     tcpm_port_is_sink(port) &&
4183                     ktime_after(port->delayed_runtime, ktime_get())) {
4184                         tcpm_set_state(port, SNK_DISCOVERY,
4185                                        ktime_to_ms(ktime_sub(port->delayed_runtime, ktime_get())));
4186                         break;
4187                 }
4188                 tcpm_set_state(port, unattached_state(port), 0);
4189                 break;
4190         case SNK_WAIT_CAPABILITIES:
4191                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
4192                 if (ret < 0) {
4193                         tcpm_set_state(port, SNK_READY, 0);
4194                         break;
4195                 }
4196                 /*
4197                  * If VBUS has never been low, and we time out waiting
4198                  * for source cap, try a soft reset first, in case we
4199                  * were already in a stable contract before this boot.
4200                  * Do this only once.
4201                  */
4202                 if (port->vbus_never_low) {
4203                         port->vbus_never_low = false;
4204                         tcpm_set_state(port, SNK_SOFT_RESET,
4205                                        PD_T_SINK_WAIT_CAP);
4206                 } else {
4207                         tcpm_set_state(port, hard_reset_state(port),
4208                                        PD_T_SINK_WAIT_CAP);
4209                 }
4210                 break;
4211         case SNK_NEGOTIATE_CAPABILITIES:
4212                 port->pd_capable = true;
4213                 tcpm_set_partner_usb_comm_capable(port,
4214                                                   !!(port->source_caps[0] & PDO_FIXED_USB_COMM));
4215                 port->hard_reset_count = 0;
4216                 ret = tcpm_pd_send_request(port);
4217                 if (ret < 0) {
4218                         /* Restore back to the original state */
4219                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4220                                                                port->pps_data.active,
4221                                                                port->supply_voltage);
4222                         /* Let the Source send capabilities again. */
4223                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4224                 } else {
4225                         tcpm_set_state_cond(port, hard_reset_state(port),
4226                                             PD_T_SENDER_RESPONSE);
4227                 }
4228                 break;
4229         case SNK_NEGOTIATE_PPS_CAPABILITIES:
4230                 ret = tcpm_pd_send_pps_request(port);
4231                 if (ret < 0) {
4232                         /* Restore back to the original state */
4233                         tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4234                                                                port->pps_data.active,
4235                                                                port->supply_voltage);
4236                         port->pps_status = ret;
4237                         /*
4238                          * If this was called due to updates to sink
4239                          * capabilities, and pps is no longer valid, we should
4240                          * safely fall back to a standard PDO.
4241                          */
4242                         if (port->update_sink_caps)
4243                                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4244                         else
4245                                 tcpm_set_state(port, SNK_READY, 0);
4246                 } else {
4247                         tcpm_set_state_cond(port, hard_reset_state(port),
4248                                             PD_T_SENDER_RESPONSE);
4249                 }
4250                 break;
4251         case SNK_TRANSITION_SINK:
4252                 /* From the USB PD spec:
4253                  * "The Sink Shall transition to Sink Standby before a positive or
4254                  * negative voltage transition of VBUS. During Sink Standby
4255                  * the Sink Shall reduce its power draw to pSnkStdby."
4256                  *
4257                  * This is not applicable to PPS though as the port can continue
4258                  * to draw negotiated power without switching to standby.
4259                  */
4260                 if (port->supply_voltage != port->req_supply_voltage && !port->pps_data.active &&
4261                     port->current_limit * port->supply_voltage / 1000 > PD_P_SNK_STDBY_MW) {
4262                         u32 stdby_ma = PD_P_SNK_STDBY_MW * 1000 / port->supply_voltage;
4263
4264                         tcpm_log(port, "Setting standby current %u mV @ %u mA",
4265                                  port->supply_voltage, stdby_ma);
4266                         tcpm_set_current_limit(port, stdby_ma, port->supply_voltage);
4267                 }
4268                 fallthrough;
4269         case SNK_TRANSITION_SINK_VBUS:
4270                 tcpm_set_state(port, hard_reset_state(port),
4271                                PD_T_PS_TRANSITION);
4272                 break;
4273         case SNK_READY:
4274                 port->try_snk_count = 0;
4275                 port->update_sink_caps = false;
4276                 if (port->explicit_contract) {
4277                         typec_set_pwr_opmode(port->typec_port,
4278                                              TYPEC_PWR_MODE_PD);
4279                         port->pwr_opmode = TYPEC_PWR_MODE_PD;
4280                 }
4281
4282                 if (!port->pd_capable && port->slow_charger_loop)
4283                         tcpm_set_current_limit(port, tcpm_get_current_limit(port), 5000);
4284                 tcpm_swap_complete(port, 0);
4285                 tcpm_typec_connect(port);
4286                 mod_enable_frs_delayed_work(port, 0);
4287                 tcpm_pps_complete(port, port->pps_status);
4288
4289                 if (port->ams != NONE_AMS)
4290                         tcpm_ams_finish(port);
4291                 if (port->next_ams != NONE_AMS) {
4292                         port->ams = port->next_ams;
4293                         port->next_ams = NONE_AMS;
4294                 }
4295
4296                 /*
4297                  * If previous AMS is interrupted, switch to the upcoming
4298                  * state.
4299                  */
4300                 if (port->upcoming_state != INVALID_STATE) {
4301                         upcoming_state = port->upcoming_state;
4302                         port->upcoming_state = INVALID_STATE;
4303                         tcpm_set_state(port, upcoming_state, 0);
4304                         break;
4305                 }
4306
4307                 /*
4308                  * 6.4.4.3.1 Discover Identity
4309                  * "The Discover Identity Command Shall only be sent to SOP when there is an
4310                  * Explicit Contract."
4311                  * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4312                  * port->explicit_contract.
4313                  */
4314                 if (port->explicit_contract)
4315                         mod_send_discover_delayed_work(port, 0);
4316                 else
4317                         port->send_discover = false;
4318
4319                 power_supply_changed(port->psy);
4320                 break;
4321
4322         /* Accessory states */
4323         case ACC_UNATTACHED:
4324                 tcpm_acc_detach(port);
4325                 tcpm_set_state(port, SRC_UNATTACHED, 0);
4326                 break;
4327         case DEBUG_ACC_ATTACHED:
4328         case AUDIO_ACC_ATTACHED:
4329                 ret = tcpm_acc_attach(port);
4330                 if (ret < 0)
4331                         tcpm_set_state(port, ACC_UNATTACHED, 0);
4332                 break;
4333         case AUDIO_ACC_DEBOUNCE:
4334                 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
4335                 break;
4336
4337         /* Hard_Reset states */
4338         case HARD_RESET_SEND:
4339                 if (port->ams != NONE_AMS)
4340                         tcpm_ams_finish(port);
4341                 /*
4342                  * State machine will be directed to HARD_RESET_START,
4343                  * thus set upcoming_state to INVALID_STATE.
4344                  */
4345                 port->upcoming_state = INVALID_STATE;
4346                 tcpm_ams_start(port, HARD_RESET);
4347                 break;
4348         case HARD_RESET_START:
4349                 port->sink_cap_done = false;
4350                 if (port->tcpc->enable_frs)
4351                         port->tcpc->enable_frs(port->tcpc, false);
4352                 port->hard_reset_count++;
4353                 port->tcpc->set_pd_rx(port->tcpc, false);
4354                 tcpm_unregister_altmodes(port);
4355                 port->nr_sink_caps = 0;
4356                 port->send_discover = true;
4357                 if (port->pwr_role == TYPEC_SOURCE)
4358                         tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
4359                                        PD_T_PS_HARD_RESET);
4360                 else
4361                         tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
4362                 break;
4363         case SRC_HARD_RESET_VBUS_OFF:
4364                 /*
4365                  * 7.1.5 Response to Hard Resets
4366                  * Hard Reset Signaling indicates a communication failure has occurred and the
4367                  * Source Shall stop driving VCONN, Shall remove Rp from the VCONN pin and Shall
4368                  * drive VBUS to vSafe0V as shown in Figure 7-9.
4369                  */
4370                 tcpm_set_vconn(port, false);
4371                 tcpm_set_vbus(port, false);
4372                 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
4373                                tcpm_data_role_for_source(port));
4374                 /*
4375                  * If tcpc fails to notify vbus off, TCPM will wait for PD_T_SAFE_0V +
4376                  * PD_T_SRC_RECOVER before turning vbus back on.
4377                  * From Table 7-12 Sequence Description for a Source Initiated Hard Reset:
4378                  * 4. Policy Engine waits tPSHardReset after sending Hard Reset Signaling and then
4379                  * tells the Device Policy Manager to instruct the power supply to perform a
4380                  * Hard Reset. The transition to vSafe0V Shall occur within tSafe0V (t2).
4381                  * 5. After tSrcRecover the Source applies power to VBUS in an attempt to
4382                  * re-establish communication with the Sink and resume USB Default Operation.
4383                  * The transition to vSafe5V Shall occur within tSrcTurnOn(t4).
4384                  */
4385                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SAFE_0V + PD_T_SRC_RECOVER);
4386                 break;
4387         case SRC_HARD_RESET_VBUS_ON:
4388                 tcpm_set_vconn(port, true);
4389                 tcpm_set_vbus(port, true);
4390                 if (port->ams == HARD_RESET)
4391                         tcpm_ams_finish(port);
4392                 port->tcpc->set_pd_rx(port->tcpc, true);
4393                 tcpm_set_attached_state(port, true);
4394                 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
4395                 break;
4396         case SNK_HARD_RESET_SINK_OFF:
4397                 /* Do not discharge/disconnect during hard reseet */
4398                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
4399                 memset(&port->pps_data, 0, sizeof(port->pps_data));
4400                 tcpm_set_vconn(port, false);
4401                 if (port->pd_capable)
4402                         tcpm_set_charge(port, false);
4403                 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
4404                                tcpm_data_role_for_sink(port));
4405                 /*
4406                  * VBUS may or may not toggle, depending on the adapter.
4407                  * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
4408                  * directly after timeout.
