sound/soc/soc-compress.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // soc-compress.c  --  ALSA SoC Compress
   4 //
   5 // Copyright (C) 2012 Intel Corp.
   6 //
   7 // Authors: Namarta Kohli <namartax.kohli@intel.com>
   8 //          Ramesh Babu K V <ramesh.babu@linux.intel.com>
   9 //          Vinod Koul <vinod.koul@linux.intel.com>
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/delay.h>
  14 #include <linux/slab.h>
  15 #include <linux/workqueue.h>
  16 #include <sound/core.h>
  17 #include <sound/compress_params.h>
  18 #include <sound/compress_driver.h>
  19 #include <sound/soc.h>
  20 #include <sound/initval.h>
  21 #include <sound/soc-dpcm.h>
  22 #include <sound/soc-link.h>
  23
  24 static int snd_soc_compr_components_open(struct snd_compr_stream *cstream)
  25 {
  26         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
  27         struct snd_soc_component *component;
  28         int ret = 0;
  29         int i;
  30
  31         for_each_rtd_components(rtd, i, component) {
  32                 ret = snd_soc_component_module_get_when_open(component, cstream);
  33                 if (ret < 0)
  34                         break;
  35
  36                 ret = snd_soc_component_compr_open(component, cstream);
  37                 if (ret < 0)
  38                         break;
  39         }
  40
  41         return ret;
  42 }
  43
  44 static void snd_soc_compr_components_free(struct snd_compr_stream *cstream,
  45                                           int rollback)
  46 {
  47         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
  48         struct snd_soc_component *component;
  49         int i;
  50
  51         for_each_rtd_components(rtd, i, component) {
  52                 snd_soc_component_compr_free(component, cstream, rollback);
  53                 snd_soc_component_module_put_when_close(component, cstream, rollback);
  54         }
  55 }
  56
  57 static int soc_compr_clean(struct snd_compr_stream *cstream, int rollback)
  58 {
  59         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
  60         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
  61         struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
  62         int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
  63
  64         snd_soc_dpcm_mutex_lock(rtd);
  65
  66         if (!rollback)
  67                 snd_soc_runtime_deactivate(rtd, stream);
  68
  69         snd_soc_dai_digital_mute(codec_dai, 1, stream);
  70
  71         if (!snd_soc_dai_active(cpu_dai))
  72                 cpu_dai->symmetric_rate = 0;
  73
  74         if (!snd_soc_dai_active(codec_dai))
  75                 codec_dai->symmetric_rate = 0;
  76
  77         snd_soc_link_compr_shutdown(cstream, rollback);
  78
  79         snd_soc_compr_components_free(cstream, rollback);
  80
  81         snd_soc_dai_compr_shutdown(cpu_dai, cstream, rollback);
  82
  83         if (!rollback)
  84                 snd_soc_dapm_stream_stop(rtd, stream);
  85
  86         snd_soc_dpcm_mutex_unlock(rtd);
  87
  88         snd_soc_pcm_component_pm_runtime_put(rtd, cstream, rollback);
  89
  90         return 0;
  91 }
  92
  93 static int soc_compr_free(struct snd_compr_stream *cstream)
  94 {
  95         return soc_compr_clean(cstream, 0);
  96 }
  97
  98 static int soc_compr_open(struct snd_compr_stream *cstream)
  99 {
 100         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 101         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 102         int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
 103         int ret;
 104
 105         ret = snd_soc_pcm_component_pm_runtime_get(rtd, cstream);
 106         if (ret < 0)
 107                 goto err_no_lock;
 108
 109         snd_soc_dpcm_mutex_lock(rtd);
 110
 111         ret = snd_soc_dai_compr_startup(cpu_dai, cstream);
 112         if (ret < 0)
 113                 goto err;
 114
 115         ret = snd_soc_compr_components_open(cstream);
 116         if (ret < 0)
 117                 goto err;
 118
 119         ret = snd_soc_link_compr_startup(cstream);
 120         if (ret < 0)
 121                 goto err;
 122
 123         snd_soc_runtime_activate(rtd, stream);
 124 err:
 125         snd_soc_dpcm_mutex_unlock(rtd);
 126 err_no_lock:
 127         if (ret < 0)
 128                 soc_compr_clean(cstream, 1);
 129
 130         return ret;
 131 }
 132
 133 static int soc_compr_open_fe(struct snd_compr_stream *cstream)
 134 {
 135         struct snd_soc_pcm_runtime *fe = cstream->private_data;
 136         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(fe, 0);
 137         struct snd_soc_dpcm *dpcm;
 138         struct snd_soc_dapm_widget_list *list;
 139         int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
 140         int ret;
 141
 142         snd_soc_card_mutex_lock(fe->card);
