drivers/usb/typec/stusb160x.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * STMicroelectronics STUSB160x Type-C controller family driver
   4  *
   5  * Copyright (C) 2020, STMicroelectronics
   6  * Author(s): Amelie Delaunay <amelie.delaunay@st.com>
   7  */
   8
   9 #include <linux/bitfield.h>
  10 #include <linux/i2c.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/regmap.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/usb/role.h>
  17 #include <linux/usb/typec.h>
  18
  19 #define STUSB160X_ALERT_STATUS                  0x0B /* RC */
  20 #define STUSB160X_ALERT_STATUS_MASK_CTRL        0x0C /* RW */
  21 #define STUSB160X_CC_CONNECTION_STATUS_TRANS    0x0D /* RC */
  22 #define STUSB160X_CC_CONNECTION_STATUS          0x0E /* RO */
  23 #define STUSB160X_MONITORING_STATUS_TRANS       0x0F /* RC */
  24 #define STUSB160X_MONITORING_STATUS             0x10 /* RO */
  25 #define STUSB160X_CC_OPERATION_STATUS           0x11 /* RO */
  26 #define STUSB160X_HW_FAULT_STATUS_TRANS         0x12 /* RC */
  27 #define STUSB160X_HW_FAULT_STATUS               0x13 /* RO */
  28 #define STUSB160X_CC_CAPABILITY_CTRL            0x18 /* RW */
  29 #define STUSB160X_CC_VCONN_SWITCH_CTRL          0x1E /* RW */
  30 #define STUSB160X_VCONN_MONITORING_CTRL         0x20 /* RW */
  31 #define STUSB160X_VBUS_MONITORING_RANGE_CTRL    0x22 /* RW */
  32 #define STUSB160X_RESET_CTRL                    0x23 /* RW */
  33 #define STUSB160X_VBUS_DISCHARGE_TIME_CTRL      0x25 /* RW */
  34 #define STUSB160X_VBUS_DISCHARGE_STATUS         0x26 /* RO */
  35 #define STUSB160X_VBUS_ENABLE_STATUS            0x27 /* RO */
  36 #define STUSB160X_CC_POWER_MODE_CTRL            0x28 /* RW */
  37 #define STUSB160X_VBUS_MONITORING_CTRL          0x2E /* RW */
  38 #define STUSB1600_REG_MAX                       0x2F /* RO - Reserved */
  39
  40 /* STUSB160X_ALERT_STATUS/STUSB160X_ALERT_STATUS_MASK_CTRL bitfields */
  41 #define STUSB160X_HW_FAULT                      BIT(4)
  42 #define STUSB160X_MONITORING                    BIT(5)
  43 #define STUSB160X_CC_CONNECTION                 BIT(6)
  44 #define STUSB160X_ALL_ALERTS                    GENMASK(6, 4)
  45
  46 /* STUSB160X_CC_CONNECTION_STATUS_TRANS bitfields */
  47 #define STUSB160X_CC_ATTACH_TRANS               BIT(0)
  48
  49 /* STUSB160X_CC_CONNECTION_STATUS bitfields */
  50 #define STUSB160X_CC_ATTACH                     BIT(0)
  51 #define STUSB160X_CC_VCONN_SUPPLY               BIT(1)
  52 #define STUSB160X_CC_DATA_ROLE(s)               (!!((s) & BIT(2)))
  53 #define STUSB160X_CC_POWER_ROLE(s)              (!!((s) & BIT(3)))
  54 #define STUSB160X_CC_ATTACHED_MODE              GENMASK(7, 5)
  55
  56 /* STUSB160X_MONITORING_STATUS_TRANS bitfields */
  57 #define STUSB160X_VCONN_PRESENCE_TRANS          BIT(0)
  58 #define STUSB160X_VBUS_PRESENCE_TRANS           BIT(1)
  59 #define STUSB160X_VBUS_VSAFE0V_TRANS            BIT(2)
  60 #define STUSB160X_VBUS_VALID_TRANS              BIT(3)
  61
  62 /* STUSB160X_MONITORING_STATUS bitfields */
  63 #define STUSB160X_VCONN_PRESENCE                BIT(0)
  64 #define STUSB160X_VBUS_PRESENCE                 BIT(1)
  65 #define STUSB160X_VBUS_VSAFE0V                  BIT(2)
  66 #define STUSB160X_VBUS_VALID                    BIT(3)
  67
  68 /* STUSB160X_CC_OPERATION_STATUS bitfields */
  69 #define STUSB160X_TYPEC_FSM_STATE               GENMASK(4, 0)
  70 #define STUSB160X_SINK_POWER_STATE              GENMASK(6, 5)
  71 #define STUSB160X_CC_ATTACHED                   BIT(7)
  72
  73 /* STUSB160X_HW_FAULT_STATUS_TRANS bitfields */
  74 #define STUSB160X_VCONN_SW_OVP_FAULT_TRANS      BIT(0)
  75 #define STUSB160X_VCONN_SW_OCP_FAULT_TRANS      BIT(1)
  76 #define STUSB160X_VCONN_SW_RVP_FAULT_TRANS      BIT(2)
  77 #define STUSB160X_VPU_VALID_TRANS               BIT(4)
  78 #define STUSB160X_VPU_OVP_FAULT_TRANS           BIT(5)
  79 #define STUSB160X_THERMAL_FAULT                 BIT(7)
  80
  81 /* STUSB160X_HW_FAULT_STATUS bitfields */
  82 #define STUSB160X_VCONN_SW_OVP_FAULT_CC2        BIT(0)
  83 #define STUSB160X_VCONN_SW_OVP_FAULT_CC1        BIT(1)
  84 #define STUSB160X_VCONN_SW_OCP_FAULT_CC2        BIT(2)
  85 #define STUSB160X_VCONN_SW_OCP_FAULT_CC1        BIT(3)
  86 #define STUSB160X_VCONN_SW_RVP_FAULT_CC2        BIT(4)
  87 #define STUSB160X_VCONN_SW_RVP_FAULT_CC1        BIT(5)
