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                 if (list->widgets[i]->id != snd_soc_dapm_dai)
 932                         continue;
 933
 934                 /* is there a valid BE rtd for this widget */
 935                 be = dpcm_get_be(card, list->widgets[i], stream);
 936                 if (!be) {
 937                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
 938                                         list->widgets[i]->name);
 939                         continue;
 940                 }
 941
 942                 /* make sure BE is a real BE */
 943                 if (!be->dai_link->no_pcm)
 944                         continue;
 945
 946                 /* don't connect if FE is not running */
 947                 if (!fe->dpcm[stream].runtime)
 948                         continue;
 949
 950                 /* newly connected FE and BE */
 951                 err = dpcm_be_connect(fe, be, stream);
 952                 if (err < 0) {
 953                         dev_err(fe->dev, "ASoC: can't connect %s\n",
 954                                 list->widgets[i]->name);
 955                         break;
 956                 } else if (err == 0) /* already connected */
 957                         continue;
 958
 959                 /* new */
 960                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 961                 new++;
 962         }
 963
 964         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
 965         return new;
 966 }
 967
 968 /*
 969  * Find the corresponding BE DAIs that source or sink audio to this
 970  * FE substream.
 971  */
 972 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 973         int stream, struct snd_soc_dapm_widget_list **list, int new)
 974 {
 975         if (new)
 976                 return dpcm_add_paths(fe, stream, list);
 977         else
 978                 return dpcm_prune_paths(fe, stream, list);
 979 }
 980
 981 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
 982 {
 983         struct snd_soc_dpcm *dpcm;
 984
 985         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
 986                 dpcm->be->dpcm[stream].runtime_update =
 987                                                 SND_SOC_DPCM_UPDATE_NO;
 988 }
 989
 990 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
 991         int stream)
 992 {
 993         struct snd_soc_dpcm *dpcm;
 994
 995         /* disable any enabled and non active backends */
 996         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 997
 998                 struct snd_soc_pcm_runtime *be = dpcm->be;
 999                 struct snd_pcm_substream *be_substream =
1000                         snd_soc_dpcm_get_substream(be, stream);
1001
1002                 if (be->dpcm[stream].users == 0)
1003                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1004                                 stream ? "capture" : "playback",
1005                                 be->dpcm[stream].state);
1006
1007                 if (--be->dpcm[stream].users != 0)
1008                         continue;
1009
1010                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1011                         continue;
1012
1013                 soc_pcm_close(be_substream);
1014                 be_substream->runtime = NULL;
1015                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1016         }
1017 }
1018
1019 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1020 {
1021         struct snd_soc_dpcm *dpcm;
1022         int err, count = 0;
1023
1024         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1025         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1026
1027                 struct snd_soc_pcm_runtime *be = dpcm->be;
1028                 struct snd_pcm_substream *be_substream =
1029                         snd_soc_dpcm_get_substream(be, stream);
1030
1031                 /* is this op for this BE ? */
1032                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1033                         continue;
1034
1035                 /* first time the dpcm is open ? */
1036                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1037                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1038                                 stream ? "capture" : "playback",
1039                                 be->dpcm[stream].state);
1040
1041                 if (be->dpcm[stream].users++ != 0)
1042                         continue;
1043
1044                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1045                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1046                         continue;
1047
1048                 dev_dbg(be->dev, "ASoC: open BE %s\n", be->dai_link->name);
1049
1050                 be_substream->runtime = be->dpcm[stream].runtime;
1051                 err = soc_pcm_open(be_substream);
1052                 if (err < 0) {
1053                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1054                         be->dpcm[stream].users--;
1055                         if (be->dpcm[stream].users < 0)
1056                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1057                                         stream ? "capture" : "playback",
1058                                         be->dpcm[stream].state);
1059
1060                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1061                         goto unwind;
1062                 }
1063
1064                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1065                 count++;
1066         }
1067
1068         return count;
1069
1070 unwind:
1071         /* disable any enabled and non active backends */
1072         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1073                 struct snd_soc_pcm_runtime *be = dpcm->be;
1074                 struct snd_pcm_substream *be_substream =
1075                         snd_soc_dpcm_get_substream(be, stream);
1076
1077                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1078                         continue;
1079
1080                 if (be->dpcm[stream].users == 0)
1081                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1082                                 stream ? "capture" : "playback",
1083                                 be->dpcm[stream].state);
1084
1085                 if (--be->dpcm[stream].users != 0)
1086                         continue;
1087
1088                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1089                         continue;
1090
1091                 soc_pcm_close(be_substream);
1092                 be_substream->runtime = NULL;
1093                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1094         }
1095
1096         return err;
1097 }
1098
1099 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1100 {
1101         struct snd_pcm_runtime *runtime = substream->runtime;
1102         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1103         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1104         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1105
