drivers/staging/greybus/svc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * SVC Greybus driver.
   4  *
   5  * Copyright 2015 Google Inc.
   6  * Copyright 2015 Linaro Ltd.
   7  */
   8
   9 #include <linux/debugfs.h>
  10 #include <linux/workqueue.h>
  11
  12 #include "greybus.h"
  13
  14 #define SVC_INTF_EJECT_TIMEOUT          9000
  15 #define SVC_INTF_ACTIVATE_TIMEOUT       6000
  16 #define SVC_INTF_RESUME_TIMEOUT         3000
  17
  18 struct gb_svc_deferred_request {
  19         struct work_struct work;
  20         struct gb_operation *operation;
  21 };
  22
  23
  24 static int gb_svc_queue_deferred_request(struct gb_operation *operation);
  25
  26 static ssize_t endo_id_show(struct device *dev,
  27                         struct device_attribute *attr, char *buf)
  28 {
  29         struct gb_svc *svc = to_gb_svc(dev);
  30
  31         return sprintf(buf, "0x%04x\n", svc->endo_id);
  32 }
  33 static DEVICE_ATTR_RO(endo_id);
  34
  35 static ssize_t ap_intf_id_show(struct device *dev,
  36                         struct device_attribute *attr, char *buf)
  37 {
  38         struct gb_svc *svc = to_gb_svc(dev);
  39
  40         return sprintf(buf, "%u\n", svc->ap_intf_id);
  41 }
  42 static DEVICE_ATTR_RO(ap_intf_id);
  43
  44 // FIXME
  45 // This is a hack, we need to do this "right" and clean the interface up
  46 // properly, not just forcibly yank the thing out of the system and hope for the
  47 // best.  But for now, people want their modules to come out without having to
  48 // throw the thing to the ground or get out a screwdriver.
  49 static ssize_t intf_eject_store(struct device *dev,
  50                                 struct device_attribute *attr, const char *buf,
  51                                 size_t len)
  52 {
  53         struct gb_svc *svc = to_gb_svc(dev);
  54         unsigned short intf_id;
  55         int ret;
  56
  57         ret = kstrtou16(buf, 10, &intf_id);
  58         if (ret < 0)
  59                 return ret;
  60
  61         dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
  62
  63         ret = gb_svc_intf_eject(svc, intf_id);
  64         if (ret < 0)
  65                 return ret;
  66
  67         return len;
  68 }
  69 static DEVICE_ATTR_WO(intf_eject);
  70
  71 static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr,
  72                              char *buf)
  73 {
  74         struct gb_svc *svc = to_gb_svc(dev);
  75
  76         return sprintf(buf, "%s\n",
  77                        gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled");
  78 }
  79
  80 static ssize_t watchdog_store(struct device *dev,
  81                               struct device_attribute *attr, const char *buf,
  82                               size_t len)
  83 {
  84         struct gb_svc *svc = to_gb_svc(dev);
  85         int retval;
  86         bool user_request;
  87
  88         retval = strtobool(buf, &user_request);
  89         if (retval)
  90                 return retval;
  91
  92         if (user_request)
  93                 retval = gb_svc_watchdog_enable(svc);
  94         else
  95                 retval = gb_svc_watchdog_disable(svc);
  96         if (retval)
  97                 return retval;
  98         return len;
  99 }
 100 static DEVICE_ATTR_RW(watchdog);
 101
 102 static ssize_t watchdog_action_show(struct device *dev,
 103                                     struct device_attribute *attr, char *buf)
 104 {
 105         struct gb_svc *svc = to_gb_svc(dev);
 106
 107         if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL)
 108                 return sprintf(buf, "panic\n");
 109         else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO)
 110                 return sprintf(buf, "reset\n");
 111
 112         return -EINVAL;
 113 }
 114
 115 static ssize_t watchdog_action_store(struct device *dev,
 116                                      struct device_attribute *attr,
 117                                      const char *buf, size_t len)
 118 {
 119         struct gb_svc *svc = to_gb_svc(dev);
 120
 121         if (sysfs_streq(buf, "panic"))
 122                 svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL;
 123         else if (sysfs_streq(buf, "reset"))
 124                 svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO;
 125         else
 126                 return -EINVAL;
 127
 128         return len;
 129 }
 130 static DEVICE_ATTR_RW(watchdog_action);
 131
 132 static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value)
 133 {
 134         struct gb_svc_pwrmon_rail_count_get_response response;
 135         int ret;
 136
 137         ret = gb_operation_sync(svc->connection,
 138                                 GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0,
 139                                 &response, sizeof(response));
 140         if (ret) {
 141                 dev_err(&svc->dev, "failed to get rail count: %d\n", ret);
 142                 return ret;
 143         }
 144
 145         *value = response.rail_count;
 146
 147         return 0;
 148 }
 149
 150 static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc,
 151                 struct gb_svc_pwrmon_rail_names_get_response *response,
 152                 size_t bufsize)
 153 {
 154         int ret;
 155
 156         ret = gb_operation_sync(svc->connection,
 157                                 GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0,
 158                                 response, bufsize);
 159         if (ret) {
 160                 dev_err(&svc->dev, "failed to get rail names: %d\n", ret);
 161                 return ret;
 162         }
 163
 164         if (response->status != GB_SVC_OP_SUCCESS) {
 165                 dev_err(&svc->dev,
 166                         "SVC error while getting rail names: %u\n",
 167                         response->status);
 168                 return -EREMOTEIO;
 169         }
 170
 171         return 0;
 172 }
 173
 174 static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id,
 175                                     u8 measurement_type, u32 *value)
 176 {
 177         struct gb_svc_pwrmon_sample_get_request request;
 178         struct gb_svc_pwrmon_sample_get_response response;
 179         int ret;
 180
 181         request.rail_id = rail_id;
 182         request.measurement_type = measurement_type;
 183
 184         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET,
 185                                 &request, sizeof(request),
 186                                 &response, sizeof(response));
 187         if (ret) {
 188                 dev_err(&svc->dev, "failed to get rail sample: %d\n", ret);
 189                 return ret;
 190         }
 191
 192         if (response.result) {
 193                 dev_err(&svc->dev,
 194                         "UniPro error while getting rail power sample (%d %d): %d\n",
 195                         rail_id, measurement_type, response.result);
