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 /**
  37  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
  38  * @substream: the pcm substream
  39  * @hw: the hardware parameters
  40  *
  41  * Sets the substream runtime hardware parameters.
  42  */
  43 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
  44         const struct snd_pcm_hardware *hw)
  45 {
  46         struct snd_pcm_runtime *runtime = substream->runtime;
  47         runtime->hw.info = hw->info;
  48         runtime->hw.formats = hw->formats;
  49         runtime->hw.period_bytes_min = hw->period_bytes_min;
  50         runtime->hw.period_bytes_max = hw->period_bytes_max;
  51         runtime->hw.periods_min = hw->periods_min;
  52         runtime->hw.periods_max = hw->periods_max;
  53         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
  54         runtime->hw.fifo_size = hw->fifo_size;
  55         return 0;
  56 }
  57 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
  58
  59 /* DPCM stream event, send event to FE and all active BEs. */
  60 static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
  61         int event)
  62 {
  63         struct snd_soc_dpcm *dpcm;
  64
  65         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
  66
  67                 struct snd_soc_pcm_runtime *be = dpcm->be;
  68
  69                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
  70                                 be->dai_link->name, event, dir);
  71
  72                 snd_soc_dapm_stream_event(be, dir, event);
  73         }
  74
  75         snd_soc_dapm_stream_event(fe, dir, event);
  76
  77         return 0;
  78 }
  79
  80 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
  81                                         struct snd_soc_dai *soc_dai)
  82 {
  83         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  84         int ret;
  85
  86         if (!soc_dai->driver->symmetric_rates &&
  87             !rtd->dai_link->symmetric_rates)
  88                 return 0;
  89
  90         /* This can happen if multiple streams are starting simultaneously -
  91          * the second can need to get its constraints before the first has
  92          * picked a rate.  Complain and allow the application to carry on.
  93          */
  94         if (!soc_dai->rate) {
  95                 dev_warn(soc_dai->dev,
  96                          "ASoC: Not enforcing symmetric_rates due to race\n");
  97                 return 0;
  98         }
  99
 100         dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n", soc_dai->rate);
 101
 102         ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 103                                            SNDRV_PCM_HW_PARAM_RATE,
 104                                            soc_dai->rate, soc_dai->rate);
 105         if (ret < 0) {
 106                 dev_err(soc_dai->dev,
 107                         "ASoC: Unable to apply rate symmetry constraint: %d\n",
 108                         ret);
 109                 return ret;
 110         }
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * List of sample sizes that might go over the bus for parameter
 117  * application.  There ought to be a wildcard sample size for things
 118  * like the DAC/ADC resolution to use but there isn't right now.
 119  */
 120 static int sample_sizes[] = {
 121         24, 32,
 122 };
 123
 124 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
 125                               struct snd_soc_dai *dai)
 126 {
 127         int ret, i, bits;
 128
 129         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 130                 bits = dai->driver->playback.sig_bits;
 131         else
 132                 bits = dai->driver->capture.sig_bits;
 133
 134         if (!bits)
 135                 return;
 136
 137         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
 138                 if (bits >= sample_sizes[i])
 139                         continue;
 140
 141                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
 142                                                    sample_sizes[i], bits);
 143                 if (ret != 0)
 144                         dev_warn(dai->dev,
 145                                  "ASoC: Failed to set MSB %d/%d: %d\n",
 146                                  bits, sample_sizes[i], ret);
 147         }
 148 }
 149
 150 static void soc_pcm_init_runtime_hw(struct snd_pcm_hardware *hw,
 151         struct snd_soc_pcm_stream *codec_stream,
 152         struct snd_soc_pcm_stream *cpu_stream)
 153 {
 154         hw->rate_min = max(codec_stream->rate_min, cpu_stream->rate_min);
 155         hw->rate_max = max(codec_stream->rate_max, cpu_stream->rate_max);
 156         hw->channels_min = max(codec_stream->channels_min,
 157                 cpu_stream->channels_min);
 158         hw->channels_max = min(codec_stream->channels_max,
 159                 cpu_stream->channels_max);
 160         hw->formats = codec_stream->formats & cpu_stream->formats;
 161         hw->rates = codec_stream->rates & cpu_stream->rates;
 162         if (codec_stream->rates
 163                 & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 164                 hw->rates |= cpu_stream->rates;
 165         if (cpu_stream->rates
 166                 & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 167                 hw->rates |= codec_stream->rates;
 168 }
 169
 170 /*
 171  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 172  * then initialized and any private data can be allocated. This also calls
 173  * startup for the cpu DAI, platform, machine and codec DAI.
 174  */
 175 static int soc_pcm_open(struct snd_pcm_substream *substream)
 176 {
 177         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 178         struct snd_pcm_runtime *runtime = substream->runtime;
 179         struct snd_soc_platform *platform = rtd->platform;
 180         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 181         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 182         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
 183         struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
 184         int ret = 0;
 185
 186         pm_runtime_get_sync(cpu_dai->dev);
 187         pm_runtime_get_sync(codec_dai->dev);
 188         pm_runtime_get_sync(platform->dev);
 189
 190         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 191
 192         /* startup the audio subsystem */
 193         if (cpu_dai->driver->ops->startup) {
 194                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 195                 if (ret < 0) {
 196                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 197                                 " %s: %d\n", cpu_dai->name, ret);
 198                         goto out;
 199                 }
 200         }
 201
 202         if (platform->driver->ops && platform->driver->ops->open) {
 203                 ret = platform->driver->ops->open(substream);
 204                 if (ret < 0) {
 205                         dev_err(platform->dev, "ASoC: can't open platform"
 206                                 " %s: %d\n", platform->name, ret);
 207                         goto platform_err;
 208                 }
 209         }
 210
 211         if (codec_dai->driver->ops->startup) {
 212                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
 213                 if (ret < 0) {
 214                         dev_err(codec_dai->dev, "ASoC: can't open codec"
 215                                 " %s: %d\n", codec_dai->name, ret);
 216                         goto codec_dai_err;
 217                 }
 218         }
 219
 220         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 221                 ret = rtd->dai_link->ops->startup(substream);
 222                 if (ret < 0) {
 223                         pr_err("ASoC: %s startup failed: %d\n",
 224                                rtd->dai_link->name, ret);
 225                         goto machine_err;
 226                 }
 227         }
 228
 229         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 230         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 231                 goto dynamic;
 232
 233         /* Check that the codec and cpu DAIs are compatible */
 234         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 235                 soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->playback,
 236                         &cpu_dai_drv->playback);
 237         } else {
 238                 soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->capture,
 239                         &cpu_dai_drv->capture);
 240         }
 241
 242         ret = -EINVAL;
 243         snd_pcm_limit_hw_rates(runtime);
 244         if (!runtime->hw.rates) {
 245                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 246                         codec_dai->name, cpu_dai->name);
 247                 goto config_err;
 248         }
 249         if (!runtime->hw.formats) {
 250                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 251                         codec_dai->name, cpu_dai->name);
 252                 goto config_err;
 253         }
 254         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 255             runtime->hw.channels_min > runtime->hw.channels_max) {
 256                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 257                                 codec_dai->name, cpu_dai->name);
 258                 goto config_err;
 259         }
 260
 261         soc_pcm_apply_msb(substream, codec_dai);
 262         soc_pcm_apply_msb(substream, cpu_dai);
 263
 264         /* Symmetry only applies if we've already got an active stream. */
 265         if (cpu_dai->active) {
 266                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 267                 if (ret != 0)
 268                         goto config_err;
 269         }
 270
 271         if (codec_dai->active) {
 272                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
 273                 if (ret != 0)
 274                         goto config_err;
 275         }
 276
 277         pr_debug("ASoC: %s <-> %s info:\n",
 278                         codec_dai->name, cpu_dai->name);
 279         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 280         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 281                  runtime->hw.channels_max);
 282         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 283                  runtime->hw.rate_max);
 284
 285 dynamic:
 286         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 287                 cpu_dai->playback_active++;
 288                 codec_dai->playback_active++;
 289         } else {
 290                 cpu_dai->capture_active++;
 291                 codec_dai->capture_active++;
 292         }
 293         cpu_dai->active++;
 294         codec_dai->active++;
 295         rtd->codec->active++;
 296         mutex_unlock(&rtd->pcm_mutex);
 297         return 0;
 298
 299 config_err:
 300         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 301                 rtd->dai_link->ops->shutdown(substream);
 302
 303 machine_err:
 304         if (codec_dai->driver->ops->shutdown)
 305                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 306
 307 codec_dai_err:
 308         if (platform->driver->ops && platform->driver->ops->close)
 309                 platform->driver->ops->close(substream);
 310
 311 platform_err:
 312         if (cpu_dai->driver->ops->shutdown)
 313                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 314 out:
 315         mutex_unlock(&rtd->pcm_mutex);
 316
 317         pm_runtime_put(platform->dev);
 318         pm_runtime_put(codec_dai->dev);
 319         pm_runtime_put(cpu_dai->dev);
 320
 321         return ret;
 322 }
 323
 324 /*
 325  * Power down the audio subsystem pmdown_time msecs after close is called.
