drivers/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 #include <linux/greybus.h>
  12
  13 #define SVC_INTF_EJECT_TIMEOUT          9000
  14 #define SVC_INTF_ACTIVATE_TIMEOUT       6000
  15 #define SVC_INTF_RESUME_TIMEOUT         3000
  16
  17 struct gb_svc_deferred_request {
  18         struct work_struct work;
  19         struct gb_operation *operation;
  20 };
  21
  22 static int gb_svc_queue_deferred_request(struct gb_operation *operation);
  23
  24 static ssize_t endo_id_show(struct device *dev,
  25                             struct device_attribute *attr, char *buf)
  26 {
  27         struct gb_svc *svc = to_gb_svc(dev);
  28
  29         return sprintf(buf, "0x%04x\n", svc->endo_id);
  30 }
  31 static DEVICE_ATTR_RO(endo_id);
  32
  33 static ssize_t ap_intf_id_show(struct device *dev,
  34                                struct device_attribute *attr, char *buf)
  35 {
  36         struct gb_svc *svc = to_gb_svc(dev);
  37
  38         return sprintf(buf, "%u\n", svc->ap_intf_id);
  39 }
  40 static DEVICE_ATTR_RO(ap_intf_id);
  41
  42 // FIXME
  43 // This is a hack, we need to do this "right" and clean the interface up
  44 // properly, not just forcibly yank the thing out of the system and hope for the
  45 // best.  But for now, people want their modules to come out without having to
  46 // throw the thing to the ground or get out a screwdriver.
  47 static ssize_t intf_eject_store(struct device *dev,
  48                                 struct device_attribute *attr, const char *buf,
  49                                 size_t len)
  50 {
  51         struct gb_svc *svc = to_gb_svc(dev);
  52         unsigned short intf_id;
  53         int ret;
  54
  55         ret = kstrtou16(buf, 10, &intf_id);
  56         if (ret < 0)
  57                 return ret;
  58
  59         dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
  60
  61         ret = gb_svc_intf_eject(svc, intf_id);
  62         if (ret < 0)
  63                 return ret;
  64
  65         return len;
  66 }
  67 static DEVICE_ATTR_WO(intf_eject);
  68
  69 static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr,
  70                              char *buf)
  71 {
  72         struct gb_svc *svc = to_gb_svc(dev);
  73
  74         return sprintf(buf, "%s\n",
  75                        gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled");
  76 }
  77
  78 static ssize_t watchdog_store(struct device *dev,
  79                               struct device_attribute *attr, const char *buf,
  80                               size_t len)
  81 {
  82         struct gb_svc *svc = to_gb_svc(dev);
  83         int retval;
  84         bool user_request;
  85
  86         retval = strtobool(buf, &user_request);
  87         if (retval)
  88                 return retval;
  89
  90         if (user_request)
  91                 retval = gb_svc_watchdog_enable(svc);
  92         else
  93                 retval = gb_svc_watchdog_disable(svc);
  94         if (retval)
  95                 return retval;
  96         return len;
  97 }
  98 static DEVICE_ATTR_RW(watchdog);
  99
 100 static ssize_t watchdog_action_show(struct device *dev,
 101                                     struct device_attribute *attr, char *buf)
 102 {
 103         struct gb_svc *svc = to_gb_svc(dev);
 104
 105         if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL)
 106                 return sprintf(buf, "panic\n");
 107         else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO)
 108                 return sprintf(buf, "reset\n");
 109
 110         return -EINVAL;
 111 }
 112
 113 static ssize_t watchdog_action_store(struct device *dev,
 114                                      struct device_attribute *attr,
 115                                      const char *buf, size_t len)
 116 {
 117         struct gb_svc *svc = to_gb_svc(dev);
 118
 119         if (sysfs_streq(buf, "panic"))
 120                 svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL;
 121         else if (sysfs_streq(buf, "reset"))
 122                 svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO;
 123         else
 124                 return -EINVAL;
 125
 126         return len;
 127 }
 128 static DEVICE_ATTR_RW(watchdog_action);
 129
 130 static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value)
 131 {
 132         struct gb_svc_pwrmon_rail_count_get_response response;
 133         int ret;
 134
 135         ret = gb_operation_sync(svc->connection,
 136                                 GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0,
 137                                 &response, sizeof(response));
 138         if (ret) {
 139                 dev_err(&svc->dev, "failed to get rail count: %d\n", ret);
 140                 return ret;
 141         }
 142
 143         *value = response.rail_count;
 144
 145         return 0;
 146 }
 147
 148 static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc,
 149                 struct gb_svc_pwrmon_rail_names_get_response *response,
 150                 size_t bufsize)
 151 {
 152         int ret;
 153
 154         ret = gb_operation_sync(svc->connection,
 155                                 GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0,
 156                                 response, bufsize);
 157         if (ret) {
 158                 dev_err(&svc->dev, "failed to get rail names: %d\n", ret);
 159                 return ret;
 160         }
 161
 162         if (response->status != GB_SVC_OP_SUCCESS) {
 163                 dev_err(&svc->dev,
 164                         "SVC error while getting rail names: %u\n",
 165                         response->status);
 166                 return -EREMOTEIO;
 167         }
 168
 169         return 0;
 170 }
 171
 172 static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id,
 173                                     u8 measurement_type, u32 *value)
 174 {
 175         struct gb_svc_pwrmon_sample_get_request request;
 176         struct gb_svc_pwrmon_sample_get_response response;
 177         int ret;
 178
 179         request.rail_id = rail_id;
 180         request.measurement_type = measurement_type;
 181
 182         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET,
 183                                 &request, sizeof(request),
 184                                 &response, sizeof(response));
 185         if (ret) {
 186                 dev_err(&svc->dev, "failed to get rail sample: %d\n", ret);
 187                 return ret;
 188         }
 189
 190         if (response.result) {
 191                 dev_err(&svc->dev,
 192                         "UniPro error while getting rail power sample (%d %d): %d\n",
 193                         rail_id, measurement_type, response.result);
 194                 switch (response.result) {
 195                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 196                         return -EINVAL;
