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