 326  * This is to ensure there are no pops or clicks in between any music tracks
 327  * due to DAPM power cycling.
 328  */
 329 static void close_delayed_work(struct work_struct *work)
 330 {
 331         struct snd_soc_pcm_runtime *rtd =
 332                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 333         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 334
 335         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 336
 337         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 338                  codec_dai->driver->playback.stream_name,
 339                  codec_dai->playback_active ? "active" : "inactive",
 340                  rtd->pop_wait ? "yes" : "no");
 341
 342         /* are we waiting on this codec DAI stream */
 343         if (rtd->pop_wait == 1) {
 344                 rtd->pop_wait = 0;
 345                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 346                                           SND_SOC_DAPM_STREAM_STOP);
 347         }
 348
 349         mutex_unlock(&rtd->pcm_mutex);
 350 }
 351
 352 /*
 353  * Called by ALSA when a PCM substream is closed. Private data can be
 354  * freed here. The cpu DAI, codec DAI, machine and platform are also
 355  * shutdown.
 356  */
 357 static int soc_pcm_close(struct snd_pcm_substream *substream)
 358 {
 359         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 360         struct snd_soc_platform *platform = rtd->platform;
 361         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 362         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 363         struct snd_soc_codec *codec = rtd->codec;
 364
 365         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 366
 367         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 368                 cpu_dai->playback_active--;
 369                 codec_dai->playback_active--;
 370         } else {
 371                 cpu_dai->capture_active--;
 372                 codec_dai->capture_active--;
 373         }
 374
 375         cpu_dai->active--;
 376         codec_dai->active--;
 377         codec->active--;
 378
 379         /* clear the corresponding DAIs rate when inactive */
 380         if (!cpu_dai->active)
 381                 cpu_dai->rate = 0;
 382
 383         if (!codec_dai->active)
 384                 codec_dai->rate = 0;
 385
 386         /* Muting the DAC suppresses artifacts caused during digital
 387          * shutdown, for example from stopping clocks.
 388          */
 389         snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
 390
 391         if (cpu_dai->driver->ops->shutdown)
 392                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 393
 394         if (codec_dai->driver->ops->shutdown)
 395                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 396
 397         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 398                 rtd->dai_link->ops->shutdown(substream);
 399
 400         if (platform->driver->ops && platform->driver->ops->close)
 401                 platform->driver->ops->close(substream);
 402         cpu_dai->runtime = NULL;
 403
 404         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 405                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 406                     rtd->dai_link->ignore_pmdown_time) {
 407                         /* powered down playback stream now */
 408                         snd_soc_dapm_stream_event(rtd,
 409                                                   SNDRV_PCM_STREAM_PLAYBACK,
 410                                                   SND_SOC_DAPM_STREAM_STOP);
 411                 } else {
 412                         /* start delayed pop wq here for playback streams */
 413                         rtd->pop_wait = 1;
 414                         schedule_delayed_work(&rtd->delayed_work,
 415                                 msecs_to_jiffies(rtd->pmdown_time));
 416                 }
 417         } else {
 418                 /* capture streams can be powered down now */
 419                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 420                                           SND_SOC_DAPM_STREAM_STOP);
 421         }
 422
 423         mutex_unlock(&rtd->pcm_mutex);
 424
 425         pm_runtime_put(platform->dev);
 426         pm_runtime_put(codec_dai->dev);
 427         pm_runtime_put(cpu_dai->dev);
 428
 429         return 0;
 430 }
 431
 432 /*
 433  * Called by ALSA when the PCM substream is prepared, can set format, sample
 434  * rate, etc.  This function is non atomic and can be called multiple times,
 435  * it can refer to the runtime info.
 436  */
 437 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 438 {
 439         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 440         struct snd_soc_platform *platform = rtd->platform;
 441         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 442         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 443         int ret = 0;
 444
 445         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 446
 447         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 448                 ret = rtd->dai_link->ops->prepare(substream);
 449                 if (ret < 0) {
 450                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 451                                 " %d\n", ret);
 452                         goto out;
 453                 }
 454         }
 455
 456         if (platform->driver->ops && platform->driver->ops->prepare) {
 457                 ret = platform->driver->ops->prepare(substream);
 458                 if (ret < 0) {
 459                         dev_err(platform->dev, "ASoC: platform prepare error:"
 460                                 " %d\n", ret);
 461                         goto out;
 462                 }
 463         }
 464
 465         if (codec_dai->driver->ops->prepare) {
 466                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
 467                 if (ret < 0) {
 468                         dev_err(codec_dai->dev, "ASoC: DAI prepare error: %d\n",
 469                                 ret);
 470                         goto out;
 471                 }
 472         }
 473
 474         if (cpu_dai->driver->ops->prepare) {
 475                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 476                 if (ret < 0) {
 477                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
 478                                 ret);
 479                         goto out;
 480                 }
 481         }
 482
 483         /* cancel any delayed stream shutdown that is pending */
 484         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 485             rtd->pop_wait) {
 486                 rtd->pop_wait = 0;
 487                 cancel_delayed_work(&rtd->delayed_work);
 488         }
 489
 490         snd_soc_dapm_stream_event(rtd, substream->stream,
 491                         SND_SOC_DAPM_STREAM_START);
 492
 493         snd_soc_dai_digital_mute(codec_dai, 0, substream->stream);
 494
 495 out:
 496         mutex_unlock(&rtd->pcm_mutex);
 497         return ret;
 498 }
 499
 500 /*
 501  * Called by ALSA when the hardware params are set by application. This
 502  * function can also be called multiple times and can allocate buffers
 503  * (using snd_pcm_lib_* ). It's non-atomic.