  88 #define STUSB160X_VPU_VALID                     BIT(6)
  89 #define STUSB160X_VPU_OVP_FAULT                 BIT(7)
  90
  91 /* STUSB160X_CC_CAPABILITY_CTRL bitfields */
  92 #define STUSB160X_CC_VCONN_SUPPLY_EN            BIT(0)
  93 #define STUSB160X_CC_VCONN_DISCHARGE_EN         BIT(4)
  94 #define STUSB160X_CC_CURRENT_ADVERTISED         GENMASK(7, 6)
  95
  96 /* STUSB160X_VCONN_SWITCH_CTRL bitfields */
  97 #define STUSB160X_CC_VCONN_SWITCH_ILIM          GENMASK(3, 0)
  98
  99 /* STUSB160X_VCONN_MONITORING_CTRL bitfields */
 100 #define STUSB160X_VCONN_UVLO_THRESHOLD          BIT(6)
 101 #define STUSB160X_VCONN_MONITORING_EN           BIT(7)
 102
 103 /* STUSB160X_VBUS_MONITORING_RANGE_CTRL bitfields */
 104 #define STUSB160X_SHIFT_LOW_VBUS_LIMIT          GENMASK(3, 0)
 105 #define STUSB160X_SHIFT_HIGH_VBUS_LIMIT         GENMASK(7, 4)
 106
 107 /* STUSB160X_RESET_CTRL bitfields */
 108 #define STUSB160X_SW_RESET_EN                   BIT(0)
 109
 110 /* STUSB160X_VBUS_DISCHARGE_TIME_CTRL bitfields */
 111 #define STUSBXX02_VBUS_DISCHARGE_TIME_TO_PDO    GENMASK(3, 0)
 112 #define STUSB160X_VBUS_DISCHARGE_TIME_TO_0V     GENMASK(7, 4)
 113
 114 /* STUSB160X_VBUS_DISCHARGE_STATUS bitfields */
 115 #define STUSB160X_VBUS_DISCHARGE_EN             BIT(7)
 116
 117 /* STUSB160X_VBUS_ENABLE_STATUS bitfields */
 118 #define STUSB160X_VBUS_SOURCE_EN                BIT(0)
 119 #define STUSB160X_VBUS_SINK_EN                  BIT(1)
 120
 121 /* STUSB160X_CC_POWER_MODE_CTRL bitfields */
 122 #define STUSB160X_CC_POWER_MODE                 GENMASK(2, 0)
 123
 124 /* STUSB160X_VBUS_MONITORING_CTRL bitfields */
 125 #define STUSB160X_VDD_UVLO_DISABLE              BIT(0)
 126 #define STUSB160X_VBUS_VSAFE0V_THRESHOLD        GENMASK(2, 1)
 127 #define STUSB160X_VBUS_RANGE_DISABLE            BIT(4)
 128 #define STUSB160X_VDD_OVLO_DISABLE              BIT(6)
 129
 130 enum stusb160x_pwr_mode {
 131         SOURCE_WITH_ACCESSORY,
 132         SINK_WITH_ACCESSORY,
 133         SINK_WITHOUT_ACCESSORY,
 134         DUAL_WITH_ACCESSORY,
 135         DUAL_WITH_ACCESSORY_AND_TRY_SRC,
 136         DUAL_WITH_ACCESSORY_AND_TRY_SNK,
 137 };
 138
 139 enum stusb160x_attached_mode {
 140         NO_DEVICE_ATTACHED,
 141         SINK_ATTACHED,
 142         SOURCE_ATTACHED,
 143         DEBUG_ACCESSORY_ATTACHED,
 144         AUDIO_ACCESSORY_ATTACHED,
 145 };
 146
 147 struct stusb160x {
 148         struct device           *dev;
 149         struct regmap           *regmap;
 150         struct regulator        *vdd_supply;
 151         struct regulator        *vsys_supply;
 152         struct regulator        *vconn_supply;
 153         struct regulator        *main_supply;
 154
 155         struct typec_port       *port;
 156         struct typec_capability capability;
 157         struct typec_partner    *partner;
 158
 159         enum typec_port_type    port_type;
 160         enum typec_pwr_opmode   pwr_opmode;
 161         bool                    vbus_on;
 162
 163         struct usb_role_switch  *role_sw;
 164 };
 165
 166 static bool stusb160x_reg_writeable(struct device *dev, unsigned int reg)
 167 {
 168         switch (reg) {
 169         case STUSB160X_ALERT_STATUS_MASK_CTRL:
 170         case STUSB160X_CC_CAPABILITY_CTRL:
 171         case STUSB160X_CC_VCONN_SWITCH_CTRL:
 172         case STUSB160X_VCONN_MONITORING_CTRL:
 173         case STUSB160X_VBUS_MONITORING_RANGE_CTRL:
 174         case STUSB160X_RESET_CTRL:
 175         case STUSB160X_VBUS_DISCHARGE_TIME_CTRL:
 176         case STUSB160X_CC_POWER_MODE_CTRL:
 177         case STUSB160X_VBUS_MONITORING_CTRL:
 178                 return true;
 179         default:
 180                 return false;
 181         }
 182 }
 183
 184 static bool stusb160x_reg_readable(struct device *dev, unsigned int reg)
 185 {
 186         if (reg <= 0x0A ||
 187             (reg >= 0x14 && reg <= 0x17) ||
 188             (reg >= 0x19 && reg <= 0x1D) ||
 189             (reg >= 0x29 && reg <= 0x2D) ||
 190             (reg == 0x1F || reg == 0x21 || reg == 0x24 || reg == 0x2F))
 191                 return false;
 192         else
 193                 return true;
 194 }
 195
 196 static bool stusb160x_reg_volatile(struct device *dev, unsigned int reg)
 197 {
 198         switch (reg) {
 199         case STUSB160X_ALERT_STATUS:
 200         case STUSB160X_CC_CONNECTION_STATUS_TRANS:
 201         case STUSB160X_CC_CONNECTION_STATUS:
 202         case STUSB160X_MONITORING_STATUS_TRANS:
 203         case STUSB160X_MONITORING_STATUS:
 204         case STUSB160X_CC_OPERATION_STATUS:
 205         case STUSB160X_HW_FAULT_STATUS_TRANS:
 206         case STUSB160X_HW_FAULT_STATUS:
 207         case STUSB160X_VBUS_DISCHARGE_STATUS:
 208         case STUSB160X_VBUS_ENABLE_STATUS:
 209                 return true;
 210         default:
 211                 return false;
 212         }
 213 }
 214
 215 static bool stusb160x_reg_precious(struct device *dev, unsigned int reg)
 216 {
 217         switch (reg) {
 218         case STUSB160X_ALERT_STATUS:
 219         case STUSB160X_CC_CONNECTION_STATUS_TRANS:
 220         case STUSB160X_MONITORING_STATUS_TRANS:
 221         case STUSB160X_HW_FAULT_STATUS_TRANS:
 222                 return true;
 223         default:
 224                 return false;
 225         }
 226 }
 227
 228 static const struct regmap_config stusb1600_regmap_config = {
 229         .reg_bits       = 8,
 230         .reg_stride     = 1,
 231         .val_bits       = 8,
 232         .max_register   = STUSB1600_REG_MAX,
 233         .writeable_reg  = stusb160x_reg_writeable,
 234         .readable_reg   = stusb160x_reg_readable,
 235         .volatile_reg   = stusb160x_reg_volatile,
 236         .precious_reg   = stusb160x_reg_precious,
 237         .cache_type     = REGCACHE_RBTREE,
 238 };
 239
 240 static bool stusb160x_get_vconn(struct stusb160x *chip)
 241 {
 242         u32 val;
 243         int ret;
 244
 245         ret = regmap_read(chip->regmap, STUSB160X_CC_CAPABILITY_CTRL, &val);
 246         if (ret) {
 247                 dev_err(chip->dev, "Unable to get Vconn status: %d\n", ret);
 248                 return false;
 249         }
 250
 251         return !!FIELD_GET(STUSB160X_CC_VCONN_SUPPLY_EN, val);
 252 }
 253
 254 static int stusb160x_set_vconn(struct stusb160x *chip, bool on)
 255 {
 256         int ret;
 257
 258         /* Manage VCONN input supply */
 259         if (chip->vconn_supply) {
 260                 if (on) {
 261                         ret = regulator_enable(chip->vconn_supply);
 262                         if (ret) {
 263                                 dev_err(chip->dev,
 264                                         "failed to enable vconn supply: %d\n",
 265                                         ret);
 266                                 return ret;
 267                         }
 268                 } else {
 269                         regulator_disable(chip->vconn_supply);
 270                 }
 271         }
 272
 273         /* Manage VCONN monitoring and power path */
 274         ret = regmap_update_bits(chip->regmap, STUSB160X_VCONN_MONITORING_CTRL,
 275                                  STUSB160X_VCONN_MONITORING_EN,
 276                                  on ? STUSB160X_VCONN_MONITORING_EN : 0);
 277         if (ret)
 278                 goto vconn_reg_disable;
 279
 280         return 0;
 281
 282 vconn_reg_disable:
 283         if (chip->vconn_supply && on)
 284                 regulator_disable(chip->vconn_supply);
 285
 286         return ret;
 287 }
 288
 289 static enum typec_pwr_opmode stusb160x_get_pwr_opmode(struct stusb160x *chip)
 290 {
 291         u32 val;
 292         int ret;
 293
 294         ret = regmap_read(chip->regmap, STUSB160X_CC_CAPABILITY_CTRL, &val);
 295         if (ret) {
 296                 dev_err(chip->dev, "Unable to get pwr opmode: %d\n", ret);
 297                 return TYPEC_PWR_MODE_USB;
 298         }
 299
 300         return FIELD_GET(STUSB160X_CC_CURRENT_ADVERTISED, val);
 301 }
 302
 303 static enum typec_accessory stusb160x_get_accessory(u32 status)
 304 {
 305         enum stusb160x_attached_mode mode;
 306
 307         mode = FIELD_GET(STUSB160X_CC_ATTACHED_MODE, status);
 308
 309         switch (mode) {
 310         case DEBUG_ACCESSORY_ATTACHED:
 311                 return TYPEC_ACCESSORY_DEBUG;
 312         case AUDIO_ACCESSORY_ATTACHED:
 313                 return TYPEC_ACCESSORY_AUDIO;
 314         default:
 315                 return TYPEC_ACCESSORY_NONE;
 316         }
 317 }
 318
 319 static enum typec_role stusb160x_get_vconn_role(u32 status)
 320 {
 321         if (FIELD_GET(STUSB160X_CC_VCONN_SUPPLY, status))
 322                 return TYPEC_SOURCE;
 323