 143
 144         ret = dpcm_path_get(fe, stream, &list);
 145         if (ret < 0)
 146                 goto be_err;
 147
 148         snd_soc_dpcm_mutex_lock(fe);
 149
 150         /* calculate valid and active FE <-> BE dpcms */
 151         dpcm_process_paths(fe, stream, &list, 1);
 152
 153         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
 154
 155         ret = dpcm_be_dai_startup(fe, stream);
 156         if (ret < 0) {
 157                 /* clean up all links */
 158                 for_each_dpcm_be(fe, stream, dpcm)
 159                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 160
 161                 dpcm_be_disconnect(fe, stream);
 162                 goto out;
 163         }
 164
 165         ret = snd_soc_dai_compr_startup(cpu_dai, cstream);
 166         if (ret < 0)
 167                 goto out;
 168
 169         ret = snd_soc_compr_components_open(cstream);
 170         if (ret < 0)
 171                 goto open_err;
 172
 173         ret = snd_soc_link_compr_startup(cstream);
 174         if (ret < 0)
 175                 goto machine_err;
 176
 177         dpcm_clear_pending_state(fe, stream);
 178         dpcm_path_put(&list);
 179
 180         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
 181         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
 182
 183         snd_soc_runtime_activate(fe, stream);
 184         snd_soc_dpcm_mutex_unlock(fe);
 185
 186         snd_soc_card_mutex_unlock(fe->card);
 187
 188         return 0;
 189
 190 machine_err:
 191         snd_soc_compr_components_free(cstream, 1);
 192 open_err:
 193         snd_soc_dai_compr_shutdown(cpu_dai, cstream, 1);
 194 out:
 195         dpcm_path_put(&list);
 196         snd_soc_dpcm_mutex_unlock(fe);
 197 be_err:
 198         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
 199         snd_soc_card_mutex_unlock(fe->card);
 200         return ret;
 201 }
 202
 203 static int soc_compr_free_fe(struct snd_compr_stream *cstream)
 204 {
 205         struct snd_soc_pcm_runtime *fe = cstream->private_data;
 206         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(fe, 0);
 207         struct snd_soc_dpcm *dpcm;
 208         int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
 209
 210         snd_soc_card_mutex_lock(fe->card);
 211
 212         snd_soc_dpcm_mutex_lock(fe);
 213         snd_soc_runtime_deactivate(fe, stream);
 214
 215         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
 216
 217         dpcm_be_dai_hw_free(fe, stream);
 218
 219         dpcm_be_dai_shutdown(fe, stream);
 220
 221         /* mark FE's links ready to prune */
 222         for_each_dpcm_be(fe, stream, dpcm)
 223                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 224
 225         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
 226
 227         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
 228         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
 229
 230         dpcm_be_disconnect(fe, stream);
 231
 232         snd_soc_dpcm_mutex_unlock(fe);
 233
 234         snd_soc_link_compr_shutdown(cstream, 0);
 235
 236         snd_soc_compr_components_free(cstream, 0);
 237
 238         snd_soc_dai_compr_shutdown(cpu_dai, cstream, 0);
 239
 240         snd_soc_card_mutex_unlock(fe->card);
 241         return 0;
 242 }
 243
 244 static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
 245 {
 246         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 247         struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
 248         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 249         int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
 250         int ret;
 251
 252         snd_soc_dpcm_mutex_lock(rtd);
 253
 254         ret = snd_soc_component_compr_trigger(cstream, cmd);
 255         if (ret < 0)
 256                 goto out;
 257
 258         ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd);
 259         if (ret < 0)
 260                 goto out;
 261
 262         switch (cmd) {
 263         case SNDRV_PCM_TRIGGER_START:
 264                 snd_soc_dai_digital_mute(codec_dai, 0, stream);
 265                 break;
 266         case SNDRV_PCM_TRIGGER_STOP:
 267                 snd_soc_dai_digital_mute(codec_dai, 1, stream);
 268                 break;
 269         }
 270
 271 out:
 272         snd_soc_dpcm_mutex_unlock(rtd);
 273         return ret;
 274 }
 275
 276 static int soc_compr_trigger_fe(struct snd_compr_stream *cstream, int cmd)
 277 {
 278         struct snd_soc_pcm_runtime *fe = cstream->private_data;
 279         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(fe, 0);
 280         int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
 281         int ret;
 282
 283         if (cmd == SND_COMPR_TRIGGER_PARTIAL_DRAIN ||
 284             cmd == SND_COMPR_TRIGGER_DRAIN)