 504  */
 505 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 506                                 struct snd_pcm_hw_params *params)
 507 {
 508         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 509         struct snd_soc_platform *platform = rtd->platform;
 510         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 511         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 512         int ret = 0;
 513
 514         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 515
 516         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 517                 ret = rtd->dai_link->ops->hw_params(substream, params);
 518                 if (ret < 0) {
 519                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 520                                 " failed: %d\n", ret);
 521                         goto out;
 522                 }
 523         }
 524
 525         if (codec_dai->driver->ops->hw_params) {
 526                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
 527                 if (ret < 0) {
 528                         dev_err(codec_dai->dev, "ASoC: can't set %s hw params:"
 529                                 " %d\n", codec_dai->name, ret);
 530                         goto codec_err;
 531                 }
 532         }
 533
 534         if (cpu_dai->driver->ops->hw_params) {
 535                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
 536                 if (ret < 0) {
 537                         dev_err(cpu_dai->dev, "ASoC: %s hw params failed: %d\n",
 538                                 cpu_dai->name, ret);
 539                         goto interface_err;
 540                 }
 541         }
 542
 543         if (platform->driver->ops && platform->driver->ops->hw_params) {
 544                 ret = platform->driver->ops->hw_params(substream, params);
 545                 if (ret < 0) {
 546                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 547                                platform->name, ret);
 548                         goto platform_err;
 549                 }
 550         }
 551
 552         /* store the rate for each DAIs */
 553         cpu_dai->rate = params_rate(params);
 554         codec_dai->rate = params_rate(params);
 555
 556 out:
 557         mutex_unlock(&rtd->pcm_mutex);
 558         return ret;
 559
 560 platform_err:
 561         if (cpu_dai->driver->ops->hw_free)
 562                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 563
 564 interface_err:
 565         if (codec_dai->driver->ops->hw_free)
 566                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 567
 568 codec_err:
 569         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 570                 rtd->dai_link->ops->hw_free(substream);
 571
 572         mutex_unlock(&rtd->pcm_mutex);
 573         return ret;
 574 }
 575
 576 /*
 577  * Frees resources allocated by hw_params, can be called multiple times
 578  */
 579 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 580 {
 581         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 582         struct snd_soc_platform *platform = rtd->platform;
 583         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 584         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 585         struct snd_soc_codec *codec = rtd->codec;
 586
 587         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 588
 589         /* apply codec digital mute */
 590         if (!codec->active)
 591                 snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
 592
 593         /* free any machine hw params */
 594         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 595                 rtd->dai_link->ops->hw_free(substream);
 596
 597         /* free any DMA resources */
 598         if (platform->driver->ops && platform->driver->ops->hw_free)
 599                 platform->driver->ops->hw_free(substream);
 600
 601         /* now free hw params for the DAIs  */
 602         if (codec_dai->driver->ops->hw_free)
 603                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 604
 605         if (cpu_dai->driver->ops->hw_free)
 606                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 607
 608         mutex_unlock(&rtd->pcm_mutex);
 609         return 0;
 610 }
 611
 612 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 613 {
 614         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 615         struct snd_soc_platform *platform = rtd->platform;
 616         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 617         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 618         int ret;
 619
 620         if (codec_dai->driver->ops->trigger) {
 621                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
 622                 if (ret < 0)
 623                         return ret;
 624         }
 625
 626         if (platform->driver->ops && platform->driver->ops->trigger) {
 627                 ret = platform->driver->ops->trigger(substream, cmd);
 628                 if (ret < 0)
 629                         return ret;
 630         }
 631
 632         if (cpu_dai->driver->ops->trigger) {
 633                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 634                 if (ret < 0)
 635                         return ret;
 636         }
 637         return 0;
 638 }
 639
 640 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
 641                                    int cmd)
 642 {
 643         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 644         struct snd_soc_platform *platform = rtd->platform;
 645         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 646         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 647         int ret;
 648
 649         if (codec_dai->driver->ops->bespoke_trigger) {
 650                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
 651                 if (ret < 0)
 652                         return ret;
 653         }
 654
 655         if (platform->driver->bespoke_trigger) {
 656                 ret = platform->driver->bespoke_trigger(substream, cmd);
 657                 if (ret < 0)
 658                         return ret;
 659         }
 660
 661         if (cpu_dai->driver->ops->bespoke_trigger) {
 662                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
 663                 if (ret < 0)
 664                         return ret;
 665         }
 666         return 0;
 667 }
 668 /*
 669  * soc level wrapper for pointer callback
 670  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 671  * the runtime->delay will be updated accordingly.
 672  */
 673 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 674 {
 675         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 676         struct snd_soc_platform *platform = rtd->platform;
 677         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 678         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 679         struct snd_pcm_runtime *runtime = substream->runtime;
 680         snd_pcm_uframes_t offset = 0;
 681         snd_pcm_sframes_t delay = 0;
 682
 683         if (platform->driver->ops && platform->driver->ops->pointer)
 684                 offset = platform->driver->ops->pointer(substream);
 685
 686         if (cpu_dai->driver->ops->delay)
 687                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 688
 689         if (codec_dai->driver->ops->delay)
 690                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 691
 692         if (platform->driver->delay)
 693                 delay += platform->driver->delay(substream, codec_dai);
 694
 695         runtime->delay = delay;
 696
 697         return offset;
 698 }
 699
 700 /* connect a FE and BE */
 701 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
 702                 struct snd_soc_pcm_runtime *be, int stream)
 703 {
 704         struct snd_soc_dpcm *dpcm;
 705
 706         /* only add new dpcms */
 707         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 708                 if (dpcm->be == be && dpcm->fe == fe)
 709                         return 0;
 710         }
 711
 712         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
 713         if (!dpcm)
 714                 return -ENOMEM;
 715
 716         dpcm->be = be;
 717         dpcm->fe = fe;
 718         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
 719         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
 720         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
 721         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
 722
 723         dev_dbg(fe->dev, "  connected new DPCM %s path %s %s %s\n",
 724                         stream ? "capture" : "playback",  fe->dai_link->name,
 725                         stream ? "<-" : "->", be->dai_link->name);
 726
 727 #ifdef CONFIG_DEBUG_FS
 728         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
 729                         fe->debugfs_dpcm_root, &dpcm->state);
 730 #endif
 731         return 1;
 732 }
 733
 734 /* reparent a BE onto another FE */
 735 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
 736                         struct snd_soc_pcm_runtime *be, int stream)
 737 {
 738         struct snd_soc_dpcm *dpcm;
 739         struct snd_pcm_substream *fe_substream, *be_substream;
 740
 741         /* reparent if BE is connected to other FEs */
 742         if (!be->dpcm[stream].users)
 743                 return;
 744
 745         be_substream = snd_soc_dpcm_get_substream(be, stream);
 746
 747         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
 748                 if (dpcm->fe == fe)
 749                         continue;
 750
 751                 dev_dbg(fe->dev, "  reparent %s path %s %s %s\n",
 752                         stream ? "capture" : "playback",
 753                         dpcm->fe->dai_link->name,
 754                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 755
 756                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
 757                 be_substream->runtime = fe_substream->runtime;
 758                 break;
 759         }
 760 }
 761
 762 /* disconnect a BE and FE */
 763 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
 764 {
 765         struct snd_soc_dpcm *dpcm, *d;
 766
 767         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
 768                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
 769                                 stream ? "capture" : "playback",
 770                                 dpcm->be->dai_link->name);
 771
 772                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
 773                         continue;
 774
 775                 dev_dbg(fe->dev, "  freed DSP %s path %s %s %s\n",
 776                         stream ? "capture" : "playback", fe->dai_link->name,
 777                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 778
 779                 /* BEs still alive need new FE */
 780                 dpcm_be_reparent(fe, dpcm->be, stream);
 781
 782 #ifdef CONFIG_DEBUG_FS
 783                 debugfs_remove(dpcm->debugfs_state);
 784 #endif
 785                 list_del(&dpcm->list_be);
 786                 list_del(&dpcm->list_fe);
 787                 kfree(dpcm);
 788         }
 789 }
 790
 791 /* get BE for DAI widget and stream */
 792 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
 793                 struct snd_soc_dapm_widget *widget, int stream)
 794 {
 795         struct snd_soc_pcm_runtime *be;
 796         int i;
 797
 798         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 799                 for (i = 0; i < card->num_links; i++) {
 800                         be = &card->rtd[i];
 801
 802                         if (!be->dai_link->no_pcm)
 803                                 continue;
 804
 805                         if (be->cpu_dai->playback_widget == widget ||
 806                                 be->codec_dai->playback_widget == widget)
 807                                 return be;
 808                 }
 809         } else {
 810
 811                 for (i = 0; i < card->num_links; i++) {
 812                         be = &card->rtd[i];
 813
 814                         if (!be->dai_link->no_pcm)
 815                                 continue;
 816
 817                         if (be->cpu_dai->capture_widget == widget ||
 818                                 be->codec_dai->capture_widget == widget)
 819                                 return be;
 820                 }
 821         }
 822
 823         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
 824                 stream ? "capture" : "playback", widget->name);
 825         return NULL;
 826 }
 827
 828 static inline struct snd_soc_dapm_widget *
 829         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 830 {
 831         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 832                 return rtd->cpu_dai->playback_widget;
 833         else
 834                 return rtd->cpu_dai->capture_widget;
 835 }
 836
 837 static inline struct snd_soc_dapm_widget *
 838         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 839 {
