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                         printk(KERN_ERR "asoc: can't open interface %s\n",
 127                                 cpu_dai->name);
 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                         printk(KERN_ERR "asoc: can't open platform %s\n", platform->name);
 136                         goto platform_err;
 137                 }
 138         }
 139
 140         if (codec_dai->driver->ops->startup) {
 141                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
 142                 if (ret < 0) {
 143                         printk(KERN_ERR "asoc: can't open codec %s\n",
 144                                 codec_dai->name);
 145                         goto codec_dai_err;
 146                 }
 147         }
 148
 149         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 150                 ret = rtd->dai_link->ops->startup(substream);
 151                 if (ret < 0) {
 152                         printk(KERN_ERR "asoc: %s startup failed\n", rtd->dai_link->name);
 153                         goto machine_err;
 154                 }
 155         }
 156
 157         /* Check that the codec and cpu DAIs are compatible */
 158         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 159                 runtime->hw.rate_min =
 160                         max(codec_dai_drv->playback.rate_min,
 161                             cpu_dai_drv->playback.rate_min);
 162                 runtime->hw.rate_max =
 163                         min(codec_dai_drv->playback.rate_max,
 164                             cpu_dai_drv->playback.rate_max);
 165                 runtime->hw.channels_min =
 166                         max(codec_dai_drv->playback.channels_min,
 167                                 cpu_dai_drv->playback.channels_min);
 168                 runtime->hw.channels_max =
 169                         min(codec_dai_drv->playback.channels_max,
 170                                 cpu_dai_drv->playback.channels_max);
 171                 runtime->hw.formats =
 172                         codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
 173                 runtime->hw.rates =
 174                         codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
 175                 if (codec_dai_drv->playback.rates
 176                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 177                         runtime->hw.rates |= cpu_dai_drv->playback.rates;
 178                 if (cpu_dai_drv->playback.rates
 179                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 180                         runtime->hw.rates |= codec_dai_drv->playback.rates;
 181         } else {
 182                 runtime->hw.rate_min =
 183                         max(codec_dai_drv->capture.rate_min,
 184                             cpu_dai_drv->capture.rate_min);
 185                 runtime->hw.rate_max =
 186                         min(codec_dai_drv->capture.rate_max,
 187                             cpu_dai_drv->capture.rate_max);
 188                 runtime->hw.channels_min =
 189                         max(codec_dai_drv->capture.channels_min,
 190                                 cpu_dai_drv->capture.channels_min);
 191                 runtime->hw.channels_max =
 192                         min(codec_dai_drv->capture.channels_max,
 193                                 cpu_dai_drv->capture.channels_max);
 194                 runtime->hw.formats =
 195                         codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
 196                 runtime->hw.rates =
 197                         codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
 198                 if (codec_dai_drv->capture.rates
 199                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 200                         runtime->hw.rates |= cpu_dai_drv->capture.rates;
 201                 if (cpu_dai_drv->capture.rates
 202                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 203                         runtime->hw.rates |= codec_dai_drv->capture.rates;
 204         }
 205
 206         ret = -EINVAL;
 207         snd_pcm_limit_hw_rates(runtime);
 208         if (!runtime->hw.rates) {
 209                 printk(KERN_ERR "asoc: %s <-> %s No matching rates\n",
 210                         codec_dai->name, cpu_dai->name);
 211                 goto config_err;
 212         }
 213         if (!runtime->hw.formats) {
 214                 printk(KERN_ERR "asoc: %s <-> %s No matching formats\n",
 215                         codec_dai->name, cpu_dai->name);
 216                 goto config_err;
 217         }
 218         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 219             runtime->hw.channels_min > runtime->hw.channels_max) {
 220                 printk(KERN_ERR "asoc: %s <-> %s No matching channels\n",
 221                                 codec_dai->name, cpu_dai->name);
 222                 goto config_err;
