drivers/staging/greybus/audio_module.c

   1 /*
   2  * Greybus audio driver
   3  * Copyright 2015 Google Inc.
   4  * Copyright 2015 Linaro Ltd.
   5  *
   6  * Released under the GPLv2 only.
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <sound/soc.h>
  11 #include <sound/pcm_params.h>
  12
  13 #include "audio_codec.h"
  14 #include "audio_apbridgea.h"
  15 #include "audio_manager.h"
  16
  17 /*
  18  * gb_snd management functions
  19  */
  20
  21 static int gbaudio_request_jack(struct gbaudio_module_info *module,
  22                                   struct gb_audio_jack_event_request *req)
  23 {
  24         int report;
  25         struct snd_jack *jack = module->headset_jack.jack;
  26         struct snd_jack *btn_jack = module->button_jack.jack;
  27
  28         if (!jack) {
  29                 dev_err_ratelimited(module->dev,
  30                         "Invalid jack event received:type: %u, event: %u\n",
  31                         req->jack_attribute, req->event);
  32                 return -EINVAL;
  33         }
  34
  35         dev_warn_ratelimited(module->dev,
  36                              "Jack Event received: type: %u, event: %u\n",
  37                              req->jack_attribute, req->event);
  38
  39         if (req->event == GB_AUDIO_JACK_EVENT_REMOVAL) {
  40                 module->jack_type = 0;
  41                 if (btn_jack && module->button_status) {
  42                         snd_soc_jack_report(&module->button_jack, 0,
  43                                             module->button_mask);
  44                         module->button_status = 0;
  45                 }
  46                 snd_soc_jack_report(&module->headset_jack, 0,
  47                                     module->jack_mask);
  48                 return 0;
  49         }
  50
  51         report = req->jack_attribute & module->jack_mask;
  52         if (!report) {
  53                 dev_err_ratelimited(module->dev,
  54                         "Invalid jack event received:type: %u, event: %u\n",
  55                         req->jack_attribute, req->event);
  56                 return -EINVAL;
  57         }
  58
  59         if (module->jack_type)
  60                 dev_warn_ratelimited(module->dev,
  61                                      "Modifying jack from %d to %d\n",
  62                                      module->jack_type, report);
  63
  64         module->jack_type = report;
  65         snd_soc_jack_report(&module->headset_jack, report, module->jack_mask);
  66
  67         return 0;
  68 }
  69
  70 static int gbaudio_request_button(struct gbaudio_module_info *module,
  71                                   struct gb_audio_button_event_request *req)
  72 {
  73         int soc_button_id, report;
  74         struct snd_jack *btn_jack = module->button_jack.jack;
  75
  76         if (!btn_jack) {
  77                 dev_err_ratelimited(module->dev,
  78                         "Invalid button event received:type: %u, event: %u\n",
  79                         req->button_id, req->event);
  80                 return -EINVAL;
  81         }
  82
  83         dev_warn_ratelimited(module->dev,
  84                              "Button Event received: id: %u, event: %u\n",
  85                              req->button_id, req->event);
  86
  87         /* currently supports 4 buttons only */
  88         if (!module->jack_type) {
  89                 dev_err_ratelimited(module->dev,
  90                                     "Jack not present. Bogus event!!\n");
  91                 return -EINVAL;
  92         }
  93
  94         report = module->button_status & module->button_mask;
  95         soc_button_id = 0;
  96
  97         switch (req->button_id) {
  98         case 1:
  99                 soc_button_id = SND_JACK_BTN_0 & module->button_mask;
 100                 break;
 101
 102         case 2:
 103                 soc_button_id = SND_JACK_BTN_1 & module->button_mask;
 104                 break;
 105
 106         case 3:
 107                 soc_button_id = SND_JACK_BTN_2 & module->button_mask;
 108                 break;
 109
 110         case 4:
 111                 soc_button_id = SND_JACK_BTN_3 & module->button_mask;
 112                 break;
 113         }
 114
 115         if (!soc_button_id) {
 116                 dev_err_ratelimited(module->dev,
 117                                     "Invalid button request received\n");
 118                 return -EINVAL;
 119         }
 120
 121         if (req->event == GB_AUDIO_BUTTON_EVENT_PRESS)
 122                 report = report | soc_button_id;
 123         else
 124                 report = report & ~soc_button_id;
 125
 126         module->button_status = report;
 127
 128         snd_soc_jack_report(&module->button_jack, report, module->button_mask);