 840         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 841                 return rtd->codec_dai->playback_widget;
 842         else
 843                 return rtd->codec_dai->capture_widget;
 844 }
 845
 846 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 847                 struct snd_soc_dapm_widget *widget)
 848 {
 849         int i;
 850
 851         for (i = 0; i < list->num_widgets; i++) {
 852                 if (widget == list->widgets[i])
 853                         return 1;
 854         }
 855
 856         return 0;
 857 }
 858
 859 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 860         int stream, struct snd_soc_dapm_widget_list **list_)
 861 {
 862         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
 863         struct snd_soc_dapm_widget_list *list;
 864         int paths;
 865
 866         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
 867                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
 868         if (list == NULL)
 869                 return -ENOMEM;
 870
 871         /* get number of valid DAI paths and their widgets */
 872         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
 873
 874         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
 875                         stream ? "capture" : "playback");
 876
 877         *list_ = list;
 878         return paths;
 879 }
 880
 881 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 882 {
 883         kfree(*list);
 884 }
 885
 886 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
 887         struct snd_soc_dapm_widget_list **list_)
 888 {
 889         struct snd_soc_dpcm *dpcm;
 890         struct snd_soc_dapm_widget_list *list = *list_;
 891         struct snd_soc_dapm_widget *widget;
 892         int prune = 0;
 893
 894         /* Destroy any old FE <--> BE connections */
 895         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 896
 897                 /* is there a valid CPU DAI widget for this BE */
 898                 widget = rtd_get_cpu_widget(dpcm->be, stream);
 899
 900                 /* prune the BE if it's no longer in our active list */
 901                 if (widget && widget_in_list(list, widget))
 902                         continue;
 903
 904                 /* is there a valid CODEC DAI widget for this BE */
 905                 widget = rtd_get_codec_widget(dpcm->be, stream);
 906
 907                 /* prune the BE if it's no longer in our active list */
 908                 if (widget && widget_in_list(list, widget))
 909                         continue;
 910
 911                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
 912                         stream ? "capture" : "playback",
 913                         dpcm->be->dai_link->name, fe->dai_link->name);
 914                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 915                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 916                 prune++;
 917         }
 918
 919         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
 920         return prune;
 921 }
 922
 923 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
 924         struct snd_soc_dapm_widget_list **list_)
 925 {
 926         struct snd_soc_card *card = fe->card;
 927         struct snd_soc_dapm_widget_list *list = *list_;
 928         struct snd_soc_pcm_runtime *be;
 929         int i, new = 0, err;
 930
 931         /* Create any new FE <--> BE connections */
 932         for (i = 0; i < list->num_widgets; i++) {
 933
 934                 switch (list->widgets[i]->id) {
 935                 case snd_soc_dapm_dai_in:
 936                 case snd_soc_dapm_dai_out:
 937                         break;
 938                 default:
 939                         continue;
 940                 }
 941
 942                 /* is there a valid BE rtd for this widget */
 943                 be = dpcm_get_be(card, list->widgets[i], stream);
 944                 if (!be) {
 945                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
 946                                         list->widgets[i]->name);
 947                         continue;
 948                 }
 949
 950                 /* make sure BE is a real BE */
 951                 if (!be->dai_link->no_pcm)
 952                         continue;
 953
 954                 /* don't connect if FE is not running */
 955                 if (!fe->dpcm[stream].runtime)
 956                         continue;
 957
 958                 /* newly connected FE and BE */
 959                 err = dpcm_be_connect(fe, be, stream);
 960                 if (err < 0) {
 961                         dev_err(fe->dev, "ASoC: can't connect %s\n",
 962                                 list->widgets[i]->name);
 963                         break;
 964                 } else if (err == 0) /* already connected */
 965                         continue;
 966
 967                 /* new */
 968                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 969                 new++;
 970         }
 971
 972         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
 973         return new;
 974 }
 975
 976 /*
 977  * Find the corresponding BE DAIs that source or sink audio to this
 978  * FE substream.
 979  */
 980 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 981         int stream, struct snd_soc_dapm_widget_list **list, int new)
 982 {
 983         if (new)
 984                 return dpcm_add_paths(fe, stream, list);
 985         else
 986                 return dpcm_prune_paths(fe, stream, list);
 987 }
 988
 989 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
 990 {
 991         struct snd_soc_dpcm *dpcm;
 992
 993         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
 994                 dpcm->be->dpcm[stream].runtime_update =
 995                                                 SND_SOC_DPCM_UPDATE_NO;
 996 }
 997
 998 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
 999         int stream)
1000 {
1001         struct snd_soc_dpcm *dpcm;
1002
1003         /* disable any enabled and non active backends */
1004         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1005
1006                 struct snd_soc_pcm_runtime *be = dpcm->be;
1007                 struct snd_pcm_substream *be_substream =
1008                         snd_soc_dpcm_get_substream(be, stream);
1009
1010                 if (be->dpcm[stream].users == 0)
1011                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1012                                 stream ? "capture" : "playback",
1013                                 be->dpcm[stream].state);
1014
1015                 if (--be->dpcm[stream].users != 0)
1016                         continue;
1017
1018                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1019                         continue;
1020
1021                 soc_pcm_close(be_substream);
1022                 be_substream->runtime = NULL;
1023                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1024         }
1025 }
1026
1027 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1028 {
1029         struct snd_soc_dpcm *dpcm;
1030         int err, count = 0;
1031
1032         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1033         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1034
1035                 struct snd_soc_pcm_runtime *be = dpcm->be;
1036                 struct snd_pcm_substream *be_substream =
1037                         snd_soc_dpcm_get_substream(be, stream);
1038
1039                 /* is this op for this BE ? */
1040                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1041                         continue;
1042
1043                 /* first time the dpcm is open ? */
1044                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1045                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1046                                 stream ? "capture" : "playback",
1047                                 be->dpcm[stream].state);
1048
1049                 if (be->dpcm[stream].users++ != 0)
1050                         continue;
1051
1052                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1053                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1054                         continue;
1055
1056                 dev_dbg(be->dev, "ASoC: open BE %s\n", be->dai_link->name);
1057
1058                 be_substream->runtime = be->dpcm[stream].runtime;
1059                 err = soc_pcm_open(be_substream);
1060                 if (err < 0) {
1061                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1062                         be->dpcm[stream].users--;
1063                         if (be->dpcm[stream].users < 0)
1064                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1065                                         stream ? "capture" : "playback",
1066                                         be->dpcm[stream].state);
1067
1068                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1069                         goto unwind;
1070                 }
1071
1072                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1073                 count++;
1074         }
1075
1076         return count;
1077
1078 unwind:
1079         /* disable any enabled and non active backends */
1080         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1081                 struct snd_soc_pcm_runtime *be = dpcm->be;
1082                 struct snd_pcm_substream *be_substream =
1083                         snd_soc_dpcm_get_substream(be, stream);
1084
1085                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1086                         continue;
1087
1088                 if (be->dpcm[stream].users == 0)
1089                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1090                                 stream ? "capture" : "playback",
1091                                 be->dpcm[stream].state);
1092
1093                 if (--be->dpcm[stream].users != 0)
1094                         continue;
1095
1096                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1097                         continue;
1098
1099                 soc_pcm_close(be_substream);
1100                 be_substream->runtime = NULL;
1101                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1102         }
1103
1104         return err;
1105 }
1106
1107 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1108 {
1109         struct snd_pcm_runtime *runtime = substream->runtime;
1110         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1111         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1112         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1113
1114         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1115                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1116                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1117                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1118                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1119                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1120                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1121         } else {
1122                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1123                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1124                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1125                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1126                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1127                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1128         }
1129 }
1130
1131 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1132 {
1133         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1134         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1135         int stream = fe_substream->stream, ret = 0;
1136
1137         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1138
1139         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1140         if (ret < 0) {
1141                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1142                 goto be_err;
1143         }
1144
1145         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1146
1147         /* start the DAI frontend */
1148         ret = soc_pcm_open(fe_substream);
1149         if (ret < 0) {
1150                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1151                 goto unwind;
1152         }
1153
1154         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1155
1156         dpcm_set_fe_runtime(fe_substream);
1157         snd_pcm_limit_hw_rates(runtime);
1158
1159         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1160         return 0;
1161
1162 unwind:
1163         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1164 be_err:
1165         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1166         return ret;
1167 }
1168
1169 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1170 {
1171         struct snd_soc_dpcm *dpcm;
1172