4409                  */
4410                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
4411                 break;
4412         case SNK_HARD_RESET_WAIT_VBUS:
4413                 if (port->ams == HARD_RESET)
4414                         tcpm_ams_finish(port);
4415                 /* Assume we're disconnected if VBUS doesn't come back. */
4416                 tcpm_set_state(port, SNK_UNATTACHED,
4417                                PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
4418                 break;
4419         case SNK_HARD_RESET_SINK_ON:
4420                 /* Note: There is no guarantee that VBUS is on in this state */
4421                 /*
4422                  * XXX:
4423                  * The specification suggests that dual mode ports in sink
4424                  * mode should transition to state PE_SRC_Transition_to_default.
4425                  * See USB power delivery specification chapter 8.3.3.6.1.3.
4426                  * This would mean to to
4427                  * - turn off VCONN, reset power supply
4428                  * - request hardware reset
4429                  * - turn on VCONN
4430                  * - Transition to state PE_Src_Startup
4431                  * SNK only ports shall transition to state Snk_Startup
4432                  * (see chapter 8.3.3.3.8).
4433                  * Similar, dual-mode ports in source mode should transition
4434                  * to PE_SNK_Transition_to_default.
4435                  */
4436                 if (port->pd_capable) {
4437                         tcpm_set_current_limit(port,
4438                                                tcpm_get_current_limit(port),
4439                                                5000);
4440                         tcpm_set_charge(port, true);
4441                 }
4442                 if (port->ams == HARD_RESET)
4443                         tcpm_ams_finish(port);
4444                 tcpm_set_attached_state(port, true);
4445                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4446                 tcpm_set_state(port, SNK_STARTUP, 0);
4447                 break;
4448
4449         /* Soft_Reset states */
4450         case SOFT_RESET:
4451                 port->message_id = 0;
4452                 port->rx_msgid = -1;
4453                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4454                 tcpm_ams_finish(port);
4455                 if (port->pwr_role == TYPEC_SOURCE) {
4456                         port->upcoming_state = SRC_SEND_CAPABILITIES;
4457                         tcpm_ams_start(port, POWER_NEGOTIATION);
4458                 } else {
4459                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4460                 }
4461                 break;
4462         case SRC_SOFT_RESET_WAIT_SNK_TX:
4463         case SNK_SOFT_RESET:
4464                 if (port->ams != NONE_AMS)
4465                         tcpm_ams_finish(port);
4466                 port->upcoming_state = SOFT_RESET_SEND;
4467                 tcpm_ams_start(port, SOFT_RESET_AMS);
4468                 break;
4469         case SOFT_RESET_SEND:
4470                 port->message_id = 0;
4471                 port->rx_msgid = -1;
4472                 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
4473                         tcpm_set_state_cond(port, hard_reset_state(port), 0);
4474                 else
4475                         tcpm_set_state_cond(port, hard_reset_state(port),
4476                                             PD_T_SENDER_RESPONSE);
4477                 break;
4478
4479         /* DR_Swap states */
4480         case DR_SWAP_SEND:
4481                 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
4482                 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
4483                                     PD_T_SENDER_RESPONSE);
4484                 break;
4485         case DR_SWAP_ACCEPT:
4486                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4487                 /* Set VDM state machine running flag ASAP */
4488                 if (port->data_role == TYPEC_DEVICE && port->send_discover)
4489                         port->vdm_sm_running = true;
4490                 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
4491                 break;
4492         case DR_SWAP_SEND_TIMEOUT:
4493                 tcpm_swap_complete(port, -ETIMEDOUT);
4494                 tcpm_ams_finish(port);
4495                 tcpm_set_state(port, ready_state(port), 0);
4496                 break;
4497         case DR_SWAP_CHANGE_DR:
4498                 if (port->data_role == TYPEC_HOST) {
4499                         tcpm_unregister_altmodes(port);
4500                         tcpm_set_roles(port, true, port->pwr_role,
4501                                        TYPEC_DEVICE);
4502                 } else {
4503                         tcpm_set_roles(port, true, port->pwr_role,
4504                                        TYPEC_HOST);
4505                         port->send_discover = true;
4506                 }
4507                 tcpm_ams_finish(port);
4508                 tcpm_set_state(port, ready_state(port), 0);
4509                 break;
4510
4511         case FR_SWAP_SEND:
4512                 if (tcpm_pd_send_control(port, PD_CTRL_FR_SWAP)) {
4513                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4514                         break;
4515                 }
4516                 tcpm_set_state_cond(port, FR_SWAP_SEND_TIMEOUT, PD_T_SENDER_RESPONSE);
4517                 break;
4518         case FR_SWAP_SEND_TIMEOUT:
4519                 tcpm_set_state(port, ERROR_RECOVERY, 0);
4520                 break;
4521         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4522                 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_OFF);
4523                 break;
4524         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4525                 if (port->vbus_source)
4526                         tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
4527                 else
4528                         tcpm_set_state(port, ERROR_RECOVERY, PD_T_RECEIVER_RESPONSE);
4529                 break;
4530         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4531                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4532                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4533                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4534                         break;
4535                 }
4536                 tcpm_set_cc(port, tcpm_rp_cc(port));
4537                 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4538                 break;
4539
4540         /* PR_Swap states */
4541         case PR_SWAP_ACCEPT:
4542                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4543                 tcpm_set_state(port, PR_SWAP_START, 0);
4544                 break;
4545         case PR_SWAP_SEND:
4546                 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
4547                 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
4548                                     PD_T_SENDER_RESPONSE);
4549                 break;
4550         case PR_SWAP_SEND_TIMEOUT:
4551                 tcpm_swap_complete(port, -ETIMEDOUT);
4552                 tcpm_set_state(port, ready_state(port), 0);
4553                 break;
4554         case PR_SWAP_START:
4555                 tcpm_apply_rc(port);
4556                 if (port->pwr_role == TYPEC_SOURCE)
4557                         tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
4558                                        PD_T_SRC_TRANSITION);
4559                 else
4560                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
4561                 break;
4562         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4563                 /*
4564                  * Prevent vbus discharge circuit from turning on during PR_SWAP
4565                  * as this is not a disconnect.
4566                  */
4567                 tcpm_set_vbus(port, false);
4568                 port->explicit_contract = false;
4569                 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
4570                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
4571                                PD_T_SRCSWAPSTDBY);
4572                 break;
4573         case PR_SWAP_SRC_SNK_SOURCE_OFF:
4574                 tcpm_set_cc(port, TYPEC_CC_RD);
4575                 /* allow CC debounce */
4576                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
4577                                PD_T_CC_DEBOUNCE);
4578                 break;
4579         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
4580                 /*
4581                  * USB-PD standard, 6.2.1.4, Port Power Role:
4582                  * "During the Power Role Swap Sequence, for the initial Source
4583                  * Port, the Port Power Role field shall be set to Sink in the
4584                  * PS_RDY Message indicating that the initial Source’s power
4585                  * supply is turned off"
4586                  */
4587                 tcpm_set_pwr_role(port, TYPEC_SINK);
4588                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4589                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4590                         break;
4591                 }
4592                 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON_PRS);
4593                 break;
4594         case PR_SWAP_SRC_SNK_SINK_ON:
4595                 tcpm_enable_auto_vbus_discharge(port, true);
4596                 /* Set the vbus disconnect threshold for implicit contract */
4597                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4598                 tcpm_set_state(port, SNK_STARTUP, 0);
4599                 break;
4600         case PR_SWAP_SNK_SRC_SINK_OFF:
4601                 /*
4602                  * Prevent vbus discharge circuit from turning on during PR_SWAP
4603                  * as this is not a disconnect.
4604                  */
4605                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB,
4606                                                        port->pps_data.active, 0);
4607                 tcpm_set_charge(port, false);
4608                 tcpm_set_state(port, hard_reset_state(port),
4609                                PD_T_PS_SOURCE_OFF);
4610                 break;
4611         case PR_SWAP_SNK_SRC_SOURCE_ON:
4612                 tcpm_enable_auto_vbus_discharge(port, true);
4613                 tcpm_set_cc(port, tcpm_rp_cc(port));
4614                 tcpm_set_vbus(port, true);
4615                 /*
4616                  * allow time VBUS ramp-up, must be < tNewSrc
4617                  * Also, this window overlaps with CC debounce as well.
4618                  * So, Wait for the max of two which is PD_T_NEWSRC
4619                  */
4620                 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
4621                                PD_T_NEWSRC);
4622                 break;
4623         case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
4624                 /*
4625                  * USB PD standard, 6.2.1.4:
4626                  * "Subsequent Messages initiated by the Policy Engine,
4627                  * such as the PS_RDY Message sent to indicate that Vbus
4628                  * is ready, will have the Port Power Role field set to
4629                  * Source."
