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/kstrtox.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/greybus.h>
  13
  14 #define SVC_INTF_EJECT_TIMEOUT          9000
  15 #define SVC_INTF_ACTIVATE_TIMEOUT       6000
  16 #define SVC_INTF_RESUME_TIMEOUT         3000
  17
  18 struct gb_svc_deferred_request {
  19         struct work_struct work;
  20         struct gb_operation *operation;
  21 };
  22
  23 static int gb_svc_queue_deferred_request(struct gb_operation *operation);
  24
  25 static ssize_t endo_id_show(struct device *dev,
  26                             struct device_attribute *attr, char *buf)
  27 {
  28         struct gb_svc *svc = to_gb_svc(dev);
  29
  30         return sprintf(buf, "0x%04x\n", svc->endo_id);
  31 }
  32 static DEVICE_ATTR_RO(endo_id);
  33
  34 static ssize_t ap_intf_id_show(struct device *dev,
  35                                struct device_attribute *attr, char *buf)
  36 {
  37         struct gb_svc *svc = to_gb_svc(dev);
  38
  39         return sprintf(buf, "%u\n", svc->ap_intf_id);
  40 }
  41 static DEVICE_ATTR_RO(ap_intf_id);
  42
  43 // FIXME
  44 // This is a hack, we need to do this "right" and clean the interface up
  45 // properly, not just forcibly yank the thing out of the system and hope for the
  46 // best.  But for now, people want their modules to come out without having to
  47 // throw the thing to the ground or get out a screwdriver.
  48 static ssize_t intf_eject_store(struct device *dev,
  49                                 struct device_attribute *attr, const char *buf,
  50                                 size_t len)
  51 {
  52         struct gb_svc *svc = to_gb_svc(dev);
  53         unsigned short intf_id;
  54         int ret;
  55
  56         ret = kstrtou16(buf, 10, &intf_id);
  57         if (ret < 0)
  58                 return ret;
  59
  60         dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
  61
  62         ret = gb_svc_intf_eject(svc, intf_id);
  63         if (ret < 0)
  64                 return ret;
  65
  66         return len;
  67 }
  68 static DEVICE_ATTR_WO(intf_eject);
  69
  70 static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr,
  71                              char *buf)
  72 {
  73         struct gb_svc *svc = to_gb_svc(dev);
  74
  75         return sprintf(buf, "%s\n",
  76                        gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled");
  77 }
  78
  79 static ssize_t watchdog_store(struct device *dev,
  80                               struct device_attribute *attr, const char *buf,
  81                               size_t len)
  82 {
  83         struct gb_svc *svc = to_gb_svc(dev);
  84         int retval;
  85         bool user_request;
  86
  87         retval = kstrtobool(buf, &user_request);
  88         if (retval)
  89                 return retval;
  90
  91         if (user_request)
  92                 retval = gb_svc_watchdog_enable(svc);
  93         else
  94                 retval = gb_svc_watchdog_disable(svc);
  95         if (retval)
  96                 return retval;
  97         return len;
  98 }
  99 static DEVICE_ATTR_RW(watchdog);
 100
 101 static ssize_t watchdog_action_show(struct device *dev,
 102                                     struct device_attribute *attr, char *buf)
 103 {
 104         struct gb_svc *svc = to_gb_svc(dev);
 105
 106         if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL)
 107                 return sprintf(buf, "panic\n");
 108         else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO)
 109                 return sprintf(buf, "reset\n");
 110
 111         return -EINVAL;
 112 }
 113
 114 static ssize_t watchdog_action_store(struct device *dev,
 115                                      struct device_attribute *attr,
 116                                      const char *buf, size_t len)
 117 {
 118         struct gb_svc *svc = to_gb_svc(dev);
 119
 120         if (sysfs_streq(buf, "panic"))
 121                 svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL;
 122         else if (sysfs_streq(buf, "reset"))
 123                 svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO;
 124         else
 125                 return -EINVAL;
 126
 127         return len;
 128 }
 129 static DEVICE_ATTR_RW(watchdog_action);
 130
 131 static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value)
 132 {
 133         struct gb_svc_pwrmon_rail_count_get_response response;
 134         int ret;
 135
 136         ret = gb_operation_sync(svc->connection,
 137                                 GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0,
 138                                 &response, sizeof(response));
 139         if (ret) {
 140                 dev_err(&svc->dev, "failed to get rail count: %d\n", ret);
 141                 return ret;
 142         }
 143
 144         *value = response.rail_count;
 145
 146         return 0;
 147 }
 148
 149 static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc,
 150                 struct gb_svc_pwrmon_rail_names_get_response *response,
 151                 size_t bufsize)
 152 {
 153         int ret;
 154
 155         ret = gb_operation_sync(svc->connection,
 156                                 GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0,
 157                                 response, bufsize);
 158         if (ret) {
 159                 dev_err(&svc->dev, "failed to get rail names: %d\n", ret);
 160                 return ret;
 161         }
 162
 163         if (response->status != GB_SVC_OP_SUCCESS) {
 164                 dev_err(&svc->dev,
 165                         "SVC error while getting rail names: %u\n",
 166                         response->status);
 167                 return -EREMOTEIO;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id,
 174                                     u8 measurement_type, u32 *value)
 175 {
 176         struct gb_svc_pwrmon_sample_get_request request;
 177         struct gb_svc_pwrmon_sample_get_response response;
 178         int ret;
 179
 180         request.rail_id = rail_id;
 181         request.measurement_type = measurement_type;
 182
 183         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET,
 184                                 &request, sizeof(request),
 185                                 &response, sizeof(response));
 186         if (ret) {
 187                 dev_err(&svc->dev, "failed to get rail sample: %d\n", ret);
 188                 return ret;
 189         }
 190
 191         if (response.result) {