1106         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1107                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1108                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1109                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1110                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1111                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1112                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1113         } else {
1114                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1115                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1116                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1117                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1118                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1119                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1120         }
1121 }
1122
1123 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1124 {
1125         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1126         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1127         int stream = fe_substream->stream, ret = 0;
1128
1129         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1130
1131         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1132         if (ret < 0) {
1133                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1134                 goto be_err;
1135         }
1136
1137         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1138
1139         /* start the DAI frontend */
1140         ret = soc_pcm_open(fe_substream);
1141         if (ret < 0) {
1142                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1143                 goto unwind;
1144         }
1145
1146         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1147
1148         dpcm_set_fe_runtime(fe_substream);
1149         snd_pcm_limit_hw_rates(runtime);
1150
1151         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1152         return 0;
1153
1154 unwind:
1155         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1156 be_err:
1157         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1158         return ret;
1159 }
1160
1161 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1162 {
1163         struct snd_soc_dpcm *dpcm;
1164
1165         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1166         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1167
1168                 struct snd_soc_pcm_runtime *be = dpcm->be;
1169                 struct snd_pcm_substream *be_substream =
1170                         snd_soc_dpcm_get_substream(be, stream);
1171
1172                 /* is this op for this BE ? */
1173                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1174                         continue;
1175
1176                 if (be->dpcm[stream].users == 0)
1177                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1178                                 stream ? "capture" : "playback",
1179                                 be->dpcm[stream].state);
1180
1181                 if (--be->dpcm[stream].users != 0)
1182                         continue;
1183
1184                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1185                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1186                         continue;
1187
1188                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1189                         dpcm->fe->dai_link->name);
1190
1191                 soc_pcm_close(be_substream);
1192                 be_substream->runtime = NULL;
1193
1194                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1195         }
1196         return 0;
1197 }
1198
1199 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1200 {
1201         struct snd_soc_pcm_runtime *fe = substream->private_data;
1202         int stream = substream->stream;
1203
1204         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1205
1206         /* shutdown the BEs */
1207         dpcm_be_dai_shutdown(fe, substream->stream);
1208
1209         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1210
1211         /* now shutdown the frontend */
1212         soc_pcm_close(substream);
1213
1214         /* run the stream event for each BE */
1215         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1216
1217         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1218         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1219         return 0;
1220 }
1221
1222 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1223 {
1224         struct snd_soc_dpcm *dpcm;
1225
1226         /* only hw_params backends that are either sinks or sources
1227          * to this frontend DAI */
1228         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1229
1230                 struct snd_soc_pcm_runtime *be = dpcm->be;
1231                 struct snd_pcm_substream *be_substream =
1232                         snd_soc_dpcm_get_substream(be, stream);
1233
1234                 /* is this op for this BE ? */
1235                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1236                         continue;
1237
1238                 /* only free hw when no longer used - check all FEs */
1239                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1240                                 continue;
1241
1242                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1243                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1244                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1245                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1246                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1247                         continue;
1248
1249                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1250                         dpcm->fe->dai_link->name);
1251
1252                 soc_pcm_hw_free(be_substream);
1253
1254                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1255         }
1256
1257         return 0;
1258 }
1259
1260 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1261 {
1262         struct snd_soc_pcm_runtime *fe = substream->private_data;
1263         int err, stream = substream->stream;
1264
1265         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1266         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1267
1268         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1269
1270         /* call hw_free on the frontend */
1271         err = soc_pcm_hw_free(substream);
1272         if (err < 0)
1273                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1274                         fe->dai_link->name);
1275
1276         /* only hw_params backends that are either sinks or sources
1277          * to this frontend DAI */
1278         err = dpcm_be_dai_hw_free(fe, stream);
1279
1280         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1281         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1282
1283         mutex_unlock(&fe->card->mutex);
1284         return 0;
1285 }
1286
1287 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1288 {
1289         struct snd_soc_dpcm *dpcm;
1290         int ret;
1291
