Pileus Git - ~andy/linux/blob - 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 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
 636                                    int cmd)
 637 {
 638         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 639         struct snd_soc_platform *platform = rtd->platform;
 640         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 641         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 642         int ret;
 643
 644         if (codec_dai->driver->ops->bespoke_trigger) {
 645                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
 646                 if (ret < 0)
 647                         return ret;
 648         }
 649
 650         if (platform->driver->bespoke_trigger) {
 651                 ret = platform->driver->bespoke_trigger(substream, cmd);
 652                 if (ret < 0)
 653                         return ret;
 654         }
 655
 656         if (cpu_dai->driver->ops->bespoke_trigger) {
 657                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
 658                 if (ret < 0)
 659                         return ret;
 660         }
 661         return 0;
 662 }
 663 /*
 664  * soc level wrapper for pointer callback
 665  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 666  * the runtime->delay will be updated accordingly.
 667  */
 668 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 669 {
 670         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 671         struct snd_soc_platform *platform = rtd->platform;
 672         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 673         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 674         struct snd_pcm_runtime *runtime = substream->runtime;
 675         snd_pcm_uframes_t offset = 0;
 676         snd_pcm_sframes_t delay = 0;
 677
 678         if (platform->driver->ops && platform->driver->ops->pointer)
 679                 offset = platform->driver->ops->pointer(substream);
 680
 681         if (cpu_dai->driver->ops->delay)
 682                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 683
 684         if (codec_dai->driver->ops->delay)
 685                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 686
 687         if (platform->driver->delay)
 688                 delay += platform->driver->delay(substream, codec_dai);
 689
 690         runtime->delay = delay;
 691
 692         return offset;
 693 }
 694
 695 /* connect a FE and BE */
 696 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
 697                 struct snd_soc_pcm_runtime *be, int stream)
 698 {
 699         struct snd_soc_dpcm *dpcm;
 700
 701         /* only add new dpcms */
 702         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 703                 if (dpcm->be == be && dpcm->fe == fe)
 704                         return 0;
 705         }
 706
 707         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
 708         if (!dpcm)
 709                 return -ENOMEM;
 710
 711         dpcm->be = be;
 712         dpcm->fe = fe;
 713         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
 714         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
 715         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
 716         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
 717
 718         dev_dbg(fe->dev, "  connected new DPCM %s path %s %s %s\n",
 719                         stream ? "capture" : "playback",  fe->dai_link->name,
 720                         stream ? "<-" : "->", be->dai_link->name);
 721
 722 #ifdef CONFIG_DEBUG_FS
 723         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
 724                         fe->debugfs_dpcm_root, &dpcm->state);
 725 #endif
 726         return 1;
 727 }
 728
 729 /* reparent a BE onto another FE */
 730 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
 731                         struct snd_soc_pcm_runtime *be, int stream)
 732 {
 733         struct snd_soc_dpcm *dpcm;
 734         struct snd_pcm_substream *fe_substream, *be_substream;
 735
 736         /* reparent if BE is connected to other FEs */
 737         if (!be->dpcm[stream].users)
 738                 return;
 739
 740         be_substream = snd_soc_dpcm_get_substream(be, stream);
 741
 742         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
 743                 if (dpcm->fe == fe)
 744                         continue;
 745
 746                 dev_dbg(fe->dev, "  reparent %s path %s %s %s\n",
 747                         stream ? "capture" : "playback",
 748                         dpcm->fe->dai_link->name,
 749                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 750
 751                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
 752                 be_substream->runtime = fe_substream->runtime;
 753                 break;
 754         }
 755 }
 756
 757 /* disconnect a BE and FE */
 758 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
 759 {
 760         struct snd_soc_dpcm *dpcm, *d;
 761
 762         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
 763                 dev_dbg(fe->dev, "BE %s disconnect check for %s\n",
 764                                 stream ? "capture" : "playback",
 765                                 dpcm->be->dai_link->name);
 766
 767                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
 768                         continue;
 769
 770                 dev_dbg(fe->dev, "  freed DSP %s path %s %s %s\n",
 771                         stream ? "capture" : "playback", fe->dai_link->name,
 772                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 773
 774                 /* BEs still alive need new FE */
 775                 dpcm_be_reparent(fe, dpcm->be, stream);
 776
 777 #ifdef CONFIG_DEBUG_FS
 778                 debugfs_remove(dpcm->debugfs_state);
 779 #endif
 780                 list_del(&dpcm->list_be);
 781                 list_del(&dpcm->list_fe);
 782                 kfree(dpcm);
 783         }
 784 }
 785
 786 /* get BE for DAI widget and stream */
 787 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
 788                 struct snd_soc_dapm_widget *widget, int stream)
 789 {
 790         struct snd_soc_pcm_runtime *be;
 791         int i;
 792
 793         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 794                 for (i = 0; i < card->num_links; i++) {
 795                         be = &card->rtd[i];
 796
 797                         if (!be->dai_link->no_pcm)
 798                                 continue;
 799
 800                         if (be->cpu_dai->playback_widget == widget ||
 801                                 be->codec_dai->playback_widget == widget)
 802                                 return be;
 803                 }
 804         } else {
 805
 806                 for (i = 0; i < card->num_links; i++) {
 807                         be = &card->rtd[i];
 808
 809                         if (!be->dai_link->no_pcm)
 810                                 continue;
 811
 812                         if (be->cpu_dai->capture_widget == widget ||
 813                                 be->codec_dai->capture_widget == widget)
 814                                 return be;
 815                 }
 816         }
 817
 818         dev_err(card->dev, "can't get %s BE for %s\n",
 819                 stream ? "capture" : "playback", widget->name);
 820         return NULL;
 821 }
 822
 823 static inline struct snd_soc_dapm_widget *
 824         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 825 {
 826         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 827                 return rtd->cpu_dai->playback_widget;
 828         else
 829                 return rtd->cpu_dai->capture_widget;
 830 }
 831
 832 static inline struct snd_soc_dapm_widget *
 833         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 834 {
 835         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 836                 return rtd->codec_dai->playback_widget;
 837         else
 838                 return rtd->codec_dai->capture_widget;
 839 }
 840
 841 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 842                 struct snd_soc_dapm_widget *widget)
 843 {
 844         int i;
 845
 846         for (i = 0; i < list->num_widgets; i++) {
 847                 if (widget == list->widgets[i])
 848                         return 1;
 849         }
 850
 851         return 0;
 852 }
 853
 854 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 855         int stream, struct snd_soc_dapm_widget_list **list_)
 856 {
 857         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
 858         struct snd_soc_dapm_widget_list *list;
