drivers/staging/greybus/svc.c

   1 /*
   2  * SVC Greybus driver.
   3  *
   4  * Copyright 2015 Google Inc.
   5  * Copyright 2015 Linaro Ltd.
   6  *
   7  * Released under the GPLv2 only.
   8  */
   9
  10 #include <linux/debugfs.h>
  11 #include <linux/workqueue.h>
  12
  13 #include "greybus.h"
  14
  15 #define SVC_INTF_EJECT_TIMEOUT          9000
  16 #define SVC_INTF_ACTIVATE_TIMEOUT       6000
  17 #define SVC_INTF_RESUME_TIMEOUT         3000
  18
  19 struct gb_svc_deferred_request {
  20         struct work_struct work;
  21         struct gb_operation *operation;
  22 };
  23
  24
  25 static int gb_svc_queue_deferred_request(struct gb_operation *operation);
  26
  27 static ssize_t endo_id_show(struct device *dev,
  28                         struct device_attribute *attr, char *buf)
  29 {
  30         struct gb_svc *svc = to_gb_svc(dev);
  31
  32         return sprintf(buf, "0x%04x\n", svc->endo_id);
  33 }
  34 static DEVICE_ATTR_RO(endo_id);
  35
  36 static ssize_t ap_intf_id_show(struct device *dev,
  37                         struct device_attribute *attr, char *buf)
  38 {
  39         struct gb_svc *svc = to_gb_svc(dev);
  40
  41         return sprintf(buf, "%u\n", svc->ap_intf_id);
  42 }
  43 static DEVICE_ATTR_RO(ap_intf_id);
  44
  45 // FIXME
  46 // This is a hack, we need to do this "right" and clean the interface up
  47 // properly, not just forcibly yank the thing out of the system and hope for the
  48 // best.  But for now, people want their modules to come out without having to
  49 // throw the thing to the ground or get out a screwdriver.
  50 static ssize_t intf_eject_store(struct device *dev,
  51                                 struct device_attribute *attr, const char *buf,
  52                                 size_t len)
  53 {
  54         struct gb_svc *svc = to_gb_svc(dev);
  55         unsigned short intf_id;
  56         int ret;
  57
  58         ret = kstrtou16(buf, 10, &intf_id);
  59         if (ret < 0)
  60                 return ret;
  61
  62         dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
  63
  64         ret = gb_svc_intf_eject(svc, intf_id);
  65         if (ret < 0)
  66                 return ret;
  67
  68         return len;
  69 }
  70 static DEVICE_ATTR_WO(intf_eject);
  71
  72 static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr,
  73                              char *buf)
  74 {
  75         struct gb_svc *svc = to_gb_svc(dev);
  76
  77         return sprintf(buf, "%s\n",
  78                        gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled");
  79 }
  80
  81 static ssize_t watchdog_store(struct device *dev,
  82                               struct device_attribute *attr, const char *buf,
  83                               size_t len)
  84 {
  85         struct gb_svc *svc = to_gb_svc(dev);
  86         int retval;
  87         bool user_request;
  88
  89         retval = strtobool(buf, &user_request);
  90         if (retval)
  91                 return retval;
  92
  93         if (user_request)
  94                 retval = gb_svc_watchdog_enable(svc);
  95         else
  96                 retval = gb_svc_watchdog_disable(svc);
  97         if (retval)
  98                 return retval;
  99         return len;
 100 }
 101 static DEVICE_ATTR_RW(watchdog);
 102
 103 static ssize_t watchdog_action_show(struct device *dev,
 104                                     struct device_attribute *attr, char *buf)
 105 {
 106         struct gb_svc *svc = to_gb_svc(dev);
 107
 108         if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL)
 109                 return sprintf(buf, "panic\n");
 110         else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO)
 111                 return sprintf(buf, "reset\n");
 112
 113         return -EINVAL;
 114 }
 115
 116 static ssize_t watchdog_action_store(struct device *dev,
 117                                      struct device_attribute *attr,
 118                                      const char *buf, size_t len)
 119 {
 120         struct gb_svc *svc = to_gb_svc(dev);
 121
 122         if (sysfs_streq(buf, "panic"))
 123                 svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL;
 124         else if (sysfs_streq(buf, "reset"))
 125                 svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO;
 126         else
 127                 return -EINVAL;
 128
 129         return len;
 130 }
 131 static DEVICE_ATTR_RW(watchdog_action);
 132
 133 static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value)
 134 {
 135         struct gb_svc_pwrmon_rail_count_get_response response;
 136         int ret;
 137
 138         ret = gb_operation_sync(svc->connection,
 139                                 GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0,
 140                                 &response, sizeof(response));
 141         if (ret) {
 142                 dev_err(&svc->dev, "failed to get rail count: %d\n", ret);
 143                 return ret;
 144         }
 145