 223         }
 224
 225         soc_pcm_apply_msb(substream, codec_dai);
 226         soc_pcm_apply_msb(substream, cpu_dai);
 227
 228         /* Symmetry only applies if we've already got an active stream. */
 229         if (cpu_dai->active) {
 230                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 231                 if (ret != 0)
 232                         goto config_err;
 233         }
 234
 235         if (codec_dai->active) {
 236                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
 237                 if (ret != 0)
 238                         goto config_err;
 239         }
 240
 241         pr_debug("asoc: %s <-> %s info:\n",
 242                         codec_dai->name, cpu_dai->name);
 243         pr_debug("asoc: rate mask 0x%x\n", runtime->hw.rates);
 244         pr_debug("asoc: min ch %d max ch %d\n", runtime->hw.channels_min,
 245                  runtime->hw.channels_max);
 246         pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
 247                  runtime->hw.rate_max);
 248
 249         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 250                 cpu_dai->playback_active++;
 251                 codec_dai->playback_active++;
 252         } else {
 253                 cpu_dai->capture_active++;
 254                 codec_dai->capture_active++;
 255         }
 256         cpu_dai->active++;
 257         codec_dai->active++;
 258         rtd->codec->active++;
 259         mutex_unlock(&rtd->pcm_mutex);
 260         return 0;
 261
 262 config_err:
 263         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 264                 rtd->dai_link->ops->shutdown(substream);
 265
 266 machine_err:
 267         if (codec_dai->driver->ops->shutdown)
 268                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 269
 270 codec_dai_err:
 271         if (platform->driver->ops && platform->driver->ops->close)
 272                 platform->driver->ops->close(substream);
 273
 274 platform_err:
 275         if (cpu_dai->driver->ops->shutdown)
 276                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 277 out:
 278         mutex_unlock(&rtd->pcm_mutex);
 279
 280         pm_runtime_put(platform->dev);
 281         pm_runtime_put(codec_dai->dev);
 282         pm_runtime_put(cpu_dai->dev);
 283
 284         return ret;
 285 }
 286
 287 /*
 288  * Power down the audio subsystem pmdown_time msecs after close is called.
 289  * This is to ensure there are no pops or clicks in between any music tracks
 290  * due to DAPM power cycling.
 291  */
 292 static void close_delayed_work(struct work_struct *work)
 293 {
 294         struct snd_soc_pcm_runtime *rtd =
 295                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 296         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 297
 298         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 299
 300         pr_debug("pop wq checking: %s status: %s waiting: %s\n",
 301                  codec_dai->driver->playback.stream_name,
 302                  codec_dai->playback_active ? "active" : "inactive",
 303                  codec_dai->pop_wait ? "yes" : "no");
 304
 305         /* are we waiting on this codec DAI stream */
 306         if (codec_dai->pop_wait == 1) {
 307                 codec_dai->pop_wait = 0;
 308                 snd_soc_dapm_stream_event(rtd,
 309                         codec_dai->driver->playback.stream_name,
 310                         SND_SOC_DAPM_STREAM_STOP);
 311         }
 312
 313         mutex_unlock(&rtd->pcm_mutex);
 314 }
 315
 316 /*
 317  * Called by ALSA when a PCM substream is closed. Private data can be
 318  * freed here. The cpu DAI, codec DAI, machine and platform are also
 319  * shutdown.
 320  */
 321 static int soc_pcm_close(struct snd_pcm_substream *substream)
 322 {
 323         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 324         struct snd_soc_platform *platform = rtd->platform;
 325         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 326         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 327         struct snd_soc_codec *codec = rtd->codec;
 328
 329         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 330
 331         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 332                 cpu_dai->playback_active--;
 333                 codec_dai->playback_active--;
 334         } else {
 335                 cpu_dai->capture_active--;
 336                 codec_dai->capture_active--;
 337         }
 338
 339         cpu_dai->active--;
 340         codec_dai->active--;
 341         codec->active--;
 342
 343         /* clear the corresponding DAIs rate when inactive */
 344         if (!cpu_dai->active)
 345                 cpu_dai->rate = 0;
 346
 347         if (!codec_dai->active)
 348                 codec_dai->rate = 0;
 349
 350         /* Muting the DAC suppresses artifacts caused during digital
 351          * shutdown, for example from stopping clocks.