 324         return TYPEC_SINK;
 325 }
 326
 327 static void stusb160x_set_data_role(struct stusb160x *chip,
 328                                     enum typec_data_role data_role,
 329                                     bool attached)
 330 {
 331         enum usb_role usb_role = USB_ROLE_NONE;
 332
 333         if (attached) {
 334                 if (data_role == TYPEC_HOST)
 335                         usb_role = USB_ROLE_HOST;
 336                 else
 337                         usb_role = USB_ROLE_DEVICE;
 338         }
 339
 340         usb_role_switch_set_role(chip->role_sw, usb_role);
 341         typec_set_data_role(chip->port, data_role);
 342 }
 343
 344 static int stusb160x_attach(struct stusb160x *chip, u32 status)
 345 {
 346         struct typec_partner_desc desc;
 347         int ret;
 348
 349         if ((STUSB160X_CC_POWER_ROLE(status) == TYPEC_SOURCE) &&
 350             chip->vdd_supply) {
 351                 ret = regulator_enable(chip->vdd_supply);
 352                 if (ret) {
 353                         dev_err(chip->dev,
 354                                 "Failed to enable Vbus supply: %d\n", ret);
 355                         return ret;
 356                 }
 357                 chip->vbus_on = true;
 358         }
 359
 360         desc.usb_pd = false;
 361         desc.accessory = stusb160x_get_accessory(status);
 362         desc.identity = NULL;
 363
 364         chip->partner = typec_register_partner(chip->port, &desc);
 365         if (IS_ERR(chip->partner)) {
 366                 ret = PTR_ERR(chip->partner);
 367                 goto vbus_disable;
 368         }
 369
 370         typec_set_pwr_role(chip->port, STUSB160X_CC_POWER_ROLE(status));
 371         typec_set_pwr_opmode(chip->port, stusb160x_get_pwr_opmode(chip));
 372         typec_set_vconn_role(chip->port, stusb160x_get_vconn_role(status));
 373         stusb160x_set_data_role(chip, STUSB160X_CC_DATA_ROLE(status), true);
 374
 375         return 0;
 376
 377 vbus_disable:
 378         if (chip->vbus_on) {
 379                 regulator_disable(chip->vdd_supply);
 380                 chip->vbus_on = false;
 381         }
 382
 383         return ret;
 384 }
 385
 386 static void stusb160x_detach(struct stusb160x *chip, u32 status)
 387 {
 388         typec_unregister_partner(chip->partner);
 389         chip->partner = NULL;
 390
 391         typec_set_pwr_role(chip->port, STUSB160X_CC_POWER_ROLE(status));
 392         typec_set_pwr_opmode(chip->port, TYPEC_PWR_MODE_USB);
 393         typec_set_vconn_role(chip->port, stusb160x_get_vconn_role(status));
 394         stusb160x_set_data_role(chip, STUSB160X_CC_DATA_ROLE(status), false);
 395
 396         if (chip->vbus_on) {
 397                 regulator_disable(chip->vdd_supply);
 398                 chip->vbus_on = false;
 399         }
 400 }
 401
 402 static irqreturn_t stusb160x_irq_handler(int irq, void *data)
 403 {
 404         struct stusb160x *chip = data;
 405         u32 pending, trans, status;
 406         int ret;
 407
 408         ret = regmap_read(chip->regmap, STUSB160X_ALERT_STATUS, &pending);
 409         if (ret)
 410                 goto err;
 411
 412         if (pending & STUSB160X_CC_CONNECTION) {
 413                 ret = regmap_read(chip->regmap,
 414                                   STUSB160X_CC_CONNECTION_STATUS_TRANS, &trans);
 415                 if (ret)
 416                         goto err;
 417                 ret = regmap_read(chip->regmap,
 418                                   STUSB160X_CC_CONNECTION_STATUS, &status);
 419                 if (ret)
 420                         goto err;
 421
 422                 if (trans & STUSB160X_CC_ATTACH_TRANS) {
 423                         if (status & STUSB160X_CC_ATTACH) {
 424                                 ret = stusb160x_attach(chip, status);
 425                                 if (ret)
 426                                         goto err;
 427                         } else {
 428                                 stusb160x_detach(chip, status);
 429                         }
 430                 }
 431         }
 432 err:
 433         return IRQ_HANDLED;
 434 }
 435
 436 static int stusb160x_irq_init(struct stusb160x *chip, int irq)
 437 {
 438         u32 status;
 439         int ret;
 440
 441         ret = regmap_read(chip->regmap,