 196                 switch (response.result) {
 197                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 198                         return -EINVAL;
 199                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 200                         return -ENOMSG;
 201                 default:
 202                         return -EREMOTEIO;
 203                 }
 204         }
 205
 206         *value = le32_to_cpu(response.measurement);
 207
 208         return 0;
 209 }
 210
 211 int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
 212                                   u8 measurement_type, u32 *value)
 213 {
 214         struct gb_svc_pwrmon_intf_sample_get_request request;
 215         struct gb_svc_pwrmon_intf_sample_get_response response;
 216         int ret;
 217
 218         request.intf_id = intf_id;
 219         request.measurement_type = measurement_type;
 220
 221         ret = gb_operation_sync(svc->connection,
 222                                 GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET,
 223                                 &request, sizeof(request),
 224                                 &response, sizeof(response));
 225         if (ret) {
 226                 dev_err(&svc->dev, "failed to get intf sample: %d\n", ret);
 227                 return ret;
 228         }
 229
 230         if (response.result) {
 231                 dev_err(&svc->dev,
 232                         "UniPro error while getting intf power sample (%d %d): %d\n",
 233                         intf_id, measurement_type, response.result);
 234                 switch (response.result) {
 235                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 236                         return -EINVAL;
 237                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 238                         return -ENOMSG;
 239                 default:
 240                         return -EREMOTEIO;
 241                 }
 242         }
 243
 244         *value = le32_to_cpu(response.measurement);
 245
 246         return 0;
 247 }
 248
 249 static struct attribute *svc_attrs[] = {
 250         &dev_attr_endo_id.attr,
 251         &dev_attr_ap_intf_id.attr,
 252         &dev_attr_intf_eject.attr,
 253         &dev_attr_watchdog.attr,
 254         &dev_attr_watchdog_action.attr,
 255         NULL,
 256 };
 257 ATTRIBUTE_GROUPS(svc);
 258
 259 int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
 260 {
 261         struct gb_svc_intf_device_id_request request;
 262
 263         request.intf_id = intf_id;
 264         request.device_id = device_id;
 265
 266         return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
 267                                  &request, sizeof(request), NULL, 0);
 268 }
 269
 270 int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
 271 {
 272         struct gb_svc_intf_eject_request request;
 273         int ret;
 274
 275         request.intf_id = intf_id;
 276
 277         /*
 278          * The pulse width for module release in svc is long so we need to
 279          * increase the timeout so the operation will not return to soon.
 280          */
 281         ret = gb_operation_sync_timeout(svc->connection,
 282                                         GB_SVC_TYPE_INTF_EJECT, &request,
 283                                         sizeof(request), NULL, 0,
 284                                         SVC_INTF_EJECT_TIMEOUT);
 285         if (ret) {
 286                 dev_err(&svc->dev, "failed to eject interface %u\n", intf_id);
 287                 return ret;
 288         }
 289
 290         return 0;
 291 }
 292
 293 int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable)
 294 {
 295         struct gb_svc_intf_vsys_request request;
 296         struct gb_svc_intf_vsys_response response;
 297         int type, ret;
 298
 299         request.intf_id = intf_id;
 300
 301         if (enable)
 302                 type = GB_SVC_TYPE_INTF_VSYS_ENABLE;
 303         else
 304                 type = GB_SVC_TYPE_INTF_VSYS_DISABLE;
 305
 306         ret = gb_operation_sync(svc->connection, type,
 307                         &request, sizeof(request),
 308                         &response, sizeof(response));
 309         if (ret < 0)
 310                 return ret;
 311         if (response.result_code != GB_SVC_INTF_VSYS_OK)
 312                 return -EREMOTEIO;
 313         return 0;
 314 }
 315
 316 int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable)
 317 {
 318         struct gb_svc_intf_refclk_request request;
 319         struct gb_svc_intf_refclk_response response;
 320         int type, ret;
 321
 322         request.intf_id = intf_id;
 323
 324         if (enable)
 325                 type = GB_SVC_TYPE_INTF_REFCLK_ENABLE;
 326         else
 327                 type = GB_SVC_TYPE_INTF_REFCLK_DISABLE;
 328
 329         ret = gb_operation_sync(svc->connection, type,
 330                         &request, sizeof(request),
 331                         &response, sizeof(response));
 332         if (ret < 0)
 333                 return ret;
 334         if (response.result_code != GB_SVC_INTF_REFCLK_OK)
 335                 return -EREMOTEIO;
 336         return 0;
 337 }
 338
 339 int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
 340 {
 341         struct gb_svc_intf_unipro_request request;
 342         struct gb_svc_intf_unipro_response response;
 343         int type, ret;
 344
 345         request.intf_id = intf_id;
 346
 347         if (enable)
 348                 type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE;
 349         else
 350                 type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE;
 351
 352         ret = gb_operation_sync(svc->connection, type,
 353                         &request, sizeof(request),
 354                         &response, sizeof(response));
 355         if (ret < 0)
 356                 return ret;
 357         if (response.result_code != GB_SVC_INTF_UNIPRO_OK)
 358                 return -EREMOTEIO;
 359         return 0;
 360 }
 361
 362 int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
 363 {
 364         struct gb_svc_intf_activate_request request;
 365         struct gb_svc_intf_activate_response response;
 366         int ret;
 367
 368         request.intf_id = intf_id;
 369
 370         ret = gb_operation_sync_timeout(svc->connection,
 371                         GB_SVC_TYPE_INTF_ACTIVATE,
 372                         &request, sizeof(request),
 373                         &response, sizeof(response),
 374                         SVC_INTF_ACTIVATE_TIMEOUT);
 375         if (ret < 0)
 376                 return ret;
 377         if (response.status != GB_SVC_OP_SUCCESS) {
 378                 dev_err(&svc->dev, "failed to activate interface %u: %u\n",
 379                                 intf_id, response.status);
 380                 return -EREMOTEIO;
 381         }