 352          */
 353         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 354                 snd_soc_dai_digital_mute(codec_dai, 1);
 355
 356         if (cpu_dai->driver->ops->shutdown)
 357                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 358
 359         if (codec_dai->driver->ops->shutdown)
 360                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 361
 362         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 363                 rtd->dai_link->ops->shutdown(substream);
 364
 365         if (platform->driver->ops && platform->driver->ops->close)
 366                 platform->driver->ops->close(substream);
 367         cpu_dai->runtime = NULL;
 368
 369         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 370                 if (codec->ignore_pmdown_time ||
 371                     rtd->dai_link->ignore_pmdown_time) {
 372                         /* powered down playback stream now */
 373                         snd_soc_dapm_stream_event(rtd,
 374                                 codec_dai->driver->playback.stream_name,
 375                                 SND_SOC_DAPM_STREAM_STOP);
 376                 } else {
 377                         /* start delayed pop wq here for playback streams */
 378                         codec_dai->pop_wait = 1;
 379                         schedule_delayed_work(&rtd->delayed_work,
 380                                 msecs_to_jiffies(rtd->pmdown_time));
 381                 }
 382         } else {
 383                 /* capture streams can be powered down now */
 384                 snd_soc_dapm_stream_event(rtd,
 385                         codec_dai->driver->capture.stream_name,
 386                         SND_SOC_DAPM_STREAM_STOP);
 387         }
 388
 389         mutex_unlock(&rtd->pcm_mutex);
 390
 391         pm_runtime_put(platform->dev);
 392         pm_runtime_put(codec_dai->dev);
 393         pm_runtime_put(cpu_dai->dev);
 394
 395         return 0;
 396 }
 397
 398 /*
 399  * Called by ALSA when the PCM substream is prepared, can set format, sample
 400  * rate, etc.  This function is non atomic and can be called multiple times,
 401  * it can refer to the runtime info.
 402  */
 403 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 404 {
 405         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 406         struct snd_soc_platform *platform = rtd->platform;
 407         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 408         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 409         int ret = 0;
 410
 411         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 412
 413         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 414                 ret = rtd->dai_link->ops->prepare(substream);
 415                 if (ret < 0) {
 416                         printk(KERN_ERR "asoc: machine prepare error\n");
 417                         goto out;
 418                 }
 419         }
 420
 421         if (platform->driver->ops && platform->driver->ops->prepare) {
 422                 ret = platform->driver->ops->prepare(substream);
 423                 if (ret < 0) {
 424                         printk(KERN_ERR "asoc: platform prepare error\n");
 425                         goto out;
 426                 }
 427         }
 428
 429         if (codec_dai->driver->ops->prepare) {
 430                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
 431                 if (ret < 0) {
 432                         printk(KERN_ERR "asoc: codec DAI prepare error\n");
 433                         goto out;
 434                 }
 435         }
 436
 437         if (cpu_dai->driver->ops->prepare) {
 438                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 439                 if (ret < 0) {
 440                         printk(KERN_ERR "asoc: cpu DAI prepare error\n");
 441                         goto out;
 442                 }
 443         }
 444
 445         /* cancel any delayed stream shutdown that is pending */
 446         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 447             codec_dai->pop_wait) {
 448                 codec_dai->pop_wait = 0;
 449                 cancel_delayed_work(&rtd->delayed_work);
 450         }
 451
 452         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 453                 snd_soc_dapm_stream_event(rtd,
 454                                           codec_dai->driver->playback.stream_name,
 455                                           SND_SOC_DAPM_STREAM_START);
 456         else
 457                 snd_soc_dapm_stream_event(rtd,
 458                                           codec_dai->driver->capture.stream_name,
 459                                           SND_SOC_DAPM_STREAM_START);
 460
 461         snd_soc_dai_digital_mute(codec_dai, 0);
 462
 463 out:
 464         mutex_unlock(&rtd->pcm_mutex);
 465         return ret;
 466 }
 467
 468 /*
 469  * Called by ALSA when the hardware params are set by application. This
 470  * function can also be called multiple times and can allocate buffers
 471  * (using snd_pcm_lib_* ). It's non-atomic.
