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