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                  codec_dai->pop_wait ? "yes" : "no");
 338
 339         /* are we waiting on this codec DAI stream */
 340         if (codec_dai->pop_wait == 1) {
 341                 codec_dai->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         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 387                 snd_soc_dai_digital_mute(codec_dai, 1);
 388
 389         if (cpu_dai->driver->ops->shutdown)
 390                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 391
 392         if (codec_dai->driver->ops->shutdown)
 393                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 394
 395         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 396                 rtd->dai_link->ops->shutdown(substream);
 397
 398         if (platform->driver->ops && platform->driver->ops->close)
 399                 platform->driver->ops->close(substream);
 400         cpu_dai->runtime = NULL;
 401
 402         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 403                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 404                     rtd->dai_link->ignore_pmdown_time) {
 405                         /* powered down playback stream now */
 406                         snd_soc_dapm_stream_event(rtd,
 407                                                   SNDRV_PCM_STREAM_PLAYBACK,
 408                                                   SND_SOC_DAPM_STREAM_STOP);
 409                 } else {
 410                         /* start delayed pop wq here for playback streams */
 411                         codec_dai->pop_wait = 1;
 412                         schedule_delayed_work(&rtd->delayed_work,
 413                                 msecs_to_jiffies(rtd->pmdown_time));
 414                 }
 415         } else {
 416                 /* capture streams can be powered down now */
 417                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 418                                           SND_SOC_DAPM_STREAM_STOP);
 419         }
 420
 421         mutex_unlock(&rtd->pcm_mutex);
 422
 423         pm_runtime_put(platform->dev);
 424         pm_runtime_put(codec_dai->dev);
 425         pm_runtime_put(cpu_dai->dev);
 426
 427         return 0;
 428 }
 429
 430 /*
 431  * Called by ALSA when the PCM substream is prepared, can set format, sample
 432  * rate, etc.  This function is non atomic and can be called multiple times,
 433  * it can refer to the runtime info.
 434  */
 435 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 436 {
 437         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 438         struct snd_soc_platform *platform = rtd->platform;
 439         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 440         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 441         int ret = 0;
 442
 443         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 444
 445         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 446                 ret = rtd->dai_link->ops->prepare(substream);
 447                 if (ret < 0) {
 448                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 449                                 " %d\n", ret);
 450                         goto out;
 451                 }
 452         }
 453
 454         if (platform->driver->ops && platform->driver->ops->prepare) {
 455                 ret = platform->driver->ops->prepare(substream);
 456                 if (ret < 0) {
 457                         dev_err(platform->dev, "ASoC: platform prepare error:"
 458                                 " %d\n", ret);
 459                         goto out;
 460                 }
 461         }
 462
 463         if (codec_dai->driver->ops->prepare) {
 464                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
 465                 if (ret < 0) {
 466                         dev_err(codec_dai->dev, "ASoC: DAI prepare error: %d\n",
 467                                 ret);
 468                         goto out;
 469                 }
 470         }
 471
 472         if (cpu_dai->driver->ops->prepare) {
 473                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 474                 if (ret < 0) {
 475                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
 476                                 ret);
 477                         goto out;
 478                 }
 479         }
 480
 481         /* cancel any delayed stream shutdown that is pending */
 482         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 483             codec_dai->pop_wait) {
 484                 codec_dai->pop_wait = 0;
 485                 cancel_delayed_work(&rtd->delayed_work);
 486         }
 487
 488         snd_soc_dapm_stream_event(rtd, substream->stream,
 489                         SND_SOC_DAPM_STREAM_START);
 490
 491         snd_soc_dai_digital_mute(codec_dai, 0);
 492
 493 out:
 494         mutex_unlock(&rtd->pcm_mutex);
 495         return ret;
 496 }
 497
 498 /*
 499  * Called by ALSA when the hardware params are set by application. This
 500  * function can also be called multiple times and can allocate buffers
 501  * (using snd_pcm_lib_* ). It's non-atomic.