 472  */
 473 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 474                                 struct snd_pcm_hw_params *params)
 475 {
 476         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 477         struct snd_soc_platform *platform = rtd->platform;
 478         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 479         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 480         int ret = 0;
 481
 482         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 483
 484         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 485                 ret = rtd->dai_link->ops->hw_params(substream, params);
 486                 if (ret < 0) {
 487                         printk(KERN_ERR "asoc: machine hw_params failed\n");
 488                         goto out;
 489                 }
 490         }
 491
 492         if (codec_dai->driver->ops->hw_params) {
 493                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
 494                 if (ret < 0) {
 495                         printk(KERN_ERR "asoc: can't set codec %s hw params\n",
 496                                 codec_dai->name);
 497                         goto codec_err;
 498                 }
 499         }
 500
 501         if (cpu_dai->driver->ops->hw_params) {
 502                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
 503                 if (ret < 0) {
 504                         printk(KERN_ERR "asoc: interface %s hw params failed\n",
 505                                 cpu_dai->name);
 506                         goto interface_err;
 507                 }
 508         }
 509
 510         if (platform->driver->ops && platform->driver->ops->hw_params) {
 511                 ret = platform->driver->ops->hw_params(substream, params);
 512                 if (ret < 0) {
 513                         printk(KERN_ERR "asoc: platform %s hw params failed\n",
 514                                 platform->name);
 515                         goto platform_err;
 516                 }
 517         }
 518
 519         /* store the rate for each DAIs */
 520         cpu_dai->rate = params_rate(params);
 521         codec_dai->rate = params_rate(params);
 522
 523 out:
 524         mutex_unlock(&rtd->pcm_mutex);
 525         return ret;
 526
 527 platform_err:
 528         if (cpu_dai->driver->ops->hw_free)
 529                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 530
 531 interface_err:
 532         if (codec_dai->driver->ops->hw_free)
 533                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 534
 535 codec_err:
 536         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 537                 rtd->dai_link->ops->hw_free(substream);
 538
 539         mutex_unlock(&rtd->pcm_mutex);
 540         return ret;
 541 }
 542
 543 /*
 544  * Frees resources allocated by hw_params, can be called multiple times
 545  */
 546 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 547 {
 548         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 549         struct snd_soc_platform *platform = rtd->platform;
 550         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 551         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 552         struct snd_soc_codec *codec = rtd->codec;
 553
 554         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 555
 556         /* apply codec digital mute */
 557         if (!codec->active)
 558                 snd_soc_dai_digital_mute(codec_dai, 1);
 559
 560         /* free any machine hw params */
 561         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 562                 rtd->dai_link->ops->hw_free(substream);
 563
 564         /* free any DMA resources */
 565         if (platform->driver->ops && platform->driver->ops->hw_free)
 566                 platform->driver->ops->hw_free(substream);
 567
 568         /* now free hw params for the DAIs  */
 569         if (codec_dai->driver->ops->hw_free)
 570                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 571
 572         if (cpu_dai->driver->ops->hw_free)
 573                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 574
 575         mutex_unlock(&rtd->pcm_mutex);
 576         return 0;
 577 }
 578
 579 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 580 {
 581         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 582         struct snd_soc_platform *platform = rtd->platform;
 583         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 584         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 585         int ret;
 586
 587         if (codec_dai->driver->ops->trigger) {
 588                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
 589                 if (ret < 0)
 590                         return ret;
 591         }
 592
 593         if (platform->driver->ops && platform->driver->ops->trigger) {
 594                 ret = platform->driver->ops->trigger(substream, cmd);
 595                 if (ret < 0)
 596                         return ret;
 597         }
 598
 599         if (cpu_dai->driver->ops->trigger) {
 600                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 601                 if (ret < 0)
 602                         return ret;
 603         }
 604         return 0;
 605 }
 606
 607 /*
 608  * soc level wrapper for pointer callback
 609  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 610  * the runtime->delay will be updated accordingly.
