drivers/staging/greybus/svc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * SVC Greybus driver.
   4  *
   5  * Copyright 2015 Google Inc.
   6  * Copyright 2015 Linaro Ltd.
   7  */
   8
   9 #include <linux/debugfs.h>
  10 #include <linux/workqueue.h>
  11
  12 #include "greybus.h"
  13
  14 #define SVC_INTF_EJECT_TIMEOUT          9000
  15 #define SVC_INTF_ACTIVATE_TIMEOUT       6000
  16 #define SVC_INTF_RESUME_TIMEOUT         3000
  17
  18 struct gb_svc_deferred_request {
  19         struct work_struct work;
  20         struct gb_operation *operation;
  21 };
  22
  23 static int gb_svc_queue_deferred_request(struct gb_operation *operation);
  24
  25 static ssize_t endo_id_show(struct device *dev,
  26                             struct device_attribute *attr, char *buf)
  27 {
  28         struct gb_svc *svc = to_gb_svc(dev);
  29
  30         return sprintf(buf, "0x%04x\n", svc->endo_id);
  31 }
  32 static DEVICE_ATTR_RO(endo_id);
  33
  34 static ssize_t ap_intf_id_show(struct device *dev,
  35                                struct device_attribute *attr, char *buf)
  36 {
  37         struct gb_svc *svc = to_gb_svc(dev);
  38
  39         return sprintf(buf, "%u\n", svc->ap_intf_id);
  40 }
  41 static DEVICE_ATTR_RO(ap_intf_id);
  42
  43 // FIXME
  44 // This is a hack, we need to do this "right" and clean the interface up
  45 // properly, not just forcibly yank the thing out of the system and hope for the
  46 // best.  But for now, people want their modules to come out without having to
  47 // throw the thing to the ground or get out a screwdriver.
  48 static ssize_t intf_eject_store(struct device *dev,
  49                                 struct device_attribute *attr, const char *buf,
  50                                 size_t len)
  51 {
  52         struct gb_svc *svc = to_gb_svc(dev);
  53         unsigned short intf_id;
  54         int ret;
  55
  56         ret = kstrtou16(buf, 10, &intf_id);
  57         if (ret < 0)
  58                 return ret;
  59
  60         dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
  61
  62         ret = gb_svc_intf_eject(svc, intf_id);
  63         if (ret < 0)
  64                 return ret;
  65
  66         return len;
  67 }
  68 static DEVICE_ATTR_WO(intf_eject);
  69
  70 static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr,
  71                              char *buf)
  72 {
  73         struct gb_svc *svc = to_gb_svc(dev);
  74
  75         return sprintf(buf, "%s\n",
  76                        gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled");
  77 }
  78
  79 static ssize_t watchdog_store(struct device *dev,
  80                               struct device_attribute *attr, const char *buf,
  81                               size_t len)
  82 {
  83         struct gb_svc *svc = to_gb_svc(dev);
  84         int retval;
  85         bool user_request;
  86
  87         retval = strtobool(buf, &user_request);
  88         if (retval)
  89                 return retval;
  90
  91         if (user_request)
  92                 retval = gb_svc_watchdog_enable(svc);
  93         else
  94                 retval = gb_svc_watchdog_disable(svc);
  95         if (retval)
  96                 return retval;
  97         return len;
  98 }
  99 static DEVICE_ATTR_RW(watchdog);
 100
 101 static ssize_t watchdog_action_show(struct device *dev,
 102                                     struct device_attribute *attr, char *buf)
 103 {
 104         struct gb_svc *svc = to_gb_svc(dev);
 105
 106         if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL)
 107                 return sprintf(buf, "panic\n");
 108         else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO)
 109                 return sprintf(buf, "reset\n");
 110
 111         return -EINVAL;
 112 }
 113
 114 static ssize_t watchdog_action_store(struct device *dev,
 115                                      struct device_attribute *attr,
 116                                      const char *buf, size_t len)
 117 {
 118         struct gb_svc *svc = to_gb_svc(dev);
 119
 120         if (sysfs_streq(buf, "panic"))
 121                 svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL;
 122         else if (sysfs_streq(buf, "reset"))
 123                 svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO;
 124         else
 125                 return -EINVAL;
 126
 127         return len;
 128 }
 129 static DEVICE_ATTR_RW(watchdog_action);
 130
 131 static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value)
 132 {
 133         struct gb_svc_pwrmon_rail_count_get_response response;
 134         int ret;
 135
 136         ret = gb_operation_sync(svc->connection,
 137                                 GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0,
 138                                 &response, sizeof(response));
 139         if (ret) {
 140                 dev_err(&svc->dev, "failed to get rail count: %d\n", ret);
 141                 return ret;
 142         }
 143
 144         *value = response.rail_count;
 145
 146         return 0;
 147 }
 148
 149 static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc,
 150                 struct gb_svc_pwrmon_rail_names_get_response *response,
 151                 size_t bufsize)
 152 {
 153         int ret;
 154
 155         ret = gb_operation_sync(svc->connection,
 156                                 GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0,
 157                                 response, bufsize);
 158         if (ret) {
 159                 dev_err(&svc->dev, "failed to get rail names: %d\n", ret);
 160                 return ret;
 161         }
 162
 163         if (response->status != GB_SVC_OP_SUCCESS) {
 164                 dev_err(&svc->dev,
 165                         "SVC error while getting rail names: %u\n",
 166                         response->status);
 167                 return -EREMOTEIO;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id,
 174                                     u8 measurement_type, u32 *value)
 175 {
 176         struct gb_svc_pwrmon_sample_get_request request;
 177         struct gb_svc_pwrmon_sample_get_response response;
 178         int ret;
 179
 180         request.rail_id = rail_id;
 181         request.measurement_type = measurement_type;
 182
 183         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET,
 184                                 &request, sizeof(request),
 185                                 &response, sizeof(response));
 186         if (ret) {
 187                 dev_err(&svc->dev, "failed to get rail sample: %d\n", ret);
 188                 return ret;
 189         }
 190
 191         if (response.result) {
 192                 dev_err(&svc->dev,
 193                         "UniPro error while getting rail power sample (%d %d): %d\n",
 194                         rail_id, measurement_type, response.result);