 285                 return snd_soc_component_compr_trigger(cstream, cmd);
 286
 287         snd_soc_card_mutex_lock(fe->card);
 288
 289         ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd);
 290         if (ret < 0)
 291                 goto out;
 292
 293         ret = snd_soc_component_compr_trigger(cstream, cmd);
 294         if (ret < 0)
 295                 goto out;
 296
 297         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
 298
 299         ret = dpcm_be_dai_trigger(fe, stream, cmd);
 300
 301         switch (cmd) {
 302         case SNDRV_PCM_TRIGGER_START:
 303         case SNDRV_PCM_TRIGGER_RESUME:
 304         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 305                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
 306                 break;
 307         case SNDRV_PCM_TRIGGER_STOP:
 308         case SNDRV_PCM_TRIGGER_SUSPEND:
 309                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
 310                 break;
 311         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 312                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
 313                 break;
 314         }
 315
 316 out:
 317         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
 318         snd_soc_card_mutex_unlock(fe->card);
 319         return ret;
 320 }
 321
 322 static int soc_compr_set_params(struct snd_compr_stream *cstream,
 323                                 struct snd_compr_params *params)
 324 {
 325         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 326         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 327         int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
 328         int ret;
 329
 330         snd_soc_dpcm_mutex_lock(rtd);
 331
 332         /*
 333          * First we call set_params for the CPU DAI, then the component
 334          * driver this should configure the SoC side. If the machine has
 335          * compressed ops then we call that as well. The expectation is
 336          * that these callbacks will configure everything for this compress
 337          * path, like configuring a PCM port for a CODEC.
 338          */
 339         ret = snd_soc_dai_compr_set_params(cpu_dai, cstream, params);
 340         if (ret < 0)
 341                 goto err;
 342
 343         ret = snd_soc_component_compr_set_params(cstream, params);
 344         if (ret < 0)
 345                 goto err;
 346
 347         ret = snd_soc_link_compr_set_params(cstream);
 348         if (ret < 0)
 349                 goto err;
 350
 351         snd_soc_dapm_stream_event(rtd, stream, SND_SOC_DAPM_STREAM_START);
 352
 353         /* cancel any delayed stream shutdown that is pending */
 354         rtd->pop_wait = 0;
 355         snd_soc_dpcm_mutex_unlock(rtd);
 356
 357         cancel_delayed_work_sync(&rtd->delayed_work);
 358
 359         return 0;
 360
 361 err:
 362         snd_soc_dpcm_mutex_unlock(rtd);
 363         return ret;
 364 }
 365
 366 static int soc_compr_set_params_fe(struct snd_compr_stream *cstream,
 367                                    struct snd_compr_params *params)
 368 {
 369         struct snd_soc_pcm_runtime *fe = cstream->private_data;
 370         struct snd_pcm_substream *fe_substream =
 371                  fe->pcm->streams[cstream->direction].substream;
 372         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(fe, 0);
 373         int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
 374         int ret;
 375
 376         snd_soc_card_mutex_lock(fe->card);
 377
 378         /*
 379          * Create an empty hw_params for the BE as the machine driver must
 380          * fix this up to match DSP decoder and ASRC configuration.
 381          * I.e. machine driver fixup for compressed BE is mandatory.
 382          */
 383         memset(&fe->dpcm[fe_substream->stream].hw_params, 0,
 384                 sizeof(struct snd_pcm_hw_params));
 385
 386         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
 387
 388         snd_soc_dpcm_mutex_lock(fe);
 389         ret = dpcm_be_dai_hw_params(fe, stream);
 390         snd_soc_dpcm_mutex_unlock(fe);
 391         if (ret < 0)
 392                 goto out;
 393
 394         snd_soc_dpcm_mutex_lock(fe);
 395         ret = dpcm_be_dai_prepare(fe, stream);
 396         snd_soc_dpcm_mutex_unlock(fe);
 397         if (ret < 0)
 398                 goto out;
 399
 400         ret = snd_soc_dai_compr_set_params(cpu_dai, cstream, params);
 401         if (ret < 0)
 402                 goto out;
 403
 404         ret = snd_soc_component_compr_set_params(cstream, params);
 405         if (ret < 0)
 406                 goto out;
 407
 408         ret = snd_soc_link_compr_set_params(cstream);
 409         if (ret < 0)
 410                 goto out;
 411         snd_soc_dpcm_mutex_lock(fe);