 382
 383         *intf_type = response.intf_type;
 384
 385         return 0;
 386 }
 387
 388 int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id)
 389 {
 390         struct gb_svc_intf_resume_request request;
 391         struct gb_svc_intf_resume_response response;
 392         int ret;
 393
 394         request.intf_id = intf_id;
 395
 396         ret = gb_operation_sync_timeout(svc->connection,
 397                                         GB_SVC_TYPE_INTF_RESUME,
 398                                         &request, sizeof(request),
 399                                         &response, sizeof(response),
 400                                         SVC_INTF_RESUME_TIMEOUT);
 401         if (ret < 0) {
 402                 dev_err(&svc->dev, "failed to send interface resume %u: %d\n",
 403                         intf_id, ret);
 404                 return ret;
 405         }
 406
 407         if (response.status != GB_SVC_OP_SUCCESS) {
 408                 dev_err(&svc->dev, "failed to resume interface %u: %u\n",
 409                         intf_id, response.status);
 410                 return -EREMOTEIO;
 411         }
 412
 413         return 0;
 414 }
 415
 416 int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 417                         u32 *value)
 418 {
 419         struct gb_svc_dme_peer_get_request request;
 420         struct gb_svc_dme_peer_get_response response;
 421         u16 result;
 422         int ret;
 423
 424         request.intf_id = intf_id;
 425         request.attr = cpu_to_le16(attr);
 426         request.selector = cpu_to_le16(selector);
 427
 428         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
 429                                 &request, sizeof(request),
 430                                 &response, sizeof(response));
 431         if (ret) {
 432                 dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n",
 433                                 intf_id, attr, selector, ret);
 434                 return ret;
 435         }
 436
 437         result = le16_to_cpu(response.result_code);
 438         if (result) {
 439                 dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n",
 440                                 intf_id, attr, selector, result);
 441                 return -EREMOTEIO;
 442         }
 443
 444         if (value)
 445                 *value = le32_to_cpu(response.attr_value);
 446
 447         return 0;
 448 }
 449
 450 int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 451                         u32 value)
 452 {
 453         struct gb_svc_dme_peer_set_request request;
 454         struct gb_svc_dme_peer_set_response response;
 455         u16 result;
 456         int ret;
 457
 458         request.intf_id = intf_id;
 459         request.attr = cpu_to_le16(attr);
 460         request.selector = cpu_to_le16(selector);
 461         request.value = cpu_to_le32(value);
 462
 463         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
 464                                 &request, sizeof(request),
 465                                 &response, sizeof(response));
 466         if (ret) {
 467                 dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n",
 468                                 intf_id, attr, selector, value, ret);
 469                 return ret;
 470         }
 471
 472         result = le16_to_cpu(response.result_code);
 473         if (result) {
 474                 dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n",
 475                                 intf_id, attr, selector, value, result);
 476                 return -EREMOTEIO;
 477         }
 478
 479         return 0;
 480 }
 481
 482 int gb_svc_connection_create(struct gb_svc *svc,
 483                                 u8 intf1_id, u16 cport1_id,
 484                                 u8 intf2_id, u16 cport2_id,
 485                                 u8 cport_flags)
 486 {
 487         struct gb_svc_conn_create_request request;
 488
 489         request.intf1_id = intf1_id;
 490         request.cport1_id = cpu_to_le16(cport1_id);
 491         request.intf2_id = intf2_id;
 492         request.cport2_id = cpu_to_le16(cport2_id);
 493         request.tc = 0;         /* TC0 */
 494         request.flags = cport_flags;
 495
 496         return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
 497                                  &request, sizeof(request), NULL, 0);
 498 }
 499
 500 void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
 501                                u8 intf2_id, u16 cport2_id)
 502 {
 503         struct gb_svc_conn_destroy_request request;
 504         struct gb_connection *connection = svc->connection;
 505         int ret;
 506
 507         request.intf1_id = intf1_id;
 508         request.cport1_id = cpu_to_le16(cport1_id);
 509         request.intf2_id = intf2_id;
 510         request.cport2_id = cpu_to_le16(cport2_id);
 511
 512         ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
 513                                 &request, sizeof(request), NULL, 0);
 514         if (ret) {
 515                 dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n",
 516                                 intf1_id, cport1_id, intf2_id, cport2_id, ret);
 517         }
 518 }
 519
 520 /* Creates bi-directional routes between the devices */
 521 int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
 522                                u8 intf2_id, u8 dev2_id)
 523 {
 524         struct gb_svc_route_create_request request;
 525
 526         request.intf1_id = intf1_id;
 527         request.dev1_id = dev1_id;
 528         request.intf2_id = intf2_id;
 529         request.dev2_id = dev2_id;
 530
 531         return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
 532                                  &request, sizeof(request), NULL, 0);
 533 }
 534
 535 /* Destroys bi-directional routes between the devices */
 536 void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
 537 {
 538         struct gb_svc_route_destroy_request request;
 539         int ret;
 540
 541         request.intf1_id = intf1_id;
 542         request.intf2_id = intf2_id;
 543
 544         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
 545                                 &request, sizeof(request), NULL, 0);
 546         if (ret) {
 547                 dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
 548                                 intf1_id, intf2_id, ret);
 549         }
 550 }
 551
 552 int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
 553                                u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
 554                                u8 tx_amplitude, u8 tx_hs_equalizer,
 555                                u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
 556                                u8 flags, u32 quirks,
 557                                struct gb_svc_l2_timer_cfg *local,