1173         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1174         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1175
1176                 struct snd_soc_pcm_runtime *be = dpcm->be;
1177                 struct snd_pcm_substream *be_substream =
1178                         snd_soc_dpcm_get_substream(be, stream);
1179
1180                 /* is this op for this BE ? */
1181                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1182                         continue;
1183
1184                 if (be->dpcm[stream].users == 0)
1185                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1186                                 stream ? "capture" : "playback",
1187                                 be->dpcm[stream].state);
1188
1189                 if (--be->dpcm[stream].users != 0)
1190                         continue;
1191
1192                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1193                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1194                         continue;
1195
1196                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1197                         dpcm->fe->dai_link->name);
1198
1199                 soc_pcm_close(be_substream);
1200                 be_substream->runtime = NULL;
1201
1202                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1203         }
1204         return 0;
1205 }
1206
1207 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1208 {
1209         struct snd_soc_pcm_runtime *fe = substream->private_data;
1210         int stream = substream->stream;
1211
1212         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1213
1214         /* shutdown the BEs */
1215         dpcm_be_dai_shutdown(fe, substream->stream);
1216
1217         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1218
1219         /* now shutdown the frontend */
1220         soc_pcm_close(substream);
1221
1222         /* run the stream event for each BE */
1223         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1224
1225         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1226         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1227         return 0;
1228 }
1229
1230 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1231 {
1232         struct snd_soc_dpcm *dpcm;
1233
1234         /* only hw_params backends that are either sinks or sources
1235          * to this frontend DAI */
1236         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1237
1238                 struct snd_soc_pcm_runtime *be = dpcm->be;
1239                 struct snd_pcm_substream *be_substream =
1240                         snd_soc_dpcm_get_substream(be, stream);
1241
1242                 /* is this op for this BE ? */
1243                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1244                         continue;
1245
1246                 /* only free hw when no longer used - check all FEs */
1247                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1248                                 continue;
1249
1250                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1251                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1252                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1253                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1254                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1255                         continue;
1256
1257                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1258                         dpcm->fe->dai_link->name);
1259
1260                 soc_pcm_hw_free(be_substream);
1261
1262                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1263         }
1264
1265         return 0;
1266 }
1267
1268 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1269 {
1270         struct snd_soc_pcm_runtime *fe = substream->private_data;
1271         int err, stream = substream->stream;
1272
1273         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1274         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1275
1276         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1277
1278         /* call hw_free on the frontend */
1279         err = soc_pcm_hw_free(substream);
1280         if (err < 0)
1281                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1282                         fe->dai_link->name);
1283
1284         /* only hw_params backends that are either sinks or sources
1285          * to this frontend DAI */
1286         err = dpcm_be_dai_hw_free(fe, stream);
1287
1288         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1289         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1290
1291         mutex_unlock(&fe->card->mutex);
1292         return 0;
1293 }
1294
1295 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1296 {
1297         struct snd_soc_dpcm *dpcm;
1298         int ret;
1299
1300         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1301
1302                 struct snd_soc_pcm_runtime *be = dpcm->be;
1303                 struct snd_pcm_substream *be_substream =
1304                         snd_soc_dpcm_get_substream(be, stream);
1305
1306                 /* is this op for this BE ? */
1307                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1308                         continue;
1309
1310                 /* only allow hw_params() if no connected FEs are running */
1311                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1312                         continue;
1313
1314                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1315                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1316                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1317                         continue;
1318
1319                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1320                         dpcm->fe->dai_link->name);
1321
1322                 /* copy params for each dpcm */
1323                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1324                                 sizeof(struct snd_pcm_hw_params));
1325
1326                 /* perform any hw_params fixups */
1327                 if (be->dai_link->be_hw_params_fixup) {
1328                         ret = be->dai_link->be_hw_params_fixup(be,
1329                                         &dpcm->hw_params);
1330                         if (ret < 0) {
1331                                 dev_err(be->dev,
1332                                         "ASoC: hw_params BE fixup failed %d\n",
1333                                         ret);
1334                                 goto unwind;
1335                         }
1336                 }
1337
1338                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1339                 if (ret < 0) {
1340                         dev_err(dpcm->be->dev,
1341                                 "ASoC: hw_params BE failed %d\n", ret);
1342                         goto unwind;
1343                 }
1344
1345                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1346         }
1347         return 0;
1348
1349 unwind:
1350         /* disable any enabled and non active backends */
1351         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1352                 struct snd_soc_pcm_runtime *be = dpcm->be;
1353                 struct snd_pcm_substream *be_substream =
1354                         snd_soc_dpcm_get_substream(be, stream);
1355
1356                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1357                         continue;
1358
1359                 /* only allow hw_free() if no connected FEs are running */
1360                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1361                         continue;
1362
1363                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1364                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1365                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1366                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1367                         continue;
1368
1369                 soc_pcm_hw_free(be_substream);
1370         }
1371
1372         return ret;
1373 }
1374
1375 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1376                                  struct snd_pcm_hw_params *params)
1377 {
1378         struct snd_soc_pcm_runtime *fe = substream->private_data;
1379         int ret, stream = substream->stream;
1380
1381         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1382         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1383
1384         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1385                         sizeof(struct snd_pcm_hw_params));
1386         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1387         if (ret < 0) {
1388                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1389                 goto out;
1390         }
1391
1392         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1393                         fe->dai_link->name, params_rate(params),
1394                         params_channels(params), params_format(params));
1395
1396         /* call hw_params on the frontend */
1397         ret = soc_pcm_hw_params(substream, params);
1398         if (ret < 0) {
1399                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1400                 dpcm_be_dai_hw_free(fe, stream);
1401          } else
1402                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1403
1404 out:
1405         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1406         mutex_unlock(&fe->card->mutex);
1407         return ret;
1408 }
1409
1410 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1411                 struct snd_pcm_substream *substream, int cmd)
1412 {
1413         int ret;
1414
1415         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1416                         dpcm->fe->dai_link->name, cmd);
1417
1418         ret = soc_pcm_trigger(substream, cmd);
1419         if (ret < 0)
1420                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1421
1422         return ret;
1423 }
1424
1425 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1426                                int cmd)
1427 {
1428         struct snd_soc_dpcm *dpcm;
1429         int ret = 0;
1430
1431         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1432
1433                 struct snd_soc_pcm_runtime *be = dpcm->be;
1434                 struct snd_pcm_substream *be_substream =
1435                         snd_soc_dpcm_get_substream(be, stream);
1436
1437                 /* is this op for this BE ? */
1438                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1439                         continue;
1440
1441                 switch (cmd) {
1442                 case SNDRV_PCM_TRIGGER_START:
1443                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1444                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1445                                 continue;
1446
1447                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1448                         if (ret)
1449                                 return ret;
1450
1451                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1452                         break;
1453                 case SNDRV_PCM_TRIGGER_RESUME:
1454                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1455                                 continue;
1456
1457                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1458                         if (ret)
1459                                 return ret;
1460
1461                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1462                         break;
1463                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1464                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1465                                 continue;
1466
1467                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1468                         if (ret)
1469                                 return ret;
1470
1471                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1472                         break;
1473                 case SNDRV_PCM_TRIGGER_STOP:
1474                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1475                                 continue;
1476
1477                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1478                                 continue;
1479
1480                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1481                         if (ret)
1482                                 return ret;
1483
1484                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1485                         break;
1486                 case SNDRV_PCM_TRIGGER_SUSPEND:
1487                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1488                                 continue;
1489
1490                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1491                                 continue;
1492