 611  */
 612 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 613 {
 614         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 615         struct snd_soc_platform *platform = rtd->platform;
 616         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 617         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 618         struct snd_pcm_runtime *runtime = substream->runtime;
 619         snd_pcm_uframes_t offset = 0;
 620         snd_pcm_sframes_t delay = 0;
 621
 622         if (platform->driver->ops && platform->driver->ops->pointer)
 623                 offset = platform->driver->ops->pointer(substream);
 624
 625         if (cpu_dai->driver->ops->delay)
 626                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 627
 628         if (codec_dai->driver->ops->delay)
 629                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 630
 631         if (platform->driver->delay)
 632                 delay += platform->driver->delay(substream, codec_dai);
 633
 634         runtime->delay = delay;
 635
 636         return offset;
 637 }
 638
 639 /* create a new pcm */
 640 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 641 {
 642         struct snd_soc_codec *codec = rtd->codec;
 643         struct snd_soc_platform *platform = rtd->platform;
 644         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 645         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 646         struct snd_pcm_ops *soc_pcm_ops = &rtd->ops;
 647         struct snd_pcm *pcm;
 648         char new_name[64];
 649         int ret = 0, playback = 0, capture = 0;
 650
 651         soc_pcm_ops->open       = soc_pcm_open;
 652         soc_pcm_ops->close      = soc_pcm_close;
 653         soc_pcm_ops->hw_params  = soc_pcm_hw_params;
 654         soc_pcm_ops->hw_free    = soc_pcm_hw_free;
 655         soc_pcm_ops->prepare    = soc_pcm_prepare;
 656         soc_pcm_ops->trigger    = soc_pcm_trigger;
 657         soc_pcm_ops->pointer    = soc_pcm_pointer;
 658
 659         /* check client and interface hw capabilities */
 660         snprintf(new_name, sizeof(new_name), "%s %s-%d",
 661                         rtd->dai_link->stream_name, codec_dai->name, num);
 662
 663         if (codec_dai->driver->playback.channels_min)
 664                 playback = 1;
 665         if (codec_dai->driver->capture.channels_min)
 666                 capture = 1;
 667
 668         dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num,new_name);
 669         ret = snd_pcm_new(rtd->card->snd_card, new_name,
 670                         num, playback, capture, &pcm);
 671         if (ret < 0) {
 672                 printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
 673                 return ret;
 674         }
 675
 676         /* DAPM dai link stream work */
 677         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
 678
 679         rtd->pcm = pcm;
 680         pcm->private_data = rtd;
 681         if (platform->driver->ops) {
 682                 soc_pcm_ops->mmap = platform->driver->ops->mmap;
 683                 soc_pcm_ops->pointer = platform->driver->ops->pointer;
 684                 soc_pcm_ops->ioctl = platform->driver->ops->ioctl;
 685                 soc_pcm_ops->copy = platform->driver->ops->copy;
 686                 soc_pcm_ops->silence = platform->driver->ops->silence;
 687                 soc_pcm_ops->ack = platform->driver->ops->ack;
 688                 soc_pcm_ops->page = platform->driver->ops->page;
 689         }
 690
 691         if (playback)
 692                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, soc_pcm_ops);
 693
 694         if (capture)
 695                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, soc_pcm_ops);
 696
 697         if (platform->driver->pcm_new) {
 698                 ret = platform->driver->pcm_new(rtd);
 699                 if (ret < 0) {
 700                         pr_err("asoc: platform pcm constructor failed\n");
 701                         return ret;
 702                 }
 703         }
 704
 705         pcm->private_free = platform->driver->pcm_free;
 706         printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
 707                 cpu_dai->name);
 708         return ret;
 709 }