 197                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 198                         return -ENOMSG;
 199                 default:
 200                         return -EREMOTEIO;
 201                 }
 202         }
 203
 204         *value = le32_to_cpu(response.measurement);
 205
 206         return 0;
 207 }
 208
 209 int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
 210                                   u8 measurement_type, u32 *value)
 211 {
 212         struct gb_svc_pwrmon_intf_sample_get_request request;
 213         struct gb_svc_pwrmon_intf_sample_get_response response;
 214         int ret;
 215
 216         request.intf_id = intf_id;
 217         request.measurement_type = measurement_type;
 218
 219         ret = gb_operation_sync(svc->connection,
 220                                 GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET,
 221                                 &request, sizeof(request),
 222                                 &response, sizeof(response));
 223         if (ret) {
 224                 dev_err(&svc->dev, "failed to get intf sample: %d\n", ret);
 225                 return ret;
 226         }
 227
 228         if (response.result) {
 229                 dev_err(&svc->dev,
 230                         "UniPro error while getting intf power sample (%d %d): %d\n",
 231                         intf_id, measurement_type, response.result);
 232                 switch (response.result) {
 233                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 234                         return -EINVAL;
 235                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 236                         return -ENOMSG;
 237                 default:
 238                         return -EREMOTEIO;
 239                 }
 240         }
 241
 242         *value = le32_to_cpu(response.measurement);
 243
 244         return 0;
 245 }
 246
 247 static struct attribute *svc_attrs[] = {
 248         &dev_attr_endo_id.attr,
 249         &dev_attr_ap_intf_id.attr,
 250         &dev_attr_intf_eject.attr,
 251         &dev_attr_watchdog.attr,
 252         &dev_attr_watchdog_action.attr,
 253         NULL,
 254 };
 255 ATTRIBUTE_GROUPS(svc);
 256
 257 int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
 258 {
 259         struct gb_svc_intf_device_id_request request;
 260
 261         request.intf_id = intf_id;
 262         request.device_id = device_id;
 263
 264         return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
 265                                  &request, sizeof(request), NULL, 0);
 266 }
 267
 268 int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
 269 {
 270         struct gb_svc_intf_eject_request request;
 271         int ret;
 272
 273         request.intf_id = intf_id;
 274
 275         /*
 276          * The pulse width for module release in svc is long so we need to
 277          * increase the timeout so the operation will not return to soon.
 278          */
 279         ret = gb_operation_sync_timeout(svc->connection,
 280                                         GB_SVC_TYPE_INTF_EJECT, &request,
 281                                         sizeof(request), NULL, 0,
 282                                         SVC_INTF_EJECT_TIMEOUT);
 283         if (ret) {
 284                 dev_err(&svc->dev, "failed to eject interface %u\n", intf_id);
 285                 return ret;
 286         }
 287
 288         return 0;
 289 }
 290
 291 int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable)
 292 {
 293         struct gb_svc_intf_vsys_request request;
 294         struct gb_svc_intf_vsys_response response;
 295         int type, ret;
 296
 297         request.intf_id = intf_id;
 298
 299         if (enable)
 300                 type = GB_SVC_TYPE_INTF_VSYS_ENABLE;
 301         else
 302                 type = GB_SVC_TYPE_INTF_VSYS_DISABLE;
 303
 304         ret = gb_operation_sync(svc->connection, type,
 305                                 &request, sizeof(request),
 306                                 &response, sizeof(response));
 307         if (ret < 0)
 308                 return ret;
 309         if (response.result_code != GB_SVC_INTF_VSYS_OK)
 310                 return -EREMOTEIO;
 311         return 0;
 312 }
 313
 314 int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable)
 315 {
 316         struct gb_svc_intf_refclk_request request;
 317         struct gb_svc_intf_refclk_response response;
 318         int type, ret;
 319
 320         request.intf_id = intf_id;
 321
 322         if (enable)
 323                 type = GB_SVC_TYPE_INTF_REFCLK_ENABLE;
 324         else
 325                 type = GB_SVC_TYPE_INTF_REFCLK_DISABLE;
 326
 327         ret = gb_operation_sync(svc->connection, type,
 328                                 &request, sizeof(request),
 329                                 &response, sizeof(response));
 330         if (ret < 0)
 331                 return ret;
 332         if (response.result_code != GB_SVC_INTF_REFCLK_OK)
 333                 return -EREMOTEIO;
 334         return 0;
 335 }
 336
 337 int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
 338 {
 339         struct gb_svc_intf_unipro_request request;
 340         struct gb_svc_intf_unipro_response response;
 341         int type, ret;
 342
 343         request.intf_id = intf_id;
 344
 345         if (enable)
 346                 type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE;
 347         else
 348                 type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE;
 349
 350         ret = gb_operation_sync(svc->connection, type,
 351                                 &request, sizeof(request),
 352                                 &response, sizeof(response));
 353         if (ret < 0)
 354                 return ret;
 355         if (response.result_code != GB_SVC_INTF_UNIPRO_OK)
 356                 return -EREMOTEIO;
 357         return 0;
 358 }
 359
 360 int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
 361 {
 362         struct gb_svc_intf_activate_request request;
 363         struct gb_svc_intf_activate_response response;
 364         int ret;
 365
 366         request.intf_id = intf_id;
 367
 368         ret = gb_operation_sync_timeout(svc->connection,
 369                                         GB_SVC_TYPE_INTF_ACTIVATE,
 370                                         &request, sizeof(request),
 371                                         &response, sizeof(response),
 372                                         SVC_INTF_ACTIVATE_TIMEOUT);
 373         if (ret < 0)
 374                 return ret;
 375         if (response.status != GB_SVC_OP_SUCCESS) {
 376                 dev_err(&svc->dev, "failed to activate interface %u: %u\n",
 377                         intf_id, response.status);
 378                 return -EREMOTEIO;
 379         }
 380
 381         *intf_type = response.intf_type;
 382
 383         return 0;
