sound/soc/soc-pcm.c

   1 /*
   2  * soc-pcm.c  --  ALSA SoC PCM
   3  *
   4  * Copyright 2005 Wolfson Microelectronics PLC.
   5  * Copyright 2005 Openedhand Ltd.
   6  * Copyright (C) 2010 Slimlogic Ltd.
   7  * Copyright (C) 2010 Texas Instruments Inc.
   8  *
   9  * Authors: Liam Girdwood <lrg@ti.com>
  10  *          Mark Brown <broonie@opensource.wolfsonmicro.com>
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/slab.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/export.h>
  26 #include <linux/debugfs.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31 #include <sound/soc-dpcm.h>
  32 #include <sound/initval.h>
  33
  34 #define DPCM_MAX_BE_USERS       8
  35
  36 /* DPCM stream event, send event to FE and all active BEs. */
  37 static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
  38         int event)
  39 {
  40         struct snd_soc_dpcm *dpcm;
  41
  42         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
  43
  44                 struct snd_soc_pcm_runtime *be = dpcm->be;
  45
  46                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
  47                                 be->dai_link->name, event, dir);
  48
  49                 snd_soc_dapm_stream_event(be, dir, event);
  50         }
  51
  52         snd_soc_dapm_stream_event(fe, dir, event);
  53
  54         return 0;
  55 }
  56
  57 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
  58                                         struct snd_soc_dai *soc_dai)
  59 {
  60         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  61         int ret;
  62
  63         if (!soc_dai->driver->symmetric_rates &&
  64             !rtd->dai_link->symmetric_rates)
  65                 return 0;
  66
  67         /* This can happen if multiple streams are starting simultaneously -
  68          * the second can need to get its constraints before the first has
  69          * picked a rate.  Complain and allow the application to carry on.
  70          */
  71         if (!soc_dai->rate) {
  72                 dev_warn(soc_dai->dev,
  73                          "ASoC: Not enforcing symmetric_rates due to race\n");
  74                 return 0;
  75         }
  76
  77         dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n", soc_dai->rate);
  78
  79         ret = snd_pcm_hw_constraint_minmax(substream->runtime,
  80                                            SNDRV_PCM_HW_PARAM_RATE,
  81                                            soc_dai->rate, soc_dai->rate);
  82         if (ret < 0) {
  83                 dev_err(soc_dai->dev,
  84                         "ASoC: Unable to apply rate symmetry constraint: %d\n",
  85                         ret);
  86                 return ret;
  87         }
  88
  89         return 0;
  90 }
  91
  92 /*
  93  * List of sample sizes that might go over the bus for parameter
  94  * application.  There ought to be a wildcard sample size for things
  95  * like the DAC/ADC resolution to use but there isn't right now.
  96  */
  97 static int sample_sizes[] = {
  98         24, 32,
  99 };
 100
 101 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
 102                               struct snd_soc_dai *dai)
 103 {
 104         int ret, i, bits;
 105
 106         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 107                 bits = dai->driver->playback.sig_bits;
 108         else
 109                 bits = dai->driver->capture.sig_bits;
 110
 111         if (!bits)
 112                 return;
 113
 114         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
 115                 if (bits >= sample_sizes[i])
 116                         continue;
 117
 118                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
 119                                                    sample_sizes[i], bits);
 120                 if (ret != 0)
 121                         dev_warn(dai->dev,
 122                                  "ASoC: Failed to set MSB %d/%d: %d\n",
 123                                  bits, sample_sizes[i], ret);
 124         }
 125 }
 126
 127 /*
 128  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 129  * then initialized and any private data can be allocated. This also calls
 130  * startup for the cpu DAI, platform, machine and codec DAI.
 131  */
 132 static int soc_pcm_open(struct snd_pcm_substream *substream)
 133 {
 134         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 135         struct snd_pcm_runtime *runtime = substream->runtime;
 136         struct snd_soc_platform *platform = rtd->platform;
 137         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 138         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 139         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
 140         struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
 141         int ret = 0;
 142
 143         pm_runtime_get_sync(cpu_dai->dev);
 144         pm_runtime_get_sync(codec_dai->dev);
 145         pm_runtime_get_sync(platform->dev);
 146
 147         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 148
 149         /* startup the audio subsystem */
 150         if (cpu_dai->driver->ops->startup) {
 151                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 152                 if (ret < 0) {
 153                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 154                                 " %s: %d\n", cpu_dai->name, ret);
 155                         goto out;
 156                 }
 157         }
 158
 159         if (platform->driver->ops && platform->driver->ops->open) {
 160                 ret = platform->driver->ops->open(substream);
 161                 if (ret < 0) {
 162                         dev_err(platform->dev, "ASoC: can't open platform"
 163                                 " %s: %d\n", platform->name, ret);
 164                         goto platform_err;
 165                 }
 166         }
 167
 168         if (codec_dai->driver->ops->startup) {
 169                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
 170                 if (ret < 0) {
 171                         dev_err(codec_dai->dev, "ASoC: can't open codec"
 172                                 " %s: %d\n", codec_dai->name, ret);
 173                         goto codec_dai_err;
 174                 }
 175         }
 176
 177         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 178                 ret = rtd->dai_link->ops->startup(substream);
 179                 if (ret < 0) {
 180                         pr_err("ASoC: %s startup failed: %d\n",
 181                                rtd->dai_link->name, ret);
 182                         goto machine_err;
 183                 }
 184         }
 185
 186         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 187         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 188                 goto dynamic;
 189
 190         /* Check that the codec and cpu DAIs are compatible */
 191         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 192                 runtime->hw.rate_min =
 193                         max(codec_dai_drv->playback.rate_min,
 194                             cpu_dai_drv->playback.rate_min);
 195                 runtime->hw.rate_max =
 196                         min(codec_dai_drv->playback.rate_max,
 197                             cpu_dai_drv->playback.rate_max);
 198                 runtime->hw.channels_min =
 199                         max(codec_dai_drv->playback.channels_min,
 200                                 cpu_dai_drv->playback.channels_min);
 201                 runtime->hw.channels_max =
 202                         min(codec_dai_drv->playback.channels_max,
 203                                 cpu_dai_drv->playback.channels_max);
 204                 runtime->hw.formats =
 205                         codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
 206                 runtime->hw.rates =
 207                         codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
 208                 if (codec_dai_drv->playback.rates
 209                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 210                         runtime->hw.rates |= cpu_dai_drv->playback.rates;
 211                 if (cpu_dai_drv->playback.rates
 212                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 213                         runtime->hw.rates |= codec_dai_drv->playback.rates;
 214         } else {
 215                 runtime->hw.rate_min =
 216                         max(codec_dai_drv->capture.rate_min,
 217                             cpu_dai_drv->capture.rate_min);
 218                 runtime->hw.rate_max =
 219                         min(codec_dai_drv->capture.rate_max,
 220                             cpu_dai_drv->capture.rate_max);
 221                 runtime->hw.channels_min =
 222                         max(codec_dai_drv->capture.channels_min,
 223                                 cpu_dai_drv->capture.channels_min);
 224                 runtime->hw.channels_max =
 225                         min(codec_dai_drv->capture.channels_max,
 226                                 cpu_dai_drv->capture.channels_max);
 227                 runtime->hw.formats =
 228                         codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
 229                 runtime->hw.rates =
 230                         codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
 231                 if (codec_dai_drv->capture.rates
 232                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 233                         runtime->hw.rates |= cpu_dai_drv->capture.rates;
 234                 if (cpu_dai_drv->capture.rates
 235                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 236                         runtime->hw.rates |= codec_dai_drv->capture.rates;
 237         }
 238
 239         ret = -EINVAL;
 240         snd_pcm_limit_hw_rates(runtime);
 241         if (!runtime->hw.rates) {
 242                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 243                         codec_dai->name, cpu_dai->name);
 244                 goto config_err;
 245         }
 246         if (!runtime->hw.formats) {
 247                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 248                         codec_dai->name, cpu_dai->name);
 249                 goto config_err;
 250         }
 251         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 252             runtime->hw.channels_min > runtime->hw.channels_max) {
 253                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 254                                 codec_dai->name, cpu_dai->name);
 255                 goto config_err;
 256         }
 257
 258         soc_pcm_apply_msb(substream, codec_dai);
 259         soc_pcm_apply_msb(substream, cpu_dai);
 260
 261         /* Symmetry only applies if we've already got an active stream. */
 262         if (cpu_dai->active) {
 263                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 264                 if (ret != 0)
 265                         goto config_err;
 266         }
 267
 268         if (codec_dai->active) {
 269                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
 270                 if (ret != 0)
 271                         goto config_err;
 272         }
 273
 274         pr_debug("ASoC: %s <-> %s info:\n",
 275                         codec_dai->name, cpu_dai->name);
 276         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 277         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 278                  runtime->hw.channels_max);
 279         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 280                  runtime->hw.rate_max);
 281
 282 dynamic:
 283         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 284                 cpu_dai->playback_active++;
 285                 codec_dai->playback_active++;
 286         } else {
 287                 cpu_dai->capture_active++;
 288                 codec_dai->capture_active++;
 289         }
 290         cpu_dai->active++;
 291         codec_dai->active++;
 292         rtd->codec->active++;
 293         mutex_unlock(&rtd->pcm_mutex);
 294         return 0;
 295
 296 config_err:
 297         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 298                 rtd->dai_link->ops->shutdown(substream);
 299
 300 machine_err:
 301         if (codec_dai->driver->ops->shutdown)
 302                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 303
 304 codec_dai_err:
 305         if (platform->driver->ops && platform->driver->ops->close)
 306                 platform->driver->ops->close(substream);
 307
 308 platform_err:
 309         if (cpu_dai->driver->ops->shutdown)
 310                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 311 out:
 312         mutex_unlock(&rtd->pcm_mutex);
 313
 314         pm_runtime_put(platform->dev);
 315         pm_runtime_put(codec_dai->dev);
 316         pm_runtime_put(cpu_dai->dev);
 317
 318         return ret;
 319 }
 320
 321 /*
 322  * Power down the audio subsystem pmdown_time msecs after close is called.
