drivers/usb/typec/altmodes/displayport.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * USB Typec-C DisplayPort Alternate Mode driver
   4  *
   5  * Copyright (C) 2018 Intel Corporation
   6  * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
   7  *
   8  * DisplayPort is trademark of VESA (www.vesa.org)
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/mutex.h>
  13 #include <linux/module.h>
  14 #include <linux/property.h>
  15 #include <linux/usb/pd_vdo.h>
  16 #include <linux/usb/typec_dp.h>
  17 #include <drm/drm_connector.h>
  18 #include "displayport.h"
  19
  20 #define DP_HEADER(_dp, ver, cmd)        (VDO((_dp)->alt->svid, 1, ver, cmd)     \
  21                                          | VDO_OPOS(USB_TYPEC_DP_MODE))
  22
  23 enum {
  24         DP_CONF_USB,
  25         DP_CONF_DFP_D,
  26         DP_CONF_UFP_D,
  27         DP_CONF_DUAL_D,
  28 };
  29
  30 /* Pin assignments that use USB3.1 Gen2 signaling to carry DP protocol */
  31 #define DP_PIN_ASSIGN_GEN2_BR_MASK      (BIT(DP_PIN_ASSIGN_A) | \
  32                                          BIT(DP_PIN_ASSIGN_B))
  33
  34 /* Pin assignments that use DP v1.3 signaling to carry DP protocol */
  35 #define DP_PIN_ASSIGN_DP_BR_MASK        (BIT(DP_PIN_ASSIGN_C) | \
  36                                          BIT(DP_PIN_ASSIGN_D) | \
  37                                          BIT(DP_PIN_ASSIGN_E) | \
  38                                          BIT(DP_PIN_ASSIGN_F))
  39
  40 /* DP only pin assignments */
  41 #define DP_PIN_ASSIGN_DP_ONLY_MASK      (BIT(DP_PIN_ASSIGN_A) | \
  42                                          BIT(DP_PIN_ASSIGN_C) | \
  43                                          BIT(DP_PIN_ASSIGN_E))
  44
  45 /* Pin assignments where one channel is for USB */
  46 #define DP_PIN_ASSIGN_MULTI_FUNC_MASK   (BIT(DP_PIN_ASSIGN_B) | \
  47                                          BIT(DP_PIN_ASSIGN_D) | \
  48                                          BIT(DP_PIN_ASSIGN_F))
  49
  50 enum dp_state {
  51         DP_STATE_IDLE,
  52         DP_STATE_ENTER,
  53         DP_STATE_UPDATE,
  54         DP_STATE_CONFIGURE,
  55         DP_STATE_EXIT,
  56 };
  57
  58 struct dp_altmode {
  59         struct typec_displayport_data data;
  60
  61         enum dp_state state;
  62         bool hpd;
  63         bool pending_hpd;
  64
  65         struct mutex lock; /* device lock */
  66         struct work_struct work;
  67         struct typec_altmode *alt;
  68         const struct typec_altmode *port;
  69         struct fwnode_handle *connector_fwnode;
  70 };
  71
  72 static int dp_altmode_notify(struct dp_altmode *dp)
  73 {
  74         unsigned long conf;
  75         u8 state;
  76
  77         if (dp->data.conf) {
  78                 state = get_count_order(DP_CONF_GET_PIN_ASSIGN(dp->data.conf));
  79                 conf = TYPEC_MODAL_STATE(state);
  80         } else {
  81                 conf = TYPEC_STATE_USB;
  82         }
  83
  84         return typec_altmode_notify(dp->alt, conf, &dp->data);
  85 }
  86
  87 static int dp_altmode_configure(struct dp_altmode *dp, u8 con)
  88 {
  89         u8 pin_assign = 0;
  90         u32 conf;
  91
  92         /* DP Signalling */
  93         conf = (dp->data.conf & DP_CONF_SIGNALLING_MASK) >> DP_CONF_SIGNALLING_SHIFT;
  94
  95         switch (con) {
  96         case DP_STATUS_CON_DISABLED:
  97                 return 0;
  98         case DP_STATUS_CON_DFP_D:
  99                 conf |= DP_CONF_UFP_U_AS_DFP_D;