1493                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1494                         if (ret)
1495                                 return ret;
1496
1497                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1498                         break;
1499                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1500                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1501                                 continue;
1502
1503                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1504                                 continue;
1505
1506                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1507                         if (ret)
1508                                 return ret;
1509
1510                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1511                         break;
1512                 }
1513         }
1514
1515         return ret;
1516 }
1517 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1518
1519 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1520 {
1521         struct snd_soc_pcm_runtime *fe = substream->private_data;
1522         int stream = substream->stream, ret;
1523         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1524
1525         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1526
1527         switch (trigger) {
1528         case SND_SOC_DPCM_TRIGGER_PRE:
1529                 /* call trigger on the frontend before the backend. */
1530
1531                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1532                                 fe->dai_link->name, cmd);
1533
1534                 ret = soc_pcm_trigger(substream, cmd);
1535                 if (ret < 0) {
1536                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1537                         goto out;
1538                 }
1539
1540                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1541                 break;
1542         case SND_SOC_DPCM_TRIGGER_POST:
1543                 /* call trigger on the frontend after the backend. */
1544
1545                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1546                 if (ret < 0) {
1547                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1548                         goto out;
1549                 }
1550
1551                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1552                                 fe->dai_link->name, cmd);
1553
1554                 ret = soc_pcm_trigger(substream, cmd);
1555                 break;
1556         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1557                 /* bespoke trigger() - handles both FE and BEs */
1558
1559                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1560                                 fe->dai_link->name, cmd);
1561
1562                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1563                 if (ret < 0) {
1564                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1565                         goto out;
1566                 }
1567                 break;
1568         default:
1569                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1570                                 fe->dai_link->name);
1571                 ret = -EINVAL;
1572                 goto out;
1573         }
1574
1575         switch (cmd) {
1576         case SNDRV_PCM_TRIGGER_START:
1577         case SNDRV_PCM_TRIGGER_RESUME:
1578         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1579                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1580                 break;
1581         case SNDRV_PCM_TRIGGER_STOP:
1582         case SNDRV_PCM_TRIGGER_SUSPEND:
1583         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1584                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1585                 break;
1586         }
1587
1588 out:
1589         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1590         return ret;
1591 }
1592
1593 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1594 {
1595         struct snd_soc_dpcm *dpcm;
1596         int ret = 0;
1597
1598         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1599
1600                 struct snd_soc_pcm_runtime *be = dpcm->be;
1601                 struct snd_pcm_substream *be_substream =
1602                         snd_soc_dpcm_get_substream(be, stream);
1603
1604                 /* is this op for this BE ? */
1605                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1606                         continue;
1607
1608                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1609                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1610                         continue;
1611
1612                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
1613                         dpcm->fe->dai_link->name);
1614
1615                 ret = soc_pcm_prepare(be_substream);
1616                 if (ret < 0) {
1617                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
1618                                 ret);
1619                         break;
1620                 }
1621
1622                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1623         }
1624         return ret;
1625 }
1626
1627 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1628 {
1629         struct snd_soc_pcm_runtime *fe = substream->private_data;
1630         int stream = substream->stream, ret = 0;
1631
1632         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1633
1634         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
1635
1636         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1637
1638         /* there is no point preparing this FE if there are no BEs */
1639         if (list_empty(&fe->dpcm[stream].be_clients)) {
1640                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
1641                                 fe->dai_link->name);
1642                 ret = -EINVAL;
1643                 goto out;
1644         }
1645
1646         ret = dpcm_be_dai_prepare(fe, substream->stream);
1647         if (ret < 0)
1648                 goto out;
1649
1650         /* call prepare on the frontend */
1651         ret = soc_pcm_prepare(substream);
1652         if (ret < 0) {
1653                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
1654                         fe->dai_link->name);
1655                 goto out;
1656         }
1657
1658         /* run the stream event for each BE */
1659         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1660         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1661
1662 out:
1663         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1664         mutex_unlock(&fe->card->mutex);
1665
1666         return ret;
1667 }
1668
1669 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1670                      unsigned int cmd, void *arg)
1671 {
1672         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1673         struct snd_soc_platform *platform = rtd->platform;
1674
1675         if (platform->driver->ops->ioctl)
1676                 return platform->driver->ops->ioctl(substream, cmd, arg);
1677         return snd_pcm_lib_ioctl(substream, cmd, arg);
1678 }
1679
1680 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1681 {
1682         struct snd_pcm_substream *substream =
1683                 snd_soc_dpcm_get_substream(fe, stream);
1684         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1685         int err;
1686
1687         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
1688                         stream ? "capture" : "playback", fe->dai_link->name);
1689
1690         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1691                 /* call bespoke trigger - FE takes care of all BE triggers */
1692                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
1693                                 fe->dai_link->name);
1694
1695                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1696                 if (err < 0)
1697                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1698         } else {
1699                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
1700                         fe->dai_link->name);
1701
1702                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1703                 if (err < 0)
1704                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1705         }
1706
1707         err = dpcm_be_dai_hw_free(fe, stream);
1708         if (err < 0)
1709                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
1710
1711         err = dpcm_be_dai_shutdown(fe, stream);
1712         if (err < 0)
1713                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
1714
1715         /* run the stream event for each BE */
1716         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1717
1718         return 0;
1719 }
1720
1721 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1722 {
1723         struct snd_pcm_substream *substream =
1724                 snd_soc_dpcm_get_substream(fe, stream);
1725         struct snd_soc_dpcm *dpcm;
1726         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1727         int ret;
1728
1729         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
1730                         stream ? "capture" : "playback", fe->dai_link->name);
1731
1732         /* Only start the BE if the FE is ready */
1733         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1734                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1735                 return -EINVAL;
1736
1737         /* startup must always be called for new BEs */
1738         ret = dpcm_be_dai_startup(fe, stream);
1739         if (ret < 0)
1740                 goto disconnect;
1741
1742         /* keep going if FE state is > open */
1743         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1744                 return 0;
1745
1746         ret = dpcm_be_dai_hw_params(fe, stream);
1747         if (ret < 0)
1748                 goto close;
1749
1750         /* keep going if FE state is > hw_params */
1751         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1752                 return 0;
1753
1754
1755         ret = dpcm_be_dai_prepare(fe, stream);
1756         if (ret < 0)
1757                 goto hw_free;
1758
1759         /* run the stream event for each BE */
1760         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1761
1762         /* keep going if FE state is > prepare */
1763         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1764                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1765                 return 0;
1766
1767         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1768                 /* call trigger on the frontend - FE takes care of all BE triggers */
1769                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
1770                                 fe->dai_link->name);
1771
1772                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1773                 if (ret < 0) {
1774                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
1775                         goto hw_free;
1776                 }
1777         } else {
1778                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
1779                         fe->dai_link->name);
1780
1781                 ret = dpcm_be_dai_trigger(fe, stream,
1782                                         SNDRV_PCM_TRIGGER_START);
1783                 if (ret < 0) {
1784                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1785                         goto hw_free;
1786                 }
1787         }
1788
1789         return 0;
1790
1791 hw_free:
1792         dpcm_be_dai_hw_free(fe, stream);
1793 close:
1794         dpcm_be_dai_shutdown(fe, stream);
1795 disconnect:
1796         /* disconnect any non started BEs */
1797         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1798                 struct snd_soc_pcm_runtime *be = dpcm->be;
1799                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1800                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1801         }
1802
1803         return ret;
1804 }
1805
1806 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1807 {
1808         int ret;
1809
1810         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1811         ret = dpcm_run_update_startup(fe, stream);
1812         if (ret < 0)
1813                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
1814         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1815
1816         return ret;
1817 }
1818
1819 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1820 {
1821         int ret;
1822
1823         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1824         ret = dpcm_run_update_shutdown(fe, stream);
1825         if (ret < 0)
1826                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
1827         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1828
1829         return ret;
1830 }
1831
1832 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1833  * any DAI links.