1292         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1293
1294                 struct snd_soc_pcm_runtime *be = dpcm->be;
1295                 struct snd_pcm_substream *be_substream =
1296                         snd_soc_dpcm_get_substream(be, stream);
1297
1298                 /* is this op for this BE ? */
1299                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1300                         continue;
1301
1302                 /* only allow hw_params() if no connected FEs are running */
1303                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1304                         continue;
1305
1306                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1307                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1308                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1309                         continue;
1310
1311                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1312                         dpcm->fe->dai_link->name);
1313
1314                 /* copy params for each dpcm */
1315                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1316                                 sizeof(struct snd_pcm_hw_params));
1317
1318                 /* perform any hw_params fixups */
1319                 if (be->dai_link->be_hw_params_fixup) {
1320                         ret = be->dai_link->be_hw_params_fixup(be,
1321                                         &dpcm->hw_params);
1322                         if (ret < 0) {
1323                                 dev_err(be->dev,
1324                                         "ASoC: hw_params BE fixup failed %d\n",
1325                                         ret);
1326                                 goto unwind;
1327                         }
1328                 }
1329
1330                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1331                 if (ret < 0) {
1332                         dev_err(dpcm->be->dev,
1333                                 "ASoC: hw_params BE failed %d\n", ret);
1334                         goto unwind;
1335                 }
1336
1337                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1338         }
1339         return 0;
1340
1341 unwind:
1342         /* disable any enabled and non active backends */
1343         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1344                 struct snd_soc_pcm_runtime *be = dpcm->be;
1345                 struct snd_pcm_substream *be_substream =
1346                         snd_soc_dpcm_get_substream(be, stream);
1347
1348                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1349                         continue;
1350
1351                 /* only allow hw_free() if no connected FEs are running */
1352                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1353                         continue;
1354
1355                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1356                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1357                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1358                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1359                         continue;
1360
1361                 soc_pcm_hw_free(be_substream);
1362         }
1363
1364         return ret;
1365 }
1366
1367 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1368                                  struct snd_pcm_hw_params *params)
1369 {
1370         struct snd_soc_pcm_runtime *fe = substream->private_data;
1371         int ret, stream = substream->stream;
1372
1373         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1374         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1375
1376         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1377                         sizeof(struct snd_pcm_hw_params));
1378         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1379         if (ret < 0) {
1380                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1381                 goto out;
1382         }
1383
1384         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1385                         fe->dai_link->name, params_rate(params),
1386                         params_channels(params), params_format(params));
1387
1388         /* call hw_params on the frontend */
1389         ret = soc_pcm_hw_params(substream, params);
1390         if (ret < 0) {
1391                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1392                 dpcm_be_dai_hw_free(fe, stream);
1393          } else
1394                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1395
1396 out:
1397         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1398         mutex_unlock(&fe->card->mutex);
1399         return ret;
1400 }
1401
1402 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1403                 struct snd_pcm_substream *substream, int cmd)
1404 {
1405         int ret;
1406
1407         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1408                         dpcm->fe->dai_link->name, cmd);
1409
1410         ret = soc_pcm_trigger(substream, cmd);
1411         if (ret < 0)
1412                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1413
1414         return ret;
1415 }
1416
1417 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1418                                int cmd)
1419 {
1420         struct snd_soc_dpcm *dpcm;
1421         int ret = 0;
1422
1423         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1424
1425                 struct snd_soc_pcm_runtime *be = dpcm->be;
1426                 struct snd_pcm_substream *be_substream =
1427                         snd_soc_dpcm_get_substream(be, stream);
1428
1429                 /* is this op for this BE ? */
1430                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1431                         continue;
1432
1433                 switch (cmd) {
1434                 case SNDRV_PCM_TRIGGER_START:
1435                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1436                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1437                                 continue;
1438
1439                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1440                         if (ret)
1441                                 return ret;
1442
1443                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1444                         break;
1445                 case SNDRV_PCM_TRIGGER_RESUME:
1446                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1447                                 continue;
1448
1449                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1450                         if (ret)
1451                                 return ret;
1452
1453                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1454                         break;
1455                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1456                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1457                                 continue;
1458
1459                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1460                         if (ret)
1461                                 return ret;
1462