 558                                struct gb_svc_l2_timer_cfg *remote)
 559 {
 560         struct gb_svc_intf_set_pwrm_request request;
 561         struct gb_svc_intf_set_pwrm_response response;
 562         int ret;
 563         u16 result_code;
 564
 565         memset(&request, 0, sizeof(request));
 566
 567         request.intf_id = intf_id;
 568         request.hs_series = hs_series;
 569         request.tx_mode = tx_mode;
 570         request.tx_gear = tx_gear;
 571         request.tx_nlanes = tx_nlanes;
 572         request.tx_amplitude = tx_amplitude;
 573         request.tx_hs_equalizer = tx_hs_equalizer;
 574         request.rx_mode = rx_mode;
 575         request.rx_gear = rx_gear;
 576         request.rx_nlanes = rx_nlanes;
 577         request.flags = flags;
 578         request.quirks = cpu_to_le32(quirks);
 579         if (local)
 580                 request.local_l2timerdata = *local;
 581         if (remote)
 582                 request.remote_l2timerdata = *remote;
 583
 584         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 585                                 &request, sizeof(request),
 586                                 &response, sizeof(response));
 587         if (ret < 0)
 588                 return ret;
 589
 590         result_code = response.result_code;
 591         if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) {
 592                 dev_err(&svc->dev, "set power mode = %d\n", result_code);
 593                 return -EIO;
 594         }
 595
 596         return 0;
 597 }
 598 EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
 599
 600 int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id)
 601 {
 602         struct gb_svc_intf_set_pwrm_request request;
 603         struct gb_svc_intf_set_pwrm_response response;
 604         int ret;
 605         u16 result_code;
 606
 607         memset(&request, 0, sizeof(request));
 608
 609         request.intf_id = intf_id;
 610         request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A;
 611         request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 612         request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 613
 614         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 615                                 &request, sizeof(request),
 616                                 &response, sizeof(response));
 617         if (ret < 0) {
 618                 dev_err(&svc->dev,
 619                         "failed to send set power mode operation to interface %u: %d\n",
 620                         intf_id, ret);
 621                 return ret;
 622         }
 623
 624         result_code = response.result_code;
 625         if (result_code != GB_SVC_SETPWRM_PWR_OK) {
 626                 dev_err(&svc->dev,
 627                         "failed to hibernate the link for interface %u: %u\n",
 628                         intf_id, result_code);
 629                 return -EIO;
 630         }
 631
 632         return 0;
 633 }
 634
 635 int gb_svc_ping(struct gb_svc *svc)
 636 {
 637         return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
 638                                          NULL, 0, NULL, 0,
 639                                          GB_OPERATION_TIMEOUT_DEFAULT * 2);
 640 }
 641
 642 static int gb_svc_version_request(struct gb_operation *op)
 643 {
 644         struct gb_connection *connection = op->connection;
 645         struct gb_svc *svc = gb_connection_get_data(connection);
 646         struct gb_svc_version_request *request;
 647         struct gb_svc_version_response *response;
 648
 649         if (op->request->payload_size < sizeof(*request)) {
 650                 dev_err(&svc->dev, "short version request (%zu < %zu)\n",
 651                                 op->request->payload_size,
 652                                 sizeof(*request));
 653                 return -EINVAL;
 654         }
 655
 656         request = op->request->payload;
 657
 658         if (request->major > GB_SVC_VERSION_MAJOR) {
 659                 dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
 660                                 request->major, GB_SVC_VERSION_MAJOR);
 661                 return -ENOTSUPP;
 662         }
 663
 664         svc->protocol_major = request->major;
 665         svc->protocol_minor = request->minor;
 666
 667         if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
 668                 return -ENOMEM;
 669
 670         response = op->response->payload;
 671         response->major = svc->protocol_major;
 672         response->minor = svc->protocol_minor;
 673
 674         return 0;
 675 }
 676
 677 static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf,
 678                                         size_t len, loff_t *offset)
 679 {
 680         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 681                 file_inode(file)->i_private;
 682         struct gb_svc *svc = pwrmon_rails->svc;
 683         int ret, desc;
 684         u32 value;
 685         char buff[16];
 686
 687         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 688                                        GB_SVC_PWRMON_TYPE_VOL, &value);
 689         if (ret) {
 690                 dev_err(&svc->dev,
 691                         "failed to get voltage sample %u: %d\n",
 692                         pwrmon_rails->id, ret);
 693                 return ret;
 694         }
 695
 696         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 697
 698         return simple_read_from_buffer(buf, len, offset, buff, desc);
 699 }
 700
 701 static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf,
 702                                         size_t len, loff_t *offset)
 703 {
 704         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 705                 file_inode(file)->i_private;
 706         struct gb_svc *svc = pwrmon_rails->svc;
 707         int ret, desc;
 708         u32 value;
 709         char buff[16];
 710
 711         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 712                                        GB_SVC_PWRMON_TYPE_CURR, &value);
 713         if (ret) {
 714                 dev_err(&svc->dev,
 715                         "failed to get current sample %u: %d\n",
 716                         pwrmon_rails->id, ret);
 717                 return ret;
 718         }
 719
 720         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 721
 722         return simple_read_from_buffer(buf, len, offset, buff, desc);
 723 }
 724
 725 static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf,
 726                                       size_t len, loff_t *offset)
 727 {
 728         struct svc_debugfs_pwrmon_rail *pwrmon_rails =
 729                 file_inode(file)->i_private;
 730         struct gb_svc *svc = pwrmon_rails->svc;
 731         int ret, desc;
 732         u32 value;
 733         char buff[16];
 734
