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/jiffies.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/mutex.h>
  15 #include <linux/power_supply.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/property.h>
  18 #include <linux/sched/clock.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/slab.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/usb/pd.h>
  23 #include <linux/usb/pd_ado.h>
  24 #include <linux/usb/pd_bdo.h>
  25 #include <linux/usb/pd_ext_sdb.h>
  26 #include <linux/usb/pd_vdo.h>
  27 #include <linux/usb/role.h>
  28 #include <linux/usb/tcpm.h>
  29 #include <linux/usb/typec_altmode.h>
  30 #include <linux/workqueue.h>
  31
  32 #define FOREACH_STATE(S)                        \
  33         S(INVALID_STATE),                       \
  34         S(TOGGLING),                    \
  35         S(SRC_UNATTACHED),                      \
  36         S(SRC_ATTACH_WAIT),                     \
  37         S(SRC_ATTACHED),                        \
  38         S(SRC_STARTUP),                         \
  39         S(SRC_SEND_CAPABILITIES),               \
  40         S(SRC_SEND_CAPABILITIES_TIMEOUT),       \
  41         S(SRC_NEGOTIATE_CAPABILITIES),          \
  42         S(SRC_TRANSITION_SUPPLY),               \
  43         S(SRC_READY),                           \
  44         S(SRC_WAIT_NEW_CAPABILITIES),           \
  45                                                 \
  46         S(SNK_UNATTACHED),                      \
  47         S(SNK_ATTACH_WAIT),                     \
  48         S(SNK_DEBOUNCED),                       \
  49         S(SNK_ATTACHED),                        \
  50         S(SNK_STARTUP),                         \
  51         S(SNK_DISCOVERY),                       \
  52         S(SNK_DISCOVERY_DEBOUNCE),              \
  53         S(SNK_DISCOVERY_DEBOUNCE_DONE),         \
  54         S(SNK_WAIT_CAPABILITIES),               \
  55         S(SNK_NEGOTIATE_CAPABILITIES),          \
  56         S(SNK_NEGOTIATE_PPS_CAPABILITIES),      \
  57         S(SNK_TRANSITION_SINK),                 \
  58         S(SNK_TRANSITION_SINK_VBUS),            \
  59         S(SNK_READY),                           \
  60                                                 \
  61         S(ACC_UNATTACHED),                      \
  62         S(DEBUG_ACC_ATTACHED),                  \
  63         S(AUDIO_ACC_ATTACHED),                  \
  64         S(AUDIO_ACC_DEBOUNCE),                  \
  65                                                 \
  66         S(HARD_RESET_SEND),                     \
  67         S(HARD_RESET_START),                    \
  68         S(SRC_HARD_RESET_VBUS_OFF),             \
  69         S(SRC_HARD_RESET_VBUS_ON),              \
  70         S(SNK_HARD_RESET_SINK_OFF),             \
  71         S(SNK_HARD_RESET_WAIT_VBUS),            \
  72         S(SNK_HARD_RESET_SINK_ON),              \
  73                                                 \
  74         S(SOFT_RESET),                          \
  75         S(SOFT_RESET_SEND),                     \
  76                                                 \
  77         S(DR_SWAP_ACCEPT),                      \
  78         S(DR_SWAP_SEND),                        \
  79         S(DR_SWAP_SEND_TIMEOUT),                \
  80         S(DR_SWAP_CANCEL),                      \
  81         S(DR_SWAP_CHANGE_DR),                   \
  82                                                 \
  83         S(PR_SWAP_ACCEPT),                      \
  84         S(PR_SWAP_SEND),                        \
  85         S(PR_SWAP_SEND_TIMEOUT),                \
  86         S(PR_SWAP_CANCEL),                      \
  87         S(PR_SWAP_START),                       \
  88         S(PR_SWAP_SRC_SNK_TRANSITION_OFF),      \
  89         S(PR_SWAP_SRC_SNK_SOURCE_OFF),          \
  90         S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
  91         S(PR_SWAP_SRC_SNK_SINK_ON),             \
  92         S(PR_SWAP_SNK_SRC_SINK_OFF),            \
  93         S(PR_SWAP_SNK_SRC_SOURCE_ON),           \
  94         S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP),    \
  95                                                 \
  96         S(VCONN_SWAP_ACCEPT),                   \
  97         S(VCONN_SWAP_SEND),                     \
  98         S(VCONN_SWAP_SEND_TIMEOUT),             \
  99         S(VCONN_SWAP_CANCEL),                   \
 100         S(VCONN_SWAP_START),                    \
 101         S(VCONN_SWAP_WAIT_FOR_VCONN),           \
 102         S(VCONN_SWAP_TURN_ON_VCONN),            \
 103         S(VCONN_SWAP_TURN_OFF_VCONN),           \
 104                                                 \
 105         S(SNK_TRY),                             \
 106         S(SNK_TRY_WAIT),                        \
 107         S(SNK_TRY_WAIT_DEBOUNCE),               \
 108         S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS),    \
 109         S(SRC_TRYWAIT),                         \
 110         S(SRC_TRYWAIT_DEBOUNCE),                \
 111         S(SRC_TRYWAIT_UNATTACHED),              \
 112                                                 \
 113         S(SRC_TRY),                             \
 114         S(SRC_TRY_WAIT),                        \
 115         S(SRC_TRY_DEBOUNCE),                    \
 116         S(SNK_TRYWAIT),                         \
 117         S(SNK_TRYWAIT_DEBOUNCE),                \
 118         S(SNK_TRYWAIT_VBUS),                    \
 119         S(BIST_RX),                             \
 120                                                 \
 121         S(GET_STATUS_SEND),                     \
 122         S(GET_STATUS_SEND_TIMEOUT),             \
 123         S(GET_PPS_STATUS_SEND),                 \
 124         S(GET_PPS_STATUS_SEND_TIMEOUT),         \
 125                                                 \
 126         S(ERROR_RECOVERY),                      \
 127         S(PORT_RESET),                          \
 128         S(PORT_RESET_WAIT_OFF)
 129
 130 #define GENERATE_ENUM(e)        e
 131 #define GENERATE_STRING(s)      #s
 132
 133 enum tcpm_state {
 134         FOREACH_STATE(GENERATE_ENUM)
 135 };
 136
 137 static const char * const tcpm_states[] = {
 138         FOREACH_STATE(GENERATE_STRING)
 139 };
 140
 141 enum vdm_states {
 142         VDM_STATE_ERR_BUSY = -3,
 143         VDM_STATE_ERR_SEND = -2,
 144         VDM_STATE_ERR_TMOUT = -1,
 145         VDM_STATE_DONE = 0,
 146         /* Anything >0 represents an active state */
 147         VDM_STATE_READY = 1,
 148         VDM_STATE_BUSY = 2,
 149         VDM_STATE_WAIT_RSP_BUSY = 3,
 150 };
 151
 152 enum pd_msg_request {
 153         PD_MSG_NONE = 0,
 154         PD_MSG_CTRL_REJECT,
 155         PD_MSG_CTRL_WAIT,
 156         PD_MSG_CTRL_NOT_SUPP,
 157         PD_MSG_DATA_SINK_CAP,
 158         PD_MSG_DATA_SOURCE_CAP,
 159 };
 160
 161 /* Events from low level driver */
 162
 163 #define TCPM_CC_EVENT           BIT(0)
 164 #define TCPM_VBUS_EVENT         BIT(1)
 165 #define TCPM_RESET_EVENT        BIT(2)
 166
 167 #define LOG_BUFFER_ENTRIES      1024
 168 #define LOG_BUFFER_ENTRY_SIZE   128
 169
 170 /* Alternate mode support */
 171
 172 #define SVID_DISCOVERY_MAX      16
 173 #define ALTMODE_DISCOVERY_MAX   (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
 174
 175 struct pd_mode_data {
 176         int svid_index;         /* current SVID index           */
 177         int nsvids;
 178         u16 svids[SVID_DISCOVERY_MAX];
 179         int altmodes;           /* number of alternate modes    */
 180         struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
 181 };
 182
 183 struct pd_pps_data {
 184         u32 min_volt;
 185         u32 max_volt;
 186         u32 max_curr;
 187         u32 out_volt;
 188         u32 op_curr;
 189         bool supported;
 190         bool active;
 191 };
 192
 193 struct tcpm_port {
 194         struct device *dev;
 195
 196         struct mutex lock;              /* tcpm state machine lock */
 197         struct workqueue_struct *wq;
 198
 199         struct typec_capability typec_caps;
 200         struct typec_port *typec_port;
 201
 202         struct tcpc_dev *tcpc;
 203         struct usb_role_switch *role_sw;
 204
 205         enum typec_role vconn_role;
 206         enum typec_role pwr_role;
 207         enum typec_data_role data_role;
 208         enum typec_pwr_opmode pwr_opmode;
 209
 210         struct usb_pd_identity partner_ident;
 211         struct typec_partner_desc partner_desc;
 212         struct typec_partner *partner;
 213
 214         enum typec_cc_status cc_req;
 215
 216         enum typec_cc_status cc1;
 217         enum typec_cc_status cc2;
 218         enum typec_cc_polarity polarity;
 219
 220         bool attached;
 221         bool connected;
 222         enum typec_port_type port_type;
 223         bool vbus_present;
 224         bool vbus_never_low;
 225         bool vbus_source;
 226         bool vbus_charge;
 227
 228         bool send_discover;
 229         bool op_vsafe5v;
 230
 231         int try_role;
 232         int try_snk_count;
 233         int try_src_count;
 234
 235         enum pd_msg_request queued_message;
 236
 237         enum tcpm_state enter_state;
 238         enum tcpm_state prev_state;
 239         enum tcpm_state state;
 240         enum tcpm_state delayed_state;
 241         unsigned long delayed_runtime;
 242         unsigned long delay_ms;
 243
 244         spinlock_t pd_event_lock;
 245         u32 pd_events;
 246
 247         struct work_struct event_work;
 248         struct delayed_work state_machine;
 249         struct delayed_work vdm_state_machine;
 250         bool state_machine_running;
 251
 252         struct completion tx_complete;
 253         enum tcpm_transmit_status tx_status;
 254
 255         struct mutex swap_lock;         /* swap command lock */
 256         bool swap_pending;
 257         bool non_pd_role_swap;
 258         struct completion swap_complete;
 259         int swap_status;
 260
 261         unsigned int negotiated_rev;
 262         unsigned int message_id;
 263         unsigned int caps_count;
 264         unsigned int hard_reset_count;
 265         bool pd_capable;
 266         bool explicit_contract;
 267         unsigned int rx_msgid;
 268
 269         /* Partner capabilities/requests */
 270         u32 sink_request;
 271         u32 source_caps[PDO_MAX_OBJECTS];
 272         unsigned int nr_source_caps;
 273         u32 sink_caps[PDO_MAX_OBJECTS];
 274         unsigned int nr_sink_caps;
 275
 276         /* Local capabilities */
 277         u32 src_pdo[PDO_MAX_OBJECTS];
 278         unsigned int nr_src_pdo;
 279         u32 snk_pdo[PDO_MAX_OBJECTS];
 280         unsigned int nr_snk_pdo;
 281         u32 snk_vdo[VDO_MAX_OBJECTS];
 282         unsigned int nr_snk_vdo;
 283
 284         unsigned int operating_snk_mw;
 285         bool update_sink_caps;
 286
 287         /* Requested current / voltage */
 288         u32 current_limit;
 289         u32 supply_voltage;
 290
 291         /* Used to export TA voltage and current */
 292         struct power_supply *psy;
 293         struct power_supply_desc psy_desc;
 294         enum power_supply_usb_type usb_type;
 295
 296         u32 bist_request;
 297
 298         /* PD state for Vendor Defined Messages */
 299         enum vdm_states vdm_state;
 300         u32 vdm_retries;
 301         /* next Vendor Defined Message to send */
 302         u32 vdo_data[VDO_MAX_SIZE];
 303         u8 vdo_count;
 304         /* VDO to retry if UFP responder replied busy */
 305         u32 vdo_retry;
 306
 307         /* PPS */
 308         struct pd_pps_data pps_data;
 309         struct completion pps_complete;
 310         bool pps_pending;
 311         int pps_status;
 312
 313         /* Alternate mode data */
 314         struct pd_mode_data mode_data;
 315         struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
 316         struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
 317
 318         /* Deadline in jiffies to exit src_try_wait state */
 319         unsigned long max_wait;
 320
 321         /* port belongs to a self powered device */
 322         bool self_powered;
 323
 324 #ifdef CONFIG_DEBUG_FS
 325         struct dentry *dentry;
 326         struct mutex logbuffer_lock;    /* log buffer access lock */
 327         int logbuffer_head;
 328         int logbuffer_tail;
 329         u8 *logbuffer[LOG_BUFFER_ENTRIES];
 330 #endif
 331 };
 332
 333 struct pd_rx_event {
 334         struct work_struct work;
 335         struct tcpm_port *port;
 336         struct pd_message msg;
 337 };
 338
 339 #define tcpm_cc_is_sink(cc) \
 340         ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
 341          (cc) == TYPEC_CC_RP_3_0)
 342
 343 #define tcpm_port_is_sink(port) \
 344         ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
 345          (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
 346
 347 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
 348 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
 349 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
 350
 351 #define tcpm_port_is_source(port) \
 352         ((tcpm_cc_is_source((port)->cc1) && \
 353          !tcpm_cc_is_source((port)->cc2)) || \
 354          (tcpm_cc_is_source((port)->cc2) && \
 355           !tcpm_cc_is_source((port)->cc1)))
 356
 357 #define tcpm_port_is_debug(port) \
 358         (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
 359
 360 #define tcpm_port_is_audio(port) \
 361         (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
 362
 363 #define tcpm_port_is_audio_detached(port) \
 364         ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
 365          (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
 366
 367 #define tcpm_try_snk(port) \
 368         ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
 369         (port)->port_type == TYPEC_PORT_DRP)
 370
 371 #define tcpm_try_src(port) \
 372         ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
 373         (port)->port_type == TYPEC_PORT_DRP)
 374
 375 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
 376 {
 377         if (port->port_type == TYPEC_PORT_DRP) {
 378                 if (port->try_role == TYPEC_SINK)
 379                         return SNK_UNATTACHED;
 380                 else if (port->try_role == TYPEC_SOURCE)
 381                         return SRC_UNATTACHED;
 382                 else if (port->tcpc->config &&
 383                          port->tcpc->config->default_role == TYPEC_SINK)
 384                         return SNK_UNATTACHED;
 385                 /* Fall through to return SRC_UNATTACHED */
 386         } else if (port->port_type == TYPEC_PORT_SNK) {
 387                 return SNK_UNATTACHED;
 388         }
 389         return SRC_UNATTACHED;
 390 }
 391
 392 static inline
 393 struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
 394 {
 395         return container_of(cap, struct tcpm_port, typec_caps);
 396 }
 397
 398 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
 399 {
 400         return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
 401                 port->cc2 == TYPEC_CC_OPEN) ||
 402                (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
 403                                     port->cc1 == TYPEC_CC_OPEN) ||
 404                                    (port->polarity == TYPEC_POLARITY_CC2 &&
 405                                     port->cc2 == TYPEC_CC_OPEN)));
 406 }
 407
 408 /*
 409  * Logging
 410  */
 411
 412 #ifdef CONFIG_DEBUG_FS
 413
 414 static bool tcpm_log_full(struct tcpm_port *port)
 415 {
 416         return port->logbuffer_tail ==
 417                 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 418 }
 419
 420 __printf(2, 0)
 421 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
 422 {
 423         char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
 424         u64 ts_nsec = local_clock();
 425         unsigned long rem_nsec;
 426
 427         mutex_lock(&port->logbuffer_lock);
 428         if (!port->logbuffer[port->logbuffer_head]) {
 429                 port->logbuffer[port->logbuffer_head] =
 430                                 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
 431                 if (!port->logbuffer[port->logbuffer_head]) {
 432                         mutex_unlock(&port->logbuffer_lock);
 433                         return;
 434                 }
 435         }
 436
 437         vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
 438
 439         if (tcpm_log_full(port)) {
 440                 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
 441                 strcpy(tmpbuffer, "overflow");
 442         }
 443
 444         if (port->logbuffer_head < 0 ||
 445             port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
 446                 dev_warn(port->dev,
 447                          "Bad log buffer index %d\n", port->logbuffer_head);
 448                 goto abort;
 449         }
 450
 451         if (!port->logbuffer[port->logbuffer_head]) {
 452                 dev_warn(port->dev,
 453                          "Log buffer index %d is NULL\n", port->logbuffer_head);
 454                 goto abort;
 455         }
 456
 457         rem_nsec = do_div(ts_nsec, 1000000000);
 458         scnprintf(port->logbuffer[port->logbuffer_head],
 459                   LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
 460                   (unsigned long)ts_nsec, rem_nsec / 1000,
 461                   tmpbuffer);
 462         port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 463
 464 abort:
 465         mutex_unlock(&port->logbuffer_lock);
 466 }
 467
 468 __printf(2, 3)
 469 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
 470 {
 471         va_list args;
 472
 473         /* Do not log while disconnected and unattached */
 474         if (tcpm_port_is_disconnected(port) &&
 475             (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
 476              port->state == TOGGLING))
 477                 return;
 478
 479         va_start(args, fmt);
 480         _tcpm_log(port, fmt, args);
 481         va_end(args);
 482 }
 483
 484 __printf(2, 3)
 485 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
 486 {
 487         va_list args;
 488
 489         va_start(args, fmt);
 490         _tcpm_log(port, fmt, args);
 491         va_end(args);
 492 }
 493
 494 static void tcpm_log_source_caps(struct tcpm_port *port)
 495 {
 496         int i;
 497
 498         for (i = 0; i < port->nr_source_caps; i++) {
 499                 u32 pdo = port->source_caps[i];
 500                 enum pd_pdo_type type = pdo_type(pdo);
 501                 char msg[64];
 502
 503                 switch (type) {
 504                 case PDO_TYPE_FIXED:
 505                         scnprintf(msg, sizeof(msg),
 506                                   "%u mV, %u mA [%s%s%s%s%s%s]",
 507                                   pdo_fixed_voltage(pdo),
 508                                   pdo_max_current(pdo),
 509                                   (pdo & PDO_FIXED_DUAL_ROLE) ?
 510                                                         "R" : "",
 511                                   (pdo & PDO_FIXED_SUSPEND) ?
 512                                                         "S" : "",
 513                                   (pdo & PDO_FIXED_HIGHER_CAP) ?
 514                                                         "H" : "",
 515                                   (pdo & PDO_FIXED_USB_COMM) ?
 516                                                         "U" : "",
 517                                   (pdo & PDO_FIXED_DATA_SWAP) ?
 518                                                         "D" : "",
 519                                   (pdo & PDO_FIXED_EXTPOWER) ?