4630                  */
4631                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4632                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4633                 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4634                 break;
4635
4636         case VCONN_SWAP_ACCEPT:
4637                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4638                 tcpm_ams_finish(port);
4639                 tcpm_set_state(port, VCONN_SWAP_START, 0);
4640                 break;
4641         case VCONN_SWAP_SEND:
4642                 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
4643                 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
4644                                PD_T_SENDER_RESPONSE);
4645                 break;
4646         case VCONN_SWAP_SEND_TIMEOUT:
4647                 tcpm_swap_complete(port, -ETIMEDOUT);
4648                 if (port->data_role == TYPEC_HOST && port->send_discover)
4649                         port->vdm_sm_running = true;
4650                 tcpm_set_state(port, ready_state(port), 0);
4651                 break;
4652         case VCONN_SWAP_START:
4653                 if (port->vconn_role == TYPEC_SOURCE)
4654                         tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
4655                 else
4656                         tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
4657                 break;
4658         case VCONN_SWAP_WAIT_FOR_VCONN:
4659                 tcpm_set_state(port, hard_reset_state(port),
4660                                PD_T_VCONN_SOURCE_ON);
4661                 break;
4662         case VCONN_SWAP_TURN_ON_VCONN:
4663                 tcpm_set_vconn(port, true);
4664                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4665                 if (port->data_role == TYPEC_HOST && port->send_discover)
4666                         port->vdm_sm_running = true;
4667                 tcpm_set_state(port, ready_state(port), 0);
4668                 break;
4669         case VCONN_SWAP_TURN_OFF_VCONN:
4670                 tcpm_set_vconn(port, false);
4671                 if (port->data_role == TYPEC_HOST && port->send_discover)
4672                         port->vdm_sm_running = true;
4673                 tcpm_set_state(port, ready_state(port), 0);
4674                 break;
4675
4676         case DR_SWAP_CANCEL:
4677         case PR_SWAP_CANCEL:
4678         case VCONN_SWAP_CANCEL:
4679                 tcpm_swap_complete(port, port->swap_status);
4680                 if (port->data_role == TYPEC_HOST && port->send_discover)
4681                         port->vdm_sm_running = true;
4682                 if (port->pwr_role == TYPEC_SOURCE)
4683                         tcpm_set_state(port, SRC_READY, 0);
4684                 else
4685                         tcpm_set_state(port, SNK_READY, 0);
4686                 break;
4687         case FR_SWAP_CANCEL:
4688                 if (port->pwr_role == TYPEC_SOURCE)
4689                         tcpm_set_state(port, SRC_READY, 0);
4690                 else
4691                         tcpm_set_state(port, SNK_READY, 0);
4692                 break;
4693
4694         case BIST_RX:
4695                 switch (BDO_MODE_MASK(port->bist_request)) {
4696                 case BDO_MODE_CARRIER2:
4697                         tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
4698                         tcpm_set_state(port, unattached_state(port),
4699                                        PD_T_BIST_CONT_MODE);
4700                         break;
4701                 case BDO_MODE_TESTDATA:
4702                         if (port->tcpc->set_bist_data) {
4703                                 tcpm_log(port, "Enable BIST MODE TESTDATA");
4704                                 port->tcpc->set_bist_data(port->tcpc, true);
4705                         }
4706                         break;
4707                 default:
4708                         break;
4709                 }
4710                 break;
4711         case GET_STATUS_SEND:
4712                 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
4713                 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
4714                                PD_T_SENDER_RESPONSE);
4715                 break;
4716         case GET_STATUS_SEND_TIMEOUT:
4717                 tcpm_set_state(port, ready_state(port), 0);
4718                 break;
4719         case GET_PPS_STATUS_SEND:
4720                 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
4721                 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
4722                                PD_T_SENDER_RESPONSE);
4723                 break;
4724         case GET_PPS_STATUS_SEND_TIMEOUT:
4725                 tcpm_set_state(port, ready_state(port), 0);
4726                 break;
4727         case GET_SINK_CAP:
4728                 tcpm_pd_send_control(port, PD_CTRL_GET_SINK_CAP);
4729                 tcpm_set_state(port, GET_SINK_CAP_TIMEOUT, PD_T_SENDER_RESPONSE);
4730                 break;
4731         case GET_SINK_CAP_TIMEOUT:
4732                 port->sink_cap_done = true;
4733                 tcpm_set_state(port, ready_state(port), 0);
4734                 break;
4735         case ERROR_RECOVERY:
4736                 tcpm_swap_complete(port, -EPROTO);
4737                 tcpm_pps_complete(port, -EPROTO);
4738                 tcpm_set_state(port, PORT_RESET, 0);
4739                 break;
4740         case PORT_RESET:
4741                 tcpm_reset_port(port);
4742                 tcpm_set_cc(port, TYPEC_CC_OPEN);
4743                 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
4744                                PD_T_ERROR_RECOVERY);
4745                 break;
4746         case PORT_RESET_WAIT_OFF:
4747                 tcpm_set_state(port,
4748                                tcpm_default_state(port),
4749                                port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
4750                 break;
4751
4752         /* AMS intermediate state */
4753         case AMS_START:
4754                 if (port->upcoming_state == INVALID_STATE) {
4755                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
4756                                        SRC_READY : SNK_READY, 0);
4757                         break;
4758                 }
4759
4760                 upcoming_state = port->upcoming_state;
4761                 port->upcoming_state = INVALID_STATE;
4762                 tcpm_set_state(port, upcoming_state, 0);
4763                 break;
4764
4765         /* Chunk state */
4766         case CHUNK_NOT_SUPP:
4767                 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
4768                 tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ? SRC_READY : SNK_READY, 0);
4769                 break;
4770         default:
4771                 WARN(1, "Unexpected port state %d\n", port->state);
4772                 break;
4773         }
4774 }
4775
4776 static void tcpm_state_machine_work(struct kthread_work *work)
4777 {
4778         struct tcpm_port *port = container_of(work, struct tcpm_port, state_machine);
4779         enum tcpm_state prev_state;
4780
4781         mutex_lock(&port->lock);
4782         port->state_machine_running = true;
4783
4784         if (port->queued_message && tcpm_send_queued_message(port))
4785                 goto done;
4786
4787         /* If we were queued due to a delayed state change, update it now */
4788         if (port->delayed_state) {
4789                 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
4790                          tcpm_states[port->state],
4791                          tcpm_states[port->delayed_state], port->delay_ms);
4792                 port->prev_state = port->state;
4793                 port->state = port->delayed_state;
4794                 port->delayed_state = INVALID_STATE;
4795         }
4796
4797         /*
4798          * Continue running as long as we have (non-delayed) state changes
4799          * to make.
4800          */
4801         do {
4802                 prev_state = port->state;
4803                 run_state_machine(port);
4804                 if (port->queued_message)
4805                         tcpm_send_queued_message(port);
4806         } while (port->state != prev_state && !port->delayed_state);
4807
4808 done:
4809         port->state_machine_running = false;
4810         mutex_unlock(&port->lock);
4811 }
4812
4813 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
4814                             enum typec_cc_status cc2)
4815 {
4816         enum typec_cc_status old_cc1, old_cc2;
4817         enum tcpm_state new_state;
4818
4819         old_cc1 = port->cc1;
4820         old_cc2 = port->cc2;
4821         port->cc1 = cc1;
4822         port->cc2 = cc2;
4823
4824         tcpm_log_force(port,
4825                        "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
4826                        old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
4827                        port->polarity,
4828                        tcpm_port_is_disconnected(port) ? "disconnected"
4829                                                        : "connected");
4830
4831         switch (port->state) {
4832         case TOGGLING:
4833                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4834                     tcpm_port_is_source(port))
4835                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4836                 else if (tcpm_port_is_sink(port))
4837                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4838                 break;
4839         case SRC_UNATTACHED:
4840         case ACC_UNATTACHED:
4841                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4842                     tcpm_port_is_source(port))
4843                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4844                 break;
4845         case SRC_ATTACH_WAIT:
4846                 if (tcpm_port_is_disconnected(port) ||
4847                     tcpm_port_is_audio_detached(port))
4848                         tcpm_set_state(port, SRC_UNATTACHED, 0);
4849                 else if (cc1 != old_cc1 || cc2 != old_cc2)
4850                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4851                 break;
4852         case SRC_ATTACHED:
4853         case SRC_SEND_CAPABILITIES:
4854         case SRC_READY:
4855                 if (tcpm_port_is_disconnected(port) ||
4856                     !tcpm_port_is_source(port)) {
4857                         if (port->port_type == TYPEC_PORT_SRC)
4858                                 tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
4859                         else
4860                                 tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
4861                 }
4862                 break;
4863         case SNK_UNATTACHED:
4864                 if (tcpm_port_is_sink(port))
4865                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4866                 break;
4867         case SNK_ATTACH_WAIT:
4868                 if ((port->cc1 == TYPEC_CC_OPEN &&
4869                      port->cc2 != TYPEC_CC_OPEN) ||
4870                     (port->cc1 != TYPEC_CC_OPEN &&
4871                      port->cc2 == TYPEC_CC_OPEN))
4872                         new_state = SNK_DEBOUNCED;
4873                 else if (tcpm_port_is_disconnected(port))
4874                         new_state = SNK_UNATTACHED;
4875                 else
4876                         break;
4877                 if (new_state != port->delayed_state)
4878                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4879                 break;
4880         case SNK_DEBOUNCED:
4881                 if (tcpm_port_is_disconnected(port))
4882                         new_state = SNK_UNATTACHED;
4883                 else if (port->vbus_present)
4884                         new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
4885                 else
4886                         new_state = SNK_UNATTACHED;
4887                 if (new_state != port->delayed_state)
4888                         tcpm_set_state(port, SNK_DEBOUNCED, 0);
4889                 break;
4890         case SNK_READY:
4891                 /*
4892                  * EXIT condition is based primarily on vbus disconnect and CC is secondary.
4893                  * "A port that has entered into USB PD communications with the Source and
4894                  * has seen the CC voltage exceed vRd-USB may monitor the CC pin to detect
4895                  * cable disconnect in addition to monitoring VBUS.
4896                  *
4897                  * A port that is monitoring the CC voltage for disconnect (but is not in
4898                  * the process of a USB PD PR_Swap or USB PD FR_Swap) shall transition to
4899                  * Unattached.SNK within tSinkDisconnect after the CC voltage remains below
4900                  * vRd-USB for tPDDebounce."
4901                  *
4902                  * When set_auto_vbus_discharge_threshold is enabled, CC pins go
4903                  * away before vbus decays to disconnect threshold. Allow
4904                  * disconnect to be driven by vbus disconnect when auto vbus
4905                  * discharge is enabled.
