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 <linux/export.h>
  26 #include <linux/debugfs.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31 #include <sound/soc-dpcm.h>
  32 #include <sound/initval.h>
  33
  34 #define DPCM_MAX_BE_USERS       8
  35
  36 /* DPCM stream event, send event to FE and all active BEs. */
  37 static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
  38         int event)
  39 {
  40         struct snd_soc_dpcm *dpcm;
  41
  42         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
  43
  44                 struct snd_soc_pcm_runtime *be = dpcm->be;
  45
  46                 dev_dbg(be->dev, "pm: BE %s event %d dir %d\n",
  47                                 be->dai_link->name, event, dir);
  48
  49                 snd_soc_dapm_stream_event(be, dir, event);
  50         }
  51
  52         snd_soc_dapm_stream_event(fe, dir, event);
  53
  54         return 0;
  55 }
  56
  57 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
  58                                         struct snd_soc_dai *soc_dai)
  59 {
  60         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  61         int ret;
  62
  63         if (!soc_dai->driver->symmetric_rates &&
  64             !rtd->dai_link->symmetric_rates)
  65                 return 0;
  66
  67         /* This can happen if multiple streams are starting simultaneously -
  68          * the second can need to get its constraints before the first has
  69          * picked a rate.  Complain and allow the application to carry on.
  70          */
  71         if (!soc_dai->rate) {
  72                 dev_warn(soc_dai->dev,
  73                          "Not enforcing symmetric_rates due to race\n");
  74                 return 0;
  75         }
  76
  77         dev_dbg(soc_dai->dev, "Symmetry forces %dHz rate\n", soc_dai->rate);
  78
  79         ret = snd_pcm_hw_constraint_minmax(substream->runtime,
  80                                            SNDRV_PCM_HW_PARAM_RATE,
  81                                            soc_dai->rate, soc_dai->rate);
  82         if (ret < 0) {
  83                 dev_err(soc_dai->dev,
  84                         "Unable to apply rate symmetry constraint: %d\n", ret);
  85                 return ret;
  86         }
  87
  88         return 0;
  89 }
  90
  91 /*
  92  * List of sample sizes that might go over the bus for parameter
  93  * application.  There ought to be a wildcard sample size for things
  94  * like the DAC/ADC resolution to use but there isn't right now.
  95  */
  96 static int sample_sizes[] = {
  97         24, 32,
  98 };
  99
 100 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
 101                               struct snd_soc_dai *dai)
 102 {
 103         int ret, i, bits;
 104
 105         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 106                 bits = dai->driver->playback.sig_bits;
 107         else
 108                 bits = dai->driver->capture.sig_bits;
 109
 110         if (!bits)
 111                 return;
 112
 113         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
 114                 if (bits >= sample_sizes[i])
 115                         continue;
 116
 117                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
 118                                                    sample_sizes[i], bits);
 119                 if (ret != 0)
 120                         dev_warn(dai->dev,
 121                                  "Failed to set MSB %d/%d: %d\n",
 122                                  bits, sample_sizes[i], ret);
 123         }
 124 }
 125
 126 /*
 127  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 128  * then initialized and any private data can be allocated. This also calls
 129  * startup for the cpu DAI, platform, machine and codec DAI.
 130  */
 131 static int soc_pcm_open(struct snd_pcm_substream *substream)
 132 {
 133         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 134         struct snd_pcm_runtime *runtime = substream->runtime;
 135         struct snd_soc_platform *platform = rtd->platform;
 136         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 137         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 138         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
 139         struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
 140         int ret = 0;
 141
 142         pm_runtime_get_sync(cpu_dai->dev);
 143         pm_runtime_get_sync(codec_dai->dev);
 144         pm_runtime_get_sync(platform->dev);
 145
 146         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 147
 148         /* startup the audio subsystem */
 149         if (cpu_dai->driver->ops->startup) {
 150                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 151                 if (ret < 0) {
 152                         dev_err(cpu_dai->dev, "can't open interface %s: %d\n",
 153                                 cpu_dai->name, ret);
 154                         goto out;
 155                 }
 156         }
 157
 158         if (platform->driver->ops && platform->driver->ops->open) {
 159                 ret = platform->driver->ops->open(substream);
 160                 if (ret < 0) {
 161                         dev_err(platform->dev, "can't open platform %s: %d\n",
 162                                 platform->name, ret);
 163                         goto platform_err;
 164                 }
 165         }
 166
 167         if (codec_dai->driver->ops->startup) {
 168                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
 169                 if (ret < 0) {
 170                         dev_err(codec_dai->dev, "can't open codec %s: %d\n",
 171                                 codec_dai->name, ret);
 172                         goto codec_dai_err;
 173                 }
 174         }
 175
 176         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 177                 ret = rtd->dai_link->ops->startup(substream);
 178                 if (ret < 0) {
 179                         pr_err("asoc: %s startup failed: %d\n",
 180                                rtd->dai_link->name, ret);
 181                         goto machine_err;
 182                 }
 183         }
 184
 185         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 186         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 187                 goto dynamic;
 188
 189         /* Check that the codec and cpu DAIs are compatible */
 190         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 191                 runtime->hw.rate_min =
 192                         max(codec_dai_drv->playback.rate_min,
 193                             cpu_dai_drv->playback.rate_min);
 194                 runtime->hw.rate_max =
 195                         min(codec_dai_drv->playback.rate_max,
 196                             cpu_dai_drv->playback.rate_max);
 197                 runtime->hw.channels_min =
 198                         max(codec_dai_drv->playback.channels_min,
 199                                 cpu_dai_drv->playback.channels_min);
 200                 runtime->hw.channels_max =
 201                         min(codec_dai_drv->playback.channels_max,
 202                                 cpu_dai_drv->playback.channels_max);
 203                 runtime->hw.formats =
 204                         codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
 205                 runtime->hw.rates =
 206                         codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
 207                 if (codec_dai_drv->playback.rates
 208                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 209                         runtime->hw.rates |= cpu_dai_drv->playback.rates;
 210                 if (cpu_dai_drv->playback.rates
 211                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 212                         runtime->hw.rates |= codec_dai_drv->playback.rates;
 213         } else {
 214                 runtime->hw.rate_min =
 215                         max(codec_dai_drv->capture.rate_min,
 216                             cpu_dai_drv->capture.rate_min);
 217                 runtime->hw.rate_max =
 218                         min(codec_dai_drv->capture.rate_max,
 219                             cpu_dai_drv->capture.rate_max);
 220                 runtime->hw.channels_min =
 221                         max(codec_dai_drv->capture.channels_min,
 222                                 cpu_dai_drv->capture.channels_min);
 223                 runtime->hw.channels_max =
 224                         min(codec_dai_drv->capture.channels_max,
 225                                 cpu_dai_drv->capture.channels_max);
 226                 runtime->hw.formats =
 227                         codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
 228                 runtime->hw.rates =
 229                         codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
 230                 if (codec_dai_drv->capture.rates
 231                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 232                         runtime->hw.rates |= cpu_dai_drv->capture.rates;
 233                 if (cpu_dai_drv->capture.rates
 234                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 235                         runtime->hw.rates |= codec_dai_drv->capture.rates;
 236         }
 237
 238         ret = -EINVAL;
 239         snd_pcm_limit_hw_rates(runtime);
 240         if (!runtime->hw.rates) {
 241                 printk(KERN_ERR "asoc: %s <-> %s No matching rates\n",
 242                         codec_dai->name, cpu_dai->name);
 243                 goto config_err;
 244         }
 245         if (!runtime->hw.formats) {
 246                 printk(KERN_ERR "asoc: %s <-> %s No matching formats\n",
 247                         codec_dai->name, cpu_dai->name);
 248                 goto config_err;
 249         }
 250         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 251             runtime->hw.channels_min > runtime->hw.channels_max) {
 252                 printk(KERN_ERR "asoc: %s <-> %s No matching channels\n",
 253                                 codec_dai->name, cpu_dai->name);
 254                 goto config_err;
 255         }
 256
 257         soc_pcm_apply_msb(substream, codec_dai);
 258         soc_pcm_apply_msb(substream, cpu_dai);
 259
 260         /* Symmetry only applies if we've already got an active stream. */
 261         if (cpu_dai->active) {
 262                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 263                 if (ret != 0)
 264                         goto config_err;
 265         }
 266
 267         if (codec_dai->active) {
 268                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
 269                 if (ret != 0)
 270                         goto config_err;
 271         }
 272
 273         pr_debug("asoc: %s <-> %s info:\n",
 274                         codec_dai->name, cpu_dai->name);
 275         pr_debug("asoc: rate mask 0x%x\n", runtime->hw.rates);
 276         pr_debug("asoc: min ch %d max ch %d\n", runtime->hw.channels_min,
 277                  runtime->hw.channels_max);
 278         pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
 279                  runtime->hw.rate_max);
 280
 281 dynamic:
 282         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 283                 cpu_dai->playback_active++;
 284                 codec_dai->playback_active++;
 285         } else {
 286                 cpu_dai->capture_active++;
 287                 codec_dai->capture_active++;
 288         }
 289         cpu_dai->active++;
 290         codec_dai->active++;
 291         rtd->codec->active++;
 292         mutex_unlock(&rtd->pcm_mutex);
 293         return 0;
 294
 295 config_err:
 296         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 297                 rtd->dai_link->ops->shutdown(substream);
 298
 299 machine_err:
 300         if (codec_dai->driver->ops->shutdown)
 301                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 302
 303 codec_dai_err:
 304         if (platform->driver->ops && platform->driver->ops->close)
 305                 platform->driver->ops->close(substream);
 306
 307 platform_err:
 308         if (cpu_dai->driver->ops->shutdown)
 309                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 310 out:
 311         mutex_unlock(&rtd->pcm_mutex);
 312
 313         pm_runtime_put(platform->dev);
 314         pm_runtime_put(codec_dai->dev);
 315         pm_runtime_put(cpu_dai->dev);
 316
 317         return ret;
 318 }
 319
 320 /*
 321  * Power down the audio subsystem pmdown_time msecs after close is called.