1463                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1464                         break;
1465                 case SNDRV_PCM_TRIGGER_STOP:
1466                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1467                                 continue;
1468
1469                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1470                                 continue;
1471
1472                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1473                         if (ret)
1474                                 return ret;
1475
1476                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1477                         break;
1478                 case SNDRV_PCM_TRIGGER_SUSPEND:
1479                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1480                                 continue;
1481
1482                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1483                                 continue;
1484
1485                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1486                         if (ret)
1487                                 return ret;
1488
1489                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1490                         break;
1491                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1492                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1493                                 continue;
1494
1495                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1496                                 continue;
1497
1498                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1499                         if (ret)
1500                                 return ret;
1501
1502                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1503                         break;
1504                 }
1505         }
1506
1507         return ret;
1508 }
1509 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1510
1511 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1512 {
1513         struct snd_soc_pcm_runtime *fe = substream->private_data;
1514         int stream = substream->stream, ret;
1515         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1516
1517         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1518
1519         switch (trigger) {
1520         case SND_SOC_DPCM_TRIGGER_PRE:
1521                 /* call trigger on the frontend before the backend. */
1522
1523                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1524                                 fe->dai_link->name, cmd);
1525
1526                 ret = soc_pcm_trigger(substream, cmd);
1527                 if (ret < 0) {
1528                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1529                         goto out;
1530                 }
1531
1532                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1533                 break;
1534         case SND_SOC_DPCM_TRIGGER_POST:
1535                 /* call trigger on the frontend after the backend. */
1536
1537                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1538                 if (ret < 0) {
1539                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1540                         goto out;
1541                 }
1542
1543                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1544                                 fe->dai_link->name, cmd);
1545
1546                 ret = soc_pcm_trigger(substream, cmd);
1547                 break;
1548         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1549                 /* bespoke trigger() - handles both FE and BEs */
1550
1551                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1552                                 fe->dai_link->name, cmd);
1553
1554                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1555                 if (ret < 0) {
1556                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1557                         goto out;
1558                 }
1559                 break;
1560         default:
1561                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1562                                 fe->dai_link->name);
1563                 ret = -EINVAL;
1564                 goto out;
1565         }
1566
1567         switch (cmd) {
1568         case SNDRV_PCM_TRIGGER_START:
1569         case SNDRV_PCM_TRIGGER_RESUME:
1570         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1571                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1572                 break;
1573         case SNDRV_PCM_TRIGGER_STOP:
1574         case SNDRV_PCM_TRIGGER_SUSPEND:
1575         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1576                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1577                 break;
1578         }
1579
1580 out:
1581         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1582         return ret;
1583 }
1584
1585 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1586 {
1587         struct snd_soc_dpcm *dpcm;
1588         int ret = 0;
1589
1590         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1591
1592                 struct snd_soc_pcm_runtime *be = dpcm->be;
1593                 struct snd_pcm_substream *be_substream =
1594                         snd_soc_dpcm_get_substream(be, stream);
1595
1596                 /* is this op for this BE ? */
1597                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1598                         continue;
1599
1600                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1601                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1602                         continue;
1603
1604                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
1605                         dpcm->fe->dai_link->name);
1606
1607                 ret = soc_pcm_prepare(be_substream);
1608                 if (ret < 0) {
1609                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
1610                                 ret);
1611                         break;
1612                 }
1613
1614                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1615         }
1616         return ret;
1617 }
1618
1619 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1620 {
1621         struct snd_soc_pcm_runtime *fe = substream->private_data;
1622         int stream = substream->stream, ret = 0;
1623
1624         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1625
1626         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
1627
1628         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1629
1630         /* there is no point preparing this FE if there are no BEs */
1631         if (list_empty(&fe->dpcm[stream].be_clients)) {
1632                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
1633                                 fe->dai_link->name);
1634                 ret = -EINVAL;
1635                 goto out;
1636         }
1637
1638         ret = dpcm_be_dai_prepare(fe, substream->stream);
1639         if (ret < 0)
1640                 goto out;
1641
1642         /* call prepare on the frontend */
1643         ret = soc_pcm_prepare(substream);
