drivers/staging/greybus/svc.c

   1 /*
   2  * SVC Greybus driver.
   3  *
   4  * Copyright 2015 Google Inc.
   5  * Copyright 2015 Linaro Ltd.
   6  *
   7  * Released under the GPLv2 only.
   8  */
   9
  10 #include <linux/debugfs.h>
  11 #include <linux/workqueue.h>
  12
  13 #include "greybus.h"
  14
  15 #define SVC_INTF_EJECT_TIMEOUT          9000
  16 #define SVC_INTF_ACTIVATE_TIMEOUT       6000
  17 #define SVC_INTF_RESUME_TIMEOUT 3000
  18
  19 struct gb_svc_deferred_request {
  20         struct work_struct work;
  21         struct gb_operation *operation;
  22 };
  23
  24
  25 static int gb_svc_queue_deferred_request(struct gb_operation *operation);
  26
  27 static ssize_t endo_id_show(struct device *dev,
  28                         struct device_attribute *attr, char *buf)
  29 {
  30         struct gb_svc *svc = to_gb_svc(dev);
  31
  32         return sprintf(buf, "0x%04x\n", svc->endo_id);
  33 }
  34 static DEVICE_ATTR_RO(endo_id);
  35
  36 static ssize_t ap_intf_id_show(struct device *dev,
  37                         struct device_attribute *attr, char *buf)
  38 {
  39         struct gb_svc *svc = to_gb_svc(dev);
  40
  41         return sprintf(buf, "%u\n", svc->ap_intf_id);
  42 }
  43 static DEVICE_ATTR_RO(ap_intf_id);
  44
  45 // FIXME
  46 // This is a hack, we need to do this "right" and clean the interface up
  47 // properly, not just forcibly yank the thing out of the system and hope for the
  48 // best.  But for now, people want their modules to come out without having to
  49 // throw the thing to the ground or get out a screwdriver.
  50 static ssize_t intf_eject_store(struct device *dev,
  51                                 struct device_attribute *attr, const char *buf,
  52                                 size_t len)
  53 {
  54         struct gb_svc *svc = to_gb_svc(dev);
  55         unsigned short intf_id;
  56         int ret;
  57
  58         ret = kstrtou16(buf, 10, &intf_id);
  59         if (ret < 0)
  60                 return ret;
  61
  62         dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
  63
  64         ret = gb_svc_intf_eject(svc, intf_id);
  65         if (ret < 0)
  66                 return ret;
  67
  68         return len;
  69 }
  70 static DEVICE_ATTR_WO(intf_eject);
  71
  72 static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr,
  73                              char *buf)
  74 {
  75         struct gb_svc *svc = to_gb_svc(dev);
  76
  77         return sprintf(buf, "%s\n",
  78                        gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled");
  79 }
  80
  81 static ssize_t watchdog_store(struct device *dev,
  82                               struct device_attribute *attr, const char *buf,
  83                               size_t len)
  84 {
  85         struct gb_svc *svc = to_gb_svc(dev);
  86         int retval;
  87         bool user_request;
  88
  89         retval = strtobool(buf, &user_request);
  90         if (retval)
  91                 return retval;
  92
  93         if (user_request)
  94                 retval = gb_svc_watchdog_enable(svc);
  95         else
  96                 retval = gb_svc_watchdog_disable(svc);
  97         if (retval)
  98                 return retval;
  99         return len;
 100 }
 101 static DEVICE_ATTR_RW(watchdog);
 102
 103 static ssize_t watchdog_action_show(struct device *dev,
 104                                     struct device_attribute *attr, char *buf)
 105 {
 106         struct gb_svc *svc = to_gb_svc(dev);
 107
 108         if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL)
 109                 return sprintf(buf, "panic\n");
 110         else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO)
 111                 return sprintf(buf, "reset\n");
 112
 113         return -EINVAL;
 114 }
 115
 116 static ssize_t watchdog_action_store(struct device *dev,
 117                                      struct device_attribute *attr,
 118                                      const char *buf, size_t len)
 119 {
 120         struct gb_svc *svc = to_gb_svc(dev);
 121
 122         if (sysfs_streq(buf, "panic"))
 123                 svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL;
 124         else if (sysfs_streq(buf, "reset"))
 125                 svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO;
 126         else
 127                 return -EINVAL;
 128
 129         return len;
 130 }
 131 static DEVICE_ATTR_RW(watchdog_action);
 132
 133 static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value)
 134 {
 135         struct gb_svc_pwrmon_rail_count_get_response response;
 136         int ret;
 137
 138         ret = gb_operation_sync(svc->connection,
 139                                 GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0,
 140                                 &response, sizeof(response));
 141         if (ret) {
 142                 dev_err(&svc->dev, "failed to get rail count: %d\n", ret);
 143                 return ret;
 144         }
 145
 146         *value = response.rail_count;
 147
 148         return 0;
 149 }
 150
 151 static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc,
 152                 struct gb_svc_pwrmon_rail_names_get_response *response,
 153                 size_t bufsize)
 154 {
 155         int ret;
 156
 157         ret = gb_operation_sync(svc->connection,
 158                                 GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0,
 159                                 response, bufsize);
 160         if (ret) {
 161                 dev_err(&svc->dev, "failed to get rail names: %d\n", ret);
 162                 return ret;
 163         }
 164
 165         if (response->status != GB_SVC_OP_SUCCESS) {
 166                 dev_err(&svc->dev,
 167                         "SVC error while getting rail names: %u\n",
 168                         response->status);
 169                 return -EREMOTEIO;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id,
 176                                     u8 measurement_type, u32 *value)
 177 {
 178         struct gb_svc_pwrmon_sample_get_request request;
 179         struct gb_svc_pwrmon_sample_get_response response;
 180         int ret;
 181
 182         request.rail_id = rail_id;
 183         request.measurement_type = measurement_type;
 184
 185         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET,
 186                                 &request, sizeof(request),
 187                                 &response, sizeof(response));
 188         if (ret) {
 189                 dev_err(&svc->dev, "failed to get rail sample: %d\n", ret);
 190                 return ret;
 191         }
 192
 193         if (response.result) {
 194                 dev_err(&svc->dev,
 195                         "UniPro error while getting rail power sample (%d %d): %d\n",
 196                         rail_id, measurement_type, response.result);
 197                 switch (response.result) {
 198                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 199                         return -EINVAL;
 200                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 201                         return -ENOMSG;
 202                 default:
 203                         return -EREMOTEIO;
 204                 }
 205         }
 206
 207         *value = le32_to_cpu(response.measurement);
 208
 209         return 0;
 210 }
 211
 212 int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
 213                                   u8 measurement_type, u32 *value)
 214 {
 215         struct gb_svc_pwrmon_intf_sample_get_request request;
 216         struct gb_svc_pwrmon_intf_sample_get_response response;
 217         int ret;
 218
 219         request.intf_id = intf_id;
 220         request.measurement_type = measurement_type;
 221
 222         ret = gb_operation_sync(svc->connection,
 223                                 GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET,
 224                                 &request, sizeof(request),
 225                                 &response, sizeof(response));
 226         if (ret) {
 227                 dev_err(&svc->dev, "failed to get intf sample: %d\n", ret);
 228                 return ret;
 229         }
 230
 231         if (response.result) {
 232                 dev_err(&svc->dev,
 233                         "UniPro error while getting intf power sample (%d %d): %d\n",
 234                         intf_id, measurement_type, response.result);
 235                 switch (response.result) {
 236                 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
 237                         return -EINVAL;
 238                 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
 239                         return -ENOMSG;
 240                 default:
 241                         return -EREMOTEIO;
 242                 }
 243         }
 244
 245         *value = le32_to_cpu(response.measurement);
 246
 247         return 0;
 248 }
 249
 250 static struct attribute *svc_attrs[] = {
 251         &dev_attr_endo_id.attr,
 252         &dev_attr_ap_intf_id.attr,
 253         &dev_attr_intf_eject.attr,
 254         &dev_attr_watchdog.attr,
 255         &dev_attr_watchdog_action.attr,
 256         NULL,
 257 };
 258 ATTRIBUTE_GROUPS(svc);
 259
 260 int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
 261 {
 262         struct gb_svc_intf_device_id_request request;
 263
 264         request.intf_id = intf_id;
 265         request.device_id = device_id;
 266
 267         return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
 268                                  &request, sizeof(request), NULL, 0);
 269 }
 270
 271 int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
 272 {
 273         struct gb_svc_intf_eject_request request;
 274         int ret;
 275
 276         request.intf_id = intf_id;
 277
 278         /*
 279          * The pulse width for module release in svc is long so we need to
 280          * increase the timeout so the operation will not return to soon.
 281          */
 282         ret = gb_operation_sync_timeout(svc->connection,
 283                                         GB_SVC_TYPE_INTF_EJECT, &request,
 284                                         sizeof(request), NULL, 0,
 285                                         SVC_INTF_EJECT_TIMEOUT);
 286         if (ret) {
 287                 dev_err(&svc->dev, "failed to eject interface %u\n", intf_id);
 288                 return ret;
 289         }
 290
 291         return 0;
 292 }
 293
 294 int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable)
 295 {
 296         struct gb_svc_intf_vsys_request request;
 297         struct gb_svc_intf_vsys_response response;
 298         int type, ret;
 299
 300         request.intf_id = intf_id;
 301
 302         if (enable)
 303                 type = GB_SVC_TYPE_INTF_VSYS_ENABLE;
 304         else
 305                 type = GB_SVC_TYPE_INTF_VSYS_DISABLE;
 306
 307         ret = gb_operation_sync(svc->connection, type,
 308                         &request, sizeof(request),
 309                         &response, sizeof(response));
 310         if (ret < 0)
 311                 return ret;
 312         if (response.result_code != GB_SVC_INTF_VSYS_OK)
 313                 return -EREMOTEIO;
 314         return 0;
 315 }
 316
 317 int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable)
 318 {
 319         struct gb_svc_intf_refclk_request request;
 320         struct gb_svc_intf_refclk_response response;
 321         int type, ret;
 322
 323         request.intf_id = intf_id;
 324
 325         if (enable)
 326                 type = GB_SVC_TYPE_INTF_REFCLK_ENABLE;
 327         else
 328                 type = GB_SVC_TYPE_INTF_REFCLK_DISABLE;
 329
 330         ret = gb_operation_sync(svc->connection, type,
 331                         &request, sizeof(request),
 332                         &response, sizeof(response));
 333         if (ret < 0)
 334                 return ret;
 335         if (response.result_code != GB_SVC_INTF_REFCLK_OK)
 336                 return -EREMOTEIO;
 337         return 0;
 338 }
 339
 340 int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
 341 {
 342         struct gb_svc_intf_unipro_request request;
 343         struct gb_svc_intf_unipro_response response;
 344         int type, ret;
 345
 346         request.intf_id = intf_id;
 347
 348         if (enable)
 349                 type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE;
 350         else
 351                 type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE;
 352
 353         ret = gb_operation_sync(svc->connection, type,
 354                         &request, sizeof(request),
 355                         &response, sizeof(response));
 356         if (ret < 0)
 357                 return ret;
 358         if (response.result_code != GB_SVC_INTF_UNIPRO_OK)
 359                 return -EREMOTEIO;
 360         return 0;
 361 }
 362
 363 int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
 364 {
 365         struct gb_svc_intf_activate_request request;
 366         struct gb_svc_intf_activate_response response;
 367         int ret;
 368
 369         request.intf_id = intf_id;
 370
 371         ret = gb_operation_sync_timeout(svc->connection,
 372                         GB_SVC_TYPE_INTF_ACTIVATE,
 373                         &request, sizeof(request),
 374                         &response, sizeof(response),
 375                         SVC_INTF_ACTIVATE_TIMEOUT);
 376         if (ret < 0)
 377                 return ret;
 378         if (response.status != GB_SVC_OP_SUCCESS) {
 379                 dev_err(&svc->dev, "failed to activate interface %u: %u\n",
 380                                 intf_id, response.status);
 381                 return -EREMOTEIO;
 382         }
 383
 384         *intf_type = response.intf_type;
 385
 386         return 0;
 387 }
 388
 389 int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id)
 390 {
 391         struct gb_svc_intf_resume_request request;
 392         struct gb_svc_intf_resume_response response;
 393         int ret;
 394
 395         request.intf_id = intf_id;
 396
 397         ret = gb_operation_sync_timeout(svc->connection,
 398                                         GB_SVC_TYPE_INTF_RESUME,
 399                                         &request, sizeof(request),
 400                                         &response, sizeof(response),