 192                 dev_err(&svc->dev,
 193                         "UniPro error while getting rail power sample (%d %d): %d\n",
 194                         rail_id, measurement_type, response.result);
 195                 switch (response.result) {
 196                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 197                         return -EINVAL;
 198                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 199                         return -ENOMSG;
 200                 default:
 201                         return -EREMOTEIO;
 202                 }
 203         }
 204
 205         *value = le32_to_cpu(response.measurement);
 206
 207         return 0;
 208 }
 209
 210 int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
 211                                   u8 measurement_type, u32 *value)
 212 {
 213         struct gb_svc_pwrmon_intf_sample_get_request request;
 214         struct gb_svc_pwrmon_intf_sample_get_response response;
 215         int ret;
 216
 217         request.intf_id = intf_id;
 218         request.measurement_type = measurement_type;
 219
 220         ret = gb_operation_sync(svc->connection,
 221                                 GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET,
 222                                 &request, sizeof(request),
 223                                 &response, sizeof(response));
 224         if (ret) {
 225                 dev_err(&svc->dev, "failed to get intf sample: %d\n", ret);
 226                 return ret;
 227         }
 228
 229         if (response.result) {
 230                 dev_err(&svc->dev,
 231                         "UniPro error while getting intf power sample (%d %d): %d\n",
 232                         intf_id, measurement_type, response.result);
 233                 switch (response.result) {
 234                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 235                         return -EINVAL;
 236                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 237                         return -ENOMSG;
 238                 default:
 239                         return -EREMOTEIO;
 240                 }
 241         }
 242
 243         *value = le32_to_cpu(response.measurement);
 244
 245         return 0;
 246 }
 247
 248 static struct attribute *svc_attrs[] = {
 249         &dev_attr_endo_id.attr,
 250         &dev_attr_ap_intf_id.attr,
 251         &dev_attr_intf_eject.attr,
 252         &dev_attr_watchdog.attr,
 253         &dev_attr_watchdog_action.attr,
 254         NULL,
 255 };
 256 ATTRIBUTE_GROUPS(svc);
 257
 258 int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
 259 {
 260         struct gb_svc_intf_device_id_request request;
 261
 262         request.intf_id = intf_id;
 263         request.device_id = device_id;
 264
 265         return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
 266                                  &request, sizeof(request), NULL, 0);
 267 }
 268
 269 int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
 270 {
 271         struct gb_svc_intf_eject_request request;
 272         int ret;
 273
 274         request.intf_id = intf_id;
 275
 276         /*
 277          * The pulse width for module release in svc is long so we need to
 278          * increase the timeout so the operation will not return to soon.
 279          */
 280         ret = gb_operation_sync_timeout(svc->connection,
 281                                         GB_SVC_TYPE_INTF_EJECT, &request,
 282                                         sizeof(request), NULL, 0,
 283                                         SVC_INTF_EJECT_TIMEOUT);
 284         if (ret) {
 285                 dev_err(&svc->dev, "failed to eject interface %u\n", intf_id);
 286                 return ret;
 287         }
 288
 289         return 0;
 290 }
 291
 292 int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable)
 293 {
 294         struct gb_svc_intf_vsys_request request;
 295         struct gb_svc_intf_vsys_response response;
 296         int type, ret;
 297
 298         request.intf_id = intf_id;
 299
 300         if (enable)
 301                 type = GB_SVC_TYPE_INTF_VSYS_ENABLE;
 302         else
 303                 type = GB_SVC_TYPE_INTF_VSYS_DISABLE;
 304
 305         ret = gb_operation_sync(svc->connection, type,
 306                                 &request, sizeof(request),
 307                                 &response, sizeof(response));
 308         if (ret < 0)
 309                 return ret;
 310         if (response.result_code != GB_SVC_INTF_VSYS_OK)
 311                 return -EREMOTEIO;
 312         return 0;
 313 }
 314
 315 int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable)
 316 {
 317         struct gb_svc_intf_refclk_request request;
 318         struct gb_svc_intf_refclk_response response;
 319         int type, ret;
 320
 321         request.intf_id = intf_id;
 322
 323         if (enable)
 324                 type = GB_SVC_TYPE_INTF_REFCLK_ENABLE;
 325         else
 326                 type = GB_SVC_TYPE_INTF_REFCLK_DISABLE;
 327
 328         ret = gb_operation_sync(svc->connection, type,
 329                                 &request, sizeof(request),
 330                                 &response, sizeof(response));
 331         if (ret < 0)
 332                 return ret;
 333         if (response.result_code != GB_SVC_INTF_REFCLK_OK)
 334                 return -EREMOTEIO;
 335         return 0;
 336 }
 337
 338 int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
 339 {
 340         struct gb_svc_intf_unipro_request request;
 341         struct gb_svc_intf_unipro_response response;
 342         int type, ret;
 343
 344         request.intf_id = intf_id;
 345
 346         if (enable)
 347                 type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE;
 348         else
 349                 type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE;
 350
 351         ret = gb_operation_sync(svc->connection, type,
 352                                 &request, sizeof(request),
 353                                 &response, sizeof(response));
 354         if (ret < 0)
 355                 return ret;
 356         if (response.result_code != GB_SVC_INTF_UNIPRO_OK)
 357                 return -EREMOTEIO;
 358         return 0;
 359 }
 360
 361 int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
 362 {
 363         struct gb_svc_intf_activate_request request;
 364         struct gb_svc_intf_activate_response response;
 365         int ret;
 366
 367         request.intf_id = intf_id;