1644         if (ret < 0) {
1645                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
1646                         fe->dai_link->name);
1647                 goto out;
1648         }
1649
1650         /* run the stream event for each BE */
1651         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1652         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1653
1654 out:
1655         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1656         mutex_unlock(&fe->card->mutex);
1657
1658         return ret;
1659 }
1660
1661 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1662                      unsigned int cmd, void *arg)
1663 {
1664         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1665         struct snd_soc_platform *platform = rtd->platform;
1666
1667         if (platform->driver->ops->ioctl)
1668                 return platform->driver->ops->ioctl(substream, cmd, arg);
1669         return snd_pcm_lib_ioctl(substream, cmd, arg);
1670 }
1671
1672 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1673 {
1674         struct snd_pcm_substream *substream =
1675                 snd_soc_dpcm_get_substream(fe, stream);
1676         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1677         int err;
1678
1679         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
1680                         stream ? "capture" : "playback", fe->dai_link->name);
1681
1682         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1683                 /* call bespoke trigger - FE takes care of all BE triggers */
1684                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
1685                                 fe->dai_link->name);
1686
1687                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1688                 if (err < 0)
1689                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1690         } else {
1691                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
1692                         fe->dai_link->name);
1693
1694                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1695                 if (err < 0)
1696                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1697         }
1698
1699         err = dpcm_be_dai_hw_free(fe, stream);
1700         if (err < 0)
1701                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
1702
1703         err = dpcm_be_dai_shutdown(fe, stream);
1704         if (err < 0)
1705                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
1706
1707         /* run the stream event for each BE */
1708         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1709
1710         return 0;
1711 }
1712
1713 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1714 {
1715         struct snd_pcm_substream *substream =
1716                 snd_soc_dpcm_get_substream(fe, stream);
1717         struct snd_soc_dpcm *dpcm;
1718         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1719         int ret;
1720
1721         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
1722                         stream ? "capture" : "playback", fe->dai_link->name);
1723
1724         /* Only start the BE if the FE is ready */
1725         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1726                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1727                 return -EINVAL;
1728
1729         /* startup must always be called for new BEs */
1730         ret = dpcm_be_dai_startup(fe, stream);
1731         if (ret < 0)
1732                 goto disconnect;
1733
1734         /* keep going if FE state is > open */
1735         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1736                 return 0;
1737
1738         ret = dpcm_be_dai_hw_params(fe, stream);
1739         if (ret < 0)
1740                 goto close;
1741
1742         /* keep going if FE state is > hw_params */
1743         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1744                 return 0;
1745
1746
1747         ret = dpcm_be_dai_prepare(fe, stream);
1748         if (ret < 0)
1749                 goto hw_free;
1750
1751         /* run the stream event for each BE */
1752         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1753
1754         /* keep going if FE state is > prepare */
1755         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1756                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1757                 return 0;
1758
1759         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1760                 /* call trigger on the frontend - FE takes care of all BE triggers */
1761                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
1762                                 fe->dai_link->name);
1763
1764                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1765                 if (ret < 0) {
1766                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
1767                         goto hw_free;
1768                 }
1769         } else {
1770                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
1771                         fe->dai_link->name);
1772
1773                 ret = dpcm_be_dai_trigger(fe, stream,
1774                                         SNDRV_PCM_TRIGGER_START);
1775                 if (ret < 0) {
1776                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1777                         goto hw_free;
1778                 }
1779         }
1780
1781         return 0;
1782
1783 hw_free:
1784         dpcm_be_dai_hw_free(fe, stream);
1785 close:
1786         dpcm_be_dai_shutdown(fe, stream);
1787 disconnect:
1788         /* disconnect any non started BEs */
1789         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1790                 struct snd_soc_pcm_runtime *be = dpcm->be;
1791                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1792                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1793         }
1794
1795         return ret;
1796 }
1797
1798 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1799 {
1800         int ret;
1801
1802         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1803         ret = dpcm_run_update_startup(fe, stream);
1804         if (ret < 0)
1805                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
1806         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1807
1808         return ret;
1809 }
1810
1811 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1812 {
1813         int ret;
1814
1815         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1816         ret = dpcm_run_update_shutdown(fe, stream);
1817         if (ret < 0)
1818                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
1819         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1820
1821         return ret;
1822 }
1823
1824 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1825  * any DAI links.
1826  */
1827 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
1828 {
1829         struct snd_soc_card *card;
1830         int i, old, new, paths;
1831
1832         if (widget->codec)
1833                 card = widget->codec->card;
1834         else if (widget->platform)
1835                 card = widget->platform->card;