 502  */
 503 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 504                                 struct snd_pcm_hw_params *params)
 505 {
 506         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 507         struct snd_soc_platform *platform = rtd->platform;
 508         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 509         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 510         int ret = 0;
 511
 512         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 513
 514         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 515                 ret = rtd->dai_link->ops->hw_params(substream, params);
 516                 if (ret < 0) {
 517                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 518                                 " failed: %d\n", ret);
 519                         goto out;
 520                 }
 521         }
 522
 523         if (codec_dai->driver->ops->hw_params) {
 524                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
 525                 if (ret < 0) {
 526                         dev_err(codec_dai->dev, "ASoC: can't set %s hw params:"
 527                                 " %d\n", codec_dai->name, ret);
 528                         goto codec_err;
 529                 }
 530         }
 531
 532         if (cpu_dai->driver->ops->hw_params) {
 533                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
 534                 if (ret < 0) {
 535                         dev_err(cpu_dai->dev, "ASoC: %s hw params failed: %d\n",
 536                                 cpu_dai->name, ret);
 537                         goto interface_err;
 538                 }
 539         }
 540
 541         if (platform->driver->ops && platform->driver->ops->hw_params) {
 542                 ret = platform->driver->ops->hw_params(substream, params);
 543                 if (ret < 0) {
 544                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 545                                platform->name, ret);
 546                         goto platform_err;
 547                 }
 548         }
 549
 550         /* store the rate for each DAIs */
 551         cpu_dai->rate = params_rate(params);
 552         codec_dai->rate = params_rate(params);
 553
 554 out:
 555         mutex_unlock(&rtd->pcm_mutex);
 556         return ret;
 557
 558 platform_err:
 559         if (cpu_dai->driver->ops->hw_free)
 560                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 561
 562 interface_err:
 563         if (codec_dai->driver->ops->hw_free)
 564                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 565
 566 codec_err:
 567         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 568                 rtd->dai_link->ops->hw_free(substream);
 569
 570         mutex_unlock(&rtd->pcm_mutex);
 571         return ret;
 572 }
 573
 574 /*
 575  * Frees resources allocated by hw_params, can be called multiple times
 576  */
 577 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 578 {
 579         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 580         struct snd_soc_platform *platform = rtd->platform;
 581         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 582         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 583         struct snd_soc_codec *codec = rtd->codec;
 584
 585         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 586
 587         /* apply codec digital mute */
 588         if (!codec->active)
 589                 snd_soc_dai_digital_mute(codec_dai, 1);
 590
 591         /* free any machine hw params */
 592         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 593                 rtd->dai_link->ops->hw_free(substream);
 594
 595         /* free any DMA resources */
 596         if (platform->driver->ops && platform->driver->ops->hw_free)
 597                 platform->driver->ops->hw_free(substream);
 598
 599         /* now free hw params for the DAIs  */
 600         if (codec_dai->driver->ops->hw_free)
 601                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 602
 603         if (cpu_dai->driver->ops->hw_free)
 604                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 605
 606         mutex_unlock(&rtd->pcm_mutex);
 607         return 0;
 608 }
 609
 610 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 611 {
 612         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 613         struct snd_soc_platform *platform = rtd->platform;
 614         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 615         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 616         int ret;
 617
 618         if (codec_dai->driver->ops->trigger) {
 619                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
 620                 if (ret < 0)
 621                         return ret;
 622         }
 623
 624         if (platform->driver->ops && platform->driver->ops->trigger) {
 625                 ret = platform->driver->ops->trigger(substream, cmd);
 626                 if (ret < 0)
 627                         return ret;
 628         }
 629
 630         if (cpu_dai->driver->ops->trigger) {
 631                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 632                 if (ret < 0)
 633                         return ret;
 634         }
 635         return 0;
 636 }
 637
 638 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
 639                                    int cmd)
 640 {
 641         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 642         struct snd_soc_platform *platform = rtd->platform;
 643         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 644         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 645         int ret;
 646
 647         if (codec_dai->driver->ops->bespoke_trigger) {
 648                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
 649                 if (ret < 0)
 650                         return ret;
 651         }
 652
 653         if (platform->driver->bespoke_trigger) {
 654                 ret = platform->driver->bespoke_trigger(substream, cmd);
 655                 if (ret < 0)
 656                         return ret;
 657         }
 658
 659         if (cpu_dai->driver->ops->bespoke_trigger) {
 660                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
 661                 if (ret < 0)
 662                         return ret;
 663         }
 664         return 0;
 665 }
 666 /*
 667  * soc level wrapper for pointer callback
 668  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 669  * the runtime->delay will be updated accordingly.