 129
 130         return 0;
 131 }
 132
 133 static int gbaudio_request_stream(struct gbaudio_module_info *module,
 134                                   struct gb_audio_streaming_event_request *req)
 135 {
 136         dev_warn(module->dev, "Audio Event received: cport: %u, event: %u\n",
 137                  le16_to_cpu(req->data_cport), req->event);
 138
 139         return 0;
 140 }
 141
 142 static int gbaudio_codec_request_handler(struct gb_operation *op)
 143 {
 144         struct gb_connection *connection = op->connection;
 145         struct gbaudio_module_info *module =
 146                 greybus_get_drvdata(connection->bundle);
 147         struct gb_operation_msg_hdr *header = op->request->header;
 148         struct gb_audio_streaming_event_request *stream_req;
 149         struct gb_audio_jack_event_request *jack_req;
 150         struct gb_audio_button_event_request *button_req;
 151         int ret;
 152
 153         switch (header->type) {
 154         case GB_AUDIO_TYPE_STREAMING_EVENT:
 155                 stream_req = op->request->payload;
 156                 ret = gbaudio_request_stream(module, stream_req);
 157                 break;
 158
 159         case GB_AUDIO_TYPE_JACK_EVENT:
 160                 jack_req = op->request->payload;
 161                 ret = gbaudio_request_jack(module, jack_req);
 162                 break;
 163
 164         case GB_AUDIO_TYPE_BUTTON_EVENT:
 165                 button_req = op->request->payload;
 166                 ret = gbaudio_request_button(module, button_req);
 167                 break;
 168
 169         default:
 170                 dev_err_ratelimited(&connection->bundle->dev,
 171                                     "Invalid Audio Event received\n");
 172                 return -EINVAL;
 173         }
 174
 175         return ret;
 176 }
 177
 178 static int gb_audio_add_mgmt_connection(struct gbaudio_module_info *gbmodule,
 179                                 struct greybus_descriptor_cport *cport_desc,
 180                                 struct gb_bundle *bundle)
 181 {
 182         struct gb_connection *connection;
 183
 184         /* Management Cport */
 185         if (gbmodule->mgmt_connection) {
 186                 dev_err(&bundle->dev,
 187                         "Can't have multiple Management connections\n");
 188                 return -ENODEV;
 189         }
 190
 191         connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id),
 192                                           gbaudio_codec_request_handler);
 193         if (IS_ERR(connection))
 194                 return PTR_ERR(connection);
 195
 196         greybus_set_drvdata(bundle, gbmodule);
 197         gbmodule->mgmt_connection = connection;
 198
 199         return 0;
 200 }
 201
 202 static int gb_audio_add_data_connection(struct gbaudio_module_info *gbmodule,
 203                                 struct greybus_descriptor_cport *cport_desc,
 204                                 struct gb_bundle *bundle)
 205 {
 206         struct gb_connection *connection;
 207         struct gbaudio_data_connection *dai;
 208
 209         dai = devm_kzalloc(gbmodule->dev, sizeof(*dai), GFP_KERNEL);
 210         if (!dai)
 211                 return -ENOMEM;
 212
 213         connection = gb_connection_create_offloaded(bundle,
 214                                         le16_to_cpu(cport_desc->id),
 215                                         GB_CONNECTION_FLAG_CSD);
 216         if (IS_ERR(connection)) {
 217                 devm_kfree(gbmodule->dev, dai);
 218                 return PTR_ERR(connection);
 219         }
 220
 221         greybus_set_drvdata(bundle, gbmodule);
 222         dai->id = 0;
 223         dai->data_cport = connection->intf_cport_id;
 224         dai->connection = connection;
 225         list_add(&dai->list, &gbmodule->data_list);
 226
 227         return 0;
 228 }
 229
 230 /*
 231  * This is the basic hook get things initialized and registered w/ gb
 232  */
 233
 234 static int gb_audio_probe(struct gb_bundle *bundle,
 235                           const struct greybus_bundle_id *id)
 236 {
 237         struct device *dev = &bundle->dev;
 238         struct gbaudio_module_info *gbmodule;
 239         struct greybus_descriptor_cport *cport_desc;
 240         struct gb_audio_manager_module_descriptor desc;
 241         struct gbaudio_data_connection *dai, *_dai;
 242         int ret, i;
 243         struct gb_audio_topology *topology;
 244
 245         /* There should be at least one Management and one Data cport */
 246         if (bundle->num_cports < 2)
 247                 return -ENODEV;
 248
 249         /*
 250          * There can be only one Management connection and any number of data
 251          * connections.