 401                                         SVC_INTF_RESUME_TIMEOUT);
 402         if (ret < 0) {
 403                 dev_err(&svc->dev, "failed to send interface resume %u: %d\n",
 404                         intf_id, ret);
 405                 return ret;
 406         }
 407
 408         if (response.status != GB_SVC_OP_SUCCESS) {
 409                 dev_err(&svc->dev, "failed to resume interface %u: %u\n",
 410                         intf_id, response.status);
 411                 return -EREMOTEIO;
 412         }
 413
 414         return 0;
 415 }
 416
 417 int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 418                         u32 *value)
 419 {
 420         struct gb_svc_dme_peer_get_request request;
 421         struct gb_svc_dme_peer_get_response response;
 422         u16 result;
 423         int ret;
 424
 425         request.intf_id = intf_id;
 426         request.attr = cpu_to_le16(attr);
 427         request.selector = cpu_to_le16(selector);
 428
 429         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
 430                                 &request, sizeof(request),
 431                                 &response, sizeof(response));
 432         if (ret) {
 433                 dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n",
 434                                 intf_id, attr, selector, ret);
 435                 return ret;
 436         }
 437
 438         result = le16_to_cpu(response.result_code);
 439         if (result) {
 440                 dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n",
 441                                 intf_id, attr, selector, result);
 442                 return -EREMOTEIO;
 443         }
 444
 445         if (value)
 446                 *value = le32_to_cpu(response.attr_value);
 447
 448         return 0;
 449 }
 450 EXPORT_SYMBOL_GPL(gb_svc_dme_peer_get);
 451
 452 int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 453                         u32 value)
 454 {
 455         struct gb_svc_dme_peer_set_request request;
 456         struct gb_svc_dme_peer_set_response response;
 457         u16 result;
 458         int ret;
 459
 460         request.intf_id = intf_id;
 461         request.attr = cpu_to_le16(attr);
 462         request.selector = cpu_to_le16(selector);
 463         request.value = cpu_to_le32(value);
 464
 465         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
 466                                 &request, sizeof(request),
 467                                 &response, sizeof(response));
 468         if (ret) {
 469                 dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n",
 470                                 intf_id, attr, selector, value, ret);
 471                 return ret;
 472         }
 473
 474         result = le16_to_cpu(response.result_code);
 475         if (result) {
 476                 dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n",
 477                                 intf_id, attr, selector, value, result);
 478                 return -EREMOTEIO;
 479         }
 480
 481         return 0;
 482 }
 483 EXPORT_SYMBOL_GPL(gb_svc_dme_peer_set);
 484
 485 int gb_svc_connection_create(struct gb_svc *svc,
 486                                 u8 intf1_id, u16 cport1_id,
 487                                 u8 intf2_id, u16 cport2_id,
 488                                 u8 cport_flags)
 489 {
 490         struct gb_svc_conn_create_request request;
 491
 492         request.intf1_id = intf1_id;
 493         request.cport1_id = cpu_to_le16(cport1_id);
 494         request.intf2_id = intf2_id;
 495         request.cport2_id = cpu_to_le16(cport2_id);
 496         request.tc = 0;         /* TC0 */
 497         request.flags = cport_flags;
 498
 499         return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
 500                                  &request, sizeof(request), NULL, 0);
 501 }
 502 EXPORT_SYMBOL_GPL(gb_svc_connection_create);
 503
 504 void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
 505                                u8 intf2_id, u16 cport2_id)
 506 {
 507         struct gb_svc_conn_destroy_request request;
 508         struct gb_connection *connection = svc->connection;
 509         int ret;
 510
 511         request.intf1_id = intf1_id;
 512         request.cport1_id = cpu_to_le16(cport1_id);
 513         request.intf2_id = intf2_id;
 514         request.cport2_id = cpu_to_le16(cport2_id);
 515
 516         ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
 517                                 &request, sizeof(request), NULL, 0);
 518         if (ret) {
 519                 dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n",
 520                                 intf1_id, cport1_id, intf2_id, cport2_id, ret);
 521         }
 522 }
 523 EXPORT_SYMBOL_GPL(gb_svc_connection_destroy);
 524
 525 int gb_svc_timesync_enable(struct gb_svc *svc, u8 count, u64 frame_time,
 526                            u32 strobe_delay, u32 refclk)
 527 {
 528         struct gb_connection *connection = svc->connection;
 529         struct gb_svc_timesync_enable_request request;
 530
 531         request.count = count;
 532         request.frame_time = cpu_to_le64(frame_time);
 533         request.strobe_delay = cpu_to_le32(strobe_delay);
 534         request.refclk = cpu_to_le32(refclk);
 535         return gb_operation_sync(connection,
 536                                  GB_SVC_TYPE_TIMESYNC_ENABLE,
 537                                  &request, sizeof(request), NULL, 0);
 538 }
 539 EXPORT_SYMBOL_GPL(gb_svc_timesync_enable);
 540
 541 int gb_svc_timesync_disable(struct gb_svc *svc)
 542 {
 543         struct gb_connection *connection = svc->connection;
 544
 545         return gb_operation_sync(connection,
 546                                  GB_SVC_TYPE_TIMESYNC_DISABLE,
 547                                  NULL, 0, NULL, 0);
 548 }
 549 EXPORT_SYMBOL_GPL(gb_svc_timesync_disable);
 550
 551 int gb_svc_timesync_authoritative(struct gb_svc *svc, u64 *frame_time)
 552 {
 553         struct gb_connection *connection = svc->connection;
 554         struct gb_svc_timesync_authoritative_response response;
 555         int ret, i;
 556
 557         ret = gb_operation_sync(connection,
 558                                 GB_SVC_TYPE_TIMESYNC_AUTHORITATIVE, NULL, 0,
 559                                 &response, sizeof(response));
 560         if (ret < 0)
 561                 return ret;
 562
 563         for (i = 0; i < GB_TIMESYNC_MAX_STROBES; i++)
 564                 frame_time[i] = le64_to_cpu(response.frame_time[i]);
 565         return 0;
 566 }
 567 EXPORT_SYMBOL_GPL(gb_svc_timesync_authoritative);
 568
 569 int gb_svc_timesync_ping(struct gb_svc *svc, u64 *frame_time)
 570 {
 571         struct gb_connection *connection = svc->connection;
 572         struct gb_svc_timesync_ping_response response;
 573         int ret;
 574
 575         ret = gb_operation_sync(connection,
 576                                 GB_SVC_TYPE_TIMESYNC_PING,
 577                                 NULL, 0,
 578                                 &response, sizeof(response));
 579         if (ret < 0)
 580                 return ret;
 581
 582         *frame_time = le64_to_cpu(response.frame_time);
 583         return 0;
 584 }