4906                  */
4907                 if (!port->auto_vbus_discharge_enabled && tcpm_port_is_disconnected(port))
4908                         tcpm_set_state(port, unattached_state(port), 0);
4909                 else if (!port->pd_capable &&
4910                          (cc1 != old_cc1 || cc2 != old_cc2))
4911                         tcpm_set_current_limit(port,
4912                                                tcpm_get_current_limit(port),
4913                                                5000);
4914                 break;
4915
4916         case AUDIO_ACC_ATTACHED:
4917                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
4918                         tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
4919                 break;
4920         case AUDIO_ACC_DEBOUNCE:
4921                 if (tcpm_port_is_audio(port))
4922                         tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
4923                 break;
4924
4925         case DEBUG_ACC_ATTACHED:
4926                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
4927                         tcpm_set_state(port, ACC_UNATTACHED, 0);
4928                 break;
4929
4930         case SNK_TRY:
4931                 /* Do nothing, waiting for timeout */
4932                 break;
4933
4934         case SNK_DISCOVERY:
4935                 /* CC line is unstable, wait for debounce */
4936                 if (tcpm_port_is_disconnected(port))
4937                         tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
4938                 break;
4939         case SNK_DISCOVERY_DEBOUNCE:
4940                 break;
4941
4942         case SRC_TRYWAIT:
4943                 /* Hand over to state machine if needed */
4944                 if (!port->vbus_present && tcpm_port_is_source(port))
4945                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
4946                 break;
4947         case SRC_TRYWAIT_DEBOUNCE:
4948                 if (port->vbus_present || !tcpm_port_is_source(port))
4949                         tcpm_set_state(port, SRC_TRYWAIT, 0);
4950                 break;
4951         case SNK_TRY_WAIT_DEBOUNCE:
4952                 if (!tcpm_port_is_sink(port)) {
4953                         port->max_wait = 0;
4954                         tcpm_set_state(port, SRC_TRYWAIT, 0);
4955                 }
4956                 break;
4957         case SRC_TRY_WAIT:
4958                 if (tcpm_port_is_source(port))
4959                         tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
4960                 break;
4961         case SRC_TRY_DEBOUNCE:
4962                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
4963                 break;
4964         case SNK_TRYWAIT_DEBOUNCE:
4965                 if (tcpm_port_is_sink(port))
4966                         tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
4967                 break;
4968         case SNK_TRYWAIT_VBUS:
4969                 if (!tcpm_port_is_sink(port))
4970                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4971                 break;
4972         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
4973                 if (!tcpm_port_is_sink(port))
4974                         tcpm_set_state(port, SRC_TRYWAIT, PD_T_TRY_CC_DEBOUNCE);
4975                 else
4976                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS, 0);
4977                 break;
4978         case SNK_TRYWAIT:
4979                 /* Do nothing, waiting for tCCDebounce */
4980                 break;
4981         case PR_SWAP_SNK_SRC_SINK_OFF:
4982         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4983         case PR_SWAP_SRC_SNK_SOURCE_OFF:
4984         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
4985         case PR_SWAP_SNK_SRC_SOURCE_ON:
4986                 /*
4987                  * CC state change is expected in PR_SWAP
4988                  * Ignore it.
4989                  */
4990                 break;
4991         case FR_SWAP_SEND:
4992         case FR_SWAP_SEND_TIMEOUT:
4993         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4994         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4995         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4996                 /* Do nothing, CC change expected */
4997                 break;
4998
4999         case PORT_RESET:
5000         case PORT_RESET_WAIT_OFF:
5001                 /*
5002                  * State set back to default mode once the timer completes.
5003                  * Ignore CC changes here.
5004                  */
5005                 break;
5006         default:
5007                 /*
5008                  * While acting as sink and auto vbus discharge is enabled, Allow disconnect
5009                  * to be driven by vbus disconnect.
5010                  */
5011                 if (tcpm_port_is_disconnected(port) && !(port->pwr_role == TYPEC_SINK &&
5012                                                          port->auto_vbus_discharge_enabled))
5013                         tcpm_set_state(port, unattached_state(port), 0);
5014                 break;
5015         }
5016 }
5017
5018 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
5019 {
5020         tcpm_log_force(port, "VBUS on");
5021         port->vbus_present = true;
5022         /*
5023          * When vbus_present is true i.e. Voltage at VBUS is greater than VSAFE5V implicitly
5024          * states that vbus is not at VSAFE0V, hence clear the vbus_vsafe0v flag here.
5025          */
5026         port->vbus_vsafe0v = false;
5027
5028         switch (port->state) {
5029         case SNK_TRANSITION_SINK_VBUS:
5030                 port->explicit_contract = true;
5031                 /* Set the VDM flag ASAP */
5032                 if (port->data_role == TYPEC_HOST && port->send_discover)
5033                         port->vdm_sm_running = true;
5034                 tcpm_set_state(port, SNK_READY, 0);
5035                 break;
5036         case SNK_DISCOVERY:
5037                 tcpm_set_state(port, SNK_DISCOVERY, 0);
5038                 break;
5039
5040         case SNK_DEBOUNCED:
5041                 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
5042                                                         : SNK_ATTACHED,
5043                                        0);
5044                 break;
5045         case SNK_HARD_RESET_WAIT_VBUS:
5046                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
5047                 break;
5048         case SRC_ATTACHED:
5049                 tcpm_set_state(port, SRC_STARTUP, 0);
5050                 break;
5051         case SRC_HARD_RESET_VBUS_ON:
5052                 tcpm_set_state(port, SRC_STARTUP, 0);
5053                 break;
5054
5055         case SNK_TRY:
5056                 /* Do nothing, waiting for timeout */
5057                 break;
5058         case SRC_TRYWAIT:
5059                 /* Do nothing, Waiting for Rd to be detected */
5060                 break;
5061         case SRC_TRYWAIT_DEBOUNCE:
5062                 tcpm_set_state(port, SRC_TRYWAIT, 0);
5063                 break;
5064         case SNK_TRY_WAIT_DEBOUNCE:
5065                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5066                 break;
5067         case SNK_TRYWAIT:
5068                 /* Do nothing, waiting for tCCDebounce */
5069                 break;
5070         case SNK_TRYWAIT_VBUS:
5071                 if (tcpm_port_is_sink(port))
5072                         tcpm_set_state(port, SNK_ATTACHED, 0);
5073                 break;
5074         case SNK_TRYWAIT_DEBOUNCE:
5075                 /* Do nothing, waiting for Rp */
5076                 break;
5077         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5078                 if (port->vbus_present && tcpm_port_is_sink(port))
5079                         tcpm_set_state(port, SNK_ATTACHED, 0);
5080                 break;
5081         case SRC_TRY_WAIT:
5082         case SRC_TRY_DEBOUNCE:
5083                 /* Do nothing, waiting for sink detection */
5084                 break;
5085         case FR_SWAP_SEND:
5086         case FR_SWAP_SEND_TIMEOUT:
5087         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5088         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5089                 if (port->tcpc->frs_sourcing_vbus)
5090                         port->tcpc->frs_sourcing_vbus(port->tcpc);
5091                 break;
5092         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5093                 if (port->tcpc->frs_sourcing_vbus)
5094                         port->tcpc->frs_sourcing_vbus(port->tcpc);
5095                 tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
5096                 break;
5097
5098         case PORT_RESET:
5099         case PORT_RESET_WAIT_OFF:
5100                 /*
5101                  * State set back to default mode once the timer completes.
5102                  * Ignore vbus changes here.
5103                  */
5104                 break;
5105
5106         default:
5107                 break;
5108         }
5109 }
5110
5111 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
5112 {
5113         tcpm_log_force(port, "VBUS off");
5114         port->vbus_present = false;
5115         port->vbus_never_low = false;
5116         switch (port->state) {
5117         case SNK_HARD_RESET_SINK_OFF:
5118                 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
5119                 break;
5120         case HARD_RESET_SEND:
5121                 break;
5122         case SNK_TRY:
5123                 /* Do nothing, waiting for timeout */
5124                 break;
5125         case SRC_TRYWAIT:
5126                 /* Hand over to state machine if needed */
5127                 if (tcpm_port_is_source(port))
5128                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5129                 break;
5130         case SNK_TRY_WAIT_DEBOUNCE:
5131                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5132                 break;
5133         case SNK_TRYWAIT:
5134         case SNK_TRYWAIT_VBUS:
5135         case SNK_TRYWAIT_DEBOUNCE:
5136                 break;
5137         case SNK_ATTACH_WAIT:
5138                 tcpm_set_state(port, SNK_UNATTACHED, 0);
5139                 break;
5140
5141         case SNK_NEGOTIATE_CAPABILITIES:
5142                 break;
5143
5144         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5145                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
5146                 break;
5147
5148         case PR_SWAP_SNK_SRC_SINK_OFF:
5149                 /* Do nothing, expected */
5150                 break;
5151
5152         case PR_SWAP_SNK_SRC_SOURCE_ON:
5153                 /*
5154                  * Do nothing when vbus off notification is received.
5155                  * TCPM can wait for PD_T_NEWSRC in PR_SWAP_SNK_SRC_SOURCE_ON
5156                  * for the vbus source to ramp up.
5157                  */
5158                 break;
5159
5160         case PORT_RESET_WAIT_OFF:
5161                 tcpm_set_state(port, tcpm_default_state(port), 0);
5162                 break;
5163
5164         case SRC_TRY_WAIT:
5165         case SRC_TRY_DEBOUNCE:
5166                 /* Do nothing, waiting for sink detection */
5167                 break;
5168
5169         case SRC_STARTUP:
5170         case SRC_SEND_CAPABILITIES:
5171         case SRC_SEND_CAPABILITIES_TIMEOUT:
5172         case SRC_NEGOTIATE_CAPABILITIES:
5173         case SRC_TRANSITION_SUPPLY:
5174         case SRC_READY:
5175         case SRC_WAIT_NEW_CAPABILITIES:
5176                 /*
5177                  * Force to unattached state to re-initiate connection.
5178                  * DRP port should move to Unattached.SNK instead of Unattached.SRC if
5179                  * sink removed. Although sink removal here is due to source's vbus collapse,
5180                  * treat it the same way for consistency.
5181                  */
5182                 if (port->port_type == TYPEC_PORT_SRC)
5183                         tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
5184                 else
5185                         tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5186                 break;
5187
5188         case PORT_RESET:
5189                 /*
5190                  * State set back to default mode once the timer completes.
5191                  * Ignore vbus changes here.
5192                  */
5193                 break;
5194
5195         case FR_SWAP_SEND:
5196         case FR_SWAP_SEND_TIMEOUT:
5197         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5198         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5199         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5200                 /* Do nothing, vbus drop expected */
5201                 break;
5202
5203         default:
5204                 if (port->pwr_role == TYPEC_SINK && port->attached)
5205                         tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5206                 break;
5207         }
5208 }
5209
5210 static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
5211 {
5212         tcpm_log_force(port, "VBUS VSAFE0V");
5213         port->vbus_vsafe0v = true;
5214         switch (port->state) {
5215         case SRC_HARD_RESET_VBUS_OFF:
5216                 /*
5217                  * After establishing the vSafe0V voltage condition on VBUS, the Source Shall wait
5218                  * tSrcRecover before re-applying VCONN and restoring VBUS to vSafe5V.
