drivers/staging/greybus/audio_module.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Greybus audio driver
   4  * Copyright 2015 Google Inc.
   5  * Copyright 2015 Linaro Ltd.
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <sound/soc.h>
  10 #include <sound/pcm_params.h>
  11
  12 #include "audio_codec.h"
  13 #include "audio_apbridgea.h"
  14 #include "audio_manager.h"
  15
  16 /*
  17  * gb_snd management functions
  18  */
  19
  20 static int gbaudio_request_jack(struct gbaudio_module_info *module,
  21                                 struct gb_audio_jack_event_request *req)
  22 {
  23         int report;
  24         struct snd_jack *jack = module->headset.jack.jack;
  25         struct snd_jack *btn_jack = module->button.jack.jack;
  26
  27         if (!jack) {
  28                 dev_err_ratelimited(module->dev,
  29                                     "Invalid jack event received:type: %u, event: %u\n",
  30                                     req->jack_attribute, req->event);
  31                 return -EINVAL;
  32         }
  33
  34         dev_warn_ratelimited(module->dev,
  35                              "Jack Event received: type: %u, event: %u\n",
  36                              req->jack_attribute, req->event);
  37
  38         if (req->event == GB_AUDIO_JACK_EVENT_REMOVAL) {
  39                 module->jack_type = 0;
  40                 if (btn_jack && module->button_status) {
  41                         snd_soc_jack_report(&module->button.jack, 0,
  42                                             module->button_mask);
  43                         module->button_status = 0;
  44                 }
  45                 snd_soc_jack_report(&module->headset.jack, 0,
  46                                     module->jack_mask);
  47                 return 0;
  48         }
  49
  50         report = req->jack_attribute & module->jack_mask;
  51         if (!report) {
  52                 dev_err_ratelimited(module->dev,
  53                                     "Invalid jack event received:type: %u, event: %u\n",
  54                                     req->jack_attribute, req->event);
  55                 return -EINVAL;
  56         }
  57
  58         if (module->jack_type)
  59                 dev_warn_ratelimited(module->dev,
  60                                      "Modifying jack from %d to %d\n",
  61                                      module->jack_type, report);
  62
  63         module->jack_type = report;
  64         snd_soc_jack_report(&module->headset.jack, report, module->jack_mask);
  65
  66         return 0;
  67 }
  68
  69 static int gbaudio_request_button(struct gbaudio_module_info *module,
  70                                   struct gb_audio_button_event_request *req)
  71 {
  72         int soc_button_id, report;
  73         struct snd_jack *btn_jack = module->button.jack.jack;
  74
  75         if (!btn_jack) {
  76                 dev_err_ratelimited(module->dev,
  77                                     "Invalid button event received:type: %u, event: %u\n",
  78                                     req->button_id, req->event);
  79                 return -EINVAL;
  80         }
  81
  82         dev_warn_ratelimited(module->dev,
  83                              "Button Event received: id: %u, event: %u\n",
  84                              req->button_id, req->event);
  85
  86         /* currently supports 4 buttons only */
  87         if (!module->jack_type) {
  88                 dev_err_ratelimited(module->dev,
  89                                     "Jack not present. Bogus event!!\n");
  90                 return -EINVAL;
  91         }
  92
  93         report = module->button_status & module->button_mask;
  94         soc_button_id = 0;
  95
  96         switch (req->button_id) {
  97         case 1:
  98                 soc_button_id = SND_JACK_BTN_0 & module->button_mask;
  99                 break;
 100
 101         case 2:
 102                 soc_button_id = SND_JACK_BTN_1 & module->button_mask;
 103                 break;
 104
 105         case 3:
 106                 soc_button_id = SND_JACK_BTN_2 & module->button_mask;
 107                 break;
 108
 109         case 4:
 110                 soc_button_id = SND_JACK_BTN_3 & module->button_mask;
 111                 break;
 112         }
 113
 114         if (!soc_button_id) {
 115                 dev_err_ratelimited(module->dev,
 116                                     "Invalid button request received\n");
 117                 return -EINVAL;
 118         }
 119
 120         if (req->event == GB_AUDIO_BUTTON_EVENT_PRESS)
 121                 report = report | soc_button_id;
 122         else
 123                 report = report & ~soc_button_id;
 124
 125         module->button_status = report;
 126
 127         snd_soc_jack_report(&module->button.jack, report, module->button_mask);
 128
 129         return 0;
 130 }
 131
 132 static int gbaudio_request_stream(struct gbaudio_module_info *module,
 133                                   struct gb_audio_streaming_event_request *req)
 134 {
 135         dev_warn(module->dev, "Audio Event received: cport: %u, event: %u\n",
 136                  le16_to_cpu(req->data_cport), req->event);
 137
 138         return 0;
 139 }
 140
 141 static int gbaudio_codec_request_handler(struct gb_operation *op)