 585 EXPORT_SYMBOL_GPL(gb_svc_timesync_ping);
 586
 587 int gb_svc_timesync_wake_pins_acquire(struct gb_svc *svc, u32 strobe_mask)
 588 {
 589         struct gb_connection *connection = svc->connection;
 590         struct gb_svc_timesync_wake_pins_acquire_request request;
 591
 592         request.strobe_mask = cpu_to_le32(strobe_mask);
 593         return gb_operation_sync(connection,
 594                                  GB_SVC_TYPE_TIMESYNC_WAKE_PINS_ACQUIRE,
 595                                  &request, sizeof(request),
 596                                  NULL, 0);
 597 }
 598 EXPORT_SYMBOL_GPL(gb_svc_timesync_wake_pins_acquire);
 599
 600 int gb_svc_timesync_wake_pins_release(struct gb_svc *svc)
 601 {
 602         struct gb_connection *connection = svc->connection;
 603
 604         return gb_operation_sync(connection,
 605                                  GB_SVC_TYPE_TIMESYNC_WAKE_PINS_RELEASE,
 606                                  NULL, 0, NULL, 0);
 607 }
 608 EXPORT_SYMBOL_GPL(gb_svc_timesync_wake_pins_release);
 609
 610 /* Creates bi-directional routes between the devices */
 611 int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
 612                                u8 intf2_id, u8 dev2_id)
 613 {
 614         struct gb_svc_route_create_request request;
 615
 616         request.intf1_id = intf1_id;
 617         request.dev1_id = dev1_id;
 618         request.intf2_id = intf2_id;
 619         request.dev2_id = dev2_id;
 620
 621         return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
 622                                  &request, sizeof(request), NULL, 0);
 623 }
 624
 625 /* Destroys bi-directional routes between the devices */
 626 void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
 627 {
 628         struct gb_svc_route_destroy_request request;
 629         int ret;
 630
 631         request.intf1_id = intf1_id;
 632         request.intf2_id = intf2_id;
 633
 634         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
 635                                 &request, sizeof(request), NULL, 0);
 636         if (ret) {
 637                 dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
 638                                 intf1_id, intf2_id, ret);
 639         }
 640 }
 641
 642 int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
 643                                u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
 644                                u8 tx_amplitude, u8 tx_hs_equalizer,
 645                                u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
 646                                u8 flags, u32 quirks,
 647                                struct gb_svc_l2_timer_cfg *local,
 648                                struct gb_svc_l2_timer_cfg *remote)
 649 {
 650         struct gb_svc_intf_set_pwrm_request request;
 651         struct gb_svc_intf_set_pwrm_response response;
 652         int ret;
 653         u16 result_code;
 654
 655         memset(&request, 0, sizeof(request));
 656
 657         request.intf_id = intf_id;
 658         request.hs_series = hs_series;
 659         request.tx_mode = tx_mode;
 660         request.tx_gear = tx_gear;
 661         request.tx_nlanes = tx_nlanes;
 662         request.tx_amplitude = tx_amplitude;
 663         request.tx_hs_equalizer = tx_hs_equalizer;
 664         request.rx_mode = rx_mode;
 665         request.rx_gear = rx_gear;
 666         request.rx_nlanes = rx_nlanes;
 667         request.flags = flags;
 668         request.quirks = cpu_to_le32(quirks);
 669         if (local)
 670                 request.local_l2timerdata = *local;
 671         if (remote)
 672                 request.remote_l2timerdata = *remote;
 673
 674         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 675                                 &request, sizeof(request),
 676                                 &response, sizeof(response));
 677         if (ret < 0)
 678                 return ret;
 679
 680         result_code = response.result_code;
 681         if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) {
 682                 dev_err(&svc->dev, "set power mode = %d\n", result_code);
 683                 return -EIO;
 684         }
 685
 686         return 0;
 687 }
 688 EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
 689
 690 int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id)
 691 {
 692         struct gb_svc_intf_set_pwrm_request request;
 693         struct gb_svc_intf_set_pwrm_response response;
 694         int ret;
 695         u16 result_code;
 696
 697         memset(&request, 0, sizeof(request));
 698
 699         request.intf_id = intf_id;
 700         request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A;
 701         request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 702         request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
 703
 704         ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
 705                                 &request, sizeof(request),
 706                                 &response, sizeof(response));
 707         if (ret < 0) {
 708                 dev_err(&svc->dev,
 709                         "failed to send set power mode operation to interface %u: %d\n",
 710                         intf_id, ret);
 711                 return ret;
 712         }
 713
 714         result_code = response.result_code;
 715         if (result_code != GB_SVC_SETPWRM_PWR_OK) {
 716                 dev_err(&svc->dev,
 717                         "failed to hibernate the link for interface %u: %u\n",
 718                         intf_id, result_code);
 719                 return -EIO;
 720         }
 721
 722         return 0;
 723 }
 724
 725 int gb_svc_ping(struct gb_svc *svc)
 726 {
 727         return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
 728                                          NULL, 0, NULL, 0,
 729                                          GB_OPERATION_TIMEOUT_DEFAULT * 2);
 730 }
 731 EXPORT_SYMBOL_GPL(gb_svc_ping);
 732
 733 static int gb_svc_version_request(struct gb_operation *op)
 734 {
 735         struct gb_connection *connection = op->connection;
 736         struct gb_svc *svc = gb_connection_get_data(connection);
 737         struct gb_svc_version_request *request;
 738         struct gb_svc_version_response *response;
 739
 740         if (op->request->payload_size < sizeof(*request)) {
 741                 dev_err(&svc->dev, "short version request (%zu < %zu)\n",
 742                                 op->request->payload_size,
 743                                 sizeof(*request));
 744                 return -EINVAL;
 745         }
 746
 747         request = op->request->payload;
 748
 749         if (request->major > GB_SVC_VERSION_MAJOR) {
 750                 dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
 751                                 request->major, GB_SVC_VERSION_MAJOR);
 752                 return -ENOTSUPP;
 753         }
 754
 755         svc->protocol_major = request->major;
 756         svc->protocol_minor = request->minor;
 757
 758         if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
 759                 return -ENOMEM;
 760
 761         response = op->response->payload;