5219                  */
5220                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
5221                 break;
5222         case SRC_ATTACH_WAIT:
5223                 if (tcpm_port_is_source(port))
5224                         tcpm_set_state(port, tcpm_try_snk(port) ? SNK_TRY : SRC_ATTACHED,
5225                                        PD_T_CC_DEBOUNCE);
5226                 break;
5227         case SRC_STARTUP:
5228         case SRC_SEND_CAPABILITIES:
5229         case SRC_SEND_CAPABILITIES_TIMEOUT:
5230         case SRC_NEGOTIATE_CAPABILITIES:
5231         case SRC_TRANSITION_SUPPLY:
5232         case SRC_READY:
5233         case SRC_WAIT_NEW_CAPABILITIES:
5234                 if (port->auto_vbus_discharge_enabled) {
5235                         if (port->port_type == TYPEC_PORT_SRC)
5236                                 tcpm_set_state(port, SRC_UNATTACHED, 0);
5237                         else
5238                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
5239                 }
5240                 break;
5241         case PR_SWAP_SNK_SRC_SINK_OFF:
5242         case PR_SWAP_SNK_SRC_SOURCE_ON:
5243                 /* Do nothing, vsafe0v is expected during transition */
5244                 break;
5245         default:
5246                 if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
5247                         tcpm_set_state(port, SNK_UNATTACHED, 0);
5248                 break;
5249         }
5250 }
5251
5252 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
5253 {
5254         tcpm_log_force(port, "Received hard reset");
5255         if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
5256                 port->tcpc->set_bist_data(port->tcpc, false);
5257
5258         if (port->ams != NONE_AMS)
5259                 port->ams = NONE_AMS;
5260         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
5261                 port->ams = HARD_RESET;
5262         /*
5263          * If we keep receiving hard reset requests, executing the hard reset
5264          * must have failed. Revert to error recovery if that happens.
5265          */
5266         tcpm_set_state(port,
5267                        port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
5268                                 HARD_RESET_START : ERROR_RECOVERY,
5269                        0);
5270 }
5271
5272 static void tcpm_pd_event_handler(struct kthread_work *work)
5273 {
5274         struct tcpm_port *port = container_of(work, struct tcpm_port,
5275                                               event_work);
5276         u32 events;
5277
5278         mutex_lock(&port->lock);
5279
5280         spin_lock(&port->pd_event_lock);
5281         while (port->pd_events) {
5282                 events = port->pd_events;
5283                 port->pd_events = 0;
5284                 spin_unlock(&port->pd_event_lock);
5285                 if (events & TCPM_RESET_EVENT)
5286                         _tcpm_pd_hard_reset(port);
5287                 if (events & TCPM_VBUS_EVENT) {
5288                         bool vbus;
5289
5290                         vbus = port->tcpc->get_vbus(port->tcpc);
5291                         if (vbus) {
5292                                 _tcpm_pd_vbus_on(port);
5293                         } else {
5294                                 _tcpm_pd_vbus_off(port);
5295                                 /*
5296                                  * When TCPC does not support detecting vsafe0v voltage level,
5297                                  * treat vbus absent as vsafe0v. Else invoke is_vbus_vsafe0v
5298                                  * to see if vbus has discharge to VSAFE0V.
5299                                  */
5300                                 if (!port->tcpc->is_vbus_vsafe0v ||
5301                                     port->tcpc->is_vbus_vsafe0v(port->tcpc))
5302                                         _tcpm_pd_vbus_vsafe0v(port);
5303                         }
5304                 }
5305                 if (events & TCPM_CC_EVENT) {
5306                         enum typec_cc_status cc1, cc2;
5307
5308                         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5309                                 _tcpm_cc_change(port, cc1, cc2);
5310                 }
5311                 if (events & TCPM_FRS_EVENT) {
5312                         if (port->state == SNK_READY) {
5313                                 int ret;
5314
5315                                 port->upcoming_state = FR_SWAP_SEND;
5316                                 ret = tcpm_ams_start(port, FAST_ROLE_SWAP);
5317                                 if (ret == -EAGAIN)
5318                                         port->upcoming_state = INVALID_STATE;
5319                         } else {
5320                                 tcpm_log(port, "Discarding FRS_SIGNAL! Not in sink ready");
5321                         }
5322                 }
5323                 if (events & TCPM_SOURCING_VBUS) {
5324                         tcpm_log(port, "sourcing vbus");
5325                         /*
5326                          * In fast role swap case TCPC autonomously sources vbus. Set vbus_source
5327                          * true as TCPM wouldn't have called tcpm_set_vbus.
5328                          *
5329                          * When vbus is sourced on the command on TCPM i.e. TCPM called
5330                          * tcpm_set_vbus to source vbus, vbus_source would already be true.
5331                          */
5332                         port->vbus_source = true;
5333                         _tcpm_pd_vbus_on(port);
5334                 }
5335
5336                 spin_lock(&port->pd_event_lock);
5337         }
5338         spin_unlock(&port->pd_event_lock);
5339         mutex_unlock(&port->lock);
5340 }
5341
5342 void tcpm_cc_change(struct tcpm_port *port)
5343 {
5344         spin_lock(&port->pd_event_lock);
5345         port->pd_events |= TCPM_CC_EVENT;
5346         spin_unlock(&port->pd_event_lock);
5347         kthread_queue_work(port->wq, &port->event_work);
5348 }
5349 EXPORT_SYMBOL_GPL(tcpm_cc_change);
5350
5351 void tcpm_vbus_change(struct tcpm_port *port)
5352 {
5353         spin_lock(&port->pd_event_lock);
5354         port->pd_events |= TCPM_VBUS_EVENT;
5355         spin_unlock(&port->pd_event_lock);
5356         kthread_queue_work(port->wq, &port->event_work);
5357 }
5358 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
5359
5360 void tcpm_pd_hard_reset(struct tcpm_port *port)
5361 {
5362         spin_lock(&port->pd_event_lock);
5363         port->pd_events = TCPM_RESET_EVENT;
5364         spin_unlock(&port->pd_event_lock);
5365         kthread_queue_work(port->wq, &port->event_work);
5366 }
5367 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
5368
5369 void tcpm_sink_frs(struct tcpm_port *port)
5370 {
5371         spin_lock(&port->pd_event_lock);
5372         port->pd_events |= TCPM_FRS_EVENT;
5373         spin_unlock(&port->pd_event_lock);
5374         kthread_queue_work(port->wq, &port->event_work);
5375 }
5376 EXPORT_SYMBOL_GPL(tcpm_sink_frs);
5377
5378 void tcpm_sourcing_vbus(struct tcpm_port *port)
5379 {
5380         spin_lock(&port->pd_event_lock);
5381         port->pd_events |= TCPM_SOURCING_VBUS;
5382         spin_unlock(&port->pd_event_lock);
5383         kthread_queue_work(port->wq, &port->event_work);
5384 }
5385 EXPORT_SYMBOL_GPL(tcpm_sourcing_vbus);
5386
5387 static void tcpm_enable_frs_work(struct kthread_work *work)
5388 {
5389         struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
5390         int ret;
5391
5392         mutex_lock(&port->lock);
5393         /* Not FRS capable */
5394         if (!port->connected || port->port_type != TYPEC_PORT_DRP ||
5395             port->pwr_opmode != TYPEC_PWR_MODE_PD ||
5396             !port->tcpc->enable_frs ||
5397             /* Sink caps queried */
5398             port->sink_cap_done || port->negotiated_rev < PD_REV30)
5399                 goto unlock;
5400
5401         /* Send when the state machine is idle */
5402         if (port->state != SNK_READY || port->vdm_sm_running || port->send_discover)
5403                 goto resched;
5404
5405         port->upcoming_state = GET_SINK_CAP;
5406         ret = tcpm_ams_start(port, GET_SINK_CAPABILITIES);
5407         if (ret == -EAGAIN) {
5408                 port->upcoming_state = INVALID_STATE;
5409         } else {
5410                 port->sink_cap_done = true;
5411                 goto unlock;
5412         }
5413 resched:
5414         mod_enable_frs_delayed_work(port, GET_SINK_CAP_RETRY_MS);
5415 unlock:
5416         mutex_unlock(&port->lock);
5417 }
5418
5419 static void tcpm_send_discover_work(struct kthread_work *work)
5420 {
5421         struct tcpm_port *port = container_of(work, struct tcpm_port, send_discover_work);
5422
5423         mutex_lock(&port->lock);
5424         /* No need to send DISCOVER_IDENTITY anymore */
5425         if (!port->send_discover)
5426                 goto unlock;
5427
5428         /* Retry if the port is not idle */
5429         if ((port->state != SRC_READY && port->state != SNK_READY) || port->vdm_sm_running) {
5430                 mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS);
5431                 goto unlock;
5432         }
5433
5434         /* Only send the Message if the port is host for PD rev2.0 */
5435         if (port->data_role == TYPEC_HOST || port->negotiated_rev > PD_REV20)
5436                 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
5437
5438 unlock:
5439         mutex_unlock(&port->lock);
5440 }
5441
5442 static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
5443 {
5444         struct tcpm_port *port = typec_get_drvdata(p);
5445         int ret;
5446
5447         mutex_lock(&port->swap_lock);
5448         mutex_lock(&port->lock);
5449
5450         if (port->typec_caps.data != TYPEC_PORT_DRD) {
5451                 ret = -EINVAL;
5452                 goto port_unlock;
5453         }
5454         if (port->state != SRC_READY && port->state != SNK_READY) {
5455                 ret = -EAGAIN;
5456                 goto port_unlock;
5457         }
5458
5459         if (port->data_role == data) {
5460                 ret = 0;
5461                 goto port_unlock;
5462         }
5463
5464         /*
5465          * XXX
5466          * 6.3.9: If an alternate mode is active, a request to swap
5467          * alternate modes shall trigger a port reset.
5468          * Reject data role swap request in this case.
5469          */
5470
5471         if (!port->pd_capable) {
5472                 /*
5473                  * If the partner is not PD capable, reset the port to
5474                  * trigger a role change. This can only work if a preferred
5475                  * role is configured, and if it matches the requested role.