 142 {
 143         struct gb_connection *connection = op->connection;
 144         struct gbaudio_module_info *module =
 145                 greybus_get_drvdata(connection->bundle);
 146         struct gb_operation_msg_hdr *header = op->request->header;
 147         struct gb_audio_streaming_event_request *stream_req;
 148         struct gb_audio_jack_event_request *jack_req;
 149         struct gb_audio_button_event_request *button_req;
 150         int ret;
 151
 152         switch (header->type) {
 153         case GB_AUDIO_TYPE_STREAMING_EVENT:
 154                 stream_req = op->request->payload;
 155                 ret = gbaudio_request_stream(module, stream_req);
 156                 break;
 157
 158         case GB_AUDIO_TYPE_JACK_EVENT:
 159                 jack_req = op->request->payload;
 160                 ret = gbaudio_request_jack(module, jack_req);
 161                 break;
 162
 163         case GB_AUDIO_TYPE_BUTTON_EVENT:
 164                 button_req = op->request->payload;
 165                 ret = gbaudio_request_button(module, button_req);
 166                 break;
 167
 168         default:
 169                 dev_err_ratelimited(&connection->bundle->dev,
 170                                     "Invalid Audio Event received\n");
 171                 return -EINVAL;
 172         }
 173
 174         return ret;
 175 }
 176
 177 static int gb_audio_add_mgmt_connection(struct gbaudio_module_info *gbmodule,
 178                                         struct greybus_descriptor_cport *cport_desc,
 179                                         struct gb_bundle *bundle)
 180 {
 181         struct gb_connection *connection;
 182
 183         /* Management Cport */
 184         if (gbmodule->mgmt_connection) {
 185                 dev_err(&bundle->dev,
 186                         "Can't have multiple Management connections\n");
 187                 return -ENODEV;
 188         }
 189
 190         connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id),
 191                                           gbaudio_codec_request_handler);
 192         if (IS_ERR(connection))
 193                 return PTR_ERR(connection);
 194
 195         greybus_set_drvdata(bundle, gbmodule);
 196         gbmodule->mgmt_connection = connection;
 197
 198         return 0;
 199 }
 200
 201 static int gb_audio_add_data_connection(struct gbaudio_module_info *gbmodule,
 202                                         struct greybus_descriptor_cport *cport_desc,
 203                                         struct gb_bundle *bundle)
 204 {
 205         struct gb_connection *connection;
 206         struct gbaudio_data_connection *dai;
 207
 208         dai = devm_kzalloc(gbmodule->dev, sizeof(*dai), GFP_KERNEL);
 209         if (!dai)
 210                 return -ENOMEM;
 211
 212         connection = gb_connection_create_offloaded(bundle,
 213                                                     le16_to_cpu(cport_desc->id),
 214                                                     GB_CONNECTION_FLAG_CSD);
 215         if (IS_ERR(connection)) {
 216                 devm_kfree(gbmodule->dev, dai);
 217                 return PTR_ERR(connection);
 218         }
 219
 220         greybus_set_drvdata(bundle, gbmodule);
 221         dai->id = 0;
 222         dai->data_cport = cpu_to_le16(connection->intf_cport_id);
 223         dai->connection = connection;
 224         list_add(&dai->list, &gbmodule->data_list);
 225
 226         return 0;
 227 }
 228
 229 /*
 230  * This is the basic hook get things initialized and registered w/ gb
 231  */
 232
 233 static int gb_audio_probe(struct gb_bundle *bundle,
 234                           const struct greybus_bundle_id *id)
 235 {
 236         struct device *dev = &bundle->dev;
 237         struct gbaudio_module_info *gbmodule;
 238         struct greybus_descriptor_cport *cport_desc;
 239         struct gb_audio_manager_module_descriptor desc;
 240         struct gbaudio_data_connection *dai, *_dai;
 241         int ret, i;
 242         struct gb_audio_topology *topology;
 243
 244         /* There should be at least one Management and one Data cport */
 245         if (bundle->num_cports < 2)
 246                 return -ENODEV;
 247
 248         /*
 249          * There can be only one Management connection and any number of data
 250          * connections.
 251          */
 252         gbmodule = devm_kzalloc(dev, sizeof(*gbmodule), GFP_KERNEL);
 253         if (!gbmodule)
 254                 return -ENOMEM;
 255
 256         gbmodule->num_data_connections = bundle->num_cports - 1;
 257         INIT_LIST_HEAD(&gbmodule->data_list);
 258         INIT_LIST_HEAD(&gbmodule->widget_list);
 259         INIT_LIST_HEAD(&gbmodule->ctl_list);
 260         INIT_LIST_HEAD(&gbmodule->widget_ctl_list);
 261         INIT_LIST_HEAD(&gbmodule->jack_list);
 262         gbmodule->dev = dev;
 263         snprintf(gbmodule->name, sizeof(gbmodule->name), "%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, le16_to_cpu(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         strscpy(desc.name, gbmodule->name, sizeof(desc.name));
 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, le16_to_cpu(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 <[email protected]>");
 478 MODULE_LICENSE("GPL v2");
 479 MODULE_ALIAS("platform:gbaudio-module");