 322  * This is to ensure there are no pops or clicks in between any music tracks
 323  * due to DAPM power cycling.
 324  */
 325 static void close_delayed_work(struct work_struct *work)
 326 {
 327         struct snd_soc_pcm_runtime *rtd =
 328                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 329         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 330
 331         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 332
 333         pr_debug("pop wq checking: %s status: %s waiting: %s\n",
 334                  codec_dai->driver->playback.stream_name,
 335                  codec_dai->playback_active ? "active" : "inactive",
 336                  codec_dai->pop_wait ? "yes" : "no");
 337
 338         /* are we waiting on this codec DAI stream */
 339         if (codec_dai->pop_wait == 1) {
 340                 codec_dai->pop_wait = 0;
 341                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 342                                           SND_SOC_DAPM_STREAM_STOP);
 343         }
 344
 345         mutex_unlock(&rtd->pcm_mutex);
 346 }
 347
 348 /*
 349  * Called by ALSA when a PCM substream is closed. Private data can be
 350  * freed here. The cpu DAI, codec DAI, machine and platform are also
 351  * shutdown.
 352  */
 353 static int soc_pcm_close(struct snd_pcm_substream *substream)
 354 {
 355         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 356         struct snd_soc_platform *platform = rtd->platform;
 357         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 358         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 359         struct snd_soc_codec *codec = rtd->codec;
 360
 361         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 362
 363         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 364                 cpu_dai->playback_active--;
 365                 codec_dai->playback_active--;
 366         } else {
 367                 cpu_dai->capture_active--;
 368                 codec_dai->capture_active--;
 369         }
 370
 371         cpu_dai->active--;
 372         codec_dai->active--;
 373         codec->active--;
 374
 375         /* clear the corresponding DAIs rate when inactive */
 376         if (!cpu_dai->active)
 377                 cpu_dai->rate = 0;
 378
 379         if (!codec_dai->active)
 380                 codec_dai->rate = 0;
 381
 382         /* Muting the DAC suppresses artifacts caused during digital
 383          * shutdown, for example from stopping clocks.
 384          */
 385         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 386                 snd_soc_dai_digital_mute(codec_dai, 1);
 387
 388         if (cpu_dai->driver->ops->shutdown)
 389                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 390
 391         if (codec_dai->driver->ops->shutdown)
 392                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 393
 394         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 395                 rtd->dai_link->ops->shutdown(substream);
 396
 397         if (platform->driver->ops && platform->driver->ops->close)
 398                 platform->driver->ops->close(substream);
 399         cpu_dai->runtime = NULL;
 400
 401         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 402                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 403                     rtd->dai_link->ignore_pmdown_time) {
 404                         /* powered down playback stream now */
 405                         snd_soc_dapm_stream_event(rtd,
 406                                                   SNDRV_PCM_STREAM_PLAYBACK,
 407                                                   SND_SOC_DAPM_STREAM_STOP);
 408                 } else {
 409                         /* start delayed pop wq here for playback streams */
 410                         codec_dai->pop_wait = 1;
 411                         schedule_delayed_work(&rtd->delayed_work,
 412                                 msecs_to_jiffies(rtd->pmdown_time));
 413                 }
 414         } else {
 415                 /* capture streams can be powered down now */
 416                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 417                                           SND_SOC_DAPM_STREAM_STOP);
 418         }
 419
 420         mutex_unlock(&rtd->pcm_mutex);
 421
 422         pm_runtime_put(platform->dev);
 423         pm_runtime_put(codec_dai->dev);
 424         pm_runtime_put(cpu_dai->dev);
 425
 426         return 0;
 427 }
 428
 429 /*
 430  * Called by ALSA when the PCM substream is prepared, can set format, sample
 431  * rate, etc.  This function is non atomic and can be called multiple times,
 432  * it can refer to the runtime info.
 433  */
 434 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 435 {
 436         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 437         struct snd_soc_platform *platform = rtd->platform;
 438         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 439         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 440         int ret = 0;
 441
 442         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 443
 444         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 445                 ret = rtd->dai_link->ops->prepare(substream);
 446                 if (ret < 0) {
 447                         pr_err("asoc: machine prepare error: %d\n", ret);
 448                         goto out;
 449                 }
 450         }
 451
 452         if (platform->driver->ops && platform->driver->ops->prepare) {
 453                 ret = platform->driver->ops->prepare(substream);
 454                 if (ret < 0) {
 455                         dev_err(platform->dev, "platform prepare error: %d\n",
 456                                 ret);
 457                         goto out;
 458                 }
 459         }
 460
 461         if (codec_dai->driver->ops->prepare) {
 462                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
 463                 if (ret < 0) {
 464                         dev_err(codec_dai->dev, "DAI prepare error: %d\n",
 465                                 ret);
 466                         goto out;
 467                 }
 468         }
 469
 470         if (cpu_dai->driver->ops->prepare) {
 471                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 472                 if (ret < 0) {
 473                         dev_err(cpu_dai->dev, "DAI prepare error: %d\n",
 474                                 ret);
 475                         goto out;
 476                 }
 477         }
 478
 479         /* cancel any delayed stream shutdown that is pending */
 480         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 481             codec_dai->pop_wait) {
 482                 codec_dai->pop_wait = 0;
 483                 cancel_delayed_work(&rtd->delayed_work);
 484         }
 485
 486         snd_soc_dapm_stream_event(rtd, substream->stream,
 487                         SND_SOC_DAPM_STREAM_START);
 488
 489         snd_soc_dai_digital_mute(codec_dai, 0);
 490
 491 out:
 492         mutex_unlock(&rtd->pcm_mutex);
 493         return ret;
 494 }
 495
 496 /*
 497  * Called by ALSA when the hardware params are set by application. This
 498  * function can also be called multiple times and can allocate buffers
 499  * (using snd_pcm_lib_* ). It's non-atomic.