 146         *value = response.rail_count;
 147
 148         return 0;
 149 }
 150
 151 static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc,
 152                 struct gb_svc_pwrmon_rail_names_get_response *response,
 153                 size_t bufsize)
 154 {
 155         int ret;
 156
 157         ret = gb_operation_sync(svc->connection,
 158                                 GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0,
 159                                 response, bufsize);
 160         if (ret) {
 161                 dev_err(&svc->dev, "failed to get rail names: %d\n", ret);
 162                 return ret;
 163         }
 164
 165         if (response->status != GB_SVC_OP_SUCCESS) {
 166                 dev_err(&svc->dev,
 167                         "SVC error while getting rail names: %u\n",
 168                         response->status);
 169                 return -EREMOTEIO;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id,
 176                                     u8 measurement_type, u32 *value)
 177 {
 178         struct gb_svc_pwrmon_sample_get_request request;
 179         struct gb_svc_pwrmon_sample_get_response response;
 180         int ret;
 181
 182         request.rail_id = rail_id;
 183         request.measurement_type = measurement_type;
 184
 185         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET,
 186                                 &request, sizeof(request),
 187                                 &response, sizeof(response));
 188         if (ret) {
 189                 dev_err(&svc->dev, "failed to get rail sample: %d\n", ret);
 190                 return ret;
 191         }
 192
 193         if (response.result) {
 194                 dev_err(&svc->dev,
 195                         "UniPro error while getting rail power sample (%d %d): %d\n",
 196                         rail_id, measurement_type, response.result);
 197                 switch (response.result) {
 198                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 199                         return -EINVAL;
 200                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 201                         return -ENOMSG;
 202                 default:
 203                         return -EREMOTEIO;
 204                 }
 205         }
 206
 207         *value = le32_to_cpu(response.measurement);
 208
 209         return 0;
 210 }
 211
 212 int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
 213                                   u8 measurement_type, u32 *value)
 214 {
 215         struct gb_svc_pwrmon_intf_sample_get_request request;
 216         struct gb_svc_pwrmon_intf_sample_get_response response;
 217         int ret;
 218
 219         request.intf_id = intf_id;
 220         request.measurement_type = measurement_type;
 221
 222         ret = gb_operation_sync(svc->connection,
 223                                 GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET,
 224                                 &request, sizeof(request),
 225                                 &response, sizeof(response));
 226         if (ret) {
 227                 dev_err(&svc->dev, "failed to get intf sample: %d\n", ret);
 228                 return ret;
 229         }
 230
 231         if (response.result) {
 232                 dev_err(&svc->dev,
 233                         "UniPro error while getting intf power sample (%d %d): %d\n",
 234                         intf_id, measurement_type, response.result);
 235                 switch (response.result) {
 236                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 237                         return -EINVAL;
 238                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 239                         return -ENOMSG;
 240                 default:
 241                         return -EREMOTEIO;
 242                 }
 243         }
 244
 245         *value = le32_to_cpu(response.measurement);
 246
 247         return 0;
 248 }
 249
 250 static struct attribute *svc_attrs[] = {
 251         &dev_attr_endo_id.attr,
 252         &dev_attr_ap_intf_id.attr,
 253         &dev_attr_intf_eject.attr,
 254         &dev_attr_watchdog.attr,
 255         &dev_attr_watchdog_action.attr,
 256         NULL,
 257 };
 258 ATTRIBUTE_GROUPS(svc);
 259
 260 int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
 261 {
 262         struct gb_svc_intf_device_id_request request;
 263
 264         request.intf_id = intf_id;
 265         request.device_id = device_id;
 266
 267         return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
 268                                  &request, sizeof(request), NULL, 0);
 269 }
 270
 271 int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
 272 {
 273         struct gb_svc_intf_eject_request request;
 274         int ret;
 275
 276         request.intf_id = intf_id;
 277
 278         /*
 279          * The pulse width for module release in svc is long so we need to
 280          * increase the timeout so the operation will not return to soon.