 195                 switch (response.result) {
 196                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 197                         return -EINVAL;
 198                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 199                         return -ENOMSG;
 200                 default:
 201                         return -EREMOTEIO;
 202                 }
 203         }
 204
 205         *value = le32_to_cpu(response.measurement);
 206
 207         return 0;
 208 }
 209
 210 int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
 211                                   u8 measurement_type, u32 *value)
 212 {
 213         struct gb_svc_pwrmon_intf_sample_get_request request;
 214         struct gb_svc_pwrmon_intf_sample_get_response response;
 215         int ret;
 216
 217         request.intf_id = intf_id;
 218         request.measurement_type = measurement_type;
 219
 220         ret = gb_operation_sync(svc->connection,
 221                                 GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET,
 222                                 &request, sizeof(request),
 223                                 &response, sizeof(response));
 224         if (ret) {
 225                 dev_err(&svc->dev, "failed to get intf sample: %d\n", ret);
 226                 return ret;
 227         }
 228
 229         if (response.result) {
 230                 dev_err(&svc->dev,
 231                         "UniPro error while getting intf power sample (%d %d): %d\n",
 232                         intf_id, measurement_type, response.result);
 233                 switch (response.result) {
 234                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 235                         return -EINVAL;
 236                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 237                         return -ENOMSG;
 238                 default:
 239                         return -EREMOTEIO;
 240                 }
 241         }
 242
 243         *value = le32_to_cpu(response.measurement);
 244
 245         return 0;
 246 }
 247
 248 static struct attribute *svc_attrs[] = {
 249         &dev_attr_endo_id.attr,
 250         &dev_attr_ap_intf_id.attr,
 251         &dev_attr_intf_eject.attr,
 252         &dev_attr_watchdog.attr,
 253         &dev_attr_watchdog_action.attr,
 254         NULL,
 255 };
 256 ATTRIBUTE_GROUPS(svc);
 257
 258 int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
 259 {
 260         struct gb_svc_intf_device_id_request request;
 261
 262         request.intf_id = intf_id;
 263         request.device_id = device_id;
 264
 265         return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
 266                                  &request, sizeof(request), NULL, 0);
 267 }
 268
 269 int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
 270 {
 271         struct gb_svc_intf_eject_request request;
 272         int ret;
 273
 274         request.intf_id = intf_id;
 275
 276         /*
 277          * The pulse width for module release in svc is long so we need to
 278          * increase the timeout so the operation will not return to soon.
 279          */
 280         ret = gb_operation_sync_timeout(svc->connection,
 281                                         GB_SVC_TYPE_INTF_EJECT, &request,
 282                                         sizeof(request), NULL, 0,
 283                                         SVC_INTF_EJECT_TIMEOUT);
 284         if (ret) {
 285                 dev_err(&svc->dev, "failed to eject interface %u\n", intf_id);
 286                 return ret;
 287         }
 288
 289         return 0;
 290 }
 291
 292 int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable)
 293 {
 294         struct gb_svc_intf_vsys_request request;
 295         struct gb_svc_intf_vsys_response response;
 296         int type, ret;
 297
 298         request.intf_id = intf_id;
 299
 300         if (enable)
 301                 type = GB_SVC_TYPE_INTF_VSYS_ENABLE;
 302         else
 303                 type = GB_SVC_TYPE_INTF_VSYS_DISABLE;
 304
 305         ret = gb_operation_sync(svc->connection, type,
 306                                 &request, sizeof(request),
 307                                 &response, sizeof(response));
 308         if (ret < 0)
 309                 return ret;
 310         if (response.result_code != GB_SVC_INTF_VSYS_OK)
 311                 return -EREMOTEIO;
 312         return 0;
 313 }
 314
 315 int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable)
 316 {
 317         struct gb_svc_intf_refclk_request request;
 318         struct gb_svc_intf_refclk_response response;
 319         int type, ret;
 320
 321         request.intf_id = intf_id;
 322
 323         if (enable)
 324                 type = GB_SVC_TYPE_INTF_REFCLK_ENABLE;
 325         else
 326                 type = GB_SVC_TYPE_INTF_REFCLK_DISABLE;
 327
 328         ret = gb_operation_sync(svc->connection, type,
 329                                 &request, sizeof(request),
 330                                 &response, sizeof(response));
 331         if (ret < 0)
 332                 return ret;
 333         if (response.result_code != GB_SVC_INTF_REFCLK_OK)
 334                 return -EREMOTEIO;
 335         return 0;
 336 }
 337
 338 int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
 339 {
 340         struct gb_svc_intf_unipro_request request;
 341         struct gb_svc_intf_unipro_response response;
 342         int type, ret;
 343
 344         request.intf_id = intf_id;
 345
 346         if (enable)
 347                 type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE;
 348         else
 349                 type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE;
 350
 351         ret = gb_operation_sync(svc->connection, type,
 352                                 &request, sizeof(request),
 353                                 &response, sizeof(response));
 354         if (ret < 0)
 355                 return ret;
 356         if (response.result_code != GB_SVC_INTF_UNIPRO_OK)
 357                 return -EREMOTEIO;
 358         return 0;
 359 }
 360
 361 int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
 362 {
 363         struct gb_svc_intf_activate_request request;
 364         struct gb_svc_intf_activate_response response;
 365         int ret;
 366
 367         request.intf_id = intf_id;
 368
 369         ret = gb_operation_sync_timeout(svc->connection,
 370                                         GB_SVC_TYPE_INTF_ACTIVATE,
 371                                         &request, sizeof(request),
 372                                         &response, sizeof(response),
 373                                         SVC_INTF_ACTIVATE_TIMEOUT);
 374         if (ret < 0)
 375                 return ret;
 376         if (response.status != GB_SVC_OP_SUCCESS) {
 377                 dev_err(&svc->dev, "failed to activate interface %u: %u\n",
 378                         intf_id, response.status);