 735         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 736                                        GB_SVC_PWRMON_TYPE_PWR, &value);
 737         if (ret) {
 738                 dev_err(&svc->dev, "failed to get power sample %u: %d\n",
 739                         pwrmon_rails->id, ret);
 740                 return ret;
 741         }
 742
 743         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 744
 745         return simple_read_from_buffer(buf, len, offset, buff, desc);
 746 }
 747
 748 static const struct file_operations pwrmon_debugfs_voltage_fops = {
 749         .read           = pwr_debugfs_voltage_read,
 750 };
 751
 752 static const struct file_operations pwrmon_debugfs_current_fops = {
 753         .read           = pwr_debugfs_current_read,
 754 };
 755
 756 static const struct file_operations pwrmon_debugfs_power_fops = {
 757         .read           = pwr_debugfs_power_read,
 758 };
 759
 760 static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc)
 761 {
 762         int i;
 763         size_t bufsize;
 764         struct dentry *dent;
 765         struct gb_svc_pwrmon_rail_names_get_response *rail_names;
 766         u8 rail_count;
 767
 768         dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry);
 769         if (IS_ERR_OR_NULL(dent))
 770                 return;
 771
 772         if (gb_svc_pwrmon_rail_count_get(svc, &rail_count))
 773                 goto err_pwrmon_debugfs;
 774
 775         if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT)
 776                 goto err_pwrmon_debugfs;
 777
 778         bufsize = sizeof(*rail_names) +
 779                 GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count;
 780
 781         rail_names = kzalloc(bufsize, GFP_KERNEL);
 782         if (!rail_names)
 783                 goto err_pwrmon_debugfs;
 784
 785         svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails),
 786                                     GFP_KERNEL);
 787         if (!svc->pwrmon_rails)
 788                 goto err_pwrmon_debugfs_free;
 789
 790         if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize))
 791                 goto err_pwrmon_debugfs_free;
 792
 793         for (i = 0; i < rail_count; i++) {
 794                 struct dentry *dir;
 795                 struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i];
 796                 char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE];
 797
 798                 snprintf(fname, sizeof(fname), "%s",
 799                          (char *)&rail_names->name[i]);
 800
 801                 rail->id = i;
 802                 rail->svc = svc;
 803
 804                 dir = debugfs_create_dir(fname, dent);
 805                 debugfs_create_file("voltage_now", 0444, dir, rail,
 806                                     &pwrmon_debugfs_voltage_fops);
 807                 debugfs_create_file("current_now", 0444, dir, rail,
 808                                     &pwrmon_debugfs_current_fops);
 809                 debugfs_create_file("power_now", 0444, dir, rail,
 810                                     &pwrmon_debugfs_power_fops);
 811         }
 812
 813         kfree(rail_names);
 814         return;
 815
 816 err_pwrmon_debugfs_free:
 817         kfree(rail_names);
 818         kfree(svc->pwrmon_rails);
 819         svc->pwrmon_rails = NULL;
 820
 821 err_pwrmon_debugfs:
 822         debugfs_remove(dent);
 823 }
 824
 825 static void gb_svc_debugfs_init(struct gb_svc *svc)
 826 {
 827         svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev),
 828                                                  gb_debugfs_get());
 829         gb_svc_pwrmon_debugfs_init(svc);
 830 }
 831
 832 static void gb_svc_debugfs_exit(struct gb_svc *svc)
 833 {
 834         debugfs_remove_recursive(svc->debugfs_dentry);
 835         kfree(svc->pwrmon_rails);
 836         svc->pwrmon_rails = NULL;
 837 }
 838
 839 static int gb_svc_hello(struct gb_operation *op)
 840 {
 841         struct gb_connection *connection = op->connection;
 842         struct gb_svc *svc = gb_connection_get_data(connection);
 843         struct gb_svc_hello_request *hello_request;
 844         int ret;
 845
 846         if (op->request->payload_size < sizeof(*hello_request)) {
 847                 dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
 848                                 op->request->payload_size,
 849                                 sizeof(*hello_request));
 850                 return -EINVAL;
 851         }
 852
 853         hello_request = op->request->payload;
 854         svc->endo_id = le16_to_cpu(hello_request->endo_id);
 855         svc->ap_intf_id = hello_request->interface_id;
 856
 857         ret = device_add(&svc->dev);
 858         if (ret) {
 859                 dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
 860                 return ret;
 861         }
 862
 863         ret = gb_svc_watchdog_create(svc);
 864         if (ret) {
 865                 dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
 866                 goto err_unregister_device;
 867         }
 868
 869         gb_svc_debugfs_init(svc);
 870
 871         return gb_svc_queue_deferred_request(op);
 872
 873 err_unregister_device:
 874         gb_svc_watchdog_destroy(svc);
 875         device_del(&svc->dev);
 876         return ret;
 877 }
 878
 879 static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
 880                                                         u8 intf_id)
 881 {
 882         struct gb_host_device *hd = svc->hd;
 883         struct gb_module *module;
 884         size_t num_interfaces;
 885         u8 module_id;
 886
 887         list_for_each_entry(module, &hd->modules, hd_node) {
 888                 module_id = module->module_id;
 889                 num_interfaces = module->num_interfaces;
 890
 891                 if (intf_id >= module_id &&
 892                                 intf_id < module_id + num_interfaces) {
 893                         return module->interfaces[intf_id - module_id];
 894                 }
 895         }
 896
 897         return NULL;
 898 }
 899
 900 static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
 901 {
 902         struct gb_host_device *hd = svc->hd;
 903         struct gb_module *module;
 904
 905         list_for_each_entry(module, &hd->modules, hd_node) {
 906                 if (module->module_id == module_id)
 907                         return module;
 908         }
 909
 910         return NULL;
 911 }
 912
 913 static void gb_svc_process_hello_deferred(struct gb_operation *operation)
 914 {
 915         struct gb_connection *connection = operation->connection;
 916         struct gb_svc *svc = gb_connection_get_data(connection);
 917         int ret;
 918
 919         /*
 920          * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch
 921          * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient
 922          * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged
 923          * module.