 100                 pin_assign = DP_CAP_UFP_D_PIN_ASSIGN(dp->alt->vdo) &
 101                              DP_CAP_DFP_D_PIN_ASSIGN(dp->port->vdo);
 102                 break;
 103         case DP_STATUS_CON_UFP_D:
 104         case DP_STATUS_CON_BOTH: /* NOTE: First acting as DP source */
 105                 conf |= DP_CONF_UFP_U_AS_UFP_D;
 106                 pin_assign = DP_CAP_PIN_ASSIGN_UFP_D(dp->alt->vdo) &
 107                                  DP_CAP_PIN_ASSIGN_DFP_D(dp->port->vdo);
 108                 break;
 109         default:
 110                 break;
 111         }
 112
 113         /* Determining the initial pin assignment. */
 114         if (!DP_CONF_GET_PIN_ASSIGN(dp->data.conf)) {
 115                 /* Is USB together with DP preferred */
 116                 if (dp->data.status & DP_STATUS_PREFER_MULTI_FUNC &&
 117                     pin_assign & DP_PIN_ASSIGN_MULTI_FUNC_MASK)
 118                         pin_assign &= DP_PIN_ASSIGN_MULTI_FUNC_MASK;
 119                 else if (pin_assign & DP_PIN_ASSIGN_DP_ONLY_MASK) {
 120                         pin_assign &= DP_PIN_ASSIGN_DP_ONLY_MASK;
 121                         /* Default to pin assign C if available */
 122                         if (pin_assign & BIT(DP_PIN_ASSIGN_C))
 123                                 pin_assign = BIT(DP_PIN_ASSIGN_C);
 124                 }
 125
 126                 if (!pin_assign)
 127                         return -EINVAL;
 128
 129                 conf |= DP_CONF_SET_PIN_ASSIGN(pin_assign);
 130         }
 131
 132         dp->data.conf = conf;
 133
 134         return 0;
 135 }
 136
 137 static int dp_altmode_status_update(struct dp_altmode *dp)
 138 {
 139         bool configured = !!DP_CONF_GET_PIN_ASSIGN(dp->data.conf);
 140         bool hpd = !!(dp->data.status & DP_STATUS_HPD_STATE);
 141         u8 con = DP_STATUS_CONNECTION(dp->data.status);
 142         int ret = 0;
 143
 144         if (configured && (dp->data.status & DP_STATUS_SWITCH_TO_USB)) {
 145                 dp->data.conf = 0;
 146                 dp->state = DP_STATE_CONFIGURE;
 147         } else if (dp->data.status & DP_STATUS_EXIT_DP_MODE) {
 148                 dp->state = DP_STATE_EXIT;
 149         } else if (!(con & DP_CONF_CURRENTLY(dp->data.conf))) {
 150                 ret = dp_altmode_configure(dp, con);
 151                 if (!ret) {
 152                         dp->state = DP_STATE_CONFIGURE;
 153                         if (dp->hpd != hpd) {
 154                                 dp->hpd = hpd;
 155                                 dp->pending_hpd = true;
 156                         }
 157                 }
 158         } else {
 159                 drm_connector_oob_hotplug_event(dp->connector_fwnode,
 160                                                 hpd ? connector_status_connected :
 161                                                       connector_status_disconnected);
 162                 dp->hpd = hpd;
 163                 sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd");
 164         }
 165
 166         return ret;
 167 }
 168
 169 static int dp_altmode_configured(struct dp_altmode *dp)
 170 {
 171         sysfs_notify(&dp->alt->dev.kobj, "displayport", "configuration");
 172         sysfs_notify(&dp->alt->dev.kobj, "displayport", "pin_assignment");
 173         /*
 174          * If the DFP_D/UFP_D sends a change in HPD when first notifying the
 175          * DisplayPort driver that it is connected, then we wait until
 176          * configuration is complete to signal HPD.