 281          */
 282         ret = gb_operation_sync_timeout(svc->connection,
 283                                         GB_SVC_TYPE_INTF_EJECT, &request,
 284                                         sizeof(request), NULL, 0,
 285                                         SVC_INTF_EJECT_TIMEOUT);
 286         if (ret) {
 287                 dev_err(&svc->dev, "failed to eject interface %u\n", intf_id);
 288                 return ret;
 289         }
 290
 291         return 0;
 292 }
 293
 294 int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable)
 295 {
 296         struct gb_svc_intf_vsys_request request;
 297         struct gb_svc_intf_vsys_response response;
 298         int type, ret;
 299
 300         request.intf_id = intf_id;
 301
 302         if (enable)
 303                 type = GB_SVC_TYPE_INTF_VSYS_ENABLE;
 304         else
 305                 type = GB_SVC_TYPE_INTF_VSYS_DISABLE;
 306
 307         ret = gb_operation_sync(svc->connection, type,
 308                         &request, sizeof(request),
 309                         &response, sizeof(response));
 310         if (ret < 0)
 311                 return ret;
 312         if (response.result_code != GB_SVC_INTF_VSYS_OK)
 313                 return -EREMOTEIO;
 314         return 0;
 315 }
 316
 317 int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable)
 318 {
 319         struct gb_svc_intf_refclk_request request;
 320         struct gb_svc_intf_refclk_response response;
 321         int type, ret;
 322
 323         request.intf_id = intf_id;
 324
 325         if (enable)
 326                 type = GB_SVC_TYPE_INTF_REFCLK_ENABLE;
 327         else
 328                 type = GB_SVC_TYPE_INTF_REFCLK_DISABLE;
 329
 330         ret = gb_operation_sync(svc->connection, type,
 331                         &request, sizeof(request),
 332                         &response, sizeof(response));
 333         if (ret < 0)
 334                 return ret;
 335         if (response.result_code != GB_SVC_INTF_REFCLK_OK)
 336                 return -EREMOTEIO;
 337         return 0;
 338 }
 339
 340 int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
 341 {
 342         struct gb_svc_intf_unipro_request request;
 343         struct gb_svc_intf_unipro_response response;
 344         int type, ret;
 345
 346         request.intf_id = intf_id;
 347
 348         if (enable)
 349                 type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE;
 350         else
 351                 type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE;
 352
 353         ret = gb_operation_sync(svc->connection, type,
 354                         &request, sizeof(request),
 355                         &response, sizeof(response));
 356         if (ret < 0)
 357                 return ret;
 358         if (response.result_code != GB_SVC_INTF_UNIPRO_OK)
 359                 return -EREMOTEIO;
 360         return 0;
 361 }
 362
 363 int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
 364 {
 365         struct gb_svc_intf_activate_request request;
 366         struct gb_svc_intf_activate_response response;
 367         int ret;
 368
 369         request.intf_id = intf_id;
 370
 371         ret = gb_operation_sync_timeout(svc->connection,
 372                         GB_SVC_TYPE_INTF_ACTIVATE,
 373                         &request, sizeof(request),
 374                         &response, sizeof(response),
 375                         SVC_INTF_ACTIVATE_TIMEOUT);
 376         if (ret < 0)
 377                 return ret;
 378         if (response.status != GB_SVC_OP_SUCCESS) {
 379                 dev_err(&svc->dev, "failed to activate interface %u: %u\n",
 380                                 intf_id, response.status);
 381                 return -EREMOTEIO;
 382         }
 383
 384         *intf_type = response.intf_type;
 385
 386         return 0;
 387 }
 388
 389 int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id)
 390 {
 391         struct gb_svc_intf_resume_request request;
 392         struct gb_svc_intf_resume_response response;
 393         int ret;
 394
 395         request.intf_id = intf_id;
 396
 397         ret = gb_operation_sync_timeout(svc->connection,
 398                                         GB_SVC_TYPE_INTF_RESUME,
 399                                         &request, sizeof(request),
 400                                         &response, sizeof(response),
 401                                         SVC_INTF_RESUME_TIMEOUT);
 402         if (ret < 0) {
 403                 dev_err(&svc->dev, "failed to send interface resume %u: %d\n",
 404                         intf_id, ret);
 405                 return ret;
 406         }
 407
 408         if (response.status != GB_SVC_OP_SUCCESS) {
 409                 dev_err(&svc->dev, "failed to resume interface %u: %u\n",
 410                         intf_id, response.status);
 411                 return -EREMOTEIO;
 412         }
 413
 414         return 0;
 415 }
 416
 417 int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 418                         u32 *value)
 419 {
 420         struct gb_svc_dme_peer_get_request request;
 421         struct gb_svc_dme_peer_get_response response;
 422         u16 result;
 423         int ret;
 424
 425         request.intf_id = intf_id;
 426         request.attr = cpu_to_le16(attr);
 427         request.selector = cpu_to_le16(selector);
 428
 429         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
 430                                 &request, sizeof(request),
 431                                 &response, sizeof(response));