 379                 return -EREMOTEIO;
 380         }
 381
 382         *intf_type = response.intf_type;
 383
 384         return 0;
 385 }
 386
 387 int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id)
 388 {
 389         struct gb_svc_intf_resume_request request;
 390         struct gb_svc_intf_resume_response response;
 391         int ret;
 392
 393         request.intf_id = intf_id;
 394
 395         ret = gb_operation_sync_timeout(svc->connection,
 396                                         GB_SVC_TYPE_INTF_RESUME,
 397                                         &request, sizeof(request),
 398                                         &response, sizeof(response),
 399                                         SVC_INTF_RESUME_TIMEOUT);
 400         if (ret < 0) {
 401                 dev_err(&svc->dev, "failed to send interface resume %u: %d\n",
 402                         intf_id, ret);
 403                 return ret;
 404         }
 405
 406         if (response.status != GB_SVC_OP_SUCCESS) {
 407                 dev_err(&svc->dev, "failed to resume interface %u: %u\n",
 408                         intf_id, response.status);
 409                 return -EREMOTEIO;
 410         }
 411
 412         return 0;
 413 }
 414
 415 int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 416                         u32 *value)
 417 {
 418         struct gb_svc_dme_peer_get_request request;
 419         struct gb_svc_dme_peer_get_response response;
 420         u16 result;
 421         int ret;
 422
 423         request.intf_id = intf_id;
 424         request.attr = cpu_to_le16(attr);
 425         request.selector = cpu_to_le16(selector);
 426
 427         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
 428                                 &request, sizeof(request),
 429                                 &response, sizeof(response));
 430         if (ret) {
 431                 dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n",
 432                         intf_id, attr, selector, ret);
 433                 return ret;
 434         }
 435
 436         result = le16_to_cpu(response.result_code);
 437         if (result) {
 438                 dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n",
 439                         intf_id, attr, selector, result);
 440                 return -EREMOTEIO;
 441         }
 442
 443         if (value)
 444                 *value = le32_to_cpu(response.attr_value);
 445
 446         return 0;
 447 }
 448
 449 int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 450                         u32 value)
 451 {
 452         struct gb_svc_dme_peer_set_request request;
 453         struct gb_svc_dme_peer_set_response response;
 454         u16 result;
 455         int ret;
 456
 457         request.intf_id = intf_id;
 458         request.attr = cpu_to_le16(attr);
 459         request.selector = cpu_to_le16(selector);
 460         request.value = cpu_to_le32(value);
 461
 462         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
 463                                 &request, sizeof(request),
 464                                 &response, sizeof(response));
 465         if (ret) {
 466                 dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n",
 467                         intf_id, attr, selector, value, ret);
 468                 return ret;
 469         }
 470
 471         result = le16_to_cpu(response.result_code);
 472         if (result) {
 473                 dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n",
 474                         intf_id, attr, selector, value, result);
 475                 return -EREMOTEIO;
 476         }
 477
 478         return 0;
 479 }
 480
 481 int gb_svc_connection_create(struct gb_svc *svc,
 482                              u8 intf1_id, u16 cport1_id,
 483                              u8 intf2_id, u16 cport2_id,
 484                              u8 cport_flags)
 485 {
 486         struct gb_svc_conn_create_request request;
 487
 488         request.intf1_id = intf1_id;
 489         request.cport1_id = cpu_to_le16(cport1_id);
 490         request.intf2_id = intf2_id;
 491         request.cport2_id = cpu_to_le16(cport2_id);
 492         request.tc = 0;         /* TC0 */
 493         request.flags = cport_flags;
 494
 495         return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
 496                                  &request, sizeof(request), NULL, 0);
 497 }
 498
 499 void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
 500                                u8 intf2_id, u16 cport2_id)
 501 {
 502         struct gb_svc_conn_destroy_request request;
 503         struct gb_connection *connection = svc->connection;
 504         int ret;
 505
 506         request.intf1_id = intf1_id;
 507         request.cport1_id = cpu_to_le16(cport1_id);
 508         request.intf2_id = intf2_id;
 509         request.cport2_id = cpu_to_le16(cport2_id);
 510
 511         ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
 512                                 &request, sizeof(request), NULL, 0);
 513         if (ret) {
 514                 dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n",
 515                         intf1_id, cport1_id, intf2_id, cport2_id, ret);
 516         }
 517 }
 518
 519 /* Creates bi-directional routes between the devices */
 520 int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
 521                         u8 intf2_id, u8 dev2_id)
 522 {
 523         struct gb_svc_route_create_request request;
 524
 525         request.intf1_id = intf1_id;
 526         request.dev1_id = dev1_id;
 527         request.intf2_id = intf2_id;
 528         request.dev2_id = dev2_id;
 529
 530         return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
 531                                  &request, sizeof(request), NULL, 0);
 532 }
 533
 534 /* Destroys bi-directional routes between the devices */
 535 void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
 536 {
 537         struct gb_svc_route_destroy_request request;
 538         int ret;
 539
 540         request.intf1_id = intf1_id;
 541         request.intf2_id = intf2_id;
 542
 543         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
 544                                 &request, sizeof(request), NULL, 0);
 545         if (ret) {
 546                 dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
 547                         intf1_id, intf2_id, ret);
 548         }
 549 }
 550
 551 int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
 552                                u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
 553                                u8 tx_amplitude, u8 tx_hs_equalizer,
 554                                u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
 555                                u8 flags, u32 quirks,
 556                                struct gb_svc_l2_timer_cfg *local,