 368
 369         ret = gb_operation_sync_timeout(svc->connection,
 370                                         GB_SVC_TYPE_INTF_ACTIVATE,
 371                                         &request, sizeof(request),
 372                                         &response, sizeof(response),
 373                                         SVC_INTF_ACTIVATE_TIMEOUT);
 374         if (ret < 0)
 375                 return ret;
 376         if (response.status != GB_SVC_OP_SUCCESS) {
 377                 dev_err(&svc->dev, "failed to activate interface %u: %u\n",
 378                         intf_id, response.status);
 379                 return -EREMOTEIO;
 380         }
 381
 382         *intf_type = response.intf_type;
 383
 384         return 0;
 385 }
 386
 387 int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id)
 388 {
 389         struct gb_svc_intf_resume_request request;
 390         struct gb_svc_intf_resume_response response;
 391         int ret;
 392
 393         request.intf_id = intf_id;
 394
 395         ret = gb_operation_sync_timeout(svc->connection,
 396                                         GB_SVC_TYPE_INTF_RESUME,
 397                                         &request, sizeof(request),
 398                                         &response, sizeof(response),
 399                                         SVC_INTF_RESUME_TIMEOUT);
 400         if (ret < 0) {
 401                 dev_err(&svc->dev, "failed to send interface resume %u: %d\n",
 402                         intf_id, ret);
 403                 return ret;
 404         }
 405
 406         if (response.status != GB_SVC_OP_SUCCESS) {
 407                 dev_err(&svc->dev, "failed to resume interface %u: %u\n",
 408                         intf_id, response.status);
 409                 return -EREMOTEIO;
 410         }
 411
 412         return 0;
 413 }
 414
 415 int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 416                         u32 *value)
 417 {
 418         struct gb_svc_dme_peer_get_request request;
 419         struct gb_svc_dme_peer_get_response response;
 420         u16 result;
 421         int ret;
 422
 423         request.intf_id = intf_id;
 424         request.attr = cpu_to_le16(attr);
 425         request.selector = cpu_to_le16(selector);
 426
 427         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
 428                                 &request, sizeof(request),
 429                                 &response, sizeof(response));
 430         if (ret) {
 431                 dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n",
 432                         intf_id, attr, selector, ret);
 433                 return ret;
 434         }
 435
 436         result = le16_to_cpu(response.result_code);
 437         if (result) {
 438                 dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n",
 439                         intf_id, attr, selector, result);
 440                 return -EREMOTEIO;
 441         }
 442
 443         if (value)
 444                 *value = le32_to_cpu(response.attr_value);
 445
 446         return 0;
 447 }
 448
 449 int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 450                         u32 value)
 451 {
 452         struct gb_svc_dme_peer_set_request request;
 453         struct gb_svc_dme_peer_set_response response;
 454         u16 result;
 455         int ret;
 456
 457         request.intf_id = intf_id;
 458         request.attr = cpu_to_le16(attr);
 459         request.selector = cpu_to_le16(selector);
 460         request.value = cpu_to_le32(value);
 461
 462         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
 463                                 &request, sizeof(request),
 464                                 &response, sizeof(response));
 465         if (ret) {
 466                 dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n",
 467                         intf_id, attr, selector, value, ret);
 468                 return ret;
 469         }
 470
 471         result = le16_to_cpu(response.result_code);
 472         if (result) {
 473                 dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n",
 474                         intf_id, attr, selector, value, result);
 475                 return -EREMOTEIO;
 476         }
 477
 478         return 0;
 479 }
 480
 481 int gb_svc_connection_create(struct gb_svc *svc,
 482                              u8 intf1_id, u16 cport1_id,
 483                              u8 intf2_id, u16 cport2_id,
 484                              u8 cport_flags)
 485 {
 486         struct gb_svc_conn_create_request request;
 487
 488         request.intf1_id = intf1_id;
 489         request.cport1_id = cpu_to_le16(cport1_id);
 490         request.intf2_id = intf2_id;
 491         request.cport2_id = cpu_to_le16(cport2_id);
 492         request.tc = 0;         /* TC0 */
 493         request.flags = cport_flags;
 494
 495         return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
 496                                  &request, sizeof(request), NULL, 0);
 497 }
 498
 499 void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
 500                                u8 intf2_id, u16 cport2_id)
 501 {
 502         struct gb_svc_conn_destroy_request request;
 503         struct gb_connection *connection = svc->connection;
 504         int ret;
 505
 506         request.intf1_id = intf1_id;
 507         request.cport1_id = cpu_to_le16(cport1_id);
 508         request.intf2_id = intf2_id;
 509         request.cport2_id = cpu_to_le16(cport2_id);
 510
 511         ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
 512                                 &request, sizeof(request), NULL, 0);
 513         if (ret) {
 514                 dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n",
 515                         intf1_id, cport1_id, intf2_id, cport2_id, ret);
 516         }
 517 }
 518
 519 /* Creates bi-directional routes between the devices */
 520 int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
 521                         u8 intf2_id, u8 dev2_id)
 522 {
 523         struct gb_svc_route_create_request request;
 524
 525         request.intf1_id = intf1_id;
 526         request.dev1_id = dev1_id;
 527         request.intf2_id = intf2_id;
 528         request.dev2_id = dev2_id;
 529
 530         return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
 531                                  &request, sizeof(request), NULL, 0);
 532 }
 533
 534 /* Destroys bi-directional routes between the devices */
 535 void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