 323  * This is to ensure there are no pops or clicks in between any music tracks
 324  * due to DAPM power cycling.
 325  */
 326 static void close_delayed_work(struct work_struct *work)
 327 {
 328         struct snd_soc_pcm_runtime *rtd =
 329                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 330         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 331
 332         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 333
 334         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 335                  codec_dai->driver->playback.stream_name,
 336                  codec_dai->playback_active ? "active" : "inactive",
 337                  rtd->pop_wait ? "yes" : "no");
 338
 339         /* are we waiting on this codec DAI stream */
 340         if (rtd->pop_wait == 1) {
 341                 rtd->pop_wait = 0;
 342                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 343                                           SND_SOC_DAPM_STREAM_STOP);
 344         }
 345
 346         mutex_unlock(&rtd->pcm_mutex);
 347 }
 348
 349 /*
 350  * Called by ALSA when a PCM substream is closed. Private data can be
 351  * freed here. The cpu DAI, codec DAI, machine and platform are also
 352  * shutdown.
 353  */
 354 static int soc_pcm_close(struct snd_pcm_substream *substream)
 355 {
 356         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 357         struct snd_soc_platform *platform = rtd->platform;
 358         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 359         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 360         struct snd_soc_codec *codec = rtd->codec;
 361
 362         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 363
 364         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 365                 cpu_dai->playback_active--;
 366                 codec_dai->playback_active--;
 367         } else {
 368                 cpu_dai->capture_active--;
 369                 codec_dai->capture_active--;
 370         }
 371
 372         cpu_dai->active--;
 373         codec_dai->active--;
 374         codec->active--;
 375
 376         /* clear the corresponding DAIs rate when inactive */
 377         if (!cpu_dai->active)
 378                 cpu_dai->rate = 0;
 379
 380         if (!codec_dai->active)
 381                 codec_dai->rate = 0;
 382
 383         /* Muting the DAC suppresses artifacts caused during digital
 384          * shutdown, for example from stopping clocks.
 385          */
 386         snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
 387
 388         if (cpu_dai->driver->ops->shutdown)
 389                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 390
 391         if (codec_dai->driver->ops->shutdown)
 392                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 393
 394         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 395                 rtd->dai_link->ops->shutdown(substream);
 396
 397         if (platform->driver->ops && platform->driver->ops->close)
 398                 platform->driver->ops->close(substream);
 399         cpu_dai->runtime = NULL;
 400
 401         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 402                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 403                     rtd->dai_link->ignore_pmdown_time) {
 404                         /* powered down playback stream now */
 405                         snd_soc_dapm_stream_event(rtd,
 406                                                   SNDRV_PCM_STREAM_PLAYBACK,
 407                                                   SND_SOC_DAPM_STREAM_STOP);
 408                 } else {
 409                         /* start delayed pop wq here for playback streams */
 410                         rtd->pop_wait = 1;
 411                         schedule_delayed_work(&rtd->delayed_work,
 412                                 msecs_to_jiffies(rtd->pmdown_time));
 413                 }
 414         } else {
 415                 /* capture streams can be powered down now */
 416                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 417                                           SND_SOC_DAPM_STREAM_STOP);
 418         }
 419
 420         mutex_unlock(&rtd->pcm_mutex);
 421
 422         pm_runtime_put(platform->dev);
 423         pm_runtime_put(codec_dai->dev);
 424         pm_runtime_put(cpu_dai->dev);
 425
 426         return 0;
 427 }
 428
 429 /*
 430  * Called by ALSA when the PCM substream is prepared, can set format, sample
 431  * rate, etc.  This function is non atomic and can be called multiple times,
 432  * it can refer to the runtime info.
 433  */
 434 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 435 {
 436         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 437         struct snd_soc_platform *platform = rtd->platform;
 438         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 439         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 440         int ret = 0;
 441
 442         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 443
 444         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 445                 ret = rtd->dai_link->ops->prepare(substream);
 446                 if (ret < 0) {
 447                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 448                                 " %d\n", ret);
 449                         goto out;
 450                 }
 451         }
 452
 453         if (platform->driver->ops && platform->driver->ops->prepare) {
 454                 ret = platform->driver->ops->prepare(substream);
 455                 if (ret < 0) {
 456                         dev_err(platform->dev, "ASoC: platform prepare error:"
 457                                 " %d\n", ret);
 458                         goto out;
 459                 }
 460         }
 461
 462         if (codec_dai->driver->ops->prepare) {
 463                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
 464                 if (ret < 0) {
 465                         dev_err(codec_dai->dev, "ASoC: DAI prepare error: %d\n",
 466                                 ret);
 467                         goto out;
 468                 }
 469         }
 470
 471         if (cpu_dai->driver->ops->prepare) {
 472                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 473                 if (ret < 0) {
 474                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
 475                                 ret);
 476                         goto out;
 477                 }
 478         }
 479
 480         /* cancel any delayed stream shutdown that is pending */
 481         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 482             rtd->pop_wait) {
 483                 rtd->pop_wait = 0;
 484                 cancel_delayed_work(&rtd->delayed_work);
 485         }
 486
 487         snd_soc_dapm_stream_event(rtd, substream->stream,
 488                         SND_SOC_DAPM_STREAM_START);
 489
 490         snd_soc_dai_digital_mute(codec_dai, 0, substream->stream);
 491
 492 out:
 493         mutex_unlock(&rtd->pcm_mutex);
 494         return ret;
 495 }
 496
 497 /*
 498  * Called by ALSA when the hardware params are set by application. This
 499  * function can also be called multiple times and can allocate buffers
 500  * (using snd_pcm_lib_* ). It's non-atomic.