1834  */
1835 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
1836 {
1837         struct snd_soc_card *card;
1838         int i, old, new, paths;
1839
1840         if (widget->codec)
1841                 card = widget->codec->card;
1842         else if (widget->platform)
1843                 card = widget->platform->card;
1844         else
1845                 return -EINVAL;
1846
1847         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1848         for (i = 0; i < card->num_rtd; i++) {
1849                 struct snd_soc_dapm_widget_list *list;
1850                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1851
1852                 /* make sure link is FE */
1853                 if (!fe->dai_link->dynamic)
1854                         continue;
1855
1856                 /* only check active links */
1857                 if (!fe->cpu_dai->active)
1858                         continue;
1859
1860                 /* DAPM sync will call this to update DSP paths */
1861                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
1862                         fe->dai_link->name);
1863
1864                 /* skip if FE doesn't have playback capability */
1865                 if (!fe->cpu_dai->driver->playback.channels_min)
1866                         goto capture;
1867
1868                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1869                 if (paths < 0) {
1870                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1871                                         fe->dai_link->name,  "playback");
1872                         mutex_unlock(&card->mutex);
1873                         return paths;
1874                 }
1875
1876                 /* update any new playback paths */
1877                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1878                 if (new) {
1879                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1880                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1881                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1882                 }
1883
1884                 /* update any old playback paths */
1885                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1886                 if (old) {
1887                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1888                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1889                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1890                 }
1891
1892 capture:
1893                 /* skip if FE doesn't have capture capability */
1894                 if (!fe->cpu_dai->driver->capture.channels_min)
1895                         continue;
1896
1897                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1898                 if (paths < 0) {
1899                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1900                                         fe->dai_link->name,  "capture");
1901                         mutex_unlock(&card->mutex);
1902                         return paths;
1903                 }
1904
1905                 /* update any new capture paths */
1906                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1907                 if (new) {
1908                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1909                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1910                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1911                 }
1912
1913                 /* update any old capture paths */
1914                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1915                 if (old) {
1916                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1917                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1918                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1919                 }
1920
1921                 dpcm_path_put(&list);
1922         }
1923
1924         mutex_unlock(&card->mutex);
1925         return 0;
1926 }
1927 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1928 {
1929         struct snd_soc_dpcm *dpcm;
1930         struct list_head *clients =
1931                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1932
1933         list_for_each_entry(dpcm, clients, list_be) {
1934
1935                 struct snd_soc_pcm_runtime *be = dpcm->be;
1936                 struct snd_soc_dai *dai = be->codec_dai;
1937                 struct snd_soc_dai_driver *drv = dai->driver;
1938
1939                 if (be->dai_link->ignore_suspend)
1940                         continue;
1941
1942                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
1943
1944                 if (drv->ops->digital_mute && dai->playback_active)
1945                                 drv->ops->digital_mute(dai, mute);
1946         }
1947
1948         return 0;
1949 }
1950
1951 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1952 {
1953         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1954         struct snd_soc_dpcm *dpcm;
1955         struct snd_soc_dapm_widget_list *list;
1956         int ret;
1957         int stream = fe_substream->stream;
1958
1959         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1960         fe->dpcm[stream].runtime = fe_substream->runtime;
1961
1962         if (dpcm_path_get(fe, stream, &list) <= 0) {
1963                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
1964                         fe->dai_link->name, stream ? "capture" : "playback");
1965         }
1966
1967         /* calculate valid and active FE <-> BE dpcms */
1968         dpcm_process_paths(fe, stream, &list, 1);
1969
1970         ret = dpcm_fe_dai_startup(fe_substream);
1971         if (ret < 0) {
1972                 /* clean up all links */
1973                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1974                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1975
1976                 dpcm_be_disconnect(fe, stream);
1977                 fe->dpcm[stream].runtime = NULL;
1978         }
1979
1980         dpcm_clear_pending_state(fe, stream);
1981         dpcm_path_put(&list);
1982         mutex_unlock(&fe->card->mutex);
1983         return ret;
1984 }
1985
1986 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1987 {
1988         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1989         struct snd_soc_dpcm *dpcm;
1990         int stream = fe_substream->stream, ret;
1991
1992         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1993         ret = dpcm_fe_dai_shutdown(fe_substream);
1994
1995         /* mark FE's links ready to prune */
1996         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1997                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1998
1999         dpcm_be_disconnect(fe, stream);
2000
2001         fe->dpcm[stream].runtime = NULL;
2002         mutex_unlock(&fe->card->mutex);
2003         return ret;
2004 }
2005
2006 /* create a new pcm */
2007 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2008 {
2009         struct snd_soc_platform *platform = rtd->platform;
2010         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2011         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2012         struct snd_pcm *pcm;
2013         char new_name[64];
2014         int ret = 0, playback = 0, capture = 0;
2015
2016         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2017                 if (cpu_dai->driver->playback.channels_min)
2018                         playback = 1;
2019                 if (cpu_dai->driver->capture.channels_min)
2020                         capture = 1;
2021         } else {
2022                 if (codec_dai->driver->playback.channels_min &&
2023                     cpu_dai->driver->playback.channels_min)
2024                         playback = 1;
2025                 if (codec_dai->driver->capture.channels_min &&
2026                     cpu_dai->driver->capture.channels_min)
2027                         capture = 1;
2028         }
2029
2030         /* create the PCM */
2031         if (rtd->dai_link->no_pcm) {
2032                 snprintf(new_name, sizeof(new_name), "(%s)",
2033                         rtd->dai_link->stream_name);
2034
2035                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2036                                 playback, capture, &pcm);
2037         } else {
2038                 if (rtd->dai_link->dynamic)
2039                         snprintf(new_name, sizeof(new_name), "%s (*)",
2040                                 rtd->dai_link->stream_name);
2041                 else
2042                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2043                                 rtd->dai_link->stream_name, codec_dai->name, num);
2044
2045                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2046                         capture, &pcm);
2047         }
2048         if (ret < 0) {
2049                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2050                         rtd->dai_link->name);
2051                 return ret;
2052         }
2053         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2054
2055         /* DAPM dai link stream work */
2056         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2057
2058         rtd->pcm = pcm;
2059         pcm->private_data = rtd;
2060
2061         if (rtd->dai_link->no_pcm) {
2062                 if (playback)
2063                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2064                 if (capture)
2065                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2066                 goto out;
2067         }
2068
2069         /* ASoC PCM operations */
2070         if (rtd->dai_link->dynamic) {
2071                 rtd->ops.open           = dpcm_fe_dai_open;
2072                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2073                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2074                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2075                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2076                 rtd->ops.close          = dpcm_fe_dai_close;
2077                 rtd->ops.pointer        = soc_pcm_pointer;
2078                 rtd->ops.ioctl          = soc_pcm_ioctl;
2079         } else {
2080                 rtd->ops.open           = soc_pcm_open;
2081                 rtd->ops.hw_params      = soc_pcm_hw_params;
2082                 rtd->ops.prepare        = soc_pcm_prepare;
2083                 rtd->ops.trigger        = soc_pcm_trigger;
2084                 rtd->ops.hw_free        = soc_pcm_hw_free;
2085                 rtd->ops.close          = soc_pcm_close;
2086                 rtd->ops.pointer        = soc_pcm_pointer;
2087                 rtd->ops.ioctl          = soc_pcm_ioctl;
2088         }
2089
2090         if (platform->driver->ops) {
2091                 rtd->ops.ack            = platform->driver->ops->ack;
2092                 rtd->ops.copy           = platform->driver->ops->copy;
2093                 rtd->ops.silence        = platform->driver->ops->silence;
2094                 rtd->ops.page           = platform->driver->ops->page;
2095                 rtd->ops.mmap           = platform->driver->ops->mmap;
2096         }
2097
2098         if (playback)
2099                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2100
2101         if (capture)
2102                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2103
2104         if (platform->driver->pcm_new) {
2105                 ret = platform->driver->pcm_new(rtd);
2106                 if (ret < 0) {
2107                         dev_err(platform->dev,
2108                                 "ASoC: pcm constructor failed: %d\n",
2109                                 ret);
2110                         return ret;
2111                 }
2112         }
2113
2114         pcm->private_free = platform->driver->pcm_free;
2115 out:
2116         dev_info(rtd->card->dev, " %s <-> %s mapping ok\n", codec_dai->name,
2117                 cpu_dai->name);
2118         return ret;
2119 }
2120
2121 /* is the current PCM operation for this FE ? */
2122 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2123 {
2124         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2125                 return 1;
2126         return 0;
2127 }
2128 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2129
2130 /* is the current PCM operation for this BE ? */
2131 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2132                 struct snd_soc_pcm_runtime *be, int stream)
2133 {
2134         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2135            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2136                   be->dpcm[stream].runtime_update))
2137                 return 1;
2138         return 0;
2139 }
2140 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2141
2142 /* get the substream for this BE */
2143 struct snd_pcm_substream *
2144         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2145 {
2146         return be->pcm->streams[stream].substream;
2147 }
2148 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2149
2150 /* get the BE runtime state */
2151 enum snd_soc_dpcm_state
2152         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2153 {
2154         return be->dpcm[stream].state;
2155 }
2156 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2157
2158 /* set the BE runtime state */
2159 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2160                 int stream, enum snd_soc_dpcm_state state)
2161 {
2162         be->dpcm[stream].state = state;
2163 }
2164 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2165
2166 /*
2167  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2168  * are not running, paused or suspended for the specified stream direction.
