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->cpu_dai->playback_widget == widget ||
 798                                 be->codec_dai->playback_widget == widget)
 799                                 return be;
 800                 }
 801         } else {
 802
 803                 for (i = 0; i < card->num_links; i++) {
 804                         be = &card->rtd[i];
 805
 806                         if (be->cpu_dai->capture_widget == widget ||
 807                                 be->codec_dai->capture_widget == widget)
 808                                 return be;
 809                 }
 810         }
 811
 812         dev_err(card->dev, "can't get %s BE for %s\n",
 813                 stream ? "capture" : "playback", widget->name);
 814         return NULL;
 815 }
 816
 817 static inline struct snd_soc_dapm_widget *
 818         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 819 {
 820         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 821                 return rtd->cpu_dai->playback_widget;
 822         else
 823                 return rtd->cpu_dai->capture_widget;
 824 }
 825
 826 static inline struct snd_soc_dapm_widget *
 827         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 828 {
 829         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 830                 return rtd->codec_dai->playback_widget;
 831         else
 832                 return rtd->codec_dai->capture_widget;
 833 }
 834
 835 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 836                 struct snd_soc_dapm_widget *widget)
 837 {
 838         int i;
 839
 840         for (i = 0; i < list->num_widgets; i++) {
 841                 if (widget == list->widgets[i])
 842                         return 1;
 843         }
 844
 845         return 0;
 846 }
 847
 848 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 849         int stream, struct snd_soc_dapm_widget_list **list_)
 850 {
 851         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
 852         struct snd_soc_dapm_widget_list *list;
 853         int paths;
 854
 855         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
 856                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
 857         if (list == NULL)
 858                 return -ENOMEM;
 859
 860         /* get number of valid DAI paths and their widgets */
 861         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
 862
 863         dev_dbg(fe->dev, "found %d audio %s paths\n", paths,
 864                         stream ? "capture" : "playback");
 865
 866         *list_ = list;
 867         return paths;
 868 }
 869
 870 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 871 {
 872         kfree(*list);
 873 }
 874
 875 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
 876         struct snd_soc_dapm_widget_list **list_)
 877 {
 878         struct snd_soc_dpcm *dpcm;
 879         struct snd_soc_dapm_widget_list *list = *list_;
 880         struct snd_soc_dapm_widget *widget;
 881         int prune = 0;
 882
 883         /* Destroy any old FE <--> BE connections */
 884         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 885
 886                 /* is there a valid CPU DAI widget for this BE */
 887                 widget = rtd_get_cpu_widget(dpcm->be, stream);
 888
 889                 /* prune the BE if it's no longer in our active list */
 890                 if (widget && widget_in_list(list, widget))
 891                         continue;
 892
 893                 /* is there a valid CODEC DAI widget for this BE */
 894                 widget = rtd_get_codec_widget(dpcm->be, stream);
 895
 896                 /* prune the BE if it's no longer in our active list */
 897                 if (widget && widget_in_list(list, widget))
 898                         continue;
 899
 900                 dev_dbg(fe->dev, "pruning %s BE %s for %s\n",
 901                         stream ? "capture" : "playback",
 902                         dpcm->be->dai_link->name, fe->dai_link->name);
 903                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 904                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 905                 prune++;
 906         }
 907
 908         dev_dbg(fe->dev, "found %d old BE paths for pruning\n", prune);
 909         return prune;
 910 }
 911
 912 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
 913         struct snd_soc_dapm_widget_list **list_)
 914 {
 915         struct snd_soc_card *card = fe->card;
 916         struct snd_soc_dapm_widget_list *list = *list_;
 917         struct snd_soc_pcm_runtime *be;
 918         int i, new = 0, err;
 919
 920         /* Create any new FE <--> BE connections */
 921         for (i = 0; i < list->num_widgets; i++) {
 922
 923                 if (list->widgets[i]->id != snd_soc_dapm_dai)
 924                         continue;
 925
 926                 /* is there a valid BE rtd for this widget */
 927                 be = dpcm_get_be(card, list->widgets[i], stream);
 928                 if (!be) {
 929                         dev_err(fe->dev, "no BE found for %s\n",
 930                                         list->widgets[i]->name);
 931                         continue;
 932                 }
 933
 934                 /* make sure BE is a real BE */
 935                 if (!be->dai_link->no_pcm)
 936                         continue;
 937
 938                 /* don't connect if FE is not running */
 939                 if (!fe->dpcm[stream].runtime)
 940                         continue;
 941
 942                 /* newly connected FE and BE */
 943                 err = dpcm_be_connect(fe, be, stream);
 944                 if (err < 0) {
 945                         dev_err(fe->dev, "can't connect %s\n",
 946                                 list->widgets[i]->name);
 947                         break;
 948                 } else if (err == 0) /* already connected */
 949                         continue;
 950
 951                 /* new */
 952                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 953                 new++;
 954         }
 955
 956         dev_dbg(fe->dev, "found %d new BE paths\n", new);
 957         return new;
 958 }
 959
 960 /*
 961  * Find the corresponding BE DAIs that source or sink audio to this
 962  * FE substream.