 520                                                         "E" : "");
 521                         break;
 522                 case PDO_TYPE_VAR:
 523                         scnprintf(msg, sizeof(msg),
 524                                   "%u-%u mV, %u mA",
 525                                   pdo_min_voltage(pdo),
 526                                   pdo_max_voltage(pdo),
 527                                   pdo_max_current(pdo));
 528                         break;
 529                 case PDO_TYPE_BATT:
 530                         scnprintf(msg, sizeof(msg),
 531                                   "%u-%u mV, %u mW",
 532                                   pdo_min_voltage(pdo),
 533                                   pdo_max_voltage(pdo),
 534                                   pdo_max_power(pdo));
 535                         break;
 536                 case PDO_TYPE_APDO:
 537                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
 538                                 scnprintf(msg, sizeof(msg),
 539                                           "%u-%u mV, %u mA",
 540                                           pdo_pps_apdo_min_voltage(pdo),
 541                                           pdo_pps_apdo_max_voltage(pdo),
 542                                           pdo_pps_apdo_max_current(pdo));
 543                         else
 544                                 strcpy(msg, "undefined APDO");
 545                         break;
 546                 default:
 547                         strcpy(msg, "undefined");
 548                         break;
 549                 }
 550                 tcpm_log(port, " PDO %d: type %d, %s",
 551                          i, type, msg);
 552         }
 553 }
 554
 555 static int tcpm_debug_show(struct seq_file *s, void *v)
 556 {
 557         struct tcpm_port *port = (struct tcpm_port *)s->private;
 558         int tail;
 559
 560         mutex_lock(&port->logbuffer_lock);
 561         tail = port->logbuffer_tail;
 562         while (tail != port->logbuffer_head) {
 563                 seq_printf(s, "%s\n", port->logbuffer[tail]);
 564                 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
 565         }
 566         if (!seq_has_overflowed(s))
 567                 port->logbuffer_tail = tail;
 568         mutex_unlock(&port->logbuffer_lock);
 569
 570         return 0;
 571 }
 572 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
 573
 574 static struct dentry *rootdir;
 575
 576 static void tcpm_debugfs_init(struct tcpm_port *port)
 577 {
 578         mutex_init(&port->logbuffer_lock);
 579         /* /sys/kernel/debug/tcpm/usbcX */
 580         if (!rootdir)
 581                 rootdir = debugfs_create_dir("tcpm", NULL);
 582
 583         port->dentry = debugfs_create_file(dev_name(port->dev),
 584                                            S_IFREG | 0444, rootdir,
 585                                            port, &tcpm_debug_fops);
 586 }
 587
 588 static void tcpm_debugfs_exit(struct tcpm_port *port)
 589 {
 590         int i;
 591
 592         mutex_lock(&port->logbuffer_lock);
 593         for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
 594                 kfree(port->logbuffer[i]);
 595                 port->logbuffer[i] = NULL;
 596         }
 597         mutex_unlock(&port->logbuffer_lock);
 598
 599         debugfs_remove(port->dentry);
 600         if (list_empty(&rootdir->d_subdirs)) {
 601                 debugfs_remove(rootdir);
 602                 rootdir = NULL;
 603         }
 604 }
 605
 606 #else
 607
 608 __printf(2, 3)
 609 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
 610 __printf(2, 3)
 611 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
 612 static void tcpm_log_source_caps(struct tcpm_port *port) { }
 613 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
 614 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
 615
 616 #endif
 617
 618 static int tcpm_pd_transmit(struct tcpm_port *port,
 619                             enum tcpm_transmit_type type,
 620                             const struct pd_message *msg)
 621 {
 622         unsigned long timeout;
 623         int ret;
 624
 625         if (msg)
 626                 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
 627         else
 628                 tcpm_log(port, "PD TX, type: %#x", type);
 629
 630         reinit_completion(&port->tx_complete);
 631         ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
 632         if (ret < 0)
 633                 return ret;
 634
 635         mutex_unlock(&port->lock);
 636         timeout = wait_for_completion_timeout(&port->tx_complete,
 637                                 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
 638         mutex_lock(&port->lock);
 639         if (!timeout)
 640                 return -ETIMEDOUT;
 641
 642         switch (port->tx_status) {
 643         case TCPC_TX_SUCCESS:
 644                 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
 645                 return 0;
 646         case TCPC_TX_DISCARDED:
 647                 return -EAGAIN;
 648         case TCPC_TX_FAILED:
 649         default:
 650                 return -EIO;
 651         }
 652 }
 653
 654 void tcpm_pd_transmit_complete(struct tcpm_port *port,
 655                                enum tcpm_transmit_status status)
 656 {
 657         tcpm_log(port, "PD TX complete, status: %u", status);
 658         port->tx_status = status;
 659         complete(&port->tx_complete);
 660 }
 661 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
 662
 663 static int tcpm_mux_set(struct tcpm_port *port, int state,
 664                         enum usb_role usb_role,
 665                         enum typec_orientation orientation)
 666 {
 667         int ret;
 668
 669         tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
 670                  state, usb_role, orientation);
 671
 672         ret = typec_set_orientation(port->typec_port, orientation);
 673         if (ret)
 674                 return ret;
 675
 676         if (port->role_sw) {
 677                 ret = usb_role_switch_set_role(port->role_sw, usb_role);
 678                 if (ret)
 679                         return ret;
 680         }
 681
 682         return typec_set_mode(port->typec_port, state);
 683 }
 684
 685 static int tcpm_set_polarity(struct tcpm_port *port,
 686                              enum typec_cc_polarity polarity)
 687 {
 688         int ret;
 689
 690         tcpm_log(port, "polarity %d", polarity);
 691
 692         ret = port->tcpc->set_polarity(port->tcpc, polarity);
 693         if (ret < 0)
 694                 return ret;
 695
 696         port->polarity = polarity;
 697
 698         return 0;
 699 }
 700
 701 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
 702 {
 703         int ret;
 704
 705         tcpm_log(port, "vconn:=%d", enable);
 706
 707         ret = port->tcpc->set_vconn(port->tcpc, enable);
 708         if (!ret) {
 709                 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
 710                 typec_set_vconn_role(port->typec_port, port->vconn_role);
 711         }
 712
 713         return ret;
 714 }
 715
 716 static u32 tcpm_get_current_limit(struct tcpm_port *port)
 717 {
 718         enum typec_cc_status cc;
 719         u32 limit;
 720
 721         cc = port->polarity ? port->cc2 : port->cc1;
 722         switch (cc) {
 723         case TYPEC_CC_RP_1_5:
 724                 limit = 1500;
 725                 break;
 726         case TYPEC_CC_RP_3_0:
 727                 limit = 3000;
 728                 break;
 729         case TYPEC_CC_RP_DEF:
 730         default:
 731                 if (port->tcpc->get_current_limit)
 732                         limit = port->tcpc->get_current_limit(port->tcpc);
 733                 else
 734                         limit = 0;
 735                 break;
 736         }
 737
 738         return limit;
 739 }
 740
 741 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
 742 {
 743         int ret = -EOPNOTSUPP;
 744
 745         tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
 746
 747         port->supply_voltage = mv;
 748         port->current_limit = max_ma;
 749
 750         if (port->tcpc->set_current_limit)
 751                 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
 752
 753         return ret;
 754 }
 755
 756 /*
 757  * Determine RP value to set based on maximum current supported
 758  * by a port if configured as source.
 759  * Returns CC value to report to link partner.
 760  */
 761 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
 762 {
 763         const u32 *src_pdo = port->src_pdo;
 764         int nr_pdo = port->nr_src_pdo;
 765         int i;
 766
 767         /*
 768          * Search for first entry with matching voltage.
 769          * It should report the maximum supported current.
 770          */
 771         for (i = 0; i < nr_pdo; i++) {
 772                 const u32 pdo = src_pdo[i];
 773
 774                 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
 775                     pdo_fixed_voltage(pdo) == 5000) {
 776                         unsigned int curr = pdo_max_current(pdo);
 777
 778                         if (curr >= 3000)
 779                                 return TYPEC_CC_RP_3_0;
 780                         else if (curr >= 1500)
 781                                 return TYPEC_CC_RP_1_5;
 782                         return TYPEC_CC_RP_DEF;
 783                 }
 784         }
 785
 786         return TYPEC_CC_RP_DEF;
 787 }
 788
 789 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
 790 {
 791         return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
 792                                      port->data_role);
 793 }
 794
 795 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
 796                           enum typec_role role, enum typec_data_role data)
 797 {
 798         enum typec_orientation orientation;
 799         enum usb_role usb_role;
 800         int ret;
 801
 802         if (port->polarity == TYPEC_POLARITY_CC1)
 803                 orientation = TYPEC_ORIENTATION_NORMAL;
 804         else
 805                 orientation = TYPEC_ORIENTATION_REVERSE;
 806
 807         if (data == TYPEC_HOST)
 808                 usb_role = USB_ROLE_HOST;
 809         else
 810                 usb_role = USB_ROLE_DEVICE;
 811
 812         ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
 813         if (ret < 0)
 814                 return ret;
 815
 816         ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
 817         if (ret < 0)
 818                 return ret;
 819
 820         port->pwr_role = role;
 821         port->data_role = data;
 822         typec_set_data_role(port->typec_port, data);
 823         typec_set_pwr_role(port->typec_port, role);
 824
 825         return 0;
 826 }
 827
 828 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
 829 {
 830         int ret;
 831
 832         ret = port->tcpc->set_roles(port->tcpc, true, role,
 833                                     port->data_role);
 834         if (ret < 0)
 835                 return ret;
 836
 837         port->pwr_role = role;
 838         typec_set_pwr_role(port->typec_port, role);
 839
 840         return 0;
 841 }
 842
 843 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
 844 {
 845         struct pd_message msg;
 846         int i;
 847
 848         memset(&msg, 0, sizeof(msg));
 849         if (!port->nr_src_pdo) {
 850                 /* No source capabilities defined, sink only */
 851                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
 852                                           port->pwr_role,
 853                                           port->data_role,
 854                                           port->negotiated_rev,
 855                                           port->message_id, 0);
 856         } else {
 857                 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
 858                                           port->pwr_role,
 859                                           port->data_role,
 860                                           port->negotiated_rev,
 861                                           port->message_id,
 862                                           port->nr_src_pdo);
 863         }
 864         for (i = 0; i < port->nr_src_pdo; i++)
 865                 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
 866
 867         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
 868 }
 869
 870 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
 871 {
 872         struct pd_message msg;
 873         int i;
 874
 875         memset(&msg, 0, sizeof(msg));
 876         if (!port->nr_snk_pdo) {
 877                 /* No sink capabilities defined, source only */
 878                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
 879                                           port->pwr_role,
 880                                           port->data_role,
 881                                           port->negotiated_rev,
 882                                           port->message_id, 0);
 883         } else {
 884                 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
 885                                           port->pwr_role,
 886                                           port->data_role,
 887                                           port->negotiated_rev,
 888                                           port->message_id,
 889                                           port->nr_snk_pdo);
 890         }
 891         for (i = 0; i < port->nr_snk_pdo; i++)
 892                 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
 893
 894         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
 895 }
 896
 897 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
 898                            unsigned int delay_ms)
 899 {
 900         if (delay_ms) {
 901                 tcpm_log(port, "pending state change %s -> %s @ %u ms",
 902                          tcpm_states[port->state], tcpm_states[state],
 903                          delay_ms);
 904                 port->delayed_state = state;
 905                 mod_delayed_work(port->wq, &port->state_machine,
 906                                  msecs_to_jiffies(delay_ms));
 907                 port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
 908                 port->delay_ms = delay_ms;
 909         } else {
 910                 tcpm_log(port, "state change %s -> %s",
 911                          tcpm_states[port->state], tcpm_states[state]);
 912                 port->delayed_state = INVALID_STATE;
 913                 port->prev_state = port->state;
 914                 port->state = state;
 915                 /*
 916                  * Don't re-queue the state machine work item if we're currently
 917                  * in the state machine and we're immediately changing states.
 918                  * tcpm_state_machine_work() will continue running the state
 919                  * machine.
 920                  */
 921                 if (!port->state_machine_running)
 922                         mod_delayed_work(port->wq, &port->state_machine, 0);
 923         }
 924 }
 925
 926 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
 927                                 unsigned int delay_ms)
 928 {
 929         if (port->enter_state == port->state)
 930                 tcpm_set_state(port, state, delay_ms);
 931         else
 932                 tcpm_log(port,
 933                          "skipped %sstate change %s -> %s [%u ms], context state %s",
 934                          delay_ms ? "delayed " : "",
 935                          tcpm_states[port->state], tcpm_states[state],
 936                          delay_ms, tcpm_states[port->enter_state]);
 937 }
 938
 939 static void tcpm_queue_message(struct tcpm_port *port,
 940                                enum pd_msg_request message)
 941 {
 942         port->queued_message = message;
 943         mod_delayed_work(port->wq, &port->state_machine, 0);
 944 }
 945
 946 /*
 947  * VDM/VDO handling functions
 948  */
 949 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
 950                            const u32 *data, int cnt)
 951 {
 952         port->vdo_count = cnt + 1;
 953         port->vdo_data[0] = header;
 954         memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
 955         /* Set ready, vdm state machine will actually send */
 956         port->vdm_retries = 0;
 957         port->vdm_state = VDM_STATE_READY;
 958 }
 959
 960 static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
 961                                   int cnt)
 962 {
 963         u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
 964         u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
 965
 966         memset(&port->mode_data, 0, sizeof(port->mode_data));
 967
 968         port->partner_ident.id_header = vdo;
 969         port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
 970         port->partner_ident.product = product;
 971
 972         typec_partner_set_identity(port->partner);
 973
 974         tcpm_log(port, "Identity: %04x:%04x.%04x",
 975                  PD_IDH_VID(vdo),
 976                  PD_PRODUCT_PID(product), product & 0xffff);
 977 }
 978
 979 static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
 980                                int cnt)
 981 {
 982         struct pd_mode_data *pmdata = &port->mode_data;
 983         int i;
 984
 985         for (i = 1; i < cnt; i++) {
 986                 u32 p = le32_to_cpu(payload[i]);
 987                 u16 svid;
 988
 989                 svid = (p >> 16) & 0xffff;
 990                 if (!svid)
 991                         return false;
 992
 993                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
 994                         goto abort;
 995
 996                 pmdata->svids[pmdata->nsvids++] = svid;
 997                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
 998
 999                 svid = p & 0xffff;
1000                 if (!svid)
1001                         return false;
1002
1003                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1004                         goto abort;
1005
1006                 pmdata->svids[pmdata->nsvids++] = svid;
1007                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1008         }
1009         return true;
1010 abort:
1011         tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1012         return false;
1013 }
1014
1015 static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
1016                                int cnt)
1017 {
1018         struct pd_mode_data *pmdata = &port->mode_data;
1019         struct typec_altmode_desc *paltmode;
1020         int i;
1021
1022         if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1023                 /* Already logged in svdm_consume_svids() */
1024                 return;
1025         }
1026
1027         for (i = 1; i < cnt; i++) {
1028                 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1029                 memset(paltmode, 0, sizeof(*paltmode));
1030
1031                 paltmode->svid = pmdata->svids[pmdata->svid_index];
1032                 paltmode->mode = i;
1033                 paltmode->vdo = le32_to_cpu(payload[i]);
1034
1035                 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1036                          pmdata->altmodes, paltmode->svid,
1037                          paltmode->mode, paltmode->vdo);
1038
1039                 pmdata->altmodes++;
1040         }
1041 }
1042
1043 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1044 {
1045         struct pd_mode_data *modep = &port->mode_data;
1046         struct typec_altmode *altmode;
1047         int i;
1048
1049         for (i = 0; i < modep->altmodes; i++) {
1050                 altmode = typec_partner_register_altmode(port->partner,
1051                                                 &modep->altmode_desc[i]);
1052                 if (!altmode)
1053                         tcpm_log(port, "Failed to register partner SVID 0x%04x",
1054                                  modep->altmode_desc[i].svid);
1055                 port->partner_altmode[i] = altmode;
1056         }
1057 }
1058
1059 #define supports_modal(port)    PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1060
1061 static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
1062                         u32 *response)
1063 {
1064         struct typec_altmode *adev;
1065         struct typec_altmode *pdev;
1066         struct pd_mode_data *modep;
1067         u32 p[PD_MAX_PAYLOAD];
1068         int rlen = 0;
1069         int cmd_type;
1070         int cmd;
1071         int i;
1072
1073         for (i = 0; i < cnt; i++)
1074                 p[i] = le32_to_cpu(payload[i]);
1075
1076         cmd_type = PD_VDO_CMDT(p[0]);
1077         cmd = PD_VDO_CMD(p[0]);
1078
1079         tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1080                  p[0], cmd_type, cmd, cnt);
1081
1082         modep = &port->mode_data;
1083
1084         adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1085                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1086
1087         pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1088                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1089
1090         switch (cmd_type) {
1091         case CMDT_INIT:
1092                 switch (cmd) {
1093                 case CMD_DISCOVER_IDENT:
1094                         /* 6.4.4.3.1: Only respond as UFP (device) */
1095                         if (port->data_role == TYPEC_DEVICE &&
1096                             port->nr_snk_vdo) {
1097                                 for (i = 0; i <  port->nr_snk_vdo; i++)
1098                                         response[i + 1] = port->snk_vdo[i];
1099                                 rlen = port->nr_snk_vdo + 1;
1100                         }
1101                         break;
1102                 case CMD_DISCOVER_SVID:
1103                         break;
1104                 case CMD_DISCOVER_MODES:
1105                         break;
1106                 case CMD_ENTER_MODE:
1107                         break;
1108                 case CMD_EXIT_MODE:
1109                         break;
1110                 case CMD_ATTENTION:
1111                         /* Attention command does not have response */
1112                         if (adev)
1113                                 typec_altmode_attention(adev, p[1]);
1114                         return 0;
1115                 default:
1116                         break;
1117                 }
1118                 if (rlen >= 1) {
1119                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1120                 } else if (rlen == 0) {
1121                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1122                         rlen = 1;
1123                 } else {
1124                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1125                         rlen = 1;
1126                 }
1127                 break;
1128         case CMDT_RSP_ACK:
1129                 /* silently drop message if we are not connected */
1130                 if (IS_ERR_OR_NULL(port->partner))
1131                         break;
1132
1133                 switch (cmd) {
1134                 case CMD_DISCOVER_IDENT:
1135                         /* 6.4.4.3.1 */
1136                         svdm_consume_identity(port, payload, cnt);
1137                         response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
1138                         rlen = 1;
1139                         break;
1140                 case CMD_DISCOVER_SVID:
1141                         /* 6.4.4.3.2 */
1142                         if (svdm_consume_svids(port, payload, cnt)) {
1143                                 response[0] = VDO(USB_SID_PD, 1,
1144                                                   CMD_DISCOVER_SVID);
1145                                 rlen = 1;
1146                         } else if (modep->nsvids && supports_modal(port)) {
1147                                 response[0] = VDO(modep->svids[0], 1,
1148                                                   CMD_DISCOVER_MODES);
1149                                 rlen = 1;
1150                         }
1151                         break;
1152                 case CMD_DISCOVER_MODES:
1153                         /* 6.4.4.3.3 */
1154                         svdm_consume_modes(port, payload, cnt);
1155                         modep->svid_index++;
1156                         if (modep->svid_index < modep->nsvids) {
1157                                 u16 svid = modep->svids[modep->svid_index];
1158                                 response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
1159                                 rlen = 1;
1160                         } else {
1161                                 tcpm_register_partner_altmodes(port);
1162                         }
1163                         break;
1164                 case CMD_ENTER_MODE:
1165                         if (adev && pdev) {
1166                                 typec_altmode_update_active(pdev, true);
1167
1168                                 if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1169                                         response[0] = VDO(adev->svid, 1,
1170                                                           CMD_EXIT_MODE);
1171                                         response[0] |= VDO_OPOS(adev->mode);
1172                                         return 1;
1173                                 }
1174                         }
1175                         return 0;
1176                 case CMD_EXIT_MODE:
1177                         if (adev && pdev) {
1178                                 typec_altmode_update_active(pdev, false);
1179
1180                                 /* Back to USB Operation */
1181                                 WARN_ON(typec_altmode_notify(adev,
1182                                                              TYPEC_STATE_USB,
1183                                                              NULL));
1184                         }
1185                         break;
1186                 default:
1187                         break;
1188                 }
1189                 break;
1190         case CMDT_RSP_NAK:
1191                 switch (cmd) {
1192                 case CMD_ENTER_MODE:
1193                         /* Back to USB Operation */
1194                         if (adev)
1195                                 WARN_ON(typec_altmode_notify(adev,
1196                                                              TYPEC_STATE_USB,
1197                                                              NULL));
1198                         break;
1199                 default:
1200                         break;
1201                 }
1202                 break;
1203         default:
1204                 break;
1205         }
1206
1207         /* Informing the alternate mode drivers about everything */
1208         if (adev)
1209                 typec_altmode_vdm(adev, p[0], &p[1], cnt);
1210
1211         return rlen;
1212 }
1213
1214 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1215                                     const __le32 *payload, int cnt)
1216 {
1217         int rlen = 0;
1218         u32 response[8] = { };
1219         u32 p0 = le32_to_cpu(payload[0]);
1220
1221         if (port->vdm_state == VDM_STATE_BUSY) {
1222                 /* If UFP responded busy retry after timeout */
1223                 if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
1224                         port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1225                         port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
1226                                 CMDT_INIT;
1227                         mod_delayed_work(port->wq, &port->vdm_state_machine,
1228                                          msecs_to_jiffies(PD_T_VDM_BUSY));
1229                         return;
1230                 }
1231                 port->vdm_state = VDM_STATE_DONE;
1232         }
1233
1234         if (PD_VDO_SVDM(p0))
1235                 rlen = tcpm_pd_svdm(port, payload, cnt, response);
1236
1237         if (rlen > 0) {
1238                 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1239                 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1240         }
1241 }
1242
1243 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1244                           const u32 *data, int count)
1245 {
1246         u32 header;
1247
1248         if (WARN_ON(count > VDO_MAX_SIZE - 1))
1249                 count = VDO_MAX_SIZE - 1;
1250
1251         /* set VDM header with VID & CMD */
1252         header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1253                         1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1254         tcpm_queue_vdm(port, header, data, count);
1255
1256         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1257 }
1258
1259 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1260 {
1261         unsigned int timeout;
1262         int cmd = PD_VDO_CMD(vdm_hdr);
1263
1264         /* its not a structured VDM command */
1265         if (!PD_VDO_SVDM(vdm_hdr))
1266                 return PD_T_VDM_UNSTRUCTURED;
1267
1268         switch (PD_VDO_CMDT(vdm_hdr)) {
1269         case CMDT_INIT:
1270                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1271                         timeout = PD_T_VDM_WAIT_MODE_E;
1272                 else
1273                         timeout = PD_T_VDM_SNDR_RSP;
1274                 break;
1275         default:
1276                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1277                         timeout = PD_T_VDM_E_MODE;
1278                 else
1279                         timeout = PD_T_VDM_RCVR_RSP;
1280                 break;
1281         }
1282         return timeout;
1283 }
1284
1285 static void vdm_run_state_machine(struct tcpm_port *port)
1286 {
1287         struct pd_message msg;
1288         int i, res;
1289
1290         switch (port->vdm_state) {
1291         case VDM_STATE_READY:
1292                 /* Only transmit VDM if attached */
1293                 if (!port->attached) {
1294                         port->vdm_state = VDM_STATE_ERR_BUSY;
1295                         break;
1296                 }
1297
1298                 /*
1299                  * if there's traffic or we're not in PDO ready state don't send
1300                  * a VDM.