 859         int paths;
 860
 861         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
 862                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
 863         if (list == NULL)
 864                 return -ENOMEM;
 865
 866         /* get number of valid DAI paths and their widgets */
 867         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
 868
 869         dev_dbg(fe->dev, "found %d audio %s paths\n", paths,
 870                         stream ? "capture" : "playback");
 871
 872         *list_ = list;
 873         return paths;
 874 }
 875
 876 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 877 {
 878         kfree(*list);
 879 }
 880
 881 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
 882         struct snd_soc_dapm_widget_list **list_)
 883 {
 884         struct snd_soc_dpcm *dpcm;
 885         struct snd_soc_dapm_widget_list *list = *list_;
 886         struct snd_soc_dapm_widget *widget;
 887         int prune = 0;
 888
 889         /* Destroy any old FE <--> BE connections */
 890         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 891
 892                 /* is there a valid CPU DAI widget for this BE */
 893                 widget = rtd_get_cpu_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                 /* is there a valid CODEC DAI widget for this BE */
 900                 widget = rtd_get_codec_widget(dpcm->be, stream);
 901
 902                 /* prune the BE if it's no longer in our active list */
 903                 if (widget && widget_in_list(list, widget))
 904                         continue;
 905
 906                 dev_dbg(fe->dev, "pruning %s BE %s for %s\n",
 907                         stream ? "capture" : "playback",
 908                         dpcm->be->dai_link->name, fe->dai_link->name);
 909                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 910                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 911                 prune++;
 912         }
 913
 914         dev_dbg(fe->dev, "found %d old BE paths for pruning\n", prune);
 915         return prune;
 916 }
 917
 918 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
 919         struct snd_soc_dapm_widget_list **list_)
 920 {
 921         struct snd_soc_card *card = fe->card;
 922         struct snd_soc_dapm_widget_list *list = *list_;
 923         struct snd_soc_pcm_runtime *be;
 924         int i, new = 0, err;
 925
 926         /* Create any new FE <--> BE connections */
 927         for (i = 0; i < list->num_widgets; i++) {
 928
 929                 if (list->widgets[i]->id != snd_soc_dapm_dai)
 930                         continue;
 931
 932                 /* is there a valid BE rtd for this widget */
 933                 be = dpcm_get_be(card, list->widgets[i], stream);
 934                 if (!be) {
 935                         dev_err(fe->dev, "no BE found for %s\n",
 936                                         list->widgets[i]->name);
 937                         continue;
 938                 }
 939
 940                 /* make sure BE is a real BE */
 941                 if (!be->dai_link->no_pcm)
 942                         continue;
 943
 944                 /* don't connect if FE is not running */
 945                 if (!fe->dpcm[stream].runtime)
 946                         continue;
 947
 948                 /* newly connected FE and BE */
 949                 err = dpcm_be_connect(fe, be, stream);
 950                 if (err < 0) {
 951                         dev_err(fe->dev, "can't connect %s\n",
 952                                 list->widgets[i]->name);
 953                         break;
 954                 } else if (err == 0) /* already connected */
 955                         continue;
 956
 957                 /* new */
 958                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 959                 new++;
 960         }
 961
 962         dev_dbg(fe->dev, "found %d new BE paths\n", new);
 963         return new;
 964 }
 965
 966 /*
 967  * Find the corresponding BE DAIs that source or sink audio to this
 968  * FE substream.
 969  */
 970 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 971         int stream, struct snd_soc_dapm_widget_list **list, int new)
 972 {
 973         if (new)
 974                 return dpcm_add_paths(fe, stream, list);
 975         else
 976                 return dpcm_prune_paths(fe, stream, list);
 977 }
 978
 979 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
 980 {
 981         struct snd_soc_dpcm *dpcm;
 982
 983         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
 984                 dpcm->be->dpcm[stream].runtime_update =
 985                                                 SND_SOC_DPCM_UPDATE_NO;
 986 }
 987
 988 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
 989         int stream)
 990 {
 991         struct snd_soc_dpcm *dpcm;
 992
 993         /* disable any enabled and non active backends */
 994         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 995
 996                 struct snd_soc_pcm_runtime *be = dpcm->be;
 997                 struct snd_pcm_substream *be_substream =
 998                         snd_soc_dpcm_get_substream(be, stream);
 999
1000                 if (be->dpcm[stream].users == 0)
1001                         dev_err(be->dev, "no users %s at close - state %d\n",
1002                                 stream ? "capture" : "playback",
1003                                 be->dpcm[stream].state);
1004
1005                 if (--be->dpcm[stream].users != 0)
1006                         continue;
1007
1008                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1009                         continue;
1010
1011                 soc_pcm_close(be_substream);
1012                 be_substream->runtime = NULL;
1013                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1014         }
1015 }
1016
1017 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1018 {
1019         struct snd_soc_dpcm *dpcm;
1020         int err, count = 0;
1021
1022         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1023         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1024
1025                 struct snd_soc_pcm_runtime *be = dpcm->be;
1026                 struct snd_pcm_substream *be_substream =
1027                         snd_soc_dpcm_get_substream(be, stream);
1028
1029                 /* is this op for this BE ? */
1030                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1031                         continue;
1032
1033                 /* first time the dpcm is open ? */
1034                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1035                         dev_err(be->dev, "too many users %s at open %d\n",
1036                                 stream ? "capture" : "playback",
1037                                 be->dpcm[stream].state);
1038
1039                 if (be->dpcm[stream].users++ != 0)
1040                         continue;
1041
1042                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1043                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1044                         continue;
1045
1046                 dev_dbg(be->dev, "dpcm: open BE %s\n", be->dai_link->name);
1047
1048                 be_substream->runtime = be->dpcm[stream].runtime;
1049                 err = soc_pcm_open(be_substream);
1050                 if (err < 0) {
1051                         dev_err(be->dev, "BE open failed %d\n", err);
1052                         be->dpcm[stream].users--;
1053                         if (be->dpcm[stream].users < 0)
1054                                 dev_err(be->dev, "no users %s at unwind %d\n",
1055                                         stream ? "capture" : "playback",
1056                                         be->dpcm[stream].state);
1057
1058                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1059                         goto unwind;
1060                 }
1061
1062                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1063                 count++;
1064         }
1065
1066         return count;
1067
1068 unwind:
1069         /* disable any enabled and non active backends */
1070         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1071                 struct snd_soc_pcm_runtime *be = dpcm->be;
1072                 struct snd_pcm_substream *be_substream =
1073                         snd_soc_dpcm_get_substream(be, stream);
1074
1075                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1076                         continue;
1077
1078                 if (be->dpcm[stream].users == 0)