 963  */
 964 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 965         int stream, struct snd_soc_dapm_widget_list **list, int new)
 966 {
 967         if (new)
 968                 return dpcm_add_paths(fe, stream, list);
 969         else
 970                 return dpcm_prune_paths(fe, stream, list);
 971 }
 972
 973 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
 974 {
 975         struct snd_soc_dpcm *dpcm;
 976
 977         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
 978                 dpcm->be->dpcm[stream].runtime_update =
 979                                                 SND_SOC_DPCM_UPDATE_NO;
 980 }
 981
 982 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
 983         int stream)
 984 {
 985         struct snd_soc_dpcm *dpcm;
 986
 987         /* disable any enabled and non active backends */
 988         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 989
 990                 struct snd_soc_pcm_runtime *be = dpcm->be;
 991                 struct snd_pcm_substream *be_substream =
 992                         snd_soc_dpcm_get_substream(be, stream);
 993
 994                 if (be->dpcm[stream].users == 0)
 995                         dev_err(be->dev, "no users %s at close - state %d\n",
 996                                 stream ? "capture" : "playback",
 997                                 be->dpcm[stream].state);
 998
 999                 if (--be->dpcm[stream].users != 0)
1000                         continue;
1001
1002                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1003                         continue;
1004
1005                 soc_pcm_close(be_substream);
1006                 be_substream->runtime = NULL;
1007                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1008         }
1009 }
1010
1011 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1012 {
1013         struct snd_soc_dpcm *dpcm;
1014         int err, count = 0;
1015
1016         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1017         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1018
1019                 struct snd_soc_pcm_runtime *be = dpcm->be;
1020                 struct snd_pcm_substream *be_substream =
1021                         snd_soc_dpcm_get_substream(be, stream);
1022
1023                 /* is this op for this BE ? */
1024                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1025                         continue;
1026
1027                 /* first time the dpcm is open ? */
1028                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1029                         dev_err(be->dev, "too many users %s at open %d\n",
1030                                 stream ? "capture" : "playback",
1031                                 be->dpcm[stream].state);
1032
1033                 if (be->dpcm[stream].users++ != 0)
1034                         continue;
1035
1036                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1037                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1038                         continue;
1039
1040                 dev_dbg(be->dev, "dpcm: open BE %s\n", be->dai_link->name);
1041
1042                 be_substream->runtime = be->dpcm[stream].runtime;
1043                 err = soc_pcm_open(be_substream);
1044                 if (err < 0) {
1045                         dev_err(be->dev, "BE open failed %d\n", err);
1046                         be->dpcm[stream].users--;
1047                         if (be->dpcm[stream].users < 0)
1048                                 dev_err(be->dev, "no users %s at unwind %d\n",
1049                                         stream ? "capture" : "playback",
1050                                         be->dpcm[stream].state);
1051
1052                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1053                         goto unwind;
1054                 }
1055
1056                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1057                 count++;
1058         }
1059
1060         return count;
1061
1062 unwind:
1063         /* disable any enabled and non active backends */
1064         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1065                 struct snd_soc_pcm_runtime *be = dpcm->be;
1066                 struct snd_pcm_substream *be_substream =
1067                         snd_soc_dpcm_get_substream(be, stream);
1068
1069                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1070                         continue;
1071
1072                 if (be->dpcm[stream].users == 0)
1073                         dev_err(be->dev, "no users %s at close %d\n",
1074                                 stream ? "capture" : "playback",
1075                                 be->dpcm[stream].state);
1076
1077                 if (--be->dpcm[stream].users != 0)
1078                         continue;
1079
1080                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1081                         continue;
1082
1083                 soc_pcm_close(be_substream);
1084                 be_substream->runtime = NULL;
1085                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1086         }
1087
1088         return err;
1089 }
1090
1091 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1092 {
1093         struct snd_pcm_runtime *runtime = substream->runtime;
1094         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1095         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1096         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1097
1098         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1099                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1100                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1101                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1102                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1103                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1104                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1105         } else {
1106                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1107                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1108                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1109                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1110                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1111                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1112         }
1113 }
1114
1115 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1116 {
1117         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1118         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1119         int stream = fe_substream->stream, ret = 0;
1120
1121         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1122
1123         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1124         if (ret < 0) {
1125                 dev_err(fe->dev,"dpcm: failed to start some BEs %d\n", ret);
1126                 goto be_err;
1127         }
1128
1129         dev_dbg(fe->dev, "dpcm: open FE %s\n", fe->dai_link->name);
1130
1131         /* start the DAI frontend */
1132         ret = soc_pcm_open(fe_substream);
1133         if (ret < 0) {
1134                 dev_err(fe->dev,"dpcm: failed to start FE %d\n", ret);
1135                 goto unwind;
1136         }
1137
1138         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1139
1140         dpcm_set_fe_runtime(fe_substream);
1141         snd_pcm_limit_hw_rates(runtime);
1142
1143         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1144         return 0;
1145
1146 unwind:
1147         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1148 be_err:
1149         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1150         return ret;
1151 }
1152
1153 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1154 {
1155         struct snd_soc_dpcm *dpcm;
1156
1157         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1158         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1159
1160                 struct snd_soc_pcm_runtime *be = dpcm->be;
1161                 struct snd_pcm_substream *be_substream =
1162                         snd_soc_dpcm_get_substream(be, stream);
1163
1164                 /* is this op for this BE ? */
1165                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1166                         continue;
1167
1168                 if (be->dpcm[stream].users == 0)
1169                         dev_err(be->dev, "no users %s at close - state %d\n",
1170                                 stream ? "capture" : "playback",