 924          *
 925          * The code should be removed once SW-2217, Heuristic for UniPro
 926          * Power Mode Changes is resolved.
 927          */
 928         ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
 929                                          GB_SVC_UNIPRO_HS_SERIES_A,
 930                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 931                                          2, 1,
 932                                          GB_SVC_SMALL_AMPLITUDE,
 933                                          GB_SVC_NO_DE_EMPHASIS,
 934                                          GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 935                                          2, 1,
 936                                          0, 0,
 937                                          NULL, NULL);
 938
 939         if (ret)
 940                 dev_warn(&svc->dev,
 941                         "power mode change failed on AP to switch link: %d\n",
 942                         ret);
 943 }
 944
 945 static void gb_svc_process_module_inserted(struct gb_operation *operation)
 946 {
 947         struct gb_svc_module_inserted_request *request;
 948         struct gb_connection *connection = operation->connection;
 949         struct gb_svc *svc = gb_connection_get_data(connection);
 950         struct gb_host_device *hd = svc->hd;
 951         struct gb_module *module;
 952         size_t num_interfaces;
 953         u8 module_id;
 954         u16 flags;
 955         int ret;
 956
 957         /* The request message size has already been verified. */
 958         request = operation->request->payload;
 959         module_id = request->primary_intf_id;
 960         num_interfaces = request->intf_count;
 961         flags = le16_to_cpu(request->flags);
 962
 963         dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n",
 964                         __func__, module_id, num_interfaces, flags);
 965
 966         if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) {
 967                 dev_warn(&svc->dev, "no primary interface detected on module %u\n",
 968                                 module_id);
 969         }
 970
 971         module = gb_svc_module_lookup(svc, module_id);
 972         if (module) {
 973                 dev_warn(&svc->dev, "unexpected module-inserted event %u\n",
 974                                 module_id);
 975                 return;
 976         }
 977
 978         module = gb_module_create(hd, module_id, num_interfaces);
 979         if (!module) {
 980                 dev_err(&svc->dev, "failed to create module\n");
 981                 return;
 982         }
 983
 984         ret = gb_module_add(module);
 985         if (ret) {
 986                 gb_module_put(module);
 987                 return;
 988         }
 989
 990         list_add(&module->hd_node, &hd->modules);
 991 }
 992
 993 static void gb_svc_process_module_removed(struct gb_operation *operation)
 994 {
 995         struct gb_svc_module_removed_request *request;
 996         struct gb_connection *connection = operation->connection;
 997         struct gb_svc *svc = gb_connection_get_data(connection);
 998         struct gb_module *module;
 999         u8 module_id;
1000
1001         /* The request message size has already been verified. */
1002         request = operation->request->payload;
1003         module_id = request->primary_intf_id;
1004
1005         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id);
1006
1007         module = gb_svc_module_lookup(svc, module_id);
1008         if (!module) {
1009                 dev_warn(&svc->dev, "unexpected module-removed event %u\n",
1010                                 module_id);
1011                 return;
1012         }
1013
1014         module->disconnected = true;
1015
1016         gb_module_del(module);
1017         list_del(&module->hd_node);
1018         gb_module_put(module);
1019 }
1020
1021 static void gb_svc_process_intf_oops(struct gb_operation *operation)
1022 {
1023         struct gb_svc_intf_oops_request *request;
1024         struct gb_connection *connection = operation->connection;
1025         struct gb_svc *svc = gb_connection_get_data(connection);
1026         struct gb_interface *intf;
1027         u8 intf_id;
1028         u8 reason;
1029
1030         /* The request message size has already been verified. */
1031         request = operation->request->payload;
1032         intf_id = request->intf_id;
1033         reason = request->reason;
1034
1035         intf = gb_svc_interface_lookup(svc, intf_id);
1036         if (!intf) {
1037                 dev_warn(&svc->dev, "unexpected interface-oops event %u\n",
1038                          intf_id);
1039                 return;
1040         }
1041
1042         dev_info(&svc->dev, "Deactivating interface %u, interface oops reason = %u\n",
1043                  intf_id, reason);
1044
1045         mutex_lock(&intf->mutex);
1046         intf->disconnected = true;
1047         gb_interface_disable(intf);
1048         gb_interface_deactivate(intf);
1049         mutex_unlock(&intf->mutex);
1050 }
1051
1052 static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
1053 {
1054         struct gb_svc_intf_mailbox_event_request *request;
1055         struct gb_connection *connection = operation->connection;
1056         struct gb_svc *svc = gb_connection_get_data(connection);
1057         struct gb_interface *intf;
1058         u8 intf_id;
1059         u16 result_code;
1060         u32 mailbox;
1061
1062         /* The request message size has already been verified. */
1063         request = operation->request->payload;
1064         intf_id = request->intf_id;
1065         result_code = le16_to_cpu(request->result_code);
1066         mailbox = le32_to_cpu(request->mailbox);
1067
1068         dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
1069                         __func__, intf_id, result_code, mailbox);
1070
1071         intf = gb_svc_interface_lookup(svc, intf_id);
1072         if (!intf) {
1073                 dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