5476                  */
5477                 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
5478                     port->try_role == port->pwr_role) {
5479                         ret = -EINVAL;
5480                         goto port_unlock;
5481                 }
5482                 port->non_pd_role_swap = true;
5483                 tcpm_set_state(port, PORT_RESET, 0);
5484         } else {
5485                 port->upcoming_state = DR_SWAP_SEND;
5486                 ret = tcpm_ams_start(port, DATA_ROLE_SWAP);
5487                 if (ret == -EAGAIN) {
5488                         port->upcoming_state = INVALID_STATE;
5489                         goto port_unlock;
5490                 }
5491         }
5492
5493         port->swap_status = 0;
5494         port->swap_pending = true;
5495         reinit_completion(&port->swap_complete);
5496         mutex_unlock(&port->lock);
5497
5498         if (!wait_for_completion_timeout(&port->swap_complete,
5499                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5500                 ret = -ETIMEDOUT;
5501         else
5502                 ret = port->swap_status;
5503
5504         port->non_pd_role_swap = false;
5505         goto swap_unlock;
5506
5507 port_unlock:
5508         mutex_unlock(&port->lock);
5509 swap_unlock:
5510         mutex_unlock(&port->swap_lock);
5511         return ret;
5512 }
5513
5514 static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
5515 {
5516         struct tcpm_port *port = typec_get_drvdata(p);
5517         int ret;
5518
5519         mutex_lock(&port->swap_lock);
5520         mutex_lock(&port->lock);
5521
5522         if (port->port_type != TYPEC_PORT_DRP) {
5523                 ret = -EINVAL;
5524                 goto port_unlock;
5525         }
5526         if (port->state != SRC_READY && port->state != SNK_READY) {
5527                 ret = -EAGAIN;
5528                 goto port_unlock;
5529         }
5530
5531         if (role == port->pwr_role) {
5532                 ret = 0;
5533                 goto port_unlock;
5534         }
5535
5536         port->upcoming_state = PR_SWAP_SEND;
5537         ret = tcpm_ams_start(port, POWER_ROLE_SWAP);
5538         if (ret == -EAGAIN) {
5539                 port->upcoming_state = INVALID_STATE;
5540                 goto port_unlock;
5541         }
5542
5543         port->swap_status = 0;
5544         port->swap_pending = true;
5545         reinit_completion(&port->swap_complete);
5546         mutex_unlock(&port->lock);
5547
5548         if (!wait_for_completion_timeout(&port->swap_complete,
5549                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5550                 ret = -ETIMEDOUT;
5551         else
5552                 ret = port->swap_status;
5553
5554         goto swap_unlock;
5555
5556 port_unlock:
5557         mutex_unlock(&port->lock);
5558 swap_unlock:
5559         mutex_unlock(&port->swap_lock);
5560         return ret;
5561 }
5562
5563 static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
5564 {
5565         struct tcpm_port *port = typec_get_drvdata(p);
5566         int ret;
5567
5568         mutex_lock(&port->swap_lock);
5569         mutex_lock(&port->lock);
5570
5571         if (port->state != SRC_READY && port->state != SNK_READY) {
5572                 ret = -EAGAIN;
5573                 goto port_unlock;
5574         }
5575
5576         if (role == port->vconn_role) {
5577                 ret = 0;
5578                 goto port_unlock;
5579         }
5580
5581         port->upcoming_state = VCONN_SWAP_SEND;
5582         ret = tcpm_ams_start(port, VCONN_SWAP);
5583         if (ret == -EAGAIN) {
5584                 port->upcoming_state = INVALID_STATE;
5585                 goto port_unlock;
5586         }
5587
5588         port->swap_status = 0;
5589         port->swap_pending = true;
5590         reinit_completion(&port->swap_complete);
5591         mutex_unlock(&port->lock);
5592
5593         if (!wait_for_completion_timeout(&port->swap_complete,
5594                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5595                 ret = -ETIMEDOUT;
5596         else
5597                 ret = port->swap_status;
5598
5599         goto swap_unlock;
5600
5601 port_unlock:
5602         mutex_unlock(&port->lock);
5603 swap_unlock:
5604         mutex_unlock(&port->swap_lock);
5605         return ret;
5606 }
5607
5608 static int tcpm_try_role(struct typec_port *p, int role)
5609 {
5610         struct tcpm_port *port = typec_get_drvdata(p);
5611         struct tcpc_dev *tcpc = port->tcpc;
5612         int ret = 0;
5613
5614         mutex_lock(&port->lock);
5615         if (tcpc->try_role)
5616                 ret = tcpc->try_role(tcpc, role);
5617         if (!ret)
5618                 port->try_role = role;
5619         port->try_src_count = 0;
5620         port->try_snk_count = 0;
5621         mutex_unlock(&port->lock);
5622
5623         return ret;
5624 }
5625
5626 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 req_op_curr)
5627 {
5628         unsigned int target_mw;
5629         int ret;
5630
5631         mutex_lock(&port->swap_lock);
5632         mutex_lock(&port->lock);
5633
5634         if (!port->pps_data.active) {
5635                 ret = -EOPNOTSUPP;
5636                 goto port_unlock;
5637         }
5638
5639         if (port->state != SNK_READY) {
5640                 ret = -EAGAIN;
5641                 goto port_unlock;
5642         }
5643
5644         if (req_op_curr > port->pps_data.max_curr) {
5645                 ret = -EINVAL;
5646                 goto port_unlock;
5647         }
5648
5649         target_mw = (req_op_curr * port->supply_voltage) / 1000;
5650         if (target_mw < port->operating_snk_mw) {
5651                 ret = -EINVAL;
5652                 goto port_unlock;
5653         }
5654
5655         port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5656         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5657         if (ret == -EAGAIN) {
5658                 port->upcoming_state = INVALID_STATE;
5659                 goto port_unlock;
5660         }
5661
5662         /* Round down operating current to align with PPS valid steps */
5663         req_op_curr = req_op_curr - (req_op_curr % RDO_PROG_CURR_MA_STEP);
5664
5665         reinit_completion(&port->pps_complete);
5666         port->pps_data.req_op_curr = req_op_curr;
5667         port->pps_status = 0;
5668         port->pps_pending = true;
5669         mutex_unlock(&port->lock);
5670
5671         if (!wait_for_completion_timeout(&port->pps_complete,
5672                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5673                 ret = -ETIMEDOUT;
5674         else
5675                 ret = port->pps_status;
5676
5677         goto swap_unlock;
5678
5679 port_unlock:
5680         mutex_unlock(&port->lock);
5681 swap_unlock:
5682         mutex_unlock(&port->swap_lock);
5683
5684         return ret;
5685 }
5686
5687 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 req_out_volt)
5688 {
5689         unsigned int target_mw;
5690         int ret;
5691
5692         mutex_lock(&port->swap_lock);
5693         mutex_lock(&port->lock);
5694
5695         if (!port->pps_data.active) {
5696                 ret = -EOPNOTSUPP;
5697                 goto port_unlock;
5698         }
5699
5700         if (port->state != SNK_READY) {
5701                 ret = -EAGAIN;
5702                 goto port_unlock;
5703         }
5704
5705         if (req_out_volt < port->pps_data.min_volt ||
5706             req_out_volt > port->pps_data.max_volt) {
5707                 ret = -EINVAL;
5708                 goto port_unlock;
5709         }
5710
5711         target_mw = (port->current_limit * req_out_volt) / 1000;
5712         if (target_mw < port->operating_snk_mw) {
5713                 ret = -EINVAL;
5714                 goto port_unlock;
5715         }
5716
5717         port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5718         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5719         if (ret == -EAGAIN) {
5720                 port->upcoming_state = INVALID_STATE;
5721                 goto port_unlock;
5722         }
5723
5724         /* Round down output voltage to align with PPS valid steps */
5725         req_out_volt = req_out_volt - (req_out_volt % RDO_PROG_VOLT_MV_STEP);
5726
5727         reinit_completion(&port->pps_complete);
5728         port->pps_data.req_out_volt = req_out_volt;
5729         port->pps_status = 0;
5730         port->pps_pending = true;
5731         mutex_unlock(&port->lock);
5732
5733         if (!wait_for_completion_timeout(&port->pps_complete,
5734                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5735                 ret = -ETIMEDOUT;
5736         else
5737                 ret = port->pps_status;
5738
5739         goto swap_unlock;
5740
5741 port_unlock:
5742         mutex_unlock(&port->lock);
5743 swap_unlock:
5744         mutex_unlock(&port->swap_lock);
5745
5746         return ret;
5747 }
5748
5749 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
5750 {
5751         int ret = 0;
5752
5753         mutex_lock(&port->swap_lock);
5754         mutex_lock(&port->lock);
5755
5756         if (!port->pps_data.supported) {
5757                 ret = -EOPNOTSUPP;
5758                 goto port_unlock;
5759         }
5760
5761         /* Trying to deactivate PPS when already deactivated so just bail */
5762         if (!port->pps_data.active && !activate)
5763                 goto port_unlock;
5764
5765         if (port->state != SNK_READY) {
5766                 ret = -EAGAIN;
5767                 goto port_unlock;
5768         }
5769
5770         if (activate)
5771                 port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5772         else
5773                 port->upcoming_state = SNK_NEGOTIATE_CAPABILITIES;
5774         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5775         if (ret == -EAGAIN) {
5776                 port->upcoming_state = INVALID_STATE;
5777                 goto port_unlock;
5778         }
5779
5780         reinit_completion(&port->pps_complete);
5781         port->pps_status = 0;
5782         port->pps_pending = true;
5783
5784         /* Trigger PPS request or move back to standard PDO contract */
5785         if (activate) {
5786                 port->pps_data.req_out_volt = port->supply_voltage;
5787                 port->pps_data.req_op_curr = port->current_limit;
5788         }
5789         mutex_unlock(&port->lock);
5790
5791         if (!wait_for_completion_timeout(&port->pps_complete,
5792                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5793                 ret = -ETIMEDOUT;
5794         else
5795                 ret = port->pps_status;
5796
5797         goto swap_unlock;
5798
5799 port_unlock:
5800         mutex_unlock(&port->lock);
5801 swap_unlock:
5802         mutex_unlock(&port->swap_lock);
5803
5804         return ret;
5805 }
5806
5807 static void tcpm_init(struct tcpm_port *port)
5808 {
5809         enum typec_cc_status cc1, cc2;
5810
5811         port->tcpc->init(port->tcpc);
5812
5813         tcpm_reset_port(port);
5814
5815         /*
5816          * XXX
5817          * Should possibly wait for VBUS to settle if it was enabled locally
5818          * since tcpm_reset_port() will disable VBUS.
5819          */
5820         port->vbus_present = port->tcpc->get_vbus(port->tcpc);
5821         if (port->vbus_present)
5822                 port->vbus_never_low = true;
5823
5824         /*
5825          * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V.
5826          * So implicitly vbus_vsafe0v = false.
5827          *
5828          * 2. When vbus_present is false and TCPC does NOT support querying
5829          * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e.
5830          * vbus_vsafe0v is true.