 762         response->major = svc->protocol_major;
 763         response->minor = svc->protocol_minor;
 764
 765         return 0;
 766 }
 767
 768 static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf,
 769                                         size_t len, loff_t *offset)
 770 {
 771         struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private;
 772         struct gb_svc *svc = pwrmon_rails->svc;
 773         int ret, desc;
 774         u32 value;
 775         char buff[16];
 776
 777         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 778                                        GB_SVC_PWRMON_TYPE_VOL, &value);
 779         if (ret) {
 780                 dev_err(&svc->dev,
 781                         "failed to get voltage sample %u: %d\n",
 782                         pwrmon_rails->id, ret);
 783                 return ret;
 784         }
 785
 786         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 787
 788         return simple_read_from_buffer(buf, len, offset, buff, desc);
 789 }
 790
 791 static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf,
 792                                         size_t len, loff_t *offset)
 793 {
 794         struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private;
 795         struct gb_svc *svc = pwrmon_rails->svc;
 796         int ret, desc;
 797         u32 value;
 798         char buff[16];
 799
 800         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 801                                        GB_SVC_PWRMON_TYPE_CURR, &value);
 802         if (ret) {
 803                 dev_err(&svc->dev,
 804                         "failed to get current sample %u: %d\n",
 805                         pwrmon_rails->id, ret);
 806                 return ret;
 807         }
 808
 809         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 810
 811         return simple_read_from_buffer(buf, len, offset, buff, desc);
 812 }
 813
 814 static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf,
 815                                       size_t len, loff_t *offset)
 816 {
 817         struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private;
 818         struct gb_svc *svc = pwrmon_rails->svc;
 819         int ret, desc;
 820         u32 value;
 821         char buff[16];
 822
 823         ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
 824                                        GB_SVC_PWRMON_TYPE_PWR, &value);
 825         if (ret) {
 826                 dev_err(&svc->dev, "failed to get power sample %u: %d\n",
 827                         pwrmon_rails->id, ret);
 828                 return ret;
 829         }
 830
 831         desc = scnprintf(buff, sizeof(buff), "%u\n", value);
 832
 833         return simple_read_from_buffer(buf, len, offset, buff, desc);
 834 }
 835
 836 static const struct file_operations pwrmon_debugfs_voltage_fops = {
 837         .read           = pwr_debugfs_voltage_read,
 838 };
 839
 840 static const struct file_operations pwrmon_debugfs_current_fops = {
 841         .read           = pwr_debugfs_current_read,
 842 };
 843
 844 static const struct file_operations pwrmon_debugfs_power_fops = {
 845         .read           = pwr_debugfs_power_read,
 846 };
 847
 848 static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc)
 849 {
 850         int i;
 851         size_t bufsize;
 852         struct dentry *dent;
 853         struct gb_svc_pwrmon_rail_names_get_response *rail_names;
 854         u8 rail_count;
 855
 856         dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry);
 857         if (IS_ERR_OR_NULL(dent))
 858                 return;
 859
 860         if (gb_svc_pwrmon_rail_count_get(svc, &rail_count))
 861                 goto err_pwrmon_debugfs;
 862
 863         if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT)
 864                 goto err_pwrmon_debugfs;
 865
 866         bufsize = sizeof(*rail_names) +
 867                 GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count;
 868
 869         rail_names = kzalloc(bufsize, GFP_KERNEL);
 870         if (!rail_names)
 871                 goto err_pwrmon_debugfs;
 872
 873         svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails),
 874                                     GFP_KERNEL);
 875         if (!svc->pwrmon_rails)
 876                 goto err_pwrmon_debugfs_free;
 877
 878         if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize))
 879                 goto err_pwrmon_debugfs_free;
 880
 881         for (i = 0; i < rail_count; i++) {
 882                 struct dentry *dir;
 883                 struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i];
 884                 char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE];
 885
 886                 snprintf(fname, sizeof(fname), "%s",
 887                          (char *)&rail_names->name[i]);
 888
 889                 rail->id = i;
 890                 rail->svc = svc;
 891
 892                 dir = debugfs_create_dir(fname, dent);
 893                 debugfs_create_file("voltage_now", S_IRUGO, dir, rail,
 894                                     &pwrmon_debugfs_voltage_fops);
 895                 debugfs_create_file("current_now", S_IRUGO, dir, rail,
 896                                     &pwrmon_debugfs_current_fops);
 897                 debugfs_create_file("power_now", S_IRUGO, dir, rail,
 898                                     &pwrmon_debugfs_power_fops);
 899         }
 900
 901         kfree(rail_names);
 902         return;
 903
 904 err_pwrmon_debugfs_free:
 905         kfree(rail_names);
 906         kfree(svc->pwrmon_rails);
 907         svc->pwrmon_rails = NULL;
 908
 909 err_pwrmon_debugfs:
 910         debugfs_remove(dent);
 911 }
 912
 913 static void gb_svc_debugfs_init(struct gb_svc *svc)
 914 {
 915         svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev),
 916                                                  gb_debugfs_get());
 917         gb_svc_pwrmon_debugfs_init(svc);
 918 }
 919
 920 static void gb_svc_debugfs_exit(struct gb_svc *svc)
 921 {
 922         debugfs_remove_recursive(svc->debugfs_dentry);
 923         kfree(svc->pwrmon_rails);
 924         svc->pwrmon_rails = NULL;
 925 }
 926
 927 static int gb_svc_hello(struct gb_operation *op)
 928 {
 929         struct gb_connection *connection = op->connection;
 930         struct gb_svc *svc = gb_connection_get_data(connection);
 931         struct gb_svc_hello_request *hello_request;
 932         int ret;
 933
 934         if (op->request->payload_size < sizeof(*hello_request)) {
 935                 dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
 936                                 op->request->payload_size,
 937                                 sizeof(*hello_request));
 938                 return -EINVAL;
 939         }
 940
 941         hello_request = op->request->payload;
 942         svc->endo_id = le16_to_cpu(hello_request->endo_id);
 943         svc->ap_intf_id = hello_request->interface_id;
 944
 945         ret = device_add(&svc->dev);
 946         if (ret) {
 947                 dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
 948                 return ret;
 949         }
 950
 951         ret = gb_svc_watchdog_create(svc);
 952         if (ret) {