1074                 return;
1075         }
1076
1077         gb_interface_mailbox_event(intf, result_code, mailbox);
1078 }
1079
1080 static void gb_svc_process_deferred_request(struct work_struct *work)
1081 {
1082         struct gb_svc_deferred_request *dr;
1083         struct gb_operation *operation;
1084         struct gb_svc *svc;
1085         u8 type;
1086
1087         dr = container_of(work, struct gb_svc_deferred_request, work);
1088         operation = dr->operation;
1089         svc = gb_connection_get_data(operation->connection);
1090         type = operation->request->header->type;
1091
1092         switch (type) {
1093         case GB_SVC_TYPE_SVC_HELLO:
1094                 gb_svc_process_hello_deferred(operation);
1095                 break;
1096         case GB_SVC_TYPE_MODULE_INSERTED:
1097                 gb_svc_process_module_inserted(operation);
1098                 break;
1099         case GB_SVC_TYPE_MODULE_REMOVED:
1100                 gb_svc_process_module_removed(operation);
1101                 break;
1102         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1103                 gb_svc_process_intf_mailbox_event(operation);
1104                 break;
1105         case GB_SVC_TYPE_INTF_OOPS:
1106                 gb_svc_process_intf_oops(operation);
1107                 break;
1108         default:
1109                 dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
1110         }
1111
1112         gb_operation_put(operation);
1113         kfree(dr);
1114 }
1115
1116 static int gb_svc_queue_deferred_request(struct gb_operation *operation)
1117 {
1118         struct gb_svc *svc = gb_connection_get_data(operation->connection);
1119         struct gb_svc_deferred_request *dr;
1120
1121         dr = kmalloc(sizeof(*dr), GFP_KERNEL);
1122         if (!dr)
1123                 return -ENOMEM;
1124
1125         gb_operation_get(operation);
1126
1127         dr->operation = operation;
1128         INIT_WORK(&dr->work, gb_svc_process_deferred_request);
1129
1130         queue_work(svc->wq, &dr->work);
1131
1132         return 0;
1133 }
1134
1135 static int gb_svc_intf_reset_recv(struct gb_operation *op)
1136 {
1137         struct gb_svc *svc = gb_connection_get_data(op->connection);
1138         struct gb_message *request = op->request;
1139         struct gb_svc_intf_reset_request *reset;
1140
1141         if (request->payload_size < sizeof(*reset)) {
1142                 dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
1143                                 request->payload_size, sizeof(*reset));
1144                 return -EINVAL;
1145         }
1146         reset = request->payload;
1147
1148         /* FIXME Reset the interface here */
1149
1150         return 0;
1151 }
1152
1153 static int gb_svc_module_inserted_recv(struct gb_operation *op)
1154 {
1155         struct gb_svc *svc = gb_connection_get_data(op->connection);
1156         struct gb_svc_module_inserted_request *request;
1157
1158         if (op->request->payload_size < sizeof(*request)) {
1159                 dev_warn(&svc->dev, "short module-inserted request received (%zu < %zu)\n",
1160                                 op->request->payload_size, sizeof(*request));
1161                 return -EINVAL;
1162         }
1163
1164         request = op->request->payload;
1165
1166         dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1167                         request->primary_intf_id);
1168
1169         return gb_svc_queue_deferred_request(op);
1170 }
1171
1172 static int gb_svc_module_removed_recv(struct gb_operation *op)
1173 {
1174         struct gb_svc *svc = gb_connection_get_data(op->connection);
1175         struct gb_svc_module_removed_request *request;
1176
1177         if (op->request->payload_size < sizeof(*request)) {
1178                 dev_warn(&svc->dev, "short module-removed request received (%zu < %zu)\n",
1179                                 op->request->payload_size, sizeof(*request));
1180                 return -EINVAL;
1181         }
1182
1183         request = op->request->payload;
1184
1185         dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1186                         request->primary_intf_id);
1187
1188         return gb_svc_queue_deferred_request(op);
1189 }
1190
1191 static int gb_svc_intf_oops_recv(struct gb_operation *op)
1192 {
1193         struct gb_svc *svc = gb_connection_get_data(op->connection);
1194         struct gb_svc_intf_oops_request *request;
1195
1196         if (op->request->payload_size < sizeof(*request)) {
1197                 dev_warn(&svc->dev, "short intf-oops request received (%zu < %zu)\n",
1198                          op->request->payload_size, sizeof(*request));
1199                 return -EINVAL;
1200         }
1201
1202         return gb_svc_queue_deferred_request(op);
1203 }
1204
1205 static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op)
1206 {
1207         struct gb_svc *svc = gb_connection_get_data(op->connection);
1208         struct gb_svc_intf_mailbox_event_request *request;
1209
1210         if (op->request->payload_size < sizeof(*request)) {
1211                 dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n",
1212                                 op->request->payload_size, sizeof(*request));
1213                 return -EINVAL;
1214         }
1215
1216         request = op->request->payload;
1217
1218         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
1219
1220         return gb_svc_queue_deferred_request(op);
1221 }
1222
1223 static int gb_svc_request_handler(struct gb_operation *op)
1224 {
1225         struct gb_connection *connection = op->connection;
1226         struct gb_svc *svc = gb_connection_get_data(connection);
1227         u8 type = op->type;
1228         int ret = 0;
1229
1230         /*
1231          * SVC requests need to follow a specific order (at least initially) and
1232          * below code takes care of enforcing that. The expected order is:
1233          * - PROTOCOL_VERSION
1234          * - SVC_HELLO
1235          * - Any other request, but the earlier two.