 384 }
 385
 386 int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id)
 387 {
 388         struct gb_svc_intf_resume_request request;
 389         struct gb_svc_intf_resume_response response;
 390         int ret;
 391
 392         request.intf_id = intf_id;
 393
 394         ret = gb_operation_sync_timeout(svc->connection,
 395                                         GB_SVC_TYPE_INTF_RESUME,
 396                                         &request, sizeof(request),
 397                                         &response, sizeof(response),
 398                                         SVC_INTF_RESUME_TIMEOUT);
 399         if (ret < 0) {
 400                 dev_err(&svc->dev, "failed to send interface resume %u: %d\n",
 401                         intf_id, ret);
 402                 return ret;
 403         }
 404
 405         if (response.status != GB_SVC_OP_SUCCESS) {
 406                 dev_err(&svc->dev, "failed to resume interface %u: %u\n",
 407                         intf_id, response.status);
 408                 return -EREMOTEIO;
 409         }
 410
 411         return 0;
 412 }
 413
 414 int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 415                         u32 *value)
 416 {
 417         struct gb_svc_dme_peer_get_request request;
 418         struct gb_svc_dme_peer_get_response response;
 419         u16 result;
 420         int ret;
 421
 422         request.intf_id = intf_id;
 423         request.attr = cpu_to_le16(attr);
 424         request.selector = cpu_to_le16(selector);
 425
 426         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
 427                                 &request, sizeof(request),
 428                                 &response, sizeof(response));
 429         if (ret) {
 430                 dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n",
 431                         intf_id, attr, selector, ret);
 432                 return ret;
 433         }
 434
 435         result = le16_to_cpu(response.result_code);
 436         if (result) {
 437                 dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n",
 438                         intf_id, attr, selector, result);
 439                 return -EREMOTEIO;
 440         }
 441
 442         if (value)
 443                 *value = le32_to_cpu(response.attr_value);
 444
 445         return 0;
 446 }
 447
 448 int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 449                         u32 value)
 450 {
 451         struct gb_svc_dme_peer_set_request request;
 452         struct gb_svc_dme_peer_set_response response;
 453         u16 result;
 454         int ret;
 455
 456         request.intf_id = intf_id;
 457         request.attr = cpu_to_le16(attr);
 458         request.selector = cpu_to_le16(selector);
 459         request.value = cpu_to_le32(value);
 460
 461         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
 462                                 &request, sizeof(request),
 463                                 &response, sizeof(response));
 464         if (ret) {
 465                 dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n",
 466                         intf_id, attr, selector, value, ret);
 467                 return ret;
 468         }
 469
 470         result = le16_to_cpu(response.result_code);
 471         if (result) {
 472                 dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n",
 473                         intf_id, attr, selector, value, result);
 474                 return -EREMOTEIO;
 475         }
 476
 477         return 0;
 478 }
 479
 480 int gb_svc_connection_create(struct gb_svc *svc,
 481                              u8 intf1_id, u16 cport1_id,
 482                              u8 intf2_id, u16 cport2_id,
 483                              u8 cport_flags)
 484 {
 485         struct gb_svc_conn_create_request request;
 486
 487         request.intf1_id = intf1_id;
 488         request.cport1_id = cpu_to_le16(cport1_id);
 489         request.intf2_id = intf2_id;
 490         request.cport2_id = cpu_to_le16(cport2_id);
 491         request.tc = 0;         /* TC0 */
 492         request.flags = cport_flags;
 493
 494         return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
 495                                  &request, sizeof(request), NULL, 0);
 496 }
 497
 498 void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
 499                                u8 intf2_id, u16 cport2_id)
 500 {
 501         struct gb_svc_conn_destroy_request request;
 502         struct gb_connection *connection = svc->connection;
 503         int ret;
 504
 505         request.intf1_id = intf1_id;
 506         request.cport1_id = cpu_to_le16(cport1_id);
 507         request.intf2_id = intf2_id;
 508         request.cport2_id = cpu_to_le16(cport2_id);
 509
 510         ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
 511                                 &request, sizeof(request), NULL, 0);
 512         if (ret) {
 513                 dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n",
 514                         intf1_id, cport1_id, intf2_id, cport2_id, ret);
 515         }
 516 }
 517
 518 /* Creates bi-directional routes between the devices */
 519 int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
 520                         u8 intf2_id, u8 dev2_id)
 521 {
 522         struct gb_svc_route_create_request request;
 523
 524         request.intf1_id = intf1_id;
 525         request.dev1_id = dev1_id;
 526         request.intf2_id = intf2_id;
 527         request.dev2_id = dev2_id;
 528
 529         return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
 530                                  &request, sizeof(request), NULL, 0);
 531 }
 532
 533 /* Destroys bi-directional routes between the devices */
 534 void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
 535 {
 536         struct gb_svc_route_destroy_request request;
 537         int ret;
 538
 539         request.intf1_id = intf1_id;
 540         request.intf2_id = intf2_id;
 541
 542         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
 543                                 &request, sizeof(request), NULL, 0);
 544         if (ret) {
 545                 dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
 546                         intf1_id, intf2_id, ret);
 547         }
 548 }
 549
 550 int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
 551                                u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
 552                                u8 tx_amplitude, u8 tx_hs_equalizer,
 553                                u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
 554                                u8 flags, u32 quirks,
 555                                struct gb_svc_l2_timer_cfg *local,
 556                                struct gb_svc_l2_timer_cfg *remote)
 557 {
 558         struct gb_svc_intf_set_pwrm_request request;