1301                  */
1302                 if (port->state != SRC_READY && port->state != SNK_READY)
1303                         break;
1304
1305                 /* Prepare and send VDM */
1306                 memset(&msg, 0, sizeof(msg));
1307                 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1308                                           port->pwr_role,
1309                                           port->data_role,
1310                                           port->negotiated_rev,
1311                                           port->message_id, port->vdo_count);
1312                 for (i = 0; i < port->vdo_count; i++)
1313                         msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1314                 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1315                 if (res < 0) {
1316                         port->vdm_state = VDM_STATE_ERR_SEND;
1317                 } else {
1318                         unsigned long timeout;
1319
1320                         port->vdm_retries = 0;
1321                         port->vdm_state = VDM_STATE_BUSY;
1322                         timeout = vdm_ready_timeout(port->vdo_data[0]);
1323                         mod_delayed_work(port->wq, &port->vdm_state_machine,
1324                                          timeout);
1325                 }
1326                 break;
1327         case VDM_STATE_WAIT_RSP_BUSY:
1328                 port->vdo_data[0] = port->vdo_retry;
1329                 port->vdo_count = 1;
1330                 port->vdm_state = VDM_STATE_READY;
1331                 break;
1332         case VDM_STATE_BUSY:
1333                 port->vdm_state = VDM_STATE_ERR_TMOUT;
1334                 break;
1335         case VDM_STATE_ERR_SEND:
1336                 /*
1337                  * A partner which does not support USB PD will not reply,
1338                  * so this is not a fatal error. At the same time, some
1339                  * devices may not return GoodCRC under some circumstances,
1340                  * so we need to retry.
1341                  */
1342                 if (port->vdm_retries < 3) {
1343                         tcpm_log(port, "VDM Tx error, retry");
1344                         port->vdm_retries++;
1345                         port->vdm_state = VDM_STATE_READY;
1346                 }
1347                 break;
1348         default:
1349                 break;
1350         }
1351 }
1352
1353 static void vdm_state_machine_work(struct work_struct *work)
1354 {
1355         struct tcpm_port *port = container_of(work, struct tcpm_port,
1356                                               vdm_state_machine.work);
1357         enum vdm_states prev_state;
1358
1359         mutex_lock(&port->lock);
1360
1361         /*
1362          * Continue running as long as the port is not busy and there was
1363          * a state change.
1364          */
1365         do {
1366                 prev_state = port->vdm_state;
1367                 vdm_run_state_machine(port);
1368         } while (port->vdm_state != prev_state &&
1369                  port->vdm_state != VDM_STATE_BUSY);
1370
1371         mutex_unlock(&port->lock);
1372 }
1373
1374 enum pdo_err {
1375         PDO_NO_ERR,
1376         PDO_ERR_NO_VSAFE5V,
1377         PDO_ERR_VSAFE5V_NOT_FIRST,
1378         PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
1379         PDO_ERR_FIXED_NOT_SORTED,
1380         PDO_ERR_VARIABLE_BATT_NOT_SORTED,
1381         PDO_ERR_DUPE_PDO,
1382         PDO_ERR_PPS_APDO_NOT_SORTED,
1383         PDO_ERR_DUPE_PPS_APDO,
1384 };
1385
1386 static const char * const pdo_err_msg[] = {
1387         [PDO_ERR_NO_VSAFE5V] =
1388         " err: source/sink caps should atleast have vSafe5V",
1389         [PDO_ERR_VSAFE5V_NOT_FIRST] =
1390         " err: vSafe5V Fixed Supply Object Shall always be the first object",
1391         [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
1392         " err: PDOs should be in the following order: Fixed; Battery; Variable",
1393         [PDO_ERR_FIXED_NOT_SORTED] =
1394         " err: Fixed supply pdos should be in increasing order of their fixed voltage",
1395         [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
1396         " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
1397         [PDO_ERR_DUPE_PDO] =
1398         " err: Variable/Batt supply pdos cannot have same min/max voltage",
1399         [PDO_ERR_PPS_APDO_NOT_SORTED] =
1400         " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
1401         [PDO_ERR_DUPE_PPS_APDO] =
1402         " err: Programmable power supply apdos cannot have same min/max voltage and max current",
1403 };
1404
1405 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
1406                                   unsigned int nr_pdo)
1407 {
1408         unsigned int i;
1409
1410         /* Should at least contain vSafe5v */
1411         if (nr_pdo < 1)
1412                 return PDO_ERR_NO_VSAFE5V;
1413
1414         /* The vSafe5V Fixed Supply Object Shall always be the first object */
1415         if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
1416             pdo_fixed_voltage(pdo[0]) != VSAFE5V)
1417                 return PDO_ERR_VSAFE5V_NOT_FIRST;
1418
1419         for (i = 1; i < nr_pdo; i++) {
1420                 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
1421                         return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
1422                 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
1423                         enum pd_pdo_type type = pdo_type(pdo[i]);
1424
1425                         switch (type) {
1426                         /*
1427                          * The remaining Fixed Supply Objects, if
1428                          * present, shall be sent in voltage order;
1429                          * lowest to highest.
1430                          */
1431                         case PDO_TYPE_FIXED:
1432                                 if (pdo_fixed_voltage(pdo[i]) <=
1433                                     pdo_fixed_voltage(pdo[i - 1]))
1434                                         return PDO_ERR_FIXED_NOT_SORTED;
1435                                 break;
1436                         /*
1437                          * The Battery Supply Objects and Variable
1438                          * supply, if present shall be sent in Minimum
1439                          * Voltage order; lowest to highest.
1440                          */
1441                         case PDO_TYPE_VAR:
1442                         case PDO_TYPE_BATT:
1443                                 if (pdo_min_voltage(pdo[i]) <
1444                                     pdo_min_voltage(pdo[i - 1]))
1445                                         return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
1446                                 else if ((pdo_min_voltage(pdo[i]) ==
1447                                           pdo_min_voltage(pdo[i - 1])) &&
1448                                          (pdo_max_voltage(pdo[i]) ==
1449                                           pdo_min_voltage(pdo[i - 1])))
1450                                         return PDO_ERR_DUPE_PDO;
1451                                 break;
1452                         /*
1453                          * The Programmable Power Supply APDOs, if present,
1454                          * shall be sent in Maximum Voltage order;
1455                          * lowest to highest.
1456                          */
1457                         case PDO_TYPE_APDO:
1458                                 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
1459                                         break;
1460
1461                                 if (pdo_pps_apdo_max_voltage(pdo[i]) <
1462                                     pdo_pps_apdo_max_voltage(pdo[i - 1]))
1463                                         return PDO_ERR_PPS_APDO_NOT_SORTED;
1464                                 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
1465                                           pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
1466                                          pdo_pps_apdo_max_voltage(pdo[i]) ==
1467                                           pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
1468                                          pdo_pps_apdo_max_current(pdo[i]) ==
1469                                           pdo_pps_apdo_max_current(pdo[i - 1]))
1470                                         return PDO_ERR_DUPE_PPS_APDO;
1471                                 break;
1472                         default:
1473                                 tcpm_log_force(port, " Unknown pdo type");
1474                         }
1475                 }
1476         }
1477
1478         return PDO_NO_ERR;
1479 }
1480
1481 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
1482                               unsigned int nr_pdo)
1483 {
1484         enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
1485
1486         if (err_index != PDO_NO_ERR) {
1487                 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
1488                 return -EINVAL;
1489         }
1490
1491         return 0;
1492 }
1493
1494 static int tcpm_altmode_enter(struct typec_altmode *altmode)
1495 {
1496         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1497         u32 header;
1498
1499         mutex_lock(&port->lock);
1500         header = VDO(altmode->svid, 1, CMD_ENTER_MODE);
1501         header |= VDO_OPOS(altmode->mode);
1502
1503         tcpm_queue_vdm(port, header, NULL, 0);
1504         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1505         mutex_unlock(&port->lock);
1506
1507         return 0;
1508 }
1509
1510 static int tcpm_altmode_exit(struct typec_altmode *altmode)
1511 {
1512         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1513         u32 header;
1514
1515         mutex_lock(&port->lock);
1516         header = VDO(altmode->svid, 1, CMD_EXIT_MODE);
1517         header |= VDO_OPOS(altmode->mode);
1518
1519         tcpm_queue_vdm(port, header, NULL, 0);
1520         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1521         mutex_unlock(&port->lock);
1522
1523         return 0;
1524 }
1525
1526 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
1527                             u32 header, const u32 *data, int count)
1528 {
1529         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1530
1531         mutex_lock(&port->lock);
1532         tcpm_queue_vdm(port, header, data, count - 1);
1533         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1534         mutex_unlock(&port->lock);
1535
1536         return 0;
1537 }
1538
1539 static const struct typec_altmode_ops tcpm_altmode_ops = {
1540         .enter = tcpm_altmode_enter,
1541         .exit = tcpm_altmode_exit,
1542         .vdm = tcpm_altmode_vdm,
1543 };
1544
1545 /*
1546  * PD (data, control) command handling functions
1547  */
1548 static inline enum tcpm_state ready_state(struct tcpm_port *port)
1549 {
1550         if (port->pwr_role == TYPEC_SOURCE)
1551                 return SRC_READY;
1552         else
1553                 return SNK_READY;
1554 }
1555
1556 static int tcpm_pd_send_control(struct tcpm_port *port,
1557                                 enum pd_ctrl_msg_type type);
1558
1559 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
1560                               int cnt)
1561 {
1562         u32 p0 = le32_to_cpu(payload[0]);
1563         unsigned int type = usb_pd_ado_type(p0);
1564
1565         if (!type) {
1566                 tcpm_log(port, "Alert message received with no type");
1567                 return;
1568         }
1569
1570         /* Just handling non-battery alerts for now */
1571         if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
1572                 switch (port->state) {
1573                 case SRC_READY:
1574                 case SNK_READY:
1575                         tcpm_set_state(port, GET_STATUS_SEND, 0);
1576                         break;
1577                 default:
1578                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1579                         break;
1580                 }
1581         }
1582 }
1583
1584 static void tcpm_pd_data_request(struct tcpm_port *port,
1585                                  const struct pd_message *msg)
1586 {
1587         enum pd_data_msg_type type = pd_header_type_le(msg->header);
1588         unsigned int cnt = pd_header_cnt_le(msg->header);
1589         unsigned int rev = pd_header_rev_le(msg->header);
1590         unsigned int i;
1591
1592         switch (type) {
1593         case PD_DATA_SOURCE_CAP:
1594                 if (port->pwr_role != TYPEC_SINK)
1595                         break;
1596
1597                 for (i = 0; i < cnt; i++)
1598                         port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1599
1600                 port->nr_source_caps = cnt;
1601
1602                 tcpm_log_source_caps(port);
1603
1604                 tcpm_validate_caps(port, port->source_caps,
1605                                    port->nr_source_caps);
1606
1607                 /*
1608                  * Adjust revision in subsequent message headers, as required,
1609                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1610                  * support Rev 1.0 so just do nothing in that scenario.
1611                  */
1612                 if (rev == PD_REV10)
1613                         break;
1614
1615                 if (rev < PD_MAX_REV)
1616                         port->negotiated_rev = rev;
1617
1618                 /*
1619                  * This message may be received even if VBUS is not
1620                  * present. This is quite unexpected; see USB PD
1621                  * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1622                  * However, at the same time, we must be ready to
1623                  * receive this message and respond to it 15ms after
1624                  * receiving PS_RDY during power swap operations, no matter
1625                  * if VBUS is available or not (USB PD specification,
1626                  * section 6.5.9.2).
1627                  * So we need to accept the message either way,
1628                  * but be prepared to keep waiting for VBUS after it was
1629                  * handled.
1630                  */
1631                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1632                 break;
1633         case PD_DATA_REQUEST:
1634                 if (port->pwr_role != TYPEC_SOURCE ||
1635                     cnt != 1) {
1636                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1637                         break;
1638                 }
1639
1640                 /*
1641                  * Adjust revision in subsequent message headers, as required,
1642                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1643                  * support Rev 1.0 so just reject in that scenario.
1644                  */
1645                 if (rev == PD_REV10) {
1646                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1647                         break;
1648                 }
1649
1650                 if (rev < PD_MAX_REV)
1651                         port->negotiated_rev = rev;
1652
1653                 port->sink_request = le32_to_cpu(msg->payload[0]);
1654                 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1655                 break;
1656         case PD_DATA_SINK_CAP:
1657                 /* We don't do anything with this at the moment... */
1658                 for (i = 0; i < cnt; i++)
1659                         port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1660                 port->nr_sink_caps = cnt;
1661                 break;
1662         case PD_DATA_VENDOR_DEF:
1663                 tcpm_handle_vdm_request(port, msg->payload, cnt);
1664                 break;
1665         case PD_DATA_BIST:
1666                 if (port->state == SRC_READY || port->state == SNK_READY) {
1667                         port->bist_request = le32_to_cpu(msg->payload[0]);
1668                         tcpm_set_state(port, BIST_RX, 0);
1669                 }
1670                 break;
1671         case PD_DATA_ALERT:
1672                 tcpm_handle_alert(port, msg->payload, cnt);
1673                 break;
1674         case PD_DATA_BATT_STATUS:
1675         case PD_DATA_GET_COUNTRY_INFO:
1676                 /* Currently unsupported */
1677                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1678                 break;
1679         default:
1680                 tcpm_log(port, "Unhandled data message type %#x", type);
1681                 break;
1682         }
1683 }
1684
1685 static void tcpm_pps_complete(struct tcpm_port *port, int result)
1686 {
1687         if (port->pps_pending) {
1688                 port->pps_status = result;
1689                 port->pps_pending = false;
1690                 complete(&port->pps_complete);
1691         }
1692 }
1693
1694 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1695                                  const struct pd_message *msg)
1696 {
1697         enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1698         enum tcpm_state next_state;
1699
1700         switch (type) {
1701         case PD_CTRL_GOOD_CRC:
1702         case PD_CTRL_PING:
1703                 break;
1704         case PD_CTRL_GET_SOURCE_CAP:
1705                 switch (port->state) {
1706                 case SRC_READY:
1707                 case SNK_READY:
1708                         tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1709                         break;
1710                 default:
1711                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1712                         break;
1713                 }
1714                 break;
1715         case PD_CTRL_GET_SINK_CAP:
1716                 switch (port->state) {
1717                 case SRC_READY:
1718                 case SNK_READY:
1719                         tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1720                         break;
1721                 default:
1722                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1723                         break;
1724                 }
1725                 break;
1726         case PD_CTRL_GOTO_MIN:
1727                 break;
1728         case PD_CTRL_PS_RDY:
1729                 switch (port->state) {
1730                 case SNK_TRANSITION_SINK:
1731                         if (port->vbus_present) {
1732                                 tcpm_set_current_limit(port,
1733                                                        port->current_limit,
1734                                                        port->supply_voltage);
1735                                 port->explicit_contract = true;
1736                                 tcpm_set_state(port, SNK_READY, 0);
1737                         } else {
1738                                 /*
1739                                  * Seen after power swap. Keep waiting for VBUS
1740                                  * in a transitional state.
1741                                  */
1742                                 tcpm_set_state(port,
1743                                                SNK_TRANSITION_SINK_VBUS, 0);
1744                         }
1745                         break;
1746                 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
1747                         tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1748                         break;
1749                 case PR_SWAP_SNK_SRC_SINK_OFF:
1750                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1751                         break;
1752                 case VCONN_SWAP_WAIT_FOR_VCONN:
1753                         tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1754                         break;
1755                 default:
1756                         break;
1757                 }
1758                 break;
1759         case PD_CTRL_REJECT:
1760         case PD_CTRL_WAIT:
1761         case PD_CTRL_NOT_SUPP:
1762                 switch (port->state) {
1763                 case SNK_NEGOTIATE_CAPABILITIES:
1764                         /* USB PD specification, Figure 8-43 */
1765                         if (port->explicit_contract)
1766                                 next_state = SNK_READY;
1767                         else
1768                                 next_state = SNK_WAIT_CAPABILITIES;
1769                         tcpm_set_state(port, next_state, 0);
1770                         break;
1771                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1772                         /* Revert data back from any requested PPS updates */
1773                         port->pps_data.out_volt = port->supply_voltage;
1774                         port->pps_data.op_curr = port->current_limit;
1775                         port->pps_status = (type == PD_CTRL_WAIT ?
1776                                             -EAGAIN : -EOPNOTSUPP);
1777                         tcpm_set_state(port, SNK_READY, 0);
1778                         break;
1779                 case DR_SWAP_SEND:
1780                         port->swap_status = (type == PD_CTRL_WAIT ?
1781                                              -EAGAIN : -EOPNOTSUPP);
1782                         tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1783                         break;
1784                 case PR_SWAP_SEND:
1785                         port->swap_status = (type == PD_CTRL_WAIT ?
1786                                              -EAGAIN : -EOPNOTSUPP);
1787                         tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1788                         break;
1789                 case VCONN_SWAP_SEND:
1790                         port->swap_status = (type == PD_CTRL_WAIT ?
1791                                              -EAGAIN : -EOPNOTSUPP);
1792                         tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1793                         break;
1794                 default:
1795                         break;
1796                 }
1797                 break;
1798         case PD_CTRL_ACCEPT:
1799                 switch (port->state) {
1800                 case SNK_NEGOTIATE_CAPABILITIES:
1801                         port->pps_data.active = false;
1802                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1803                         break;
1804                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1805                         port->pps_data.active = true;
1806                         port->supply_voltage = port->pps_data.out_volt;
1807                         port->current_limit = port->pps_data.op_curr;
1808                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1809                         break;
1810                 case SOFT_RESET_SEND:
1811                         port->message_id = 0;
1812                         port->rx_msgid = -1;
1813                         if (port->pwr_role == TYPEC_SOURCE)
1814                                 next_state = SRC_SEND_CAPABILITIES;
1815                         else
1816                                 next_state = SNK_WAIT_CAPABILITIES;
1817                         tcpm_set_state(port, next_state, 0);
1818                         break;
1819                 case DR_SWAP_SEND:
1820                         tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1821                         break;
1822                 case PR_SWAP_SEND:
1823                         tcpm_set_state(port, PR_SWAP_START, 0);
1824                         break;
1825                 case VCONN_SWAP_SEND:
1826                         tcpm_set_state(port, VCONN_SWAP_START, 0);
1827                         break;
1828                 default:
1829                         break;
1830                 }
1831                 break;
1832         case PD_CTRL_SOFT_RESET:
1833                 tcpm_set_state(port, SOFT_RESET, 0);
1834                 break;
1835         case PD_CTRL_DR_SWAP:
1836                 if (port->port_type != TYPEC_PORT_DRP) {
1837                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1838                         break;
1839                 }
1840                 /*
1841                  * XXX
1842                  * 6.3.9: If an alternate mode is active, a request to swap
1843                  * alternate modes shall trigger a port reset.
