sound/soc/soc-pcm.c

   1 /*
   2  * soc-pcm.c  --  ALSA SoC PCM
   3  *
   4  * Copyright 2005 Wolfson Microelectronics PLC.
   5  * Copyright 2005 Openedhand Ltd.
   6  * Copyright (C) 2010 Slimlogic Ltd.
   7  * Copyright (C) 2010 Texas Instruments Inc.
   8  *
   9  * Authors: Liam Girdwood <lrg@ti.com>
  10  *          Mark Brown <broonie@opensource.wolfsonmicro.com>
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/slab.h>
  24 #include <linux/workqueue.h>
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28 #include <sound/soc.h>
  29 #include <sound/initval.h>
  30
  31 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
  32                                         struct snd_soc_dai *soc_dai)
  33 {
  34         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  35         int ret;
  36
  37         if (!soc_dai->driver->symmetric_rates &&
  38             !rtd->dai_link->symmetric_rates)
  39                 return 0;
  40
  41         /* This can happen if multiple streams are starting simultaneously -
  42          * the second can need to get its constraints before the first has
  43          * picked a rate.  Complain and allow the application to carry on.
  44          */
  45         if (!soc_dai->rate) {
  46                 dev_warn(soc_dai->dev,
  47                          "Not enforcing symmetric_rates due to race\n");
  48                 return 0;
  49         }
  50
  51         dev_dbg(soc_dai->dev, "Symmetry forces %dHz rate\n", soc_dai->rate);
  52
  53         ret = snd_pcm_hw_constraint_minmax(substream->runtime,
  54                                            SNDRV_PCM_HW_PARAM_RATE,
  55                                            soc_dai->rate, soc_dai->rate);
  56         if (ret < 0) {
  57                 dev_err(soc_dai->dev,
  58                         "Unable to apply rate symmetry constraint: %d\n", ret);
  59                 return ret;
  60         }
  61
  62         return 0;
  63 }
  64
  65 /*
  66  * List of sample sizes that might go over the bus for parameter
  67  * application.  There ought to be a wildcard sample size for things
  68  * like the DAC/ADC resolution to use but there isn't right now.
  69  */
  70 static int sample_sizes[] = {
  71         24, 32,
  72 };
  73
  74 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
  75                               struct snd_soc_dai *dai)
  76 {
  77         int ret, i, bits;
  78
  79         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  80                 bits = dai->driver->playback.sig_bits;
  81         else
  82                 bits = dai->driver->capture.sig_bits;
  83
  84         if (!bits)
  85                 return;
  86
  87         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
  88                 if (bits >= sample_sizes[i])
  89                         continue;
  90
  91                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
  92                                                    sample_sizes[i], bits);
  93                 if (ret != 0)
  94                         dev_warn(dai->dev,
  95                                  "Failed to set MSB %d/%d: %d\n",
  96                                  bits, sample_sizes[i], ret);
  97         }
  98 }
  99
 100 /*
 101  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 102  * then initialized and any private data can be allocated. This also calls
 103  * startup for the cpu DAI, platform, machine and codec DAI.