 536 {
 537         struct gb_svc_route_destroy_request request;
 538         int ret;
 539
 540         request.intf1_id = intf1_id;
 541         request.intf2_id = intf2_id;
 542
 543         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
 544                                 &request, sizeof(request), NULL, 0);
 545         if (ret) {
 546                 dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
 547                         intf1_id, intf2_id, ret);
 548         }
 549 }
 550
 551 int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
 552                                u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
 553                                u8 tx_amplitude, u8 tx_hs_equalizer,
 554                                u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
 555                                u8 flags, u32 quirks,
 556                                struct gb_svc_l2_timer_cfg *local,
 557                                struct gb_svc_l2_timer_cfg *remote)
 558 {
 559         struct gb_svc_intf_set_pwrm_request request;
 560         struct gb_svc_intf_set_pwrm_response response;
 561         int ret;
 562         u16 result_code;
 563
 564         memset(&request, 0, sizeof(request));
 565
 566         request.intf_id = intf_id;
 567         request.hs_series = hs_series;
 568         request.tx_mode = tx_mode;
 569         request.tx_gear = tx_gear;
 570         request.tx_nlanes = tx_nlanes;
 571         request.tx_amplitude = tx_amplitude;
 572         request.tx_hs_equalizer = tx_hs_equalizer;
 573         request.rx_mode = rx_mode;
 574         request.rx_gear = rx_gear;
 575         request.rx_nlanes = rx_nlanes;
 576         request.flags = flags;
 577         request.quirks = cpu_to_le32(quirks);
 578         if (local)
 579                 request.local_l2timerdata = *local;
 580         if (remote)
 581                 request.remote_l2timerdata = *remote;
 582
 583         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 584                                 &request, sizeof(request),
 585                                 &response, sizeof(response));
 586         if (ret < 0)
 587                 return ret;
 588
 589         result_code = response.result_code;
 590         if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) {
 591                 dev_err(&svc->dev, "set power mode = %d\n", result_code);
 592                 return -EIO;
 593         }
 594
 595         return 0;
 596 }
 597 EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
 598
 599 int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id)
 600 {
 601         struct gb_svc_intf_set_pwrm_request request;
 602         struct gb_svc_intf_set_pwrm_response response;
 603         int ret;
 604         u16 result_code;
 605
 606         memset(&request, 0, sizeof(request));
 607
 608         request.intf_id = intf_id;
 609         request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A;
 610         request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 611         request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 612
 613         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 614                                 &request, sizeof(request),
 615                                 &response, sizeof(response));
 616         if (ret < 0) {
 617                 dev_err(&svc->dev,
 618                         "failed to send set power mode operation to interface %u: %d\n",
 619                         intf_id, ret);
 620                 return ret;
 621         }
 622
 623         result_code = response.result_code;
 624         if (result_code != GB_SVC_SETPWRM_PWR_OK) {
 625                 dev_err(&svc->dev,
 626                         "failed to hibernate the link for interface %u: %u\n",
 627                         intf_id, result_code);
 628                 return -EIO;
 629         }
 630
 631         return 0;
 632 }
 633
 634 int gb_svc_ping(struct gb_svc *svc)
 635 {
 636         return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
 637                                          NULL, 0, NULL, 0,
 638                                          GB_OPERATION_TIMEOUT_DEFAULT * 2);
 639 }
 640
 641 static int gb_svc_version_request(struct gb_operation *op)
 642 {
 643         struct gb_connection *connection = op->connection;
 644         struct gb_svc *svc = gb_connection_get_data(connection);
 645         struct gb_svc_version_request *request;
 646         struct gb_svc_version_response *response;
 647
 648         if (op->request->payload_size < sizeof(*request)) {
 649                 dev_err(&svc->dev, "short version request (%zu < %zu)\n",
 650                         op->request->payload_size,
 651                         sizeof(*request));
 652                 return -EINVAL;
 653         }
 654
 655         request = op->request->payload;
 656
 657         if (request->major > GB_SVC_VERSION_MAJOR) {
 658                 dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
 659                          request->major, GB_SVC_VERSION_MAJOR);
 660                 return -ENOTSUPP;
 661         }
 662
 663         svc->protocol_major = request->major;
 664         svc->protocol_minor = request->minor;
 665
 666         if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
 667                 return -ENOMEM;
 668
 669         response = op->response->payload;
 670         response->major = svc->protocol_major;
 671         response->minor = svc->protocol_minor;
 672
 673         return 0;
 674 }
 675
 676 static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf,
 677                                         size_t len, loff_t *offset)
 678 {
 679         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 680                 file_inode(file)->i_private;
 681         struct gb_svc *svc = pwrmon_rails->svc;
 682         int ret, desc;
 683         u32 value;
 684         char buff[16];
 685
 686         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 687                                        GB_SVC_PWRMON_TYPE_VOL, &value);
 688         if (ret) {
 689                 dev_err(&svc->dev,
 690                         "failed to get voltage sample %u: %d\n",
 691                         pwrmon_rails->id, ret);
 692                 return ret;
 693         }
 694
 695         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 696
 697         return simple_read_from_buffer(buf, len, offset, buff, desc);
 698 }
 699
 700 static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf,