 432         if (ret) {
 433                 dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n",
 434                                 intf_id, attr, selector, ret);
 435                 return ret;
 436         }
 437
 438         result = le16_to_cpu(response.result_code);
 439         if (result) {
 440                 dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n",
 441                                 intf_id, attr, selector, result);
 442                 return -EREMOTEIO;
 443         }
 444
 445         if (value)
 446                 *value = le32_to_cpu(response.attr_value);
 447
 448         return 0;
 449 }
 450
 451 int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 452                         u32 value)
 453 {
 454         struct gb_svc_dme_peer_set_request request;
 455         struct gb_svc_dme_peer_set_response response;
 456         u16 result;
 457         int ret;
 458
 459         request.intf_id = intf_id;
 460         request.attr = cpu_to_le16(attr);
 461         request.selector = cpu_to_le16(selector);
 462         request.value = cpu_to_le32(value);
 463
 464         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
 465                                 &request, sizeof(request),
 466                                 &response, sizeof(response));
 467         if (ret) {
 468                 dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n",
 469                                 intf_id, attr, selector, value, ret);
 470                 return ret;
 471         }
 472
 473         result = le16_to_cpu(response.result_code);
 474         if (result) {
 475                 dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n",
 476                                 intf_id, attr, selector, value, result);
 477                 return -EREMOTEIO;
 478         }
 479
 480         return 0;
 481 }
 482
 483 int gb_svc_connection_create(struct gb_svc *svc,
 484                                 u8 intf1_id, u16 cport1_id,
 485                                 u8 intf2_id, u16 cport2_id,
 486                                 u8 cport_flags)
 487 {
 488         struct gb_svc_conn_create_request request;
 489
 490         request.intf1_id = intf1_id;
 491         request.cport1_id = cpu_to_le16(cport1_id);
 492         request.intf2_id = intf2_id;
 493         request.cport2_id = cpu_to_le16(cport2_id);
 494         request.tc = 0;         /* TC0 */
 495         request.flags = cport_flags;
 496
 497         return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
 498                                  &request, sizeof(request), NULL, 0);
 499 }
 500
 501 void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
 502                                u8 intf2_id, u16 cport2_id)
 503 {
 504         struct gb_svc_conn_destroy_request request;
 505         struct gb_connection *connection = svc->connection;
 506         int ret;
 507
 508         request.intf1_id = intf1_id;
 509         request.cport1_id = cpu_to_le16(cport1_id);
 510         request.intf2_id = intf2_id;
 511         request.cport2_id = cpu_to_le16(cport2_id);
 512
 513         ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
 514                                 &request, sizeof(request), NULL, 0);
 515         if (ret) {
 516                 dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n",
 517                                 intf1_id, cport1_id, intf2_id, cport2_id, ret);
 518         }
 519 }
 520
 521 /* Creates bi-directional routes between the devices */
 522 int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
 523                                u8 intf2_id, u8 dev2_id)
 524 {
 525         struct gb_svc_route_create_request request;
 526
 527         request.intf1_id = intf1_id;
 528         request.dev1_id = dev1_id;
 529         request.intf2_id = intf2_id;
 530         request.dev2_id = dev2_id;
 531
 532         return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
 533                                  &request, sizeof(request), NULL, 0);
 534 }
 535
 536 /* Destroys bi-directional routes between the devices */
 537 void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
 538 {
 539         struct gb_svc_route_destroy_request request;
 540         int ret;
 541
 542         request.intf1_id = intf1_id;
 543         request.intf2_id = intf2_id;
 544
 545         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
 546                                 &request, sizeof(request), NULL, 0);
 547         if (ret) {
 548                 dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
 549                                 intf1_id, intf2_id, ret);
 550         }
 551 }
 552
 553 int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
 554                                u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
 555                                u8 tx_amplitude, u8 tx_hs_equalizer,
 556                                u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
 557                                u8 flags, u32 quirks,
 558                                struct gb_svc_l2_timer_cfg *local,
 559                                struct gb_svc_l2_timer_cfg *remote)
 560 {
 561         struct gb_svc_intf_set_pwrm_request request;
 562         struct gb_svc_intf_set_pwrm_response response;
 563         int ret;
 564         u16 result_code;
 565
 566         memset(&request, 0, sizeof(request));
 567
 568         request.intf_id = intf_id;
 569         request.hs_series = hs_series;
 570         request.tx_mode = tx_mode;