 104  */
 105 static int soc_pcm_open(struct snd_pcm_substream *substream)
 106 {
 107         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 108         struct snd_pcm_runtime *runtime = substream->runtime;
 109         struct snd_soc_platform *platform = rtd->platform;
 110         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 111         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 112         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
 113         struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
 114         int ret = 0;
 115
 116         pm_runtime_get_sync(cpu_dai->dev);
 117         pm_runtime_get_sync(codec_dai->dev);
 118         pm_runtime_get_sync(platform->dev);
 119
 120         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 121
 122         /* startup the audio subsystem */
 123         if (cpu_dai->driver->ops->startup) {
 124                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 125                 if (ret < 0) {
 126                         dev_err(cpu_dai->dev, "can't open interface %s: %d\n",
 127                                 cpu_dai->name, ret);
 128                         goto out;
 129                 }
 130         }
 131
 132         if (platform->driver->ops && platform->driver->ops->open) {
 133                 ret = platform->driver->ops->open(substream);
 134                 if (ret < 0) {
 135                         dev_err(platform->dev, "can't open platform %s: %d\n",
 136                                 platform->name, ret);
 137                         goto platform_err;
 138                 }
 139         }
 140
 141         if (codec_dai->driver->ops->startup) {
 142                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
 143                 if (ret < 0) {
 144                         dev_err(codec_dai->dev, "can't open codec %s: %d\n",
 145                                 codec_dai->name, ret);
 146                         goto codec_dai_err;
 147                 }
 148         }
 149
 150         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 151                 ret = rtd->dai_link->ops->startup(substream);
 152                 if (ret < 0) {
 153                         pr_err("asoc: %s startup failed: %d\n",
 154                                rtd->dai_link->name, ret);
 155                         goto machine_err;
 156                 }
 157         }
 158
 159         /* Check that the codec and cpu DAIs are compatible */
 160         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 161                 runtime->hw.rate_min =
 162                         max(codec_dai_drv->playback.rate_min,
 163                             cpu_dai_drv->playback.rate_min);
 164                 runtime->hw.rate_max =
 165                         min(codec_dai_drv->playback.rate_max,
 166                             cpu_dai_drv->playback.rate_max);
 167                 runtime->hw.channels_min =
 168                         max(codec_dai_drv->playback.channels_min,
 169                                 cpu_dai_drv->playback.channels_min);
 170                 runtime->hw.channels_max =
 171                         min(codec_dai_drv->playback.channels_max,
 172                                 cpu_dai_drv->playback.channels_max);
 173                 runtime->hw.formats =
 174                         codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
 175                 runtime->hw.rates =
 176                         codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
 177                 if (codec_dai_drv->playback.rates
 178                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 179                         runtime->hw.rates |= cpu_dai_drv->playback.rates;
 180                 if (cpu_dai_drv->playback.rates
 181                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 182                         runtime->hw.rates |= codec_dai_drv->playback.rates;
 183         } else {
 184                 runtime->hw.rate_min =
 185                         max(codec_dai_drv->capture.rate_min,
 186                             cpu_dai_drv->capture.rate_min);
 187                 runtime->hw.rate_max =
 188                         min(codec_dai_drv->capture.rate_max,
 189                             cpu_dai_drv->capture.rate_max);
 190                 runtime->hw.channels_min =
 191                         max(codec_dai_drv->capture.channels_min,
 192                                 cpu_dai_drv->capture.channels_min);
 193                 runtime->hw.channels_max =
 194                         min(codec_dai_drv->capture.channels_max,
 195                                 cpu_dai_drv->capture.channels_max);
 196                 runtime->hw.formats =
 197                         codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
 198                 runtime->hw.rates =
 199                         codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
 200                 if (codec_dai_drv->capture.rates
 201                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 202                         runtime->hw.rates |= cpu_dai_drv->capture.rates;
 203                 if (cpu_dai_drv->capture.rates
 204                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 205                         runtime->hw.rates |= codec_dai_drv->capture.rates;
 206         }
 207
 208         ret = -EINVAL;
 209         snd_pcm_limit_hw_rates(runtime);
 210         if (!runtime->hw.rates) {
 211                 printk(KERN_ERR "asoc: %s <-> %s No matching rates\n",