 177          */
 178         if (dp->pending_hpd) {
 179                 drm_connector_oob_hotplug_event(dp->connector_fwnode,
 180                                                 connector_status_connected);
 181                 sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd");
 182                 dp->pending_hpd = false;
 183         }
 184
 185         return dp_altmode_notify(dp);
 186 }
 187
 188 static int dp_altmode_configure_vdm(struct dp_altmode *dp, u32 conf)
 189 {
 190         int svdm_version = typec_altmode_get_svdm_version(dp->alt);
 191         u32 header;
 192         int ret;
 193
 194         if (svdm_version < 0)
 195                 return svdm_version;
 196
 197         header = DP_HEADER(dp, svdm_version, DP_CMD_CONFIGURE);
 198         ret = typec_altmode_notify(dp->alt, TYPEC_STATE_SAFE, &dp->data);
 199         if (ret) {
 200                 dev_err(&dp->alt->dev,
 201                         "unable to put to connector to safe mode\n");
 202                 return ret;
 203         }
 204
 205         ret = typec_altmode_vdm(dp->alt, header, &conf, 2);
 206         if (ret)
 207                 dp_altmode_notify(dp);
 208
 209         return ret;
 210 }
 211
 212 static void dp_altmode_work(struct work_struct *work)
 213 {
 214         struct dp_altmode *dp = container_of(work, struct dp_altmode, work);
 215         int svdm_version;
 216         u32 header;
 217         u32 vdo;
 218         int ret;
 219
 220         mutex_lock(&dp->lock);
 221
 222         switch (dp->state) {
 223         case DP_STATE_ENTER:
 224                 ret = typec_altmode_enter(dp->alt, NULL);
 225                 if (ret && ret != -EBUSY)
 226                         dev_err(&dp->alt->dev, "failed to enter mode\n");
 227                 break;
 228         case DP_STATE_UPDATE:
 229                 svdm_version = typec_altmode_get_svdm_version(dp->alt);
 230                 if (svdm_version < 0)
 231                         break;
 232                 header = DP_HEADER(dp, svdm_version, DP_CMD_STATUS_UPDATE);
 233                 vdo = 1;
 234                 ret = typec_altmode_vdm(dp->alt, header, &vdo, 2);
 235                 if (ret)
 236                         dev_err(&dp->alt->dev,
 237                                 "unable to send Status Update command (%d)\n",
 238                                 ret);
 239                 break;
 240         case DP_STATE_CONFIGURE:
 241                 ret = dp_altmode_configure_vdm(dp, dp->data.conf);
 242                 if (ret)
 243                         dev_err(&dp->alt->dev,
 244                                 "unable to send Configure command (%d)\n", ret);
 245                 break;
 246         case DP_STATE_EXIT:
 247                 if (typec_altmode_exit(dp->alt))
 248                         dev_err(&dp->alt->dev, "Exit Mode Failed!\n");
 249                 break;
 250         default:
 251                 break;
 252         }
 253
 254         dp->state = DP_STATE_IDLE;
 255
 256         mutex_unlock(&dp->lock);
 257 }
 258
 259 static void dp_altmode_attention(struct typec_altmode *alt, const u32 vdo)
 260 {
 261         struct dp_altmode *dp = typec_altmode_get_drvdata(alt);
 262         u8 old_state;
 263
 264         mutex_lock(&dp->lock);
 265
 266         old_state = dp->state;
 267         dp->data.status = vdo;
 268
 269         if (old_state != DP_STATE_IDLE)
 270                 dev_warn(&alt->dev, "ATTENTION while processing state %d\n",
 271                          old_state);
 272
 273         if (dp_altmode_status_update(dp))
 274                 dev_warn(&alt->dev, "%s: status update failed\n", __func__);
 275
 276         if (dp_altmode_notify(dp))
 277                 dev_err(&alt->dev, "%s: notification failed\n", __func__);
 278
 279         if (old_state == DP_STATE_IDLE && dp->state != DP_STATE_IDLE)
 280                 schedule_work(&dp->work);
 281
 282         mutex_unlock(&dp->lock);
 283 }
 284
 285 static int dp_altmode_vdm(struct typec_altmode *alt,
 286                           const u32 hdr, const u32 *vdo, int count)
 287 {
 288         struct dp_altmode *dp = typec_altmode_get_drvdata(alt);
 289         int cmd_type = PD_VDO_CMDT(hdr);
 290         int cmd = PD_VDO_CMD(hdr);
 291         int ret = 0;
 292
 293         mutex_lock(&dp->lock);
 294
 295         if (dp->state != DP_STATE_IDLE) {
 296                 ret = -EBUSY;
 297                 goto err_unlock;
 298         }
 299
 300         switch (cmd_type) {
 301         case CMDT_RSP_ACK:
 302                 switch (cmd) {
 303                 case CMD_ENTER_MODE:
 304                         typec_altmode_update_active(alt, true);
 305                         dp->state = DP_STATE_UPDATE;
 306                         break;
 307                 case CMD_EXIT_MODE:
 308                         typec_altmode_update_active(alt, false);
 309                         dp->data.status = 0;
 310                         dp->data.conf = 0;