 252          */
 253         gbmodule = devm_kzalloc(dev, sizeof(*gbmodule), GFP_KERNEL);
 254         if (!gbmodule)
 255                 return -ENOMEM;
 256
 257         gbmodule->num_data_connections = bundle->num_cports - 1;
 258         INIT_LIST_HEAD(&gbmodule->data_list);
 259         INIT_LIST_HEAD(&gbmodule->widget_list);
 260         INIT_LIST_HEAD(&gbmodule->ctl_list);
 261         INIT_LIST_HEAD(&gbmodule->widget_ctl_list);
 262         gbmodule->dev = dev;
 263         snprintf(gbmodule->name, NAME_SIZE, "%s.%s", dev->driver->name,
 264                  dev_name(dev));
 265         greybus_set_drvdata(bundle, gbmodule);
 266
 267         /* Create all connections */
 268         for (i = 0; i < bundle->num_cports; i++) {
 269                 cport_desc = &bundle->cport_desc[i];
 270
 271                 switch (cport_desc->protocol_id) {
 272                 case GREYBUS_PROTOCOL_AUDIO_MGMT:
 273                         ret = gb_audio_add_mgmt_connection(gbmodule, cport_desc,
 274                                                            bundle);
 275                         if (ret)
 276                                 goto destroy_connections;
 277                         break;
 278                 case GREYBUS_PROTOCOL_AUDIO_DATA:
 279                         ret = gb_audio_add_data_connection(gbmodule, cport_desc,
 280                                                            bundle);
 281                         if (ret)
 282                                 goto destroy_connections;
 283                         break;
 284                 default:
 285                         dev_err(dev, "Unsupported protocol: 0x%02x\n",
 286                                 cport_desc->protocol_id);
 287                         ret = -ENODEV;
 288                         goto destroy_connections;
 289                 }
 290         }
 291
 292         /* There must be a management cport */
 293         if (!gbmodule->mgmt_connection) {
 294                 ret = -EINVAL;
 295                 dev_err(dev, "Missing management connection\n");
 296                 goto destroy_connections;
 297         }
 298
 299         /* Initialize management connection */
 300         ret = gb_connection_enable(gbmodule->mgmt_connection);
 301         if (ret) {
 302                 dev_err(dev, "%d: Error while enabling mgmt connection\n", ret);
 303                 goto destroy_connections;
 304         }
 305         gbmodule->dev_id = gbmodule->mgmt_connection->intf->interface_id;
 306
 307         /*
 308          * FIXME: malloc for topology happens via audio_gb driver
 309          * should be done within codec driver itself
 310          */
 311         ret = gb_audio_gb_get_topology(gbmodule->mgmt_connection, &topology);
 312         if (ret) {
 313                 dev_err(dev, "%d:Error while fetching topology\n", ret);
 314                 goto disable_connection;
 315         }
 316
 317         /* process topology data */
 318         ret = gbaudio_tplg_parse_data(gbmodule, topology);
 319         if (ret) {
 320                 dev_err(dev, "%d:Error while parsing topology data\n",
 321                           ret);
 322                 goto free_topology;
 323         }
 324         gbmodule->topology = topology;
 325
 326         /* Initialize data connections */
 327         list_for_each_entry(dai, &gbmodule->data_list, list) {
 328                 ret = gb_connection_enable(dai->connection);
 329                 if (ret) {
 330                         dev_err(dev,
 331                                 "%d:Error while enabling %d:data connection\n",
 332                                 ret, dai->data_cport);
 333                         goto disable_data_connection;
 334                 }
 335         }
 336
 337         /* register module with gbcodec */
 338         ret = gbaudio_register_module(gbmodule);
 339         if (ret)
 340                 goto disable_data_connection;
 341
 342         /* inform above layer for uevent */
 343         dev_dbg(dev, "Inform set_event:%d to above layer\n", 1);
 344         /* prepare for the audio manager */
 345         strlcpy(desc.name, gbmodule->name, GB_AUDIO_MANAGER_MODULE_NAME_LEN);
 346         desc.vid = 2; /* todo */
 347         desc.pid = 3; /* todo */
 348         desc.intf_id = gbmodule->dev_id;
 349         desc.op_devices = gbmodule->op_devices;
 350         desc.ip_devices = gbmodule->ip_devices;
 351         gbmodule->manager_id = gb_audio_manager_add(&desc);
 352
 353         dev_dbg(dev, "Add GB Audio device:%s\n", gbmodule->name);