1236          *
1237          * Incoming requests are guaranteed to be serialized and so we don't
1238          * need to protect 'state' for any races.
1239          */
1240         switch (type) {
1241         case GB_SVC_TYPE_PROTOCOL_VERSION:
1242                 if (svc->state != GB_SVC_STATE_RESET)
1243                         ret = -EINVAL;
1244                 break;
1245         case GB_SVC_TYPE_SVC_HELLO:
1246                 if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
1247                         ret = -EINVAL;
1248                 break;
1249         default:
1250                 if (svc->state != GB_SVC_STATE_SVC_HELLO)
1251                         ret = -EINVAL;
1252                 break;
1253         }
1254
1255         if (ret) {
1256                 dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
1257                                 type, svc->state);
1258                 return ret;
1259         }
1260
1261         switch (type) {
1262         case GB_SVC_TYPE_PROTOCOL_VERSION:
1263                 ret = gb_svc_version_request(op);
1264                 if (!ret)
1265                         svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
1266                 return ret;
1267         case GB_SVC_TYPE_SVC_HELLO:
1268                 ret = gb_svc_hello(op);
1269                 if (!ret)
1270                         svc->state = GB_SVC_STATE_SVC_HELLO;
1271                 return ret;
1272         case GB_SVC_TYPE_INTF_RESET:
1273                 return gb_svc_intf_reset_recv(op);
1274         case GB_SVC_TYPE_MODULE_INSERTED:
1275                 return gb_svc_module_inserted_recv(op);
1276         case GB_SVC_TYPE_MODULE_REMOVED:
1277                 return gb_svc_module_removed_recv(op);
1278         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1279                 return gb_svc_intf_mailbox_event_recv(op);
1280         case GB_SVC_TYPE_INTF_OOPS:
1281                 return gb_svc_intf_oops_recv(op);
1282         default:
1283                 dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
1284                 return -EINVAL;
1285         }
1286 }
1287
1288 static void gb_svc_release(struct device *dev)
1289 {
1290         struct gb_svc *svc = to_gb_svc(dev);
1291
1292         if (svc->connection)
1293                 gb_connection_destroy(svc->connection);
1294         ida_destroy(&svc->device_id_map);
1295         destroy_workqueue(svc->wq);
1296         kfree(svc);
1297 }
1298
1299 struct device_type greybus_svc_type = {
1300         .name           = "greybus_svc",
1301         .release        = gb_svc_release,
1302 };
1303
1304 struct gb_svc *gb_svc_create(struct gb_host_device *hd)
1305 {
1306         struct gb_svc *svc;
1307
1308         svc = kzalloc(sizeof(*svc), GFP_KERNEL);
1309         if (!svc)
1310                 return NULL;
1311
1312         svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev));
1313         if (!svc->wq) {
1314                 kfree(svc);
1315                 return NULL;
1316         }
1317
1318         svc->dev.parent = &hd->dev;
1319         svc->dev.bus = &greybus_bus_type;
1320         svc->dev.type = &greybus_svc_type;
1321         svc->dev.groups = svc_groups;
1322         svc->dev.dma_mask = svc->dev.parent->dma_mask;
1323         device_initialize(&svc->dev);
1324
1325         dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
1326
1327         ida_init(&svc->device_id_map);
1328         svc->state = GB_SVC_STATE_RESET;
1329         svc->hd = hd;
1330
1331         svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
1332                                                 gb_svc_request_handler);
1333         if (IS_ERR(svc->connection)) {
1334                 dev_err(&svc->dev, "failed to create connection: %ld\n",
1335                                 PTR_ERR(svc->connection));
1336                 goto err_put_device;
1337         }
1338
1339         gb_connection_set_data(svc->connection, svc);
1340
1341         return svc;
1342
1343 err_put_device:
1344         put_device(&svc->dev);
1345         return NULL;
1346 }
1347
1348 int gb_svc_add(struct gb_svc *svc)
1349 {
1350         int ret;
1351
1352         /*
1353          * The SVC protocol is currently driven by the SVC, so the SVC device
1354          * is added from the connection request handler when enough
1355          * information has been received.
1356          */
1357         ret = gb_connection_enable(svc->connection);
1358         if (ret)
1359                 return ret;
1360
1361         return 0;
1362 }
1363
1364 static void gb_svc_remove_modules(struct gb_svc *svc)
1365 {
1366         struct gb_host_device *hd = svc->hd;
1367         struct gb_module *module, *tmp;
1368
1369         list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) {
1370                 gb_module_del(module);
1371                 list_del(&module->hd_node);
1372                 gb_module_put(module);
1373         }
1374 }
1375
1376 void gb_svc_del(struct gb_svc *svc)
1377 {
1378         gb_connection_disable_rx(svc->connection);
1379
1380         /*
1381          * The SVC device may have been registered from the request handler.
1382          */
1383         if (device_is_registered(&svc->dev)) {
1384                 gb_svc_debugfs_exit(svc);
1385                 gb_svc_watchdog_destroy(svc);
1386                 device_del(&svc->dev);
1387         }
1388
1389         flush_workqueue(svc->wq);
1390
1391         gb_svc_remove_modules(svc);
1392
1393         gb_connection_disable(svc->connection);
1394 }
1395
1396 void gb_svc_put(struct gb_svc *svc)
1397 {
1398         put_device(&svc->dev);
1399 }