 311                         if (dp->hpd) {
 312                                 drm_connector_oob_hotplug_event(dp->connector_fwnode,
 313                                                                 connector_status_disconnected);
 314                                 dp->hpd = false;
 315                                 sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd");
 316                         }
 317                         break;
 318                 case DP_CMD_STATUS_UPDATE:
 319                         dp->data.status = *vdo;
 320                         ret = dp_altmode_status_update(dp);
 321                         break;
 322                 case DP_CMD_CONFIGURE:
 323                         ret = dp_altmode_configured(dp);
 324                         break;
 325                 default:
 326                         break;
 327                 }
 328                 break;
 329         case CMDT_RSP_NAK:
 330                 switch (cmd) {
 331                 case DP_CMD_CONFIGURE:
 332                         dp->data.conf = 0;
 333                         ret = dp_altmode_configured(dp);
 334                         break;
 335                 default:
 336                         break;
 337                 }
 338                 break;
 339         default:
 340                 break;
 341         }
 342
 343         if (dp->state != DP_STATE_IDLE)
 344                 schedule_work(&dp->work);
 345
 346 err_unlock:
 347         mutex_unlock(&dp->lock);
 348         return ret;
 349 }
 350
 351 static int dp_altmode_activate(struct typec_altmode *alt, int activate)
 352 {
 353         return activate ? typec_altmode_enter(alt, NULL) :
 354                           typec_altmode_exit(alt);
 355 }
 356
 357 static const struct typec_altmode_ops dp_altmode_ops = {
 358         .attention = dp_altmode_attention,
 359         .vdm = dp_altmode_vdm,
 360         .activate = dp_altmode_activate,
 361 };
 362
 363 static const char * const configurations[] = {
 364         [DP_CONF_USB]   = "USB",
 365         [DP_CONF_DFP_D] = "source",
 366         [DP_CONF_UFP_D] = "sink",
 367 };
 368
 369 static ssize_t
 370 configuration_store(struct device *dev, struct device_attribute *attr,
 371                     const char *buf, size_t size)
 372 {
 373         struct dp_altmode *dp = dev_get_drvdata(dev);
 374         u32 conf;
 375         u32 cap;
 376         int con;
 377         int ret = 0;
 378
 379         con = sysfs_match_string(configurations, buf);
 380         if (con < 0)
 381                 return con;
 382
 383         mutex_lock(&dp->lock);
 384
 385         if (dp->state != DP_STATE_IDLE) {
 386                 ret = -EBUSY;
 387                 goto err_unlock;
 388         }
 389
 390         cap = DP_CAP_CAPABILITY(dp->alt->vdo);
 391
 392         if ((con == DP_CONF_DFP_D && !(cap & DP_CAP_DFP_D)) ||
 393             (con == DP_CONF_UFP_D && !(cap & DP_CAP_UFP_D))) {
 394                 ret = -EINVAL;
 395                 goto err_unlock;
 396         }
 397
 398         conf = dp->data.conf & ~DP_CONF_DUAL_D;
 399         conf |= con;
 400
 401         if (dp->alt->active) {
 402                 ret = dp_altmode_configure_vdm(dp, conf);
 403                 if (ret)
 404                         goto err_unlock;
 405         }
 406
 407         dp->data.conf = conf;
 408
 409 err_unlock:
 410         mutex_unlock(&dp->lock);
 411
 412         return ret ? ret : size;
 413 }
 414
 415 static ssize_t configuration_show(struct device *dev,
 416                                   struct device_attribute *attr, char *buf)
 417 {
 418         struct dp_altmode *dp = dev_get_drvdata(dev);
 419         int len;
 420         u8 cap;
 421         u8 cur;
 422         int i;
 423
 424         mutex_lock(&dp->lock);
 425
 426         cap = DP_CAP_CAPABILITY(dp->alt->vdo);
 427         cur = DP_CONF_CURRENTLY(dp->data.conf);
 428
 429         len = sprintf(buf, "%s ", cur ? "USB" : "[USB]");
 430
 431         for (i = 1; i < ARRAY_SIZE(configurations); i++) {
 432                 if (i == cur)
 433                         len += sprintf(buf + len, "[%s] ", configurations[i]);
 434                 else if ((i == DP_CONF_DFP_D && cap & DP_CAP_DFP_D) ||
 435                          (i == DP_CONF_UFP_D && cap & DP_CAP_UFP_D))
 436                         len += sprintf(buf + len, "%s ", configurations[i]);
 437         }
 438
 439         mutex_unlock(&dp->lock);
 440
 441         buf[len - 1] = '\n';
 442         return len;
 443 }
 444 static DEVICE_ATTR_RW(configuration);
 445
 446 static const char * const pin_assignments[] = {
 447         [DP_PIN_ASSIGN_A] = "A",
 448         [DP_PIN_ASSIGN_B] = "B",
 449         [DP_PIN_ASSIGN_C] = "C",
 450         [DP_PIN_ASSIGN_D] = "D",
 451         [DP_PIN_ASSIGN_E] = "E",
 452         [DP_PIN_ASSIGN_F] = "F",
 453 };
 454
 455 /*
 456  * Helper function to extract a peripheral's currently supported
 457  * Pin Assignments from its DisplayPort alternate mode state.