 953                 dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
 954                 goto err_unregister_device;
 955         }
 956
 957         gb_svc_debugfs_init(svc);
 958
 959         ret = gb_timesync_svc_add(svc);
 960         if (ret) {
 961                 dev_err(&svc->dev, "failed to add SVC to timesync: %d\n", ret);
 962                 gb_svc_debugfs_exit(svc);
 963                 goto err_unregister_device;
 964         }
 965
 966         return gb_svc_queue_deferred_request(op);
 967
 968 err_unregister_device:
 969         gb_svc_watchdog_destroy(svc);
 970         device_del(&svc->dev);
 971         return ret;
 972 }
 973
 974 static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
 975                                                         u8 intf_id)
 976 {
 977         struct gb_host_device *hd = svc->hd;
 978         struct gb_module *module;
 979         size_t num_interfaces;
 980         u8 module_id;
 981
 982         list_for_each_entry(module, &hd->modules, hd_node) {
 983                 module_id = module->module_id;
 984                 num_interfaces = module->num_interfaces;
 985
 986                 if (intf_id >= module_id &&
 987                                 intf_id < module_id + num_interfaces) {
 988                         return module->interfaces[intf_id - module_id];
 989                 }
 990         }
 991
 992         return NULL;
 993 }
 994
 995 static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
 996 {
 997         struct gb_host_device *hd = svc->hd;
 998         struct gb_module *module;
 999
1000         list_for_each_entry(module, &hd->modules, hd_node) {
1001                 if (module->module_id == module_id)
1002                         return module;
1003         }
1004
1005         return NULL;
1006 }
1007
1008 static void gb_svc_process_hello_deferred(struct gb_operation *operation)
1009 {
1010         struct gb_connection *connection = operation->connection;
1011         struct gb_svc *svc = gb_connection_get_data(connection);
1012         int ret;
1013
1014         /*
1015          * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch
1016          * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient
1017          * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged
1018          * module.
1019          *
1020          * The code should be removed once SW-2217, Heuristic for UniPro
1021          * Power Mode Changes is resolved.
1022          */
1023         ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
1024                                         GB_SVC_UNIPRO_HS_SERIES_A,
1025                                         GB_SVC_UNIPRO_SLOW_AUTO_MODE,
1026                                         2, 1,
1027                                         GB_SVC_SMALL_AMPLITUDE, GB_SVC_NO_DE_EMPHASIS,
1028                                         GB_SVC_UNIPRO_SLOW_AUTO_MODE,
1029                                         2, 1,
1030                                         0, 0,
1031                                         NULL, NULL);
1032
1033         if (ret)
1034                 dev_warn(&svc->dev,
1035                         "power mode change failed on AP to switch link: %d\n",
1036                         ret);
1037 }
1038
1039 static void gb_svc_process_module_inserted(struct gb_operation *operation)
1040 {
1041         struct gb_svc_module_inserted_request *request;
1042         struct gb_connection *connection = operation->connection;
1043         struct gb_svc *svc = gb_connection_get_data(connection);
1044         struct gb_host_device *hd = svc->hd;
1045         struct gb_module *module;
1046         size_t num_interfaces;
1047         u8 module_id;
1048         u16 flags;
1049         int ret;
1050
1051         /* The request message size has already been verified. */
1052         request = operation->request->payload;
1053         module_id = request->primary_intf_id;
1054         num_interfaces = request->intf_count;
1055         flags = le16_to_cpu(request->flags);
1056
1057         dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n",
1058                         __func__, module_id, num_interfaces, flags);
1059
1060         if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) {
1061                 dev_warn(&svc->dev, "no primary interface detected on module %u\n",
1062                                 module_id);
1063         }
1064
1065         module = gb_svc_module_lookup(svc, module_id);
1066         if (module) {
1067                 dev_warn(&svc->dev, "unexpected module-inserted event %u\n",
1068                                 module_id);
1069                 return;
1070         }
1071
1072         module = gb_module_create(hd, module_id, num_interfaces);
1073         if (!module) {
1074                 dev_err(&svc->dev, "failed to create module\n");
1075                 return;
1076         }
1077
1078         ret = gb_module_add(module);
1079         if (ret) {
1080                 gb_module_put(module);
1081                 return;
1082         }
1083
1084         list_add(&module->hd_node, &hd->modules);
1085 }
1086
1087 static void gb_svc_process_module_removed(struct gb_operation *operation)
1088 {
1089         struct gb_svc_module_removed_request *request;
1090         struct gb_connection *connection = operation->connection;
1091         struct gb_svc *svc = gb_connection_get_data(connection);
1092         struct gb_module *module;
1093         u8 module_id;
1094
1095         /* The request message size has already been verified. */
1096         request = operation->request->payload;
1097         module_id = request->primary_intf_id;
1098
1099         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id);
1100
1101         module = gb_svc_module_lookup(svc, module_id);
1102         if (!module) {
1103                 dev_warn(&svc->dev, "unexpected module-removed event %u\n",
1104                                 module_id);
1105                 return;
1106         }
1107
1108         module->disconnected = true;
1109
1110         gb_module_del(module);
1111         list_del(&module->hd_node);
1112         gb_module_put(module);
1113 }
1114
1115 static void gb_svc_process_intf_oops(struct gb_operation *operation)
1116 {
1117         struct gb_svc_intf_oops_request *request;
1118         struct gb_connection *connection = operation->connection;
1119         struct gb_svc *svc = gb_connection_get_data(connection);
1120         struct gb_interface *intf;
1121         u8 intf_id;
1122         u8 reason;
1123
1124         /* The request message size has already been verified. */
1125         request = operation->request->payload;
1126         intf_id = request->intf_id;
1127         reason = request->reason;
1128
1129         intf = gb_svc_interface_lookup(svc, intf_id);
1130         if (!intf) {
1131                 dev_warn(&svc->dev, "unexpected interface-oops event %u\n",
1132                          intf_id);
1133                 return;
1134         }
1135
1136         dev_info(&svc->dev, "Deactivating interface %u, interface oops reason = %u\n",
1137                  intf_id, reason);
1138
1139         mutex_lock(&intf->mutex);
1140         intf->disconnected = true;
1141         gb_interface_disable(intf);