 557                                struct gb_svc_l2_timer_cfg *remote)
 558 {
 559         struct gb_svc_intf_set_pwrm_request request;
 560         struct gb_svc_intf_set_pwrm_response response;
 561         int ret;
 562         u16 result_code;
 563
 564         memset(&request, 0, sizeof(request));
 565
 566         request.intf_id = intf_id;
 567         request.hs_series = hs_series;
 568         request.tx_mode = tx_mode;
 569         request.tx_gear = tx_gear;
 570         request.tx_nlanes = tx_nlanes;
 571         request.tx_amplitude = tx_amplitude;
 572         request.tx_hs_equalizer = tx_hs_equalizer;
 573         request.rx_mode = rx_mode;
 574         request.rx_gear = rx_gear;
 575         request.rx_nlanes = rx_nlanes;
 576         request.flags = flags;
 577         request.quirks = cpu_to_le32(quirks);
 578         if (local)
 579                 request.local_l2timerdata = *local;
 580         if (remote)
 581                 request.remote_l2timerdata = *remote;
 582
 583         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 584                                 &request, sizeof(request),
 585                                 &response, sizeof(response));
 586         if (ret < 0)
 587                 return ret;
 588
 589         result_code = response.result_code;
 590         if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) {
 591                 dev_err(&svc->dev, "set power mode = %d\n", result_code);
 592                 return -EIO;
 593         }
 594
 595         return 0;
 596 }
 597 EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
 598
 599 int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id)
 600 {
 601         struct gb_svc_intf_set_pwrm_request request;
 602         struct gb_svc_intf_set_pwrm_response response;
 603         int ret;
 604         u16 result_code;
 605
 606         memset(&request, 0, sizeof(request));
 607
 608         request.intf_id = intf_id;
 609         request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A;
 610         request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 611         request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 612
 613         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 614                                 &request, sizeof(request),
 615                                 &response, sizeof(response));
 616         if (ret < 0) {
 617                 dev_err(&svc->dev,
 618                         "failed to send set power mode operation to interface %u: %d\n",
 619                         intf_id, ret);
 620                 return ret;
 621         }
 622
 623         result_code = response.result_code;
 624         if (result_code != GB_SVC_SETPWRM_PWR_OK) {
 625                 dev_err(&svc->dev,
 626                         "failed to hibernate the link for interface %u: %u\n",
 627                         intf_id, result_code);
 628                 return -EIO;
 629         }
 630
 631         return 0;
 632 }
 633
 634 int gb_svc_ping(struct gb_svc *svc)
 635 {
 636         return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
 637                                          NULL, 0, NULL, 0,
 638                                          GB_OPERATION_TIMEOUT_DEFAULT * 2);
 639 }
 640
 641 static int gb_svc_version_request(struct gb_operation *op)
 642 {
 643         struct gb_connection *connection = op->connection;
 644         struct gb_svc *svc = gb_connection_get_data(connection);
 645         struct gb_svc_version_request *request;
 646         struct gb_svc_version_response *response;
 647
 648         if (op->request->payload_size < sizeof(*request)) {
 649                 dev_err(&svc->dev, "short version request (%zu < %zu)\n",
 650                         op->request->payload_size,
 651                         sizeof(*request));
 652                 return -EINVAL;
 653         }
 654
 655         request = op->request->payload;
 656
 657         if (request->major > GB_SVC_VERSION_MAJOR) {
 658                 dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
 659                          request->major, GB_SVC_VERSION_MAJOR);
 660                 return -ENOTSUPP;
 661         }
 662
 663         svc->protocol_major = request->major;
 664         svc->protocol_minor = request->minor;
 665
 666         if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
 667                 return -ENOMEM;
 668
 669         response = op->response->payload;
 670         response->major = svc->protocol_major;
 671         response->minor = svc->protocol_minor;
 672
 673         return 0;
 674 }
 675
 676 static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf,
 677                                         size_t len, loff_t *offset)
 678 {
 679         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 680                 file_inode(file)->i_private;
 681         struct gb_svc *svc = pwrmon_rails->svc;
 682         int ret, desc;
 683         u32 value;
 684         char buff[16];
 685
 686         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 687                                        GB_SVC_PWRMON_TYPE_VOL, &value);
 688         if (ret) {
 689                 dev_err(&svc->dev,
 690                         "failed to get voltage sample %u: %d\n",
 691                         pwrmon_rails->id, ret);
 692                 return ret;
 693         }
 694
 695         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 696
 697         return simple_read_from_buffer(buf, len, offset, buff, desc);
 698 }
 699
 700 static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf,
 701                                         size_t len, loff_t *offset)
 702 {
 703         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 704                 file_inode(file)->i_private;
 705         struct gb_svc *svc = pwrmon_rails->svc;
 706         int ret, desc;
 707         u32 value;
 708         char buff[16];
 709
 710         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 711                                        GB_SVC_PWRMON_TYPE_CURR, &value);
 712         if (ret) {
 713                 dev_err(&svc->dev,
 714                         "failed to get current sample %u: %d\n",
 715                         pwrmon_rails->id, ret);
 716                 return ret;
 717         }
 718
 719         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 720
 721         return simple_read_from_buffer(buf, len, offset, buff, desc);
 722 }
 723
 724 static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf,
 725                                       size_t len, loff_t *offset)
 726 {
 727         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 728                 file_inode(file)->i_private;
 729         struct gb_svc *svc = pwrmon_rails->svc;
 730         int ret, desc;
 731         u32 value;
 732         char buff[16];
 733