1844                  */
1845                 switch (port->state) {
1846                 case SRC_READY:
1847                 case SNK_READY:
1848                         tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
1849                         break;
1850                 default:
1851                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1852                         break;
1853                 }
1854                 break;
1855         case PD_CTRL_PR_SWAP:
1856                 if (port->port_type != TYPEC_PORT_DRP) {
1857                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1858                         break;
1859                 }
1860                 switch (port->state) {
1861                 case SRC_READY:
1862                 case SNK_READY:
1863                         tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
1864                         break;
1865                 default:
1866                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1867                         break;
1868                 }
1869                 break;
1870         case PD_CTRL_VCONN_SWAP:
1871                 switch (port->state) {
1872                 case SRC_READY:
1873                 case SNK_READY:
1874                         tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
1875                         break;
1876                 default:
1877                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1878                         break;
1879                 }
1880                 break;
1881         case PD_CTRL_GET_SOURCE_CAP_EXT:
1882         case PD_CTRL_GET_STATUS:
1883         case PD_CTRL_FR_SWAP:
1884         case PD_CTRL_GET_PPS_STATUS:
1885         case PD_CTRL_GET_COUNTRY_CODES:
1886                 /* Currently not supported */
1887                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1888                 break;
1889         default:
1890                 tcpm_log(port, "Unhandled ctrl message type %#x", type);
1891                 break;
1892         }
1893 }
1894
1895 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
1896                                     const struct pd_message *msg)
1897 {
1898         enum pd_ext_msg_type type = pd_header_type_le(msg->header);
1899         unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
1900
1901         if (!(msg->ext_msg.header & PD_EXT_HDR_CHUNKED)) {
1902                 tcpm_log(port, "Unchunked extended messages unsupported");
1903                 return;
1904         }
1905
1906         if (data_size > PD_EXT_MAX_CHUNK_DATA) {
1907                 tcpm_log(port, "Chunk handling not yet supported");
1908                 return;
1909         }
1910
1911         switch (type) {
1912         case PD_EXT_STATUS:
1913                 /*
1914                  * If PPS related events raised then get PPS status to clear
1915                  * (see USB PD 3.0 Spec, 6.5.2.4)
1916                  */
1917                 if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
1918                     USB_PD_EXT_SDB_PPS_EVENTS)
1919                         tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
1920                 else
1921                         tcpm_set_state(port, ready_state(port), 0);
1922                 break;
1923         case PD_EXT_PPS_STATUS:
1924                 /*
1925                  * For now the PPS status message is used to clear events
1926                  * and nothing more.
1927                  */
1928                 tcpm_set_state(port, ready_state(port), 0);
1929                 break;
1930         case PD_EXT_SOURCE_CAP_EXT:
1931         case PD_EXT_GET_BATT_CAP:
1932         case PD_EXT_GET_BATT_STATUS:
1933         case PD_EXT_BATT_CAP:
1934         case PD_EXT_GET_MANUFACTURER_INFO:
1935         case PD_EXT_MANUFACTURER_INFO:
1936         case PD_EXT_SECURITY_REQUEST:
1937         case PD_EXT_SECURITY_RESPONSE:
1938         case PD_EXT_FW_UPDATE_REQUEST:
1939         case PD_EXT_FW_UPDATE_RESPONSE:
1940         case PD_EXT_COUNTRY_INFO:
1941         case PD_EXT_COUNTRY_CODES:
1942                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1943                 break;
1944         default:
1945                 tcpm_log(port, "Unhandled extended message type %#x", type);
1946                 break;
1947         }
1948 }
1949
1950 static void tcpm_pd_rx_handler(struct work_struct *work)
1951 {
1952         struct pd_rx_event *event = container_of(work,
1953                                                  struct pd_rx_event, work);
1954         const struct pd_message *msg = &event->msg;
1955         unsigned int cnt = pd_header_cnt_le(msg->header);
1956         struct tcpm_port *port = event->port;
1957
1958         mutex_lock(&port->lock);
1959
1960         tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
1961                  port->attached);
1962
1963         if (port->attached) {
1964                 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1965                 unsigned int msgid = pd_header_msgid_le(msg->header);
1966
1967                 /*
1968                  * USB PD standard, 6.6.1.2:
1969                  * "... if MessageID value in a received Message is the
1970                  * same as the stored value, the receiver shall return a
1971                  * GoodCRC Message with that MessageID value and drop
1972                  * the Message (this is a retry of an already received
1973                  * Message). Note: this shall not apply to the Soft_Reset
1974                  * Message which always has a MessageID value of zero."
1975                  */
1976                 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
1977                         goto done;
1978                 port->rx_msgid = msgid;
1979
1980                 /*
1981                  * If both ends believe to be DFP/host, we have a data role
1982                  * mismatch.
1983                  */
1984                 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
1985                     (port->data_role == TYPEC_HOST)) {
1986                         tcpm_log(port,
1987                                  "Data role mismatch, initiating error recovery");
1988                         tcpm_set_state(port, ERROR_RECOVERY, 0);
1989                 } else {
1990                         if (msg->header & PD_HEADER_EXT_HDR)
1991                                 tcpm_pd_ext_msg_request(port, msg);
1992                         else if (cnt)
1993                                 tcpm_pd_data_request(port, msg);
1994                         else
1995                                 tcpm_pd_ctrl_request(port, msg);
1996                 }
1997         }
1998
1999 done:
2000         mutex_unlock(&port->lock);
2001         kfree(event);
2002 }
2003
2004 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
2005 {
2006         struct pd_rx_event *event;
2007
2008         event = kzalloc(sizeof(*event), GFP_ATOMIC);
2009         if (!event)
2010                 return;
2011
2012         INIT_WORK(&event->work, tcpm_pd_rx_handler);
2013         event->port = port;
2014         memcpy(&event->msg, msg, sizeof(*msg));
2015         queue_work(port->wq, &event->work);
2016 }
2017 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
2018
2019 static int tcpm_pd_send_control(struct tcpm_port *port,
2020                                 enum pd_ctrl_msg_type type)
2021 {
2022         struct pd_message msg;
2023
2024         memset(&msg, 0, sizeof(msg));
2025         msg.header = PD_HEADER_LE(type, port->pwr_role,
2026                                   port->data_role,
2027                                   port->negotiated_rev,
2028                                   port->message_id, 0);
2029
2030         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2031 }
2032
2033 /*
2034  * Send queued message without affecting state.
2035  * Return true if state machine should go back to sleep,
2036  * false otherwise.
2037  */
2038 static bool tcpm_send_queued_message(struct tcpm_port *port)
2039 {
2040         enum pd_msg_request queued_message;
2041
2042         do {
2043                 queued_message = port->queued_message;
2044                 port->queued_message = PD_MSG_NONE;
2045
2046                 switch (queued_message) {
2047                 case PD_MSG_CTRL_WAIT:
2048                         tcpm_pd_send_control(port, PD_CTRL_WAIT);
2049                         break;
2050                 case PD_MSG_CTRL_REJECT:
2051                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
2052                         break;
2053                 case PD_MSG_CTRL_NOT_SUPP:
2054                         tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
2055                         break;
2056                 case PD_MSG_DATA_SINK_CAP:
2057                         tcpm_pd_send_sink_caps(port);
2058                         break;
2059                 case PD_MSG_DATA_SOURCE_CAP:
2060                         tcpm_pd_send_source_caps(port);
2061                         break;
2062                 default:
2063                         break;
2064                 }
2065         } while (port->queued_message != PD_MSG_NONE);
2066
2067         if (port->delayed_state != INVALID_STATE) {
2068                 if (time_is_after_jiffies(port->delayed_runtime)) {
2069                         mod_delayed_work(port->wq, &port->state_machine,
2070                                          port->delayed_runtime - jiffies);
2071                         return true;
2072                 }
2073                 port->delayed_state = INVALID_STATE;
2074         }
2075         return false;
2076 }
2077
2078 static int tcpm_pd_check_request(struct tcpm_port *port)
2079 {
2080         u32 pdo, rdo = port->sink_request;
2081         unsigned int max, op, pdo_max, index;
2082         enum pd_pdo_type type;
2083
2084         index = rdo_index(rdo);
2085         if (!index || index > port->nr_src_pdo)
2086                 return -EINVAL;
2087
2088         pdo = port->src_pdo[index - 1];
2089         type = pdo_type(pdo);
2090         switch (type) {
2091         case PDO_TYPE_FIXED:
2092         case PDO_TYPE_VAR:
2093                 max = rdo_max_current(rdo);
2094                 op = rdo_op_current(rdo);
2095                 pdo_max = pdo_max_current(pdo);
2096
2097                 if (op > pdo_max)
2098                         return -EINVAL;
2099                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2100                         return -EINVAL;
2101
2102                 if (type == PDO_TYPE_FIXED)
2103                         tcpm_log(port,
2104                                  "Requested %u mV, %u mA for %u / %u mA",
2105                                  pdo_fixed_voltage(pdo), pdo_max, op, max);
2106                 else
2107                         tcpm_log(port,
2108                                  "Requested %u -> %u mV, %u mA for %u / %u mA",
2109                                  pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2110                                  pdo_max, op, max);
2111                 break;
2112         case PDO_TYPE_BATT:
2113                 max = rdo_max_power(rdo);
2114                 op = rdo_op_power(rdo);
2115                 pdo_max = pdo_max_power(pdo);
2116
2117                 if (op > pdo_max)
2118                         return -EINVAL;
2119                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2120                         return -EINVAL;
2121                 tcpm_log(port,
2122                          "Requested %u -> %u mV, %u mW for %u / %u mW",
2123                          pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2124                          pdo_max, op, max);
2125                 break;
2126         default:
2127                 return -EINVAL;
2128         }
2129
2130         port->op_vsafe5v = index == 1;
2131
2132         return 0;
2133 }
2134
2135 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
2136 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
2137
2138 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
2139                               int *src_pdo)
2140 {
2141         unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
2142                      max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
2143                      min_snk_mv = 0;
2144         int ret = -EINVAL;
2145
2146         port->pps_data.supported = false;
2147         port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
2148
2149         /*
2150          * Select the source PDO providing the most power which has a
2151          * matchig sink cap.
2152          */
2153         for (i = 0; i < port->nr_source_caps; i++) {
2154                 u32 pdo = port->source_caps[i];
2155                 enum pd_pdo_type type = pdo_type(pdo);
2156
2157                 switch (type) {
2158                 case PDO_TYPE_FIXED:
2159                         max_src_mv = pdo_fixed_voltage(pdo);
2160                         min_src_mv = max_src_mv;
2161                         break;
2162                 case PDO_TYPE_BATT:
2163                 case PDO_TYPE_VAR:
2164                         max_src_mv = pdo_max_voltage(pdo);
2165                         min_src_mv = pdo_min_voltage(pdo);
2166                         break;
2167                 case PDO_TYPE_APDO:
2168                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
2169                                 port->pps_data.supported = true;
2170                                 port->usb_type =
2171                                         POWER_SUPPLY_USB_TYPE_PD_PPS;
2172                         }
2173                         continue;
2174                 default:
2175                         tcpm_log(port, "Invalid source PDO type, ignoring");
2176                         continue;
2177                 }
2178
2179                 switch (type) {
2180                 case PDO_TYPE_FIXED:
2181                 case PDO_TYPE_VAR:
2182                         src_ma = pdo_max_current(pdo);
2183                         src_mw = src_ma * min_src_mv / 1000;
2184                         break;
2185                 case PDO_TYPE_BATT:
2186                         src_mw = pdo_max_power(pdo);
2187                         break;
2188                 case PDO_TYPE_APDO:
2189                         continue;
2190                 default:
2191                         tcpm_log(port, "Invalid source PDO type, ignoring");
2192                         continue;
2193                 }
2194
2195                 for (j = 0; j < port->nr_snk_pdo; j++) {
2196                         pdo = port->snk_pdo[j];
2197
2198                         switch (pdo_type(pdo)) {
2199                         case PDO_TYPE_FIXED:
2200                                 max_snk_mv = pdo_fixed_voltage(pdo);
2201                                 min_snk_mv = max_snk_mv;
2202                                 break;
2203                         case PDO_TYPE_BATT:
2204                         case PDO_TYPE_VAR:
2205                                 max_snk_mv = pdo_max_voltage(pdo);
2206                                 min_snk_mv = pdo_min_voltage(pdo);
2207                                 break;
2208                         case PDO_TYPE_APDO:
2209                                 continue;
2210                         default:
2211                                 tcpm_log(port, "Invalid sink PDO type, ignoring");
2212                                 continue;
2213                         }
2214
2215                         if (max_src_mv <= max_snk_mv &&
2216                                 min_src_mv >= min_snk_mv) {
2217                                 /* Prefer higher voltages if available */
2218                                 if ((src_mw == max_mw && min_src_mv > max_mv) ||
2219                                                         src_mw > max_mw) {
2220                                         *src_pdo = i;
2221                                         *sink_pdo = j;
2222                                         max_mw = src_mw;
2223                                         max_mv = min_src_mv;
2224                                         ret = 0;
2225                                 }
2226                         }
2227                 }
2228         }
2229
2230         return ret;
2231 }
2232
2233 #define min_pps_apdo_current(x, y)      \
2234         min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
2235
2236 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
2237 {
2238         unsigned int i, j, max_mw = 0, max_mv = 0;
2239         unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
2240         unsigned int min_snk_mv, max_snk_mv;
2241         unsigned int max_op_mv;
2242         u32 pdo, src, snk;
2243         unsigned int src_pdo = 0, snk_pdo = 0;
2244
2245         /*
2246          * Select the source PPS APDO providing the most power while staying
2247          * within the board's limits. We skip the first PDO as this is always
2248          * 5V 3A.
2249          */
2250         for (i = 1; i < port->nr_source_caps; ++i) {
2251                 pdo = port->source_caps[i];
2252
2253                 switch (pdo_type(pdo)) {
2254                 case PDO_TYPE_APDO:
2255                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2256                                 tcpm_log(port, "Not PPS APDO (source), ignoring");
2257                                 continue;
2258                         }
2259
2260                         min_src_mv = pdo_pps_apdo_min_voltage(pdo);
2261                         max_src_mv = pdo_pps_apdo_max_voltage(pdo);
2262                         src_ma = pdo_pps_apdo_max_current(pdo);
2263                         src_mw = (src_ma * max_src_mv) / 1000;
2264
2265                         /*
2266                          * Now search through the sink PDOs to find a matching
2267                          * PPS APDO. Again skip the first sink PDO as this will
2268                          * always be 5V 3A.
2269                          */
2270                         for (j = 1; j < port->nr_snk_pdo; j++) {
2271                                 pdo = port->snk_pdo[j];
2272
2273                                 switch (pdo_type(pdo)) {
2274                                 case PDO_TYPE_APDO:
2275                                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2276                                                 tcpm_log(port,
2277                                                          "Not PPS APDO (sink), ignoring");
2278                                                 continue;
2279                                         }
2280
2281                                         min_snk_mv =
2282                                                 pdo_pps_apdo_min_voltage(pdo);
2283                                         max_snk_mv =
2284                                                 pdo_pps_apdo_max_voltage(pdo);
2285                                         break;
2286                                 default:
2287                                         tcpm_log(port,
2288                                                  "Not APDO type (sink), ignoring");
2289                                         continue;
2290                                 }
2291
2292                                 if (min_src_mv <= max_snk_mv &&
2293                                     max_src_mv >= min_snk_mv) {
2294                                         max_op_mv = min(max_src_mv, max_snk_mv);
2295                                         src_mw = (max_op_mv * src_ma) / 1000;
2296                                         /* Prefer higher voltages if available */
2297                                         if ((src_mw == max_mw &&
2298                                              max_op_mv > max_mv) ||
2299                                             src_mw > max_mw) {
2300                                                 src_pdo = i;
2301                                                 snk_pdo = j;
2302                                                 max_mw = src_mw;
2303                                                 max_mv = max_op_mv;
2304                                         }
2305                                 }
2306                         }
2307
2308                         break;
2309                 default:
2310                         tcpm_log(port, "Not APDO type (source), ignoring");
2311                         continue;
2312                 }
2313         }
2314
2315         if (src_pdo) {
2316                 src = port->source_caps[src_pdo];
2317                 snk = port->snk_pdo[snk_pdo];
2318
2319                 port->pps_data.min_volt = max(pdo_pps_apdo_min_voltage(src),
2320                                               pdo_pps_apdo_min_voltage(snk));
2321                 port->pps_data.max_volt = min(pdo_pps_apdo_max_voltage(src),
2322                                               pdo_pps_apdo_max_voltage(snk));
2323                 port->pps_data.max_curr = min_pps_apdo_current(src, snk);
2324                 port->pps_data.out_volt = min(port->pps_data.max_volt,
2325                                               max(port->pps_data.min_volt,
2326                                                   port->pps_data.out_volt));
2327                 port->pps_data.op_curr = min(port->pps_data.max_curr,
2328                                              port->pps_data.op_curr);
2329         }
2330
2331         return src_pdo;
2332 }
2333
2334 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
2335 {
2336         unsigned int mv, ma, mw, flags;
2337         unsigned int max_ma, max_mw;
2338         enum pd_pdo_type type;
2339         u32 pdo, matching_snk_pdo;
2340         int src_pdo_index = 0;
2341         int snk_pdo_index = 0;
2342         int ret;
2343
2344         ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
2345         if (ret < 0)
2346                 return ret;
2347
2348         pdo = port->source_caps[src_pdo_index];
2349         matching_snk_pdo = port->snk_pdo[snk_pdo_index];
2350         type = pdo_type(pdo);
2351
2352         switch (type) {
2353         case PDO_TYPE_FIXED:
2354                 mv = pdo_fixed_voltage(pdo);
2355                 break;
2356         case PDO_TYPE_BATT:
2357         case PDO_TYPE_VAR:
2358                 mv = pdo_min_voltage(pdo);
2359                 break;
2360         default:
2361                 tcpm_log(port, "Invalid PDO selected!");
2362                 return -EINVAL;
2363         }
2364
2365         /* Select maximum available current within the sink pdo's limit */
2366         if (type == PDO_TYPE_BATT) {
2367                 mw = min_power(pdo, matching_snk_pdo);
2368                 ma = 1000 * mw / mv;
2369         } else {
2370                 ma = min_current(pdo, matching_snk_pdo);
2371                 mw = ma * mv / 1000;
2372         }
2373
2374         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2375
2376         /* Set mismatch bit if offered power is less than operating power */
2377         max_ma = ma;
2378         max_mw = mw;
2379         if (mw < port->operating_snk_mw) {
2380                 flags |= RDO_CAP_MISMATCH;
2381                 if (type == PDO_TYPE_BATT &&
2382                     (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
2383                         max_mw = pdo_max_power(matching_snk_pdo);
2384                 else if (pdo_max_current(matching_snk_pdo) >
2385                          pdo_max_current(pdo))
2386                         max_ma = pdo_max_current(matching_snk_pdo);
2387         }
2388
2389         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2390                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
2391                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2392                  port->polarity);
2393
2394         if (type == PDO_TYPE_BATT) {
2395                 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
2396
2397                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
2398                          src_pdo_index, mv, mw,
2399                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2400         } else {
2401                 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
2402
2403                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
2404                          src_pdo_index, mv, ma,
2405                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2406         }
2407
2408         port->current_limit = ma;
2409         port->supply_voltage = mv;
2410
2411         return 0;
2412 }
2413
2414 static int tcpm_pd_send_request(struct tcpm_port *port)
2415 {
2416         struct pd_message msg;
2417         int ret;
2418         u32 rdo;
2419
2420         ret = tcpm_pd_build_request(port, &rdo);
2421         if (ret < 0)
2422                 return ret;
2423
2424         memset(&msg, 0, sizeof(msg));
2425         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2426                                   port->pwr_role,
2427                                   port->data_role,
2428                                   port->negotiated_rev,
2429                                   port->message_id, 1);
2430         msg.payload[0] = cpu_to_le32(rdo);
2431
2432         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2433 }
2434
2435 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
2436 {
2437         unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
2438         enum pd_pdo_type type;
2439         unsigned int src_pdo_index;
2440         u32 pdo;
2441
2442         src_pdo_index = tcpm_pd_select_pps_apdo(port);
2443         if (!src_pdo_index)
2444                 return -EOPNOTSUPP;
2445
2446         pdo = port->source_caps[src_pdo_index];
2447         type = pdo_type(pdo);
2448
2449         switch (type) {
2450         case PDO_TYPE_APDO:
2451                 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2452                         tcpm_log(port, "Invalid APDO selected!");
2453                         return -EINVAL;
2454                 }
2455                 max_mv = port->pps_data.max_volt;
2456                 max_ma = port->pps_data.max_curr;
2457                 out_mv = port->pps_data.out_volt;
2458                 op_ma = port->pps_data.op_curr;
2459                 break;
2460         default:
2461                 tcpm_log(port, "Invalid PDO selected!");
2462                 return -EINVAL;
2463         }
2464
2465         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2466
2467         op_mw = (op_ma * out_mv) / 1000;
2468         if (op_mw < port->operating_snk_mw) {
2469                 /*
2470                  * Try raising current to meet power needs. If that's not enough
2471                  * then try upping the voltage. If that's still not enough
2472                  * then we've obviously chosen a PPS APDO which really isn't
2473                  * suitable so abandon ship.