1836         else
1837                 return -EINVAL;
1838
1839         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1840         for (i = 0; i < card->num_rtd; i++) {
1841                 struct snd_soc_dapm_widget_list *list;
1842                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1843
1844                 /* make sure link is FE */
1845                 if (!fe->dai_link->dynamic)
1846                         continue;
1847
1848                 /* only check active links */
1849                 if (!fe->cpu_dai->active)
1850                         continue;
1851
1852                 /* DAPM sync will call this to update DSP paths */
1853                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
1854                         fe->dai_link->name);
1855
1856                 /* skip if FE doesn't have playback capability */
1857                 if (!fe->cpu_dai->driver->playback.channels_min)
1858                         goto capture;
1859
1860                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1861                 if (paths < 0) {
1862                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1863                                         fe->dai_link->name,  "playback");
1864                         mutex_unlock(&card->mutex);
1865                         return paths;
1866                 }
1867
1868                 /* update any new playback paths */
1869                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1870                 if (new) {
1871                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1872                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1873                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1874                 }
1875
1876                 /* update any old playback paths */
1877                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1878                 if (old) {
1879                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1880                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1881                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1882                 }
1883
1884 capture:
1885                 /* skip if FE doesn't have capture capability */
1886                 if (!fe->cpu_dai->driver->capture.channels_min)
1887                         continue;
1888
1889                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1890                 if (paths < 0) {
1891                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1892                                         fe->dai_link->name,  "capture");
1893                         mutex_unlock(&card->mutex);
1894                         return paths;
1895                 }
1896
1897                 /* update any new capture paths */
1898                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1899                 if (new) {
1900                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1901                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1902                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1903                 }
1904
1905                 /* update any old capture paths */
1906                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1907                 if (old) {
1908                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1909                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1910                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1911                 }
1912
1913                 dpcm_path_put(&list);
1914         }
1915
1916         mutex_unlock(&card->mutex);
1917         return 0;
1918 }
1919 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1920 {
1921         struct snd_soc_dpcm *dpcm;
1922         struct list_head *clients =
1923                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1924
1925         list_for_each_entry(dpcm, clients, list_be) {
1926
1927                 struct snd_soc_pcm_runtime *be = dpcm->be;
1928                 struct snd_soc_dai *dai = be->codec_dai;
1929                 struct snd_soc_dai_driver *drv = dai->driver;
1930
1931                 if (be->dai_link->ignore_suspend)
1932                         continue;
1933
1934                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
1935
1936                 if (drv->ops->digital_mute && dai->playback_active)
1937                                 drv->ops->digital_mute(dai, mute);
1938         }
1939
1940         return 0;
1941 }
1942
1943 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1944 {
1945         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1946         struct snd_soc_dpcm *dpcm;
1947         struct snd_soc_dapm_widget_list *list;
1948         int ret;
1949         int stream = fe_substream->stream;
1950
1951         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1952         fe->dpcm[stream].runtime = fe_substream->runtime;
1953
1954         if (dpcm_path_get(fe, stream, &list) <= 0) {
1955                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
1956                         fe->dai_link->name, stream ? "capture" : "playback");
1957         }
1958
1959         /* calculate valid and active FE <-> BE dpcms */
1960         dpcm_process_paths(fe, stream, &list, 1);
1961
1962         ret = dpcm_fe_dai_startup(fe_substream);
1963         if (ret < 0) {
1964                 /* clean up all links */
1965                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1966                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1967
1968                 dpcm_be_disconnect(fe, stream);
1969                 fe->dpcm[stream].runtime = NULL;
1970         }
1971
1972         dpcm_clear_pending_state(fe, stream);
1973         dpcm_path_put(&list);
1974         mutex_unlock(&fe->card->mutex);
1975         return ret;
1976 }
1977
1978 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1979 {
1980         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1981         struct snd_soc_dpcm *dpcm;
1982         int stream = fe_substream->stream, ret;
1983
1984         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1985         ret = dpcm_fe_dai_shutdown(fe_substream);
1986
1987         /* mark FE's links ready to prune */
1988         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1989                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1990
1991         dpcm_be_disconnect(fe, stream);
1992
1993         fe->dpcm[stream].runtime = NULL;
1994         mutex_unlock(&fe->card->mutex);
1995         return ret;
1996 }
1997
1998 /* create a new pcm */
1999 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2000 {
2001         struct snd_soc_platform *platform = rtd->platform;
2002         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2003         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2004         struct snd_pcm *pcm;
2005         char new_name[64];
2006         int ret = 0, playback = 0, capture = 0;
2007
2008         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2009                 if (cpu_dai->driver->playback.channels_min)
2010                         playback = 1;