1171                                 be->dpcm[stream].state);
1172
1173                 if (--be->dpcm[stream].users != 0)
1174                         continue;
1175
1176                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1177                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1178                         continue;
1179
1180                 dev_dbg(be->dev, "dpcm: close BE %s\n",
1181                         dpcm->fe->dai_link->name);
1182
1183                 soc_pcm_close(be_substream);
1184                 be_substream->runtime = NULL;
1185
1186                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1187         }
1188         return 0;
1189 }
1190
1191 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1192 {
1193         struct snd_soc_pcm_runtime *fe = substream->private_data;
1194         int stream = substream->stream;
1195
1196         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1197
1198         /* shutdown the BEs */
1199         dpcm_be_dai_shutdown(fe, substream->stream);
1200
1201         dev_dbg(fe->dev, "dpcm: close FE %s\n", fe->dai_link->name);
1202
1203         /* now shutdown the frontend */
1204         soc_pcm_close(substream);
1205
1206         /* run the stream event for each BE */
1207         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1208
1209         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1210         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1211         return 0;
1212 }
1213
1214 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1215 {
1216         struct snd_soc_dpcm *dpcm;
1217
1218         /* only hw_params backends that are either sinks or sources
1219          * to this frontend DAI */
1220         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1221
1222                 struct snd_soc_pcm_runtime *be = dpcm->be;
1223                 struct snd_pcm_substream *be_substream =
1224                         snd_soc_dpcm_get_substream(be, stream);
1225
1226                 /* is this op for this BE ? */
1227                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1228                         continue;
1229
1230                 /* only free hw when no longer used - check all FEs */
1231                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1232                                 continue;
1233
1234                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1235                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1236                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1237                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1238                         continue;
1239
1240                 dev_dbg(be->dev, "dpcm: hw_free BE %s\n",
1241                         dpcm->fe->dai_link->name);
1242
1243                 soc_pcm_hw_free(be_substream);
1244
1245                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1246         }
1247
1248         return 0;
1249 }
1250
1251 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1252 {
1253         struct snd_soc_pcm_runtime *fe = substream->private_data;
1254         int err, stream = substream->stream;
1255
1256         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1257         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1258
1259         dev_dbg(fe->dev, "dpcm: hw_free FE %s\n", fe->dai_link->name);
1260
1261         /* call hw_free on the frontend */
1262         err = soc_pcm_hw_free(substream);
1263         if (err < 0)
1264                 dev_err(fe->dev,"dpcm: hw_free FE %s failed\n",
1265                         fe->dai_link->name);
1266
1267         /* only hw_params backends that are either sinks or sources
1268          * to this frontend DAI */
1269         err = dpcm_be_dai_hw_free(fe, stream);
1270
1271         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1272         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1273
1274         mutex_unlock(&fe->card->mutex);
1275         return 0;
1276 }
1277
1278 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1279 {
1280         struct snd_soc_dpcm *dpcm;
1281         int ret;
1282
1283         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1284
1285                 struct snd_soc_pcm_runtime *be = dpcm->be;
1286                 struct snd_pcm_substream *be_substream =
1287                         snd_soc_dpcm_get_substream(be, stream);
1288
1289                 /* is this op for this BE ? */
1290                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1291                         continue;
1292
1293                 /* only allow hw_params() if no connected FEs are running */
1294                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1295                         continue;
1296
1297                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1298                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1299                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1300                         continue;
1301
1302                 dev_dbg(be->dev, "dpcm: hw_params BE %s\n",
1303                         dpcm->fe->dai_link->name);
1304
1305                 /* copy params for each dpcm */
1306                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1307                                 sizeof(struct snd_pcm_hw_params));
1308
1309                 /* perform any hw_params fixups */
1310                 if (be->dai_link->be_hw_params_fixup) {
1311                         ret = be->dai_link->be_hw_params_fixup(be,
1312                                         &dpcm->hw_params);
1313                         if (ret < 0) {
1314                                 dev_err(be->dev,
1315                                         "dpcm: hw_params BE fixup failed %d\n",
1316                                         ret);
1317                                 goto unwind;
1318                         }
1319                 }
1320
1321                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1322                 if (ret < 0) {
1323                         dev_err(dpcm->be->dev,
1324                                 "dpcm: hw_params BE failed %d\n", ret);
1325                         goto unwind;
1326                 }
1327
1328                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1329         }
1330         return 0;
1331
1332 unwind:
1333         /* disable any enabled and non active backends */
1334         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1335                 struct snd_soc_pcm_runtime *be = dpcm->be;
1336                 struct snd_pcm_substream *be_substream =
1337                         snd_soc_dpcm_get_substream(be, stream);
1338
1339                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1340                         continue;
1341
1342                 /* only allow hw_free() if no connected FEs are running */
1343                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1344                         continue;
1345
1346                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1347                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1348                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1349                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1350                         continue;
1351
1352                 soc_pcm_hw_free(be_substream);
1353         }
1354
1355         return ret;
1356 }
1357
1358 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1359                                  struct snd_pcm_hw_params *params)
1360 {
1361         struct snd_soc_pcm_runtime *fe = substream->private_data;
1362         int ret, stream = substream->stream;
1363
1364         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1365         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1366
1367         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1368                         sizeof(struct snd_pcm_hw_params));
1369         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1370         if (ret < 0) {
1371                 dev_err(fe->dev,"dpcm: hw_params BE failed %d\n", ret);
1372                 goto out;
1373         }
1374
1375         dev_dbg(fe->dev, "dpcm: hw_params FE %s rate %d chan %x fmt %d\n",
1376                         fe->dai_link->name, params_rate(params),
1377                         params_channels(params), params_format(params));
1378
1379         /* call hw_params on the frontend */
1380         ret = soc_pcm_hw_params(substream, params);
1381         if (ret < 0) {