2474                  */
2475                 op_ma = (port->operating_snk_mw * 1000) / out_mv;
2476                 if ((port->operating_snk_mw * 1000) % out_mv)
2477                         ++op_ma;
2478                 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
2479
2480                 if (op_ma > max_ma) {
2481                         op_ma = max_ma;
2482                         out_mv = (port->operating_snk_mw * 1000) / op_ma;
2483                         if ((port->operating_snk_mw * 1000) % op_ma)
2484                                 ++out_mv;
2485                         out_mv += RDO_PROG_VOLT_MV_STEP -
2486                                   (out_mv % RDO_PROG_VOLT_MV_STEP);
2487
2488                         if (out_mv > max_mv) {
2489                                 tcpm_log(port, "Invalid PPS APDO selected!");
2490                                 return -EINVAL;
2491                         }
2492                 }
2493         }
2494
2495         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2496                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
2497                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2498                  port->polarity);
2499
2500         *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
2501
2502         tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
2503                  src_pdo_index, out_mv, op_ma);
2504
2505         port->pps_data.op_curr = op_ma;
2506         port->pps_data.out_volt = out_mv;
2507
2508         return 0;
2509 }
2510
2511 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
2512 {
2513         struct pd_message msg;
2514         int ret;
2515         u32 rdo;
2516
2517         ret = tcpm_pd_build_pps_request(port, &rdo);
2518         if (ret < 0)
2519                 return ret;
2520
2521         memset(&msg, 0, sizeof(msg));
2522         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2523                                   port->pwr_role,
2524                                   port->data_role,
2525                                   port->negotiated_rev,
2526                                   port->message_id, 1);
2527         msg.payload[0] = cpu_to_le32(rdo);
2528
2529         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2530 }
2531
2532 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
2533 {
2534         int ret;
2535
2536         if (enable && port->vbus_charge)
2537                 return -EINVAL;
2538
2539         tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
2540
2541         ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
2542         if (ret < 0)
2543                 return ret;
2544
2545         port->vbus_source = enable;
2546         return 0;
2547 }
2548
2549 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
2550 {
2551         int ret;
2552
2553         if (charge && port->vbus_source)
2554                 return -EINVAL;
2555
2556         if (charge != port->vbus_charge) {
2557                 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
2558                 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
2559                                            charge);
2560                 if (ret < 0)
2561                         return ret;
2562         }
2563         port->vbus_charge = charge;
2564         return 0;
2565 }
2566
2567 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
2568 {
2569         int ret;
2570
2571         if (!port->tcpc->start_toggling)
2572                 return false;
2573
2574         tcpm_log_force(port, "Start toggling");
2575         ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
2576         return ret == 0;
2577 }
2578
2579 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
2580 {
2581         tcpm_log(port, "cc:=%d", cc);
2582         port->cc_req = cc;
2583         port->tcpc->set_cc(port->tcpc, cc);
2584 }
2585
2586 static int tcpm_init_vbus(struct tcpm_port *port)
2587 {
2588         int ret;
2589
2590         ret = port->tcpc->set_vbus(port->tcpc, false, false);
2591         port->vbus_source = false;
2592         port->vbus_charge = false;
2593         return ret;
2594 }
2595
2596 static int tcpm_init_vconn(struct tcpm_port *port)
2597 {
2598         int ret;
2599
2600         ret = port->tcpc->set_vconn(port->tcpc, false);
2601         port->vconn_role = TYPEC_SINK;
2602         return ret;
2603 }
2604
2605 static void tcpm_typec_connect(struct tcpm_port *port)
2606 {
2607         if (!port->connected) {
2608                 /* Make sure we don't report stale identity information */
2609                 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
2610                 port->partner_desc.usb_pd = port->pd_capable;
2611                 if (tcpm_port_is_debug(port))
2612                         port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
2613                 else if (tcpm_port_is_audio(port))
2614                         port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
2615                 else
2616                         port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
2617                 port->partner = typec_register_partner(port->typec_port,
2618                                                        &port->partner_desc);
2619                 port->connected = true;
2620         }
2621 }
2622
2623 static int tcpm_src_attach(struct tcpm_port *port)
2624 {
2625         enum typec_cc_polarity polarity =
2626                                 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
2627                                                          : TYPEC_POLARITY_CC1;
2628         int ret;
2629
2630         if (port->attached)
2631                 return 0;
2632
2633         ret = tcpm_set_polarity(port, polarity);
2634         if (ret < 0)
2635                 return ret;
2636
2637         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2638         if (ret < 0)
2639                 return ret;
2640
2641         ret = port->tcpc->set_pd_rx(port->tcpc, true);
2642         if (ret < 0)
2643                 goto out_disable_mux;
2644
2645         /*
2646          * USB Type-C specification, version 1.2,
2647          * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
2648          * Enable VCONN only if the non-RD port is set to RA.
2649          */
2650         if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
2651             (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
2652                 ret = tcpm_set_vconn(port, true);
2653                 if (ret < 0)
2654                         goto out_disable_pd;
2655         }
2656
2657         ret = tcpm_set_vbus(port, true);
2658         if (ret < 0)
2659                 goto out_disable_vconn;
2660
2661         port->pd_capable = false;
2662
2663         port->partner = NULL;
2664
2665         port->attached = true;
2666         port->send_discover = true;
2667
2668         return 0;
2669
2670 out_disable_vconn:
2671         tcpm_set_vconn(port, false);
2672 out_disable_pd:
2673         port->tcpc->set_pd_rx(port->tcpc, false);
2674 out_disable_mux:
2675         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2676                      TYPEC_ORIENTATION_NONE);
2677         return ret;
2678 }
2679
2680 static void tcpm_typec_disconnect(struct tcpm_port *port)
2681 {
2682         if (port->connected) {
2683                 typec_unregister_partner(port->partner);
2684                 port->partner = NULL;
2685                 port->connected = false;
2686         }
2687 }
2688
2689 static void tcpm_unregister_altmodes(struct tcpm_port *port)
2690 {
2691         struct pd_mode_data *modep = &port->mode_data;
2692         int i;
2693
2694         for (i = 0; i < modep->altmodes; i++) {
2695                 typec_unregister_altmode(port->partner_altmode[i]);
2696                 port->partner_altmode[i] = NULL;
2697         }
2698
2699         memset(modep, 0, sizeof(*modep));
2700 }
2701
2702 static void tcpm_reset_port(struct tcpm_port *port)
2703 {
2704         tcpm_unregister_altmodes(port);
2705         tcpm_typec_disconnect(port);
2706         port->attached = false;
2707         port->pd_capable = false;
2708         port->pps_data.supported = false;
2709
2710         /*
2711          * First Rx ID should be 0; set this to a sentinel of -1 so that
2712          * we can check tcpm_pd_rx_handler() if we had seen it before.
2713          */
2714         port->rx_msgid = -1;
2715
2716         port->tcpc->set_pd_rx(port->tcpc, false);
2717         tcpm_init_vbus(port);   /* also disables charging */
2718         tcpm_init_vconn(port);
2719         tcpm_set_current_limit(port, 0, 0);
2720         tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
2721         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2722                      TYPEC_ORIENTATION_NONE);
2723         tcpm_set_attached_state(port, false);
2724         port->try_src_count = 0;
2725         port->try_snk_count = 0;
2726         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
2727
2728         power_supply_changed(port->psy);
2729 }
2730
2731 static void tcpm_detach(struct tcpm_port *port)
2732 {
2733         if (!port->attached)
2734                 return;
2735
2736         if (tcpm_port_is_disconnected(port))
2737                 port->hard_reset_count = 0;
2738
2739         tcpm_reset_port(port);
2740 }
2741
2742 static void tcpm_src_detach(struct tcpm_port *port)
2743 {
2744         tcpm_detach(port);
2745 }
2746
2747 static int tcpm_snk_attach(struct tcpm_port *port)
2748 {
2749         int ret;
2750
2751         if (port->attached)
2752                 return 0;
2753
2754         ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2755                                 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2756         if (ret < 0)
2757                 return ret;
2758
2759         ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
2760         if (ret < 0)
2761                 return ret;
2762
2763         port->pd_capable = false;
2764
2765         port->partner = NULL;
2766
2767         port->attached = true;
2768         port->send_discover = true;
2769
2770         return 0;
2771 }
2772
2773 static void tcpm_snk_detach(struct tcpm_port *port)
2774 {
2775         tcpm_detach(port);
2776 }
2777
2778 static int tcpm_acc_attach(struct tcpm_port *port)
2779 {
2780         int ret;
2781
2782         if (port->attached)
2783                 return 0;
2784
2785         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2786         if (ret < 0)
2787                 return ret;
2788
2789         port->partner = NULL;
2790
2791         tcpm_typec_connect(port);
2792
2793         port->attached = true;
2794
2795         return 0;
2796 }
2797
2798 static void tcpm_acc_detach(struct tcpm_port *port)
2799 {
2800         tcpm_detach(port);
2801 }
2802
2803 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2804 {
2805         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2806                 return HARD_RESET_SEND;
2807         if (port->pd_capable)
2808                 return ERROR_RECOVERY;
2809         if (port->pwr_role == TYPEC_SOURCE)
2810                 return SRC_UNATTACHED;
2811         if (port->state == SNK_WAIT_CAPABILITIES)
2812                 return SNK_READY;
2813         return SNK_UNATTACHED;
2814 }
2815
2816 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
2817 {
2818         if (port->port_type == TYPEC_PORT_DRP) {
2819                 if (port->pwr_role == TYPEC_SOURCE)
2820                         return SRC_UNATTACHED;
2821                 else
2822                         return SNK_UNATTACHED;
2823         } else if (port->port_type == TYPEC_PORT_SRC) {
2824                 return SRC_UNATTACHED;
2825         }
2826
2827         return SNK_UNATTACHED;
2828 }
2829
2830 static void tcpm_check_send_discover(struct tcpm_port *port)
2831 {
2832         if (port->data_role == TYPEC_HOST && port->send_discover &&
2833             port->pd_capable) {
2834                 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
2835                 port->send_discover = false;
2836         }
2837 }
2838
2839 static void tcpm_swap_complete(struct tcpm_port *port, int result)
2840 {
2841         if (port->swap_pending) {
2842                 port->swap_status = result;
2843                 port->swap_pending = false;
2844                 port->non_pd_role_swap = false;
2845                 complete(&port->swap_complete);
2846         }
2847 }
2848
2849 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
2850 {
2851         switch (cc) {
2852         case TYPEC_CC_RP_1_5:
2853                 return TYPEC_PWR_MODE_1_5A;
2854         case TYPEC_CC_RP_3_0:
2855                 return TYPEC_PWR_MODE_3_0A;
2856         case TYPEC_CC_RP_DEF:
2857         default:
2858                 return TYPEC_PWR_MODE_USB;
2859         }
2860 }
2861
2862 static void run_state_machine(struct tcpm_port *port)
2863 {
2864         int ret;
2865         enum typec_pwr_opmode opmode;
2866         unsigned int msecs;
2867
2868         port->enter_state = port->state;
2869         switch (port->state) {
2870         case TOGGLING:
2871                 break;
2872         /* SRC states */
2873         case SRC_UNATTACHED:
2874                 if (!port->non_pd_role_swap)
2875                         tcpm_swap_complete(port, -ENOTCONN);
2876                 tcpm_src_detach(port);
2877                 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
2878                         tcpm_set_state(port, TOGGLING, 0);
2879                         break;
2880                 }
2881                 tcpm_set_cc(port, tcpm_rp_cc(port));
2882                 if (port->port_type == TYPEC_PORT_DRP)
2883                         tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
2884                 break;
2885         case SRC_ATTACH_WAIT:
2886                 if (tcpm_port_is_debug(port))
2887                         tcpm_set_state(port, DEBUG_ACC_ATTACHED,
2888                                        PD_T_CC_DEBOUNCE);
2889                 else if (tcpm_port_is_audio(port))
2890                         tcpm_set_state(port, AUDIO_ACC_ATTACHED,
2891                                        PD_T_CC_DEBOUNCE);
2892                 else if (tcpm_port_is_source(port))
2893                         tcpm_set_state(port,
2894                                        tcpm_try_snk(port) ? SNK_TRY
2895                                                           : SRC_ATTACHED,
2896                                        PD_T_CC_DEBOUNCE);
2897                 break;
2898
2899         case SNK_TRY:
2900                 port->try_snk_count++;
2901                 /*
2902                  * Requirements:
2903                  * - Do not drive vconn or vbus
2904                  * - Terminate CC pins (both) to Rd
2905                  * Action:
2906                  * - Wait for tDRPTry (PD_T_DRP_TRY).
2907                  *   Until then, ignore any state changes.
2908                  */
2909                 tcpm_set_cc(port, TYPEC_CC_RD);
2910                 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
2911                 break;
2912         case SNK_TRY_WAIT:
2913                 if (tcpm_port_is_sink(port)) {
2914                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
2915                 } else {
2916                         tcpm_set_state(port, SRC_TRYWAIT, 0);
2917                         port->max_wait = 0;
2918                 }
2919                 break;
2920         case SNK_TRY_WAIT_DEBOUNCE:
2921                 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
2922                                PD_T_PD_DEBOUNCE);
2923                 break;
2924         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
2925                 if (port->vbus_present && tcpm_port_is_sink(port)) {
2926                         tcpm_set_state(port, SNK_ATTACHED, 0);
2927                 } else {
2928                         tcpm_set_state(port, SRC_TRYWAIT, 0);
2929                         port->max_wait = 0;
2930                 }
2931                 break;
2932         case SRC_TRYWAIT:
2933                 tcpm_set_cc(port, tcpm_rp_cc(port));
2934                 if (port->max_wait == 0) {
2935                         port->max_wait = jiffies +
2936                                          msecs_to_jiffies(PD_T_DRP_TRY);
2937                         tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2938                                        PD_T_DRP_TRY);
2939                 } else {
2940                         if (time_is_after_jiffies(port->max_wait))
2941                                 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2942                                                jiffies_to_msecs(port->max_wait -
2943                                                                 jiffies));
2944                         else
2945                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
2946                 }
2947                 break;
2948         case SRC_TRYWAIT_DEBOUNCE:
2949                 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
2950                 break;
2951         case SRC_TRYWAIT_UNATTACHED:
2952                 tcpm_set_state(port, SNK_UNATTACHED, 0);
2953                 break;
2954
2955         case SRC_ATTACHED:
2956                 ret = tcpm_src_attach(port);
2957                 tcpm_set_state(port, SRC_UNATTACHED,
2958                                ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
2959                 break;
2960         case SRC_STARTUP:
2961                 opmode =  tcpm_get_pwr_opmode(tcpm_rp_cc(port));
2962                 typec_set_pwr_opmode(port->typec_port, opmode);
2963                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2964                 port->caps_count = 0;
2965                 port->negotiated_rev = PD_MAX_REV;
2966                 port->message_id = 0;
2967                 port->rx_msgid = -1;
2968                 port->explicit_contract = false;
2969                 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2970                 break;
2971         case SRC_SEND_CAPABILITIES:
2972                 port->caps_count++;
2973                 if (port->caps_count > PD_N_CAPS_COUNT) {
2974                         tcpm_set_state(port, SRC_READY, 0);
2975                         break;
2976                 }
2977                 ret = tcpm_pd_send_source_caps(port);
2978                 if (ret < 0) {
2979                         tcpm_set_state(port, SRC_SEND_CAPABILITIES,
2980                                        PD_T_SEND_SOURCE_CAP);
2981                 } else {
2982                         /*
2983                          * Per standard, we should clear the reset counter here.
2984                          * However, that can result in state machine hang-ups.
2985                          * Reset it only in READY state to improve stability.
2986                          */
2987                         /* port->hard_reset_count = 0; */
2988                         port->caps_count = 0;
2989                         port->pd_capable = true;
2990                         tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
2991                                             PD_T_SEND_SOURCE_CAP);
2992                 }
2993                 break;
2994         case SRC_SEND_CAPABILITIES_TIMEOUT:
2995                 /*
2996                  * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
2997                  *
2998                  * PD 2.0 sinks are supposed to accept src-capabilities with a
2999                  * 3.0 header and simply ignore any src PDOs which the sink does
3000                  * not understand such as PPS but some 2.0 sinks instead ignore
3001                  * the entire PD_DATA_SOURCE_CAP message, causing contract
3002                  * negotiation to fail.
3003                  *
3004                  * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
3005                  * sending src-capabilities with a lower PD revision to
3006                  * make these broken sinks work.
3007                  */
3008                 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
3009                         tcpm_set_state(port, HARD_RESET_SEND, 0);
3010                 } else if (port->negotiated_rev > PD_REV20) {
3011                         port->negotiated_rev--;
3012                         port->hard_reset_count = 0;
3013                         tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3014                 } else {
3015                         tcpm_set_state(port, hard_reset_state(port), 0);
3016                 }
3017                 break;
3018         case SRC_NEGOTIATE_CAPABILITIES:
3019                 ret = tcpm_pd_check_request(port);
3020                 if (ret < 0) {
3021                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
3022                         if (!port->explicit_contract) {
3023                                 tcpm_set_state(port,
3024                                                SRC_WAIT_NEW_CAPABILITIES, 0);
3025                         } else {
3026                                 tcpm_set_state(port, SRC_READY, 0);
3027                         }
3028                 } else {
3029                         tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3030                         tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
3031                                        PD_T_SRC_TRANSITION);
3032                 }
3033                 break;
3034         case SRC_TRANSITION_SUPPLY:
3035                 /* XXX: regulator_set_voltage(vbus, ...) */
3036                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3037                 port->explicit_contract = true;
3038                 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
3039                 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3040                 tcpm_set_state_cond(port, SRC_READY, 0);
3041                 break;
3042         case SRC_READY:
3043 #if 1
3044                 port->hard_reset_count = 0;
3045 #endif
3046                 port->try_src_count = 0;
3047
3048                 tcpm_swap_complete(port, 0);
3049                 tcpm_typec_connect(port);
3050
3051                 tcpm_check_send_discover(port);
3052                 /*
3053                  * 6.3.5
3054                  * Sending ping messages is not necessary if
3055                  * - the source operates at vSafe5V
3056                  * or
3057                  * - The system is not operating in PD mode
3058                  * or
3059                  * - Both partners are connected using a Type-C connector
3060                  *
3061                  * There is no actual need to send PD messages since the local
3062                  * port type-c and the spec does not clearly say whether PD is
3063                  * possible when type-c is connected to Type-A/B
3064                  */
3065                 break;
3066         case SRC_WAIT_NEW_CAPABILITIES:
3067                 /* Nothing to do... */
3068                 break;
3069
3070         /* SNK states */
3071         case SNK_UNATTACHED:
3072                 if (!port->non_pd_role_swap)
3073                         tcpm_swap_complete(port, -ENOTCONN);
3074                 tcpm_pps_complete(port, -ENOTCONN);
3075                 tcpm_snk_detach(port);
3076                 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
3077                         tcpm_set_state(port, TOGGLING, 0);
3078                         break;
3079                 }
3080                 tcpm_set_cc(port, TYPEC_CC_RD);
3081                 if (port->port_type == TYPEC_PORT_DRP)
3082                         tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
3083                 break;
3084         case SNK_ATTACH_WAIT:
3085                 if ((port->cc1 == TYPEC_CC_OPEN &&
3086                      port->cc2 != TYPEC_CC_OPEN) ||
3087                     (port->cc1 != TYPEC_CC_OPEN &&
3088                      port->cc2 == TYPEC_CC_OPEN))
3089                         tcpm_set_state(port, SNK_DEBOUNCED,
3090                                        PD_T_CC_DEBOUNCE);
3091                 else if (tcpm_port_is_disconnected(port))
3092                         tcpm_set_state(port, SNK_UNATTACHED,
3093                                        PD_T_PD_DEBOUNCE);
3094                 break;
3095         case SNK_DEBOUNCED:
3096                 if (tcpm_port_is_disconnected(port))
3097                         tcpm_set_state(port, SNK_UNATTACHED,
3098                                        PD_T_PD_DEBOUNCE);
3099                 else if (port->vbus_present)
3100                         tcpm_set_state(port,
3101                                        tcpm_try_src(port) ? SRC_TRY
3102                                                           : SNK_ATTACHED,
3103                                        0);
3104                 else
3105                         /* Wait for VBUS, but not forever */
3106                         tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
3107                 break;
3108
3109         case SRC_TRY:
3110                 port->try_src_count++;
3111                 tcpm_set_cc(port, tcpm_rp_cc(port));
3112                 port->max_wait = 0;
3113                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3114                 break;
3115         case SRC_TRY_WAIT:
3116                 if (port->max_wait == 0) {
3117                         port->max_wait = jiffies +
3118                                          msecs_to_jiffies(PD_T_DRP_TRY);
3119                         msecs = PD_T_DRP_TRY;
3120                 } else {
3121                         if (time_is_after_jiffies(port->max_wait))
3122                                 msecs = jiffies_to_msecs(port->max_wait -
3123                                                          jiffies);
3124                         else
3125                                 msecs = 0;
3126                 }
3127                 tcpm_set_state(port, SNK_TRYWAIT, msecs);
3128                 break;
3129         case SRC_TRY_DEBOUNCE:
3130                 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
3131                 break;
3132         case SNK_TRYWAIT:
3133                 tcpm_set_cc(port, TYPEC_CC_RD);
3134                 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
3135                 break;
3136         case SNK_TRYWAIT_VBUS:
3137                 /*
3138                  * TCPM stays in this state indefinitely until VBUS
3139                  * is detected as long as Rp is not detected for
3140                  * more than a time period of tPDDebounce.