2169  */
2170 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2171                 struct snd_soc_pcm_runtime *be, int stream)
2172 {
2173         struct snd_soc_dpcm *dpcm;
2174         int state;
2175
2176         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2177
2178                 if (dpcm->fe == fe)
2179                         continue;
2180
2181                 state = dpcm->fe->dpcm[stream].state;
2182                 if (state == SND_SOC_DPCM_STATE_START ||
2183                         state == SND_SOC_DPCM_STATE_PAUSED ||
2184                         state == SND_SOC_DPCM_STATE_SUSPEND)
2185                         return 0;
2186         }
2187
2188         /* it's safe to free/stop this BE DAI */
2189         return 1;
2190 }
2191 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2192
2193 /*
2194  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2195  * running, paused or suspended for the specified stream direction.
2196  */
2197 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2198                 struct snd_soc_pcm_runtime *be, int stream)
2199 {
2200         struct snd_soc_dpcm *dpcm;
2201         int state;
2202
2203         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2204
2205                 if (dpcm->fe == fe)
2206                         continue;
2207
2208                 state = dpcm->fe->dpcm[stream].state;
2209                 if (state == SND_SOC_DPCM_STATE_START ||
2210                         state == SND_SOC_DPCM_STATE_PAUSED ||
2211                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2212                         state == SND_SOC_DPCM_STATE_PREPARE)
2213                         return 0;
2214         }
2215
2216         /* it's safe to change hw_params */
2217         return 1;
2218 }
2219 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2220
2221 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2222                 int cmd, struct snd_soc_platform *platform)
2223 {
2224         if (platform->driver->ops->trigger)
2225                 return platform->driver->ops->trigger(substream, cmd);
2226         return 0;
2227 }
2228 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2229
2230 #ifdef CONFIG_DEBUG_FS
2231 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2232 {
2233         switch (state) {
2234         case SND_SOC_DPCM_STATE_NEW:
2235                 return "new";
2236         case SND_SOC_DPCM_STATE_OPEN:
2237                 return "open";
2238         case SND_SOC_DPCM_STATE_HW_PARAMS:
2239                 return "hw_params";
2240         case SND_SOC_DPCM_STATE_PREPARE:
2241                 return "prepare";
2242         case SND_SOC_DPCM_STATE_START:
2243                 return "start";
2244         case SND_SOC_DPCM_STATE_STOP:
2245                 return "stop";
2246         case SND_SOC_DPCM_STATE_SUSPEND:
2247                 return "suspend";
2248         case SND_SOC_DPCM_STATE_PAUSED:
2249                 return "paused";
2250         case SND_SOC_DPCM_STATE_HW_FREE:
2251                 return "hw_free";
2252         case SND_SOC_DPCM_STATE_CLOSE:
2253                 return "close";
2254         }
2255
2256         return "unknown";
2257 }
2258
2259 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2260                                 int stream, char *buf, size_t size)
2261 {
2262         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2263         struct snd_soc_dpcm *dpcm;
2264         ssize_t offset = 0;
2265
2266         /* FE state */
2267         offset += snprintf(buf + offset, size - offset,
2268                         "[%s - %s]\n", fe->dai_link->name,
2269                         stream ? "Capture" : "Playback");
2270
2271         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2272                         dpcm_state_string(fe->dpcm[stream].state));
2273
2274         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2275             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2276                 offset += snprintf(buf + offset, size - offset,
2277                                 "Hardware Params: "
2278                                 "Format = %s, Channels = %d, Rate = %d\n",
2279                                 snd_pcm_format_name(params_format(params)),
2280                                 params_channels(params),
2281                                 params_rate(params));
2282
2283         /* BEs state */
2284         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2285
2286         if (list_empty(&fe->dpcm[stream].be_clients)) {
2287                 offset += snprintf(buf + offset, size - offset,
2288                                 " No active DSP links\n");
2289                 goto out;
2290         }
2291
2292         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2293                 struct snd_soc_pcm_runtime *be = dpcm->be;
2294                 params = &dpcm->hw_params;
2295
2296                 offset += snprintf(buf + offset, size - offset,
2297                                 "- %s\n", be->dai_link->name);
2298
2299                 offset += snprintf(buf + offset, size - offset,
2300                                 "   State: %s\n",
2301                                 dpcm_state_string(be->dpcm[stream].state));
2302
2303                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2304                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2305                         offset += snprintf(buf + offset, size - offset,
2306                                 "   Hardware Params: "
2307                                 "Format = %s, Channels = %d, Rate = %d\n",
2308                                 snd_pcm_format_name(params_format(params)),
2309                                 params_channels(params),
2310                                 params_rate(params));
2311         }
2312
2313 out:
2314         return offset;
2315 }
2316
2317 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2318                                 size_t count, loff_t *ppos)
2319 {
2320         struct snd_soc_pcm_runtime *fe = file->private_data;
2321         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2322         char *buf;
2323
2324         buf = kmalloc(out_count, GFP_KERNEL);
2325         if (!buf)
2326                 return -ENOMEM;
2327
2328         if (fe->cpu_dai->driver->playback.channels_min)
2329                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2330                                         buf + offset, out_count - offset);
2331
2332         if (fe->cpu_dai->driver->capture.channels_min)
2333                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2334                                         buf + offset, out_count - offset);
2335
2336         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2337
2338         kfree(buf);
2339         return ret;
2340 }
2341
2342 static const struct file_operations dpcm_state_fops = {
2343         .open = simple_open,
2344         .read = dpcm_state_read_file,
2345         .llseek = default_llseek,
2346 };
2347
2348 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2349 {
2350         if (!rtd->dai_link)
2351                 return 0;
2352
2353         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2354                         rtd->card->debugfs_card_root);
2355         if (!rtd->debugfs_dpcm_root) {
2356                 dev_dbg(rtd->dev,
2357                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2358                          rtd->dai_link->name);
2359                 return -EINVAL;
2360         }
2361
2362         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2363                                                 rtd->debugfs_dpcm_root,
2364                                                 rtd, &dpcm_state_fops);
2365
2366         return 0;
2367 }
2368 #endif