 559         struct gb_svc_intf_set_pwrm_response response;
 560         int ret;
 561         u16 result_code;
 562
 563         memset(&request, 0, sizeof(request));
 564
 565         request.intf_id = intf_id;
 566         request.hs_series = hs_series;
 567         request.tx_mode = tx_mode;
 568         request.tx_gear = tx_gear;
 569         request.tx_nlanes = tx_nlanes;
 570         request.tx_amplitude = tx_amplitude;
 571         request.tx_hs_equalizer = tx_hs_equalizer;
 572         request.rx_mode = rx_mode;
 573         request.rx_gear = rx_gear;
 574         request.rx_nlanes = rx_nlanes;
 575         request.flags = flags;
 576         request.quirks = cpu_to_le32(quirks);
 577         if (local)
 578                 request.local_l2timerdata = *local;
 579         if (remote)
 580                 request.remote_l2timerdata = *remote;
 581
 582         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 583                                 &request, sizeof(request),
 584                                 &response, sizeof(response));
 585         if (ret < 0)
 586                 return ret;
 587
 588         result_code = response.result_code;
 589         if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) {
 590                 dev_err(&svc->dev, "set power mode = %d\n", result_code);
 591                 return -EIO;
 592         }
 593
 594         return 0;
 595 }
 596 EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
 597
 598 int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id)
 599 {
 600         struct gb_svc_intf_set_pwrm_request request;
 601         struct gb_svc_intf_set_pwrm_response response;
 602         int ret;
 603         u16 result_code;
 604
 605         memset(&request, 0, sizeof(request));
 606
 607         request.intf_id = intf_id;
 608         request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A;
 609         request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 610         request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 611
 612         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 613                                 &request, sizeof(request),
 614                                 &response, sizeof(response));
 615         if (ret < 0) {
 616                 dev_err(&svc->dev,
 617                         "failed to send set power mode operation to interface %u: %d\n",
 618                         intf_id, ret);
 619                 return ret;
 620         }
 621
 622         result_code = response.result_code;
 623         if (result_code != GB_SVC_SETPWRM_PWR_OK) {
 624                 dev_err(&svc->dev,
 625                         "failed to hibernate the link for interface %u: %u\n",
 626                         intf_id, result_code);
 627                 return -EIO;
 628         }
 629
 630         return 0;
 631 }
 632
 633 int gb_svc_ping(struct gb_svc *svc)
 634 {
 635         return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
 636                                          NULL, 0, NULL, 0,
 637                                          GB_OPERATION_TIMEOUT_DEFAULT * 2);
 638 }
 639
 640 static int gb_svc_version_request(struct gb_operation *op)
 641 {
 642         struct gb_connection *connection = op->connection;
 643         struct gb_svc *svc = gb_connection_get_data(connection);
 644         struct gb_svc_version_request *request;
 645         struct gb_svc_version_response *response;
 646
 647         if (op->request->payload_size < sizeof(*request)) {
 648                 dev_err(&svc->dev, "short version request (%zu < %zu)\n",
 649                         op->request->payload_size,
 650                         sizeof(*request));
 651                 return -EINVAL;
 652         }
 653
 654         request = op->request->payload;
 655
 656         if (request->major > GB_SVC_VERSION_MAJOR) {
 657                 dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
 658                          request->major, GB_SVC_VERSION_MAJOR);
 659                 return -ENOTSUPP;
 660         }
 661
 662         svc->protocol_major = request->major;
 663         svc->protocol_minor = request->minor;
 664
 665         if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
 666                 return -ENOMEM;
 667
 668         response = op->response->payload;
 669         response->major = svc->protocol_major;
 670         response->minor = svc->protocol_minor;
 671
 672         return 0;
 673 }
 674
 675 static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf,
 676                                         size_t len, loff_t *offset)
 677 {
 678         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 679                 file_inode(file)->i_private;
 680         struct gb_svc *svc = pwrmon_rails->svc;
 681         int ret, desc;
 682         u32 value;
 683         char buff[16];
 684
 685         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 686                                        GB_SVC_PWRMON_TYPE_VOL, &value);
 687         if (ret) {
 688                 dev_err(&svc->dev,
 689                         "failed to get voltage sample %u: %d\n",
 690                         pwrmon_rails->id, ret);
 691                 return ret;
 692         }
 693
 694         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 695
 696         return simple_read_from_buffer(buf, len, offset, buff, desc);
 697 }
 698
 699 static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf,
 700                                         size_t len, loff_t *offset)
 701 {
 702         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 703                 file_inode(file)->i_private;
 704         struct gb_svc *svc = pwrmon_rails->svc;
 705         int ret, desc;
 706         u32 value;
 707         char buff[16];
 708
 709         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 710                                        GB_SVC_PWRMON_TYPE_CURR, &value);
 711         if (ret) {
 712                 dev_err(&svc->dev,
 713                         "failed to get current sample %u: %d\n",
 714                         pwrmon_rails->id, ret);
 715                 return ret;
 716         }
 717
 718         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 719
 720         return simple_read_from_buffer(buf, len, offset, buff, desc);
 721 }
 722
 723 static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf,
 724                                       size_t len, loff_t *offset)
 725 {
 726         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 727                 file_inode(file)->i_private;
 728         struct gb_svc *svc = pwrmon_rails->svc;
 729         int ret, desc;
 730         u32 value;
 731         char buff[16];
 732
 733         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 734                                        GB_SVC_PWRMON_TYPE_PWR, &value);
 735         if (ret) {