 501  */
 502 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 503                                 struct snd_pcm_hw_params *params)
 504 {
 505         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 506         struct snd_soc_platform *platform = rtd->platform;
 507         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 508         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 509         int ret = 0;
 510
 511         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 512
 513         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 514                 ret = rtd->dai_link->ops->hw_params(substream, params);
 515                 if (ret < 0) {
 516                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 517                                 " failed: %d\n", ret);
 518                         goto out;
 519                 }
 520         }
 521
 522         if (codec_dai->driver->ops->hw_params) {
 523                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
 524                 if (ret < 0) {
 525                         dev_err(codec_dai->dev, "ASoC: can't set %s hw params:"
 526                                 " %d\n", codec_dai->name, ret);
 527                         goto codec_err;
 528                 }
 529         }
 530
 531         if (cpu_dai->driver->ops->hw_params) {
 532                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
 533                 if (ret < 0) {
 534                         dev_err(cpu_dai->dev, "ASoC: %s hw params failed: %d\n",
 535                                 cpu_dai->name, ret);
 536                         goto interface_err;
 537                 }
 538         }
 539
 540         if (platform->driver->ops && platform->driver->ops->hw_params) {
 541                 ret = platform->driver->ops->hw_params(substream, params);
 542                 if (ret < 0) {
 543                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 544                                platform->name, ret);
 545                         goto platform_err;
 546                 }
 547         }
 548
 549         /* store the rate for each DAIs */
 550         cpu_dai->rate = params_rate(params);
 551         codec_dai->rate = params_rate(params);
 552
 553 out:
 554         mutex_unlock(&rtd->pcm_mutex);
 555         return ret;
 556
 557 platform_err:
 558         if (cpu_dai->driver->ops->hw_free)
 559                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 560
 561 interface_err:
 562         if (codec_dai->driver->ops->hw_free)
 563                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 564
 565 codec_err:
 566         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 567                 rtd->dai_link->ops->hw_free(substream);
 568
 569         mutex_unlock(&rtd->pcm_mutex);
 570         return ret;
 571 }
 572
 573 /*
 574  * Frees resources allocated by hw_params, can be called multiple times
 575  */
 576 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 577 {
 578         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 579         struct snd_soc_platform *platform = rtd->platform;
 580         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 581         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 582         struct snd_soc_codec *codec = rtd->codec;
 583
 584         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 585
 586         /* apply codec digital mute */
 587         if (!codec->active)
 588                 snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
 589
 590         /* free any machine hw params */
 591         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 592                 rtd->dai_link->ops->hw_free(substream);
 593
 594         /* free any DMA resources */
 595         if (platform->driver->ops && platform->driver->ops->hw_free)
 596                 platform->driver->ops->hw_free(substream);
 597
 598         /* now free hw params for the DAIs  */
 599         if (codec_dai->driver->ops->hw_free)
 600                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 601
 602         if (cpu_dai->driver->ops->hw_free)
 603                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 604
 605         mutex_unlock(&rtd->pcm_mutex);
 606         return 0;
 607 }
 608
 609 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 610 {
 611         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 612         struct snd_soc_platform *platform = rtd->platform;
 613         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 614         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 615         int ret;
 616
 617         if (codec_dai->driver->ops->trigger) {
 618                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
 619                 if (ret < 0)
 620                         return ret;
 621         }
 622
 623         if (platform->driver->ops && platform->driver->ops->trigger) {
 624                 ret = platform->driver->ops->trigger(substream, cmd);
 625                 if (ret < 0)
 626                         return ret;
 627         }
 628
 629         if (cpu_dai->driver->ops->trigger) {
 630                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 631                 if (ret < 0)
 632                         return ret;
 633         }
 634         return 0;
 635 }
 636
 637 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
 638                                    int cmd)
 639 {
 640         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 641         struct snd_soc_platform *platform = rtd->platform;
 642         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 643         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 644         int ret;
 645
 646         if (codec_dai->driver->ops->bespoke_trigger) {
 647                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
 648                 if (ret < 0)
 649                         return ret;
 650         }
 651
 652         if (platform->driver->bespoke_trigger) {
 653                 ret = platform->driver->bespoke_trigger(substream, cmd);
 654                 if (ret < 0)
 655                         return ret;
 656         }
 657
 658         if (cpu_dai->driver->ops->bespoke_trigger) {
 659                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
 660                 if (ret < 0)
 661                         return ret;
 662         }
 663         return 0;
 664 }
 665 /*
 666  * soc level wrapper for pointer callback
 667  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 668  * the runtime->delay will be updated accordingly.
 669  */
 670 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 671 {
 672         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 673         struct snd_soc_platform *platform = rtd->platform;
 674         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 675         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 676         struct snd_pcm_runtime *runtime = substream->runtime;
 677         snd_pcm_uframes_t offset = 0;
 678         snd_pcm_sframes_t delay = 0;
 679
 680         if (platform->driver->ops && platform->driver->ops->pointer)
 681                 offset = platform->driver->ops->pointer(substream);
 682
 683         if (cpu_dai->driver->ops->delay)
 684                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 685
 686         if (codec_dai->driver->ops->delay)
 687                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 688
 689         if (platform->driver->delay)
 690                 delay += platform->driver->delay(substream, codec_dai);
 691
 692         runtime->delay = delay;
 693
 694         return offset;
 695 }
 696
 697 /* connect a FE and BE */
 698 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
 699                 struct snd_soc_pcm_runtime *be, int stream)
 700 {
 701         struct snd_soc_dpcm *dpcm;
 702
 703         /* only add new dpcms */
 704         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 705                 if (dpcm->be == be && dpcm->fe == fe)
 706                         return 0;
 707         }
 708
 709         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
 710         if (!dpcm)
 711                 return -ENOMEM;
 712
 713         dpcm->be = be;
 714         dpcm->fe = fe;
 715         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
 716         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
 717         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
 718         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
 719
 720         dev_dbg(fe->dev, "  connected new DPCM %s path %s %s %s\n",
 721                         stream ? "capture" : "playback",  fe->dai_link->name,
 722                         stream ? "<-" : "->", be->dai_link->name);
 723
 724 #ifdef CONFIG_DEBUG_FS
 725         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
 726                         fe->debugfs_dpcm_root, &dpcm->state);
 727 #endif
 728         return 1;
 729 }
 730
 731 /* reparent a BE onto another FE */
 732 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
 733                         struct snd_soc_pcm_runtime *be, int stream)
 734 {
 735         struct snd_soc_dpcm *dpcm;
 736         struct snd_pcm_substream *fe_substream, *be_substream;
 737
 738         /* reparent if BE is connected to other FEs */
 739         if (!be->dpcm[stream].users)
 740                 return;
 741
 742         be_substream = snd_soc_dpcm_get_substream(be, stream);
 743
 744         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
 745                 if (dpcm->fe == fe)
 746                         continue;
 747
 748                 dev_dbg(fe->dev, "  reparent %s path %s %s %s\n",
 749                         stream ? "capture" : "playback",
 750                         dpcm->fe->dai_link->name,
 751                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 752
 753                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
 754                 be_substream->runtime = fe_substream->runtime;
 755                 break;
 756         }
 757 }
 758
 759 /* disconnect a BE and FE */
 760 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
 761 {
 762         struct snd_soc_dpcm *dpcm, *d;
 763
 764         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
 765                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
 766                                 stream ? "capture" : "playback",
 767                                 dpcm->be->dai_link->name);
 768
 769                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
 770                         continue;
 771
 772                 dev_dbg(fe->dev, "  freed DSP %s path %s %s %s\n",
 773                         stream ? "capture" : "playback", fe->dai_link->name,
 774                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 775
 776                 /* BEs still alive need new FE */
 777                 dpcm_be_reparent(fe, dpcm->be, stream);
 778
 779 #ifdef CONFIG_DEBUG_FS
 780                 debugfs_remove(dpcm->debugfs_state);
 781 #endif
 782                 list_del(&dpcm->list_be);
 783                 list_del(&dpcm->list_fe);
 784                 kfree(dpcm);
 785         }
 786 }
 787
 788 /* get BE for DAI widget and stream */
 789 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
 790                 struct snd_soc_dapm_widget *widget, int stream)
 791 {
 792         struct snd_soc_pcm_runtime *be;
 793         int i;
 794
 795         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 796                 for (i = 0; i < card->num_links; i++) {
 797                         be = &card->rtd[i];
 798
 799                         if (!be->dai_link->no_pcm)
 800                                 continue;
 801
 802                         if (be->cpu_dai->playback_widget == widget ||
 803                                 be->codec_dai->playback_widget == widget)
 804                                 return be;
 805                 }
 806         } else {
 807
 808                 for (i = 0; i < card->num_links; i++) {
 809                         be = &card->rtd[i];
 810
 811                         if (!be->dai_link->no_pcm)
 812                                 continue;
 813
 814                         if (be->cpu_dai->capture_widget == widget ||
 815                                 be->codec_dai->capture_widget == widget)
 816                                 return be;
 817                 }
 818         }
 819
 820         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
 821                 stream ? "capture" : "playback", widget->name);
 822         return NULL;
 823 }
 824
 825 static inline struct snd_soc_dapm_widget *
 826         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 827 {
 828         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 829                 return rtd->cpu_dai->playback_widget;
 830         else
 831                 return rtd->cpu_dai->capture_widget;
 832 }
 833
 834 static inline struct snd_soc_dapm_widget *
 835         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 836 {