3141                  */
3142                 if (port->vbus_present && tcpm_port_is_sink(port)) {
3143                         tcpm_set_state(port, SNK_ATTACHED, 0);
3144                         break;
3145                 }
3146                 if (!tcpm_port_is_sink(port))
3147                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3148                 break;
3149         case SNK_TRYWAIT_DEBOUNCE:
3150                 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
3151                 break;
3152         case SNK_ATTACHED:
3153                 ret = tcpm_snk_attach(port);
3154                 if (ret < 0)
3155                         tcpm_set_state(port, SNK_UNATTACHED, 0);
3156                 else
3157                         tcpm_set_state(port, SNK_STARTUP, 0);
3158                 break;
3159         case SNK_STARTUP:
3160                 opmode =  tcpm_get_pwr_opmode(port->polarity ?
3161                                               port->cc2 : port->cc1);
3162                 typec_set_pwr_opmode(port->typec_port, opmode);
3163                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
3164                 port->negotiated_rev = PD_MAX_REV;
3165                 port->message_id = 0;
3166                 port->rx_msgid = -1;
3167                 port->explicit_contract = false;
3168                 tcpm_set_state(port, SNK_DISCOVERY, 0);
3169                 break;
3170         case SNK_DISCOVERY:
3171                 if (port->vbus_present) {
3172                         tcpm_set_current_limit(port,
3173                                                tcpm_get_current_limit(port),
3174                                                5000);
3175                         tcpm_set_charge(port, true);
3176                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3177                         break;
3178                 }
3179                 /*
3180                  * For DRP, timeouts differ. Also, handling is supposed to be
3181                  * different and much more complex (dead battery detection;
3182                  * see USB power delivery specification, section 8.3.3.6.1.5.1).
3183                  */
3184                 tcpm_set_state(port, hard_reset_state(port),
3185                                port->port_type == TYPEC_PORT_DRP ?
3186                                         PD_T_DB_DETECT : PD_T_NO_RESPONSE);
3187                 break;
3188         case SNK_DISCOVERY_DEBOUNCE:
3189                 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
3190                                PD_T_CC_DEBOUNCE);
3191                 break;
3192         case SNK_DISCOVERY_DEBOUNCE_DONE:
3193                 if (!tcpm_port_is_disconnected(port) &&
3194                     tcpm_port_is_sink(port) &&
3195                     time_is_after_jiffies(port->delayed_runtime)) {
3196                         tcpm_set_state(port, SNK_DISCOVERY,
3197                                        jiffies_to_msecs(port->delayed_runtime -
3198                                                         jiffies));
3199                         break;
3200                 }
3201                 tcpm_set_state(port, unattached_state(port), 0);
3202                 break;
3203         case SNK_WAIT_CAPABILITIES:
3204                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3205                 if (ret < 0) {
3206                         tcpm_set_state(port, SNK_READY, 0);
3207                         break;
3208                 }
3209                 /*
3210                  * If VBUS has never been low, and we time out waiting
3211                  * for source cap, try a soft reset first, in case we
3212                  * were already in a stable contract before this boot.
3213                  * Do this only once.
3214                  */
3215                 if (port->vbus_never_low) {
3216                         port->vbus_never_low = false;
3217                         tcpm_set_state(port, SOFT_RESET_SEND,
3218                                        PD_T_SINK_WAIT_CAP);
3219                 } else {
3220                         tcpm_set_state(port, hard_reset_state(port),
3221                                        PD_T_SINK_WAIT_CAP);
3222                 }
3223                 break;
3224         case SNK_NEGOTIATE_CAPABILITIES:
3225                 port->pd_capable = true;
3226                 port->hard_reset_count = 0;
3227                 ret = tcpm_pd_send_request(port);
3228                 if (ret < 0) {
3229                         /* Let the Source send capabilities again. */
3230                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3231                 } else {
3232                         tcpm_set_state_cond(port, hard_reset_state(port),
3233                                             PD_T_SENDER_RESPONSE);
3234                 }
3235                 break;
3236         case SNK_NEGOTIATE_PPS_CAPABILITIES:
3237                 ret = tcpm_pd_send_pps_request(port);
3238                 if (ret < 0) {
3239                         port->pps_status = ret;
3240                         /*
3241                          * If this was called due to updates to sink
3242                          * capabilities, and pps is no longer valid, we should
3243                          * safely fall back to a standard PDO.
3244                          */
3245                         if (port->update_sink_caps)
3246                                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3247                         else
3248                                 tcpm_set_state(port, SNK_READY, 0);
3249                 } else {
3250                         tcpm_set_state_cond(port, hard_reset_state(port),
3251                                             PD_T_SENDER_RESPONSE);
3252                 }
3253                 break;
3254         case SNK_TRANSITION_SINK:
3255         case SNK_TRANSITION_SINK_VBUS:
3256                 tcpm_set_state(port, hard_reset_state(port),
3257                                PD_T_PS_TRANSITION);
3258                 break;
3259         case SNK_READY:
3260                 port->try_snk_count = 0;
3261                 port->update_sink_caps = false;
3262                 if (port->explicit_contract) {
3263                         typec_set_pwr_opmode(port->typec_port,
3264                                              TYPEC_PWR_MODE_PD);
3265                         port->pwr_opmode = TYPEC_PWR_MODE_PD;
3266                 }
3267
3268                 tcpm_swap_complete(port, 0);
3269                 tcpm_typec_connect(port);
3270                 tcpm_check_send_discover(port);
3271                 tcpm_pps_complete(port, port->pps_status);
3272
3273                 power_supply_changed(port->psy);
3274
3275                 break;
3276
3277         /* Accessory states */
3278         case ACC_UNATTACHED:
3279                 tcpm_acc_detach(port);
3280                 tcpm_set_state(port, SRC_UNATTACHED, 0);
3281                 break;
3282         case DEBUG_ACC_ATTACHED:
3283         case AUDIO_ACC_ATTACHED:
3284                 ret = tcpm_acc_attach(port);
3285                 if (ret < 0)
3286                         tcpm_set_state(port, ACC_UNATTACHED, 0);
3287                 break;
3288         case AUDIO_ACC_DEBOUNCE:
3289                 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
3290                 break;
3291
3292         /* Hard_Reset states */
3293         case HARD_RESET_SEND:
3294                 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
3295                 tcpm_set_state(port, HARD_RESET_START, 0);
3296                 break;
3297         case HARD_RESET_START:
3298                 port->hard_reset_count++;
3299                 port->tcpc->set_pd_rx(port->tcpc, false);
3300                 tcpm_unregister_altmodes(port);
3301                 port->send_discover = true;
3302                 if (port->pwr_role == TYPEC_SOURCE)
3303                         tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
3304                                        PD_T_PS_HARD_RESET);
3305                 else
3306                         tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
3307                 break;
3308         case SRC_HARD_RESET_VBUS_OFF:
3309                 tcpm_set_vconn(port, true);
3310                 tcpm_set_vbus(port, false);
3311                 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
3312                                TYPEC_HOST);
3313                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
3314                 break;
3315         case SRC_HARD_RESET_VBUS_ON:
3316                 tcpm_set_vbus(port, true);
3317                 port->tcpc->set_pd_rx(port->tcpc, true);
3318                 tcpm_set_attached_state(port, true);
3319                 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
3320                 break;
3321         case SNK_HARD_RESET_SINK_OFF:
3322                 memset(&port->pps_data, 0, sizeof(port->pps_data));
3323                 tcpm_set_vconn(port, false);
3324                 if (port->pd_capable)
3325                         tcpm_set_charge(port, false);
3326                 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
3327                                TYPEC_DEVICE);
3328                 /*
3329                  * VBUS may or may not toggle, depending on the adapter.
3330                  * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
3331                  * directly after timeout.
3332                  */
3333                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
3334                 break;
3335         case SNK_HARD_RESET_WAIT_VBUS:
3336                 /* Assume we're disconnected if VBUS doesn't come back. */
3337                 tcpm_set_state(port, SNK_UNATTACHED,
3338                                PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
3339                 break;
3340         case SNK_HARD_RESET_SINK_ON:
3341                 /* Note: There is no guarantee that VBUS is on in this state */
3342                 /*
3343                  * XXX:
3344                  * The specification suggests that dual mode ports in sink
3345                  * mode should transition to state PE_SRC_Transition_to_default.
3346                  * See USB power delivery specification chapter 8.3.3.6.1.3.
3347                  * This would mean to to
3348                  * - turn off VCONN, reset power supply
3349                  * - request hardware reset
3350                  * - turn on VCONN
3351                  * - Transition to state PE_Src_Startup
3352                  * SNK only ports shall transition to state Snk_Startup
3353                  * (see chapter 8.3.3.3.8).
3354                  * Similar, dual-mode ports in source mode should transition
3355                  * to PE_SNK_Transition_to_default.
3356                  */
3357                 if (port->pd_capable) {
3358                         tcpm_set_current_limit(port,
3359                                                tcpm_get_current_limit(port),
3360                                                5000);
3361                         tcpm_set_charge(port, true);
3362                 }
3363                 tcpm_set_attached_state(port, true);
3364                 tcpm_set_state(port, SNK_STARTUP, 0);
3365                 break;
3366
3367         /* Soft_Reset states */
3368         case SOFT_RESET:
3369                 port->message_id = 0;
3370                 port->rx_msgid = -1;
3371                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3372                 if (port->pwr_role == TYPEC_SOURCE)
3373                         tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3374                 else
3375                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3376                 break;
3377         case SOFT_RESET_SEND:
3378                 port->message_id = 0;
3379                 port->rx_msgid = -1;
3380                 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
3381                         tcpm_set_state_cond(port, hard_reset_state(port), 0);
3382                 else
3383                         tcpm_set_state_cond(port, hard_reset_state(port),
3384                                             PD_T_SENDER_RESPONSE);
3385                 break;
3386
3387         /* DR_Swap states */
3388         case DR_SWAP_SEND:
3389                 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
3390                 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
3391                                     PD_T_SENDER_RESPONSE);
3392                 break;
3393         case DR_SWAP_ACCEPT:
3394                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3395                 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
3396                 break;
3397         case DR_SWAP_SEND_TIMEOUT:
3398                 tcpm_swap_complete(port, -ETIMEDOUT);
3399                 tcpm_set_state(port, ready_state(port), 0);
3400                 break;
3401         case DR_SWAP_CHANGE_DR:
3402                 if (port->data_role == TYPEC_HOST) {
3403                         tcpm_unregister_altmodes(port);
3404                         tcpm_set_roles(port, true, port->pwr_role,
3405                                        TYPEC_DEVICE);
3406                 } else {
3407                         tcpm_set_roles(port, true, port->pwr_role,
3408                                        TYPEC_HOST);
3409                         port->send_discover = true;
3410                 }
3411                 tcpm_set_state(port, ready_state(port), 0);
3412                 break;
3413
3414         /* PR_Swap states */
3415         case PR_SWAP_ACCEPT:
3416                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3417                 tcpm_set_state(port, PR_SWAP_START, 0);
3418                 break;
3419         case PR_SWAP_SEND:
3420                 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
3421                 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
3422                                     PD_T_SENDER_RESPONSE);
3423                 break;
3424         case PR_SWAP_SEND_TIMEOUT:
3425                 tcpm_swap_complete(port, -ETIMEDOUT);
3426                 tcpm_set_state(port, ready_state(port), 0);
3427                 break;
3428         case PR_SWAP_START:
3429                 if (port->pwr_role == TYPEC_SOURCE)
3430                         tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
3431                                        PD_T_SRC_TRANSITION);
3432                 else
3433                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
3434                 break;
3435         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3436                 tcpm_set_vbus(port, false);
3437                 port->explicit_contract = false;
3438                 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
3439                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
3440                                PD_T_SRCSWAPSTDBY);
3441                 break;
3442         case PR_SWAP_SRC_SNK_SOURCE_OFF:
3443                 tcpm_set_cc(port, TYPEC_CC_RD);
3444                 /* allow CC debounce */
3445                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
3446                                PD_T_CC_DEBOUNCE);
3447                 break;
3448         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3449                 /*
3450                  * USB-PD standard, 6.2.1.4, Port Power Role:
3451                  * "During the Power Role Swap Sequence, for the initial Source
3452                  * Port, the Port Power Role field shall be set to Sink in the
3453                  * PS_RDY Message indicating that the initial Source’s power
3454                  * supply is turned off"
3455                  */
3456                 tcpm_set_pwr_role(port, TYPEC_SINK);
3457                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
3458                         tcpm_set_state(port, ERROR_RECOVERY, 0);
3459                         break;
3460                 }
3461                 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
3462                 break;
3463         case PR_SWAP_SRC_SNK_SINK_ON:
3464                 tcpm_set_state(port, SNK_STARTUP, 0);
3465                 break;
3466         case PR_SWAP_SNK_SRC_SINK_OFF:
3467                 tcpm_set_charge(port, false);
3468                 tcpm_set_state(port, hard_reset_state(port),
3469                                PD_T_PS_SOURCE_OFF);
3470                 break;
3471         case PR_SWAP_SNK_SRC_SOURCE_ON:
3472                 tcpm_set_cc(port, tcpm_rp_cc(port));
3473                 tcpm_set_vbus(port, true);
3474                 /*
3475                  * allow time VBUS ramp-up, must be < tNewSrc
3476                  * Also, this window overlaps with CC debounce as well.
3477                  * So, Wait for the max of two which is PD_T_NEWSRC
3478                  */
3479                 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
3480                                PD_T_NEWSRC);
3481                 break;
3482         case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
3483                 /*
3484                  * USB PD standard, 6.2.1.4:
3485                  * "Subsequent Messages initiated by the Policy Engine,
3486                  * such as the PS_RDY Message sent to indicate that Vbus
3487                  * is ready, will have the Port Power Role field set to
3488                  * Source."
3489                  */
3490                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
3491                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3492                 tcpm_set_state(port, SRC_STARTUP, 0);
3493                 break;
3494
3495         case VCONN_SWAP_ACCEPT:
3496                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3497                 tcpm_set_state(port, VCONN_SWAP_START, 0);
3498                 break;
3499         case VCONN_SWAP_SEND:
3500                 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
3501                 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
3502                                PD_T_SENDER_RESPONSE);
3503                 break;
3504         case VCONN_SWAP_SEND_TIMEOUT:
3505                 tcpm_swap_complete(port, -ETIMEDOUT);
3506                 tcpm_set_state(port, ready_state(port), 0);
3507                 break;
3508         case VCONN_SWAP_START:
3509                 if (port->vconn_role == TYPEC_SOURCE)
3510                         tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
3511                 else
3512                         tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
3513                 break;
3514         case VCONN_SWAP_WAIT_FOR_VCONN:
3515                 tcpm_set_state(port, hard_reset_state(port),
3516                                PD_T_VCONN_SOURCE_ON);
3517                 break;
3518         case VCONN_SWAP_TURN_ON_VCONN:
3519                 tcpm_set_vconn(port, true);
3520                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3521                 tcpm_set_state(port, ready_state(port), 0);
3522                 break;
3523         case VCONN_SWAP_TURN_OFF_VCONN:
3524                 tcpm_set_vconn(port, false);
3525                 tcpm_set_state(port, ready_state(port), 0);
3526                 break;
3527
3528         case DR_SWAP_CANCEL:
3529         case PR_SWAP_CANCEL:
3530         case VCONN_SWAP_CANCEL:
3531                 tcpm_swap_complete(port, port->swap_status);
3532                 if (port->pwr_role == TYPEC_SOURCE)
3533                         tcpm_set_state(port, SRC_READY, 0);
3534                 else
3535                         tcpm_set_state(port, SNK_READY, 0);
3536                 break;
3537
3538         case BIST_RX:
3539                 switch (BDO_MODE_MASK(port->bist_request)) {
3540                 case BDO_MODE_CARRIER2:
3541                         tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
3542                         break;
3543                 default:
3544                         break;
3545                 }
3546                 /* Always switch to unattached state */
3547                 tcpm_set_state(port, unattached_state(port), 0);
3548                 break;
3549         case GET_STATUS_SEND:
3550                 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
3551                 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
3552                                PD_T_SENDER_RESPONSE);
3553                 break;
3554         case GET_STATUS_SEND_TIMEOUT:
3555                 tcpm_set_state(port, ready_state(port), 0);
3556                 break;
3557         case GET_PPS_STATUS_SEND:
3558                 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
3559                 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
3560                                PD_T_SENDER_RESPONSE);
3561                 break;
3562         case GET_PPS_STATUS_SEND_TIMEOUT:
3563                 tcpm_set_state(port, ready_state(port), 0);
3564                 break;
3565         case ERROR_RECOVERY:
3566                 tcpm_swap_complete(port, -EPROTO);
3567                 tcpm_pps_complete(port, -EPROTO);
3568                 tcpm_set_state(port, PORT_RESET, 0);
3569                 break;
3570         case PORT_RESET:
3571                 tcpm_reset_port(port);
3572                 tcpm_set_cc(port, TYPEC_CC_OPEN);
3573                 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
3574                                PD_T_ERROR_RECOVERY);
3575                 break;
3576         case PORT_RESET_WAIT_OFF:
3577                 tcpm_set_state(port,
3578                                tcpm_default_state(port),
3579                                port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
3580                 break;
3581         default:
3582                 WARN(1, "Unexpected port state %d\n", port->state);
3583                 break;
3584         }
3585 }
3586
3587 static void tcpm_state_machine_work(struct work_struct *work)
3588 {
3589         struct tcpm_port *port = container_of(work, struct tcpm_port,
3590                                               state_machine.work);
3591         enum tcpm_state prev_state;
3592
3593         mutex_lock(&port->lock);
3594         port->state_machine_running = true;
3595
3596         if (port->queued_message && tcpm_send_queued_message(port))
3597                 goto done;
3598
3599         /* If we were queued due to a delayed state change, update it now */
3600         if (port->delayed_state) {
3601                 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
3602                          tcpm_states[port->state],
3603                          tcpm_states[port->delayed_state], port->delay_ms);
3604                 port->prev_state = port->state;
3605                 port->state = port->delayed_state;
3606                 port->delayed_state = INVALID_STATE;
3607         }
3608
3609         /*
3610          * Continue running as long as we have (non-delayed) state changes
3611          * to make.