 736                 dev_err(&svc->dev, "failed to get power sample %u: %d\n",
 737                         pwrmon_rails->id, ret);
 738                 return ret;
 739         }
 740
 741         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 742
 743         return simple_read_from_buffer(buf, len, offset, buff, desc);
 744 }
 745
 746 static const struct file_operations pwrmon_debugfs_voltage_fops = {
 747         .read           = pwr_debugfs_voltage_read,
 748 };
 749
 750 static const struct file_operations pwrmon_debugfs_current_fops = {
 751         .read           = pwr_debugfs_current_read,
 752 };
 753
 754 static const struct file_operations pwrmon_debugfs_power_fops = {
 755         .read           = pwr_debugfs_power_read,
 756 };
 757
 758 static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc)
 759 {
 760         int i;
 761         size_t bufsize;
 762         struct dentry *dent;
 763         struct gb_svc_pwrmon_rail_names_get_response *rail_names;
 764         u8 rail_count;
 765
 766         dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry);
 767         if (IS_ERR_OR_NULL(dent))
 768                 return;
 769
 770         if (gb_svc_pwrmon_rail_count_get(svc, &rail_count))
 771                 goto err_pwrmon_debugfs;
 772
 773         if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT)
 774                 goto err_pwrmon_debugfs;
 775
 776         bufsize = sizeof(*rail_names) +
 777                 GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count;
 778
 779         rail_names = kzalloc(bufsize, GFP_KERNEL);
 780         if (!rail_names)
 781                 goto err_pwrmon_debugfs;
 782
 783         svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails),
 784                                     GFP_KERNEL);
 785         if (!svc->pwrmon_rails)
 786                 goto err_pwrmon_debugfs_free;
 787
 788         if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize))
 789                 goto err_pwrmon_debugfs_free;
 790
 791         for (i = 0; i < rail_count; i++) {
 792                 struct dentry *dir;
 793                 struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i];
 794                 char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE];
 795
 796                 snprintf(fname, sizeof(fname), "%s",
 797                          (char *)&rail_names->name[i]);
 798
 799                 rail->id = i;
 800                 rail->svc = svc;
 801
 802                 dir = debugfs_create_dir(fname, dent);
 803                 debugfs_create_file("voltage_now", 0444, dir, rail,
 804                                     &pwrmon_debugfs_voltage_fops);
 805                 debugfs_create_file("current_now", 0444, dir, rail,
 806                                     &pwrmon_debugfs_current_fops);
 807                 debugfs_create_file("power_now", 0444, dir, rail,
 808                                     &pwrmon_debugfs_power_fops);
 809         }
 810
 811         kfree(rail_names);
 812         return;
 813
 814 err_pwrmon_debugfs_free:
 815         kfree(rail_names);
 816         kfree(svc->pwrmon_rails);
 817         svc->pwrmon_rails = NULL;
 818
 819 err_pwrmon_debugfs:
 820         debugfs_remove(dent);
 821 }
 822
 823 static void gb_svc_debugfs_init(struct gb_svc *svc)
 824 {
 825         svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev),
 826                                                  gb_debugfs_get());
 827         gb_svc_pwrmon_debugfs_init(svc);
 828 }
 829
 830 static void gb_svc_debugfs_exit(struct gb_svc *svc)
 831 {
 832         debugfs_remove_recursive(svc->debugfs_dentry);
 833         kfree(svc->pwrmon_rails);
 834         svc->pwrmon_rails = NULL;
 835 }
 836
 837 static int gb_svc_hello(struct gb_operation *op)
 838 {
 839         struct gb_connection *connection = op->connection;
 840         struct gb_svc *svc = gb_connection_get_data(connection);
 841         struct gb_svc_hello_request *hello_request;
 842         int ret;
 843
 844         if (op->request->payload_size < sizeof(*hello_request)) {
 845                 dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
 846                          op->request->payload_size,
 847                          sizeof(*hello_request));
 848                 return -EINVAL;
 849         }
 850
 851         hello_request = op->request->payload;
 852         svc->endo_id = le16_to_cpu(hello_request->endo_id);
 853         svc->ap_intf_id = hello_request->interface_id;
 854
 855         ret = device_add(&svc->dev);
 856         if (ret) {
 857                 dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
 858                 return ret;
 859         }
 860
 861         ret = gb_svc_watchdog_create(svc);
 862         if (ret) {
 863                 dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
 864                 goto err_unregister_device;
 865         }
 866
 867         gb_svc_debugfs_init(svc);
 868
 869         ret = gb_svc_queue_deferred_request(op);
 870         if (ret)
 871                 goto err_remove_debugfs;
 872
 873         return 0;
 874
 875 err_remove_debugfs:
 876         gb_svc_debugfs_exit(svc);
 877 err_unregister_device:
 878         gb_svc_watchdog_destroy(svc);
 879         device_del(&svc->dev);
 880         return ret;
 881 }
 882
 883 static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
 884                                                     u8 intf_id)
 885 {
 886         struct gb_host_device *hd = svc->hd;
 887         struct gb_module *module;
 888         size_t num_interfaces;
 889         u8 module_id;
 890
 891         list_for_each_entry(module, &hd->modules, hd_node) {
 892                 module_id = module->module_id;
 893                 num_interfaces = module->num_interfaces;
 894
 895                 if (intf_id >= module_id &&
 896                     intf_id < module_id + num_interfaces) {
 897                         return module->interfaces[intf_id - module_id];
 898                 }
 899         }
 900
 901         return NULL;
 902 }
 903
 904 static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
 905 {
 906         struct gb_host_device *hd = svc->hd;
 907         struct gb_module *module;
 908
 909         list_for_each_entry(module, &hd->modules, hd_node) {
 910                 if (module->module_id == module_id)
 911                         return module;
 912         }
 913
 914         return NULL;
 915 }
 916
 917 static void gb_svc_process_hello_deferred(struct gb_operation *operation)
 918 {
 919         struct gb_connection *connection = operation->connection;
 920         struct gb_svc *svc = gb_connection_get_data(connection);
 921         int ret;
 922
 923         /*
 924          * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch
 925          * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient
 926          * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged
 927          * module.