1382                 dev_err(fe->dev,"dpcm: hw_params FE failed %d\n", ret);
1383                 dpcm_be_dai_hw_free(fe, stream);
1384          } else
1385                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1386
1387 out:
1388         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1389         mutex_unlock(&fe->card->mutex);
1390         return ret;
1391 }
1392
1393 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1394                 struct snd_pcm_substream *substream, int cmd)
1395 {
1396         int ret;
1397
1398         dev_dbg(dpcm->be->dev, "dpcm: trigger BE %s cmd %d\n",
1399                         dpcm->fe->dai_link->name, cmd);
1400
1401         ret = soc_pcm_trigger(substream, cmd);
1402         if (ret < 0)
1403                 dev_err(dpcm->be->dev,"dpcm: trigger BE failed %d\n", ret);
1404
1405         return ret;
1406 }
1407
1408 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1409                                int cmd)
1410 {
1411         struct snd_soc_dpcm *dpcm;
1412         int ret = 0;
1413
1414         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1415
1416                 struct snd_soc_pcm_runtime *be = dpcm->be;
1417                 struct snd_pcm_substream *be_substream =
1418                         snd_soc_dpcm_get_substream(be, stream);
1419
1420                 /* is this op for this BE ? */
1421                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1422                         continue;
1423
1424                 switch (cmd) {
1425                 case SNDRV_PCM_TRIGGER_START:
1426                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1427                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1428                                 continue;
1429
1430                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1431                         if (ret)
1432                                 return ret;
1433
1434                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1435                         break;
1436                 case SNDRV_PCM_TRIGGER_RESUME:
1437                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1438                                 continue;
1439
1440                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1441                         if (ret)
1442                                 return ret;
1443
1444                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1445                         break;
1446                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1447                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1448                                 continue;
1449
1450                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1451                         if (ret)
1452                                 return ret;
1453
1454                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1455                         break;
1456                 case SNDRV_PCM_TRIGGER_STOP:
1457                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1458                                 continue;
1459
1460                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1461                                 continue;
1462
1463                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1464                         if (ret)
1465                                 return ret;
1466
1467                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1468                         break;
1469                 case SNDRV_PCM_TRIGGER_SUSPEND:
1470                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1471                                 continue;
1472
1473                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1474                                 continue;
1475
1476                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1477                         if (ret)
1478                                 return ret;
1479
1480                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1481                         break;
1482                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1483                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1484                                 continue;
1485
1486                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1487                                 continue;
1488
1489                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1490                         if (ret)
1491                                 return ret;
1492
1493                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1494                         break;
1495                 }
1496         }
1497
1498         return ret;
1499 }
1500 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1501
1502 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1503 {
1504         struct snd_soc_pcm_runtime *fe = substream->private_data;
1505         int stream = substream->stream, ret;
1506         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1507
1508         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1509
1510         switch (trigger) {
1511         case SND_SOC_DPCM_TRIGGER_PRE:
1512                 /* call trigger on the frontend before the backend. */
1513
1514                 dev_dbg(fe->dev, "dpcm: pre trigger FE %s cmd %d\n",
1515                                 fe->dai_link->name, cmd);
1516
1517                 ret = soc_pcm_trigger(substream, cmd);
1518                 if (ret < 0) {
1519                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1520                         goto out;
1521                 }
1522
1523                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1524                 break;
1525         case SND_SOC_DPCM_TRIGGER_POST:
1526                 /* call trigger on the frontend after the backend. */
1527
1528                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1529                 if (ret < 0) {
1530                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1531                         goto out;
1532                 }
1533
1534                 dev_dbg(fe->dev, "dpcm: post trigger FE %s cmd %d\n",
1535                                 fe->dai_link->name, cmd);
1536
1537                 ret = soc_pcm_trigger(substream, cmd);
1538                 break;
1539         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1540                 /* bespoke trigger() - handles both FE and BEs */
1541
1542                 dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd %d\n",
1543                                 fe->dai_link->name, cmd);
1544
1545                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1546                 if (ret < 0) {
1547                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1548                         goto out;
1549                 }
1550                 break;
1551         default:
1552                 dev_err(fe->dev, "dpcm: invalid trigger cmd %d for %s\n", cmd,
1553                                 fe->dai_link->name);
1554                 ret = -EINVAL;
1555                 goto out;
1556         }
1557
1558         switch (cmd) {
1559         case SNDRV_PCM_TRIGGER_START:
1560         case SNDRV_PCM_TRIGGER_RESUME:
1561         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1562                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1563                 break;
1564         case SNDRV_PCM_TRIGGER_STOP:
1565         case SNDRV_PCM_TRIGGER_SUSPEND:
1566         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1567                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1568                 break;
1569         }
1570
1571 out:
1572         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1573         return ret;
1574 }
1575
1576 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1577 {
1578         struct snd_soc_dpcm *dpcm;
1579         int ret = 0;
1580
1581         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1582
1583                 struct snd_soc_pcm_runtime *be = dpcm->be;
1584                 struct snd_pcm_substream *be_substream =
1585                         snd_soc_dpcm_get_substream(be, stream);
1586
1587                 /* is this op for this BE ? */
1588                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1589                         continue;
1590
1591                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1592                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1593                         continue;
1594