2011                 if (cpu_dai->driver->capture.channels_min)
2012                         capture = 1;
2013         } else {
2014                 if (codec_dai->driver->playback.channels_min &&
2015                     cpu_dai->driver->playback.channels_min)
2016                         playback = 1;
2017                 if (codec_dai->driver->capture.channels_min &&
2018                     cpu_dai->driver->capture.channels_min)
2019                         capture = 1;
2020         }
2021
2022         /* create the PCM */
2023         if (rtd->dai_link->no_pcm) {
2024                 snprintf(new_name, sizeof(new_name), "(%s)",
2025                         rtd->dai_link->stream_name);
2026
2027                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2028                                 playback, capture, &pcm);
2029         } else {
2030                 if (rtd->dai_link->dynamic)
2031                         snprintf(new_name, sizeof(new_name), "%s (*)",
2032                                 rtd->dai_link->stream_name);
2033                 else
2034                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2035                                 rtd->dai_link->stream_name, codec_dai->name, num);
2036
2037                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2038                         capture, &pcm);
2039         }
2040         if (ret < 0) {
2041                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2042                         rtd->dai_link->name);
2043                 return ret;
2044         }
2045         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2046
2047         /* DAPM dai link stream work */
2048         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2049
2050         rtd->pcm = pcm;
2051         pcm->private_data = rtd;
2052
2053         if (rtd->dai_link->no_pcm) {
2054                 if (playback)
2055                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2056                 if (capture)
2057                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2058                 goto out;
2059         }
2060
2061         /* ASoC PCM operations */
2062         if (rtd->dai_link->dynamic) {
2063                 rtd->ops.open           = dpcm_fe_dai_open;
2064                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2065                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2066                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2067                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2068                 rtd->ops.close          = dpcm_fe_dai_close;
2069                 rtd->ops.pointer        = soc_pcm_pointer;
2070                 rtd->ops.ioctl          = soc_pcm_ioctl;
2071         } else {
2072                 rtd->ops.open           = soc_pcm_open;
2073                 rtd->ops.hw_params      = soc_pcm_hw_params;
2074                 rtd->ops.prepare        = soc_pcm_prepare;
2075                 rtd->ops.trigger        = soc_pcm_trigger;
2076                 rtd->ops.hw_free        = soc_pcm_hw_free;
2077                 rtd->ops.close          = soc_pcm_close;
2078                 rtd->ops.pointer        = soc_pcm_pointer;
2079                 rtd->ops.ioctl          = soc_pcm_ioctl;
2080         }
2081
2082         if (platform->driver->ops) {
2083                 rtd->ops.ack            = platform->driver->ops->ack;
2084                 rtd->ops.copy           = platform->driver->ops->copy;
2085                 rtd->ops.silence        = platform->driver->ops->silence;
2086                 rtd->ops.page           = platform->driver->ops->page;
2087                 rtd->ops.mmap           = platform->driver->ops->mmap;
2088         }
2089
2090         if (playback)
2091                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2092
2093         if (capture)
2094                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2095
2096         if (platform->driver->pcm_new) {
2097                 ret = platform->driver->pcm_new(rtd);
2098                 if (ret < 0) {
2099                         dev_err(platform->dev,
2100                                 "ASoC: pcm constructor failed: %d\n",
2101                                 ret);
2102                         return ret;
2103                 }
2104         }
2105
2106         pcm->private_free = platform->driver->pcm_free;
2107 out:
2108         dev_info(rtd->card->dev, " %s <-> %s mapping ok\n", codec_dai->name,
2109                 cpu_dai->name);
2110         return ret;
2111 }
2112
2113 /* is the current PCM operation for this FE ? */
2114 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2115 {
2116         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2117                 return 1;
2118         return 0;
2119 }
2120 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2121
2122 /* is the current PCM operation for this BE ? */
2123 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2124                 struct snd_soc_pcm_runtime *be, int stream)
2125 {
2126         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2127            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2128                   be->dpcm[stream].runtime_update))
2129                 return 1;
2130         return 0;
2131 }
2132 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2133
2134 /* get the substream for this BE */
2135 struct snd_pcm_substream *
2136         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2137 {
2138         return be->pcm->streams[stream].substream;
2139 }
2140 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2141
2142 /* get the BE runtime state */
2143 enum snd_soc_dpcm_state
2144         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2145 {
2146         return be->dpcm[stream].state;
2147 }
2148 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2149
2150 /* set the BE runtime state */
2151 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2152                 int stream, enum snd_soc_dpcm_state state)
2153 {
2154         be->dpcm[stream].state = state;
2155 }
2156 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2157
2158 /*
2159  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2160  * are not running, paused or suspended for the specified stream direction.
2161  */
2162 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2163                 struct snd_soc_pcm_runtime *be, int stream)
2164 {
2165         struct snd_soc_dpcm *dpcm;
2166         int state;
2167
2168         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2169
2170                 if (dpcm->fe == fe)
2171                         continue;
2172
2173                 state = dpcm->fe->dpcm[stream].state;
2174                 if (state == SND_SOC_DPCM_STATE_START ||
2175                         state == SND_SOC_DPCM_STATE_PAUSED ||
2176                         state == SND_SOC_DPCM_STATE_SUSPEND)
2177                         return 0;
2178         }
2179
2180         /* it's safe to free/stop this BE DAI */
2181         return 1;
2182 }
2183 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2184
2185 /*
2186  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2187  * running, paused or suspended for the specified stream direction.