 412         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
 413         snd_soc_dpcm_mutex_unlock(fe);
 414         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
 415
 416 out:
 417         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
 418         snd_soc_card_mutex_unlock(fe->card);
 419         return ret;
 420 }
 421
 422 static int soc_compr_get_params(struct snd_compr_stream *cstream,
 423                                 struct snd_codec *params)
 424 {
 425         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 426         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 427         int ret = 0;
 428
 429         snd_soc_dpcm_mutex_lock(rtd);
 430
 431         ret = snd_soc_dai_compr_get_params(cpu_dai, cstream, params);
 432         if (ret < 0)
 433                 goto err;
 434
 435         ret = snd_soc_component_compr_get_params(cstream, params);
 436 err:
 437         snd_soc_dpcm_mutex_unlock(rtd);
 438         return ret;
 439 }
 440
 441 static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
 442 {
 443         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 444         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 445         int ret;
 446
 447         snd_soc_dpcm_mutex_lock(rtd);
 448
 449         ret = snd_soc_dai_compr_ack(cpu_dai, cstream, bytes);
 450         if (ret < 0)
 451                 goto err;
 452
 453         ret = snd_soc_component_compr_ack(cstream, bytes);
 454 err:
 455         snd_soc_dpcm_mutex_unlock(rtd);
 456         return ret;
 457 }
 458
 459 static int soc_compr_pointer(struct snd_compr_stream *cstream,
 460                              struct snd_compr_tstamp *tstamp)
 461 {
 462         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 463         int ret;
 464         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 465
 466         snd_soc_dpcm_mutex_lock(rtd);
 467
 468         ret = snd_soc_dai_compr_pointer(cpu_dai, cstream, tstamp);
 469         if (ret < 0)
 470                 goto out;
 471
 472         ret = snd_soc_component_compr_pointer(cstream, tstamp);
 473 out:
 474         snd_soc_dpcm_mutex_unlock(rtd);
 475         return ret;
 476 }
 477
 478 static int soc_compr_set_metadata(struct snd_compr_stream *cstream,
 479                                   struct snd_compr_metadata *metadata)
 480 {
 481         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 482         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 483         int ret;
 484
 485         ret = snd_soc_dai_compr_set_metadata(cpu_dai, cstream, metadata);
 486         if (ret < 0)
 487                 return ret;
 488
 489         return snd_soc_component_compr_set_metadata(cstream, metadata);
 490 }
 491
 492 static int soc_compr_get_metadata(struct snd_compr_stream *cstream,
 493                                   struct snd_compr_metadata *metadata)
 494 {
 495         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 496         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 497         int ret;
 498
 499         ret = snd_soc_dai_compr_get_metadata(cpu_dai, cstream, metadata);
 500         if (ret < 0)
 501                 return ret;
 502
 503         return snd_soc_component_compr_get_metadata(cstream, metadata);
 504 }
 505
 506 /* ASoC Compress operations */
 507 static struct snd_compr_ops soc_compr_ops = {
 508         .open           = soc_compr_open,
 509         .free           = soc_compr_free,
 510         .set_params     = soc_compr_set_params,
 511         .set_metadata   = soc_compr_set_metadata,
 512         .get_metadata   = soc_compr_get_metadata,
 513         .get_params     = soc_compr_get_params,
 514         .trigger        = soc_compr_trigger,
 515         .pointer        = soc_compr_pointer,
 516         .ack            = soc_compr_ack,
 517         .get_caps       = snd_soc_component_compr_get_caps,
 518         .get_codec_caps = snd_soc_component_compr_get_codec_caps,
 519 };
 520
 521 /* ASoC Dynamic Compress operations */
 522 static struct snd_compr_ops soc_compr_dyn_ops = {
 523         .open           = soc_compr_open_fe,
 524         .free           = soc_compr_free_fe,
 525         .set_params     = soc_compr_set_params_fe,
 526         .get_params     = soc_compr_get_params,
 527         .set_metadata   = soc_compr_set_metadata,
 528         .get_metadata   = soc_compr_get_metadata,
 529         .trigger        = soc_compr_trigger_fe,
 530         .pointer        = soc_compr_pointer,
 531         .ack            = soc_compr_ack,
 532         .get_caps       = snd_soc_component_compr_get_caps,
 533         .get_codec_caps = snd_soc_component_compr_get_codec_caps,
 534 };
 535
 536 /**
 537  * snd_soc_new_compress - create a new compress.
 538  *
 539  * @rtd: The runtime for which we will create compress
 540  *
 541  * Return: 0 for success, else error.