 734         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 735                                        GB_SVC_PWRMON_TYPE_PWR, &value);
 736         if (ret) {
 737                 dev_err(&svc->dev, "failed to get power sample %u: %d\n",
 738                         pwrmon_rails->id, ret);
 739                 return ret;
 740         }
 741
 742         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 743
 744         return simple_read_from_buffer(buf, len, offset, buff, desc);
 745 }
 746
 747 static const struct file_operations pwrmon_debugfs_voltage_fops = {
 748         .read           = pwr_debugfs_voltage_read,
 749 };
 750
 751 static const struct file_operations pwrmon_debugfs_current_fops = {
 752         .read           = pwr_debugfs_current_read,
 753 };
 754
 755 static const struct file_operations pwrmon_debugfs_power_fops = {
 756         .read           = pwr_debugfs_power_read,
 757 };
 758
 759 static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc)
 760 {
 761         int i;
 762         size_t bufsize;
 763         struct dentry *dent;
 764         struct gb_svc_pwrmon_rail_names_get_response *rail_names;
 765         u8 rail_count;
 766
 767         dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry);
 768         if (IS_ERR_OR_NULL(dent))
 769                 return;
 770
 771         if (gb_svc_pwrmon_rail_count_get(svc, &rail_count))
 772                 goto err_pwrmon_debugfs;
 773
 774         if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT)
 775                 goto err_pwrmon_debugfs;
 776
 777         bufsize = sizeof(*rail_names) +
 778                 GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count;
 779
 780         rail_names = kzalloc(bufsize, GFP_KERNEL);
 781         if (!rail_names)
 782                 goto err_pwrmon_debugfs;
 783
 784         svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails),
 785                                     GFP_KERNEL);
 786         if (!svc->pwrmon_rails)
 787                 goto err_pwrmon_debugfs_free;
 788
 789         if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize))
 790                 goto err_pwrmon_debugfs_free;
 791
 792         for (i = 0; i < rail_count; i++) {
 793                 struct dentry *dir;
 794                 struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i];
 795                 char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE];
 796
 797                 snprintf(fname, sizeof(fname), "%s",
 798                          (char *)&rail_names->name[i]);
 799
 800                 rail->id = i;
 801                 rail->svc = svc;
 802
 803                 dir = debugfs_create_dir(fname, dent);
 804                 debugfs_create_file("voltage_now", 0444, dir, rail,
 805                                     &pwrmon_debugfs_voltage_fops);
 806                 debugfs_create_file("current_now", 0444, dir, rail,
 807                                     &pwrmon_debugfs_current_fops);
 808                 debugfs_create_file("power_now", 0444, dir, rail,
 809                                     &pwrmon_debugfs_power_fops);
 810         }
 811
 812         kfree(rail_names);
 813         return;
 814
 815 err_pwrmon_debugfs_free:
 816         kfree(rail_names);
 817         kfree(svc->pwrmon_rails);
 818         svc->pwrmon_rails = NULL;
 819
 820 err_pwrmon_debugfs:
 821         debugfs_remove(dent);
 822 }
 823
 824 static void gb_svc_debugfs_init(struct gb_svc *svc)
 825 {
 826         svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev),
 827                                                  gb_debugfs_get());
 828         gb_svc_pwrmon_debugfs_init(svc);
 829 }
 830
 831 static void gb_svc_debugfs_exit(struct gb_svc *svc)
 832 {
 833         debugfs_remove_recursive(svc->debugfs_dentry);
 834         kfree(svc->pwrmon_rails);
 835         svc->pwrmon_rails = NULL;
 836 }
 837
 838 static int gb_svc_hello(struct gb_operation *op)
 839 {
 840         struct gb_connection *connection = op->connection;
 841         struct gb_svc *svc = gb_connection_get_data(connection);
 842         struct gb_svc_hello_request *hello_request;
 843         int ret;
 844
 845         if (op->request->payload_size < sizeof(*hello_request)) {
 846                 dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
 847                          op->request->payload_size,
 848                          sizeof(*hello_request));
 849                 return -EINVAL;
 850         }
 851
 852         hello_request = op->request->payload;
 853         svc->endo_id = le16_to_cpu(hello_request->endo_id);
 854         svc->ap_intf_id = hello_request->interface_id;
 855
 856         ret = device_add(&svc->dev);
 857         if (ret) {
 858                 dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
 859                 return ret;
 860         }
 861
 862         ret = gb_svc_watchdog_create(svc);
 863         if (ret) {
 864                 dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
 865                 goto err_unregister_device;
 866         }
 867
 868         gb_svc_debugfs_init(svc);
 869
 870         return gb_svc_queue_deferred_request(op);
 871
 872 err_unregister_device:
 873         gb_svc_watchdog_destroy(svc);
 874         device_del(&svc->dev);
 875         return ret;
 876 }
 877
 878 static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
 879                                                     u8 intf_id)
 880 {
 881         struct gb_host_device *hd = svc->hd;
 882         struct gb_module *module;
 883         size_t num_interfaces;
 884         u8 module_id;
 885
 886         list_for_each_entry(module, &hd->modules, hd_node) {
 887                 module_id = module->module_id;
 888                 num_interfaces = module->num_interfaces;
 889
 890                 if (intf_id >= module_id &&
 891                     intf_id < module_id + num_interfaces) {
 892                         return module->interfaces[intf_id - module_id];
 893                 }
 894         }
 895
 896         return NULL;
 897 }
 898
 899 static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
 900 {
 901         struct gb_host_device *hd = svc->hd;
 902         struct gb_module *module;
 903
 904         list_for_each_entry(module, &hd->modules, hd_node) {
 905                 if (module->module_id == module_id)
 906                         return module;
 907         }
 908
 909         return NULL;
 910 }
 911
 912 static void gb_svc_process_hello_deferred(struct gb_operation *operation)
 913 {
 914         struct gb_connection *connection = operation->connection;
 915         struct gb_svc *svc = gb_connection_get_data(connection);
 916         int ret;
 917
 918         /*
 919          * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch
 920          * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient
 921          * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged
 922          * module.