1079                         dev_err(be->dev, "no users %s at close %d\n",
1080                                 stream ? "capture" : "playback",
1081                                 be->dpcm[stream].state);
1082
1083                 if (--be->dpcm[stream].users != 0)
1084                         continue;
1085
1086                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1087                         continue;
1088
1089                 soc_pcm_close(be_substream);
1090                 be_substream->runtime = NULL;
1091                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1092         }
1093
1094         return err;
1095 }
1096
1097 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1098 {
1099         struct snd_pcm_runtime *runtime = substream->runtime;
1100         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1101         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1102         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1103
1104         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1105                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1106                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1107                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1108                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1109                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1110                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1111         } else {
1112                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1113                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1114                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1115                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1116                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1117                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1118         }
1119 }
1120
1121 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1122 {
1123         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1124         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1125         int stream = fe_substream->stream, ret = 0;
1126
1127         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1128
1129         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1130         if (ret < 0) {
1131                 dev_err(fe->dev,"dpcm: failed to start some BEs %d\n", ret);
1132                 goto be_err;
1133         }
1134
1135         dev_dbg(fe->dev, "dpcm: open FE %s\n", fe->dai_link->name);
1136
1137         /* start the DAI frontend */
1138         ret = soc_pcm_open(fe_substream);
1139         if (ret < 0) {
1140                 dev_err(fe->dev,"dpcm: failed to start FE %d\n", ret);
1141                 goto unwind;
1142         }
1143
1144         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1145
1146         dpcm_set_fe_runtime(fe_substream);
1147         snd_pcm_limit_hw_rates(runtime);
1148
1149         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1150         return 0;
1151
1152 unwind:
1153         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1154 be_err:
1155         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1156         return ret;
1157 }
1158
1159 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1160 {
1161         struct snd_soc_dpcm *dpcm;
1162
1163         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1164         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1165
1166                 struct snd_soc_pcm_runtime *be = dpcm->be;
1167                 struct snd_pcm_substream *be_substream =
1168                         snd_soc_dpcm_get_substream(be, stream);
1169
1170                 /* is this op for this BE ? */
1171                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1172                         continue;
1173
1174                 if (be->dpcm[stream].users == 0)
1175                         dev_err(be->dev, "no users %s at close - state %d\n",
1176                                 stream ? "capture" : "playback",
1177                                 be->dpcm[stream].state);
1178
1179                 if (--be->dpcm[stream].users != 0)
1180                         continue;
1181
1182                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1183                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1184                         continue;
1185
1186                 dev_dbg(be->dev, "dpcm: close BE %s\n",
1187                         dpcm->fe->dai_link->name);
1188
1189                 soc_pcm_close(be_substream);
1190                 be_substream->runtime = NULL;
1191
1192                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1193         }
1194         return 0;
1195 }
1196
1197 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1198 {
1199         struct snd_soc_pcm_runtime *fe = substream->private_data;
1200         int stream = substream->stream;
1201
1202         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1203
1204         /* shutdown the BEs */
1205         dpcm_be_dai_shutdown(fe, substream->stream);
1206
1207         dev_dbg(fe->dev, "dpcm: close FE %s\n", fe->dai_link->name);
1208
1209         /* now shutdown the frontend */
1210         soc_pcm_close(substream);
1211
1212         /* run the stream event for each BE */
1213         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1214
1215         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1216         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1217         return 0;
1218 }
1219
1220 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1221 {
1222         struct snd_soc_dpcm *dpcm;
1223
1224         /* only hw_params backends that are either sinks or sources
1225          * to this frontend DAI */
1226         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1227
1228                 struct snd_soc_pcm_runtime *be = dpcm->be;
1229                 struct snd_pcm_substream *be_substream =
1230                         snd_soc_dpcm_get_substream(be, stream);
1231
1232                 /* is this op for this BE ? */
1233                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1234                         continue;
1235
1236                 /* only free hw when no longer used - check all FEs */
1237                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1238                                 continue;
1239
1240                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1241                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1242                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1243                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1244                         continue;
1245
1246                 dev_dbg(be->dev, "dpcm: hw_free BE %s\n",
1247                         dpcm->fe->dai_link->name);
1248
1249                 soc_pcm_hw_free(be_substream);
1250
1251                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1252         }
1253
1254         return 0;
1255 }
1256
1257 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1258 {
1259         struct snd_soc_pcm_runtime *fe = substream->private_data;
1260         int err, stream = substream->stream;
1261
1262         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1263         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1264
1265         dev_dbg(fe->dev, "dpcm: hw_free FE %s\n", fe->dai_link->name);
1266
1267         /* call hw_free on the frontend */
1268         err = soc_pcm_hw_free(substream);
1269         if (err < 0)
1270                 dev_err(fe->dev,"dpcm: hw_free FE %s failed\n",
1271                         fe->dai_link->name);
1272
1273         /* only hw_params backends that are either sinks or sources
1274          * to this frontend DAI */
1275         err = dpcm_be_dai_hw_free(fe, stream);
1276
1277         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1278         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1279
1280         mutex_unlock(&fe->card->mutex);
1281         return 0;
1282 }
1283
1284 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1285 {
1286         struct snd_soc_dpcm *dpcm;
1287         int ret;
1288
1289         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1290
1291                 struct snd_soc_pcm_runtime *be = dpcm->be;
1292                 struct snd_pcm_substream *be_substream =
1293                         snd_soc_dpcm_get_substream(be, stream);
1294
1295                 /* is this op for this BE ? */