5831          *
5832          * 3. When vbus_present is false and TCPC does support querying vsafe0v,
5833          * then, query tcpc for vsafe0v status.
5834          */
5835         if (port->vbus_present)
5836                 port->vbus_vsafe0v = false;
5837         else if (!port->tcpc->is_vbus_vsafe0v)
5838                 port->vbus_vsafe0v = true;
5839         else
5840                 port->vbus_vsafe0v = port->tcpc->is_vbus_vsafe0v(port->tcpc);
5841
5842         tcpm_set_state(port, tcpm_default_state(port), 0);
5843
5844         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5845                 _tcpm_cc_change(port, cc1, cc2);
5846
5847         /*
5848          * Some adapters need a clean slate at startup, and won't recover
5849          * otherwise. So do not try to be fancy and force a clean disconnect.
5850          */
5851         tcpm_set_state(port, PORT_RESET, 0);
5852 }
5853
5854 static int tcpm_port_type_set(struct typec_port *p, enum typec_port_type type)
5855 {
5856         struct tcpm_port *port = typec_get_drvdata(p);
5857
5858         mutex_lock(&port->lock);
5859         if (type == port->port_type)
5860                 goto port_unlock;
5861
5862         port->port_type = type;
5863
5864         if (!port->connected) {
5865                 tcpm_set_state(port, PORT_RESET, 0);
5866         } else if (type == TYPEC_PORT_SNK) {
5867                 if (!(port->pwr_role == TYPEC_SINK &&
5868                       port->data_role == TYPEC_DEVICE))
5869                         tcpm_set_state(port, PORT_RESET, 0);
5870         } else if (type == TYPEC_PORT_SRC) {
5871                 if (!(port->pwr_role == TYPEC_SOURCE &&
5872                       port->data_role == TYPEC_HOST))
5873                         tcpm_set_state(port, PORT_RESET, 0);
5874         }
5875
5876 port_unlock:
5877         mutex_unlock(&port->lock);
5878         return 0;
5879 }
5880
5881 static const struct typec_operations tcpm_ops = {
5882         .try_role = tcpm_try_role,
5883         .dr_set = tcpm_dr_set,
5884         .pr_set = tcpm_pr_set,
5885         .vconn_set = tcpm_vconn_set,
5886         .port_type_set = tcpm_port_type_set
5887 };
5888
5889 void tcpm_tcpc_reset(struct tcpm_port *port)
5890 {
5891         mutex_lock(&port->lock);
5892         /* XXX: Maintain PD connection if possible? */
5893         tcpm_init(port);
5894         mutex_unlock(&port->lock);
5895 }
5896 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
5897
5898 static int tcpm_fw_get_caps(struct tcpm_port *port,
5899                             struct fwnode_handle *fwnode)
5900 {
5901         const char *cap_str;
5902         int ret;
5903         u32 mw, frs_current;
5904
5905         if (!fwnode)
5906                 return -EINVAL;
5907
5908         /*
5909          * This fwnode has a "compatible" property, but is never populated as a
5910          * struct device. Instead we simply parse it to read the properties.
5911          * This it breaks fw_devlink=on. To maintain backward compatibility
5912          * with existing DT files, we work around this by deleting any
5913          * fwnode_links to/from this fwnode.
5914          */
5915         fw_devlink_purge_absent_suppliers(fwnode);
5916
5917         /* USB data support is optional */
5918         ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
5919         if (ret == 0) {
5920                 ret = typec_find_port_data_role(cap_str);
5921                 if (ret < 0)
5922                         return ret;
5923                 port->typec_caps.data = ret;
5924         }
5925
5926         ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
5927         if (ret < 0)
5928                 return ret;
5929
5930         ret = typec_find_port_power_role(cap_str);
5931         if (ret < 0)
5932                 return ret;
5933         port->typec_caps.type = ret;
5934         port->port_type = port->typec_caps.type;
5935
5936         port->slow_charger_loop = fwnode_property_read_bool(fwnode, "slow-charger-loop");
5937         if (port->port_type == TYPEC_PORT_SNK)
5938                 goto sink;
5939
5940         /* Get source pdos */
5941         ret = fwnode_property_count_u32(fwnode, "source-pdos");
5942         if (ret <= 0)
5943                 return -EINVAL;
5944
5945         port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
5946         ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
5947                                              port->src_pdo, port->nr_src_pdo);
5948         if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
5949                                             port->nr_src_pdo))
5950                 return -EINVAL;
5951
5952         if (port->port_type == TYPEC_PORT_SRC)
5953                 return 0;
5954
5955         /* Get the preferred power role for DRP */
5956         ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
5957         if (ret < 0)
5958                 return ret;
5959
5960         port->typec_caps.prefer_role = typec_find_power_role(cap_str);
5961         if (port->typec_caps.prefer_role < 0)
5962                 return -EINVAL;
5963 sink:
5964         /* Get sink pdos */
5965         ret = fwnode_property_count_u32(fwnode, "sink-pdos");
5966         if (ret <= 0)
5967                 return -EINVAL;
5968
5969         port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
5970         ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
5971                                              port->snk_pdo, port->nr_snk_pdo);
5972         if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
5973                                             port->nr_snk_pdo))
5974                 return -EINVAL;
5975
5976         if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
5977                 return -EINVAL;
5978         port->operating_snk_mw = mw / 1000;
5979
5980         port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
5981
5982         /* FRS can only be supported byb DRP ports */
5983         if (port->port_type == TYPEC_PORT_DRP) {
5984                 ret = fwnode_property_read_u32(fwnode, "new-source-frs-typec-current",
5985                                                &frs_current);
5986                 if (ret >= 0 && frs_current <= FRS_5V_3A)
5987                         port->new_source_frs_current = frs_current;
5988         }
5989
5990         /* sink-vdos is optional */
5991         ret = fwnode_property_count_u32(fwnode, "sink-vdos");
5992         if (ret < 0)
5993                 ret = 0;
5994
5995         port->nr_snk_vdo = min(ret, VDO_MAX_OBJECTS);
5996         if (port->nr_snk_vdo) {
5997                 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos",
5998                                                      port->snk_vdo,
5999                                                      port->nr_snk_vdo);
6000                 if (ret < 0)
6001                         return ret;
6002         }
6003
6004         /* If sink-vdos is found, sink-vdos-v1 is expected for backward compatibility. */
6005         if (port->nr_snk_vdo) {
6006                 ret = fwnode_property_count_u32(fwnode, "sink-vdos-v1");
6007                 if (ret < 0)
6008                         return ret;
6009                 else if (ret == 0)
6010                         return -ENODATA;
6011
6012                 port->nr_snk_vdo_v1 = min(ret, VDO_MAX_OBJECTS);
6013                 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos-v1",
6014                                                      port->snk_vdo_v1,
6015                                                      port->nr_snk_vdo_v1);
6016                 if (ret < 0)
6017                         return ret;
6018         }
6019
6020         return 0;
6021 }
6022
6023 /* Power Supply access to expose source power information */
6024 enum tcpm_psy_online_states {
6025         TCPM_PSY_OFFLINE = 0,
6026         TCPM_PSY_FIXED_ONLINE,
6027         TCPM_PSY_PROG_ONLINE,
6028 };
6029
6030 static enum power_supply_property tcpm_psy_props[] = {
6031         POWER_SUPPLY_PROP_USB_TYPE,
6032         POWER_SUPPLY_PROP_ONLINE,
6033         POWER_SUPPLY_PROP_VOLTAGE_MIN,
6034         POWER_SUPPLY_PROP_VOLTAGE_MAX,
6035         POWER_SUPPLY_PROP_VOLTAGE_NOW,
6036         POWER_SUPPLY_PROP_CURRENT_MAX,
6037         POWER_SUPPLY_PROP_CURRENT_NOW,
6038 };
6039
6040 static int tcpm_psy_get_online(struct tcpm_port *port,
6041                                union power_supply_propval *val)
6042 {
6043         if (port->vbus_charge) {
6044                 if (port->pps_data.active)
6045                         val->intval = TCPM_PSY_PROG_ONLINE;
6046                 else
6047                         val->intval = TCPM_PSY_FIXED_ONLINE;
6048         } else {
6049                 val->intval = TCPM_PSY_OFFLINE;
6050         }
6051
6052         return 0;
6053 }
6054
6055 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
6056                                     union power_supply_propval *val)
6057 {
6058         if (port->pps_data.active)
6059                 val->intval = port->pps_data.min_volt * 1000;
6060         else
6061                 val->intval = port->supply_voltage * 1000;
6062
6063         return 0;
6064 }
6065
6066 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
6067                                     union power_supply_propval *val)
6068 {
6069         if (port->pps_data.active)
6070                 val->intval = port->pps_data.max_volt * 1000;
6071         else
6072                 val->intval = port->supply_voltage * 1000;
6073
6074         return 0;
6075 }
6076
6077 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
6078                                     union power_supply_propval *val)
6079 {
6080         val->intval = port->supply_voltage * 1000;
6081
6082         return 0;
6083 }
6084
6085 static int tcpm_psy_get_current_max(struct tcpm_port *port,
6086                                     union power_supply_propval *val)
6087 {
6088         if (port->pps_data.active)
6089                 val->intval = port->pps_data.max_curr * 1000;
6090         else
6091                 val->intval = port->current_limit * 1000;
6092
6093         return 0;
6094 }
6095
6096 static int tcpm_psy_get_current_now(struct tcpm_port *port,
6097                                     union power_supply_propval *val)
6098 {
6099         val->intval = port->current_limit * 1000;
6100
6101         return 0;
6102 }
6103
6104 static int tcpm_psy_get_prop(struct power_supply *psy,
6105                              enum power_supply_property psp,
6106                              union power_supply_propval *val)
6107 {
6108         struct tcpm_port *port = power_supply_get_drvdata(psy);
6109         int ret = 0;
6110
6111         switch (psp) {
6112         case POWER_SUPPLY_PROP_USB_TYPE:
6113                 val->intval = port->usb_type;
6114                 break;
6115         case POWER_SUPPLY_PROP_ONLINE:
6116                 ret = tcpm_psy_get_online(port, val);
6117                 break;
6118         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
6119                 ret = tcpm_psy_get_voltage_min(port, val);
6120                 break;
6121         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