 928          *
 929          * The code should be removed once SW-2217, Heuristic for UniPro
 930          * Power Mode Changes is resolved.
 931          */
 932         ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
 933                                          GB_SVC_UNIPRO_HS_SERIES_A,
 934                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 935                                          2, 1,
 936                                          GB_SVC_SMALL_AMPLITUDE,
 937                                          GB_SVC_NO_DE_EMPHASIS,
 938                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 939                                          2, 1,
 940                                          0, 0,
 941                                          NULL, NULL);
 942
 943         if (ret)
 944                 dev_warn(&svc->dev,
 945                          "power mode change failed on AP to switch link: %d\n",
 946                          ret);
 947 }
 948
 949 static void gb_svc_process_module_inserted(struct gb_operation *operation)
 950 {
 951         struct gb_svc_module_inserted_request *request;
 952         struct gb_connection *connection = operation->connection;
 953         struct gb_svc *svc = gb_connection_get_data(connection);
 954         struct gb_host_device *hd = svc->hd;
 955         struct gb_module *module;
 956         size_t num_interfaces;
 957         u8 module_id;
 958         u16 flags;
 959         int ret;
 960
 961         /* The request message size has already been verified. */
 962         request = operation->request->payload;
 963         module_id = request->primary_intf_id;
 964         num_interfaces = request->intf_count;
 965         flags = le16_to_cpu(request->flags);
 966
 967         dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n",
 968                 __func__, module_id, num_interfaces, flags);
 969
 970         if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) {
 971                 dev_warn(&svc->dev, "no primary interface detected on module %u\n",
 972                          module_id);
 973         }
 974
 975         module = gb_svc_module_lookup(svc, module_id);
 976         if (module) {
 977                 dev_warn(&svc->dev, "unexpected module-inserted event %u\n",
 978                          module_id);
 979                 return;
 980         }
 981
 982         module = gb_module_create(hd, module_id, num_interfaces);
 983         if (!module) {
 984                 dev_err(&svc->dev, "failed to create module\n");
 985                 return;
 986         }
 987
 988         ret = gb_module_add(module);
 989         if (ret) {
 990                 gb_module_put(module);
 991                 return;
 992         }
 993
 994         list_add(&module->hd_node, &hd->modules);
 995 }
 996
 997 static void gb_svc_process_module_removed(struct gb_operation *operation)
 998 {
 999         struct gb_svc_module_removed_request *request;
1000         struct gb_connection *connection = operation->connection;
1001         struct gb_svc *svc = gb_connection_get_data(connection);
1002         struct gb_module *module;
1003         u8 module_id;
1004
1005         /* The request message size has already been verified. */
1006         request = operation->request->payload;
1007         module_id = request->primary_intf_id;
1008
1009         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id);
1010
1011         module = gb_svc_module_lookup(svc, module_id);
1012         if (!module) {
1013                 dev_warn(&svc->dev, "unexpected module-removed event %u\n",
1014                          module_id);
1015                 return;
1016         }
1017
1018         module->disconnected = true;
1019
1020         gb_module_del(module);
1021         list_del(&module->hd_node);
1022         gb_module_put(module);
1023 }
1024
1025 static void gb_svc_process_intf_oops(struct gb_operation *operation)
1026 {
1027         struct gb_svc_intf_oops_request *request;
1028         struct gb_connection *connection = operation->connection;
1029         struct gb_svc *svc = gb_connection_get_data(connection);
1030         struct gb_interface *intf;
1031         u8 intf_id;
1032         u8 reason;
1033
1034         /* The request message size has already been verified. */
1035         request = operation->request->payload;
1036         intf_id = request->intf_id;
1037         reason = request->reason;
1038
1039         intf = gb_svc_interface_lookup(svc, intf_id);
1040         if (!intf) {
1041                 dev_warn(&svc->dev, "unexpected interface-oops event %u\n",
1042                          intf_id);
1043                 return;
1044         }
1045
1046         dev_info(&svc->dev, "Deactivating interface %u, interface oops reason = %u\n",
1047                  intf_id, reason);
1048
1049         mutex_lock(&intf->mutex);
1050         intf->disconnected = true;
1051         gb_interface_disable(intf);
1052         gb_interface_deactivate(intf);
1053         mutex_unlock(&intf->mutex);
1054 }
1055
1056 static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
1057 {
1058         struct gb_svc_intf_mailbox_event_request *request;
1059         struct gb_connection *connection = operation->connection;
1060         struct gb_svc *svc = gb_connection_get_data(connection);
1061         struct gb_interface *intf;
1062         u8 intf_id;
1063         u16 result_code;
1064         u32 mailbox;
1065
1066         /* The request message size has already been verified. */
1067         request = operation->request->payload;
1068         intf_id = request->intf_id;
1069         result_code = le16_to_cpu(request->result_code);
1070         mailbox = le32_to_cpu(request->mailbox);
1071
1072         dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
1073                 __func__, intf_id, result_code, mailbox);
1074
1075         intf = gb_svc_interface_lookup(svc, intf_id);
1076         if (!intf) {
1077                 dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