1142         gb_interface_deactivate(intf);
1143         mutex_unlock(&intf->mutex);
1144 }
1145
1146 static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
1147 {
1148         struct gb_svc_intf_mailbox_event_request *request;
1149         struct gb_connection *connection = operation->connection;
1150         struct gb_svc *svc = gb_connection_get_data(connection);
1151         struct gb_interface *intf;
1152         u8 intf_id;
1153         u16 result_code;
1154         u32 mailbox;
1155
1156         /* The request message size has already been verified. */
1157         request = operation->request->payload;
1158         intf_id = request->intf_id;
1159         result_code = le16_to_cpu(request->result_code);
1160         mailbox = le32_to_cpu(request->mailbox);
1161
1162         dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
1163                         __func__, intf_id, result_code, mailbox);
1164
1165         intf = gb_svc_interface_lookup(svc, intf_id);
1166         if (!intf) {
1167                 dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
1168                 return;
1169         }
1170
1171         gb_interface_mailbox_event(intf, result_code, mailbox);
1172 }
1173
1174 static void gb_svc_process_deferred_request(struct work_struct *work)
1175 {
1176         struct gb_svc_deferred_request *dr;
1177         struct gb_operation *operation;
1178         struct gb_svc *svc;
1179         u8 type;
1180
1181         dr = container_of(work, struct gb_svc_deferred_request, work);
1182         operation = dr->operation;
1183         svc = gb_connection_get_data(operation->connection);
1184         type = operation->request->header->type;
1185
1186         switch (type) {
1187         case GB_SVC_TYPE_SVC_HELLO:
1188                 gb_svc_process_hello_deferred(operation);
1189                 break;
1190         case GB_SVC_TYPE_MODULE_INSERTED:
1191                 gb_svc_process_module_inserted(operation);
1192                 break;
1193         case GB_SVC_TYPE_MODULE_REMOVED:
1194                 gb_svc_process_module_removed(operation);
1195                 break;
1196         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1197                 gb_svc_process_intf_mailbox_event(operation);
1198                 break;
1199         case GB_SVC_TYPE_INTF_OOPS:
1200                 gb_svc_process_intf_oops(operation);
1201                 break;
1202         default:
1203                 dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
1204         }
1205
1206         gb_operation_put(operation);
1207         kfree(dr);
1208 }
1209
1210 static int gb_svc_queue_deferred_request(struct gb_operation *operation)
1211 {
1212         struct gb_svc *svc = gb_connection_get_data(operation->connection);
1213         struct gb_svc_deferred_request *dr;
1214
1215         dr = kmalloc(sizeof(*dr), GFP_KERNEL);
1216         if (!dr)
1217                 return -ENOMEM;
1218
1219         gb_operation_get(operation);
1220
1221         dr->operation = operation;
1222         INIT_WORK(&dr->work, gb_svc_process_deferred_request);
1223
1224         queue_work(svc->wq, &dr->work);
1225
1226         return 0;
1227 }
1228
1229 static int gb_svc_intf_reset_recv(struct gb_operation *op)
1230 {
1231         struct gb_svc *svc = gb_connection_get_data(op->connection);
1232         struct gb_message *request = op->request;
1233         struct gb_svc_intf_reset_request *reset;
1234         u8 intf_id;
1235
1236         if (request->payload_size < sizeof(*reset)) {
1237                 dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
1238                                 request->payload_size, sizeof(*reset));
1239                 return -EINVAL;
1240         }
1241         reset = request->payload;
1242
1243         intf_id = reset->intf_id;
1244
1245         /* FIXME Reset the interface here */
1246
1247         return 0;
1248 }
1249
1250 static int gb_svc_module_inserted_recv(struct gb_operation *op)
1251 {
1252         struct gb_svc *svc = gb_connection_get_data(op->connection);
1253         struct gb_svc_module_inserted_request *request;
1254
1255         if (op->request->payload_size < sizeof(*request)) {
1256                 dev_warn(&svc->dev, "short module-inserted request received (%zu < %zu)\n",
1257                                 op->request->payload_size, sizeof(*request));
1258                 return -EINVAL;
1259         }
1260
1261         request = op->request->payload;
1262
1263         dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1264                         request->primary_intf_id);
1265
1266         return gb_svc_queue_deferred_request(op);
1267 }
1268
1269 static int gb_svc_module_removed_recv(struct gb_operation *op)
1270 {
1271         struct gb_svc *svc = gb_connection_get_data(op->connection);
1272         struct gb_svc_module_removed_request *request;
1273
1274         if (op->request->payload_size < sizeof(*request)) {
1275                 dev_warn(&svc->dev, "short module-removed request received (%zu < %zu)\n",
1276                                 op->request->payload_size, sizeof(*request));
1277                 return -EINVAL;
1278         }
1279
1280         request = op->request->payload;
1281
1282         dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1283                         request->primary_intf_id);
1284
1285         return gb_svc_queue_deferred_request(op);
1286 }
1287
1288 static int gb_svc_intf_oops_recv(struct gb_operation *op)
1289 {
1290         struct gb_svc *svc = gb_connection_get_data(op->connection);
1291         struct gb_svc_intf_oops_request *request;
1292
1293         if (op->request->payload_size < sizeof(*request)) {
1294                 dev_warn(&svc->dev, "short intf-oops request received (%zu < %zu)\n",
1295                          op->request->payload_size, sizeof(*request));
1296                 return -EINVAL;
1297         }
1298
1299         return gb_svc_queue_deferred_request(op);
1300 }
1301
1302 static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op)
1303 {
1304         struct gb_svc *svc = gb_connection_get_data(op->connection);
1305         struct gb_svc_intf_mailbox_event_request *request;
1306
1307         if (op->request->payload_size < sizeof(*request)) {
1308                 dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n",
1309                                 op->request->payload_size, sizeof(*request));
1310                 return -EINVAL;
1311         }
1312
1313         request = op->request->payload;
1314
1315         dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
1316
1317         return gb_svc_queue_deferred_request(op);
1318 }
1319
1320 static int gb_svc_request_handler(struct gb_operation *op)
1321 {
1322         struct gb_connection *connection = op->connection;
1323         struct gb_svc *svc = gb_connection_get_data(connection);
1324         u8 type = op->type;
1325         int ret = 0;
1326
1327         /*
1328          * SVC requests need to follow a specific order (at least initially) and
1329          * below code takes care of enforcing that. The expected order is:
1330          * - PROTOCOL_VERSION
1331          * - SVC_HELLO
1332          * - Any other request, but the earlier two.