 542  */
 543 int snd_soc_new_compress(struct snd_soc_pcm_runtime *rtd)
 544 {
 545         struct snd_soc_component *component;
 546         struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
 547         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 548         struct snd_compr *compr;
 549         struct snd_pcm *be_pcm;
 550         char new_name[64];
 551         int ret = 0, direction = 0;
 552         int playback = 0, capture = 0;
 553         int i;
 554
 555         /*
 556          * make sure these are same value,
 557          * and then use these as equally
 558          */
 559         BUILD_BUG_ON((int)SNDRV_PCM_STREAM_PLAYBACK != (int)SND_COMPRESS_PLAYBACK);
 560         BUILD_BUG_ON((int)SNDRV_PCM_STREAM_CAPTURE  != (int)SND_COMPRESS_CAPTURE);
 561
 562         if (rtd->dai_link->num_cpus > 1 ||
 563             rtd->dai_link->num_codecs > 1) {
 564                 dev_err(rtd->card->dev,
 565                         "Compress ASoC: Multi CPU/Codec not supported\n");
 566                 return -EINVAL;
 567         }
 568
 569         if (!codec_dai) {
 570                 dev_err(rtd->card->dev, "Missing codec\n");
 571                 return -EINVAL;
 572         }
 573
 574         /* check client and interface hw capabilities */
 575         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
 576             snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_PLAYBACK))
 577                 playback = 1;
 578         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
 579             snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_CAPTURE))
 580                 capture = 1;
 581
 582         /*
 583          * Compress devices are unidirectional so only one of the directions
 584          * should be set, check for that (xor)
 585          */
 586         if (playback + capture != 1) {
 587                 dev_err(rtd->card->dev,
 588                         "Compress ASoC: Invalid direction for P %d, C %d\n",
 589                         playback, capture);
 590                 return -EINVAL;
 591         }
 592
 593         if (playback)
 594                 direction = SND_COMPRESS_PLAYBACK;
 595         else
 596                 direction = SND_COMPRESS_CAPTURE;
 597
 598         compr = devm_kzalloc(rtd->card->dev, sizeof(*compr), GFP_KERNEL);
 599         if (!compr)
 600                 return -ENOMEM;
 601
 602         compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
 603                                   GFP_KERNEL);
 604         if (!compr->ops)
 605                 return -ENOMEM;
 606
 607         if (rtd->dai_link->dynamic) {
 608                 int playback = 1;
 609                 int capture  = 1;
 610
 611                 if (rtd->dai_link->capture_only)
 612                         playback = 0;
 613                 if (rtd->dai_link->playback_only)
 614                         capture = 0;
 615
 616                 snprintf(new_name, sizeof(new_name), "(%s)",
 617                         rtd->dai_link->stream_name);
 618
 619                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, rtd->id,
 620                                 playback, capture, &be_pcm);
 621                 if (ret < 0) {
 622                         dev_err(rtd->card->dev,
 623                                 "Compress ASoC: can't create compressed for %s: %d\n",
 624                                 rtd->dai_link->name, ret);
 625                         return ret;
 626                 }
 627
 628                 /* inherit atomicity from DAI link */
 629                 be_pcm->nonatomic = rtd->dai_link->nonatomic;
 630
 631                 rtd->pcm = be_pcm;
 632                 rtd->fe_compr = 1;
 633                 if (playback)
 634                         be_pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
 635                 if (capture)
 636                         be_pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
 637                 memcpy(compr->ops, &soc_compr_dyn_ops, sizeof(soc_compr_dyn_ops));
 638         } else {
 639                 snprintf(new_name, sizeof(new_name), "%s %s-%d",
 640                         rtd->dai_link->stream_name, codec_dai->name, rtd->id);
 641
 642                 memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));
 643         }
 644
 645         for_each_rtd_components(rtd, i, component) {
 646                 if (!component->driver->compress_ops ||
 647                     !component->driver->compress_ops->copy)
 648                         continue;
 649
 650                 compr->ops->copy = snd_soc_component_compr_copy;
 651                 break;
 652         }
 653
 654         ret = snd_compress_new(rtd->card->snd_card, rtd->id, direction,
 655                                 new_name, compr);
 656         if (ret < 0) {
 657                 component = snd_soc_rtd_to_codec(rtd, 0)->component;
 658                 dev_err(component->dev,
 659                         "Compress ASoC: can't create compress for codec %s: %d\n",
 660                         component->name, ret);
 661                 return ret;
 662         }
 663
 664         /* DAPM dai link stream work */
 665         rtd->close_delayed_work_func = snd_soc_close_delayed_work;
 666
 667         rtd->compr = compr;
 668         compr->private_data = rtd;
 669
 670         dev_dbg(rtd->card->dev, "Compress ASoC: %s <-> %s mapping ok\n",
 671                 codec_dai->name, cpu_dai->name);
 672
 673         return 0;
 674 }
 675 EXPORT_SYMBOL_GPL(snd_soc_new_compress);