 442                           STUSB160X_CC_CONNECTION_STATUS, &status);
 443         if (ret)
 444                 return ret;
 445
 446         if (status & STUSB160X_CC_ATTACH) {
 447                 ret = stusb160x_attach(chip, status);
 448                 if (ret)
 449                         dev_err(chip->dev, "attach failed: %d\n", ret);
 450         }
 451
 452         ret = devm_request_threaded_irq(chip->dev, irq, NULL,
 453                                         stusb160x_irq_handler, IRQF_ONESHOT,
 454                                         dev_name(chip->dev), chip);
 455         if (ret)
 456                 goto partner_unregister;
 457
 458         /* Unmask CC_CONNECTION events */
 459         ret = regmap_write_bits(chip->regmap, STUSB160X_ALERT_STATUS_MASK_CTRL,
 460                                 STUSB160X_CC_CONNECTION, 0);
 461         if (ret)
 462                 goto partner_unregister;
 463
 464         return 0;
 465
 466 partner_unregister:
 467         if (chip->partner) {
 468                 typec_unregister_partner(chip->partner);
 469                 chip->partner = NULL;
 470         }
 471
 472         return ret;
 473 }
 474
 475 static int stusb160x_chip_init(struct stusb160x *chip)
 476 {
 477         u32 val;
 478         int ret;
 479
 480         /* Change the default Type-C power mode */
 481         if (chip->port_type == TYPEC_PORT_SRC)
 482                 ret = regmap_update_bits(chip->regmap,
 483                                          STUSB160X_CC_POWER_MODE_CTRL,
 484                                          STUSB160X_CC_POWER_MODE,
 485                                          SOURCE_WITH_ACCESSORY);
 486         else if (chip->port_type == TYPEC_PORT_SNK)
 487                 ret = regmap_update_bits(chip->regmap,
 488                                          STUSB160X_CC_POWER_MODE_CTRL,
 489                                          STUSB160X_CC_POWER_MODE,
 490                                          SINK_WITH_ACCESSORY);
 491         else /* (chip->port_type == TYPEC_PORT_DRP) */
 492                 ret = regmap_update_bits(chip->regmap,
 493                                          STUSB160X_CC_POWER_MODE_CTRL,
 494                                          STUSB160X_CC_POWER_MODE,
 495                                          DUAL_WITH_ACCESSORY);
 496         if (ret)
 497                 return ret;
 498
 499         if (chip->port_type == TYPEC_PORT_SNK)
 500                 goto skip_src;
 501
 502         /* Change the default Type-C Source power operation mode capability */
 503         ret = regmap_update_bits(chip->regmap, STUSB160X_CC_CAPABILITY_CTRL,
 504                                  STUSB160X_CC_CURRENT_ADVERTISED,
 505                                  FIELD_PREP(STUSB160X_CC_CURRENT_ADVERTISED,
 506                                             chip->pwr_opmode));
 507         if (ret)
 508                 return ret;
 509
 510         /* Manage Type-C Source Vconn supply */
 511         if (stusb160x_get_vconn(chip)) {
 512                 ret = stusb160x_set_vconn(chip, true);
 513                 if (ret)
 514                         return ret;
 515         }
 516
 517 skip_src:
 518         /* Mask all events interrupts - to be unmasked with interrupt support */
 519         ret = regmap_update_bits(chip->regmap, STUSB160X_ALERT_STATUS_MASK_CTRL,
 520                                  STUSB160X_ALL_ALERTS, STUSB160X_ALL_ALERTS);
 521         if (ret)
 522                 return ret;
 523
 524         /* Read status at least once to clear any stale interrupts */
 525         regmap_read(chip->regmap, STUSB160X_ALERT_STATUS, &val);
 526         regmap_read(chip->regmap, STUSB160X_CC_CONNECTION_STATUS_TRANS, &val);
 527         regmap_read(chip->regmap, STUSB160X_MONITORING_STATUS_TRANS, &val);
 528         regmap_read(chip->regmap, STUSB160X_HW_FAULT_STATUS_TRANS, &val);
 529
 530         return 0;
 531 }
 532
 533 static int stusb160x_get_fw_caps(struct stusb160x *chip,
 534                                  struct fwnode_handle *fwnode)
 535 {
 536         const char *cap_str;
 537         int ret;
 538
 539         chip->capability.fwnode = fwnode;
 540
 541         /*
 542          * Supported port type can be configured through device tree
 543          * else it is read from chip registers in stusb160x_get_caps.
 544          */