 701                                         size_t len, loff_t *offset)
 702 {
 703         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 704                 file_inode(file)->i_private;
 705         struct gb_svc *svc = pwrmon_rails->svc;
 706         int ret, desc;
 707         u32 value;
 708         char buff[16];
 709
 710         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 711                                        GB_SVC_PWRMON_TYPE_CURR, &value);
 712         if (ret) {
 713                 dev_err(&svc->dev,
 714                         "failed to get current sample %u: %d\n",
 715                         pwrmon_rails->id, ret);
 716                 return ret;
 717         }
 718
 719         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 720
 721         return simple_read_from_buffer(buf, len, offset, buff, desc);
 722 }
 723
 724 static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf,
 725                                       size_t len, loff_t *offset)
 726 {
 727         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 728                 file_inode(file)->i_private;
 729         struct gb_svc *svc = pwrmon_rails->svc;
 730         int ret, desc;
 731         u32 value;
 732         char buff[16];
 733
 734         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 735                                        GB_SVC_PWRMON_TYPE_PWR, &value);
 736         if (ret) {
 737                 dev_err(&svc->dev, "failed to get power sample %u: %d\n",
 738                         pwrmon_rails->id, ret);
 739                 return ret;
 740         }
 741
 742         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 743
 744         return simple_read_from_buffer(buf, len, offset, buff, desc);
 745 }
 746
 747 static const struct file_operations pwrmon_debugfs_voltage_fops = {
 748         .read           = pwr_debugfs_voltage_read,
 749 };
 750
 751 static const struct file_operations pwrmon_debugfs_current_fops = {
 752         .read           = pwr_debugfs_current_read,
 753 };
 754
 755 static const struct file_operations pwrmon_debugfs_power_fops = {
 756         .read           = pwr_debugfs_power_read,
 757 };
 758
 759 static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc)
 760 {
 761         int i;
 762         size_t bufsize;
 763         struct dentry *dent;
 764         struct gb_svc_pwrmon_rail_names_get_response *rail_names;
 765         u8 rail_count;
 766
 767         dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry);
 768         if (IS_ERR_OR_NULL(dent))
 769                 return;
 770
 771         if (gb_svc_pwrmon_rail_count_get(svc, &rail_count))
 772                 goto err_pwrmon_debugfs;
 773
 774         if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT)
 775                 goto err_pwrmon_debugfs;
 776
 777         bufsize = sizeof(*rail_names) +
 778                 GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count;
 779
 780         rail_names = kzalloc(bufsize, GFP_KERNEL);
 781         if (!rail_names)
 782                 goto err_pwrmon_debugfs;
 783
 784         svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails),
 785                                     GFP_KERNEL);
 786         if (!svc->pwrmon_rails)
 787                 goto err_pwrmon_debugfs_free;
 788
 789         if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize))
 790                 goto err_pwrmon_debugfs_free;
 791
 792         for (i = 0; i < rail_count; i++) {
 793                 struct dentry *dir;
 794                 struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i];
 795                 char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE];
 796
 797                 snprintf(fname, sizeof(fname), "%s",
 798                          (char *)&rail_names->name[i]);
 799
 800                 rail->id = i;
 801                 rail->svc = svc;
 802
 803                 dir = debugfs_create_dir(fname, dent);
 804                 debugfs_create_file("voltage_now", 0444, dir, rail,
 805                                     &pwrmon_debugfs_voltage_fops);
 806                 debugfs_create_file("current_now", 0444, dir, rail,
 807                                     &pwrmon_debugfs_current_fops);
 808                 debugfs_create_file("power_now", 0444, dir, rail,
 809                                     &pwrmon_debugfs_power_fops);
 810         }
 811
 812         kfree(rail_names);
 813         return;
 814
 815 err_pwrmon_debugfs_free:
 816         kfree(rail_names);
 817         kfree(svc->pwrmon_rails);
 818         svc->pwrmon_rails = NULL;
 819
 820 err_pwrmon_debugfs:
 821         debugfs_remove(dent);
 822 }
 823
 824 static void gb_svc_debugfs_init(struct gb_svc *svc)
 825 {
 826         svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev),
 827                                                  gb_debugfs_get());
 828         gb_svc_pwrmon_debugfs_init(svc);
 829 }
 830
 831 static void gb_svc_debugfs_exit(struct gb_svc *svc)
 832 {
 833         debugfs_remove_recursive(svc->debugfs_dentry);
 834         kfree(svc->pwrmon_rails);
 835         svc->pwrmon_rails = NULL;
 836 }
 837
 838 static int gb_svc_hello(struct gb_operation *op)
 839 {
 840         struct gb_connection *connection = op->connection;
 841         struct gb_svc *svc = gb_connection_get_data(connection);
 842         struct gb_svc_hello_request *hello_request;
 843         int ret;
 844
 845         if (op->request->payload_size < sizeof(*hello_request)) {
 846                 dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
 847                          op->request->payload_size,
 848                          sizeof(*hello_request));
 849                 return -EINVAL;
 850         }
 851
 852         hello_request = op->request->payload;
 853         svc->endo_id = le16_to_cpu(hello_request->endo_id);
 854         svc->ap_intf_id = hello_request->interface_id;
 855
 856         ret = device_add(&svc->dev);
 857         if (ret) {
 858                 dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
 859                 return ret;
 860         }
 861
 862         ret = gb_svc_watchdog_create(svc);
 863         if (ret) {
 864                 dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
 865                 goto err_deregister_svc;
 866         }
 867
 868         /*
 869          * FIXME: This is a temporary hack to reconfigure the link at HELLO
 870          * (which abuses the deferred request processing mechanism).