 923          *
 924          * The code should be removed once SW-2217, Heuristic for UniPro
 925          * Power Mode Changes is resolved.
 926          */
 927         ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
 928                                          GB_SVC_UNIPRO_HS_SERIES_A,
 929                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 930                                          2, 1,
 931                                          GB_SVC_SMALL_AMPLITUDE,
 932                                          GB_SVC_NO_DE_EMPHASIS,
 933                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 934                                          2, 1,
 935                                          0, 0,
 936                                          NULL, NULL);
 937
 938         if (ret)
 939                 dev_warn(&svc->dev,
 940                          "power mode change failed on AP to switch link: %d\n",
 941                          ret);
 942 }
 943
 944 static void gb_svc_process_module_inserted(struct gb_operation *operation)
 945 {
 946         struct gb_svc_module_inserted_request *request;
 947         struct gb_connection *connection = operation->connection;
 948         struct gb_svc *svc = gb_connection_get_data(connection);
 949         struct gb_host_device *hd = svc->hd;
 950         struct gb_module *module;
 951         size_t num_interfaces;
 952         u8 module_id;
 953         u16 flags;
 954         int ret;
 955
 956         /* The request message size has already been verified. */
 957         request = operation->request->payload;
 958         module_id = request->primary_intf_id;
 959         num_interfaces = request->intf_count;
 960         flags = le16_to_cpu(request->flags);
 961
 962         dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n",
 963                 __func__, module_id, num_interfaces, flags);
 964
 965         if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) {
 966                 dev_warn(&svc->dev, "no primary interface detected on module %u\n",
 967                          module_id);
 968         }
 969
 970         module = gb_svc_module_lookup(svc, module_id);
 971         if (module) {
 972                 dev_warn(&svc->dev, "unexpected module-inserted event %u\n",
 973                          module_id);
 974                 return;
 975         }
 976
 977         module = gb_module_create(hd, module_id, num_interfaces);
 978         if (!module) {
 979                 dev_err(&svc->dev, "failed to create module\n");
 980                 return;
 981         }
 982
 983         ret = gb_module_add(module);
 984         if (ret) {
 985                 gb_module_put(module);
 986                 return;
 987         }
 988
 989         list_add(&module->hd_node, &hd->modules);
 990 }
 991
 992 static void gb_svc_process_module_removed(struct gb_operation *operation)
 993 {
 994         struct gb_svc_module_removed_request *request;
 995         struct gb_connection *connection = operation->connection;
 996         struct gb_svc *svc = gb_connection_get_data(connection);
 997         struct gb_module *module;
 998         u8 module_id;
 999
1000         /* The request message size has already been verified. */
1001         request = operation->request->payload;
1002         module_id = request->primary_intf_id;
1003
1004         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id);
1005
1006         module = gb_svc_module_lookup(svc, module_id);
1007         if (!module) {
1008                 dev_warn(&svc->dev, "unexpected module-removed event %u\n",
1009                          module_id);
1010                 return;
1011         }
1012
1013         module->disconnected = true;
1014
1015         gb_module_del(module);
1016         list_del(&module->hd_node);
1017         gb_module_put(module);
1018 }
1019
1020 static void gb_svc_process_intf_oops(struct gb_operation *operation)
1021 {
1022         struct gb_svc_intf_oops_request *request;
1023         struct gb_connection *connection = operation->connection;
1024         struct gb_svc *svc = gb_connection_get_data(connection);
1025         struct gb_interface *intf;
1026         u8 intf_id;
1027         u8 reason;
1028
1029         /* The request message size has already been verified. */
1030         request = operation->request->payload;
1031         intf_id = request->intf_id;
1032         reason = request->reason;
1033
1034         intf = gb_svc_interface_lookup(svc, intf_id);
1035         if (!intf) {
1036                 dev_warn(&svc->dev, "unexpected interface-oops event %u\n",
1037                          intf_id);
1038                 return;
1039         }
1040
1041         dev_info(&svc->dev, "Deactivating interface %u, interface oops reason = %u\n",
1042                  intf_id, reason);
1043
1044         mutex_lock(&intf->mutex);
1045         intf->disconnected = true;
1046         gb_interface_disable(intf);
1047         gb_interface_deactivate(intf);
1048         mutex_unlock(&intf->mutex);
1049 }
1050
1051 static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
1052 {
1053         struct gb_svc_intf_mailbox_event_request *request;
1054         struct gb_connection *connection = operation->connection;
1055         struct gb_svc *svc = gb_connection_get_data(connection);
1056         struct gb_interface *intf;
1057         u8 intf_id;
1058         u16 result_code;
1059         u32 mailbox;
1060
1061         /* The request message size has already been verified. */
1062         request = operation->request->payload;
1063         intf_id = request->intf_id;
1064         result_code = le16_to_cpu(request->result_code);
1065         mailbox = le32_to_cpu(request->mailbox);
1066
1067         dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
1068                 __func__, intf_id, result_code, mailbox);
1069
1070         intf = gb_svc_interface_lookup(svc, intf_id);
1071         if (!intf) {
1072                 dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