1595                 dev_dbg(be->dev, "dpcm: prepare BE %s\n",
1596                         dpcm->fe->dai_link->name);
1597
1598                 ret = soc_pcm_prepare(be_substream);
1599                 if (ret < 0) {
1600                         dev_err(be->dev, "dpcm: backend prepare failed %d\n",
1601                                 ret);
1602                         break;
1603                 }
1604
1605                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1606         }
1607         return ret;
1608 }
1609
1610 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1611 {
1612         struct snd_soc_pcm_runtime *fe = substream->private_data;
1613         int stream = substream->stream, ret = 0;
1614
1615         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1616
1617         dev_dbg(fe->dev, "dpcm: prepare FE %s\n", fe->dai_link->name);
1618
1619         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1620
1621         /* there is no point preparing this FE if there are no BEs */
1622         if (list_empty(&fe->dpcm[stream].be_clients)) {
1623                 dev_err(fe->dev, "dpcm: no backend DAIs enabled for %s\n",
1624                                 fe->dai_link->name);
1625                 ret = -EINVAL;
1626                 goto out;
1627         }
1628
1629         ret = dpcm_be_dai_prepare(fe, substream->stream);
1630         if (ret < 0)
1631                 goto out;
1632
1633         /* call prepare on the frontend */
1634         ret = soc_pcm_prepare(substream);
1635         if (ret < 0) {
1636                 dev_err(fe->dev,"dpcm: prepare FE %s failed\n",
1637                         fe->dai_link->name);
1638                 goto out;
1639         }
1640
1641         /* run the stream event for each BE */
1642         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1643         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1644
1645 out:
1646         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1647         mutex_unlock(&fe->card->mutex);
1648
1649         return ret;
1650 }
1651
1652 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1653                      unsigned int cmd, void *arg)
1654 {
1655         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1656         struct snd_soc_platform *platform = rtd->platform;
1657
1658         if (platform->driver->ops->ioctl)
1659                 return platform->driver->ops->ioctl(substream, cmd, arg);
1660         return snd_pcm_lib_ioctl(substream, cmd, arg);
1661 }
1662
1663 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1664 {
1665         struct snd_pcm_substream *substream =
1666                 snd_soc_dpcm_get_substream(fe, stream);
1667         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1668         int err;
1669
1670         dev_dbg(fe->dev, "runtime %s close on FE %s\n",
1671                         stream ? "capture" : "playback", fe->dai_link->name);
1672
1673         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1674                 /* call bespoke trigger - FE takes care of all BE triggers */
1675                 dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd stop\n",
1676                                 fe->dai_link->name);
1677
1678                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1679                 if (err < 0)
1680                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
1681         } else {
1682                 dev_dbg(fe->dev, "dpcm: trigger FE %s cmd stop\n",
1683                         fe->dai_link->name);
1684
1685                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1686                 if (err < 0)
1687                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
1688         }
1689
1690         err = dpcm_be_dai_hw_free(fe, stream);
1691         if (err < 0)
1692                 dev_err(fe->dev,"dpcm: hw_free FE failed %d\n", err);
1693
1694         err = dpcm_be_dai_shutdown(fe, stream);
1695         if (err < 0)
1696                 dev_err(fe->dev,"dpcm: shutdown FE failed %d\n", err);
1697
1698         /* run the stream event for each BE */
1699         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1700
1701         return 0;
1702 }
1703
1704 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1705 {
1706         struct snd_pcm_substream *substream =
1707                 snd_soc_dpcm_get_substream(fe, stream);
1708         struct snd_soc_dpcm *dpcm;
1709         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1710         int ret;
1711
1712         dev_dbg(fe->dev, "runtime %s open on FE %s\n",
1713                         stream ? "capture" : "playback", fe->dai_link->name);
1714
1715         /* Only start the BE if the FE is ready */
1716         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1717                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1718                 return -EINVAL;
1719
1720         /* startup must always be called for new BEs */
1721         ret = dpcm_be_dai_startup(fe, stream);
1722         if (ret < 0) {
1723                 goto disconnect;
1724                 return ret;
1725         }
1726
1727         /* keep going if FE state is > open */
1728         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1729                 return 0;
1730
1731         ret = dpcm_be_dai_hw_params(fe, stream);
1732         if (ret < 0) {
1733                 goto close;
1734                 return ret;
1735         }
1736
1737         /* keep going if FE state is > hw_params */
1738         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1739                 return 0;
1740
1741
1742         ret = dpcm_be_dai_prepare(fe, stream);
1743         if (ret < 0) {
1744                 goto hw_free;
1745                 return ret;
1746         }
1747
1748         /* run the stream event for each BE */
1749         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1750
1751         /* keep going if FE state is > prepare */
1752         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1753                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1754                 return 0;
1755
1756         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1757                 /* call trigger on the frontend - FE takes care of all BE triggers */
1758                 dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd start\n",
1759                                 fe->dai_link->name);
1760
1761                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1762                 if (ret < 0) {
1763                         dev_err(fe->dev,"dpcm: bespoke trigger FE failed %d\n", ret);
1764                         goto hw_free;
1765                 }
1766         } else {
1767                 dev_dbg(fe->dev, "dpcm: trigger FE %s cmd start\n",
1768                         fe->dai_link->name);
1769
1770                 ret = dpcm_be_dai_trigger(fe, stream,
1771                                         SNDRV_PCM_TRIGGER_START);
1772                 if (ret < 0) {
1773                         dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1774                         goto hw_free;
1775                 }
1776         }
1777
1778         return 0;
1779
1780 hw_free:
1781         dpcm_be_dai_hw_free(fe, stream);
1782 close:
1783         dpcm_be_dai_shutdown(fe, stream);
1784 disconnect:
1785         /* disconnect any non started BEs */
1786         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1787                 struct snd_soc_pcm_runtime *be = dpcm->be;
1788                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1789                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1790         }
1791
1792         return ret;
1793 }
1794
1795 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1796 {
1797         int ret;
1798
1799         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1800         ret = dpcm_run_update_startup(fe, stream);
1801         if (ret < 0)
1802                 dev_err(fe->dev, "failed to startup some BEs\n");
1803         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1804
1805         return ret;
1806 }
1807
1808 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1809 {
1810         int ret;
1811
1812         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1813         ret = dpcm_run_update_shutdown(fe, stream);
1814         if (ret < 0)
1815                 dev_err(fe->dev, "failed to shutdown some BEs\n");
1816         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1817
1818         return ret;
1819 }
1820
1821 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1822  * any DAI links.