2188  */
2189 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2190                 struct snd_soc_pcm_runtime *be, int stream)
2191 {
2192         struct snd_soc_dpcm *dpcm;
2193         int state;
2194
2195         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2196
2197                 if (dpcm->fe == fe)
2198                         continue;
2199
2200                 state = dpcm->fe->dpcm[stream].state;
2201                 if (state == SND_SOC_DPCM_STATE_START ||
2202                         state == SND_SOC_DPCM_STATE_PAUSED ||
2203                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2204                         state == SND_SOC_DPCM_STATE_PREPARE)
2205                         return 0;
2206         }
2207
2208         /* it's safe to change hw_params */
2209         return 1;
2210 }
2211 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2212
2213 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2214                 int cmd, struct snd_soc_platform *platform)
2215 {
2216         if (platform->driver->ops->trigger)
2217                 return platform->driver->ops->trigger(substream, cmd);
2218         return 0;
2219 }
2220 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2221
2222 #ifdef CONFIG_DEBUG_FS
2223 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2224 {
2225         switch (state) {
2226         case SND_SOC_DPCM_STATE_NEW:
2227                 return "new";
2228         case SND_SOC_DPCM_STATE_OPEN:
2229                 return "open";
2230         case SND_SOC_DPCM_STATE_HW_PARAMS:
2231                 return "hw_params";
2232         case SND_SOC_DPCM_STATE_PREPARE:
2233                 return "prepare";
2234         case SND_SOC_DPCM_STATE_START:
2235                 return "start";
2236         case SND_SOC_DPCM_STATE_STOP:
2237                 return "stop";
2238         case SND_SOC_DPCM_STATE_SUSPEND:
2239                 return "suspend";
2240         case SND_SOC_DPCM_STATE_PAUSED:
2241                 return "paused";
2242         case SND_SOC_DPCM_STATE_HW_FREE:
2243                 return "hw_free";
2244         case SND_SOC_DPCM_STATE_CLOSE:
2245                 return "close";
2246         }
2247
2248         return "unknown";
2249 }
2250
2251 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2252                                 int stream, char *buf, size_t size)
2253 {
2254         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2255         struct snd_soc_dpcm *dpcm;
2256         ssize_t offset = 0;
2257
2258         /* FE state */
2259         offset += snprintf(buf + offset, size - offset,
2260                         "[%s - %s]\n", fe->dai_link->name,
2261                         stream ? "Capture" : "Playback");
2262
2263         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2264                         dpcm_state_string(fe->dpcm[stream].state));
2265
2266         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2267             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2268                 offset += snprintf(buf + offset, size - offset,
2269                                 "Hardware Params: "
2270                                 "Format = %s, Channels = %d, Rate = %d\n",
2271                                 snd_pcm_format_name(params_format(params)),
2272                                 params_channels(params),
2273                                 params_rate(params));
2274
2275         /* BEs state */
2276         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2277
2278         if (list_empty(&fe->dpcm[stream].be_clients)) {
2279                 offset += snprintf(buf + offset, size - offset,
2280                                 " No active DSP links\n");
2281                 goto out;
2282         }
2283
2284         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2285                 struct snd_soc_pcm_runtime *be = dpcm->be;
2286                 params = &dpcm->hw_params;
2287
2288                 offset += snprintf(buf + offset, size - offset,
2289                                 "- %s\n", be->dai_link->name);
2290
2291                 offset += snprintf(buf + offset, size - offset,
2292                                 "   State: %s\n",
2293                                 dpcm_state_string(be->dpcm[stream].state));
2294
2295                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2296                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2297                         offset += snprintf(buf + offset, size - offset,
2298                                 "   Hardware Params: "
2299                                 "Format = %s, Channels = %d, Rate = %d\n",
2300                                 snd_pcm_format_name(params_format(params)),
2301                                 params_channels(params),
2302                                 params_rate(params));
2303         }
2304
2305 out:
2306         return offset;
2307 }
2308
2309 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2310                                 size_t count, loff_t *ppos)
2311 {
2312         struct snd_soc_pcm_runtime *fe = file->private_data;
2313         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2314         char *buf;
2315
2316         buf = kmalloc(out_count, GFP_KERNEL);
2317         if (!buf)
2318                 return -ENOMEM;
2319
2320         if (fe->cpu_dai->driver->playback.channels_min)
2321                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2322                                         buf + offset, out_count - offset);
2323
2324         if (fe->cpu_dai->driver->capture.channels_min)
2325                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2326                                         buf + offset, out_count - offset);
2327
2328         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2329
2330         kfree(buf);
2331         return ret;
2332 }
2333
2334 static const struct file_operations dpcm_state_fops = {
2335         .open = simple_open,
2336         .read = dpcm_state_read_file,
2337         .llseek = default_llseek,
2338 };
2339
2340 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2341 {
2342         if (!rtd->dai_link)
2343                 return 0;
2344
2345         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2346                         rtd->card->debugfs_card_root);
2347         if (!rtd->debugfs_dpcm_root) {
2348                 dev_dbg(rtd->dev,
2349                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2350                          rtd->dai_link->name);
2351                 return -EINVAL;
2352         }
2353
2354         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2355                                                 rtd->debugfs_dpcm_root,
2356                                                 rtd, &dpcm_state_fops);
2357
2358         return 0;
2359 }
2360 #endif