 545         ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
 546         if (!ret) {
 547                 ret = typec_find_port_power_role(cap_str);
 548                 if (ret < 0)
 549                         return ret;
 550                 chip->port_type = ret;
 551         }
 552         chip->capability.type = chip->port_type;
 553
 554         /* Skip DRP/Source capabilities in case of Sink only */
 555         if (chip->port_type == TYPEC_PORT_SNK)
 556                 return 0;
 557
 558         if (chip->port_type == TYPEC_PORT_DRP)
 559                 chip->capability.prefer_role = TYPEC_SINK;
 560
 561         /*
 562          * Supported power operation mode can be configured through device tree
 563          * else it is read from chip registers in stusb160x_get_caps.
 564          */
 565         ret = fwnode_property_read_string(fwnode, "power-opmode", &cap_str);
 566         if (!ret) {
 567                 ret = typec_find_pwr_opmode(cap_str);
 568                 /* Power delivery not yet supported */
 569                 if (ret < 0 || ret == TYPEC_PWR_MODE_PD) {
 570                         dev_err(chip->dev, "bad power operation mode: %d\n", ret);
 571                         return -EINVAL;
 572                 }
 573                 chip->pwr_opmode = ret;
 574         }
 575
 576         return 0;
 577 }
 578
 579 static int stusb160x_get_caps(struct stusb160x *chip)
 580 {
 581         enum typec_port_type *type = &chip->capability.type;
 582         enum typec_port_data *data = &chip->capability.data;
 583         enum typec_accessory *accessory = chip->capability.accessory;
 584         u32 val;
 585         int ret;
 586
 587         chip->capability.revision = USB_TYPEC_REV_1_2;
 588
 589         ret = regmap_read(chip->regmap, STUSB160X_CC_POWER_MODE_CTRL, &val);
 590         if (ret)
 591                 return ret;
 592
 593         switch (FIELD_GET(STUSB160X_CC_POWER_MODE, val)) {
 594         case SOURCE_WITH_ACCESSORY:
 595                 *type = TYPEC_PORT_SRC;
 596                 *data = TYPEC_PORT_DFP;
 597                 *accessory++ = TYPEC_ACCESSORY_AUDIO;
 598                 *accessory++ = TYPEC_ACCESSORY_DEBUG;
 599                 break;
 600         case SINK_WITH_ACCESSORY:
 601                 *type = TYPEC_PORT_SNK;
 602                 *data = TYPEC_PORT_UFP;
 603                 *accessory++ = TYPEC_ACCESSORY_AUDIO;
 604                 *accessory++ = TYPEC_ACCESSORY_DEBUG;
 605                 break;
 606         case SINK_WITHOUT_ACCESSORY:
 607                 *type = TYPEC_PORT_SNK;
 608                 *data = TYPEC_PORT_UFP;
 609                 break;
 610         case DUAL_WITH_ACCESSORY:
 611         case DUAL_WITH_ACCESSORY_AND_TRY_SRC:
 612         case DUAL_WITH_ACCESSORY_AND_TRY_SNK:
 613                 *type = TYPEC_PORT_DRP;
 614                 *data = TYPEC_PORT_DRD;
 615                 *accessory++ = TYPEC_ACCESSORY_AUDIO;
 616                 *accessory++ = TYPEC_ACCESSORY_DEBUG;
 617                 break;
 618         default:
 619                 return -EINVAL;
 620         }
 621
 622         chip->port_type = *type;
 623         chip->pwr_opmode = stusb160x_get_pwr_opmode(chip);
 624
 625         return 0;
 626 }
 627
 628 static const struct of_device_id stusb160x_of_match[] = {
 629         { .compatible = "st,stusb1600", .data = &stusb1600_regmap_config},
 630         {},
 631 };
 632 MODULE_DEVICE_TABLE(of, stusb160x_of_match);
 633
 634 static int stusb160x_probe(struct i2c_client *client)
 635 {
 636         struct stusb160x *chip;
 637         const struct of_device_id *match;
 638         struct regmap_config *regmap_config;
 639         struct fwnode_handle *fwnode;
 640         int ret;
 641
 642         chip = devm_kzalloc(&client->dev, sizeof(struct stusb160x), GFP_KERNEL);
 643         if (!chip)
 644                 return -ENOMEM;
 645
 646         i2c_set_clientdata(client, chip);
 647
 648         match = i2c_of_match_device(stusb160x_of_match, client);
 649         regmap_config = (struct regmap_config *)match->data;
 650         chip->regmap = devm_regmap_init_i2c(client, regmap_config);
 651         if (IS_ERR(chip->regmap)) {
 652                 ret = PTR_ERR(chip->regmap);
 653                 dev_err(&client->dev,
 654                         "Failed to allocate register map:%d\n", ret);