 500  */
 501 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 502                                 struct snd_pcm_hw_params *params)
 503 {
 504         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 505         struct snd_soc_platform *platform = rtd->platform;
 506         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 507         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 508         int ret = 0;
 509
 510         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 511
 512         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 513                 ret = rtd->dai_link->ops->hw_params(substream, params);
 514                 if (ret < 0) {
 515                         pr_err("asoc: machine hw_params failed: %d\n", ret);
 516                         goto out;
 517                 }
 518         }
 519
 520         if (codec_dai->driver->ops->hw_params) {
 521                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
 522                 if (ret < 0) {
 523                         dev_err(codec_dai->dev, "can't set %s hw params: %d\n",
 524                                 codec_dai->name, ret);
 525                         goto codec_err;
 526                 }
 527         }
 528
 529         if (cpu_dai->driver->ops->hw_params) {
 530                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
 531                 if (ret < 0) {
 532                         dev_err(cpu_dai->dev, "%s hw params failed: %d\n",
 533                                 cpu_dai->name, ret);
 534                         goto interface_err;
 535                 }
 536         }
 537
 538         if (platform->driver->ops && platform->driver->ops->hw_params) {
 539                 ret = platform->driver->ops->hw_params(substream, params);
 540                 if (ret < 0) {
 541                         dev_err(platform->dev, "%s hw params failed: %d\n",
 542                                platform->name, ret);
 543                         goto platform_err;
 544                 }
 545         }
 546
 547         /* store the rate for each DAIs */
 548         cpu_dai->rate = params_rate(params);
 549         codec_dai->rate = params_rate(params);
 550
 551 out:
 552         mutex_unlock(&rtd->pcm_mutex);
 553         return ret;
 554
 555 platform_err:
 556         if (cpu_dai->driver->ops->hw_free)
 557                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 558
 559 interface_err:
 560         if (codec_dai->driver->ops->hw_free)
 561                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 562
 563 codec_err:
 564         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 565                 rtd->dai_link->ops->hw_free(substream);
 566
 567         mutex_unlock(&rtd->pcm_mutex);
 568         return ret;
 569 }
 570
 571 /*
 572  * Frees resources allocated by hw_params, can be called multiple times
 573  */
 574 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 575 {
 576         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 577         struct snd_soc_platform *platform = rtd->platform;
 578         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 579         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 580         struct snd_soc_codec *codec = rtd->codec;
 581
 582         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 583
 584         /* apply codec digital mute */
 585         if (!codec->active)
 586                 snd_soc_dai_digital_mute(codec_dai, 1);
 587
 588         /* free any machine hw params */
 589         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 590                 rtd->dai_link->ops->hw_free(substream);
 591
 592         /* free any DMA resources */
 593         if (platform->driver->ops && platform->driver->ops->hw_free)
 594                 platform->driver->ops->hw_free(substream);
 595
 596         /* now free hw params for the DAIs  */
 597         if (codec_dai->driver->ops->hw_free)
 598                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 599
 600         if (cpu_dai->driver->ops->hw_free)
 601                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 602
 603         mutex_unlock(&rtd->pcm_mutex);
 604         return 0;
 605 }
 606
 607 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 608 {
 609         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 610         struct snd_soc_platform *platform = rtd->platform;
 611         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 612         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 613         int ret;
 614
 615         if (codec_dai->driver->ops->trigger) {
 616                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
 617                 if (ret < 0)
 618                         return ret;
 619         }
 620
 621         if (platform->driver->ops && platform->driver->ops->trigger) {
 622                 ret = platform->driver->ops->trigger(substream, cmd);
 623                 if (ret < 0)
 624                         return ret;
 625         }
 626
 627         if (cpu_dai->driver->ops->trigger) {
 628                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 629                 if (ret < 0)
 630                         return ret;
 631         }
 632         return 0;
 633 }
 634
 635 int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream, int cmd)
 636 {
 637         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 638         struct snd_soc_platform *platform = rtd->platform;
 639         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 640         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 641         int ret;
 642
 643         if (codec_dai->driver->ops->bespoke_trigger) {
 644                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
 645                 if (ret < 0)
 646                         return ret;
 647         }
 648
 649         if (platform->driver->bespoke_trigger) {
 650                 ret = platform->driver->bespoke_trigger(substream, cmd);
 651                 if (ret < 0)
 652                         return ret;
 653         }
 654
 655         if (cpu_dai->driver->ops->bespoke_trigger) {
 656                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
 657                 if (ret < 0)
 658                         return ret;
 659         }
 660         return 0;
 661 }
 662 /*
 663  * soc level wrapper for pointer callback
 664  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 665  * the runtime->delay will be updated accordingly.
 666  */
 667 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 668 {
 669         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 670         struct snd_soc_platform *platform = rtd->platform;
 671         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 672         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 673         struct snd_pcm_runtime *runtime = substream->runtime;
 674         snd_pcm_uframes_t offset = 0;
 675         snd_pcm_sframes_t delay = 0;
 676
 677         if (platform->driver->ops && platform->driver->ops->pointer)
 678                 offset = platform->driver->ops->pointer(substream);
 679
 680         if (cpu_dai->driver->ops->delay)
 681                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 682
 683         if (codec_dai->driver->ops->delay)
 684                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 685
 686         if (platform->driver->delay)
 687                 delay += platform->driver->delay(substream, codec_dai);
 688
 689         runtime->delay = delay;
 690
 691         return offset;
 692 }
 693
 694 /* connect a FE and BE */
 695 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
 696                 struct snd_soc_pcm_runtime *be, int stream)
 697 {
 698         struct snd_soc_dpcm *dpcm;
 699
 700         /* only add new dpcms */
 701         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 702                 if (dpcm->be == be && dpcm->fe == fe)
 703                         return 0;
 704         }
 705
 706         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
 707         if (!dpcm)
 708                 return -ENOMEM;
 709
 710         dpcm->be = be;
 711         dpcm->fe = fe;
 712         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
 713         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
 714         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
 715         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
 716
 717         dev_dbg(fe->dev, "  connected new DPCM %s path %s %s %s\n",
 718                         stream ? "capture" : "playback",  fe->dai_link->name,
 719                         stream ? "<-" : "->", be->dai_link->name);
 720
 721 #ifdef CONFIG_DEBUG_FS
 722         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
 723                         fe->debugfs_dpcm_root, &dpcm->state);
 724 #endif
 725         return 1;
 726 }
 727
 728 /* reparent a BE onto another FE */
 729 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
 730                         struct snd_soc_pcm_runtime *be, int stream)
 731 {
 732         struct snd_soc_dpcm *dpcm;
 733         struct snd_pcm_substream *fe_substream, *be_substream;
 734
 735         /* reparent if BE is connected to other FEs */
 736         if (!be->dpcm[stream].users)
 737                 return;
 738
 739         be_substream = snd_soc_dpcm_get_substream(be, stream);
 740
 741         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
 742                 if (dpcm->fe == fe)
 743                         continue;
 744
 745                 dev_dbg(fe->dev, "  reparent %s path %s %s %s\n",
 746                         stream ? "capture" : "playback",
 747                         dpcm->fe->dai_link->name,
 748                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 749
 750                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
 751                 be_substream->runtime = fe_substream->runtime;
 752                 break;
 753         }
 754 }
 755
 756 /* disconnect a BE and FE */
 757 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
 758 {
 759         struct snd_soc_dpcm *dpcm, *d;
 760
 761         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
 762                 dev_dbg(fe->dev, "BE %s disconnect check for %s\n",
 763                                 stream ? "capture" : "playback",
 764                                 dpcm->be->dai_link->name);
 765
 766                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
 767                         continue;
 768
 769                 dev_dbg(fe->dev, "  freed DSP %s path %s %s %s\n",
 770                         stream ? "capture" : "playback", fe->dai_link->name,
 771                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 772
 773                 /* BEs still alive need new FE */
 774                 dpcm_be_reparent(fe, dpcm->be, stream);
 775
 776 #ifdef CONFIG_DEBUG_FS
 777                 debugfs_remove(dpcm->debugfs_state);
 778 #endif
 779                 list_del(&dpcm->list_be);
 780                 list_del(&dpcm->list_fe);
 781                 kfree(dpcm);
 782         }
 783 }
 784
 785 /* get BE for DAI widget and stream */
 786 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
 787                 struct snd_soc_dapm_widget *widget, int stream)
 788 {
 789         struct snd_soc_pcm_runtime *be;
 790         int i;
 791
 792         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 793                 for (i = 0; i < card->num_links; i++) {
 794                         be = &card->rtd[i];
 795
 796                         if (be->cpu_dai->playback_widget == widget ||
 797                                 be->codec_dai->playback_widget == widget)
 798                                 return be;
 799                 }
 800         } else {
 801
 802                 for (i = 0; i < card->num_links; i++) {
 803                         be = &card->rtd[i];
 804
 805                         if (be->cpu_dai->capture_widget == widget ||
 806                                 be->codec_dai->capture_widget == widget)
 807                                 return be;
 808                 }
 809         }
 810
 811         dev_err(card->dev, "can't get %s BE for %s\n",
 812                 stream ? "capture" : "playback", widget->name);
 813         return NULL;
 814 }
 815
 816 static inline struct snd_soc_dapm_widget *
 817         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 818 {
 819         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 820                 return rtd->cpu_dai->playback_widget;
 821         else
 822                 return rtd->cpu_dai->capture_widget;
 823 }
 824
 825 static inline struct snd_soc_dapm_widget *
 826         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 827 {
 828         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 829                 return rtd->codec_dai->playback_widget;
 830         else
 831                 return rtd->codec_dai->capture_widget;
 832 }
 833