 837         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 838                 return rtd->codec_dai->playback_widget;
 839         else
 840                 return rtd->codec_dai->capture_widget;
 841 }
 842
 843 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 844                 struct snd_soc_dapm_widget *widget)
 845 {
 846         int i;
 847
 848         for (i = 0; i < list->num_widgets; i++) {
 849                 if (widget == list->widgets[i])
 850                         return 1;
 851         }
 852
 853         return 0;
 854 }
 855
 856 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 857         int stream, struct snd_soc_dapm_widget_list **list_)
 858 {
 859         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
 860         struct snd_soc_dapm_widget_list *list;
 861         int paths;
 862
 863         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
 864                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
 865         if (list == NULL)
 866                 return -ENOMEM;
 867
 868         /* get number of valid DAI paths and their widgets */
 869         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
 870
 871         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
 872                         stream ? "capture" : "playback");
 873
 874         *list_ = list;
 875         return paths;
 876 }
 877
 878 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 879 {
 880         kfree(*list);
 881 }
 882
 883 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
 884         struct snd_soc_dapm_widget_list **list_)
 885 {
 886         struct snd_soc_dpcm *dpcm;
 887         struct snd_soc_dapm_widget_list *list = *list_;
 888         struct snd_soc_dapm_widget *widget;
 889         int prune = 0;
 890
 891         /* Destroy any old FE <--> BE connections */
 892         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 893
 894                 /* is there a valid CPU DAI widget for this BE */
 895                 widget = rtd_get_cpu_widget(dpcm->be, stream);
 896
 897                 /* prune the BE if it's no longer in our active list */
 898                 if (widget && widget_in_list(list, widget))
 899                         continue;
 900
 901                 /* is there a valid CODEC DAI widget for this BE */
 902                 widget = rtd_get_codec_widget(dpcm->be, stream);
 903
 904                 /* prune the BE if it's no longer in our active list */
 905                 if (widget && widget_in_list(list, widget))
 906                         continue;
 907
 908                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
 909                         stream ? "capture" : "playback",
 910                         dpcm->be->dai_link->name, fe->dai_link->name);
 911                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 912                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 913                 prune++;
 914         }
 915
 916         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
 917         return prune;
 918 }
 919
 920 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
 921         struct snd_soc_dapm_widget_list **list_)
 922 {
 923         struct snd_soc_card *card = fe->card;
 924         struct snd_soc_dapm_widget_list *list = *list_;
 925         struct snd_soc_pcm_runtime *be;
 926         int i, new = 0, err;
 927
 928         /* Create any new FE <--> BE connections */
 929         for (i = 0; i < list->num_widgets; i++) {
 930
 931                 switch (list->widgets[i]->id) {
 932                 case snd_soc_dapm_dai_in:
 933                 case snd_soc_dapm_dai_out:
 934                         break;
 935                 default:
 936                         continue;
 937                 }
 938
 939                 /* is there a valid BE rtd for this widget */
 940                 be = dpcm_get_be(card, list->widgets[i], stream);
 941                 if (!be) {
 942                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
 943                                         list->widgets[i]->name);
 944                         continue;
 945                 }
 946
 947                 /* make sure BE is a real BE */
 948                 if (!be->dai_link->no_pcm)
 949                         continue;
 950
 951                 /* don't connect if FE is not running */
 952                 if (!fe->dpcm[stream].runtime)
 953                         continue;
 954
 955                 /* newly connected FE and BE */
 956                 err = dpcm_be_connect(fe, be, stream);
 957                 if (err < 0) {
 958                         dev_err(fe->dev, "ASoC: can't connect %s\n",
 959                                 list->widgets[i]->name);
 960                         break;
 961                 } else if (err == 0) /* already connected */
 962                         continue;
 963
 964                 /* new */
 965                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 966                 new++;
 967         }
 968
 969         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
 970         return new;
 971 }
 972
 973 /*
 974  * Find the corresponding BE DAIs that source or sink audio to this
 975  * FE substream.
 976  */
 977 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 978         int stream, struct snd_soc_dapm_widget_list **list, int new)
 979 {
 980         if (new)
 981                 return dpcm_add_paths(fe, stream, list);
 982         else
 983                 return dpcm_prune_paths(fe, stream, list);
 984 }
 985
 986 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
 987 {
 988         struct snd_soc_dpcm *dpcm;
 989
 990         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
 991                 dpcm->be->dpcm[stream].runtime_update =
 992                                                 SND_SOC_DPCM_UPDATE_NO;
 993 }
 994
 995 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
 996         int stream)
 997 {
 998         struct snd_soc_dpcm *dpcm;
 999
1000         /* disable any enabled and non active backends */
1001         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1002
1003                 struct snd_soc_pcm_runtime *be = dpcm->be;
1004                 struct snd_pcm_substream *be_substream =
1005                         snd_soc_dpcm_get_substream(be, stream);
1006
1007                 if (be->dpcm[stream].users == 0)
1008                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1009                                 stream ? "capture" : "playback",
1010                                 be->dpcm[stream].state);
1011
1012                 if (--be->dpcm[stream].users != 0)
1013                         continue;
1014
1015                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1016                         continue;
1017
1018                 soc_pcm_close(be_substream);
1019                 be_substream->runtime = NULL;
1020                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1021         }
1022 }
1023
1024 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1025 {
1026         struct snd_soc_dpcm *dpcm;
1027         int err, count = 0;
1028
1029         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1030         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1031
1032                 struct snd_soc_pcm_runtime *be = dpcm->be;
1033                 struct snd_pcm_substream *be_substream =
1034                         snd_soc_dpcm_get_substream(be, stream);
1035
1036                 /* is this op for this BE ? */
1037                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1038                         continue;
1039
1040                 /* first time the dpcm is open ? */
1041                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1042                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1043                                 stream ? "capture" : "playback",
1044                                 be->dpcm[stream].state);
1045
1046                 if (be->dpcm[stream].users++ != 0)
1047                         continue;
1048
1049                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1050                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1051                         continue;
1052
1053                 dev_dbg(be->dev, "ASoC: open BE %s\n", be->dai_link->name);
1054
1055                 be_substream->runtime = be->dpcm[stream].runtime;
1056                 err = soc_pcm_open(be_substream);
1057                 if (err < 0) {
1058                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1059                         be->dpcm[stream].users--;
1060                         if (be->dpcm[stream].users < 0)
1061                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1062                                         stream ? "capture" : "playback",
1063                                         be->dpcm[stream].state);
1064
1065                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1066                         goto unwind;
1067                 }
1068
1069                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1070                 count++;
1071         }
1072
1073         return count;
1074
1075 unwind:
1076         /* disable any enabled and non active backends */
1077         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1078                 struct snd_soc_pcm_runtime *be = dpcm->be;
1079                 struct snd_pcm_substream *be_substream =
1080                         snd_soc_dpcm_get_substream(be, stream);
1081
1082                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1083                         continue;
1084
1085                 if (be->dpcm[stream].users == 0)
1086                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1087                                 stream ? "capture" : "playback",
1088                                 be->dpcm[stream].state);
1089
1090                 if (--be->dpcm[stream].users != 0)
1091                         continue;
1092
1093                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1094                         continue;
1095
1096                 soc_pcm_close(be_substream);
1097                 be_substream->runtime = NULL;
1098                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1099         }
1100
1101         return err;
1102 }
1103
1104 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1105 {
1106         struct snd_pcm_runtime *runtime = substream->runtime;
1107         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1108         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1109         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1110
1111         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1112                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1113                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1114                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1115                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1116                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1117                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1118         } else {
1119                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1120                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1121                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1122                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1123                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1124                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1125         }
1126 }
1127
1128 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1129 {
1130         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1131         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1132         int stream = fe_substream->stream, ret = 0;
1133
1134         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1135
1136         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1137         if (ret < 0) {
1138                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1139                 goto be_err;
1140         }
1141
1142         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1143
1144         /* start the DAI frontend */
1145         ret = soc_pcm_open(fe_substream);
1146         if (ret < 0) {
1147                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1148                 goto unwind;
1149         }
1150
1151         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1152
1153         dpcm_set_fe_runtime(fe_substream);
1154         snd_pcm_limit_hw_rates(runtime);
1155
1156         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1157         return 0;
1158
1159 unwind:
1160         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1161 be_err:
1162         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1163         return ret;
1164 }
1165
1166 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1167 {
1168         struct snd_soc_dpcm *dpcm;
1169