 655                 return ret;
 656         }
 657
 658         chip->dev = &client->dev;
 659
 660         chip->vsys_supply = devm_regulator_get_optional(chip->dev, "vsys");
 661         if (IS_ERR(chip->vsys_supply)) {
 662                 ret = PTR_ERR(chip->vsys_supply);
 663                 if (ret != -ENODEV)
 664                         return ret;
 665                 chip->vsys_supply = NULL;
 666         }
 667
 668         chip->vdd_supply = devm_regulator_get_optional(chip->dev, "vdd");
 669         if (IS_ERR(chip->vdd_supply)) {
 670                 ret = PTR_ERR(chip->vdd_supply);
 671                 if (ret != -ENODEV)
 672                         return ret;
 673                 chip->vdd_supply = NULL;
 674         }
 675
 676         chip->vconn_supply = devm_regulator_get_optional(chip->dev, "vconn");
 677         if (IS_ERR(chip->vconn_supply)) {
 678                 ret = PTR_ERR(chip->vconn_supply);
 679                 if (ret != -ENODEV)
 680                         return ret;
 681                 chip->vconn_supply = NULL;
 682         }
 683
 684         fwnode = device_get_named_child_node(chip->dev, "connector");
 685         if (IS_ERR(fwnode))
 686                 return PTR_ERR(fwnode);
 687
 688         /*
 689          * When both VDD and VSYS power supplies are present, the low power
 690          * supply VSYS is selected when VSYS voltage is above 3.1 V.
 691          * Otherwise VDD is selected.
 692          */
 693         if (chip->vdd_supply &&
 694             (!chip->vsys_supply ||
 695              (regulator_get_voltage(chip->vsys_supply) <= 3100000)))
 696                 chip->main_supply = chip->vdd_supply;
 697         else
 698                 chip->main_supply = chip->vsys_supply;
 699
 700         if (chip->main_supply) {
 701                 ret = regulator_enable(chip->main_supply);
 702                 if (ret) {
 703                         dev_err(chip->dev,
 704                                 "Failed to enable main supply: %d\n", ret);
 705                         goto fwnode_put;
 706                 }
 707         }
 708
 709         /* Get configuration from chip */
 710         ret = stusb160x_get_caps(chip);
 711         if (ret) {
 712                 dev_err(chip->dev, "Failed to get port caps: %d\n", ret);
 713                 goto main_reg_disable;
 714         }
 715
 716         /* Get optional re-configuration from device tree */
 717         ret = stusb160x_get_fw_caps(chip, fwnode);
 718         if (ret) {
 719                 dev_err(chip->dev, "Failed to get connector caps: %d\n", ret);
 720                 goto main_reg_disable;
 721         }
 722
 723         ret = stusb160x_chip_init(chip);
 724         if (ret) {
 725                 dev_err(chip->dev, "Failed to init port: %d\n", ret);
 726                 goto main_reg_disable;
 727         }
 728
 729         chip->port = typec_register_port(chip->dev, &chip->capability);
 730         if (IS_ERR(chip->port)) {
 731                 ret = PTR_ERR(chip->port);
 732                 goto all_reg_disable;
 733         }
 734
 735         /*
 736          * Default power operation mode initialization: will be updated upon
 737          * attach/detach interrupt
 738          */
 739         typec_set_pwr_opmode(chip->port, chip->pwr_opmode);
 740
 741         if (client->irq) {
 742                 ret = stusb160x_irq_init(chip, client->irq);
 743                 if (ret)
 744                         goto port_unregister;
 745
 746                 chip->role_sw = fwnode_usb_role_switch_get(fwnode);
 747                 if (IS_ERR(chip->role_sw)) {
 748                         ret = PTR_ERR(chip->role_sw);
 749                         if (ret != -EPROBE_DEFER)
 750                                 dev_err(chip->dev,
 751                                         "Failed to get usb role switch: %d\n",
 752                                         ret);
 753                         goto port_unregister;
 754                 }
 755         } else {
 756                 /*
 757                  * If Source or Dual power role, need to enable VDD supply
 758                  * providing Vbus if present. In case of interrupt support,
 759                  * VDD supply will be dynamically managed upon attach/detach
 760                  * interrupt.