 834 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 835                 struct snd_soc_dapm_widget *widget)
 836 {
 837         int i;
 838
 839         for (i = 0; i < list->num_widgets; i++) {
 840                 if (widget == list->widgets[i])
 841                         return 1;
 842         }
 843
 844         return 0;
 845 }
 846
 847 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 848         int stream, struct snd_soc_dapm_widget_list **list_)
 849 {
 850         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
 851         struct snd_soc_dapm_widget_list *list;
 852         int paths;
 853
 854         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
 855                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
 856         if (list == NULL)
 857                 return -ENOMEM;
 858
 859         /* get number of valid DAI paths and their widgets */
 860         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
 861
 862         dev_dbg(fe->dev, "found %d audio %s paths\n", paths,
 863                         stream ? "capture" : "playback");
 864
 865         *list_ = list;
 866         return paths;
 867 }
 868
 869 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 870 {
 871         kfree(*list);
 872 }
 873
 874 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
 875         struct snd_soc_dapm_widget_list **list_)
 876 {
 877         struct snd_soc_dpcm *dpcm;
 878         struct snd_soc_dapm_widget_list *list = *list_;
 879         struct snd_soc_dapm_widget *widget;
 880         int prune = 0;
 881
 882         /* Destroy any old FE <--> BE connections */
 883         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 884
 885                 /* is there a valid CPU DAI widget for this BE */
 886                 widget = rtd_get_cpu_widget(dpcm->be, stream);
 887
 888                 /* prune the BE if it's no longer in our active list */
 889                 if (widget && widget_in_list(list, widget))
 890                         continue;
 891
 892                 /* is there a valid CODEC DAI widget for this BE */
 893                 widget = rtd_get_codec_widget(dpcm->be, stream);
 894
 895                 /* prune the BE if it's no longer in our active list */
 896                 if (widget && widget_in_list(list, widget))
 897                         continue;
 898
 899                 dev_dbg(fe->dev, "pruning %s BE %s for %s\n",
 900                         stream ? "capture" : "playback",
 901                         dpcm->be->dai_link->name, fe->dai_link->name);
 902                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 903                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 904                 prune++;
 905         }
 906
 907         dev_dbg(fe->dev, "found %d old BE paths for pruning\n", prune);
 908         return prune;
 909 }
 910
 911 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
 912         struct snd_soc_dapm_widget_list **list_)
 913 {
 914         struct snd_soc_card *card = fe->card;
 915         struct snd_soc_dapm_widget_list *list = *list_;
 916         struct snd_soc_pcm_runtime *be;
 917         int i, new = 0, err;
 918
 919         /* Create any new FE <--> BE connections */
 920         for (i = 0; i < list->num_widgets; i++) {
 921
 922                 if (list->widgets[i]->id != snd_soc_dapm_dai)
 923                         continue;
 924
 925                 /* is there a valid BE rtd for this widget */
 926                 be = dpcm_get_be(card, list->widgets[i], stream);
 927                 if (!be) {
 928                         dev_err(fe->dev, "no BE found for %s\n",
 929                                         list->widgets[i]->name);
 930                         continue;
 931                 }
 932
 933                 /* make sure BE is a real BE */
 934                 if (!be->dai_link->no_pcm)
 935                         continue;
 936
 937                 /* don't connect if FE is not running */
 938                 if (!fe->dpcm[stream].runtime)
 939                         continue;
 940
 941                 /* newly connected FE and BE */
 942                 err = dpcm_be_connect(fe, be, stream);
 943                 if (err < 0) {
 944                         dev_err(fe->dev, "can't connect %s\n",
 945                                 list->widgets[i]->name);
 946                         break;
 947                 } else if (err == 0) /* already connected */
 948                         continue;
 949
 950                 /* new */
 951                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 952                 new++;
 953         }
 954
 955         dev_dbg(fe->dev, "found %d new BE paths\n", new);
 956         return new;
 957 }
 958
 959 /*
 960  * Find the corresponding BE DAIs that source or sink audio to this
 961  * FE substream.
 962  */
 963 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 964         int stream, struct snd_soc_dapm_widget_list **list, int new)
 965 {
 966         if (new)
 967                 return dpcm_add_paths(fe, stream, list);
 968         else
 969                 return dpcm_prune_paths(fe, stream, list);
 970 }
 971
 972 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
 973 {
 974         struct snd_soc_dpcm *dpcm;
 975
 976         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
 977                 dpcm->be->dpcm[stream].runtime_update =
 978                                                 SND_SOC_DPCM_UPDATE_NO;
 979 }
 980
 981 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
 982         int stream)
 983 {
 984         struct snd_soc_dpcm *dpcm;
 985
 986         /* disable any enabled and non active backends */
 987         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 988
 989                 struct snd_soc_pcm_runtime *be = dpcm->be;
 990                 struct snd_pcm_substream *be_substream =
 991                         snd_soc_dpcm_get_substream(be, stream);
 992
 993                 if (be->dpcm[stream].users == 0)
 994                         dev_err(be->dev, "no users %s at close - state %d\n",
 995                                 stream ? "capture" : "playback",
 996                                 be->dpcm[stream].state);
 997
 998                 if (--be->dpcm[stream].users != 0)
 999                         continue;
1000
1001                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1002                         continue;
1003
1004                 soc_pcm_close(be_substream);
1005                 be_substream->runtime = NULL;
1006                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1007         }
1008 }
1009
1010 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1011 {
1012         struct snd_soc_dpcm *dpcm;
1013         int err, count = 0;
1014
1015         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1016         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1017
1018                 struct snd_soc_pcm_runtime *be = dpcm->be;
1019                 struct snd_pcm_substream *be_substream =
1020                         snd_soc_dpcm_get_substream(be, stream);
1021
1022                 /* is this op for this BE ? */
1023                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1024                         continue;
1025
1026                 /* first time the dpcm is open ? */
1027                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1028                         dev_err(be->dev, "too many users %s at open %d\n",
1029                                 stream ? "capture" : "playback",
1030                                 be->dpcm[stream].state);
1031
1032                 if (be->dpcm[stream].users++ != 0)
1033                         continue;
1034
1035                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1036                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1037                         continue;
1038
1039                 dev_dbg(be->dev, "dpcm: open BE %s\n", be->dai_link->name);
1040
1041                 be_substream->runtime = be->dpcm[stream].runtime;
1042                 err = soc_pcm_open(be_substream);
1043                 if (err < 0) {
1044                         dev_err(be->dev, "BE open failed %d\n", err);
1045                         be->dpcm[stream].users--;
1046                         if (be->dpcm[stream].users < 0)
1047                                 dev_err(be->dev, "no users %s at unwind %d\n",
1048                                         stream ? "capture" : "playback",
1049                                         be->dpcm[stream].state);
1050
1051                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1052                         goto unwind;
1053                 }
1054
1055                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1056                 count++;
1057         }
1058
1059         return count;
1060
1061 unwind:
1062         /* disable any enabled and non active backends */
1063         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1064                 struct snd_soc_pcm_runtime *be = dpcm->be;
1065                 struct snd_pcm_substream *be_substream =
1066                         snd_soc_dpcm_get_substream(be, stream);
1067
1068                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1069                         continue;
1070
1071                 if (be->dpcm[stream].users == 0)
1072                         dev_err(be->dev, "no users %s at close %d\n",
1073                                 stream ? "capture" : "playback",
1074                                 be->dpcm[stream].state);
1075
1076                 if (--be->dpcm[stream].users != 0)
1077                         continue;
1078
1079                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1080                         continue;
1081
1082                 soc_pcm_close(be_substream);
1083                 be_substream->runtime = NULL;
1084                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1085         }
1086
1087         return err;
1088 }
1089
1090 void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1091 {
1092         struct snd_pcm_runtime *runtime = substream->runtime;
1093         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1094         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1095         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1096
1097         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1098                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1099                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1100                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1101                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1102                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1103                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1104         } else {
1105                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1106                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1107                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1108                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1109                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1110                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1111         }
1112 }
1113
1114 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1115 {
1116         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1117         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1118         int stream = fe_substream->stream, ret = 0;
1119
1120         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1121
1122         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1123         if (ret < 0) {
1124                 dev_err(fe->dev,"dpcm: failed to start some BEs %d\n", ret);
1125                 goto be_err;
1126         }
1127
1128         dev_dbg(fe->dev, "dpcm: open FE %s\n", fe->dai_link->name);
1129
1130         /* start the DAI frontend */
1131         ret = soc_pcm_open(fe_substream);
1132         if (ret < 0) {
1133                 dev_err(fe->dev,"dpcm: failed to start FE %d\n", ret);
1134                 goto unwind;
1135         }
1136
1137         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1138
1139         dpcm_set_fe_runtime(fe_substream);
1140         snd_pcm_limit_hw_rates(runtime);
1141
1142         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1143         return 0;
1144
1145 unwind:
1146         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1147 be_err:
1148         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1149         return ret;
1150 }
1151
1152 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1153 {
1154         struct snd_soc_dpcm *dpcm;
1155
1156         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1157         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1158
1159                 struct snd_soc_pcm_runtime *be = dpcm->be;
1160                 struct snd_pcm_substream *be_substream =
1161                         snd_soc_dpcm_get_substream(be, stream);