6122                 ret = tcpm_psy_get_voltage_max(port, val);
6123                 break;
6124         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6125                 ret = tcpm_psy_get_voltage_now(port, val);
6126                 break;
6127         case POWER_SUPPLY_PROP_CURRENT_MAX:
6128                 ret = tcpm_psy_get_current_max(port, val);
6129                 break;
6130         case POWER_SUPPLY_PROP_CURRENT_NOW:
6131                 ret = tcpm_psy_get_current_now(port, val);
6132                 break;
6133         default:
6134                 ret = -EINVAL;
6135                 break;
6136         }
6137
6138         return ret;
6139 }
6140
6141 static int tcpm_psy_set_online(struct tcpm_port *port,
6142                                const union power_supply_propval *val)
6143 {
6144         int ret;
6145
6146         switch (val->intval) {
6147         case TCPM_PSY_FIXED_ONLINE:
6148                 ret = tcpm_pps_activate(port, false);
6149                 break;
6150         case TCPM_PSY_PROG_ONLINE:
6151                 ret = tcpm_pps_activate(port, true);
6152                 break;
6153         default:
6154                 ret = -EINVAL;
6155                 break;
6156         }
6157
6158         return ret;
6159 }
6160
6161 static int tcpm_psy_set_prop(struct power_supply *psy,
6162                              enum power_supply_property psp,
6163                              const union power_supply_propval *val)
6164 {
6165         struct tcpm_port *port = power_supply_get_drvdata(psy);
6166         int ret;
6167
6168         switch (psp) {
6169         case POWER_SUPPLY_PROP_ONLINE:
6170                 ret = tcpm_psy_set_online(port, val);
6171                 break;
6172         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6173                 if (val->intval < port->pps_data.min_volt * 1000 ||
6174                     val->intval > port->pps_data.max_volt * 1000)
6175                         ret = -EINVAL;
6176                 else
6177                         ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
6178                 break;
6179         case POWER_SUPPLY_PROP_CURRENT_NOW:
6180                 if (val->intval > port->pps_data.max_curr * 1000)
6181                         ret = -EINVAL;
6182                 else
6183                         ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
6184                 break;
6185         default:
6186                 ret = -EINVAL;
6187                 break;
6188         }
6189         power_supply_changed(port->psy);
6190         return ret;
6191 }
6192
6193 static int tcpm_psy_prop_writeable(struct power_supply *psy,
6194                                    enum power_supply_property psp)
6195 {
6196         switch (psp) {
6197         case POWER_SUPPLY_PROP_ONLINE:
6198         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6199         case POWER_SUPPLY_PROP_CURRENT_NOW:
6200                 return 1;
6201         default:
6202                 return 0;
6203         }
6204 }
6205
6206 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
6207         POWER_SUPPLY_USB_TYPE_C,
6208         POWER_SUPPLY_USB_TYPE_PD,
6209         POWER_SUPPLY_USB_TYPE_PD_PPS,
6210 };
6211
6212 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
6213
6214 static int devm_tcpm_psy_register(struct tcpm_port *port)
6215 {
6216         struct power_supply_config psy_cfg = {};
6217         const char *port_dev_name = dev_name(port->dev);
6218         size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
6219                                      strlen(port_dev_name) + 1;
6220         char *psy_name;
6221
6222         psy_cfg.drv_data = port;
6223         psy_cfg.fwnode = dev_fwnode(port->dev);
6224         psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
6225         if (!psy_name)
6226                 return -ENOMEM;
6227
6228         snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
6229                  port_dev_name);
6230         port->psy_desc.name = psy_name;
6231         port->psy_desc.type = POWER_SUPPLY_TYPE_USB;
6232         port->psy_desc.usb_types = tcpm_psy_usb_types;
6233         port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
6234         port->psy_desc.properties = tcpm_psy_props;
6235         port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props);
6236         port->psy_desc.get_property = tcpm_psy_get_prop;
6237         port->psy_desc.set_property = tcpm_psy_set_prop;
6238         port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable;
6239
6240         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
6241
6242         port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
6243                                                &psy_cfg);
6244
6245         return PTR_ERR_OR_ZERO(port->psy);
6246 }
6247
6248 static enum hrtimer_restart state_machine_timer_handler(struct hrtimer *timer)
6249 {
6250         struct tcpm_port *port = container_of(timer, struct tcpm_port, state_machine_timer);
6251
6252         kthread_queue_work(port->wq, &port->state_machine);
6253         return HRTIMER_NORESTART;
6254 }
6255
6256 static enum hrtimer_restart vdm_state_machine_timer_handler(struct hrtimer *timer)
6257 {
6258         struct tcpm_port *port = container_of(timer, struct tcpm_port, vdm_state_machine_timer);
6259
6260         kthread_queue_work(port->wq, &port->vdm_state_machine);
6261         return HRTIMER_NORESTART;
6262 }
6263
6264 static enum hrtimer_restart enable_frs_timer_handler(struct hrtimer *timer)
6265 {
6266         struct tcpm_port *port = container_of(timer, struct tcpm_port, enable_frs_timer);
6267
6268         kthread_queue_work(port->wq, &port->enable_frs);
6269         return HRTIMER_NORESTART;
6270 }
6271
6272 static enum hrtimer_restart send_discover_timer_handler(struct hrtimer *timer)
6273 {
6274         struct tcpm_port *port = container_of(timer, struct tcpm_port, send_discover_timer);
6275
6276         kthread_queue_work(port->wq, &port->send_discover_work);
6277         return HRTIMER_NORESTART;
6278 }
6279
6280 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
6281 {
6282         struct tcpm_port *port;
6283         int err;
6284
6285         if (!dev || !tcpc ||
6286             !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
6287             !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
6288             !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
6289                 return ERR_PTR(-EINVAL);
6290
6291         port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
6292         if (!port)
6293                 return ERR_PTR(-ENOMEM);
6294
6295         port->dev = dev;
6296         port->tcpc = tcpc;
6297
6298         mutex_init(&port->lock);
6299         mutex_init(&port->swap_lock);
6300
6301         port->wq = kthread_create_worker(0, dev_name(dev));
6302         if (IS_ERR(port->wq))
6303                 return ERR_CAST(port->wq);
6304         sched_set_fifo(port->wq->task);
6305
6306         kthread_init_work(&port->state_machine, tcpm_state_machine_work);
6307         kthread_init_work(&port->vdm_state_machine, vdm_state_machine_work);
6308         kthread_init_work(&port->event_work, tcpm_pd_event_handler);
6309         kthread_init_work(&port->enable_frs, tcpm_enable_frs_work);
6310         kthread_init_work(&port->send_discover_work, tcpm_send_discover_work);
6311         hrtimer_init(&port->state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6312         port->state_machine_timer.function = state_machine_timer_handler;
6313         hrtimer_init(&port->vdm_state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6314         port->vdm_state_machine_timer.function = vdm_state_machine_timer_handler;
6315         hrtimer_init(&port->enable_frs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6316         port->enable_frs_timer.function = enable_frs_timer_handler;
6317         hrtimer_init(&port->send_discover_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6318         port->send_discover_timer.function = send_discover_timer_handler;
6319
6320         spin_lock_init(&port->pd_event_lock);
6321
6322         init_completion(&port->tx_complete);
6323         init_completion(&port->swap_complete);
6324         init_completion(&port->pps_complete);
6325         tcpm_debugfs_init(port);
6326
6327         err = tcpm_fw_get_caps(port, tcpc->fwnode);
6328         if (err < 0)
6329                 goto out_destroy_wq;
6330
6331         port->try_role = port->typec_caps.prefer_role;
6332
6333         port->typec_caps.fwnode = tcpc->fwnode;
6334         port->typec_caps.revision = 0x0120;     /* Type-C spec release 1.2 */
6335         port->typec_caps.pd_revision = 0x0300;  /* USB-PD spec release 3.0 */
6336         port->typec_caps.svdm_version = SVDM_VER_2_0;
6337         port->typec_caps.driver_data = port;
6338         port->typec_caps.ops = &tcpm_ops;
6339         port->typec_caps.orientation_aware = 1;
6340
6341         port->partner_desc.identity = &port->partner_ident;
6342         port->port_type = port->typec_caps.type;
6343
6344         port->role_sw = usb_role_switch_get(port->dev);
6345         if (IS_ERR(port->role_sw)) {
6346                 err = PTR_ERR(port->role_sw);
6347                 goto out_destroy_wq;
6348         }
6349
6350         err = devm_tcpm_psy_register(port);
6351         if (err)
6352                 goto out_role_sw_put;
6353         power_supply_changed(port->psy);
6354
6355         port->typec_port = typec_register_port(port->dev, &port->typec_caps);
6356         if (IS_ERR(port->typec_port)) {
6357                 err = PTR_ERR(port->typec_port);
6358                 goto out_role_sw_put;
6359         }
6360
6361         typec_port_register_altmodes(port->typec_port,
6362                                      &tcpm_altmode_ops, port,
6363                                      port->port_altmode, ALTMODE_DISCOVERY_MAX);
6364
6365         mutex_lock(&port->lock);
6366         tcpm_init(port);
6367         mutex_unlock(&port->lock);
6368
6369         tcpm_log(port, "%s: registered", dev_name(dev));
6370         return port;
6371
6372 out_role_sw_put:
6373         usb_role_switch_put(port->role_sw);
6374 out_destroy_wq:
6375         tcpm_debugfs_exit(port);
6376         kthread_destroy_worker(port->wq);
6377         return ERR_PTR(err);
6378 }
6379 EXPORT_SYMBOL_GPL(tcpm_register_port);
6380
6381 void tcpm_unregister_port(struct tcpm_port *port)
6382 {
6383         int i;
6384
6385         hrtimer_cancel(&port->send_discover_timer);
6386         hrtimer_cancel(&port->enable_frs_timer);
6387         hrtimer_cancel(&port->vdm_state_machine_timer);
6388         hrtimer_cancel(&port->state_machine_timer);
6389
6390         tcpm_reset_port(port);
6391         for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
6392                 typec_unregister_altmode(port->port_altmode[i]);
6393         typec_unregister_port(port->typec_port);
6394         usb_role_switch_put(port->role_sw);
6395         tcpm_debugfs_exit(port);
6396         kthread_destroy_worker(port->wq);
6397 }
6398 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
6399
6400 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
6401 MODULE_DESCRIPTION("USB Type-C Port Manager");
6402 MODULE_LICENSE("GPL");