 571         request.tx_gear = tx_gear;
 572         request.tx_nlanes = tx_nlanes;
 573         request.tx_amplitude = tx_amplitude;
 574         request.tx_hs_equalizer = tx_hs_equalizer;
 575         request.rx_mode = rx_mode;
 576         request.rx_gear = rx_gear;
 577         request.rx_nlanes = rx_nlanes;
 578         request.flags = flags;
 579         request.quirks = cpu_to_le32(quirks);
 580         if (local)
 581                 request.local_l2timerdata = *local;
 582         if (remote)
 583                 request.remote_l2timerdata = *remote;
 584
 585         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 586                                 &request, sizeof(request),
 587                                 &response, sizeof(response));
 588         if (ret < 0)
 589                 return ret;
 590
 591         result_code = response.result_code;
 592         if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) {
 593                 dev_err(&svc->dev, "set power mode = %d\n", result_code);
 594                 return -EIO;
 595         }
 596
 597         return 0;
 598 }
 599 EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
 600
 601 int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id)
 602 {
 603         struct gb_svc_intf_set_pwrm_request request;
 604         struct gb_svc_intf_set_pwrm_response response;
 605         int ret;
 606         u16 result_code;
 607
 608         memset(&request, 0, sizeof(request));
 609
 610         request.intf_id = intf_id;
 611         request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A;
 612         request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 613         request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 614
 615         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 616                                 &request, sizeof(request),
 617                                 &response, sizeof(response));
 618         if (ret < 0) {
 619                 dev_err(&svc->dev,
 620                         "failed to send set power mode operation to interface %u: %d\n",
 621                         intf_id, ret);
 622                 return ret;
 623         }
 624
 625         result_code = response.result_code;
 626         if (result_code != GB_SVC_SETPWRM_PWR_OK) {
 627                 dev_err(&svc->dev,
 628                         "failed to hibernate the link for interface %u: %u\n",
 629                         intf_id, result_code);
 630                 return -EIO;
 631         }
 632
 633         return 0;
 634 }
 635
 636 int gb_svc_ping(struct gb_svc *svc)
 637 {
 638         return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
 639                                          NULL, 0, NULL, 0,
 640                                          GB_OPERATION_TIMEOUT_DEFAULT * 2);
 641 }
 642
 643 static int gb_svc_version_request(struct gb_operation *op)
 644 {
 645         struct gb_connection *connection = op->connection;
 646         struct gb_svc *svc = gb_connection_get_data(connection);
 647         struct gb_svc_version_request *request;
 648         struct gb_svc_version_response *response;
 649
 650         if (op->request->payload_size < sizeof(*request)) {
 651                 dev_err(&svc->dev, "short version request (%zu < %zu)\n",
 652                                 op->request->payload_size,
 653                                 sizeof(*request));
 654                 return -EINVAL;
 655         }
 656
 657         request = op->request->payload;
 658
 659         if (request->major > GB_SVC_VERSION_MAJOR) {
 660                 dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
 661                                 request->major, GB_SVC_VERSION_MAJOR);
 662                 return -ENOTSUPP;
 663         }
 664
 665         svc->protocol_major = request->major;
 666         svc->protocol_minor = request->minor;
 667
 668         if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
 669                 return -ENOMEM;
 670
 671         response = op->response->payload;
 672         response->major = svc->protocol_major;
 673         response->minor = svc->protocol_minor;
 674
 675         return 0;
 676 }
 677
 678 static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf,
 679                                         size_t len, loff_t *offset)
 680 {
 681         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 682                 file_inode(file)->i_private;
 683         struct gb_svc *svc = pwrmon_rails->svc;
 684         int ret, desc;
 685         u32 value;
 686         char buff[16];
 687
 688         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 689                                        GB_SVC_PWRMON_TYPE_VOL, &value);
 690         if (ret) {
 691                 dev_err(&svc->dev,
 692                         "failed to get voltage sample %u: %d\n",
 693                         pwrmon_rails->id, ret);
 694                 return ret;
 695         }
 696
 697         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 698
 699         return simple_read_from_buffer(buf, len, offset, buff, desc);
 700 }
 701
 702 static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf,
 703                                         size_t len, loff_t *offset)
 704 {
 705         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 706                 file_inode(file)->i_private;
 707         struct gb_svc *svc = pwrmon_rails->svc;
 708         int ret, desc;
 709         u32 value;
 710         char buff[16];
 711