1078                 return;
1079         }
1080
1081         gb_interface_mailbox_event(intf, result_code, mailbox);
1082 }
1083
1084 static void gb_svc_process_deferred_request(struct work_struct *work)
1085 {
1086         struct gb_svc_deferred_request *dr;
1087         struct gb_operation *operation;
1088         struct gb_svc *svc;
1089         u8 type;
1090
1091         dr = container_of(work, struct gb_svc_deferred_request, work);
1092         operation = dr->operation;
1093         svc = gb_connection_get_data(operation->connection);
1094         type = operation->request->header->type;
1095
1096         switch (type) {
1097         case GB_SVC_TYPE_SVC_HELLO:
1098                 gb_svc_process_hello_deferred(operation);
1099                 break;
1100         case GB_SVC_TYPE_MODULE_INSERTED:
1101                 gb_svc_process_module_inserted(operation);
1102                 break;
1103         case GB_SVC_TYPE_MODULE_REMOVED:
1104                 gb_svc_process_module_removed(operation);
1105                 break;
1106         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1107                 gb_svc_process_intf_mailbox_event(operation);
1108                 break;
1109         case GB_SVC_TYPE_INTF_OOPS:
1110                 gb_svc_process_intf_oops(operation);
1111                 break;
1112         default:
1113                 dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
1114         }
1115
1116         gb_operation_put(operation);
1117         kfree(dr);
1118 }
1119
1120 static int gb_svc_queue_deferred_request(struct gb_operation *operation)
1121 {
1122         struct gb_svc *svc = gb_connection_get_data(operation->connection);
1123         struct gb_svc_deferred_request *dr;
1124
1125         dr = kmalloc(sizeof(*dr), GFP_KERNEL);
1126         if (!dr)
1127                 return -ENOMEM;
1128
1129         gb_operation_get(operation);
1130
1131         dr->operation = operation;
1132         INIT_WORK(&dr->work, gb_svc_process_deferred_request);
1133
1134         queue_work(svc->wq, &dr->work);
1135
1136         return 0;
1137 }
1138
1139 static int gb_svc_intf_reset_recv(struct gb_operation *op)
1140 {
1141         struct gb_svc *svc = gb_connection_get_data(op->connection);
1142         struct gb_message *request = op->request;
1143         struct gb_svc_intf_reset_request *reset;
1144
1145         if (request->payload_size < sizeof(*reset)) {
1146                 dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
1147                          request->payload_size, sizeof(*reset));
1148                 return -EINVAL;
1149         }
1150         reset = request->payload;
1151
1152         /* FIXME Reset the interface here */
1153
1154         return 0;
1155 }
1156
1157 static int gb_svc_module_inserted_recv(struct gb_operation *op)
1158 {
1159         struct gb_svc *svc = gb_connection_get_data(op->connection);
1160         struct gb_svc_module_inserted_request *request;
1161
1162         if (op->request->payload_size < sizeof(*request)) {
1163                 dev_warn(&svc->dev, "short module-inserted request received (%zu < %zu)\n",
1164                          op->request->payload_size, sizeof(*request));
1165                 return -EINVAL;
1166         }
1167
1168         request = op->request->payload;
1169
1170         dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1171                 request->primary_intf_id);
1172
1173         return gb_svc_queue_deferred_request(op);
1174 }
1175
1176 static int gb_svc_module_removed_recv(struct gb_operation *op)
1177 {
1178         struct gb_svc *svc = gb_connection_get_data(op->connection);
1179         struct gb_svc_module_removed_request *request;
1180
1181         if (op->request->payload_size < sizeof(*request)) {
1182                 dev_warn(&svc->dev, "short module-removed request received (%zu < %zu)\n",
1183                          op->request->payload_size, sizeof(*request));
1184                 return -EINVAL;
1185         }
1186
1187         request = op->request->payload;
1188
1189         dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1190                 request->primary_intf_id);
1191
1192         return gb_svc_queue_deferred_request(op);
1193 }
1194
1195 static int gb_svc_intf_oops_recv(struct gb_operation *op)
1196 {
1197         struct gb_svc *svc = gb_connection_get_data(op->connection);
1198         struct gb_svc_intf_oops_request *request;
1199
1200         if (op->request->payload_size < sizeof(*request)) {
1201                 dev_warn(&svc->dev, "short intf-oops request received (%zu < %zu)\n",
1202                          op->request->payload_size, sizeof(*request));
1203                 return -EINVAL;
1204         }
1205
1206         return gb_svc_queue_deferred_request(op);
1207 }
1208
1209 static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op)
1210 {
1211         struct gb_svc *svc = gb_connection_get_data(op->connection);
1212         struct gb_svc_intf_mailbox_event_request *request;
1213
1214         if (op->request->payload_size < sizeof(*request)) {
1215                 dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n",
1216                          op->request->payload_size, sizeof(*request));
1217                 return -EINVAL;
1218         }
1219
1220         request = op->request->payload;
1221
1222         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
1223
1224         return gb_svc_queue_deferred_request(op);
1225 }
1226
1227 static int gb_svc_request_handler(struct gb_operation *op)
1228 {
1229         struct gb_connection *connection = op->connection;
1230         struct gb_svc *svc = gb_connection_get_data(connection);
1231         u8 type = op->type;
1232         int ret = 0;
1233
1234         /*
1235          * SVC requests need to follow a specific order (at least initially) and
1236          * below code takes care of enforcing that. The expected order is:
1237          * - PROTOCOL_VERSION
1238          * - SVC_HELLO
1239          * - Any other request, but the earlier two.