3612          */
3613         do {
3614                 prev_state = port->state;
3615                 run_state_machine(port);
3616                 if (port->queued_message)
3617                         tcpm_send_queued_message(port);
3618         } while (port->state != prev_state && !port->delayed_state);
3619
3620 done:
3621         port->state_machine_running = false;
3622         mutex_unlock(&port->lock);
3623 }
3624
3625 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
3626                             enum typec_cc_status cc2)
3627 {
3628         enum typec_cc_status old_cc1, old_cc2;
3629         enum tcpm_state new_state;
3630
3631         old_cc1 = port->cc1;
3632         old_cc2 = port->cc2;
3633         port->cc1 = cc1;
3634         port->cc2 = cc2;
3635
3636         tcpm_log_force(port,
3637                        "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
3638                        old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
3639                        port->polarity,
3640                        tcpm_port_is_disconnected(port) ? "disconnected"
3641                                                        : "connected");
3642
3643         switch (port->state) {
3644         case TOGGLING:
3645                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3646                     tcpm_port_is_source(port))
3647                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3648                 else if (tcpm_port_is_sink(port))
3649                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3650                 break;
3651         case SRC_UNATTACHED:
3652         case ACC_UNATTACHED:
3653                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3654                     tcpm_port_is_source(port))
3655                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3656                 break;
3657         case SRC_ATTACH_WAIT:
3658                 if (tcpm_port_is_disconnected(port) ||
3659                     tcpm_port_is_audio_detached(port))
3660                         tcpm_set_state(port, SRC_UNATTACHED, 0);
3661                 else if (cc1 != old_cc1 || cc2 != old_cc2)
3662                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3663                 break;
3664         case SRC_ATTACHED:
3665         case SRC_SEND_CAPABILITIES:
3666         case SRC_READY:
3667                 if (tcpm_port_is_disconnected(port) ||
3668                     !tcpm_port_is_source(port))
3669                         tcpm_set_state(port, SRC_UNATTACHED, 0);
3670                 break;
3671         case SNK_UNATTACHED:
3672                 if (tcpm_port_is_sink(port))
3673                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3674                 break;
3675         case SNK_ATTACH_WAIT:
3676                 if ((port->cc1 == TYPEC_CC_OPEN &&
3677                      port->cc2 != TYPEC_CC_OPEN) ||
3678                     (port->cc1 != TYPEC_CC_OPEN &&
3679                      port->cc2 == TYPEC_CC_OPEN))
3680                         new_state = SNK_DEBOUNCED;
3681                 else if (tcpm_port_is_disconnected(port))
3682                         new_state = SNK_UNATTACHED;
3683                 else
3684                         break;
3685                 if (new_state != port->delayed_state)
3686                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3687                 break;
3688         case SNK_DEBOUNCED:
3689                 if (tcpm_port_is_disconnected(port))
3690                         new_state = SNK_UNATTACHED;
3691                 else if (port->vbus_present)
3692                         new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
3693                 else
3694                         new_state = SNK_UNATTACHED;
3695                 if (new_state != port->delayed_state)
3696                         tcpm_set_state(port, SNK_DEBOUNCED, 0);
3697                 break;
3698         case SNK_READY:
3699                 if (tcpm_port_is_disconnected(port))
3700                         tcpm_set_state(port, unattached_state(port), 0);
3701                 else if (!port->pd_capable &&
3702                          (cc1 != old_cc1 || cc2 != old_cc2))
3703                         tcpm_set_current_limit(port,
3704                                                tcpm_get_current_limit(port),
3705                                                5000);
3706                 break;
3707
3708         case AUDIO_ACC_ATTACHED:
3709                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3710                         tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
3711                 break;
3712         case AUDIO_ACC_DEBOUNCE:
3713                 if (tcpm_port_is_audio(port))
3714                         tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
3715                 break;
3716
3717         case DEBUG_ACC_ATTACHED:
3718                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3719                         tcpm_set_state(port, ACC_UNATTACHED, 0);
3720                 break;
3721
3722         case SNK_TRY:
3723                 /* Do nothing, waiting for timeout */
3724                 break;
3725
3726         case SNK_DISCOVERY:
3727                 /* CC line is unstable, wait for debounce */
3728                 if (tcpm_port_is_disconnected(port))
3729                         tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
3730                 break;
3731         case SNK_DISCOVERY_DEBOUNCE:
3732                 break;
3733
3734         case SRC_TRYWAIT:
3735                 /* Hand over to state machine if needed */
3736                 if (!port->vbus_present && tcpm_port_is_source(port))
3737                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3738                 break;
3739         case SRC_TRYWAIT_DEBOUNCE:
3740                 if (port->vbus_present || !tcpm_port_is_source(port))
3741                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3742                 break;
3743         case SNK_TRY_WAIT_DEBOUNCE:
3744                 if (!tcpm_port_is_sink(port)) {
3745                         port->max_wait = 0;
3746                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3747                 }
3748                 break;
3749         case SRC_TRY_WAIT:
3750                 if (tcpm_port_is_source(port))
3751                         tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
3752                 break;
3753         case SRC_TRY_DEBOUNCE:
3754                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3755                 break;
3756         case SNK_TRYWAIT_DEBOUNCE:
3757                 if (tcpm_port_is_sink(port))
3758                         tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
3759                 break;
3760         case SNK_TRYWAIT_VBUS:
3761                 if (!tcpm_port_is_sink(port))
3762                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3763                 break;
3764         case SNK_TRYWAIT:
3765                 /* Do nothing, waiting for tCCDebounce */
3766                 break;
3767         case PR_SWAP_SNK_SRC_SINK_OFF:
3768         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3769         case PR_SWAP_SRC_SNK_SOURCE_OFF:
3770         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3771         case PR_SWAP_SNK_SRC_SOURCE_ON:
3772                 /*
3773                  * CC state change is expected in PR_SWAP
3774                  * Ignore it.
3775                  */
3776                 break;
3777
3778         default:
3779                 if (tcpm_port_is_disconnected(port))
3780                         tcpm_set_state(port, unattached_state(port), 0);
3781                 break;
3782         }
3783 }
3784
3785 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
3786 {
3787         tcpm_log_force(port, "VBUS on");
3788         port->vbus_present = true;
3789         switch (port->state) {
3790         case SNK_TRANSITION_SINK_VBUS:
3791                 port->explicit_contract = true;
3792                 tcpm_set_state(port, SNK_READY, 0);
3793                 break;
3794         case SNK_DISCOVERY:
3795                 tcpm_set_state(port, SNK_DISCOVERY, 0);
3796                 break;
3797
3798         case SNK_DEBOUNCED:
3799                 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
3800                                                         : SNK_ATTACHED,
3801                                        0);
3802                 break;
3803         case SNK_HARD_RESET_WAIT_VBUS:
3804                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
3805                 break;
3806         case SRC_ATTACHED:
3807                 tcpm_set_state(port, SRC_STARTUP, 0);
3808                 break;
3809         case SRC_HARD_RESET_VBUS_ON:
3810                 tcpm_set_state(port, SRC_STARTUP, 0);
3811                 break;
3812
3813         case SNK_TRY:
3814                 /* Do nothing, waiting for timeout */
3815                 break;
3816         case SRC_TRYWAIT:
3817                 /* Do nothing, Waiting for Rd to be detected */
3818                 break;
3819         case SRC_TRYWAIT_DEBOUNCE:
3820                 tcpm_set_state(port, SRC_TRYWAIT, 0);
3821                 break;
3822         case SNK_TRY_WAIT_DEBOUNCE:
3823                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3824                 break;
3825         case SNK_TRYWAIT:
3826                 /* Do nothing, waiting for tCCDebounce */
3827                 break;
3828         case SNK_TRYWAIT_VBUS:
3829                 if (tcpm_port_is_sink(port))
3830                         tcpm_set_state(port, SNK_ATTACHED, 0);
3831                 break;
3832         case SNK_TRYWAIT_DEBOUNCE:
3833                 /* Do nothing, waiting for Rp */
3834                 break;
3835         case SRC_TRY_WAIT:
3836         case SRC_TRY_DEBOUNCE:
3837                 /* Do nothing, waiting for sink detection */
3838                 break;
3839         default:
3840                 break;
3841         }
3842 }
3843
3844 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
3845 {
3846         tcpm_log_force(port, "VBUS off");
3847         port->vbus_present = false;
3848         port->vbus_never_low = false;
3849         switch (port->state) {
3850         case SNK_HARD_RESET_SINK_OFF:
3851                 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
3852                 break;
3853         case SRC_HARD_RESET_VBUS_OFF:
3854                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
3855                 break;
3856         case HARD_RESET_SEND:
3857                 break;
3858
3859         case SNK_TRY:
3860                 /* Do nothing, waiting for timeout */
3861                 break;
3862         case SRC_TRYWAIT:
3863                 /* Hand over to state machine if needed */
3864                 if (tcpm_port_is_source(port))
3865                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3866                 break;
3867         case SNK_TRY_WAIT_DEBOUNCE:
3868                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3869                 break;
3870         case SNK_TRYWAIT:
3871         case SNK_TRYWAIT_VBUS:
3872         case SNK_TRYWAIT_DEBOUNCE:
3873                 break;
3874         case SNK_ATTACH_WAIT:
3875                 tcpm_set_state(port, SNK_UNATTACHED, 0);
3876                 break;
3877
3878         case SNK_NEGOTIATE_CAPABILITIES:
3879                 break;
3880
3881         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3882                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
3883                 break;
3884
3885         case PR_SWAP_SNK_SRC_SINK_OFF:
3886                 /* Do nothing, expected */
3887                 break;
3888
3889         case PORT_RESET_WAIT_OFF:
3890                 tcpm_set_state(port, tcpm_default_state(port), 0);
3891                 break;
3892         case SRC_TRY_WAIT:
3893         case SRC_TRY_DEBOUNCE:
3894                 /* Do nothing, waiting for sink detection */
3895                 break;
3896         default:
3897                 if (port->pwr_role == TYPEC_SINK &&
3898                     port->attached)
3899                         tcpm_set_state(port, SNK_UNATTACHED, 0);
3900                 break;
3901         }
3902 }
3903
3904 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
3905 {
3906         tcpm_log_force(port, "Received hard reset");
3907         /*
3908          * If we keep receiving hard reset requests, executing the hard reset
3909          * must have failed. Revert to error recovery if that happens.
3910          */
3911         tcpm_set_state(port,
3912                        port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
3913                                 HARD_RESET_START : ERROR_RECOVERY,
3914                        0);
3915 }
3916
3917 static void tcpm_pd_event_handler(struct work_struct *work)
3918 {
3919         struct tcpm_port *port = container_of(work, struct tcpm_port,
3920                                               event_work);
3921         u32 events;
3922
3923         mutex_lock(&port->lock);
3924
3925         spin_lock(&port->pd_event_lock);
3926         while (port->pd_events) {
3927                 events = port->pd_events;
3928                 port->pd_events = 0;
3929                 spin_unlock(&port->pd_event_lock);
3930                 if (events & TCPM_RESET_EVENT)
3931                         _tcpm_pd_hard_reset(port);
3932                 if (events & TCPM_VBUS_EVENT) {
3933                         bool vbus;
3934
3935                         vbus = port->tcpc->get_vbus(port->tcpc);
3936                         if (vbus)
3937                                 _tcpm_pd_vbus_on(port);
3938                         else
3939                                 _tcpm_pd_vbus_off(port);
3940                 }
3941                 if (events & TCPM_CC_EVENT) {
3942                         enum typec_cc_status cc1, cc2;
3943
3944                         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3945                                 _tcpm_cc_change(port, cc1, cc2);
3946                 }
3947                 spin_lock(&port->pd_event_lock);
3948         }
3949         spin_unlock(&port->pd_event_lock);
3950         mutex_unlock(&port->lock);
3951 }
3952
3953 void tcpm_cc_change(struct tcpm_port *port)
3954 {
3955         spin_lock(&port->pd_event_lock);
3956         port->pd_events |= TCPM_CC_EVENT;
3957         spin_unlock(&port->pd_event_lock);
3958         queue_work(port->wq, &port->event_work);
3959 }
3960 EXPORT_SYMBOL_GPL(tcpm_cc_change);
3961
3962 void tcpm_vbus_change(struct tcpm_port *port)
3963 {
3964         spin_lock(&port->pd_event_lock);
3965         port->pd_events |= TCPM_VBUS_EVENT;
3966         spin_unlock(&port->pd_event_lock);
3967         queue_work(port->wq, &port->event_work);
3968 }
3969 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
3970
3971 void tcpm_pd_hard_reset(struct tcpm_port *port)
3972 {
3973         spin_lock(&port->pd_event_lock);
3974         port->pd_events = TCPM_RESET_EVENT;
3975         spin_unlock(&port->pd_event_lock);
3976         queue_work(port->wq, &port->event_work);
3977 }
3978 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
3979
3980 static int tcpm_dr_set(const struct typec_capability *cap,
3981                        enum typec_data_role data)
3982 {
3983         struct tcpm_port *port = typec_cap_to_tcpm(cap);
3984         int ret;
3985
3986         mutex_lock(&port->swap_lock);
3987         mutex_lock(&port->lock);
3988
3989         if (port->port_type != TYPEC_PORT_DRP) {
3990                 ret = -EINVAL;
3991                 goto port_unlock;
3992         }
3993         if (port->state != SRC_READY && port->state != SNK_READY) {
3994                 ret = -EAGAIN;
3995                 goto port_unlock;
3996         }
3997
3998         if (port->data_role == data) {
3999                 ret = 0;
4000                 goto port_unlock;
4001         }
4002
4003         /*
4004          * XXX
4005          * 6.3.9: If an alternate mode is active, a request to swap
4006          * alternate modes shall trigger a port reset.
4007          * Reject data role swap request in this case.
4008          */
4009
4010         if (!port->pd_capable) {
4011                 /*
4012                  * If the partner is not PD capable, reset the port to
4013                  * trigger a role change. This can only work if a preferred
4014                  * role is configured, and if it matches the requested role.
4015                  */
4016                 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
4017                     port->try_role == port->pwr_role) {
4018                         ret = -EINVAL;
4019                         goto port_unlock;
4020                 }
4021                 port->non_pd_role_swap = true;
4022                 tcpm_set_state(port, PORT_RESET, 0);
4023         } else {
4024                 tcpm_set_state(port, DR_SWAP_SEND, 0);
4025         }
4026
4027         port->swap_status = 0;
4028         port->swap_pending = true;
4029         reinit_completion(&port->swap_complete);
4030         mutex_unlock(&port->lock);
4031
4032         if (!wait_for_completion_timeout(&port->swap_complete,
4033                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4034                 ret = -ETIMEDOUT;
4035         else
4036                 ret = port->swap_status;
4037
4038         port->non_pd_role_swap = false;
4039         goto swap_unlock;
4040
4041 port_unlock:
4042         mutex_unlock(&port->lock);
4043 swap_unlock:
4044         mutex_unlock(&port->swap_lock);
4045         return ret;
4046 }
4047
4048 static int tcpm_pr_set(const struct typec_capability *cap,
4049                        enum typec_role role)
4050 {
4051         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4052         int ret;
4053
4054         mutex_lock(&port->swap_lock);
4055         mutex_lock(&port->lock);
4056
4057         if (port->port_type != TYPEC_PORT_DRP) {
4058                 ret = -EINVAL;
4059                 goto port_unlock;
4060         }
4061         if (port->state != SRC_READY && port->state != SNK_READY) {
4062                 ret = -EAGAIN;
4063                 goto port_unlock;
4064         }
4065
4066         if (role == port->pwr_role) {
4067                 ret = 0;
4068                 goto port_unlock;
4069         }
4070
4071         port->swap_status = 0;
4072         port->swap_pending = true;
4073         reinit_completion(&port->swap_complete);
4074         tcpm_set_state(port, PR_SWAP_SEND, 0);
4075         mutex_unlock(&port->lock);
4076
4077         if (!wait_for_completion_timeout(&port->swap_complete,
4078                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4079                 ret = -ETIMEDOUT;
4080         else
4081                 ret = port->swap_status;
4082
4083         goto swap_unlock;
4084
4085 port_unlock:
4086         mutex_unlock(&port->lock);
4087 swap_unlock:
4088         mutex_unlock(&port->swap_lock);
4089         return ret;
4090 }
4091
4092 static int tcpm_vconn_set(const struct typec_capability *cap,
4093                           enum typec_role role)
4094 {
4095         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4096         int ret;
4097
4098         mutex_lock(&port->swap_lock);
4099         mutex_lock(&port->lock);
4100
4101         if (port->state != SRC_READY && port->state != SNK_READY) {
4102                 ret = -EAGAIN;
4103                 goto port_unlock;
4104         }
4105
4106         if (role == port->vconn_role) {
4107                 ret = 0;
4108                 goto port_unlock;
4109         }
4110
4111         port->swap_status = 0;
4112         port->swap_pending = true;
4113         reinit_completion(&port->swap_complete);
4114         tcpm_set_state(port, VCONN_SWAP_SEND, 0);
4115         mutex_unlock(&port->lock);
4116
4117         if (!wait_for_completion_timeout(&port->swap_complete,
4118                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4119                 ret = -ETIMEDOUT;
4120         else
4121                 ret = port->swap_status;
4122
4123         goto swap_unlock;
4124
4125 port_unlock:
4126         mutex_unlock(&port->lock);
4127 swap_unlock:
4128         mutex_unlock(&port->swap_lock);
4129         return ret;
4130 }
4131
4132 static int tcpm_try_role(const struct typec_capability *cap, int role)
4133 {
4134         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4135         struct tcpc_dev *tcpc = port->tcpc;
4136         int ret = 0;
4137
4138         mutex_lock(&port->lock);
4139         if (tcpc->try_role)
4140                 ret = tcpc->try_role(tcpc, role);
4141         if (!ret && (!tcpc->config || !tcpc->config->try_role_hw))
4142                 port->try_role = role;
4143         port->try_src_count = 0;
4144         port->try_snk_count = 0;
4145         mutex_unlock(&port->lock);
4146
4147         return ret;
4148 }
4149
4150 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
4151 {
4152         unsigned int target_mw;
4153         int ret;
4154
4155         mutex_lock(&port->swap_lock);
4156         mutex_lock(&port->lock);
4157
4158         if (!port->pps_data.active) {
4159                 ret = -EOPNOTSUPP;
4160                 goto port_unlock;
4161         }
4162
4163         if (port->state != SNK_READY) {
4164                 ret = -EAGAIN;
4165                 goto port_unlock;
4166         }
4167
4168         if (op_curr > port->pps_data.max_curr) {
4169                 ret = -EINVAL;
4170                 goto port_unlock;
4171         }
4172
4173         target_mw = (op_curr * port->pps_data.out_volt) / 1000;
4174         if (target_mw < port->operating_snk_mw) {
4175                 ret = -EINVAL;
4176                 goto port_unlock;
4177         }
4178
4179         /* Round down operating current to align with PPS valid steps */
4180         op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP);
4181
4182         reinit_completion(&port->pps_complete);
4183         port->pps_data.op_curr = op_curr;
4184         port->pps_status = 0;
4185         port->pps_pending = true;
4186         tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4187         mutex_unlock(&port->lock);
4188
4189         if (!wait_for_completion_timeout(&port->pps_complete,
4190                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4191                 ret = -ETIMEDOUT;
4192         else
4193                 ret = port->pps_status;
4194
4195         goto swap_unlock;
4196
4197 port_unlock:
4198         mutex_unlock(&port->lock);
4199 swap_unlock:
4200         mutex_unlock(&port->swap_lock);
4201
4202         return ret;
4203 }
4204
4205 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
4206 {
4207         unsigned int target_mw;
4208         int ret;
4209
4210         mutex_lock(&port->swap_lock);
4211         mutex_lock(&port->lock);
4212
4213         if (!port->pps_data.active) {
4214                 ret = -EOPNOTSUPP;
4215                 goto port_unlock;
4216         }
4217
4218         if (port->state != SNK_READY) {
4219                 ret = -EAGAIN;
4220                 goto port_unlock;
4221         }
4222
4223         if (out_volt < port->pps_data.min_volt ||
4224             out_volt > port->pps_data.max_volt) {
4225                 ret = -EINVAL;
4226                 goto port_unlock;
4227         }
4228
4229         target_mw = (port->pps_data.op_curr * out_volt) / 1000;
4230         if (target_mw < port->operating_snk_mw) {
4231                 ret = -EINVAL;
4232                 goto port_unlock;
4233         }
4234
4235         /* Round down output voltage to align with PPS valid steps */
4236         out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP);
4237
4238         reinit_completion(&port->pps_complete);
4239         port->pps_data.out_volt = out_volt;
4240         port->pps_status = 0;
4241         port->pps_pending = true;
4242         tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4243         mutex_unlock(&port->lock);
4244
4245         if (!wait_for_completion_timeout(&port->pps_complete,
4246                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4247                 ret = -ETIMEDOUT;
4248         else
4249                 ret = port->pps_status;
4250
4251         goto swap_unlock;
4252
4253 port_unlock:
4254         mutex_unlock(&port->lock);
4255 swap_unlock:
4256         mutex_unlock(&port->swap_lock);
4257
4258         return ret;
4259 }
4260
4261 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
4262 {
4263         int ret = 0;
4264
4265         mutex_lock(&port->swap_lock);
4266         mutex_lock(&port->lock);
4267
4268         if (!port->pps_data.supported) {
4269                 ret = -EOPNOTSUPP;
4270                 goto port_unlock;
4271         }
4272
4273         /* Trying to deactivate PPS when already deactivated so just bail */
4274         if (!port->pps_data.active && !activate)
4275                 goto port_unlock;
4276
4277         if (port->state != SNK_READY) {
4278                 ret = -EAGAIN;
4279                 goto port_unlock;
4280         }
4281
4282         reinit_completion(&port->pps_complete);
4283         port->pps_status = 0;
4284         port->pps_pending = true;
4285
4286         /* Trigger PPS request or move back to standard PDO contract */
4287         if (activate) {
4288                 port->pps_data.out_volt = port->supply_voltage;
4289                 port->pps_data.op_curr = port->current_limit;
4290                 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4291         } else {
4292                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4293         }
4294         mutex_unlock(&port->lock);
4295
4296         if (!wait_for_completion_timeout(&port->pps_complete,
4297                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4298                 ret = -ETIMEDOUT;
4299         else
4300                 ret = port->pps_status;
4301
4302         goto swap_unlock;
4303
4304 port_unlock:
4305         mutex_unlock(&port->lock);
4306 swap_unlock:
4307         mutex_unlock(&port->swap_lock);
4308
4309         return ret;
4310 }
4311
4312 static void tcpm_init(struct tcpm_port *port)
4313 {
4314         enum typec_cc_status cc1, cc2;
4315
4316         port->tcpc->init(port->tcpc);
4317
4318         tcpm_reset_port(port);
4319
4320         /*
4321          * XXX
4322          * Should possibly wait for VBUS to settle if it was enabled locally
4323          * since tcpm_reset_port() will disable VBUS.