1170         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1171         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1172
1173                 struct snd_soc_pcm_runtime *be = dpcm->be;
1174                 struct snd_pcm_substream *be_substream =
1175                         snd_soc_dpcm_get_substream(be, stream);
1176
1177                 /* is this op for this BE ? */
1178                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1179                         continue;
1180
1181                 if (be->dpcm[stream].users == 0)
1182                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1183                                 stream ? "capture" : "playback",
1184                                 be->dpcm[stream].state);
1185
1186                 if (--be->dpcm[stream].users != 0)
1187                         continue;
1188
1189                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1190                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1191                         continue;
1192
1193                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1194                         dpcm->fe->dai_link->name);
1195
1196                 soc_pcm_close(be_substream);
1197                 be_substream->runtime = NULL;
1198
1199                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1200         }
1201         return 0;
1202 }
1203
1204 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1205 {
1206         struct snd_soc_pcm_runtime *fe = substream->private_data;
1207         int stream = substream->stream;
1208
1209         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1210
1211         /* shutdown the BEs */
1212         dpcm_be_dai_shutdown(fe, substream->stream);
1213
1214         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1215
1216         /* now shutdown the frontend */
1217         soc_pcm_close(substream);
1218
1219         /* run the stream event for each BE */
1220         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1221
1222         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1223         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1224         return 0;
1225 }
1226
1227 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1228 {
1229         struct snd_soc_dpcm *dpcm;
1230
1231         /* only hw_params backends that are either sinks or sources
1232          * to this frontend DAI */
1233         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1234
1235                 struct snd_soc_pcm_runtime *be = dpcm->be;
1236                 struct snd_pcm_substream *be_substream =
1237                         snd_soc_dpcm_get_substream(be, stream);
1238
1239                 /* is this op for this BE ? */
1240                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1241                         continue;
1242
1243                 /* only free hw when no longer used - check all FEs */
1244                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1245                                 continue;
1246
1247                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1248                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1249                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1250                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1251                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1252                         continue;
1253
1254                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1255                         dpcm->fe->dai_link->name);
1256
1257                 soc_pcm_hw_free(be_substream);
1258
1259                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1260         }
1261
1262         return 0;
1263 }
1264
1265 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1266 {
1267         struct snd_soc_pcm_runtime *fe = substream->private_data;
1268         int err, stream = substream->stream;
1269
1270         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1271         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1272
1273         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1274
1275         /* call hw_free on the frontend */
1276         err = soc_pcm_hw_free(substream);
1277         if (err < 0)
1278                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1279                         fe->dai_link->name);
1280
1281         /* only hw_params backends that are either sinks or sources
1282          * to this frontend DAI */
1283         err = dpcm_be_dai_hw_free(fe, stream);
1284
1285         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1286         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1287
1288         mutex_unlock(&fe->card->mutex);
1289         return 0;
1290 }
1291
1292 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1293 {
1294         struct snd_soc_dpcm *dpcm;
1295         int ret;
1296
1297         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1298
1299                 struct snd_soc_pcm_runtime *be = dpcm->be;
1300                 struct snd_pcm_substream *be_substream =
1301                         snd_soc_dpcm_get_substream(be, stream);
1302
1303                 /* is this op for this BE ? */
1304                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1305                         continue;
1306
1307                 /* only allow hw_params() if no connected FEs are running */
1308                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1309                         continue;
1310
1311                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1312                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1313                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1314                         continue;
1315
1316                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1317                         dpcm->fe->dai_link->name);
1318
1319                 /* copy params for each dpcm */
1320                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1321                                 sizeof(struct snd_pcm_hw_params));
1322
1323                 /* perform any hw_params fixups */
1324                 if (be->dai_link->be_hw_params_fixup) {
1325                         ret = be->dai_link->be_hw_params_fixup(be,
1326                                         &dpcm->hw_params);
1327                         if (ret < 0) {
1328                                 dev_err(be->dev,
1329                                         "ASoC: hw_params BE fixup failed %d\n",
1330                                         ret);
1331                                 goto unwind;
1332                         }
1333                 }
1334
1335                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1336                 if (ret < 0) {
1337                         dev_err(dpcm->be->dev,
1338                                 "ASoC: hw_params BE failed %d\n", ret);
1339                         goto unwind;
1340                 }
1341
1342                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1343         }
1344         return 0;
1345
1346 unwind:
1347         /* disable any enabled and non active backends */
1348         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1349                 struct snd_soc_pcm_runtime *be = dpcm->be;
1350                 struct snd_pcm_substream *be_substream =
1351                         snd_soc_dpcm_get_substream(be, stream);
1352
1353                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1354                         continue;
1355
1356                 /* only allow hw_free() if no connected FEs are running */
1357                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1358                         continue;
1359
1360                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1361                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1362                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1363                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1364                         continue;
1365
1366                 soc_pcm_hw_free(be_substream);
1367         }
1368
1369         return ret;
1370 }
1371
1372 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1373                                  struct snd_pcm_hw_params *params)
1374 {
1375         struct snd_soc_pcm_runtime *fe = substream->private_data;
1376         int ret, stream = substream->stream;
1377
1378         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1379         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1380
1381         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1382                         sizeof(struct snd_pcm_hw_params));
1383         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1384         if (ret < 0) {
1385                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1386                 goto out;
1387         }
1388
1389         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1390                         fe->dai_link->name, params_rate(params),
1391                         params_channels(params), params_format(params));
1392
1393         /* call hw_params on the frontend */
1394         ret = soc_pcm_hw_params(substream, params);
1395         if (ret < 0) {
1396                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1397                 dpcm_be_dai_hw_free(fe, stream);
1398          } else
1399                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1400
1401 out:
1402         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1403         mutex_unlock(&fe->card->mutex);
1404         return ret;
1405 }
1406
1407 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1408                 struct snd_pcm_substream *substream, int cmd)
1409 {
1410         int ret;
1411
1412         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1413                         dpcm->fe->dai_link->name, cmd);
1414
1415         ret = soc_pcm_trigger(substream, cmd);
1416         if (ret < 0)
1417                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1418
1419         return ret;
1420 }
1421
1422 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1423                                int cmd)
1424 {
1425         struct snd_soc_dpcm *dpcm;
1426         int ret = 0;
1427
1428         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1429
1430                 struct snd_soc_pcm_runtime *be = dpcm->be;
1431                 struct snd_pcm_substream *be_substream =
1432                         snd_soc_dpcm_get_substream(be, stream);
1433
1434                 /* is this op for this BE ? */
1435                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1436                         continue;
1437
1438                 switch (cmd) {
1439                 case SNDRV_PCM_TRIGGER_START:
1440                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1441                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1442                                 continue;
1443
1444                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1445                         if (ret)
1446                                 return ret;
1447
1448                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1449                         break;
1450                 case SNDRV_PCM_TRIGGER_RESUME:
1451                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1452                                 continue;
1453
1454                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1455                         if (ret)
1456                                 return ret;
1457
1458                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1459                         break;
1460                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1461                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1462                                 continue;
1463
1464                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1465                         if (ret)
1466                                 return ret;
1467
1468                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1469                         break;
1470                 case SNDRV_PCM_TRIGGER_STOP:
1471                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1472                                 continue;
1473
1474                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1475                                 continue;
1476
1477                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1478                         if (ret)
1479                                 return ret;
1480
1481                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1482                         break;
1483                 case SNDRV_PCM_TRIGGER_SUSPEND:
1484                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1485                                 continue;
1486
1487                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1488                                 continue;
1489