1296                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1297                         continue;
1298
1299                 /* only allow hw_params() if no connected FEs are running */
1300                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1301                         continue;
1302
1303                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1304                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1305                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1306                         continue;
1307
1308                 dev_dbg(be->dev, "dpcm: hw_params BE %s\n",
1309                         dpcm->fe->dai_link->name);
1310
1311                 /* copy params for each dpcm */
1312                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1313                                 sizeof(struct snd_pcm_hw_params));
1314
1315                 /* perform any hw_params fixups */
1316                 if (be->dai_link->be_hw_params_fixup) {
1317                         ret = be->dai_link->be_hw_params_fixup(be,
1318                                         &dpcm->hw_params);
1319                         if (ret < 0) {
1320                                 dev_err(be->dev,
1321                                         "dpcm: hw_params BE fixup failed %d\n",
1322                                         ret);
1323                                 goto unwind;
1324                         }
1325                 }
1326
1327                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1328                 if (ret < 0) {
1329                         dev_err(dpcm->be->dev,
1330                                 "dpcm: hw_params BE failed %d\n", ret);
1331                         goto unwind;
1332                 }
1333
1334                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1335         }
1336         return 0;
1337
1338 unwind:
1339         /* disable any enabled and non active backends */
1340         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1341                 struct snd_soc_pcm_runtime *be = dpcm->be;
1342                 struct snd_pcm_substream *be_substream =
1343                         snd_soc_dpcm_get_substream(be, stream);
1344
1345                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1346                         continue;
1347
1348                 /* only allow hw_free() if no connected FEs are running */
1349                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1350                         continue;
1351
1352                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1353                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1354                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1355                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1356                         continue;
1357
1358                 soc_pcm_hw_free(be_substream);
1359         }
1360
1361         return ret;
1362 }
1363
1364 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1365                                  struct snd_pcm_hw_params *params)
1366 {
1367         struct snd_soc_pcm_runtime *fe = substream->private_data;
1368         int ret, stream = substream->stream;
1369
1370         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1371         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1372
1373         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1374                         sizeof(struct snd_pcm_hw_params));
1375         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1376         if (ret < 0) {
1377                 dev_err(fe->dev,"dpcm: hw_params BE failed %d\n", ret);
1378                 goto out;
1379         }
1380
1381         dev_dbg(fe->dev, "dpcm: hw_params FE %s rate %d chan %x fmt %d\n",
1382                         fe->dai_link->name, params_rate(params),
1383                         params_channels(params), params_format(params));
1384
1385         /* call hw_params on the frontend */
1386         ret = soc_pcm_hw_params(substream, params);
1387         if (ret < 0) {
1388                 dev_err(fe->dev,"dpcm: hw_params FE failed %d\n", ret);
1389                 dpcm_be_dai_hw_free(fe, stream);
1390          } else
1391                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1392
1393 out:
1394         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1395         mutex_unlock(&fe->card->mutex);
1396         return ret;
1397 }
1398
1399 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1400                 struct snd_pcm_substream *substream, int cmd)
1401 {
1402         int ret;
1403
1404         dev_dbg(dpcm->be->dev, "dpcm: trigger BE %s cmd %d\n",
1405                         dpcm->fe->dai_link->name, cmd);
1406
1407         ret = soc_pcm_trigger(substream, cmd);
1408         if (ret < 0)
1409                 dev_err(dpcm->be->dev,"dpcm: trigger BE failed %d\n", ret);
1410
1411         return ret;
1412 }
1413
1414 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1415                                int cmd)
1416 {
1417         struct snd_soc_dpcm *dpcm;
1418         int ret = 0;
1419
1420         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1421
1422                 struct snd_soc_pcm_runtime *be = dpcm->be;
1423                 struct snd_pcm_substream *be_substream =
1424                         snd_soc_dpcm_get_substream(be, stream);
1425
1426                 /* is this op for this BE ? */
1427                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1428                         continue;
1429
1430                 switch (cmd) {
1431                 case SNDRV_PCM_TRIGGER_START:
1432                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1433                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1434                                 continue;
1435
1436                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1437                         if (ret)
1438                                 return ret;
1439
1440                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1441                         break;
1442                 case SNDRV_PCM_TRIGGER_RESUME:
1443                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1444                                 continue;
1445
1446                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1447                         if (ret)
1448                                 return ret;
1449
1450                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1451                         break;
1452                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1453                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1454                                 continue;
1455
1456                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1457                         if (ret)
1458                                 return ret;
1459
1460                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1461                         break;
1462                 case SNDRV_PCM_TRIGGER_STOP:
1463                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1464                                 continue;
1465
1466                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1467                                 continue;
1468
1469                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1470                         if (ret)
1471                                 return ret;
1472
1473                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1474                         break;
1475                 case SNDRV_PCM_TRIGGER_SUSPEND:
1476                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1477                                 continue;
1478
1479                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1480                                 continue;
1481
1482                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1483                         if (ret)
1484                                 return ret;
1485
1486                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1487                         break;
1488                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1489                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1490                                 continue;
1491
1492                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1493                                 continue;
1494
1495                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1496                         if (ret)
1497                                 return ret;
1498