1333          *
1334          * Incoming requests are guaranteed to be serialized and so we don't
1335          * need to protect 'state' for any races.
1336          */
1337         switch (type) {
1338         case GB_SVC_TYPE_PROTOCOL_VERSION:
1339                 if (svc->state != GB_SVC_STATE_RESET)
1340                         ret = -EINVAL;
1341                 break;
1342         case GB_SVC_TYPE_SVC_HELLO:
1343                 if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
1344                         ret = -EINVAL;
1345                 break;
1346         default:
1347                 if (svc->state != GB_SVC_STATE_SVC_HELLO)
1348                         ret = -EINVAL;
1349                 break;
1350         }
1351
1352         if (ret) {
1353                 dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
1354                                 type, svc->state);
1355                 return ret;
1356         }
1357
1358         switch (type) {
1359         case GB_SVC_TYPE_PROTOCOL_VERSION:
1360                 ret = gb_svc_version_request(op);
1361                 if (!ret)
1362                         svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
1363                 return ret;
1364         case GB_SVC_TYPE_SVC_HELLO:
1365                 ret = gb_svc_hello(op);
1366                 if (!ret)
1367                         svc->state = GB_SVC_STATE_SVC_HELLO;
1368                 return ret;
1369         case GB_SVC_TYPE_INTF_RESET:
1370                 return gb_svc_intf_reset_recv(op);
1371         case GB_SVC_TYPE_MODULE_INSERTED:
1372                 return gb_svc_module_inserted_recv(op);
1373         case GB_SVC_TYPE_MODULE_REMOVED:
1374                 return gb_svc_module_removed_recv(op);
1375         case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1376                 return gb_svc_intf_mailbox_event_recv(op);
1377         case GB_SVC_TYPE_INTF_OOPS:
1378                 return gb_svc_intf_oops_recv(op);
1379         default:
1380                 dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
1381                 return -EINVAL;
1382         }
1383 }
1384
1385 static void gb_svc_release(struct device *dev)
1386 {
1387         struct gb_svc *svc = to_gb_svc(dev);
1388
1389         if (svc->connection)
1390                 gb_connection_destroy(svc->connection);
1391         ida_destroy(&svc->device_id_map);
1392         destroy_workqueue(svc->wq);
1393         kfree(svc);
1394 }
1395
1396 struct device_type greybus_svc_type = {
1397         .name           = "greybus_svc",
1398         .release        = gb_svc_release,
1399 };
1400
1401 struct gb_svc *gb_svc_create(struct gb_host_device *hd)
1402 {
1403         struct gb_svc *svc;
1404
1405         svc = kzalloc(sizeof(*svc), GFP_KERNEL);
1406         if (!svc)
1407                 return NULL;
1408
1409         svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev));
1410         if (!svc->wq) {
1411                 kfree(svc);
1412                 return NULL;
1413         }
1414
1415         svc->dev.parent = &hd->dev;
1416         svc->dev.bus = &greybus_bus_type;
1417         svc->dev.type = &greybus_svc_type;
1418         svc->dev.groups = svc_groups;
1419         svc->dev.dma_mask = svc->dev.parent->dma_mask;
1420         device_initialize(&svc->dev);
1421
1422         dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
1423
1424         ida_init(&svc->device_id_map);
1425         svc->state = GB_SVC_STATE_RESET;
1426         svc->hd = hd;
1427
1428         svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
1429                                                 gb_svc_request_handler);
1430         if (IS_ERR(svc->connection)) {
1431                 dev_err(&svc->dev, "failed to create connection: %ld\n",
1432                                 PTR_ERR(svc->connection));
1433                 goto err_put_device;
1434         }
1435
1436         gb_connection_set_data(svc->connection, svc);
1437
1438         return svc;
1439
1440 err_put_device:
1441         put_device(&svc->dev);
1442         return NULL;
1443 }
1444
1445 int gb_svc_add(struct gb_svc *svc)
1446 {
1447         int ret;
1448
1449         /*
1450          * The SVC protocol is currently driven by the SVC, so the SVC device
1451          * is added from the connection request handler when enough
1452          * information has been received.
1453          */
1454         ret = gb_connection_enable(svc->connection);
1455         if (ret)
1456                 return ret;
1457
1458         return 0;
1459 }
1460
1461 static void gb_svc_remove_modules(struct gb_svc *svc)
1462 {
1463         struct gb_host_device *hd = svc->hd;
1464         struct gb_module *module, *tmp;
1465
1466         list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) {
1467                 gb_module_del(module);
1468                 list_del(&module->hd_node);
1469                 gb_module_put(module);
1470         }
1471 }
1472
1473 void gb_svc_del(struct gb_svc *svc)
1474 {
1475         gb_connection_disable_rx(svc->connection);
1476
1477         /*
1478          * The SVC device may have been registered from the request handler.
1479          */
1480         if (device_is_registered(&svc->dev)) {
1481                 gb_timesync_svc_remove(svc);
1482                 gb_svc_debugfs_exit(svc);
1483                 gb_svc_watchdog_destroy(svc);
1484                 device_del(&svc->dev);
1485         }
1486
1487         flush_workqueue(svc->wq);
1488
1489         gb_svc_remove_modules(svc);
1490
1491         gb_connection_disable(svc->connection);
1492 }
1493
1494 void gb_svc_put(struct gb_svc *svc)
1495 {
1496         put_device(&svc->dev);
1497 }