 761                  */
 762                 if (chip->port_type != TYPEC_PORT_SNK && chip->vdd_supply) {
 763                         ret = regulator_enable(chip->vdd_supply);
 764                         if (ret) {
 765                                 dev_err(chip->dev,
 766                                         "Failed to enable VDD supply: %d\n",
 767                                         ret);
 768                                 goto port_unregister;
 769                         }
 770                         chip->vbus_on = true;
 771                 }
 772         }
 773
 774         fwnode_handle_put(fwnode);
 775
 776         return 0;
 777
 778 port_unregister:
 779         typec_unregister_port(chip->port);
 780 all_reg_disable:
 781         if (stusb160x_get_vconn(chip))
 782                 stusb160x_set_vconn(chip, false);
 783 main_reg_disable:
 784         if (chip->main_supply)
 785                 regulator_disable(chip->main_supply);
 786 fwnode_put:
 787         fwnode_handle_put(fwnode);
 788
 789         return ret;
 790 }
 791
 792 static int stusb160x_remove(struct i2c_client *client)
 793 {
 794         struct stusb160x *chip = i2c_get_clientdata(client);
 795
 796         if (chip->partner) {
 797                 typec_unregister_partner(chip->partner);
 798                 chip->partner = NULL;
 799         }
 800
 801         if (chip->vbus_on)
 802                 regulator_disable(chip->vdd_supply);
 803
 804         if (chip->role_sw)
 805                 usb_role_switch_put(chip->role_sw);
 806
 807         typec_unregister_port(chip->port);
 808
 809         if (stusb160x_get_vconn(chip))
 810                 stusb160x_set_vconn(chip, false);
 811
 812         if (chip->main_supply)
 813                 regulator_disable(chip->main_supply);
 814
 815         return 0;
 816 }
 817
 818 static int __maybe_unused stusb160x_suspend(struct device *dev)
 819 {
 820         struct stusb160x *chip = dev_get_drvdata(dev);
 821
 822         /* Mask interrupts */
 823         return regmap_update_bits(chip->regmap,
 824                                   STUSB160X_ALERT_STATUS_MASK_CTRL,
 825                                   STUSB160X_ALL_ALERTS, STUSB160X_ALL_ALERTS);
 826 }
 827
 828 static int __maybe_unused stusb160x_resume(struct device *dev)
 829 {
 830         struct stusb160x *chip = dev_get_drvdata(dev);
 831         u32 status;
 832         int ret;
 833
 834         ret = regcache_sync(chip->regmap);
 835         if (ret)
 836                 return ret;
 837
 838         /* Check if attach/detach occurred during low power */
 839         ret = regmap_read(chip->regmap,
 840                           STUSB160X_CC_CONNECTION_STATUS, &status);
 841         if (ret)
 842                 return ret;
 843
 844         if (chip->partner && !(status & STUSB160X_CC_ATTACH))
 845                 stusb160x_detach(chip, status);
 846
 847         if (!chip->partner && (status & STUSB160X_CC_ATTACH)) {
 848                 ret = stusb160x_attach(chip, status);
 849                 if (ret)
 850                         dev_err(chip->dev, "attach failed: %d\n", ret);
 851         }
 852
 853         /* Unmask interrupts */
 854         return regmap_write_bits(chip->regmap, STUSB160X_ALERT_STATUS_MASK_CTRL,
 855                                  STUSB160X_CC_CONNECTION, 0);
 856 }
 857
 858 static SIMPLE_DEV_PM_OPS(stusb160x_pm_ops, stusb160x_suspend, stusb160x_resume);
 859
 860 static struct i2c_driver stusb160x_driver = {
 861         .driver = {
 862                 .name = "stusb160x",
 863                 .pm = &stusb160x_pm_ops,
 864                 .of_match_table = stusb160x_of_match,
 865         },
 866         .probe_new = stusb160x_probe,
 867         .remove = stusb160x_remove,
 868 };
 869 module_i2c_driver(stusb160x_driver);
 870
 871 MODULE_AUTHOR("Amelie Delaunay <amelie.delaunay@st.com>");
 872 MODULE_DESCRIPTION("STMicroelectronics STUSB160x Type-C controller driver");
 873 MODULE_LICENSE("GPL v2");