 871          */
 872         ret = gb_svc_queue_deferred_request(op);
 873         if (ret)
 874                 goto err_destroy_watchdog;
 875
 876         gb_svc_debugfs_init(svc);
 877
 878         return 0;
 879
 880 err_destroy_watchdog:
 881         gb_svc_watchdog_destroy(svc);
 882 err_deregister_svc:
 883         device_del(&svc->dev);
 884
 885         return ret;
 886 }
 887
 888 static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
 889                                                     u8 intf_id)
 890 {
 891         struct gb_host_device *hd = svc->hd;
 892         struct gb_module *module;
 893         size_t num_interfaces;
 894         u8 module_id;
 895
 896         list_for_each_entry(module, &hd->modules, hd_node) {
 897                 module_id = module->module_id;
 898                 num_interfaces = module->num_interfaces;
 899
 900                 if (intf_id >= module_id &&
 901                     intf_id < module_id + num_interfaces) {
 902                         return module->interfaces[intf_id - module_id];
 903                 }
 904         }
 905
 906         return NULL;
 907 }
 908
 909 static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
 910 {
 911         struct gb_host_device *hd = svc->hd;
 912         struct gb_module *module;
 913
 914         list_for_each_entry(module, &hd->modules, hd_node) {
 915                 if (module->module_id == module_id)
 916                         return module;
 917         }
 918
 919         return NULL;
 920 }
 921
 922 static void gb_svc_process_hello_deferred(struct gb_operation *operation)
 923 {
 924         struct gb_connection *connection = operation->connection;
 925         struct gb_svc *svc = gb_connection_get_data(connection);
 926         int ret;
 927
 928         /*
 929          * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch
 930          * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient
 931          * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged
 932          * module.
 933          *
 934          * The code should be removed once SW-2217, Heuristic for UniPro
 935          * Power Mode Changes is resolved.
 936          */
 937         ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
 938                                          GB_SVC_UNIPRO_HS_SERIES_A,
 939                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 940                                          2, 1,
 941                                          GB_SVC_SMALL_AMPLITUDE,
 942                                          GB_SVC_NO_DE_EMPHASIS,
 943                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 944                                          2, 1,
 945                                          0, 0,
 946                                          NULL, NULL);
 947
 948         if (ret)
 949                 dev_warn(&svc->dev,
 950                          "power mode change failed on AP to switch link: %d\n",
 951                          ret);
 952 }
 953
 954 static void gb_svc_process_module_inserted(struct gb_operation *operation)
 955 {
 956         struct gb_svc_module_inserted_request *request;
 957         struct gb_connection *connection = operation->connection;
 958         struct gb_svc *svc = gb_connection_get_data(connection);
 959         struct gb_host_device *hd = svc->hd;
 960         struct gb_module *module;
 961         size_t num_interfaces;
 962         u8 module_id;
 963         u16 flags;
 964         int ret;
 965
 966         /* The request message size has already been verified. */
 967         request = operation->request->payload;
 968         module_id = request->primary_intf_id;
 969         num_interfaces = request->intf_count;
 970         flags = le16_to_cpu(request->flags);
 971
 972         dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n",
 973                 __func__, module_id, num_interfaces, flags);
 974
 975         if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) {
 976                 dev_warn(&svc->dev, "no primary interface detected on module %u\n",
 977                          module_id);
 978         }
 979
 980         module = gb_svc_module_lookup(svc, module_id);
 981         if (module) {
 982                 dev_warn(&svc->dev, "unexpected module-inserted event %u\n",
 983                          module_id);
 984                 return;
 985         }
 986
 987         module = gb_module_create(hd, module_id, num_interfaces);
 988         if (!module) {
 989                 dev_err(&svc->dev, "failed to create module\n");
 990                 return;
 991         }
 992
 993         ret = gb_module_add(module);
 994         if (ret) {
 995                 gb_module_put(module);
 996                 return;
 997         }
 998
 999         list_add(&module->hd_node, &hd->modules);
1000 }
1001
1002 static void gb_svc_process_module_removed(struct gb_operation *operation)
1003 {
1004         struct gb_svc_module_removed_request *request;
1005         struct gb_connection *connection = operation->connection;
1006         struct gb_svc *svc = gb_connection_get_data(connection);
1007         struct gb_module *module;
1008         u8 module_id;
1009
1010         /* The request message size has already been verified. */
1011         request = operation->request->payload;
1012         module_id = request->primary_intf_id;
1013
1014         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id);
1015
1016         module = gb_svc_module_lookup(svc, module_id);
1017         if (!module) {
1018                 dev_warn(&svc->dev, "unexpected module-removed event %u\n",
1019                          module_id);
1020                 return;
1021         }
1022
1023         module->disconnected = true;
1024
1025         gb_module_del(module);
1026         list_del(&module->hd_node);
1027         gb_module_put(module);
1028 }
1029
1030 static void gb_svc_process_intf_oops(struct gb_operation *operation)
1031 {
1032         struct gb_svc_intf_oops_request *request;
1033         struct gb_connection *connection = operation->connection;
1034         struct gb_svc *svc = gb_connection_get_data(connection);
1035         struct gb_interface *intf;
1036         u8 intf_id;
1037         u8 reason;
1038
1039         /* The request message size has already been verified. */
1040         request = operation->request->payload;
1041         intf_id = request->intf_id;
1042         reason = request->reason;
1043
1044         intf = gb_svc_interface_lookup(svc, intf_id);
1045         if (!intf) {
1046                 dev_warn(&svc->dev, "unexpected interface-oops event %u\n",
1047                          intf_id);
1048                 return;
1049         }
1050
1051         dev_info(&svc->dev, "Deactivating interface %u, interface oops reason = %u\n",
1052                  intf_id, reason);
1053
1054         mutex_lock(&intf->mutex);
1055         intf->disconnected = true;
1056         gb_interface_disable(intf);
1057         gb_interface_deactivate(intf);