1823  */
1824 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
1825 {
1826         struct snd_soc_card *card;
1827         int i, old, new, paths;
1828
1829         if (widget->codec)
1830                 card = widget->codec->card;
1831         else if (widget->platform)
1832                 card = widget->platform->card;
1833         else
1834                 return -EINVAL;
1835
1836         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1837         for (i = 0; i < card->num_rtd; i++) {
1838                 struct snd_soc_dapm_widget_list *list;
1839                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1840
1841                 /* make sure link is FE */
1842                 if (!fe->dai_link->dynamic)
1843                         continue;
1844
1845                 /* only check active links */
1846                 if (!fe->cpu_dai->active)
1847                         continue;
1848
1849                 /* DAPM sync will call this to update DSP paths */
1850                 dev_dbg(fe->dev, "DPCM runtime update for FE %s\n",
1851                         fe->dai_link->name);
1852
1853                 /* skip if FE doesn't have playback capability */
1854                 if (!fe->cpu_dai->driver->playback.channels_min)
1855                         goto capture;
1856
1857                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1858                 if (paths < 0) {
1859                         dev_warn(fe->dev, "%s no valid %s path\n",
1860                                         fe->dai_link->name,  "playback");
1861                         mutex_unlock(&card->mutex);
1862                         return paths;
1863                 }
1864
1865                 /* update any new playback paths */
1866                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1867                 if (new) {
1868                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1869                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1870                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1871                 }
1872
1873                 /* update any old playback paths */
1874                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1875                 if (old) {
1876                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1877                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1878                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1879                 }
1880
1881 capture:
1882                 /* skip if FE doesn't have capture capability */
1883                 if (!fe->cpu_dai->driver->capture.channels_min)
1884                         continue;
1885
1886                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1887                 if (paths < 0) {
1888                         dev_warn(fe->dev, "%s no valid %s path\n",
1889                                         fe->dai_link->name,  "capture");
1890                         mutex_unlock(&card->mutex);
1891                         return paths;
1892                 }
1893
1894                 /* update any new capture paths */
1895                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1896                 if (new) {
1897                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1898                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1899                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1900                 }
1901
1902                 /* update any old capture paths */
1903                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1904                 if (old) {
1905                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1906                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1907                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1908                 }
1909
1910                 dpcm_path_put(&list);
1911         }
1912
1913         mutex_unlock(&card->mutex);
1914         return 0;
1915 }
1916 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1917 {
1918         struct snd_soc_dpcm *dpcm;
1919         struct list_head *clients =
1920                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1921
1922         list_for_each_entry(dpcm, clients, list_be) {
1923
1924                 struct snd_soc_pcm_runtime *be = dpcm->be;
1925                 struct snd_soc_dai *dai = be->codec_dai;
1926                 struct snd_soc_dai_driver *drv = dai->driver;
1927
1928                 if (be->dai_link->ignore_suspend)
1929                         continue;
1930
1931                 dev_dbg(be->dev, "BE digital mute %s\n", be->dai_link->name);
1932
1933                 if (drv->ops->digital_mute && dai->playback_active)
1934                                 drv->ops->digital_mute(dai, mute);
1935         }
1936
1937         return 0;
1938 }
1939
1940 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1941 {
1942         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1943         struct snd_soc_dpcm *dpcm;
1944         struct snd_soc_dapm_widget_list *list;
1945         int ret;
1946         int stream = fe_substream->stream;
1947
1948         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1949         fe->dpcm[stream].runtime = fe_substream->runtime;
1950
1951         if (dpcm_path_get(fe, stream, &list) <= 0) {
1952                 dev_warn(fe->dev, "asoc: %s no valid %s route\n",
1953                         fe->dai_link->name, stream ? "capture" : "playback");
1954                         mutex_unlock(&fe->card->mutex);
1955                         return -EINVAL;
1956         }
1957
1958         /* calculate valid and active FE <-> BE dpcms */
1959         dpcm_process_paths(fe, stream, &list, 1);
1960
1961         ret = dpcm_fe_dai_startup(fe_substream);
1962         if (ret < 0) {
1963                 /* clean up all links */
1964                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1965                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1966
1967                 dpcm_be_disconnect(fe, stream);
1968                 fe->dpcm[stream].runtime = NULL;
1969         }
1970
1971         dpcm_clear_pending_state(fe, stream);
1972         dpcm_path_put(&list);
1973         mutex_unlock(&fe->card->mutex);
1974         return ret;
1975 }
1976
1977 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1978 {
1979         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1980         struct snd_soc_dpcm *dpcm;
1981         int stream = fe_substream->stream, ret;
1982
1983         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1984         ret = dpcm_fe_dai_shutdown(fe_substream);
1985
1986         /* mark FE's links ready to prune */
1987         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1988                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1989
1990         dpcm_be_disconnect(fe, stream);
1991
1992         fe->dpcm[stream].runtime = NULL;
1993         mutex_unlock(&fe->card->mutex);
1994         return ret;
1995 }
1996
1997 /* create a new pcm */
1998 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
1999 {
2000         struct snd_soc_codec *codec = rtd->codec;
2001         struct snd_soc_platform *platform = rtd->platform;