 712         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 713                                        GB_SVC_PWRMON_TYPE_CURR, &value);
 714         if (ret) {
 715                 dev_err(&svc->dev,
 716                         "failed to get current sample %u: %d\n",
 717                         pwrmon_rails->id, ret);
 718                 return ret;
 719         }
 720
 721         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 722
 723         return simple_read_from_buffer(buf, len, offset, buff, desc);
 724 }
 725
 726 static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf,
 727                                       size_t len, loff_t *offset)
 728 {
 729         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 730                 file_inode(file)->i_private;
 731         struct gb_svc *svc = pwrmon_rails->svc;
 732         int ret, desc;
 733         u32 value;
 734         char buff[16];
 735
 736         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 737                                        GB_SVC_PWRMON_TYPE_PWR, &value);
 738         if (ret) {
 739                 dev_err(&svc->dev, "failed to get power sample %u: %d\n",
 740                         pwrmon_rails->id, ret);
 741                 return ret;
 742         }
 743
 744         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 745
 746         return simple_read_from_buffer(buf, len, offset, buff, desc);
 747 }
 748
 749 static const struct file_operations pwrmon_debugfs_voltage_fops = {
 750         .read           = pwr_debugfs_voltage_read,
 751 };
 752
 753 static const struct file_operations pwrmon_debugfs_current_fops = {
 754         .read           = pwr_debugfs_current_read,
 755 };
 756
 757 static const struct file_operations pwrmon_debugfs_power_fops = {
 758         .read           = pwr_debugfs_power_read,
 759 };
 760
 761 static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc)
 762 {
 763         int i;
 764         size_t bufsize;
 765         struct dentry *dent;
 766         struct gb_svc_pwrmon_rail_names_get_response *rail_names;
 767         u8 rail_count;
 768
 769         dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry);
 770         if (IS_ERR_OR_NULL(dent))
 771                 return;
 772
 773         if (gb_svc_pwrmon_rail_count_get(svc, &rail_count))
 774                 goto err_pwrmon_debugfs;
 775
 776         if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT)
 777                 goto err_pwrmon_debugfs;
 778
 779         bufsize = sizeof(*rail_names) +
 780                 GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count;
 781
 782         rail_names = kzalloc(bufsize, GFP_KERNEL);
 783         if (!rail_names)
 784                 goto err_pwrmon_debugfs;
 785
 786         svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails),
 787                                     GFP_KERNEL);
 788         if (!svc->pwrmon_rails)
 789                 goto err_pwrmon_debugfs_free;
 790
 791         if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize))
 792                 goto err_pwrmon_debugfs_free;
 793
 794         for (i = 0; i < rail_count; i++) {
 795                 struct dentry *dir;
 796                 struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i];
 797                 char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE];
 798
 799                 snprintf(fname, sizeof(fname), "%s",
 800                          (char *)&rail_names->name[i]);
 801
 802                 rail->id = i;
 803                 rail->svc = svc;
 804
 805                 dir = debugfs_create_dir(fname, dent);
 806                 debugfs_create_file("voltage_now", 0444, dir, rail,
 807                                     &pwrmon_debugfs_voltage_fops);
 808                 debugfs_create_file("current_now", 0444, dir, rail,
 809                                     &pwrmon_debugfs_current_fops);
 810                 debugfs_create_file("power_now", 0444, dir, rail,
 811                                     &pwrmon_debugfs_power_fops);
 812         }
 813
 814         kfree(rail_names);
 815         return;
 816
 817 err_pwrmon_debugfs_free:
 818         kfree(rail_names);
 819         kfree(svc->pwrmon_rails);
 820         svc->pwrmon_rails = NULL;
 821
 822 err_pwrmon_debugfs:
 823         debugfs_remove(dent);
 824 }
 825
 826 static void gb_svc_debugfs_init(struct gb_svc *svc)
 827 {
 828         svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev),
 829                                                  gb_debugfs_get());
 830         gb_svc_pwrmon_debugfs_init(svc);
 831 }
 832
 833 static void gb_svc_debugfs_exit(struct gb_svc *svc)
 834 {
 835         debugfs_remove_recursive(svc->debugfs_dentry);
 836         kfree(svc->pwrmon_rails);
 837         svc->pwrmon_rails = NULL;
 838 }
 839
 840 static int gb_svc_hello(struct gb_operation *op)
 841 {
 842         struct gb_connection *connection = op->connection;
 843         struct gb_svc *svc = gb_connection_get_data(connection);
 844         struct gb_svc_hello_request *hello_request;
 845         int ret;
 846
 847         if (op->request->payload_size < sizeof(*hello_request)) {
 848                 dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
 849                                 op->request->payload_size,
 850                                 sizeof(*hello_request));
 851                 return -EINVAL;
 852         }
 853
 854         hello_request = op->request->payload;
 855         svc->endo_id = le16_to_cpu(hello_request->endo_id);
 856         svc->ap_intf_id = hello_request->interface_id;
 857