1073                 return;
1074         }
1075
1076         gb_interface_mailbox_event(intf, result_code, mailbox);
1077 }
1078
1079 static void gb_svc_process_deferred_request(struct work_struct *work)
1080 {
1081         struct gb_svc_deferred_request *dr;
1082         struct gb_operation *operation;
1083         struct gb_svc *svc;
1084         u8 type;
1085
1086         dr = container_of(work, struct gb_svc_deferred_request, work);
1087         operation = dr->operation;
1088         svc = gb_connection_get_data(operation->connection);
1089         type = operation->request->header->type;
1090
1091         switch (type) {
1092         case GB_SVC_TYPE_SVC_HELLO:
1093                 gb_svc_process_hello_deferred(operation);
1094                 break;
1095         case GB_SVC_TYPE_MODULE_INSERTED:
1096                 gb_svc_process_module_inserted(operation);
1097                 break;
1098         case GB_SVC_TYPE_MODULE_REMOVED:
1099                 gb_svc_process_module_removed(operation);
1100                 break;
1101         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1102                 gb_svc_process_intf_mailbox_event(operation);
1103                 break;
1104         case GB_SVC_TYPE_INTF_OOPS:
1105                 gb_svc_process_intf_oops(operation);
1106                 break;
1107         default:
1108                 dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
1109         }
1110
1111         gb_operation_put(operation);
1112         kfree(dr);
1113 }
1114
1115 static int gb_svc_queue_deferred_request(struct gb_operation *operation)
1116 {
1117         struct gb_svc *svc = gb_connection_get_data(operation->connection);
1118         struct gb_svc_deferred_request *dr;
1119
1120         dr = kmalloc(sizeof(*dr), GFP_KERNEL);
1121         if (!dr)
1122                 return -ENOMEM;
1123
1124         gb_operation_get(operation);
1125
1126         dr->operation = operation;
1127         INIT_WORK(&dr->work, gb_svc_process_deferred_request);
1128
1129         queue_work(svc->wq, &dr->work);
1130
1131         return 0;
1132 }
1133
1134 static int gb_svc_intf_reset_recv(struct gb_operation *op)
1135 {
1136         struct gb_svc *svc = gb_connection_get_data(op->connection);
1137         struct gb_message *request = op->request;
1138         struct gb_svc_intf_reset_request *reset;
1139
1140         if (request->payload_size < sizeof(*reset)) {
1141                 dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
1142                          request->payload_size, sizeof(*reset));
1143                 return -EINVAL;
1144         }
1145         reset = request->payload;
1146
1147         /* FIXME Reset the interface here */
1148
1149         return 0;
1150 }
1151
1152 static int gb_svc_module_inserted_recv(struct gb_operation *op)
1153 {
1154         struct gb_svc *svc = gb_connection_get_data(op->connection);
1155         struct gb_svc_module_inserted_request *request;
1156
1157         if (op->request->payload_size < sizeof(*request)) {
1158                 dev_warn(&svc->dev, "short module-inserted request received (%zu < %zu)\n",
1159                          op->request->payload_size, sizeof(*request));
1160                 return -EINVAL;
1161         }
1162
1163         request = op->request->payload;
1164
1165         dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1166                 request->primary_intf_id);
1167
1168         return gb_svc_queue_deferred_request(op);
1169 }
1170
1171 static int gb_svc_module_removed_recv(struct gb_operation *op)
1172 {
1173         struct gb_svc *svc = gb_connection_get_data(op->connection);
1174         struct gb_svc_module_removed_request *request;
1175
1176         if (op->request->payload_size < sizeof(*request)) {
1177                 dev_warn(&svc->dev, "short module-removed request received (%zu < %zu)\n",
1178                          op->request->payload_size, sizeof(*request));
1179                 return -EINVAL;
1180         }
1181
1182         request = op->request->payload;
1183
1184         dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1185                 request->primary_intf_id);
1186
1187         return gb_svc_queue_deferred_request(op);
1188 }
1189
1190 static int gb_svc_intf_oops_recv(struct gb_operation *op)
1191 {
1192         struct gb_svc *svc = gb_connection_get_data(op->connection);
1193         struct gb_svc_intf_oops_request *request;
1194
1195         if (op->request->payload_size < sizeof(*request)) {
1196                 dev_warn(&svc->dev, "short intf-oops request received (%zu < %zu)\n",
1197                          op->request->payload_size, sizeof(*request));
1198                 return -EINVAL;
1199         }
1200
1201         return gb_svc_queue_deferred_request(op);
1202 }
1203
1204 static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op)
1205 {
1206         struct gb_svc *svc = gb_connection_get_data(op->connection);
1207         struct gb_svc_intf_mailbox_event_request *request;
1208
1209         if (op->request->payload_size < sizeof(*request)) {
1210                 dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n",
1211                          op->request->payload_size, sizeof(*request));
1212                 return -EINVAL;
1213         }
1214
1215         request = op->request->payload;
1216
1217         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
1218
1219         return gb_svc_queue_deferred_request(op);
1220 }
1221
1222 static int gb_svc_request_handler(struct gb_operation *op)
1223 {
1224         struct gb_connection *connection = op->connection;
1225         struct gb_svc *svc = gb_connection_get_data(connection);
1226         u8 type = op->type;
1227         int ret = 0;
1228
1229         /*
1230          * SVC requests need to follow a specific order (at least initially) and
1231          * below code takes care of enforcing that. The expected order is:
1232          * - PROTOCOL_VERSION
1233          * - SVC_HELLO
1234          * - Any other request, but the earlier two.