1490                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1491                         if (ret)
1492                                 return ret;
1493
1494                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1495                         break;
1496                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1497                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1498                                 continue;
1499
1500                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1501                                 continue;
1502
1503                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1504                         if (ret)
1505                                 return ret;
1506
1507                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1508                         break;
1509                 }
1510         }
1511
1512         return ret;
1513 }
1514 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1515
1516 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1517 {
1518         struct snd_soc_pcm_runtime *fe = substream->private_data;
1519         int stream = substream->stream, ret;
1520         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1521
1522         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1523
1524         switch (trigger) {
1525         case SND_SOC_DPCM_TRIGGER_PRE:
1526                 /* call trigger on the frontend before the backend. */
1527
1528                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1529                                 fe->dai_link->name, cmd);
1530
1531                 ret = soc_pcm_trigger(substream, cmd);
1532                 if (ret < 0) {
1533                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1534                         goto out;
1535                 }
1536
1537                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1538                 break;
1539         case SND_SOC_DPCM_TRIGGER_POST:
1540                 /* call trigger on the frontend after the backend. */
1541
1542                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1543                 if (ret < 0) {
1544                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1545                         goto out;
1546                 }
1547
1548                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1549                                 fe->dai_link->name, cmd);
1550
1551                 ret = soc_pcm_trigger(substream, cmd);
1552                 break;
1553         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1554                 /* bespoke trigger() - handles both FE and BEs */
1555
1556                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1557                                 fe->dai_link->name, cmd);
1558
1559                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1560                 if (ret < 0) {
1561                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1562                         goto out;
1563                 }
1564                 break;
1565         default:
1566                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1567                                 fe->dai_link->name);
1568                 ret = -EINVAL;
1569                 goto out;
1570         }
1571
1572         switch (cmd) {
1573         case SNDRV_PCM_TRIGGER_START:
1574         case SNDRV_PCM_TRIGGER_RESUME:
1575         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1576                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1577                 break;
1578         case SNDRV_PCM_TRIGGER_STOP:
1579         case SNDRV_PCM_TRIGGER_SUSPEND:
1580         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1581                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1582                 break;
1583         }
1584
1585 out:
1586         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1587         return ret;
1588 }
1589
1590 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1591 {
1592         struct snd_soc_dpcm *dpcm;
1593         int ret = 0;
1594
1595         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1596
1597                 struct snd_soc_pcm_runtime *be = dpcm->be;
1598                 struct snd_pcm_substream *be_substream =
1599                         snd_soc_dpcm_get_substream(be, stream);
1600
1601                 /* is this op for this BE ? */
1602                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1603                         continue;
1604
1605                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1606                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1607                         continue;
1608
1609                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
1610                         dpcm->fe->dai_link->name);
1611
1612                 ret = soc_pcm_prepare(be_substream);
1613                 if (ret < 0) {
1614                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
1615                                 ret);
1616                         break;
1617                 }
1618
1619                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1620         }
1621         return ret;
1622 }
1623
1624 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1625 {
1626         struct snd_soc_pcm_runtime *fe = substream->private_data;
1627         int stream = substream->stream, ret = 0;
1628
1629         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1630
1631         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
1632
1633         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1634
1635         /* there is no point preparing this FE if there are no BEs */
1636         if (list_empty(&fe->dpcm[stream].be_clients)) {
1637                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
1638                                 fe->dai_link->name);
1639                 ret = -EINVAL;
1640                 goto out;
1641         }
1642
1643         ret = dpcm_be_dai_prepare(fe, substream->stream);
1644         if (ret < 0)
1645                 goto out;
1646
1647         /* call prepare on the frontend */
1648         ret = soc_pcm_prepare(substream);
1649         if (ret < 0) {
1650                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
1651                         fe->dai_link->name);
1652                 goto out;
1653         }
1654
1655         /* run the stream event for each BE */
1656         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1657         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1658
1659 out:
1660         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1661         mutex_unlock(&fe->card->mutex);
1662
1663         return ret;
1664 }
1665
1666 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1667                      unsigned int cmd, void *arg)
1668 {
1669         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1670         struct snd_soc_platform *platform = rtd->platform;
1671
1672         if (platform->driver->ops->ioctl)
1673                 return platform->driver->ops->ioctl(substream, cmd, arg);
1674         return snd_pcm_lib_ioctl(substream, cmd, arg);
1675 }
1676
1677 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1678 {
1679         struct snd_pcm_substream *substream =
1680                 snd_soc_dpcm_get_substream(fe, stream);
1681         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1682         int err;
1683
1684         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
1685                         stream ? "capture" : "playback", fe->dai_link->name);
1686
1687         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1688                 /* call bespoke trigger - FE takes care of all BE triggers */
1689                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
1690                                 fe->dai_link->name);
1691
1692                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1693                 if (err < 0)
1694                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1695         } else {
1696                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
1697                         fe->dai_link->name);
1698
1699                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1700                 if (err < 0)
1701                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1702         }
1703
1704         err = dpcm_be_dai_hw_free(fe, stream);
1705         if (err < 0)
1706                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
1707
1708         err = dpcm_be_dai_shutdown(fe, stream);
1709         if (err < 0)
1710                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
1711
1712         /* run the stream event for each BE */
1713         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1714
1715         return 0;
1716 }
1717
1718 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1719 {
1720         struct snd_pcm_substream *substream =
1721                 snd_soc_dpcm_get_substream(fe, stream);
1722         struct snd_soc_dpcm *dpcm;
1723         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1724         int ret;
1725
1726         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
1727                         stream ? "capture" : "playback", fe->dai_link->name);
1728
1729         /* Only start the BE if the FE is ready */
1730         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1731                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1732                 return -EINVAL;
1733
1734         /* startup must always be called for new BEs */
1735         ret = dpcm_be_dai_startup(fe, stream);
1736         if (ret < 0)
1737                 goto disconnect;
1738
1739         /* keep going if FE state is > open */
1740         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1741                 return 0;
1742
1743         ret = dpcm_be_dai_hw_params(fe, stream);
1744         if (ret < 0)
1745                 goto close;
1746
1747         /* keep going if FE state is > hw_params */
1748         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1749                 return 0;
1750
1751
1752         ret = dpcm_be_dai_prepare(fe, stream);
1753         if (ret < 0)
1754                 goto hw_free;
1755
1756         /* run the stream event for each BE */
1757         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1758
1759         /* keep going if FE state is > prepare */
1760         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1761                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1762                 return 0;
1763
1764         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1765                 /* call trigger on the frontend - FE takes care of all BE triggers */
1766                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
1767                                 fe->dai_link->name);
1768
1769                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1770                 if (ret < 0) {
1771                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
1772                         goto hw_free;
1773                 }
1774         } else {
1775                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
1776                         fe->dai_link->name);
1777
1778                 ret = dpcm_be_dai_trigger(fe, stream,
1779                                         SNDRV_PCM_TRIGGER_START);
1780                 if (ret < 0) {
1781                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1782                         goto hw_free;
1783                 }
1784         }
1785
1786         return 0;
1787
1788 hw_free:
1789         dpcm_be_dai_hw_free(fe, stream);
1790 close:
1791         dpcm_be_dai_shutdown(fe, stream);
1792 disconnect:
1793         /* disconnect any non started BEs */
1794         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1795                 struct snd_soc_pcm_runtime *be = dpcm->be;
1796                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1797                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1798         }
1799
1800         return ret;
1801 }
1802
1803 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1804 {
1805         int ret;
1806
1807         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1808         ret = dpcm_run_update_startup(fe, stream);
1809         if (ret < 0)
1810                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
1811         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1812
1813         return ret;
1814 }
1815
1816 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1817 {
1818         int ret;
1819
1820         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1821         ret = dpcm_run_update_shutdown(fe, stream);
1822         if (ret < 0)
1823                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
1824         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1825
1826         return ret;
1827 }
1828
1829 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1830  * any DAI links.