 858         ret = device_add(&svc->dev);
 859         if (ret) {
 860                 dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
 861                 return ret;
 862         }
 863
 864         ret = gb_svc_watchdog_create(svc);
 865         if (ret) {
 866                 dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
 867                 goto err_unregister_device;
 868         }
 869
 870         gb_svc_debugfs_init(svc);
 871
 872         return gb_svc_queue_deferred_request(op);
 873
 874 err_unregister_device:
 875         gb_svc_watchdog_destroy(svc);
 876         device_del(&svc->dev);
 877         return ret;
 878 }
 879
 880 static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
 881                                                         u8 intf_id)
 882 {
 883         struct gb_host_device *hd = svc->hd;
 884         struct gb_module *module;
 885         size_t num_interfaces;
 886         u8 module_id;
 887
 888         list_for_each_entry(module, &hd->modules, hd_node) {
 889                 module_id = module->module_id;
 890                 num_interfaces = module->num_interfaces;
 891
 892                 if (intf_id >= module_id &&
 893                                 intf_id < module_id + num_interfaces) {
 894                         return module->interfaces[intf_id - module_id];
 895                 }
 896         }
 897
 898         return NULL;
 899 }
 900
 901 static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
 902 {
 903         struct gb_host_device *hd = svc->hd;
 904         struct gb_module *module;
 905
 906         list_for_each_entry(module, &hd->modules, hd_node) {
 907                 if (module->module_id == module_id)
 908                         return module;
 909         }
 910
 911         return NULL;
 912 }
 913
 914 static void gb_svc_process_hello_deferred(struct gb_operation *operation)
 915 {
 916         struct gb_connection *connection = operation->connection;
 917         struct gb_svc *svc = gb_connection_get_data(connection);
 918         int ret;
 919
 920         /*
 921          * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch
 922          * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient
 923          * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged
 924          * module.
 925          *
 926          * The code should be removed once SW-2217, Heuristic for UniPro
 927          * Power Mode Changes is resolved.
 928          */
 929         ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
 930                                          GB_SVC_UNIPRO_HS_SERIES_A,
 931                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 932                                          2, 1,
 933                                          GB_SVC_SMALL_AMPLITUDE,
 934                                          GB_SVC_NO_DE_EMPHASIS,
 935                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 936                                          2, 1,
 937                                          0, 0,
 938                                          NULL, NULL);
 939
 940         if (ret)
 941                 dev_warn(&svc->dev,
 942                         "power mode change failed on AP to switch link: %d\n",
 943                         ret);
 944 }
 945
 946 static void gb_svc_process_module_inserted(struct gb_operation *operation)
 947 {
 948         struct gb_svc_module_inserted_request *request;
 949         struct gb_connection *connection = operation->connection;
 950         struct gb_svc *svc = gb_connection_get_data(connection);
 951         struct gb_host_device *hd = svc->hd;
 952         struct gb_module *module;
 953         size_t num_interfaces;
 954         u8 module_id;
 955         u16 flags;
 956         int ret;
 957
 958         /* The request message size has already been verified. */
 959         request = operation->request->payload;
 960         module_id = request->primary_intf_id;
 961         num_interfaces = request->intf_count;
 962         flags = le16_to_cpu(request->flags);
 963
 964         dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n",
 965                         __func__, module_id, num_interfaces, flags);
 966
 967         if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) {
 968                 dev_warn(&svc->dev, "no primary interface detected on module %u\n",
 969                                 module_id);
 970         }
 971
 972         module = gb_svc_module_lookup(svc, module_id);
 973         if (module) {
 974                 dev_warn(&svc->dev, "unexpected module-inserted event %u\n",
 975                                 module_id);
 976                 return;
 977         }
 978
 979         module = gb_module_create(hd, module_id, num_interfaces);
 980         if (!module) {
 981                 dev_err(&svc->dev, "failed to create module\n");
 982                 return;
 983         }
 984
 985         ret = gb_module_add(module);
 986         if (ret) {
 987                 gb_module_put(module);
 988                 return;
 989         }
 990
 991         list_add(&module->hd_node, &hd->modules);
 992 }
 993
 994 static void gb_svc_process_module_removed(struct gb_operation *operation)
 995 {
 996         struct gb_svc_module_removed_request *request;
 997         struct gb_connection *connection = operation->connection;
 998         struct gb_svc *svc = gb_connection_get_data(connection);
 999         struct gb_module *module;
1000         u8 module_id;
1001
1002         /* The request message size has already been verified. */