 212                         codec_dai->name, cpu_dai->name);
 213                 goto config_err;
 214         }
 215         if (!runtime->hw.formats) {
 216                 printk(KERN_ERR "asoc: %s <-> %s No matching formats\n",
 217                         codec_dai->name, cpu_dai->name);
 218                 goto config_err;
 219         }
 220         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 221             runtime->hw.channels_min > runtime->hw.channels_max) {
 222                 printk(KERN_ERR "asoc: %s <-> %s No matching channels\n",
 223                                 codec_dai->name, cpu_dai->name);
 224                 goto config_err;
 225         }
 226
 227         soc_pcm_apply_msb(substream, codec_dai);
 228         soc_pcm_apply_msb(substream, cpu_dai);
 229
 230         /* Symmetry only applies if we've already got an active stream. */
 231         if (cpu_dai->active) {
 232                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 233                 if (ret != 0)
 234                         goto config_err;
 235         }
 236
 237         if (codec_dai->active) {
 238                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
 239                 if (ret != 0)
 240                         goto config_err;
 241         }
 242
 243         pr_debug("asoc: %s <-> %s info:\n",
 244                         codec_dai->name, cpu_dai->name);
 245         pr_debug("asoc: rate mask 0x%x\n", runtime->hw.rates);
 246         pr_debug("asoc: min ch %d max ch %d\n", runtime->hw.channels_min,
 247                  runtime->hw.channels_max);
 248         pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
 249                  runtime->hw.rate_max);
 250
 251         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 252                 cpu_dai->playback_active++;
 253                 codec_dai->playback_active++;
 254         } else {
 255                 cpu_dai->capture_active++;
 256                 codec_dai->capture_active++;
 257         }
 258         cpu_dai->active++;
 259         codec_dai->active++;
 260         rtd->codec->active++;
 261         mutex_unlock(&rtd->pcm_mutex);
 262         return 0;
 263
 264 config_err:
 265         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 266                 rtd->dai_link->ops->shutdown(substream);
 267
 268 machine_err:
 269         if (codec_dai->driver->ops->shutdown)
 270                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 271
 272 codec_dai_err:
 273         if (platform->driver->ops && platform->driver->ops->close)
 274                 platform->driver->ops->close(substream);
 275
 276 platform_err:
 277         if (cpu_dai->driver->ops->shutdown)
 278                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 279 out:
 280         mutex_unlock(&rtd->pcm_mutex);
 281
 282         pm_runtime_put(platform->dev);
 283         pm_runtime_put(codec_dai->dev);
 284         pm_runtime_put(cpu_dai->dev);
 285
 286         return ret;
 287 }
 288
 289 /*
 290  * Power down the audio subsystem pmdown_time msecs after close is called.
 291  * This is to ensure there are no pops or clicks in between any music tracks
 292  * due to DAPM power cycling.
 293  */
 294 static void close_delayed_work(struct work_struct *work)
 295 {
 296         struct snd_soc_pcm_runtime *rtd =
 297                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 298         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 299
 300         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 301
 302         pr_debug("pop wq checking: %s status: %s waiting: %s\n",
 303                  codec_dai->driver->playback.stream_name,
 304                  codec_dai->playback_active ? "active" : "inactive",
 305                  codec_dai->pop_wait ? "yes" : "no");
 306
 307         /* are we waiting on this codec DAI stream */
 308         if (codec_dai->pop_wait == 1) {
 309                 codec_dai->pop_wait = 0;
 310                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 311                                           codec_dai, SND_SOC_DAPM_STREAM_STOP);
 312         }
 313
 314         mutex_unlock(&rtd->pcm_mutex);
 315 }
 316
 317 /*
 318  * Called by ALSA when a PCM substream is closed. Private data can be
 319  * freed here. The cpu DAI, codec DAI, machine and platform are also
 320  * shutdown.
 321  */
 322 static int soc_pcm_close(struct snd_pcm_substream *substream)
 323 {
 324         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 325         struct snd_soc_platform *platform = rtd->platform;
 326         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 327         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 328         struct snd_soc_codec *codec = rtd->codec;
 329
 330         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 331
 332         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 333                 cpu_dai->playback_active--;
 334                 codec_dai->playback_active--;
 335         } else {
 336                 cpu_dai->capture_active--;
 337                 codec_dai->capture_active--;
 338         }
 339
 340         cpu_dai->active--;
 341         codec_dai->active--;
 342         codec->active--;
 343
 344         /* clear the corresponding DAIs rate when inactive */
 345         if (!cpu_dai->active)
 346                 cpu_dai->rate = 0;
 347
 348         if (!codec_dai->active)
 349                 codec_dai->rate = 0;
 350
 351         /* Muting the DAC suppresses artifacts caused during digital
 352          * shutdown, for example from stopping clocks.