1240          *
1241          * Incoming requests are guaranteed to be serialized and so we don't
1242          * need to protect 'state' for any races.
1243          */
1244         switch (type) {
1245         case GB_SVC_TYPE_PROTOCOL_VERSION:
1246                 if (svc->state != GB_SVC_STATE_RESET)
1247                         ret = -EINVAL;
1248                 break;
1249         case GB_SVC_TYPE_SVC_HELLO:
1250                 if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
1251                         ret = -EINVAL;
1252                 break;
1253         default:
1254                 if (svc->state != GB_SVC_STATE_SVC_HELLO)
1255                         ret = -EINVAL;
1256                 break;
1257         }
1258
1259         if (ret) {
1260                 dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
1261                          type, svc->state);
1262                 return ret;
1263         }
1264
1265         switch (type) {
1266         case GB_SVC_TYPE_PROTOCOL_VERSION:
1267                 ret = gb_svc_version_request(op);
1268                 if (!ret)
1269                         svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
1270                 return ret;
1271         case GB_SVC_TYPE_SVC_HELLO:
1272                 ret = gb_svc_hello(op);
1273                 if (!ret)
1274                         svc->state = GB_SVC_STATE_SVC_HELLO;
1275                 return ret;
1276         case GB_SVC_TYPE_INTF_RESET:
1277                 return gb_svc_intf_reset_recv(op);
1278         case GB_SVC_TYPE_MODULE_INSERTED:
1279                 return gb_svc_module_inserted_recv(op);
1280         case GB_SVC_TYPE_MODULE_REMOVED:
1281                 return gb_svc_module_removed_recv(op);
1282         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1283                 return gb_svc_intf_mailbox_event_recv(op);
1284         case GB_SVC_TYPE_INTF_OOPS:
1285                 return gb_svc_intf_oops_recv(op);
1286         default:
1287                 dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
1288                 return -EINVAL;
1289         }
1290 }
1291
1292 static void gb_svc_release(struct device *dev)
1293 {
1294         struct gb_svc *svc = to_gb_svc(dev);
1295
1296         if (svc->connection)
1297                 gb_connection_destroy(svc->connection);
1298         ida_destroy(&svc->device_id_map);
1299         destroy_workqueue(svc->wq);
1300         kfree(svc);
1301 }
1302
1303 struct device_type greybus_svc_type = {
1304         .name           = "greybus_svc",
1305         .release        = gb_svc_release,
1306 };
1307
1308 struct gb_svc *gb_svc_create(struct gb_host_device *hd)
1309 {
1310         struct gb_svc *svc;
1311
1312         svc = kzalloc(sizeof(*svc), GFP_KERNEL);
1313         if (!svc)
1314                 return NULL;
1315
1316         svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev));
1317         if (!svc->wq) {
1318                 kfree(svc);
1319                 return NULL;
1320         }
1321
1322         svc->dev.parent = &hd->dev;
1323         svc->dev.bus = &greybus_bus_type;
1324         svc->dev.type = &greybus_svc_type;
1325         svc->dev.groups = svc_groups;
1326         svc->dev.dma_mask = svc->dev.parent->dma_mask;
1327         device_initialize(&svc->dev);
1328
1329         dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
1330
1331         ida_init(&svc->device_id_map);
1332         svc->state = GB_SVC_STATE_RESET;
1333         svc->hd = hd;
1334
1335         svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
1336                                                       gb_svc_request_handler);
1337         if (IS_ERR(svc->connection)) {
1338                 dev_err(&svc->dev, "failed to create connection: %ld\n",
1339                         PTR_ERR(svc->connection));
1340                 goto err_put_device;
1341         }
1342
1343         gb_connection_set_data(svc->connection, svc);
1344
1345         return svc;
1346
1347 err_put_device:
1348         put_device(&svc->dev);
1349         return NULL;
1350 }
1351
1352 int gb_svc_add(struct gb_svc *svc)
1353 {
1354         int ret;
1355
1356         /*
1357          * The SVC protocol is currently driven by the SVC, so the SVC device
1358          * is added from the connection request handler when enough
1359          * information has been received.
1360          */
1361         ret = gb_connection_enable(svc->connection);
1362         if (ret)
1363                 return ret;
1364
1365         return 0;
1366 }
1367
1368 static void gb_svc_remove_modules(struct gb_svc *svc)
1369 {
1370         struct gb_host_device *hd = svc->hd;
1371         struct gb_module *module, *tmp;
1372
1373         list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) {
1374                 gb_module_del(module);
1375                 list_del(&module->hd_node);
1376                 gb_module_put(module);
1377         }
1378 }
1379
1380 void gb_svc_del(struct gb_svc *svc)
1381 {
1382         gb_connection_disable_rx(svc->connection);
1383
1384         /*
1385          * The SVC device may have been registered from the request handler.
1386          */
1387         if (device_is_registered(&svc->dev)) {
1388                 gb_svc_debugfs_exit(svc);
1389                 gb_svc_watchdog_destroy(svc);
1390                 device_del(&svc->dev);
1391         }
1392
1393         flush_workqueue(svc->wq);
1394
1395         gb_svc_remove_modules(svc);
1396
1397         gb_connection_disable(svc->connection);
1398 }
1399
1400 void gb_svc_put(struct gb_svc *svc)
1401 {
1402         put_device(&svc->dev);
1403 }