 458  */
 459 static u8 get_current_pin_assignments(struct dp_altmode *dp)
 460 {
 461         if (DP_CONF_CURRENTLY(dp->data.conf) == DP_CONF_UFP_U_AS_DFP_D)
 462                 return DP_CAP_PIN_ASSIGN_DFP_D(dp->alt->vdo);
 463         else
 464                 return DP_CAP_PIN_ASSIGN_UFP_D(dp->alt->vdo);
 465 }
 466
 467 static ssize_t
 468 pin_assignment_store(struct device *dev, struct device_attribute *attr,
 469                      const char *buf, size_t size)
 470 {
 471         struct dp_altmode *dp = dev_get_drvdata(dev);
 472         u8 assignments;
 473         u32 conf;
 474         int ret;
 475
 476         ret = sysfs_match_string(pin_assignments, buf);
 477         if (ret < 0)
 478                 return ret;
 479
 480         conf = DP_CONF_SET_PIN_ASSIGN(BIT(ret));
 481         ret = 0;
 482
 483         mutex_lock(&dp->lock);
 484
 485         if (conf & dp->data.conf)
 486                 goto out_unlock;
 487
 488         if (dp->state != DP_STATE_IDLE) {
 489                 ret = -EBUSY;
 490                 goto out_unlock;
 491         }
 492
 493         assignments = get_current_pin_assignments(dp);
 494
 495         if (!(DP_CONF_GET_PIN_ASSIGN(conf) & assignments)) {
 496                 ret = -EINVAL;
 497                 goto out_unlock;
 498         }
 499
 500         conf |= dp->data.conf & ~DP_CONF_PIN_ASSIGNEMENT_MASK;
 501
 502         /* Only send Configure command if a configuration has been set */
 503         if (dp->alt->active && DP_CONF_CURRENTLY(dp->data.conf)) {
 504                 ret = dp_altmode_configure_vdm(dp, conf);
 505                 if (ret)
 506                         goto out_unlock;
 507         }
 508
 509         dp->data.conf = conf;
 510
 511 out_unlock:
 512         mutex_unlock(&dp->lock);
 513
 514         return ret ? ret : size;
 515 }
 516
 517 static ssize_t pin_assignment_show(struct device *dev,
 518                                    struct device_attribute *attr, char *buf)
 519 {
 520         struct dp_altmode *dp = dev_get_drvdata(dev);
 521         u8 assignments;
 522         int len = 0;
 523         u8 cur;
 524         int i;
 525
 526         mutex_lock(&dp->lock);
 527
 528         cur = get_count_order(DP_CONF_GET_PIN_ASSIGN(dp->data.conf));
 529
 530         assignments = get_current_pin_assignments(dp);
 531
 532         for (i = 0; assignments; assignments >>= 1, i++) {
 533                 if (assignments & 1) {
 534                         if (i == cur)
 535                                 len += sprintf(buf + len, "[%s] ",
 536                                                pin_assignments[i]);
 537                         else
 538                                 len += sprintf(buf + len, "%s ",
 539                                                pin_assignments[i]);
 540                 }
 541         }
 542
 543         mutex_unlock(&dp->lock);
 544
 545         /* get_current_pin_assignments can return 0 when no matching pin assignments are found */
 546         if (len == 0)
 547                 len++;
 548
 549         buf[len - 1] = '\n';
 550         return len;
 551 }
 552 static DEVICE_ATTR_RW(pin_assignment);
 553
 554 static ssize_t hpd_show(struct device *dev, struct device_attribute *attr, char *buf)
 555 {
 556         struct dp_altmode *dp = dev_get_drvdata(dev);
 557
 558         return sysfs_emit(buf, "%d\n", dp->hpd);
 559 }
 560 static DEVICE_ATTR_RO(hpd);