1058         mutex_unlock(&intf->mutex);
1059 }
1060
1061 static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
1062 {
1063         struct gb_svc_intf_mailbox_event_request *request;
1064         struct gb_connection *connection = operation->connection;
1065         struct gb_svc *svc = gb_connection_get_data(connection);
1066         struct gb_interface *intf;
1067         u8 intf_id;
1068         u16 result_code;
1069         u32 mailbox;
1070
1071         /* The request message size has already been verified. */
1072         request = operation->request->payload;
1073         intf_id = request->intf_id;
1074         result_code = le16_to_cpu(request->result_code);
1075         mailbox = le32_to_cpu(request->mailbox);
1076
1077         dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
1078                 __func__, intf_id, result_code, mailbox);
1079
1080         intf = gb_svc_interface_lookup(svc, intf_id);
1081         if (!intf) {
1082                 dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
1083                 return;
1084         }
1085
1086         gb_interface_mailbox_event(intf, result_code, mailbox);
1087 }
1088
1089 static void gb_svc_process_deferred_request(struct work_struct *work)
1090 {
1091         struct gb_svc_deferred_request *dr;
1092         struct gb_operation *operation;
1093         struct gb_svc *svc;
1094         u8 type;
1095
1096         dr = container_of(work, struct gb_svc_deferred_request, work);
1097         operation = dr->operation;
1098         svc = gb_connection_get_data(operation->connection);
1099         type = operation->request->header->type;
1100
1101         switch (type) {
1102         case GB_SVC_TYPE_SVC_HELLO:
1103                 gb_svc_process_hello_deferred(operation);
1104                 break;
1105         case GB_SVC_TYPE_MODULE_INSERTED:
1106                 gb_svc_process_module_inserted(operation);
1107                 break;
1108         case GB_SVC_TYPE_MODULE_REMOVED:
1109                 gb_svc_process_module_removed(operation);
1110                 break;
1111         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1112                 gb_svc_process_intf_mailbox_event(operation);
1113                 break;
1114         case GB_SVC_TYPE_INTF_OOPS:
1115                 gb_svc_process_intf_oops(operation);
1116                 break;
1117         default:
1118                 dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
1119         }
1120
1121         gb_operation_put(operation);
1122         kfree(dr);
1123 }
1124
1125 static int gb_svc_queue_deferred_request(struct gb_operation *operation)
1126 {
1127         struct gb_svc *svc = gb_connection_get_data(operation->connection);
1128         struct gb_svc_deferred_request *dr;
1129
1130         dr = kmalloc(sizeof(*dr), GFP_KERNEL);
1131         if (!dr)
1132                 return -ENOMEM;
1133
1134         gb_operation_get(operation);
1135
1136         dr->operation = operation;
1137         INIT_WORK(&dr->work, gb_svc_process_deferred_request);
1138
1139         queue_work(svc->wq, &dr->work);
1140
1141         return 0;
1142 }
1143
1144 static int gb_svc_intf_reset_recv(struct gb_operation *op)
1145 {
1146         struct gb_svc *svc = gb_connection_get_data(op->connection);
1147         struct gb_message *request = op->request;
1148         struct gb_svc_intf_reset_request *reset;
1149
1150         if (request->payload_size < sizeof(*reset)) {
1151                 dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
1152                          request->payload_size, sizeof(*reset));
1153                 return -EINVAL;
1154         }
1155         reset = request->payload;
1156
1157         /* FIXME Reset the interface here */
1158
1159         return 0;
1160 }
1161
1162 static int gb_svc_module_inserted_recv(struct gb_operation *op)
1163 {
1164         struct gb_svc *svc = gb_connection_get_data(op->connection);
1165         struct gb_svc_module_inserted_request *request;
1166
1167         if (op->request->payload_size < sizeof(*request)) {
1168                 dev_warn(&svc->dev, "short module-inserted request received (%zu < %zu)\n",
1169                          op->request->payload_size, sizeof(*request));
1170                 return -EINVAL;
1171         }
1172
1173         request = op->request->payload;
1174
1175         dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1176                 request->primary_intf_id);
1177
1178         return gb_svc_queue_deferred_request(op);
1179 }
1180
1181 static int gb_svc_module_removed_recv(struct gb_operation *op)
1182 {
1183         struct gb_svc *svc = gb_connection_get_data(op->connection);
1184         struct gb_svc_module_removed_request *request;
1185
1186         if (op->request->payload_size < sizeof(*request)) {
1187                 dev_warn(&svc->dev, "short module-removed request received (%zu < %zu)\n",
1188                          op->request->payload_size, sizeof(*request));
1189                 return -EINVAL;
1190         }
1191
1192         request = op->request->payload;
1193
1194         dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1195                 request->primary_intf_id);
1196
1197         return gb_svc_queue_deferred_request(op);
1198 }
1199
1200 static int gb_svc_intf_oops_recv(struct gb_operation *op)
1201 {
1202         struct gb_svc *svc = gb_connection_get_data(op->connection);
1203         struct gb_svc_intf_oops_request *request;
1204
1205         if (op->request->payload_size < sizeof(*request)) {
1206                 dev_warn(&svc->dev, "short intf-oops request received (%zu < %zu)\n",
1207                          op->request->payload_size, sizeof(*request));
1208                 return -EINVAL;
1209         }
1210
1211         return gb_svc_queue_deferred_request(op);
1212 }
1213
1214 static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op)
1215 {
1216         struct gb_svc *svc = gb_connection_get_data(op->connection);
1217         struct gb_svc_intf_mailbox_event_request *request;
1218
1219         if (op->request->payload_size < sizeof(*request)) {
1220                 dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n",
1221                          op->request->payload_size, sizeof(*request));
1222                 return -EINVAL;
1223         }
1224
1225         request = op->request->payload;
1226
1227         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
1228
1229         return gb_svc_queue_deferred_request(op);
1230 }
1231
1232 static int gb_svc_request_handler(struct gb_operation *op)
1233 {
1234         struct gb_connection *connection = op->connection;
1235         struct gb_svc *svc = gb_connection_get_data(connection);
1236         u8 type = op->type;
1237         int ret = 0;
1238
1239         /*
1240          * SVC requests need to follow a specific order (at least initially) and
1241          * below code takes care of enforcing that. The expected order is:
1242          * - PROTOCOL_VERSION
1243          * - SVC_HELLO
1244          * - Any other request, but the earlier two.