1831  */
1832 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
1833 {
1834         struct snd_soc_card *card;
1835         int i, old, new, paths;
1836
1837         if (widget->codec)
1838                 card = widget->codec->card;
1839         else if (widget->platform)
1840                 card = widget->platform->card;
1841         else
1842                 return -EINVAL;
1843
1844         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1845         for (i = 0; i < card->num_rtd; i++) {
1846                 struct snd_soc_dapm_widget_list *list;
1847                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1848
1849                 /* make sure link is FE */
1850                 if (!fe->dai_link->dynamic)
1851                         continue;
1852
1853                 /* only check active links */
1854                 if (!fe->cpu_dai->active)
1855                         continue;
1856
1857                 /* DAPM sync will call this to update DSP paths */
1858                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
1859                         fe->dai_link->name);
1860
1861                 /* skip if FE doesn't have playback capability */
1862                 if (!fe->cpu_dai->driver->playback.channels_min)
1863                         goto capture;
1864
1865                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1866                 if (paths < 0) {
1867                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1868                                         fe->dai_link->name,  "playback");
1869                         mutex_unlock(&card->mutex);
1870                         return paths;
1871                 }
1872
1873                 /* update any new playback paths */
1874                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1875                 if (new) {
1876                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1877                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1878                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1879                 }
1880
1881                 /* update any old playback paths */
1882                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1883                 if (old) {
1884                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1885                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1886                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1887                 }
1888
1889                 dpcm_path_put(&list);
1890 capture:
1891                 /* skip if FE doesn't have capture capability */
1892                 if (!fe->cpu_dai->driver->capture.channels_min)
1893                         continue;
1894
1895                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1896                 if (paths < 0) {
1897                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1898                                         fe->dai_link->name,  "capture");
1899                         mutex_unlock(&card->mutex);
1900                         return paths;
1901                 }
1902
1903                 /* update any new capture paths */
1904                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1905                 if (new) {
1906                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1907                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1908                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1909                 }
1910
1911                 /* update any old capture paths */
1912                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1913                 if (old) {
1914                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1915                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1916                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1917                 }
1918
1919                 dpcm_path_put(&list);
1920         }
1921
1922         mutex_unlock(&card->mutex);
1923         return 0;
1924 }
1925 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1926 {
1927         struct snd_soc_dpcm *dpcm;
1928         struct list_head *clients =
1929                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1930
1931         list_for_each_entry(dpcm, clients, list_be) {
1932
1933                 struct snd_soc_pcm_runtime *be = dpcm->be;
1934                 struct snd_soc_dai *dai = be->codec_dai;
1935                 struct snd_soc_dai_driver *drv = dai->driver;
1936
1937                 if (be->dai_link->ignore_suspend)
1938                         continue;
1939
1940                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
1941
1942                 if (drv->ops->digital_mute && dai->playback_active)
1943                                 drv->ops->digital_mute(dai, mute);
1944         }
1945
1946         return 0;
1947 }
1948
1949 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1950 {
1951         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1952         struct snd_soc_dpcm *dpcm;
1953         struct snd_soc_dapm_widget_list *list;
1954         int ret;
1955         int stream = fe_substream->stream;
1956
1957         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1958         fe->dpcm[stream].runtime = fe_substream->runtime;
1959
1960         if (dpcm_path_get(fe, stream, &list) <= 0) {
1961                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
1962                         fe->dai_link->name, stream ? "capture" : "playback");
1963         }
1964
1965         /* calculate valid and active FE <-> BE dpcms */
1966         dpcm_process_paths(fe, stream, &list, 1);
1967
1968         ret = dpcm_fe_dai_startup(fe_substream);
1969         if (ret < 0) {
1970                 /* clean up all links */
1971                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1972                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1973
1974                 dpcm_be_disconnect(fe, stream);
1975                 fe->dpcm[stream].runtime = NULL;
1976         }
1977
1978         dpcm_clear_pending_state(fe, stream);
1979         dpcm_path_put(&list);
1980         mutex_unlock(&fe->card->mutex);
1981         return ret;
1982 }
1983
1984 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1985 {
1986         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1987         struct snd_soc_dpcm *dpcm;
1988         int stream = fe_substream->stream, ret;
1989
1990         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1991         ret = dpcm_fe_dai_shutdown(fe_substream);
1992
1993         /* mark FE's links ready to prune */
1994         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1995                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1996
1997         dpcm_be_disconnect(fe, stream);
1998
1999         fe->dpcm[stream].runtime = NULL;
2000         mutex_unlock(&fe->card->mutex);
2001         return ret;
2002 }
2003
2004 /* create a new pcm */
2005 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2006 {
2007         struct snd_soc_platform *platform = rtd->platform;
2008         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2009         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2010         struct snd_pcm *pcm;
2011         char new_name[64];
2012         int ret = 0, playback = 0, capture = 0;
2013
2014         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2015                 if (cpu_dai->driver->playback.channels_min)
2016                         playback = 1;
2017                 if (cpu_dai->driver->capture.channels_min)
2018                         capture = 1;
2019         } else {
2020                 if (codec_dai->driver->playback.channels_min &&
2021                     cpu_dai->driver->playback.channels_min)
2022                         playback = 1;
2023                 if (codec_dai->driver->capture.channels_min &&
2024                     cpu_dai->driver->capture.channels_min)
2025                         capture = 1;
2026         }
2027
2028         /* create the PCM */
2029         if (rtd->dai_link->no_pcm) {
2030                 snprintf(new_name, sizeof(new_name), "(%s)",
2031                         rtd->dai_link->stream_name);
2032
2033                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2034                                 playback, capture, &pcm);
2035         } else {
2036                 if (rtd->dai_link->dynamic)
2037                         snprintf(new_name, sizeof(new_name), "%s (*)",
2038                                 rtd->dai_link->stream_name);
2039                 else
2040                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2041                                 rtd->dai_link->stream_name, codec_dai->name, num);
2042
2043                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2044                         capture, &pcm);
2045         }
2046         if (ret < 0) {
2047                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2048                         rtd->dai_link->name);
2049                 return ret;
2050         }
2051         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2052
2053         /* DAPM dai link stream work */
2054         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2055
2056         rtd->pcm = pcm;
2057         pcm->private_data = rtd;
2058
2059         if (rtd->dai_link->no_pcm) {
2060                 if (playback)
2061                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2062                 if (capture)
2063                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2064                 goto out;
2065         }
2066
2067         /* ASoC PCM operations */
2068         if (rtd->dai_link->dynamic) {
2069                 rtd->ops.open           = dpcm_fe_dai_open;
2070                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2071                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2072                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2073                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2074                 rtd->ops.close          = dpcm_fe_dai_close;
2075                 rtd->ops.pointer        = soc_pcm_pointer;
2076                 rtd->ops.ioctl          = soc_pcm_ioctl;
2077         } else {
2078                 rtd->ops.open           = soc_pcm_open;
2079                 rtd->ops.hw_params      = soc_pcm_hw_params;
2080                 rtd->ops.prepare        = soc_pcm_prepare;
2081                 rtd->ops.trigger        = soc_pcm_trigger;
2082                 rtd->ops.hw_free        = soc_pcm_hw_free;
2083                 rtd->ops.close          = soc_pcm_close;
2084                 rtd->ops.pointer        = soc_pcm_pointer;
2085                 rtd->ops.ioctl          = soc_pcm_ioctl;
2086         }
2087
2088         if (platform->driver->ops) {
2089                 rtd->ops.ack            = platform->driver->ops->ack;
2090                 rtd->ops.copy           = platform->driver->ops->copy;
2091                 rtd->ops.silence        = platform->driver->ops->silence;
2092                 rtd->ops.page           = platform->driver->ops->page;
2093                 rtd->ops.mmap           = platform->driver->ops->mmap;
2094         }
2095
2096         if (playback)
2097                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2098
2099         if (capture)
2100                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2101
2102         if (platform->driver->pcm_new) {
2103                 ret = platform->driver->pcm_new(rtd);
2104                 if (ret < 0) {
2105                         dev_err(platform->dev,
2106                                 "ASoC: pcm constructor failed: %d\n",
2107                                 ret);
2108                         return ret;
2109                 }
2110         }
2111
2112         pcm->private_free = platform->driver->pcm_free;
2113 out:
2114         dev_info(rtd->card->dev, " %s <-> %s mapping ok\n", codec_dai->name,
2115                 cpu_dai->name);
2116         return ret;
2117 }
2118
2119 /* is the current PCM operation for this FE ? */
2120 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2121 {
2122         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2123                 return 1;
2124         return 0;
2125 }
2126 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2127
2128 /* is the current PCM operation for this BE ? */
2129 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2130                 struct snd_soc_pcm_runtime *be, int stream)
2131 {
2132         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2133            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2134                   be->dpcm[stream].runtime_update))
2135                 return 1;
2136         return 0;
2137 }
2138 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2139
2140 /* get the substream for this BE */
2141 struct snd_pcm_substream *
2142         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2143 {
2144         return be->pcm->streams[stream].substream;
2145 }
2146 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2147
2148 /* get the BE runtime state */
2149 enum snd_soc_dpcm_state
2150         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2151 {
2152         return be->dpcm[stream].state;
2153 }
2154 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2155
2156 /* set the BE runtime state */
2157 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2158                 int stream, enum snd_soc_dpcm_state state)
2159 {
2160         be->dpcm[stream].state = state;
2161 }
2162 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2163
2164 /*
2165  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2166  * are not running, paused or suspended for the specified stream direction.