1162
1163                 /* is this op for this BE ? */
1164                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1165                         continue;
1166
1167                 if (be->dpcm[stream].users == 0)
1168                         dev_err(be->dev, "no users %s at close - state %d\n",
1169                                 stream ? "capture" : "playback",
1170                                 be->dpcm[stream].state);
1171
1172                 if (--be->dpcm[stream].users != 0)
1173                         continue;
1174
1175                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1176                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1177                         continue;
1178
1179                 dev_dbg(be->dev, "dpcm: close BE %s\n",
1180                         dpcm->fe->dai_link->name);
1181
1182                 soc_pcm_close(be_substream);
1183                 be_substream->runtime = NULL;
1184
1185                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1186         }
1187         return 0;
1188 }
1189
1190 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1191 {
1192         struct snd_soc_pcm_runtime *fe = substream->private_data;
1193         int stream = substream->stream;
1194
1195         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1196
1197         /* shutdown the BEs */
1198         dpcm_be_dai_shutdown(fe, substream->stream);
1199
1200         dev_dbg(fe->dev, "dpcm: close FE %s\n", fe->dai_link->name);
1201
1202         /* now shutdown the frontend */
1203         soc_pcm_close(substream);
1204
1205         /* run the stream event for each BE */
1206         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1207
1208         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1209         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1210         return 0;
1211 }
1212
1213 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1214 {
1215         struct snd_soc_dpcm *dpcm;
1216
1217         /* only hw_params backends that are either sinks or sources
1218          * to this frontend DAI */
1219         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1220
1221                 struct snd_soc_pcm_runtime *be = dpcm->be;
1222                 struct snd_pcm_substream *be_substream =
1223                         snd_soc_dpcm_get_substream(be, stream);
1224
1225                 /* is this op for this BE ? */
1226                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1227                         continue;
1228
1229                 /* only free hw when no longer used - check all FEs */
1230                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1231                                 continue;
1232
1233                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1234                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1235                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1236                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1237                         continue;
1238
1239                 dev_dbg(be->dev, "dpcm: hw_free BE %s\n",
1240                         dpcm->fe->dai_link->name);
1241
1242                 soc_pcm_hw_free(be_substream);
1243
1244                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1245         }
1246
1247         return 0;
1248 }
1249
1250 int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1251 {
1252         struct snd_soc_pcm_runtime *fe = substream->private_data;
1253         int err, stream = substream->stream;
1254
1255         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1256         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1257
1258         dev_dbg(fe->dev, "dpcm: hw_free FE %s\n", fe->dai_link->name);
1259
1260         /* call hw_free on the frontend */
1261         err = soc_pcm_hw_free(substream);
1262         if (err < 0)
1263                 dev_err(fe->dev,"dpcm: hw_free FE %s failed\n",
1264                         fe->dai_link->name);
1265
1266         /* only hw_params backends that are either sinks or sources
1267          * to this frontend DAI */
1268         err = dpcm_be_dai_hw_free(fe, stream);
1269
1270         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1271         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1272
1273         mutex_unlock(&fe->card->mutex);
1274         return 0;
1275 }
1276
1277 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1278 {
1279         struct snd_soc_dpcm *dpcm;
1280         int ret;
1281
1282         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1283
1284                 struct snd_soc_pcm_runtime *be = dpcm->be;
1285                 struct snd_pcm_substream *be_substream =
1286                         snd_soc_dpcm_get_substream(be, stream);
1287
1288                 /* is this op for this BE ? */
1289                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1290                         continue;
1291
1292                 /* only allow hw_params() if no connected FEs are running */
1293                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1294                         continue;
1295
1296                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1297                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1298                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1299                         continue;
1300
1301                 dev_dbg(be->dev, "dpcm: hw_params BE %s\n",
1302                         dpcm->fe->dai_link->name);
1303
1304                 /* copy params for each dpcm */
1305                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1306                                 sizeof(struct snd_pcm_hw_params));
1307
1308                 /* perform any hw_params fixups */
1309                 if (be->dai_link->be_hw_params_fixup) {
1310                         ret = be->dai_link->be_hw_params_fixup(be,
1311                                         &dpcm->hw_params);
1312                         if (ret < 0) {
1313                                 dev_err(be->dev,
1314                                         "dpcm: hw_params BE fixup failed %d\n",
1315                                         ret);
1316                                 goto unwind;
1317                         }
1318                 }
1319
1320                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1321                 if (ret < 0) {
1322                         dev_err(dpcm->be->dev,
1323                                 "dpcm: hw_params BE failed %d\n", ret);
1324                         goto unwind;
1325                 }
1326
1327                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1328         }
1329         return 0;
1330
1331 unwind:
1332         /* disable any enabled and non active backends */
1333         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1334                 struct snd_soc_pcm_runtime *be = dpcm->be;
1335                 struct snd_pcm_substream *be_substream =
1336                         snd_soc_dpcm_get_substream(be, stream);
1337
1338                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1339                         continue;
1340
1341                 /* only allow hw_free() if no connected FEs are running */
1342                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1343                         continue;
1344
1345                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1346                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1347                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1348                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1349                         continue;
1350
1351                 soc_pcm_hw_free(be_substream);
1352         }
1353
1354         return ret;
1355 }
1356
1357 int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1358                                     struct snd_pcm_hw_params *params)
1359 {
1360         struct snd_soc_pcm_runtime *fe = substream->private_data;
1361         int ret, stream = substream->stream;
1362
1363         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1364         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1365
1366         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1367                         sizeof(struct snd_pcm_hw_params));
1368         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1369         if (ret < 0) {
1370                 dev_err(fe->dev,"dpcm: hw_params BE failed %d\n", ret);
1371                 goto out;
1372         }
1373
1374         dev_dbg(fe->dev, "dpcm: hw_params FE %s rate %d chan %x fmt %d\n",
1375                         fe->dai_link->name, params_rate(params),
1376                         params_channels(params), params_format(params));
1377
1378         /* call hw_params on the frontend */
1379         ret = soc_pcm_hw_params(substream, params);
1380         if (ret < 0) {
1381                 dev_err(fe->dev,"dpcm: hw_params FE failed %d\n", ret);
1382                 dpcm_be_dai_hw_free(fe, stream);
1383          } else
1384                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1385
1386 out:
1387         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1388         mutex_unlock(&fe->card->mutex);
1389         return ret;
1390 }
1391
1392 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1393                 struct snd_pcm_substream *substream, int cmd)
1394 {
1395         int ret;
1396
1397         dev_dbg(dpcm->be->dev, "dpcm: trigger BE %s cmd %d\n",
1398                         dpcm->fe->dai_link->name, cmd);
1399
1400         ret = soc_pcm_trigger(substream, cmd);
1401         if (ret < 0)
1402                 dev_err(dpcm->be->dev,"dpcm: trigger BE failed %d\n", ret);
1403
1404         return ret;
1405 }
1406
1407 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, int cmd)
1408 {
1409         struct snd_soc_dpcm *dpcm;
1410         int ret = 0;
1411
1412         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1413
1414                 struct snd_soc_pcm_runtime *be = dpcm->be;
1415                 struct snd_pcm_substream *be_substream =
1416                         snd_soc_dpcm_get_substream(be, stream);
1417
1418                 /* is this op for this BE ? */
1419                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1420                         continue;
1421
1422                 switch (cmd) {
1423                 case SNDRV_PCM_TRIGGER_START:
1424                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1425                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1426                                 continue;
1427
1428                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1429                         if (ret)
1430                                 return ret;
1431
1432                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1433                         break;
1434                 case SNDRV_PCM_TRIGGER_RESUME:
1435                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1436                                 continue;
1437
1438                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1439                         if (ret)
1440                                 return ret;
1441
1442                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1443                         break;
1444                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1445                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1446                                 continue;
1447
1448                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1449                         if (ret)
1450                                 return ret;
1451
1452                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1453                         break;
1454                 case SNDRV_PCM_TRIGGER_STOP:
1455                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1456                                 continue;
1457
1458                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1459                                 continue;
1460
1461                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1462                         if (ret)
1463                                 return ret;
1464
1465                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1466                         break;
1467                 case SNDRV_PCM_TRIGGER_SUSPEND:
1468                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1469                                 continue;
1470
1471                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1472                                 continue;
1473
1474                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1475                         if (ret)
1476                                 return ret;
1477
1478                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1479                         break;