1245          *
1246          * Incoming requests are guaranteed to be serialized and so we don't
1247          * need to protect 'state' for any races.
1248          */
1249         switch (type) {
1250         case GB_SVC_TYPE_PROTOCOL_VERSION:
1251                 if (svc->state != GB_SVC_STATE_RESET)
1252                         ret = -EINVAL;
1253                 break;
1254         case GB_SVC_TYPE_SVC_HELLO:
1255                 if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
1256                         ret = -EINVAL;
1257                 break;
1258         default:
1259                 if (svc->state != GB_SVC_STATE_SVC_HELLO)
1260                         ret = -EINVAL;
1261                 break;
1262         }
1263
1264         if (ret) {
1265                 dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
1266                          type, svc->state);
1267                 return ret;
1268         }
1269
1270         switch (type) {
1271         case GB_SVC_TYPE_PROTOCOL_VERSION:
1272                 ret = gb_svc_version_request(op);
1273                 if (!ret)
1274                         svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
1275                 return ret;
1276         case GB_SVC_TYPE_SVC_HELLO:
1277                 ret = gb_svc_hello(op);
1278                 if (!ret)
1279                         svc->state = GB_SVC_STATE_SVC_HELLO;
1280                 return ret;
1281         case GB_SVC_TYPE_INTF_RESET:
1282                 return gb_svc_intf_reset_recv(op);
1283         case GB_SVC_TYPE_MODULE_INSERTED:
1284                 return gb_svc_module_inserted_recv(op);
1285         case GB_SVC_TYPE_MODULE_REMOVED:
1286                 return gb_svc_module_removed_recv(op);
1287         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1288                 return gb_svc_intf_mailbox_event_recv(op);
1289         case GB_SVC_TYPE_INTF_OOPS:
1290                 return gb_svc_intf_oops_recv(op);
1291         default:
1292                 dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
1293                 return -EINVAL;
1294         }
1295 }
1296
1297 static void gb_svc_release(struct device *dev)
1298 {
1299         struct gb_svc *svc = to_gb_svc(dev);
1300
1301         if (svc->connection)
1302                 gb_connection_destroy(svc->connection);
1303         ida_destroy(&svc->device_id_map);
1304         destroy_workqueue(svc->wq);
1305         kfree(svc);
1306 }
1307
1308 const struct device_type greybus_svc_type = {
1309         .name           = "greybus_svc",
1310         .release        = gb_svc_release,
1311 };
1312
1313 struct gb_svc *gb_svc_create(struct gb_host_device *hd)
1314 {
1315         struct gb_svc *svc;
1316
1317         svc = kzalloc(sizeof(*svc), GFP_KERNEL);
1318         if (!svc)
1319                 return NULL;
1320
1321         svc->wq = alloc_ordered_workqueue("%s:svc", 0, dev_name(&hd->dev));
1322         if (!svc->wq) {
1323                 kfree(svc);
1324                 return NULL;
1325         }
1326
1327         svc->dev.parent = &hd->dev;
1328         svc->dev.bus = &greybus_bus_type;
1329         svc->dev.type = &greybus_svc_type;
1330         svc->dev.groups = svc_groups;
1331         svc->dev.dma_mask = svc->dev.parent->dma_mask;
1332         device_initialize(&svc->dev);
1333
1334         dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
1335
1336         ida_init(&svc->device_id_map);
1337         svc->state = GB_SVC_STATE_RESET;
1338         svc->hd = hd;
1339
1340         svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
1341                                                       gb_svc_request_handler);
1342         if (IS_ERR(svc->connection)) {
1343                 dev_err(&svc->dev, "failed to create connection: %ld\n",
1344                         PTR_ERR(svc->connection));
1345                 goto err_put_device;
1346         }
1347
1348         gb_connection_set_data(svc->connection, svc);
1349
1350         return svc;
1351
1352 err_put_device:
1353         put_device(&svc->dev);
1354         return NULL;
1355 }
1356
1357 int gb_svc_add(struct gb_svc *svc)
1358 {
1359         int ret;
1360
1361         /*
1362          * The SVC protocol is currently driven by the SVC, so the SVC device
1363          * is added from the connection request handler when enough
1364          * information has been received.
1365          */
1366         ret = gb_connection_enable(svc->connection);
1367         if (ret)
1368                 return ret;
1369
1370         return 0;
1371 }
1372
1373 static void gb_svc_remove_modules(struct gb_svc *svc)
1374 {
1375         struct gb_host_device *hd = svc->hd;
1376         struct gb_module *module, *tmp;
1377
1378         list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) {
1379                 gb_module_del(module);
1380                 list_del(&module->hd_node);
1381                 gb_module_put(module);
1382         }
1383 }
1384
1385 void gb_svc_del(struct gb_svc *svc)
1386 {
1387         gb_connection_disable_rx(svc->connection);
1388
1389         /*
1390          * The SVC device may have been registered from the request handler.
1391          */
1392         if (device_is_registered(&svc->dev)) {
1393                 gb_svc_debugfs_exit(svc);
1394                 gb_svc_watchdog_destroy(svc);
1395                 device_del(&svc->dev);
1396         }
1397
1398         flush_workqueue(svc->wq);
1399
1400         gb_svc_remove_modules(svc);
1401
1402         gb_connection_disable(svc->connection);
1403 }
1404
1405 void gb_svc_put(struct gb_svc *svc)
1406 {
1407         put_device(&svc->dev);
1408 }