2167  */
2168 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2169                 struct snd_soc_pcm_runtime *be, int stream)
2170 {
2171         struct snd_soc_dpcm *dpcm;
2172         int state;
2173
2174         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2175
2176                 if (dpcm->fe == fe)
2177                         continue;
2178
2179                 state = dpcm->fe->dpcm[stream].state;
2180                 if (state == SND_SOC_DPCM_STATE_START ||
2181                         state == SND_SOC_DPCM_STATE_PAUSED ||
2182                         state == SND_SOC_DPCM_STATE_SUSPEND)
2183                         return 0;
2184         }
2185
2186         /* it's safe to free/stop this BE DAI */
2187         return 1;
2188 }
2189 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2190
2191 /*
2192  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2193  * running, paused or suspended for the specified stream direction.
2194  */
2195 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2196                 struct snd_soc_pcm_runtime *be, int stream)
2197 {
2198         struct snd_soc_dpcm *dpcm;
2199         int state;
2200
2201         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2202
2203                 if (dpcm->fe == fe)
2204                         continue;
2205
2206                 state = dpcm->fe->dpcm[stream].state;
2207                 if (state == SND_SOC_DPCM_STATE_START ||
2208                         state == SND_SOC_DPCM_STATE_PAUSED ||
2209                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2210                         state == SND_SOC_DPCM_STATE_PREPARE)
2211                         return 0;
2212         }
2213
2214         /* it's safe to change hw_params */
2215         return 1;
2216 }
2217 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2218
2219 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2220                 int cmd, struct snd_soc_platform *platform)
2221 {
2222         if (platform->driver->ops->trigger)
2223                 return platform->driver->ops->trigger(substream, cmd);
2224         return 0;
2225 }
2226 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2227
2228 #ifdef CONFIG_DEBUG_FS
2229 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2230 {
2231         switch (state) {
2232         case SND_SOC_DPCM_STATE_NEW:
2233                 return "new";
2234         case SND_SOC_DPCM_STATE_OPEN:
2235                 return "open";
2236         case SND_SOC_DPCM_STATE_HW_PARAMS:
2237                 return "hw_params";
2238         case SND_SOC_DPCM_STATE_PREPARE:
2239                 return "prepare";
2240         case SND_SOC_DPCM_STATE_START:
2241                 return "start";
2242         case SND_SOC_DPCM_STATE_STOP:
2243                 return "stop";
2244         case SND_SOC_DPCM_STATE_SUSPEND:
2245                 return "suspend";
2246         case SND_SOC_DPCM_STATE_PAUSED:
2247                 return "paused";
2248         case SND_SOC_DPCM_STATE_HW_FREE:
2249                 return "hw_free";
2250         case SND_SOC_DPCM_STATE_CLOSE:
2251                 return "close";
2252         }
2253
2254         return "unknown";
2255 }
2256
2257 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2258                                 int stream, char *buf, size_t size)
2259 {
2260         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2261         struct snd_soc_dpcm *dpcm;
2262         ssize_t offset = 0;
2263
2264         /* FE state */
2265         offset += snprintf(buf + offset, size - offset,
2266                         "[%s - %s]\n", fe->dai_link->name,
2267                         stream ? "Capture" : "Playback");
2268
2269         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2270                         dpcm_state_string(fe->dpcm[stream].state));
2271
2272         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2273             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2274                 offset += snprintf(buf + offset, size - offset,
2275                                 "Hardware Params: "
2276                                 "Format = %s, Channels = %d, Rate = %d\n",
2277                                 snd_pcm_format_name(params_format(params)),
2278                                 params_channels(params),
2279                                 params_rate(params));
2280
2281         /* BEs state */
2282         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2283
2284         if (list_empty(&fe->dpcm[stream].be_clients)) {
2285                 offset += snprintf(buf + offset, size - offset,
2286                                 " No active DSP links\n");
2287                 goto out;
2288         }
2289
2290         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2291                 struct snd_soc_pcm_runtime *be = dpcm->be;
2292                 params = &dpcm->hw_params;
2293
2294                 offset += snprintf(buf + offset, size - offset,
2295                                 "- %s\n", be->dai_link->name);
2296
2297                 offset += snprintf(buf + offset, size - offset,
2298                                 "   State: %s\n",
2299                                 dpcm_state_string(be->dpcm[stream].state));
2300
2301                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2302                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2303                         offset += snprintf(buf + offset, size - offset,
2304                                 "   Hardware Params: "
2305                                 "Format = %s, Channels = %d, Rate = %d\n",
2306                                 snd_pcm_format_name(params_format(params)),
2307                                 params_channels(params),
2308                                 params_rate(params));
2309         }
2310
2311 out:
2312         return offset;
2313 }
2314
2315 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2316                                 size_t count, loff_t *ppos)
2317 {
2318         struct snd_soc_pcm_runtime *fe = file->private_data;
2319         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2320         char *buf;
2321
2322         buf = kmalloc(out_count, GFP_KERNEL);
2323         if (!buf)
2324                 return -ENOMEM;
2325
2326         if (fe->cpu_dai->driver->playback.channels_min)
2327                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2328                                         buf + offset, out_count - offset);
2329
2330         if (fe->cpu_dai->driver->capture.channels_min)
2331                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2332                                         buf + offset, out_count - offset);
2333
2334         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2335
2336         kfree(buf);
2337         return ret;
2338 }
2339
2340 static const struct file_operations dpcm_state_fops = {
2341         .open = simple_open,
2342         .read = dpcm_state_read_file,
2343         .llseek = default_llseek,
2344 };
2345
2346 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2347 {
2348         if (!rtd->dai_link)
2349                 return 0;
2350
2351         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2352                         rtd->card->debugfs_card_root);
2353         if (!rtd->debugfs_dpcm_root) {
2354                 dev_dbg(rtd->dev,
2355                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2356                          rtd->dai_link->name);
2357                 return -EINVAL;
2358         }
2359
2360         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2361                                                 rtd->debugfs_dpcm_root,
2362                                                 rtd, &dpcm_state_fops);
2363
2364         return 0;
2365 }
2366 #endif