2002         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2003         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2004         struct snd_pcm *pcm;
2005         char new_name[64];
2006         int ret = 0, playback = 0, capture = 0;
2007
2008         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2009                 if (cpu_dai->driver->playback.channels_min)
2010                         playback = 1;
2011                 if (cpu_dai->driver->capture.channels_min)
2012                         capture = 1;
2013         } else {
2014                 if (codec_dai->driver->playback.channels_min)
2015                         playback = 1;
2016                 if (codec_dai->driver->capture.channels_min)
2017                         capture = 1;
2018         }
2019
2020         /* create the PCM */
2021         if (rtd->dai_link->no_pcm) {
2022                 snprintf(new_name, sizeof(new_name), "(%s)",
2023                         rtd->dai_link->stream_name);
2024
2025                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2026                                 playback, capture, &pcm);
2027         } else {
2028                 if (rtd->dai_link->dynamic)
2029                         snprintf(new_name, sizeof(new_name), "%s (*)",
2030                                 rtd->dai_link->stream_name);
2031                 else
2032                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2033                                 rtd->dai_link->stream_name, codec_dai->name, num);
2034
2035                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2036                         capture, &pcm);
2037         }
2038         if (ret < 0) {
2039                 printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
2040                 return ret;
2041         }
2042         dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num, new_name);
2043
2044         /* DAPM dai link stream work */
2045         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2046
2047         rtd->pcm = pcm;
2048         pcm->private_data = rtd;
2049
2050         if (rtd->dai_link->no_pcm) {
2051                 if (playback)
2052                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2053                 if (capture)
2054                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2055                 goto out;
2056         }
2057
2058         /* ASoC PCM operations */
2059         if (rtd->dai_link->dynamic) {
2060                 rtd->ops.open           = dpcm_fe_dai_open;
2061                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2062                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2063                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2064                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2065                 rtd->ops.close          = dpcm_fe_dai_close;
2066                 rtd->ops.pointer        = soc_pcm_pointer;
2067                 rtd->ops.ioctl          = soc_pcm_ioctl;
2068         } else {
2069                 rtd->ops.open           = soc_pcm_open;
2070                 rtd->ops.hw_params      = soc_pcm_hw_params;
2071                 rtd->ops.prepare        = soc_pcm_prepare;
2072                 rtd->ops.trigger        = soc_pcm_trigger;
2073                 rtd->ops.hw_free        = soc_pcm_hw_free;
2074                 rtd->ops.close          = soc_pcm_close;
2075                 rtd->ops.pointer        = soc_pcm_pointer;
2076                 rtd->ops.ioctl          = soc_pcm_ioctl;
2077         }
2078
2079         if (platform->driver->ops) {
2080                 rtd->ops.ack            = platform->driver->ops->ack;
2081                 rtd->ops.copy           = platform->driver->ops->copy;
2082                 rtd->ops.silence        = platform->driver->ops->silence;
2083                 rtd->ops.page           = platform->driver->ops->page;
2084                 rtd->ops.mmap           = platform->driver->ops->mmap;
2085         }
2086
2087         if (playback)
2088                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2089
2090         if (capture)
2091                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2092
2093         if (platform->driver->pcm_new) {
2094                 ret = platform->driver->pcm_new(rtd);
2095                 if (ret < 0) {
2096                         pr_err("asoc: platform pcm constructor failed\n");
2097                         return ret;
2098                 }
2099         }
2100
2101         pcm->private_free = platform->driver->pcm_free;
2102 out:
2103         printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
2104                 cpu_dai->name);
2105         return ret;
2106 }
2107
2108 /* is the current PCM operation for this FE ? */
2109 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2110 {
2111         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2112                 return 1;
2113         return 0;
2114 }
2115 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2116
2117 /* is the current PCM operation for this BE ? */
2118 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2119                 struct snd_soc_pcm_runtime *be, int stream)
2120 {
2121         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2122            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2123                   be->dpcm[stream].runtime_update))
2124                 return 1;
2125         return 0;
2126 }
2127 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2128
2129 /* get the substream for this BE */
2130 struct snd_pcm_substream *
2131         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2132 {
2133         return be->pcm->streams[stream].substream;
2134 }
2135 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2136
2137 /* get the BE runtime state */
2138 enum snd_soc_dpcm_state
2139         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2140 {
2141         return be->dpcm[stream].state;
2142 }
2143 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2144
2145 /* set the BE runtime state */
2146 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2147                 int stream, enum snd_soc_dpcm_state state)
2148 {
2149         be->dpcm[stream].state = state;
2150 }
2151 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2152
2153 /*
2154  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2155  * are not running, paused or suspended for the specified stream direction.
2156  */
2157 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2158                 struct snd_soc_pcm_runtime *be, int stream)
2159 {
2160         struct snd_soc_dpcm *dpcm;
2161         int state;
2162
2163         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2164
2165                 if (dpcm->fe == fe)
2166                         continue;
2167
2168                 state = dpcm->fe->dpcm[stream].state;
2169                 if (state == SND_SOC_DPCM_STATE_START ||
2170                         state == SND_SOC_DPCM_STATE_PAUSED ||
2171                         state == SND_SOC_DPCM_STATE_SUSPEND)
2172                         return 0;
2173         }
2174
2175         /* it's safe to free/stop this BE DAI */
2176         return 1;
2177 }
2178 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2179
2180 /*
2181  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2182  * running, paused or suspended for the specified stream direction.