 353          */
 354         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 355                 snd_soc_dai_digital_mute(codec_dai, 1);
 356
 357         if (cpu_dai->driver->ops->shutdown)
 358                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 359
 360         if (codec_dai->driver->ops->shutdown)
 361                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 362
 363         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 364                 rtd->dai_link->ops->shutdown(substream);
 365
 366         if (platform->driver->ops && platform->driver->ops->close)
 367                 platform->driver->ops->close(substream);
 368         cpu_dai->runtime = NULL;
 369
 370         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 371                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 372                     rtd->dai_link->ignore_pmdown_time) {
 373                         /* powered down playback stream now */
 374                         snd_soc_dapm_stream_event(rtd,
 375                                                   SNDRV_PCM_STREAM_PLAYBACK,
 376                                                   codec_dai,
 377                                                   SND_SOC_DAPM_STREAM_STOP);
 378                 } else {
 379                         /* start delayed pop wq here for playback streams */
 380                         codec_dai->pop_wait = 1;
 381                         schedule_delayed_work(&rtd->delayed_work,
 382                                 msecs_to_jiffies(rtd->pmdown_time));
 383                 }
 384         } else {
 385                 /* capture streams can be powered down now */
 386                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 387                                           codec_dai, SND_SOC_DAPM_STREAM_STOP);
 388         }
 389
 390         mutex_unlock(&rtd->pcm_mutex);
 391
 392         pm_runtime_put(platform->dev);
 393         pm_runtime_put(codec_dai->dev);
 394         pm_runtime_put(cpu_dai->dev);
 395
 396         return 0;
 397 }
 398
 399 /*
 400  * Called by ALSA when the PCM substream is prepared, can set format, sample
 401  * rate, etc.  This function is non atomic and can be called multiple times,
 402  * it can refer to the runtime info.
 403  */
 404 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 405 {
 406         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 407         struct snd_soc_platform *platform = rtd->platform;
 408         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 409         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 410         int ret = 0;
 411
 412         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 413
 414         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 415                 ret = rtd->dai_link->ops->prepare(substream);
 416                 if (ret < 0) {
 417                         pr_err("asoc: machine prepare error: %d\n", ret);
 418                         goto out;
 419                 }
 420         }
 421
 422         if (platform->driver->ops && platform->driver->ops->prepare) {
 423                 ret = platform->driver->ops->prepare(substream);
 424                 if (ret < 0) {
 425                         dev_err(platform->dev, "platform prepare error: %d\n",
 426                                 ret);
 427                         goto out;
 428                 }
 429         }
 430
 431         if (codec_dai->driver->ops->prepare) {
 432                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
 433                 if (ret < 0) {
 434                         dev_err(codec_dai->dev, "DAI prepare error: %d\n",
 435                                 ret);
 436                         goto out;
 437                 }
 438         }
 439
 440         if (cpu_dai->driver->ops->prepare) {
 441                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 442                 if (ret < 0) {
 443                         dev_err(cpu_dai->dev, "DAI prepare error: %d\n",
 444                                 ret);
 445                         goto out;
 446                 }
 447         }
 448
 449         /* cancel any delayed stream shutdown that is pending */
 450         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 451             codec_dai->pop_wait) {
 452                 codec_dai->pop_wait = 0;
 453                 cancel_delayed_work(&rtd->delayed_work);
 454         }
 455
 456         snd_soc_dapm_stream_event(rtd, substream->stream, codec_dai,
 457                                   SND_SOC_DAPM_STREAM_START);
 458
 459         snd_soc_dai_digital_mute(codec_dai, 0);
 460
 461 out:
 462         mutex_unlock(&rtd->pcm_mutex);
 463         return ret;
 464 }
 465
 466 /*
 467  * Called by ALSA when the hardware params are set by application. This
 468  * function can also be called multiple times and can allocate buffers
 469  * (using snd_pcm_lib_* ). It's non-atomic.