4324          */
4325         port->vbus_present = port->tcpc->get_vbus(port->tcpc);
4326         if (port->vbus_present)
4327                 port->vbus_never_low = true;
4328
4329         tcpm_set_state(port, tcpm_default_state(port), 0);
4330
4331         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
4332                 _tcpm_cc_change(port, cc1, cc2);
4333
4334         /*
4335          * Some adapters need a clean slate at startup, and won't recover
4336          * otherwise. So do not try to be fancy and force a clean disconnect.
4337          */
4338         tcpm_set_state(port, PORT_RESET, 0);
4339 }
4340
4341 static int tcpm_port_type_set(const struct typec_capability *cap,
4342                               enum typec_port_type type)
4343 {
4344         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4345
4346         mutex_lock(&port->lock);
4347         if (type == port->port_type)
4348                 goto port_unlock;
4349
4350         port->port_type = type;
4351
4352         if (!port->connected) {
4353                 tcpm_set_state(port, PORT_RESET, 0);
4354         } else if (type == TYPEC_PORT_SNK) {
4355                 if (!(port->pwr_role == TYPEC_SINK &&
4356                       port->data_role == TYPEC_DEVICE))
4357                         tcpm_set_state(port, PORT_RESET, 0);
4358         } else if (type == TYPEC_PORT_SRC) {
4359                 if (!(port->pwr_role == TYPEC_SOURCE &&
4360                       port->data_role == TYPEC_HOST))
4361                         tcpm_set_state(port, PORT_RESET, 0);
4362         }
4363
4364 port_unlock:
4365         mutex_unlock(&port->lock);
4366         return 0;
4367 }
4368
4369 void tcpm_tcpc_reset(struct tcpm_port *port)
4370 {
4371         mutex_lock(&port->lock);
4372         /* XXX: Maintain PD connection if possible? */
4373         tcpm_init(port);
4374         mutex_unlock(&port->lock);
4375 }
4376 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
4377
4378 static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
4379                           unsigned int nr_pdo)
4380 {
4381         unsigned int i;
4382
4383         if (nr_pdo > PDO_MAX_OBJECTS)
4384                 nr_pdo = PDO_MAX_OBJECTS;
4385
4386         for (i = 0; i < nr_pdo; i++)
4387                 dest_pdo[i] = src_pdo[i];
4388
4389         return nr_pdo;
4390 }
4391
4392 static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
4393                           unsigned int nr_vdo)
4394 {
4395         unsigned int i;
4396
4397         if (nr_vdo > VDO_MAX_OBJECTS)
4398                 nr_vdo = VDO_MAX_OBJECTS;
4399
4400         for (i = 0; i < nr_vdo; i++)
4401                 dest_vdo[i] = src_vdo[i];
4402
4403         return nr_vdo;
4404 }
4405
4406 static int tcpm_fw_get_caps(struct tcpm_port *port,
4407                             struct fwnode_handle *fwnode)
4408 {
4409         const char *cap_str;
4410         int ret;
4411         u32 mw;
4412
4413         if (!fwnode)
4414                 return -EINVAL;
4415
4416         /* USB data support is optional */
4417         ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
4418         if (ret == 0) {
4419                 port->typec_caps.data = typec_find_port_data_role(cap_str);
4420                 if (port->typec_caps.data < 0)
4421                         return -EINVAL;
4422         }
4423
4424         ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
4425         if (ret < 0)
4426                 return ret;
4427
4428         port->typec_caps.type = typec_find_port_power_role(cap_str);
4429         if (port->typec_caps.type < 0)
4430                 return -EINVAL;
4431         port->port_type = port->typec_caps.type;
4432
4433         if (port->port_type == TYPEC_PORT_SNK)
4434                 goto sink;
4435
4436         /* Get source pdos */
4437         ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4438                                              NULL, 0);
4439         if (ret <= 0)
4440                 return -EINVAL;
4441
4442         port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
4443         ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4444                                              port->src_pdo, port->nr_src_pdo);
4445         if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
4446                                             port->nr_src_pdo))
4447                 return -EINVAL;
4448
4449         if (port->port_type == TYPEC_PORT_SRC)
4450                 return 0;
4451
4452         /* Get the preferred power role for DRP */
4453         ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
4454         if (ret < 0)
4455                 return ret;
4456
4457         port->typec_caps.prefer_role = typec_find_power_role(cap_str);
4458         if (port->typec_caps.prefer_role < 0)
4459                 return -EINVAL;
4460 sink:
4461         /* Get sink pdos */
4462         ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4463                                              NULL, 0);
4464         if (ret <= 0)
4465                 return -EINVAL;
4466
4467         port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
4468         ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4469                                              port->snk_pdo, port->nr_snk_pdo);
4470         if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
4471                                             port->nr_snk_pdo))
4472                 return -EINVAL;
4473
4474         if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
4475                 return -EINVAL;
4476         port->operating_snk_mw = mw / 1000;
4477
4478         port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
4479
4480         return 0;
4481 }
4482
4483 /* Power Supply access to expose source power information */
4484 enum tcpm_psy_online_states {
4485         TCPM_PSY_OFFLINE = 0,
4486         TCPM_PSY_FIXED_ONLINE,
4487         TCPM_PSY_PROG_ONLINE,
4488 };
4489
4490 static enum power_supply_property tcpm_psy_props[] = {
4491         POWER_SUPPLY_PROP_USB_TYPE,
4492         POWER_SUPPLY_PROP_ONLINE,
4493         POWER_SUPPLY_PROP_VOLTAGE_MIN,
4494         POWER_SUPPLY_PROP_VOLTAGE_MAX,
4495         POWER_SUPPLY_PROP_VOLTAGE_NOW,
4496         POWER_SUPPLY_PROP_CURRENT_MAX,
4497         POWER_SUPPLY_PROP_CURRENT_NOW,
4498 };
4499
4500 static int tcpm_psy_get_online(struct tcpm_port *port,
4501                                union power_supply_propval *val)
4502 {
4503         if (port->vbus_charge) {
4504                 if (port->pps_data.active)
4505                         val->intval = TCPM_PSY_PROG_ONLINE;
4506                 else
4507                         val->intval = TCPM_PSY_FIXED_ONLINE;
4508         } else {
4509                 val->intval = TCPM_PSY_OFFLINE;
4510         }
4511
4512         return 0;
4513 }
4514
4515 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
4516                                     union power_supply_propval *val)
4517 {
4518         if (port->pps_data.active)
4519                 val->intval = port->pps_data.min_volt * 1000;
4520         else
4521                 val->intval = port->supply_voltage * 1000;
4522
4523         return 0;
4524 }
4525
4526 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
4527                                     union power_supply_propval *val)
4528 {
4529         if (port->pps_data.active)
4530                 val->intval = port->pps_data.max_volt * 1000;
4531         else
4532                 val->intval = port->supply_voltage * 1000;
4533
4534         return 0;
4535 }
4536
4537 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
4538                                     union power_supply_propval *val)
4539 {
4540         val->intval = port->supply_voltage * 1000;
4541
4542         return 0;
4543 }
4544
4545 static int tcpm_psy_get_current_max(struct tcpm_port *port,
4546                                     union power_supply_propval *val)
4547 {
4548         if (port->pps_data.active)
4549                 val->intval = port->pps_data.max_curr * 1000;
4550         else
4551                 val->intval = port->current_limit * 1000;
4552
4553         return 0;
4554 }
4555
4556 static int tcpm_psy_get_current_now(struct tcpm_port *port,
4557                                     union power_supply_propval *val)
4558 {
4559         val->intval = port->current_limit * 1000;
4560
4561         return 0;
4562 }
4563
4564 static int tcpm_psy_get_prop(struct power_supply *psy,
4565                              enum power_supply_property psp,
4566                              union power_supply_propval *val)
4567 {
4568         struct tcpm_port *port = power_supply_get_drvdata(psy);
4569         int ret = 0;
4570
4571         switch (psp) {
4572         case POWER_SUPPLY_PROP_USB_TYPE:
4573                 val->intval = port->usb_type;
4574                 break;
4575         case POWER_SUPPLY_PROP_ONLINE:
4576                 ret = tcpm_psy_get_online(port, val);
4577                 break;
4578         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
4579                 ret = tcpm_psy_get_voltage_min(port, val);
4580                 break;
4581         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
4582                 ret = tcpm_psy_get_voltage_max(port, val);
4583                 break;
4584         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4585                 ret = tcpm_psy_get_voltage_now(port, val);
4586                 break;
4587         case POWER_SUPPLY_PROP_CURRENT_MAX:
4588                 ret = tcpm_psy_get_current_max(port, val);
4589                 break;
4590         case POWER_SUPPLY_PROP_CURRENT_NOW:
4591                 ret = tcpm_psy_get_current_now(port, val);
4592                 break;
4593         default:
4594                 ret = -EINVAL;
4595                 break;
4596         }
4597
4598         return ret;
4599 }
4600
4601 static int tcpm_psy_set_online(struct tcpm_port *port,
4602                                const union power_supply_propval *val)
4603 {
4604         int ret;
4605
4606         switch (val->intval) {
4607         case TCPM_PSY_FIXED_ONLINE:
4608                 ret = tcpm_pps_activate(port, false);
4609                 break;
4610         case TCPM_PSY_PROG_ONLINE:
4611                 ret = tcpm_pps_activate(port, true);
4612                 break;
4613         default:
4614                 ret = -EINVAL;
4615                 break;
4616         }
4617
4618         return ret;
4619 }
4620
4621 static int tcpm_psy_set_prop(struct power_supply *psy,
4622                              enum power_supply_property psp,
4623                              const union power_supply_propval *val)
4624 {
4625         struct tcpm_port *port = power_supply_get_drvdata(psy);
4626         int ret;
4627
4628         switch (psp) {
4629         case POWER_SUPPLY_PROP_ONLINE:
4630                 ret = tcpm_psy_set_online(port, val);
4631                 break;
4632         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4633                 if (val->intval < port->pps_data.min_volt * 1000 ||
4634                     val->intval > port->pps_data.max_volt * 1000)
4635                         ret = -EINVAL;
4636                 else
4637                         ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
4638                 break;
4639         case POWER_SUPPLY_PROP_CURRENT_NOW:
4640                 if (val->intval > port->pps_data.max_curr * 1000)
4641                         ret = -EINVAL;
4642                 else
4643                         ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
4644                 break;
4645         default:
4646                 ret = -EINVAL;
4647                 break;
4648         }
4649
4650         return ret;
4651 }
4652
4653 static int tcpm_psy_prop_writeable(struct power_supply *psy,
4654                                    enum power_supply_property psp)
4655 {
4656         switch (psp) {
4657         case POWER_SUPPLY_PROP_ONLINE:
4658         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4659         case POWER_SUPPLY_PROP_CURRENT_NOW:
4660                 return 1;
4661         default:
4662                 return 0;
4663         }
4664 }
4665
4666 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
4667         POWER_SUPPLY_USB_TYPE_C,
4668         POWER_SUPPLY_USB_TYPE_PD,
4669         POWER_SUPPLY_USB_TYPE_PD_PPS,
4670 };
4671
4672 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
4673
4674 static int devm_tcpm_psy_register(struct tcpm_port *port)
4675 {
4676         struct power_supply_config psy_cfg = {};
4677         const char *port_dev_name = dev_name(port->dev);
4678         size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
4679                                      strlen(port_dev_name) + 1;
4680         char *psy_name;
4681
4682         psy_cfg.drv_data = port;
4683         psy_cfg.fwnode = dev_fwnode(port->dev);
4684         psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
4685         if (!psy_name)
4686                 return -ENOMEM;
4687
4688         snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
4689                  port_dev_name);
4690         port->psy_desc.name = psy_name;
4691         port->psy_desc.type = POWER_SUPPLY_TYPE_USB,
4692         port->psy_desc.usb_types = tcpm_psy_usb_types;
4693         port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
4694         port->psy_desc.properties = tcpm_psy_props,
4695         port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props),
4696         port->psy_desc.get_property = tcpm_psy_get_prop,
4697         port->psy_desc.set_property = tcpm_psy_set_prop,
4698         port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable,
4699
4700         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
4701
4702         port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
4703                                                &psy_cfg);
4704
4705         return PTR_ERR_OR_ZERO(port->psy);
4706 }
4707
4708 static int tcpm_copy_caps(struct tcpm_port *port,
4709                           const struct tcpc_config *tcfg)
4710 {
4711         if (tcpm_validate_caps(port, tcfg->src_pdo, tcfg->nr_src_pdo) ||
4712             tcpm_validate_caps(port, tcfg->snk_pdo, tcfg->nr_snk_pdo))
4713                 return -EINVAL;
4714
4715         port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcfg->src_pdo,
4716                                           tcfg->nr_src_pdo);
4717         port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcfg->snk_pdo,
4718                                           tcfg->nr_snk_pdo);
4719
4720         port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcfg->snk_vdo,
4721                                           tcfg->nr_snk_vdo);
4722
4723         port->operating_snk_mw = tcfg->operating_snk_mw;
4724
4725         port->typec_caps.prefer_role = tcfg->default_role;
4726         port->typec_caps.type = tcfg->type;
4727         port->typec_caps.data = tcfg->data;
4728         port->self_powered = tcfg->self_powered;
4729
4730         return 0;
4731 }
4732
4733 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
4734 {
4735         struct tcpm_port *port;
4736         int i, err;
4737
4738         if (!dev || !tcpc ||
4739             !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
4740             !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
4741             !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
4742                 return ERR_PTR(-EINVAL);
4743
4744         port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
4745         if (!port)
4746                 return ERR_PTR(-ENOMEM);
4747
4748         port->dev = dev;
4749         port->tcpc = tcpc;
4750
4751         mutex_init(&port->lock);
4752         mutex_init(&port->swap_lock);
4753
4754         port->wq = create_singlethread_workqueue(dev_name(dev));
4755         if (!port->wq)
4756                 return ERR_PTR(-ENOMEM);
4757         INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
4758         INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
4759         INIT_WORK(&port->event_work, tcpm_pd_event_handler);
4760
4761         spin_lock_init(&port->pd_event_lock);
4762
4763         init_completion(&port->tx_complete);
4764         init_completion(&port->swap_complete);
4765         init_completion(&port->pps_complete);
4766         tcpm_debugfs_init(port);
4767
4768         err = tcpm_fw_get_caps(port, tcpc->fwnode);
4769         if ((err < 0) && tcpc->config)
4770                 err = tcpm_copy_caps(port, tcpc->config);
4771         if (err < 0)
4772                 goto out_destroy_wq;
4773
4774         if (!tcpc->config || !tcpc->config->try_role_hw)
4775                 port->try_role = port->typec_caps.prefer_role;
4776         else
4777                 port->try_role = TYPEC_NO_PREFERRED_ROLE;
4778
4779         port->typec_caps.fwnode = tcpc->fwnode;
4780         port->typec_caps.revision = 0x0120;     /* Type-C spec release 1.2 */
4781         port->typec_caps.pd_revision = 0x0300;  /* USB-PD spec release 3.0 */
4782         port->typec_caps.dr_set = tcpm_dr_set;
4783         port->typec_caps.pr_set = tcpm_pr_set;
4784         port->typec_caps.vconn_set = tcpm_vconn_set;
4785         port->typec_caps.try_role = tcpm_try_role;
4786         port->typec_caps.port_type_set = tcpm_port_type_set;
4787
4788         port->partner_desc.identity = &port->partner_ident;
4789         port->port_type = port->typec_caps.type;
4790
4791         port->role_sw = usb_role_switch_get(port->dev);
4792         if (IS_ERR(port->role_sw)) {
4793                 err = PTR_ERR(port->role_sw);
4794                 goto out_destroy_wq;
4795         }
4796
4797         err = devm_tcpm_psy_register(port);
4798         if (err)
4799                 goto out_role_sw_put;
4800
4801         port->typec_port = typec_register_port(port->dev, &port->typec_caps);
4802         if (IS_ERR(port->typec_port)) {
4803                 err = PTR_ERR(port->typec_port);
4804                 goto out_role_sw_put;
4805         }
4806
4807         if (tcpc->config && tcpc->config->alt_modes) {
4808                 const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
4809
4810                 i = 0;
4811                 while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
4812                         struct typec_altmode *alt;
4813
4814                         alt = typec_port_register_altmode(port->typec_port,
4815                                                           paltmode);
4816                         if (IS_ERR(alt)) {
4817                                 tcpm_log(port,
4818                                          "%s: failed to register port alternate mode 0x%x",
4819                                          dev_name(dev), paltmode->svid);
4820                                 break;
4821                         }
4822                         typec_altmode_set_drvdata(alt, port);
4823                         alt->ops = &tcpm_altmode_ops;
4824                         port->port_altmode[i] = alt;
4825                         i++;
4826                         paltmode++;
4827                 }
4828         }
4829
4830         mutex_lock(&port->lock);
4831         tcpm_init(port);
4832         mutex_unlock(&port->lock);
4833
4834         tcpm_log(port, "%s: registered", dev_name(dev));
4835         return port;
4836
4837 out_role_sw_put:
4838         usb_role_switch_put(port->role_sw);
4839 out_destroy_wq:
4840         tcpm_debugfs_exit(port);
4841         destroy_workqueue(port->wq);
4842         return ERR_PTR(err);
4843 }
4844 EXPORT_SYMBOL_GPL(tcpm_register_port);
4845
4846 void tcpm_unregister_port(struct tcpm_port *port)
4847 {
4848         int i;
4849
4850         tcpm_reset_port(port);
4851         for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
4852                 typec_unregister_altmode(port->port_altmode[i]);
4853         typec_unregister_port(port->typec_port);
4854         usb_role_switch_put(port->role_sw);
4855         tcpm_debugfs_exit(port);
4856         destroy_workqueue(port->wq);
4857 }
4858 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
4859
4860 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
4861 MODULE_DESCRIPTION("USB Type-C Port Manager");
4862 MODULE_LICENSE("GPL");