2183  */
2184 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2185                 struct snd_soc_pcm_runtime *be, int stream)
2186 {
2187         struct snd_soc_dpcm *dpcm;
2188         int state;
2189
2190         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2191
2192                 if (dpcm->fe == fe)
2193                         continue;
2194
2195                 state = dpcm->fe->dpcm[stream].state;
2196                 if (state == SND_SOC_DPCM_STATE_START ||
2197                         state == SND_SOC_DPCM_STATE_PAUSED ||
2198                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2199                         state == SND_SOC_DPCM_STATE_PREPARE)
2200                         return 0;
2201         }
2202
2203         /* it's safe to change hw_params */
2204         return 1;
2205 }
2206 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2207
2208 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2209                 int cmd, struct snd_soc_platform *platform)
2210 {
2211         if (platform->driver->ops->trigger)
2212                 return platform->driver->ops->trigger(substream, cmd);
2213         return 0;
2214 }
2215 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2216
2217 #ifdef CONFIG_DEBUG_FS
2218 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2219 {
2220         switch (state) {
2221         case SND_SOC_DPCM_STATE_NEW:
2222                 return "new";
2223         case SND_SOC_DPCM_STATE_OPEN:
2224                 return "open";
2225         case SND_SOC_DPCM_STATE_HW_PARAMS:
2226                 return "hw_params";
2227         case SND_SOC_DPCM_STATE_PREPARE:
2228                 return "prepare";
2229         case SND_SOC_DPCM_STATE_START:
2230                 return "start";
2231         case SND_SOC_DPCM_STATE_STOP:
2232                 return "stop";
2233         case SND_SOC_DPCM_STATE_SUSPEND:
2234                 return "suspend";
2235         case SND_SOC_DPCM_STATE_PAUSED:
2236                 return "paused";
2237         case SND_SOC_DPCM_STATE_HW_FREE:
2238                 return "hw_free";
2239         case SND_SOC_DPCM_STATE_CLOSE:
2240                 return "close";
2241         }
2242
2243         return "unknown";
2244 }
2245
2246 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2247                                 int stream, char *buf, size_t size)
2248 {
2249         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2250         struct snd_soc_dpcm *dpcm;
2251         ssize_t offset = 0;
2252
2253         /* FE state */
2254         offset += snprintf(buf + offset, size - offset,
2255                         "[%s - %s]\n", fe->dai_link->name,
2256                         stream ? "Capture" : "Playback");
2257
2258         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2259                         dpcm_state_string(fe->dpcm[stream].state));
2260
2261         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2262             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2263                 offset += snprintf(buf + offset, size - offset,
2264                                 "Hardware Params: "
2265                                 "Format = %s, Channels = %d, Rate = %d\n",
2266                                 snd_pcm_format_name(params_format(params)),
2267                                 params_channels(params),
2268                                 params_rate(params));
2269
2270         /* BEs state */
2271         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2272
2273         if (list_empty(&fe->dpcm[stream].be_clients)) {
2274                 offset += snprintf(buf + offset, size - offset,
2275                                 " No active DSP links\n");
2276                 goto out;
2277         }
2278
2279         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2280                 struct snd_soc_pcm_runtime *be = dpcm->be;
2281                 params = &dpcm->hw_params;
2282
2283                 offset += snprintf(buf + offset, size - offset,
2284                                 "- %s\n", be->dai_link->name);
2285
2286                 offset += snprintf(buf + offset, size - offset,
2287                                 "   State: %s\n",
2288                                 dpcm_state_string(be->dpcm[stream].state));
2289
2290                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2291                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2292                         offset += snprintf(buf + offset, size - offset,
2293                                 "   Hardware Params: "
2294                                 "Format = %s, Channels = %d, Rate = %d\n",
2295                                 snd_pcm_format_name(params_format(params)),
2296                                 params_channels(params),
2297                                 params_rate(params));
2298         }
2299
2300 out:
2301         return offset;
2302 }
2303
2304 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2305                                 size_t count, loff_t *ppos)
2306 {
2307         struct snd_soc_pcm_runtime *fe = file->private_data;
2308         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2309         char *buf;
2310
2311         buf = kmalloc(out_count, GFP_KERNEL);
2312         if (!buf)
2313                 return -ENOMEM;
2314
2315         if (fe->cpu_dai->driver->playback.channels_min)
2316                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2317                                         buf + offset, out_count - offset);
2318
2319         if (fe->cpu_dai->driver->capture.channels_min)
2320                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2321                                         buf + offset, out_count - offset);
2322
2323         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2324
2325         kfree(buf);
2326         return ret;
2327 }
2328
2329 static const struct file_operations dpcm_state_fops = {
2330         .open = simple_open,
2331         .read = dpcm_state_read_file,
2332         .llseek = default_llseek,
2333 };
2334
2335 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2336 {
2337         if (!rtd->dai_link)
2338                 return 0;
2339
2340         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2341                         rtd->card->debugfs_card_root);
2342         if (!rtd->debugfs_dpcm_root) {
2343                 dev_dbg(rtd->dev,
2344                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2345                          rtd->dai_link->name);
2346                 return -EINVAL;
2347         }
2348
2349         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2350                                                 rtd->debugfs_dpcm_root,
2351                                                 rtd, &dpcm_state_fops);
2352
2353         return 0;
2354 }
2355 #endif