 470  */
 471 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 472                                 struct snd_pcm_hw_params *params)
 473 {
 474         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 475         struct snd_soc_platform *platform = rtd->platform;
 476         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 477         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 478         int ret = 0;
 479
 480         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 481
 482         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 483                 ret = rtd->dai_link->ops->hw_params(substream, params);
 484                 if (ret < 0) {
 485                         pr_err("asoc: machine hw_params failed: %d\n", ret);
 486                         goto out;
 487                 }
 488         }
 489
 490         if (codec_dai->driver->ops->hw_params) {
 491                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
 492                 if (ret < 0) {
 493                         dev_err(codec_dai->dev, "can't set %s hw params: %d\n",
 494                                 codec_dai->name, ret);
 495                         goto codec_err;
 496                 }
 497         }
 498
 499         if (cpu_dai->driver->ops->hw_params) {
 500                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
 501                 if (ret < 0) {
 502                         dev_err(cpu_dai->dev, "%s hw params failed: %d\n",
 503                                 cpu_dai->name, ret);
 504                         goto interface_err;
 505                 }
 506         }
 507
 508         if (platform->driver->ops && platform->driver->ops->hw_params) {
 509                 ret = platform->driver->ops->hw_params(substream, params);
 510                 if (ret < 0) {
 511                         dev_err(platform->dev, "%s hw params failed: %d\n",
 512                                platform->name, ret);
 513                         goto platform_err;
 514                 }
 515         }
 516
 517         /* store the rate for each DAIs */
 518         cpu_dai->rate = params_rate(params);
 519         codec_dai->rate = params_rate(params);
 520
 521 out:
 522         mutex_unlock(&rtd->pcm_mutex);
 523         return ret;
 524
 525 platform_err:
 526         if (cpu_dai->driver->ops->hw_free)
 527                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 528
 529 interface_err:
 530         if (codec_dai->driver->ops->hw_free)
 531                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 532
 533 codec_err:
 534         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 535                 rtd->dai_link->ops->hw_free(substream);
 536
 537         mutex_unlock(&rtd->pcm_mutex);
 538         return ret;
 539 }
 540
 541 /*
 542  * Frees resources allocated by hw_params, can be called multiple times
 543  */
 544 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 545 {
 546         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 547         struct snd_soc_platform *platform = rtd->platform;
 548         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 549         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 550         struct snd_soc_codec *codec = rtd->codec;
 551
 552         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 553
 554         /* apply codec digital mute */
 555         if (!codec->active)
 556                 snd_soc_dai_digital_mute(codec_dai, 1);
 557
 558         /* free any machine hw params */
 559         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 560                 rtd->dai_link->ops->hw_free(substream);
 561
 562         /* free any DMA resources */
 563         if (platform->driver->ops && platform->driver->ops->hw_free)
 564                 platform->driver->ops->hw_free(substream);
 565
 566         /* now free hw params for the DAIs  */
 567         if (codec_dai->driver->ops->hw_free)
 568                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 569
 570         if (cpu_dai->driver->ops->hw_free)
 571                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 572
 573         mutex_unlock(&rtd->pcm_mutex);
 574         return 0;
 575 }
 576
 577 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 578 {
 579         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 580         struct snd_soc_platform *platform = rtd->platform;
 581         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 582         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 583         int ret;
 584
 585         if (codec_dai->driver->ops->trigger) {
 586                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
 587                 if (ret < 0)
 588                         return ret;
 589         }
 590
 591         if (platform->driver->ops && platform->driver->ops->trigger) {
 592                 ret = platform->driver->ops->trigger(substream, cmd);
 593                 if (ret < 0)
 594                         return ret;
 595         }
 596
 597         if (cpu_dai->driver->ops->trigger) {
 598                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 599                 if (ret < 0)
 600                         return ret;
 601         }
 602         return 0;
 603 }
 604
 605 /*
 606  * soc level wrapper for pointer callback
 607  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 608  * the runtime->delay will be updated accordingly.