1235          *
1236          * Incoming requests are guaranteed to be serialized and so we don't
1237          * need to protect 'state' for any races.
1238          */
1239         switch (type) {
1240         case GB_SVC_TYPE_PROTOCOL_VERSION:
1241                 if (svc->state != GB_SVC_STATE_RESET)
1242                         ret = -EINVAL;
1243                 break;
1244         case GB_SVC_TYPE_SVC_HELLO:
1245                 if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
1246                         ret = -EINVAL;
1247                 break;
1248         default:
1249                 if (svc->state != GB_SVC_STATE_SVC_HELLO)
1250                         ret = -EINVAL;
1251                 break;
1252         }
1253
1254         if (ret) {
1255                 dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
1256                          type, svc->state);
1257                 return ret;
1258         }
1259
1260         switch (type) {
1261         case GB_SVC_TYPE_PROTOCOL_VERSION:
1262                 ret = gb_svc_version_request(op);
1263                 if (!ret)
1264                         svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
1265                 return ret;
1266         case GB_SVC_TYPE_SVC_HELLO:
1267                 ret = gb_svc_hello(op);
1268                 if (!ret)
1269                         svc->state = GB_SVC_STATE_SVC_HELLO;
1270                 return ret;
1271         case GB_SVC_TYPE_INTF_RESET:
1272                 return gb_svc_intf_reset_recv(op);
1273         case GB_SVC_TYPE_MODULE_INSERTED:
1274                 return gb_svc_module_inserted_recv(op);
1275         case GB_SVC_TYPE_MODULE_REMOVED:
1276                 return gb_svc_module_removed_recv(op);
1277         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1278                 return gb_svc_intf_mailbox_event_recv(op);
1279         case GB_SVC_TYPE_INTF_OOPS:
1280                 return gb_svc_intf_oops_recv(op);
1281         default:
1282                 dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
1283                 return -EINVAL;
1284         }
1285 }
1286
1287 static void gb_svc_release(struct device *dev)
1288 {
1289         struct gb_svc *svc = to_gb_svc(dev);
1290
1291         if (svc->connection)
1292                 gb_connection_destroy(svc->connection);
1293         ida_destroy(&svc->device_id_map);
1294         destroy_workqueue(svc->wq);
1295         kfree(svc);
1296 }
1297
1298 struct device_type greybus_svc_type = {
1299         .name           = "greybus_svc",
1300         .release        = gb_svc_release,
1301 };
1302
1303 struct gb_svc *gb_svc_create(struct gb_host_device *hd)
1304 {
1305         struct gb_svc *svc;
1306
1307         svc = kzalloc(sizeof(*svc), GFP_KERNEL);
1308         if (!svc)
1309                 return NULL;
1310
1311         svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev));
1312         if (!svc->wq) {
1313                 kfree(svc);
1314                 return NULL;
1315         }
1316
1317         svc->dev.parent = &hd->dev;
1318         svc->dev.bus = &greybus_bus_type;
1319         svc->dev.type = &greybus_svc_type;
1320         svc->dev.groups = svc_groups;
1321         svc->dev.dma_mask = svc->dev.parent->dma_mask;
1322         device_initialize(&svc->dev);
1323
1324         dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
1325
1326         ida_init(&svc->device_id_map);
1327         svc->state = GB_SVC_STATE_RESET;
1328         svc->hd = hd;
1329
1330         svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
1331                                                       gb_svc_request_handler);
1332         if (IS_ERR(svc->connection)) {
1333                 dev_err(&svc->dev, "failed to create connection: %ld\n",
1334                         PTR_ERR(svc->connection));
1335                 goto err_put_device;
1336         }
1337
1338         gb_connection_set_data(svc->connection, svc);
1339
1340         return svc;
1341
1342 err_put_device:
1343         put_device(&svc->dev);
1344         return NULL;
1345 }
1346
1347 int gb_svc_add(struct gb_svc *svc)
1348 {
1349         int ret;
1350
1351         /*
1352          * The SVC protocol is currently driven by the SVC, so the SVC device
1353          * is added from the connection request handler when enough
1354          * information has been received.
1355          */
1356         ret = gb_connection_enable(svc->connection);
1357         if (ret)
1358                 return ret;
1359
1360         return 0;
1361 }
1362
1363 static void gb_svc_remove_modules(struct gb_svc *svc)
1364 {
1365         struct gb_host_device *hd = svc->hd;
1366         struct gb_module *module, *tmp;
1367
1368         list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) {
1369                 gb_module_del(module);
1370                 list_del(&module->hd_node);
1371                 gb_module_put(module);
1372         }
1373 }
1374
1375 void gb_svc_del(struct gb_svc *svc)
1376 {
1377         gb_connection_disable_rx(svc->connection);
1378
1379         /*
1380          * The SVC device may have been registered from the request handler.
1381          */
1382         if (device_is_registered(&svc->dev)) {
1383                 gb_svc_debugfs_exit(svc);
1384                 gb_svc_watchdog_destroy(svc);
1385                 device_del(&svc->dev);
1386         }
1387
1388         flush_workqueue(svc->wq);
1389
1390         gb_svc_remove_modules(svc);
1391
1392         gb_connection_disable(svc->connection);
1393 }
1394
1395 void gb_svc_put(struct gb_svc *svc)
1396 {
1397         put_device(&svc->dev);
1398 }