 354
 355         gb_pm_runtime_put_autosuspend(bundle);
 356
 357         return 0;
 358
 359 disable_data_connection:
 360         list_for_each_entry_safe(dai, _dai, &gbmodule->data_list, list)
 361                 gb_connection_disable(dai->connection);
 362         gbaudio_tplg_release(gbmodule);
 363         gbmodule->topology = NULL;
 364
 365 free_topology:
 366         kfree(topology);
 367
 368 disable_connection:
 369         gb_connection_disable(gbmodule->mgmt_connection);
 370
 371 destroy_connections:
 372         list_for_each_entry_safe(dai, _dai, &gbmodule->data_list, list) {
 373                 gb_connection_destroy(dai->connection);
 374                 list_del(&dai->list);
 375                 devm_kfree(dev, dai);
 376         }
 377
 378         if (gbmodule->mgmt_connection)
 379                 gb_connection_destroy(gbmodule->mgmt_connection);
 380
 381         devm_kfree(dev, gbmodule);
 382
 383         return ret;
 384 }
 385
 386 static void gb_audio_disconnect(struct gb_bundle *bundle)
 387 {
 388         struct gbaudio_module_info *gbmodule = greybus_get_drvdata(bundle);
 389         struct gbaudio_data_connection *dai, *_dai;
 390
 391         gb_pm_runtime_get_sync(bundle);
 392
 393         /* cleanup module related resources first */
 394         gbaudio_unregister_module(gbmodule);
 395
 396         /* inform uevent to above layers */
 397         gb_audio_manager_remove(gbmodule->manager_id);
 398
 399         gbaudio_tplg_release(gbmodule);
 400         kfree(gbmodule->topology);
 401         gbmodule->topology = NULL;
 402         gb_connection_disable(gbmodule->mgmt_connection);
 403         list_for_each_entry_safe(dai, _dai, &gbmodule->data_list, list) {
 404                 gb_connection_disable(dai->connection);
 405                 gb_connection_destroy(dai->connection);
 406                 list_del(&dai->list);
 407                 devm_kfree(gbmodule->dev, dai);
 408         }
 409         gb_connection_destroy(gbmodule->mgmt_connection);
 410         gbmodule->mgmt_connection = NULL;
 411
 412         devm_kfree(&bundle->dev, gbmodule);
 413 }
 414
 415 static const struct greybus_bundle_id gb_audio_id_table[] = {
 416         { GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_AUDIO) },
 417         { }
 418 };
 419 MODULE_DEVICE_TABLE(greybus, gb_audio_id_table);
 420
 421 #ifdef CONFIG_PM
 422 static int gb_audio_suspend(struct device *dev)
 423 {
 424         struct gb_bundle *bundle = to_gb_bundle(dev);
 425         struct gbaudio_module_info *gbmodule = greybus_get_drvdata(bundle);
 426         struct gbaudio_data_connection *dai;
 427
 428         list_for_each_entry(dai, &gbmodule->data_list, list)
 429                 gb_connection_disable(dai->connection);
 430
 431         gb_connection_disable(gbmodule->mgmt_connection);
 432
 433         return 0;
 434 }
 435
 436 static int gb_audio_resume(struct device *dev)
 437 {
 438         struct gb_bundle *bundle = to_gb_bundle(dev);
 439         struct gbaudio_module_info *gbmodule = greybus_get_drvdata(bundle);
 440         struct gbaudio_data_connection *dai;
 441         int ret;
 442
 443         ret = gb_connection_enable(gbmodule->mgmt_connection);
 444         if (ret) {
 445                 dev_err(dev, "%d:Error while enabling mgmt connection\n", ret);
 446                 return ret;
 447         }
 448
 449         list_for_each_entry(dai, &gbmodule->data_list, list) {
 450                 ret = gb_connection_enable(dai->connection);
 451                 if (ret) {
 452                         dev_err(dev,
 453                                 "%d:Error while enabling %d:data connection\n",
 454                                 ret, dai->data_cport);
 455                         return ret;
 456                 }
 457         }
 458
 459         return 0;
 460 }
 461 #endif
 462
 463 static const struct dev_pm_ops gb_audio_pm_ops = {
 464         SET_RUNTIME_PM_OPS(gb_audio_suspend, gb_audio_resume, NULL)
 465 };
 466
 467 static struct greybus_driver gb_audio_driver = {
 468         .name           = "gb-audio",
 469         .probe          = gb_audio_probe,
 470         .disconnect     = gb_audio_disconnect,
 471         .id_table       = gb_audio_id_table,
 472         .driver.pm      = &gb_audio_pm_ops,
 473 };
 474 module_greybus_driver(gb_audio_driver);
 475
 476 MODULE_DESCRIPTION("Greybus Audio module driver");
 477 MODULE_AUTHOR("Vaibhav Agarwal <vaibhav.agarwal@linaro.org>");
 478 MODULE_LICENSE("GPL v2");
 479 MODULE_ALIAS("platform:gbaudio-module");