1499                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1500                         break;
1501                 }
1502         }
1503
1504         return ret;
1505 }
1506 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1507
1508 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1509 {
1510         struct snd_soc_pcm_runtime *fe = substream->private_data;
1511         int stream = substream->stream, ret;
1512         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1513
1514         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1515
1516         switch (trigger) {
1517         case SND_SOC_DPCM_TRIGGER_PRE:
1518                 /* call trigger on the frontend before the backend. */
1519
1520                 dev_dbg(fe->dev, "dpcm: pre trigger FE %s cmd %d\n",
1521                                 fe->dai_link->name, cmd);
1522
1523                 ret = soc_pcm_trigger(substream, cmd);
1524                 if (ret < 0) {
1525                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1526                         goto out;
1527                 }
1528
1529                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1530                 break;
1531         case SND_SOC_DPCM_TRIGGER_POST:
1532                 /* call trigger on the frontend after the backend. */
1533
1534                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1535                 if (ret < 0) {
1536                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1537                         goto out;
1538                 }
1539
1540                 dev_dbg(fe->dev, "dpcm: post trigger FE %s cmd %d\n",
1541                                 fe->dai_link->name, cmd);
1542
1543                 ret = soc_pcm_trigger(substream, cmd);
1544                 break;
1545         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1546                 /* bespoke trigger() - handles both FE and BEs */
1547
1548                 dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd %d\n",
1549                                 fe->dai_link->name, cmd);
1550
1551                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1552                 if (ret < 0) {
1553                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1554                         goto out;
1555                 }
1556                 break;
1557         default:
1558                 dev_err(fe->dev, "dpcm: invalid trigger cmd %d for %s\n", cmd,
1559                                 fe->dai_link->name);
1560                 ret = -EINVAL;
1561                 goto out;
1562         }
1563
1564         switch (cmd) {
1565         case SNDRV_PCM_TRIGGER_START:
1566         case SNDRV_PCM_TRIGGER_RESUME:
1567         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1568                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1569                 break;
1570         case SNDRV_PCM_TRIGGER_STOP:
1571         case SNDRV_PCM_TRIGGER_SUSPEND:
1572         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1573                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1574                 break;
1575         }
1576
1577 out:
1578         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1579         return ret;
1580 }
1581
1582 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1583 {
1584         struct snd_soc_dpcm *dpcm;
1585         int ret = 0;
1586
1587         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1588
1589                 struct snd_soc_pcm_runtime *be = dpcm->be;
1590                 struct snd_pcm_substream *be_substream =
1591                         snd_soc_dpcm_get_substream(be, stream);
1592
1593                 /* is this op for this BE ? */
1594                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1595                         continue;
1596
1597                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1598                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1599                         continue;
1600
1601                 dev_dbg(be->dev, "dpcm: prepare BE %s\n",
1602                         dpcm->fe->dai_link->name);
1603
1604                 ret = soc_pcm_prepare(be_substream);
1605                 if (ret < 0) {
1606                         dev_err(be->dev, "dpcm: backend prepare failed %d\n",
1607                                 ret);
1608                         break;
1609                 }
1610
1611                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1612         }
1613         return ret;
1614 }
1615
1616 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1617 {
1618         struct snd_soc_pcm_runtime *fe = substream->private_data;
1619         int stream = substream->stream, ret = 0;
1620
1621         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1622
1623         dev_dbg(fe->dev, "dpcm: prepare FE %s\n", fe->dai_link->name);
1624
1625         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1626
1627         /* there is no point preparing this FE if there are no BEs */
1628         if (list_empty(&fe->dpcm[stream].be_clients)) {
1629                 dev_err(fe->dev, "dpcm: no backend DAIs enabled for %s\n",
1630                                 fe->dai_link->name);
1631                 ret = -EINVAL;
1632                 goto out;
1633         }
1634
1635         ret = dpcm_be_dai_prepare(fe, substream->stream);
1636         if (ret < 0)
1637                 goto out;
1638
1639         /* call prepare on the frontend */
1640         ret = soc_pcm_prepare(substream);
1641         if (ret < 0) {
1642                 dev_err(fe->dev,"dpcm: prepare FE %s failed\n",
1643                         fe->dai_link->name);
1644                 goto out;
1645         }
1646
1647         /* run the stream event for each BE */
1648         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1649         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1650
1651 out:
1652         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1653         mutex_unlock(&fe->card->mutex);
1654
1655         return ret;
1656 }
1657
1658 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1659                      unsigned int cmd, void *arg)
1660 {
1661         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1662         struct snd_soc_platform *platform = rtd->platform;
1663
1664         if (platform->driver->ops->ioctl)
1665                 return platform->driver->ops->ioctl(substream, cmd, arg);
1666         return snd_pcm_lib_ioctl(substream, cmd, arg);
1667 }
1668
1669 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1670 {
1671         struct snd_pcm_substream *substream =
1672                 snd_soc_dpcm_get_substream(fe, stream);
1673         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1674         int err;
1675
1676         dev_dbg(fe->dev, "runtime %s close on FE %s\n",
1677                         stream ? "capture" : "playback", fe->dai_link->name);
1678
1679         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1680                 /* call bespoke trigger - FE takes care of all BE triggers */
1681                 dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd stop\n",
1682                                 fe->dai_link->name);
1683
1684                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1685                 if (err < 0)
1686                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
1687         } else {
1688                 dev_dbg(fe->dev, "dpcm: trigger FE %s cmd stop\n",
1689                         fe->dai_link->name);
1690
1691                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1692                 if (err < 0)
1693                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
1694         }
1695
1696         err = dpcm_be_dai_hw_free(fe, stream);
1697         if (err < 0)
1698                 dev_err(fe->dev,"dpcm: hw_free FE failed %d\n", err);
1699
1700         err = dpcm_be_dai_shutdown(fe, stream);
1701         if (err < 0)
1702                 dev_err(fe->dev,"dpcm: shutdown FE failed %d\n", err);
1703
1704         /* run the stream event for each BE */
1705         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1706
1707         return 0;
1708 }
1709
1710 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1711 {
1712         struct snd_pcm_substream *substream =
1713                 snd_soc_dpcm_get_substream(fe, stream);
1714         struct snd_soc_dpcm *dpcm;
1715         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1716         int ret;
1717
1718         dev_dbg(fe->dev, "runtime %s open on FE %s\n",
1719                         stream ? "capture" : "playback", fe->dai_link->name);