1480                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1481                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1482                                 continue;
1483
1484                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1485                                 continue;
1486
1487                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1488                         if (ret)
1489                                 return ret;
1490
1491                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1492                         break;
1493                 }
1494         }
1495
1496         return ret;
1497 }
1498 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1499
1500 int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1501 {
1502         struct snd_soc_pcm_runtime *fe = substream->private_data;
1503         int stream = substream->stream, ret;
1504         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1505
1506         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1507
1508         switch (trigger) {
1509         case SND_SOC_DPCM_TRIGGER_PRE:
1510                 /* call trigger on the frontend before the backend. */
1511
1512                 dev_dbg(fe->dev, "dpcm: pre trigger FE %s cmd %d\n",
1513                                 fe->dai_link->name, cmd);
1514
1515                 ret = soc_pcm_trigger(substream, cmd);
1516                 if (ret < 0) {
1517                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1518                         goto out;
1519                 }
1520
1521                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1522                 break;
1523         case SND_SOC_DPCM_TRIGGER_POST:
1524                 /* call trigger on the frontend after the backend. */
1525
1526                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1527                 if (ret < 0) {
1528                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1529                         goto out;
1530                 }
1531
1532                 dev_dbg(fe->dev, "dpcm: post trigger FE %s cmd %d\n",
1533                                 fe->dai_link->name, cmd);
1534
1535                 ret = soc_pcm_trigger(substream, cmd);
1536                 break;
1537         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1538                 /* bespoke trigger() - handles both FE and BEs */
1539
1540                 dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd %d\n",
1541                                 fe->dai_link->name, cmd);
1542
1543                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1544                 if (ret < 0) {
1545                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1546                         goto out;
1547                 }
1548                 break;
1549         default:
1550                 dev_err(fe->dev, "dpcm: invalid trigger cmd %d for %s\n", cmd,
1551                                 fe->dai_link->name);
1552                 ret = -EINVAL;
1553                 goto out;
1554         }
1555
1556         switch (cmd) {
1557         case SNDRV_PCM_TRIGGER_START:
1558         case SNDRV_PCM_TRIGGER_RESUME:
1559         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1560                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1561                 break;
1562         case SNDRV_PCM_TRIGGER_STOP:
1563         case SNDRV_PCM_TRIGGER_SUSPEND:
1564         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1565                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1566                 break;
1567         }
1568
1569 out:
1570         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1571         return ret;
1572 }
1573
1574 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1575 {
1576         struct snd_soc_dpcm *dpcm;
1577         int ret = 0;
1578
1579         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1580
1581                 struct snd_soc_pcm_runtime *be = dpcm->be;
1582                 struct snd_pcm_substream *be_substream =
1583                         snd_soc_dpcm_get_substream(be, stream);
1584
1585                 /* is this op for this BE ? */
1586                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1587                         continue;
1588
1589                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1590                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1591                         continue;
1592
1593                 dev_dbg(be->dev, "dpcm: prepare BE %s\n",
1594                         dpcm->fe->dai_link->name);
1595
1596                 ret = soc_pcm_prepare(be_substream);
1597                 if (ret < 0) {
1598                         dev_err(be->dev, "dpcm: backend prepare failed %d\n",
1599                                 ret);
1600                         break;
1601                 }
1602
1603                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1604         }
1605         return ret;
1606 }
1607
1608 int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1609 {
1610         struct snd_soc_pcm_runtime *fe = substream->private_data;
1611         int stream = substream->stream, ret = 0;
1612
1613         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1614
1615         dev_dbg(fe->dev, "dpcm: prepare FE %s\n", fe->dai_link->name);
1616
1617         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1618
1619         /* there is no point preparing this FE if there are no BEs */
1620         if (list_empty(&fe->dpcm[stream].be_clients)) {
1621                 dev_err(fe->dev, "dpcm: no backend DAIs enabled for %s\n",
1622                                 fe->dai_link->name);
1623                 ret = -EINVAL;
1624                 goto out;
1625         }
1626
1627         ret = dpcm_be_dai_prepare(fe, substream->stream);
1628         if (ret < 0)
1629                 goto out;
1630
1631         /* call prepare on the frontend */
1632         ret = soc_pcm_prepare(substream);
1633         if (ret < 0) {
1634                 dev_err(fe->dev,"dpcm: prepare FE %s failed\n",
1635                         fe->dai_link->name);
1636                 goto out;
1637         }
1638
1639         /* run the stream event for each BE */
1640         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1641         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1642
1643 out:
1644         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1645         mutex_unlock(&fe->card->mutex);
1646
1647         return ret;
1648 }
1649
1650 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1651                      unsigned int cmd, void *arg)
1652 {
1653         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1654         struct snd_soc_platform *platform = rtd->platform;
1655
1656         if (platform->driver->ops->ioctl)
1657                 return platform->driver->ops->ioctl(substream, cmd, arg);
1658         return snd_pcm_lib_ioctl(substream, cmd, arg);
1659 }
1660
1661 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1662 {
1663         struct snd_pcm_substream *substream =
1664                 snd_soc_dpcm_get_substream(fe, stream);
1665         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1666         int err;
1667
1668         dev_dbg(fe->dev, "runtime %s close on FE %s\n",
1669                         stream ? "capture" : "playback", fe->dai_link->name);
1670
1671         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1672                 /* call bespoke trigger - FE takes care of all BE triggers */
1673                 dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd stop\n",
1674                                 fe->dai_link->name);
1675
1676                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1677                 if (err < 0)
1678                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
1679         } else {
1680                 dev_dbg(fe->dev, "dpcm: trigger FE %s cmd stop\n",
1681                         fe->dai_link->name);
1682
1683                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1684                 if (err < 0)
1685                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
1686         }
1687
1688         err = dpcm_be_dai_hw_free(fe, stream);
1689         if (err < 0)
1690                 dev_err(fe->dev,"dpcm: hw_free FE failed %d\n", err);
1691
1692         err = dpcm_be_dai_shutdown(fe, stream);
1693         if (err < 0)
1694                 dev_err(fe->dev,"dpcm: shutdown FE failed %d\n", err);
1695
1696         /* run the stream event for each BE */
1697         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1698
1699         return 0;
1700 }
1701
1702 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1703 {
1704         struct snd_pcm_substream *substream =
1705                 snd_soc_dpcm_get_substream(fe, stream);
1706         struct snd_soc_dpcm *dpcm;
1707         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1708         int ret;
1709
1710         dev_dbg(fe->dev, "runtime %s open on FE %s\n",
1711                         stream ? "capture" : "playback", fe->dai_link->name);
1712
1713         /* Only start the BE if the FE is ready */
1714         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1715                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1716                 return -EINVAL;
1717
1718         /* startup must always be called for new BEs */
1719         ret = dpcm_be_dai_startup(fe, stream);
1720         if (ret < 0) {
1721                 goto disconnect;
1722                 return ret;
1723         }
1724
1725         /* keep going if FE state is > open */
1726         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1727                 return 0;
1728
1729         ret = dpcm_be_dai_hw_params(fe, stream);
1730         if (ret < 0) {
1731                 goto close;
1732                 return ret;
1733         }
1734
1735         /* keep going if FE state is > hw_params */
1736         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1737                 return 0;
1738
1739
1740         ret = dpcm_be_dai_prepare(fe, stream);
1741         if (ret < 0) {
1742                 goto hw_free;
1743                 return ret;
1744         }
1745
1746         /* run the stream event for each BE */
1747         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1748
1749         /* keep going if FE state is > prepare */
1750         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1751                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1752                 return 0;
1753
1754         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1755                 /* call trigger on the frontend - FE takes care of all BE triggers */
1756                 dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd start\n",
1757                                 fe->dai_link->name);
1758
1759                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1760                 if (ret < 0) {
1761                         dev_err(fe->dev,"dpcm: bespoke trigger FE failed %d\n", ret);
1762                         goto hw_free;
1763                 }
1764         } else {
1765                 dev_dbg(fe->dev, "dpcm: trigger FE %s cmd start\n",
1766                         fe->dai_link->name);
1767
1768                 ret = dpcm_be_dai_trigger(fe, stream,
1769                                         SNDRV_PCM_TRIGGER_START);
1770                 if (ret < 0) {
1771                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1772                         goto hw_free;
1773                 }
1774         }
1775
1776         return 0;
1777
1778 hw_free:
1779         dpcm_be_dai_hw_free(fe, stream);
1780 close:
1781         dpcm_be_dai_shutdown(fe, stream);
1782 disconnect:
1783         /* disconnect any non started BEs */
1784         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1785                 struct snd_soc_pcm_runtime *be = dpcm->be;
1786                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1787                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1788         }
1789
1790         return ret;
1791 }
1792
1793 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1794 {
1795         int ret;
1796
1797         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1798         ret = dpcm_run_update_startup(fe, stream);
1799         if (ret < 0)
1800                 dev_err(fe->dev, "failed to startup some BEs\n");
1801         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1802
1803         return ret;
1804 }
1805
1806 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1807 {
1808         int ret;
1809
1810         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1811         ret = dpcm_run_update_shutdown(fe, stream);
1812         if (ret < 0)
1813                 dev_err(fe->dev, "failed to shutdown some BEs\n");
1814         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1815
1816         return ret;
1817 }
1818
1819 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1820  * any DAI links.