 561
 562 static struct attribute *displayport_attrs[] = {
 563         &dev_attr_configuration.attr,
 564         &dev_attr_pin_assignment.attr,
 565         &dev_attr_hpd.attr,
 566         NULL
 567 };
 568
 569 static const struct attribute_group displayport_group = {
 570         .name = "displayport",
 571         .attrs = displayport_attrs,
 572 };
 573
 574 static const struct attribute_group *displayport_groups[] = {
 575         &displayport_group,
 576         NULL,
 577 };
 578
 579 int dp_altmode_probe(struct typec_altmode *alt)
 580 {
 581         const struct typec_altmode *port = typec_altmode_get_partner(alt);
 582         struct fwnode_handle *fwnode;
 583         struct dp_altmode *dp;
 584
 585         /* FIXME: Port can only be DFP_U. */
 586
 587         /* Make sure we have compatiple pin configurations */
 588         if (!(DP_CAP_PIN_ASSIGN_DFP_D(port->vdo) &
 589               DP_CAP_PIN_ASSIGN_UFP_D(alt->vdo)) &&
 590             !(DP_CAP_PIN_ASSIGN_UFP_D(port->vdo) &
 591               DP_CAP_PIN_ASSIGN_DFP_D(alt->vdo)))
 592                 return -ENODEV;
 593
 594         dp = devm_kzalloc(&alt->dev, sizeof(*dp), GFP_KERNEL);
 595         if (!dp)
 596                 return -ENOMEM;
 597
 598         INIT_WORK(&dp->work, dp_altmode_work);
 599         mutex_init(&dp->lock);
 600         dp->port = port;
 601         dp->alt = alt;
 602
 603         alt->desc = "DisplayPort";
 604         alt->ops = &dp_altmode_ops;
 605
 606         fwnode = dev_fwnode(alt->dev.parent->parent); /* typec_port fwnode */
 607         if (fwnode_property_present(fwnode, "displayport"))
 608                 dp->connector_fwnode = fwnode_find_reference(fwnode, "displayport", 0);
 609         else
 610                 dp->connector_fwnode = fwnode_handle_get(fwnode); /* embedded DP */
 611         if (IS_ERR(dp->connector_fwnode))
 612                 dp->connector_fwnode = NULL;
 613
 614         typec_altmode_set_drvdata(alt, dp);
 615
 616         dp->state = DP_STATE_ENTER;
 617         schedule_work(&dp->work);
 618
 619         return 0;
 620 }
 621 EXPORT_SYMBOL_GPL(dp_altmode_probe);
 622
 623 void dp_altmode_remove(struct typec_altmode *alt)
 624 {
 625         struct dp_altmode *dp = typec_altmode_get_drvdata(alt);
 626
 627         cancel_work_sync(&dp->work);
 628
 629         if (dp->connector_fwnode) {
 630                 drm_connector_oob_hotplug_event(dp->connector_fwnode,
 631                                                 connector_status_disconnected);
 632
 633                 fwnode_handle_put(dp->connector_fwnode);
 634         }
 635 }
 636 EXPORT_SYMBOL_GPL(dp_altmode_remove);
 637
 638 static const struct typec_device_id dp_typec_id[] = {
 639         { USB_TYPEC_DP_SID, USB_TYPEC_DP_MODE },
 640         { },
 641 };
 642 MODULE_DEVICE_TABLE(typec, dp_typec_id);
 643
 644 static struct typec_altmode_driver dp_altmode_driver = {
 645         .id_table = dp_typec_id,
 646         .probe = dp_altmode_probe,
 647         .remove = dp_altmode_remove,
 648         .driver = {
 649                 .name = "typec_displayport",
 650                 .owner = THIS_MODULE,
 651                 .dev_groups = displayport_groups,
 652         },
 653 };
 654 module_typec_altmode_driver(dp_altmode_driver);
 655
 656 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
 657 MODULE_LICENSE("GPL v2");
 658 MODULE_DESCRIPTION("DisplayPort Alternate Mode");