1720
1721         /* Only start the BE if the FE is ready */
1722         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1723                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1724                 return -EINVAL;
1725
1726         /* startup must always be called for new BEs */
1727         ret = dpcm_be_dai_startup(fe, stream);
1728         if (ret < 0) {
1729                 goto disconnect;
1730                 return ret;
1731         }
1732
1733         /* keep going if FE state is > open */
1734         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1735                 return 0;
1736
1737         ret = dpcm_be_dai_hw_params(fe, stream);
1738         if (ret < 0) {
1739                 goto close;
1740                 return ret;
1741         }
1742
1743         /* keep going if FE state is > hw_params */
1744         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1745                 return 0;
1746
1747
1748         ret = dpcm_be_dai_prepare(fe, stream);
1749         if (ret < 0) {
1750                 goto hw_free;
1751                 return ret;
1752         }
1753
1754         /* run the stream event for each BE */
1755         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1756
1757         /* keep going if FE state is > prepare */
1758         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1759                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1760                 return 0;
1761
1762         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1763                 /* call trigger on the frontend - FE takes care of all BE triggers */
1764                 dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd start\n",
1765                                 fe->dai_link->name);
1766
1767                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1768                 if (ret < 0) {
1769                         dev_err(fe->dev,"dpcm: bespoke trigger FE failed %d\n", ret);
1770                         goto hw_free;
1771                 }
1772         } else {
1773                 dev_dbg(fe->dev, "dpcm: trigger FE %s cmd start\n",
1774                         fe->dai_link->name);
1775
1776                 ret = dpcm_be_dai_trigger(fe, stream,
1777                                         SNDRV_PCM_TRIGGER_START);
1778                 if (ret < 0) {
1779                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1780                         goto hw_free;
1781                 }
1782         }
1783
1784         return 0;
1785
1786 hw_free:
1787         dpcm_be_dai_hw_free(fe, stream);
1788 close:
1789         dpcm_be_dai_shutdown(fe, stream);
1790 disconnect:
1791         /* disconnect any non started BEs */
1792         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1793                 struct snd_soc_pcm_runtime *be = dpcm->be;
1794                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1795                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1796         }
1797
1798         return ret;
1799 }
1800
1801 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1802 {
1803         int ret;
1804
1805         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1806         ret = dpcm_run_update_startup(fe, stream);
1807         if (ret < 0)
1808                 dev_err(fe->dev, "failed to startup some BEs\n");
1809         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1810
1811         return ret;
1812 }
1813
1814 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1815 {
1816         int ret;
1817
1818         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1819         ret = dpcm_run_update_shutdown(fe, stream);
1820         if (ret < 0)
1821                 dev_err(fe->dev, "failed to shutdown some BEs\n");
1822         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1823
1824         return ret;
1825 }
1826
1827 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1828  * any DAI links.
1829  */
1830 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
1831 {
1832         struct snd_soc_card *card;
1833         int i, old, new, paths;
1834
1835         if (widget->codec)
1836                 card = widget->codec->card;
1837         else if (widget->platform)
1838                 card = widget->platform->card;
1839         else
1840                 return -EINVAL;
1841
1842         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1843         for (i = 0; i < card->num_rtd; i++) {
1844                 struct snd_soc_dapm_widget_list *list;
1845                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1846
1847                 /* make sure link is FE */
1848                 if (!fe->dai_link->dynamic)
1849                         continue;
1850
1851                 /* only check active links */
1852                 if (!fe->cpu_dai->active)
1853                         continue;
1854
1855                 /* DAPM sync will call this to update DSP paths */
1856                 dev_dbg(fe->dev, "DPCM runtime update for FE %s\n",
1857                         fe->dai_link->name);
1858
1859                 /* skip if FE doesn't have playback capability */
1860                 if (!fe->cpu_dai->driver->playback.channels_min)
1861                         goto capture;
1862
1863                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1864                 if (paths < 0) {
1865                         dev_warn(fe->dev, "%s no valid %s path\n",
1866                                         fe->dai_link->name,  "playback");
1867                         mutex_unlock(&card->mutex);
1868                         return paths;
1869                 }
1870
1871                 /* update any new playback paths */
1872                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1873                 if (new) {
1874                         dpcm_run_new_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                 /* update any old playback paths */
1880                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1881                 if (old) {
1882                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1883                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1884                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1885                 }
1886
1887 capture:
1888                 /* skip if FE doesn't have capture capability */
1889                 if (!fe->cpu_dai->driver->capture.channels_min)
1890                         continue;
1891
1892                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1893                 if (paths < 0) {
1894                         dev_warn(fe->dev, "%s no valid %s path\n",
1895                                         fe->dai_link->name,  "capture");
1896                         mutex_unlock(&card->mutex);
1897                         return paths;
1898                 }
1899
1900                 /* update any new capture paths */
1901                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1902                 if (new) {
1903                         dpcm_run_new_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                 /* update any old capture paths */
1909                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1910                 if (old) {
1911                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1912                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1913                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1914                 }
1915
1916                 dpcm_path_put(&list);
1917         }
1918
1919         mutex_unlock(&card->mutex);
1920         return 0;
1921 }
1922 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1923 {
1924         struct snd_soc_dpcm *dpcm;
1925         struct list_head *clients =
1926                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1927
1928         list_for_each_entry(dpcm, clients, list_be) {
1929
1930                 struct snd_soc_pcm_runtime *be = dpcm->be;
1931                 struct snd_soc_dai *dai = be->codec_dai;
1932                 struct snd_soc_dai_driver *drv = dai->driver;
1933
1934                 if (be->dai_link->ignore_suspend)
1935                         continue;
1936
1937                 dev_dbg(be->dev, "BE digital mute %s\n", be->dai_link->name);
1938
1939                 if (drv->ops->digital_mute && dai->playback_active)
1940                                 drv->ops->digital_mute(dai, mute);
1941         }
1942
1943         return 0;
1944 }
1945
1946 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1947 {