 609  */
 610 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 611 {
 612         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 613         struct snd_soc_platform *platform = rtd->platform;
 614         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 615         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 616         struct snd_pcm_runtime *runtime = substream->runtime;
 617         snd_pcm_uframes_t offset = 0;
 618         snd_pcm_sframes_t delay = 0;
 619
 620         if (platform->driver->ops && platform->driver->ops->pointer)
 621                 offset = platform->driver->ops->pointer(substream);
 622
 623         if (cpu_dai->driver->ops->delay)
 624                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 625
 626         if (codec_dai->driver->ops->delay)
 627                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 628
 629         if (platform->driver->delay)
 630                 delay += platform->driver->delay(substream, codec_dai);
 631
 632         runtime->delay = delay;
 633
 634         return offset;
 635 }
 636
 637 /* create a new pcm */
 638 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 639 {
 640         struct snd_soc_codec *codec = rtd->codec;
 641         struct snd_soc_platform *platform = rtd->platform;
 642         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 643         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 644         struct snd_pcm_ops *soc_pcm_ops = &rtd->ops;
 645         struct snd_pcm *pcm;
 646         char new_name[64];
 647         int ret = 0, playback = 0, capture = 0;
 648
 649         soc_pcm_ops->open       = soc_pcm_open;
 650         soc_pcm_ops->close      = soc_pcm_close;
 651         soc_pcm_ops->hw_params  = soc_pcm_hw_params;
 652         soc_pcm_ops->hw_free    = soc_pcm_hw_free;
 653         soc_pcm_ops->prepare    = soc_pcm_prepare;
 654         soc_pcm_ops->trigger    = soc_pcm_trigger;
 655         soc_pcm_ops->pointer    = soc_pcm_pointer;
 656
 657         /* check client and interface hw capabilities */
 658         snprintf(new_name, sizeof(new_name), "%s %s-%d",
 659                         rtd->dai_link->stream_name, codec_dai->name, num);
 660
 661         if (codec_dai->driver->playback.channels_min)
 662                 playback = 1;
 663         if (codec_dai->driver->capture.channels_min)
 664                 capture = 1;
 665
 666         dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num,new_name);
 667         ret = snd_pcm_new(rtd->card->snd_card, new_name,
 668                         num, playback, capture, &pcm);
 669         if (ret < 0) {
 670                 printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
 671                 return ret;
 672         }
 673
 674         /* DAPM dai link stream work */
 675         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
 676
 677         rtd->pcm = pcm;
 678         pcm->private_data = rtd;
 679         if (platform->driver->ops) {
 680                 soc_pcm_ops->mmap = platform->driver->ops->mmap;
 681                 soc_pcm_ops->pointer = platform->driver->ops->pointer;
 682                 soc_pcm_ops->ioctl = platform->driver->ops->ioctl;
 683                 soc_pcm_ops->copy = platform->driver->ops->copy;
 684                 soc_pcm_ops->silence = platform->driver->ops->silence;
 685                 soc_pcm_ops->ack = platform->driver->ops->ack;
 686                 soc_pcm_ops->page = platform->driver->ops->page;
 687         }
 688
 689         if (playback)
 690                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, soc_pcm_ops);
 691
 692         if (capture)
 693                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, soc_pcm_ops);
 694
 695         if (platform->driver->pcm_new) {
 696                 ret = platform->driver->pcm_new(rtd);
 697                 if (ret < 0) {
 698                         pr_err("asoc: platform pcm constructor failed\n");
 699                         return ret;
 700                 }
 701         }
 702
 703         pcm->private_free = platform->driver->pcm_free;
 704         printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
 705                 cpu_dai->name);
 706         return ret;
 707 }