1821  */
1822 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
1823 {
1824         struct snd_soc_card *card;
1825         int i, old, new, paths;
1826
1827         if (widget->codec)
1828                 card = widget->codec->card;
1829         else if (widget->platform)
1830                 card = widget->platform->card;
1831         else
1832                 return -EINVAL;
1833
1834         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1835         for (i = 0; i < card->num_rtd; i++) {
1836                 struct snd_soc_dapm_widget_list *list;
1837                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1838
1839                 /* make sure link is FE */
1840                 if (!fe->dai_link->dynamic)
1841                         continue;
1842
1843                 /* only check active links */
1844                 if (!fe->cpu_dai->active)
1845                         continue;
1846
1847                 /* DAPM sync will call this to update DSP paths */
1848                 dev_dbg(fe->dev, "DPCM runtime update for FE %s\n",
1849                         fe->dai_link->name);
1850
1851                 /* skip if FE doesn't have playback capability */
1852                 if (!fe->cpu_dai->driver->playback.channels_min)
1853                         goto capture;
1854
1855                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1856                 if (paths < 0) {
1857                         dev_warn(fe->dev, "%s no valid %s path\n",
1858                                         fe->dai_link->name,  "playback");
1859                         mutex_unlock(&card->mutex);
1860                         return paths;
1861                 }
1862
1863                 /* update any new playback paths */
1864                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1865                 if (new) {
1866                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1867                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1868                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1869                 }
1870
1871                 /* update any old playback paths */
1872                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1873                 if (old) {
1874                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1875                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1876                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1877                 }
1878
1879 capture:
1880                 /* skip if FE doesn't have capture capability */
1881                 if (!fe->cpu_dai->driver->capture.channels_min)
1882                         continue;
1883
1884                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1885                 if (paths < 0) {
1886                         dev_warn(fe->dev, "%s no valid %s path\n",
1887                                         fe->dai_link->name,  "capture");
1888                         mutex_unlock(&card->mutex);
1889                         return paths;
1890                 }
1891
1892                 /* update any new capture paths */
1893                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1894                 if (new) {
1895                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1896                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1897                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1898                 }
1899
1900                 /* update any old capture paths */
1901                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1902                 if (old) {
1903                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1904                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1905                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1906                 }
1907
1908                 dpcm_path_put(&list);
1909         }
1910
1911         mutex_unlock(&card->mutex);
1912         return 0;
1913 }
1914 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1915 {
1916         struct snd_soc_dpcm *dpcm;
1917         struct list_head *clients =
1918                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1919
1920         list_for_each_entry(dpcm, clients, list_be) {
1921
1922                 struct snd_soc_pcm_runtime *be = dpcm->be;
1923                 struct snd_soc_dai *dai = be->codec_dai;
1924                 struct snd_soc_dai_driver *drv = dai->driver;
1925
1926                 if (be->dai_link->ignore_suspend)
1927                         continue;
1928
1929                 dev_dbg(be->dev, "BE digital mute %s\n", be->dai_link->name);
1930
1931                 if (drv->ops->digital_mute && dai->playback_active)
1932                                 drv->ops->digital_mute(dai, mute);
1933         }
1934
1935         return 0;
1936 }
1937
1938 int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1939 {
1940         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1941         struct snd_soc_dpcm *dpcm;
1942         struct snd_soc_dapm_widget_list *list;
1943         int ret;
1944         int stream = fe_substream->stream;
1945
1946         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1947         fe->dpcm[stream].runtime = fe_substream->runtime;
1948
1949         if (dpcm_path_get(fe, stream, &list) <= 0) {
1950                 dev_warn(fe->dev, "asoc: %s no valid %s route\n",
1951                         fe->dai_link->name, stream ? "capture" : "playback");
1952                         mutex_unlock(&fe->card->mutex);
1953                         return -EINVAL;
1954         }
1955
1956         /* calculate valid and active FE <-> BE dpcms */
1957         dpcm_process_paths(fe, stream, &list, 1);
1958
1959         ret = dpcm_fe_dai_startup(fe_substream);
1960         if (ret < 0) {
1961                 /* clean up all links */
1962                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1963                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1964
1965                 dpcm_be_disconnect(fe, stream);
1966                 fe->dpcm[stream].runtime = NULL;
1967         }
1968
1969         dpcm_clear_pending_state(fe, stream);
1970         dpcm_path_put(&list);
1971         mutex_unlock(&fe->card->mutex);
1972         return ret;
1973 }
1974
1975 int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1976 {
1977         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1978         struct snd_soc_dpcm *dpcm;
1979         int stream = fe_substream->stream, ret;
1980
1981         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1982         ret = dpcm_fe_dai_shutdown(fe_substream);
1983
1984         /* mark FE's links ready to prune */
1985         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1986                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1987
1988         dpcm_be_disconnect(fe, stream);
1989
1990         fe->dpcm[stream].runtime = NULL;
1991         mutex_unlock(&fe->card->mutex);
1992         return ret;
1993 }
1994
1995 /* create a new pcm */
1996 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
1997 {
1998         struct snd_soc_codec *codec = rtd->codec;
1999         struct snd_soc_platform *platform = rtd->platform;
2000         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2001         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2002         struct snd_pcm *pcm;
2003         char new_name[64];
2004         int ret = 0, playback = 0, capture = 0;
2005
2006         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2007                 if (cpu_dai->driver->playback.channels_min)
2008                         playback = 1;
2009                 if (cpu_dai->driver->capture.channels_min)
2010                         capture = 1;
2011         } else {
2012                 if (codec_dai->driver->playback.channels_min)
2013                         playback = 1;
2014                 if (codec_dai->driver->capture.channels_min)
2015                         capture = 1;
2016         }
2017
2018         /* create the PCM */
2019         if (rtd->dai_link->no_pcm) {
2020                 snprintf(new_name, sizeof(new_name), "(%s)",
2021                         rtd->dai_link->stream_name);
2022
2023                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2024                                 playback, capture, &pcm);
2025         } else {
2026                 if (rtd->dai_link->dynamic)
2027                         snprintf(new_name, sizeof(new_name), "%s (*)",
2028                                 rtd->dai_link->stream_name);
2029                 else
2030                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2031                                 rtd->dai_link->stream_name, codec_dai->name, num);
2032
2033                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2034                         capture, &pcm);
2035         }
2036         if (ret < 0) {
2037                 printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
2038                 return ret;
2039         }
2040         dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num, new_name);
2041
2042         /* DAPM dai link stream work */
2043         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2044
2045         rtd->pcm = pcm;
2046         pcm->private_data = rtd;
2047
2048         if (rtd->dai_link->no_pcm) {
2049                 if (playback)
2050                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2051                 if (capture)
2052                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2053                 goto out;
2054         }
2055
2056         /* ASoC PCM operations */
2057         if (rtd->dai_link->dynamic) {
2058                 rtd->ops.open           = dpcm_fe_dai_open;
2059                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2060                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2061                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2062                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2063                 rtd->ops.close          = dpcm_fe_dai_close;
2064                 rtd->ops.pointer        = soc_pcm_pointer;
2065                 rtd->ops.ioctl          = soc_pcm_ioctl;
2066         } else {
2067                 rtd->ops.open           = soc_pcm_open;
2068                 rtd->ops.hw_params      = soc_pcm_hw_params;
2069                 rtd->ops.prepare        = soc_pcm_prepare;
2070                 rtd->ops.trigger        = soc_pcm_trigger;
2071                 rtd->ops.hw_free        = soc_pcm_hw_free;
2072                 rtd->ops.close          = soc_pcm_close;
2073                 rtd->ops.pointer        = soc_pcm_pointer;
2074                 rtd->ops.ioctl          = soc_pcm_ioctl;
2075         }
2076
2077         if (platform->driver->ops) {
2078                 rtd->ops.ack            = platform->driver->ops->ack;
2079                 rtd->ops.copy           = platform->driver->ops->copy;
2080                 rtd->ops.silence        = platform->driver->ops->silence;
2081                 rtd->ops.page           = platform->driver->ops->page;
2082                 rtd->ops.mmap           = platform->driver->ops->mmap;
2083         }
2084
2085         if (playback)
2086                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2087
2088         if (capture)
2089                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2090
2091         if (platform->driver->pcm_new) {
2092                 ret = platform->driver->pcm_new(rtd);
2093                 if (ret < 0) {
2094                         pr_err("asoc: platform pcm constructor failed\n");
2095                         return ret;
2096                 }
2097         }
2098
2099         pcm->private_free = platform->driver->pcm_free;
2100 out:
2101         printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
2102                 cpu_dai->name);
2103         return ret;
2104 }
2105
2106 /* is the current PCM operation for this FE ? */
2107 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2108 {
2109         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2110                 return 1;
2111         return 0;
2112 }
2113 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2114
2115 /* is the current PCM operation for this BE ? */
2116 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2117                 struct snd_soc_pcm_runtime *be, int stream)
2118 {
2119         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2120            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2121                   be->dpcm[stream].runtime_update))
2122                 return 1;
2123         return 0;
2124 }
2125 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2126
2127 /* get the substream for this BE */
2128 struct snd_pcm_substream *
2129         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2130 {
2131         return be->pcm->streams[stream].substream;
2132 }
2133 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2134
2135 /* get the BE runtime state */
2136 enum snd_soc_dpcm_state
2137         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2138 {
2139         return be->dpcm[stream].state;
2140 }
2141 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2142
2143 /* set the BE runtime state */
2144 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2145                 int stream, enum snd_soc_dpcm_state state)
2146 {
2147         be->dpcm[stream].state = state;
2148 }
2149 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2150
2151 /*
2152  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2153  * are not running, paused or suspended for the specified stream direction.