1948         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1949         struct snd_soc_dpcm *dpcm;
1950         struct snd_soc_dapm_widget_list *list;
1951         int ret;
1952         int stream = fe_substream->stream;
1953
1954         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1955         fe->dpcm[stream].runtime = fe_substream->runtime;
1956
1957         if (dpcm_path_get(fe, stream, &list) <= 0) {
1958                 dev_dbg(fe->dev, "asoc: %s no valid %s route\n",
1959                         fe->dai_link->name, stream ? "capture" : "playback");
1960         }
1961
1962         /* calculate valid and active FE <-> BE dpcms */
1963         dpcm_process_paths(fe, stream, &list, 1);
1964
1965         ret = dpcm_fe_dai_startup(fe_substream);
1966         if (ret < 0) {
1967                 /* clean up all links */
1968                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1969                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1970
1971                 dpcm_be_disconnect(fe, stream);
1972                 fe->dpcm[stream].runtime = NULL;
1973         }
1974
1975         dpcm_clear_pending_state(fe, stream);
1976         dpcm_path_put(&list);
1977         mutex_unlock(&fe->card->mutex);
1978         return ret;
1979 }
1980
1981 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1982 {
1983         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1984         struct snd_soc_dpcm *dpcm;
1985         int stream = fe_substream->stream, ret;
1986
1987         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1988         ret = dpcm_fe_dai_shutdown(fe_substream);
1989
1990         /* mark FE's links ready to prune */
1991         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1992                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1993
1994         dpcm_be_disconnect(fe, stream);
1995
1996         fe->dpcm[stream].runtime = NULL;
1997         mutex_unlock(&fe->card->mutex);
1998         return ret;
1999 }
2000
2001 /* create a new pcm */
2002 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2003 {
2004         struct snd_soc_platform *platform = rtd->platform;
2005         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2006         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2007         struct snd_pcm *pcm;
2008         char new_name[64];
2009         int ret = 0, playback = 0, capture = 0;
2010
2011         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2012                 if (cpu_dai->driver->playback.channels_min)
2013                         playback = 1;
2014                 if (cpu_dai->driver->capture.channels_min)
2015                         capture = 1;
2016         } else {
2017                 if (codec_dai->driver->playback.channels_min)
2018                         playback = 1;
2019                 if (codec_dai->driver->capture.channels_min)
2020                         capture = 1;
2021         }
2022
2023         /* create the PCM */
2024         if (rtd->dai_link->no_pcm) {
2025                 snprintf(new_name, sizeof(new_name), "(%s)",
2026                         rtd->dai_link->stream_name);
2027
2028                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2029                                 playback, capture, &pcm);
2030         } else {
2031                 if (rtd->dai_link->dynamic)
2032                         snprintf(new_name, sizeof(new_name), "%s (*)",
2033                                 rtd->dai_link->stream_name);
2034                 else
2035                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2036                                 rtd->dai_link->stream_name, codec_dai->name, num);
2037
2038                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2039                         capture, &pcm);
2040         }
2041         if (ret < 0) {
2042                 dev_err(rtd->card->dev, "can't create pcm for %s\n",
2043                         rtd->dai_link->name);
2044                 return ret;
2045         }
2046         dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num, new_name);
2047
2048         /* DAPM dai link stream work */
2049         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2050
2051         rtd->pcm = pcm;
2052         pcm->private_data = rtd;
2053
2054         if (rtd->dai_link->no_pcm) {
2055                 if (playback)
2056                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2057                 if (capture)
2058                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2059                 goto out;
2060         }
2061
2062         /* ASoC PCM operations */
2063         if (rtd->dai_link->dynamic) {
2064                 rtd->ops.open           = dpcm_fe_dai_open;
2065                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2066                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2067                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2068                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2069                 rtd->ops.close          = dpcm_fe_dai_close;
2070                 rtd->ops.pointer        = soc_pcm_pointer;
2071                 rtd->ops.ioctl          = soc_pcm_ioctl;
2072         } else {
2073                 rtd->ops.open           = soc_pcm_open;
2074                 rtd->ops.hw_params      = soc_pcm_hw_params;
2075                 rtd->ops.prepare        = soc_pcm_prepare;
2076                 rtd->ops.trigger        = soc_pcm_trigger;
2077                 rtd->ops.hw_free        = soc_pcm_hw_free;
2078                 rtd->ops.close          = soc_pcm_close;
2079                 rtd->ops.pointer        = soc_pcm_pointer;
2080                 rtd->ops.ioctl          = soc_pcm_ioctl;
2081         }
2082
2083         if (platform->driver->ops) {
2084                 rtd->ops.ack            = platform->driver->ops->ack;
2085                 rtd->ops.copy           = platform->driver->ops->copy;
2086                 rtd->ops.silence        = platform->driver->ops->silence;
2087                 rtd->ops.page           = platform->driver->ops->page;
2088                 rtd->ops.mmap           = platform->driver->ops->mmap;
2089         }
2090
2091         if (playback)
2092                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2093
2094         if (capture)
2095                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2096
2097         if (platform->driver->pcm_new) {
2098                 ret = platform->driver->pcm_new(rtd);
2099                 if (ret < 0) {
2100                         dev_err(platform->dev, "pcm constructor failed\n");
2101                         return ret;
2102                 }
2103         }
2104
2105         pcm->private_free = platform->driver->pcm_free;
2106 out:
2107         dev_info(rtd->card->dev, " %s <-> %s mapping ok\n", codec_dai->name,
2108                 cpu_dai->name);
2109         return ret;
2110 }
2111
2112 /* is the current PCM operation for this FE ? */
2113 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2114 {
2115         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2116                 return 1;
2117         return 0;
2118 }
2119 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2120
2121 /* is the current PCM operation for this BE ? */
2122 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2123                 struct snd_soc_pcm_runtime *be, int stream)
2124 {
2125         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2126            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2127                   be->dpcm[stream].runtime_update))
2128                 return 1;
2129         return 0;
2130 }
2131 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2132
2133 /* get the substream for this BE */
2134 struct snd_pcm_substream *
2135         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2136 {
2137         return be->pcm->streams[stream].substream;
2138 }
2139 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2140
2141 /* get the BE runtime state */
2142 enum snd_soc_dpcm_state
2143         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2144 {
2145         return be->dpcm[stream].state;
2146 }
2147 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2148
2149 /* set the BE runtime state */
2150 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2151                 int stream, enum snd_soc_dpcm_state state)
2152 {
2153         be->dpcm[stream].state = state;
2154 }
2155 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2156
2157 /*
2158  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2159  * are not running, paused or suspended for the specified stream direction.