1003         request = operation->request->payload;
1004         module_id = request->primary_intf_id;
1005
1006         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id);
1007
1008         module = gb_svc_module_lookup(svc, module_id);
1009         if (!module) {
1010                 dev_warn(&svc->dev, "unexpected module-removed event %u\n",
1011                                 module_id);
1012                 return;
1013         }
1014
1015         module->disconnected = true;
1016
1017         gb_module_del(module);
1018         list_del(&module->hd_node);
1019         gb_module_put(module);
1020 }
1021
1022 static void gb_svc_process_intf_oops(struct gb_operation *operation)
1023 {
1024         struct gb_svc_intf_oops_request *request;
1025         struct gb_connection *connection = operation->connection;
1026         struct gb_svc *svc = gb_connection_get_data(connection);
1027         struct gb_interface *intf;
1028         u8 intf_id;
1029         u8 reason;
1030
1031         /* The request message size has already been verified. */
1032         request = operation->request->payload;
1033         intf_id = request->intf_id;
1034         reason = request->reason;
1035
1036         intf = gb_svc_interface_lookup(svc, intf_id);
1037         if (!intf) {
1038                 dev_warn(&svc->dev, "unexpected interface-oops event %u\n",
1039                          intf_id);
1040                 return;
1041         }
1042
1043         dev_info(&svc->dev, "Deactivating interface %u, interface oops reason = %u\n",
1044                  intf_id, reason);
1045
1046         mutex_lock(&intf->mutex);
1047         intf->disconnected = true;
1048         gb_interface_disable(intf);
1049         gb_interface_deactivate(intf);
1050         mutex_unlock(&intf->mutex);
1051 }
1052
1053 static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
1054 {
1055         struct gb_svc_intf_mailbox_event_request *request;
1056         struct gb_connection *connection = operation->connection;
1057         struct gb_svc *svc = gb_connection_get_data(connection);
1058         struct gb_interface *intf;
1059         u8 intf_id;
1060         u16 result_code;
1061         u32 mailbox;
1062
1063         /* The request message size has already been verified. */
1064         request = operation->request->payload;
1065         intf_id = request->intf_id;
1066         result_code = le16_to_cpu(request->result_code);
1067         mailbox = le32_to_cpu(request->mailbox);
1068
1069         dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
1070                         __func__, intf_id, result_code, mailbox);
1071
1072         intf = gb_svc_interface_lookup(svc, intf_id);
1073         if (!intf) {
1074                 dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
1075                 return;
1076         }
1077
1078         gb_interface_mailbox_event(intf, result_code, mailbox);
1079 }
1080
1081 static void gb_svc_process_deferred_request(struct work_struct *work)
1082 {
1083         struct gb_svc_deferred_request *dr;
1084         struct gb_operation *operation;
1085         struct gb_svc *svc;
1086         u8 type;
1087
1088         dr = container_of(work, struct gb_svc_deferred_request, work);
1089         operation = dr->operation;
1090         svc = gb_connection_get_data(operation->connection);
1091         type = operation->request->header->type;
1092
1093         switch (type) {
1094         case GB_SVC_TYPE_SVC_HELLO:
1095                 gb_svc_process_hello_deferred(operation);
1096                 break;
1097         case GB_SVC_TYPE_MODULE_INSERTED:
1098                 gb_svc_process_module_inserted(operation);
1099                 break;
1100         case GB_SVC_TYPE_MODULE_REMOVED:
1101                 gb_svc_process_module_removed(operation);
1102                 break;
1103         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1104                 gb_svc_process_intf_mailbox_event(operation);
1105                 break;
1106         case GB_SVC_TYPE_INTF_OOPS:
1107                 gb_svc_process_intf_oops(operation);
1108                 break;
1109         default:
1110                 dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
1111         }
1112
1113         gb_operation_put(operation);
1114         kfree(dr);
1115 }
1116
1117 static int gb_svc_queue_deferred_request(struct gb_operation *operation)
1118 {
1119         struct gb_svc *svc = gb_connection_get_data(operation->connection);
1120         struct gb_svc_deferred_request *dr;
1121
1122         dr = kmalloc(sizeof(*dr), GFP_KERNEL);
1123         if (!dr)
1124                 return -ENOMEM;
1125
1126         gb_operation_get(operation);
1127
1128         dr->operation = operation;
1129         INIT_WORK(&dr->work, gb_svc_process_deferred_request);
1130
1131         queue_work(svc->wq, &dr->work);
1132
1133         return 0;
1134 }
1135
1136 static int gb_svc_intf_reset_recv(struct gb_operation *op)
1137 {
1138         struct gb_svc *svc = gb_connection_get_data(op->connection);
1139         struct gb_message *request = op->request;
1140         struct gb_svc_intf_reset_request *reset;
1141         u8 intf_id;
1142
1143         if (request->payload_size < sizeof(*reset)) {
1144                 dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
1145                                 request->payload_size, sizeof(*reset));
1146                 return -EINVAL;
1147         }
1148         reset = request->payload;
1149
1150         intf_id = reset->intf_id;
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 }