2154  */
2155 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2156                 struct snd_soc_pcm_runtime *be, int stream)
2157 {
2158         struct snd_soc_dpcm *dpcm;
2159         int state;
2160
2161         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2162
2163                 if (dpcm->fe == fe)
2164                         continue;
2165
2166                 state = dpcm->fe->dpcm[stream].state;
2167                 if (state == SND_SOC_DPCM_STATE_START ||
2168                         state == SND_SOC_DPCM_STATE_PAUSED ||
2169                         state == SND_SOC_DPCM_STATE_SUSPEND)
2170                         return 0;
2171         }
2172
2173         /* it's safe to free/stop this BE DAI */
2174         return 1;
2175 }
2176 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2177
2178 /*
2179  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2180  * running, paused or suspended for the specified stream direction.
2181  */
2182 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2183                 struct snd_soc_pcm_runtime *be, int stream)
2184 {
2185         struct snd_soc_dpcm *dpcm;
2186         int state;
2187
2188         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2189
2190                 if (dpcm->fe == fe)
2191                         continue;
2192
2193                 state = dpcm->fe->dpcm[stream].state;
2194                 if (state == SND_SOC_DPCM_STATE_START ||
2195                         state == SND_SOC_DPCM_STATE_PAUSED ||
2196                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2197                         state == SND_SOC_DPCM_STATE_PREPARE)
2198                         return 0;
2199         }
2200
2201         /* it's safe to change hw_params */
2202         return 1;
2203 }
2204 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2205
2206 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2207                 int cmd, struct snd_soc_platform *platform)
2208 {
2209         if (platform->driver->ops->trigger)
2210                 return platform->driver->ops->trigger(substream, cmd);
2211         return 0;
2212 }
2213 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2214
2215 #ifdef CONFIG_DEBUG_FS
2216 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2217 {
2218         switch (state) {
2219         case SND_SOC_DPCM_STATE_NEW:
2220                 return "new";
2221         case SND_SOC_DPCM_STATE_OPEN:
2222                 return "open";
2223         case SND_SOC_DPCM_STATE_HW_PARAMS:
2224                 return "hw_params";
2225         case SND_SOC_DPCM_STATE_PREPARE:
2226                 return "prepare";
2227         case SND_SOC_DPCM_STATE_START:
2228                 return "start";
2229         case SND_SOC_DPCM_STATE_STOP:
2230                 return "stop";
2231         case SND_SOC_DPCM_STATE_SUSPEND:
2232                 return "suspend";
2233         case SND_SOC_DPCM_STATE_PAUSED:
2234                 return "paused";
2235         case SND_SOC_DPCM_STATE_HW_FREE:
2236                 return "hw_free";
2237         case SND_SOC_DPCM_STATE_CLOSE:
2238                 return "close";
2239         }
2240
2241         return "unknown";
2242 }
2243
2244 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2245                                 int stream, char *buf, size_t size)
2246 {
2247         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2248         struct snd_soc_dpcm *dpcm;
2249         ssize_t offset = 0;
2250
2251         /* FE state */
2252         offset += snprintf(buf + offset, size - offset,
2253                         "[%s - %s]\n", fe->dai_link->name,
2254                         stream ? "Capture" : "Playback");
2255
2256         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2257                         dpcm_state_string(fe->dpcm[stream].state));
2258
2259         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2260             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2261                 offset += snprintf(buf + offset, size - offset,
2262                                 "Hardware Params: "
2263                                 "Format = %s, Channels = %d, Rate = %d\n",
2264                                 snd_pcm_format_name(params_format(params)),
2265                                 params_channels(params),
2266                                 params_rate(params));
2267
2268         /* BEs state */
2269         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2270
2271         if (list_empty(&fe->dpcm[stream].be_clients)) {
2272                 offset += snprintf(buf + offset, size - offset,
2273                                 " No active DSP links\n");
2274                 goto out;
2275         }
2276
2277         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2278                 struct snd_soc_pcm_runtime *be = dpcm->be;
2279                 params = &dpcm->hw_params;
2280
2281                 offset += snprintf(buf + offset, size - offset,
2282                                 "- %s\n", be->dai_link->name);
2283
2284                 offset += snprintf(buf + offset, size - offset,
2285                                 "   State: %s\n",
2286                                 dpcm_state_string(be->dpcm[stream].state));
2287
2288                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2289                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2290                         offset += snprintf(buf + offset, size - offset,
2291                                 "   Hardware Params: "
2292                                 "Format = %s, Channels = %d, Rate = %d\n",
2293                                 snd_pcm_format_name(params_format(params)),
2294                                 params_channels(params),
2295                                 params_rate(params));
2296         }
2297
2298 out:
2299         return offset;
2300 }
2301
2302 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2303                                 size_t count, loff_t *ppos)
2304 {
2305         struct snd_soc_pcm_runtime *fe = file->private_data;
2306         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2307         char *buf;
2308
2309         buf = kmalloc(out_count, GFP_KERNEL);
2310         if (!buf)
2311                 return -ENOMEM;
2312
2313         if (fe->cpu_dai->driver->playback.channels_min)
2314                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2315                                         buf + offset, out_count - offset);
2316
2317         if (fe->cpu_dai->driver->capture.channels_min)
2318                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2319                                         buf + offset, out_count - offset);
2320
2321         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2322
2323         kfree(buf);
2324         return ret;
2325 }
2326
2327 static const struct file_operations dpcm_state_fops = {
2328         .open = simple_open,
2329         .read = dpcm_state_read_file,
2330         .llseek = default_llseek,
2331 };
2332
2333 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2334 {
2335         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2336                         rtd->card->debugfs_card_root);
2337         if (!rtd->debugfs_dpcm_root) {
2338                 dev_dbg(rtd->dev,
2339                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2340                          rtd->dai_link->name);
2341                 return -EINVAL;
2342         }
2343
2344         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2345                                                 rtd->debugfs_dpcm_root,
2346                                                 rtd, &dpcm_state_fops);
2347
2348         return 0;
2349 }
2350 #endif