2160  */
2161 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2162                 struct snd_soc_pcm_runtime *be, int stream)
2163 {
2164         struct snd_soc_dpcm *dpcm;
2165         int state;
2166
2167         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2168
2169                 if (dpcm->fe == fe)
2170                         continue;
2171
2172                 state = dpcm->fe->dpcm[stream].state;
2173                 if (state == SND_SOC_DPCM_STATE_START ||
2174                         state == SND_SOC_DPCM_STATE_PAUSED ||
2175                         state == SND_SOC_DPCM_STATE_SUSPEND)
2176                         return 0;
2177         }
2178
2179         /* it's safe to free/stop this BE DAI */
2180         return 1;
2181 }
2182 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2183
2184 /*
2185  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2186  * running, paused or suspended for the specified stream direction.
2187  */
2188 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2189                 struct snd_soc_pcm_runtime *be, int stream)
2190 {
2191         struct snd_soc_dpcm *dpcm;
2192         int state;
2193
2194         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2195
2196                 if (dpcm->fe == fe)
2197                         continue;
2198
2199                 state = dpcm->fe->dpcm[stream].state;
2200                 if (state == SND_SOC_DPCM_STATE_START ||
2201                         state == SND_SOC_DPCM_STATE_PAUSED ||
2202                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2203                         state == SND_SOC_DPCM_STATE_PREPARE)
2204                         return 0;
2205         }
2206
2207         /* it's safe to change hw_params */
2208         return 1;
2209 }
2210 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2211
2212 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2213                 int cmd, struct snd_soc_platform *platform)
2214 {
2215         if (platform->driver->ops->trigger)
2216                 return platform->driver->ops->trigger(substream, cmd);
2217         return 0;
2218 }
2219 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2220
2221 #ifdef CONFIG_DEBUG_FS
2222 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2223 {
2224         switch (state) {
2225         case SND_SOC_DPCM_STATE_NEW:
2226                 return "new";
2227         case SND_SOC_DPCM_STATE_OPEN:
2228                 return "open";
2229         case SND_SOC_DPCM_STATE_HW_PARAMS:
2230                 return "hw_params";
2231         case SND_SOC_DPCM_STATE_PREPARE:
2232                 return "prepare";
2233         case SND_SOC_DPCM_STATE_START:
2234                 return "start";
2235         case SND_SOC_DPCM_STATE_STOP:
2236                 return "stop";
2237         case SND_SOC_DPCM_STATE_SUSPEND:
2238                 return "suspend";
2239         case SND_SOC_DPCM_STATE_PAUSED:
2240                 return "paused";
2241         case SND_SOC_DPCM_STATE_HW_FREE:
2242                 return "hw_free";
2243         case SND_SOC_DPCM_STATE_CLOSE:
2244                 return "close";
2245         }
2246
2247         return "unknown";
2248 }
2249
2250 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2251                                 int stream, char *buf, size_t size)
2252 {
2253         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2254         struct snd_soc_dpcm *dpcm;
2255         ssize_t offset = 0;
2256
2257         /* FE state */
2258         offset += snprintf(buf + offset, size - offset,
2259                         "[%s - %s]\n", fe->dai_link->name,
2260                         stream ? "Capture" : "Playback");
2261
2262         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2263                         dpcm_state_string(fe->dpcm[stream].state));
2264
2265         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2266             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2267                 offset += snprintf(buf + offset, size - offset,
2268                                 "Hardware Params: "
2269                                 "Format = %s, Channels = %d, Rate = %d\n",
2270                                 snd_pcm_format_name(params_format(params)),
2271                                 params_channels(params),
2272                                 params_rate(params));
2273
2274         /* BEs state */
2275         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2276
2277         if (list_empty(&fe->dpcm[stream].be_clients)) {
2278                 offset += snprintf(buf + offset, size - offset,
2279                                 " No active DSP links\n");
2280                 goto out;
2281         }
2282
2283         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2284                 struct snd_soc_pcm_runtime *be = dpcm->be;
2285                 params = &dpcm->hw_params;
2286
2287                 offset += snprintf(buf + offset, size - offset,
2288                                 "- %s\n", be->dai_link->name);
2289
2290                 offset += snprintf(buf + offset, size - offset,
2291                                 "   State: %s\n",
2292                                 dpcm_state_string(be->dpcm[stream].state));
2293
2294                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2295                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2296                         offset += snprintf(buf + offset, size - offset,
2297                                 "   Hardware Params: "
2298                                 "Format = %s, Channels = %d, Rate = %d\n",
2299                                 snd_pcm_format_name(params_format(params)),
2300                                 params_channels(params),
2301                                 params_rate(params));
2302         }
2303
2304 out:
2305         return offset;
2306 }
2307
2308 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2309                                 size_t count, loff_t *ppos)
2310 {
2311         struct snd_soc_pcm_runtime *fe = file->private_data;
2312         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2313         char *buf;
2314
2315         buf = kmalloc(out_count, GFP_KERNEL);
2316         if (!buf)
2317                 return -ENOMEM;
2318
2319         if (fe->cpu_dai->driver->playback.channels_min)
2320                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2321                                         buf + offset, out_count - offset);
2322
2323         if (fe->cpu_dai->driver->capture.channels_min)
2324                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2325                                         buf + offset, out_count - offset);
2326
2327         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2328
2329         kfree(buf);
2330         return ret;
2331 }
2332
2333 static const struct file_operations dpcm_state_fops = {
2334         .open = simple_open,
2335         .read = dpcm_state_read_file,
2336         .llseek = default_llseek,
2337 };
2338
2339 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2340 {
2341         if (!rtd->dai_link)
2342                 return 0;
2343
2344         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2345                         rtd->card->debugfs_card_root);
2346         if (!rtd->debugfs_dpcm_root) {
2347                 dev_dbg(rtd->dev,
2348                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2349                          rtd->dai_link->name);
2350                 return -EINVAL;
2351         }
2352
2353         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2354                                                 rtd->debugfs_dpcm_root,
2355                                                 rtd, &dpcm_state_fops);
2356
2357         return 0;
2358 }
2359 #endif