 670  */
 671 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 672 {
 673         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 674         struct snd_soc_platform *platform = rtd->platform;
 675         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 676         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 677         struct snd_pcm_runtime *runtime = substream->runtime;
 678         snd_pcm_uframes_t offset = 0;
 679         snd_pcm_sframes_t delay = 0;
 680
 681         if (platform->driver->ops && platform->driver->ops->pointer)
 682                 offset = platform->driver->ops->pointer(substream);
 683
 684         if (cpu_dai->driver->ops->delay)
 685                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 686
 687         if (codec_dai->driver->ops->delay)
 688                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 689
 690         if (platform->driver->delay)
 691                 delay += platform->driver->delay(substream, codec_dai);
 692
 693         runtime->delay = delay;
 694
 695         return offset;
 696 }
 697
 698 /* connect a FE and BE */
 699 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
 700                 struct snd_soc_pcm_runtime *be, int stream)
 701 {
 702         struct snd_soc_dpcm *dpcm;
 703
 704         /* only add new dpcms */
 705         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 706                 if (dpcm->be == be && dpcm->fe == fe)
 707                         return 0;
 708         }
 709
 710         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
 711         if (!dpcm)
 712                 return -ENOMEM;
 713
 714         dpcm->be = be;
 715         dpcm->fe = fe;
 716         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
 717         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
 718         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
 719         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
 720
 721         dev_dbg(fe->dev, "  connected new DPCM %s path %s %s %s\n",
 722                         stream ? "capture" : "playback",  fe->dai_link->name,
 723                         stream ? "<-" : "->", be->dai_link->name);
 724
 725 #ifdef CONFIG_DEBUG_FS
 726         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
 727                         fe->debugfs_dpcm_root, &dpcm->state);
 728 #endif
 729         return 1;
 730 }
 731
 732 /* reparent a BE onto another FE */
 733 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
 734                         struct snd_soc_pcm_runtime *be, int stream)
 735 {
 736         struct snd_soc_dpcm *dpcm;
 737         struct snd_pcm_substream *fe_substream, *be_substream;
 738
 739         /* reparent if BE is connected to other FEs */
 740         if (!be->dpcm[stream].users)
 741                 return;
 742
 743         be_substream = snd_soc_dpcm_get_substream(be, stream);
 744
 745         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
 746                 if (dpcm->fe == fe)
 747                         continue;
 748
 749                 dev_dbg(fe->dev, "  reparent %s path %s %s %s\n",
 750                         stream ? "capture" : "playback",
 751                         dpcm->fe->dai_link->name,
 752                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 753
 754                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
 755                 be_substream->runtime = fe_substream->runtime;
 756                 break;
 757         }
 758 }
 759
 760 /* disconnect a BE and FE */
 761 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
 762 {
 763         struct snd_soc_dpcm *dpcm, *d;
 764
 765         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
 766                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
 767                                 stream ? "capture" : "playback",
 768                                 dpcm->be->dai_link->name);
 769
 770                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
 771                         continue;
 772
 773                 dev_dbg(fe->dev, "  freed DSP %s path %s %s %s\n",
 774                         stream ? "capture" : "playback", fe->dai_link->name,
 775                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 776
 777                 /* BEs still alive need new FE */
 778                 dpcm_be_reparent(fe, dpcm->be, stream);
 779
 780 #ifdef CONFIG_DEBUG_FS
 781                 debugfs_remove(dpcm->debugfs_state);
 782 #endif
 783                 list_del(&dpcm->list_be);
 784                 list_del(&dpcm->list_fe);
 785                 kfree(dpcm);
 786         }
 787 }
 788
 789 /* get BE for DAI widget and stream */
 790 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
 791                 struct snd_soc_dapm_widget *widget, int stream)
 792 {
 793         struct snd_soc_pcm_runtime *be;
 794         int i;
 795
 796         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 797                 for (i = 0; i < card->num_links; i++) {
 798                         be = &card->rtd[i];
 799
 800                         if (!be->dai_link->no_pcm)
 801                                 continue;
 802
 803                         if (be->cpu_dai->playback_widget == widget ||
 804                                 be->codec_dai->playback_widget == widget)
 805                                 return be;
 806                 }
 807         } else {
 808
 809                 for (i = 0; i < card->num_links; i++) {
 810                         be = &card->rtd[i];
 811
 812                         if (!be->dai_link->no_pcm)
 813                                 continue;
 814
 815                         if (be->cpu_dai->capture_widget == widget ||
 816                                 be->codec_dai->capture_widget == widget)
 817                                 return be;
 818                 }
 819         }
 820
 821         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
 822                 stream ? "capture" : "playback", widget->name);
 823         return NULL;
 824 }
 825
 826 static inline struct snd_soc_dapm_widget *
 827         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 828 {
 829         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 830                 return rtd->cpu_dai->playback_widget;
 831         else
 832                 return rtd->cpu_dai->capture_widget;
 833 }
 834
 835 static inline struct snd_soc_dapm_widget *
 836         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 837 {
 838         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 839                 return rtd->codec_dai->playback_widget;
 840         else
 841                 return rtd->codec_dai->capture_widget;
 842 }
 843
 844 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 845                 struct snd_soc_dapm_widget *widget)
 846 {
 847         int i;
 848
 849         for (i = 0; i < list->num_widgets; i++) {
 850                 if (widget == list->widgets[i])
 851                         return 1;
 852         }
 853
 854         return 0;
 855 }
 856
 857 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 858         int stream, struct snd_soc_dapm_widget_list **list_)
 859 {
 860         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
 861         struct snd_soc_dapm_widget_list *list;
 862         int paths;
 863
 864         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
 865                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
 866         if (list == NULL)
 867                 return -ENOMEM;
 868
 869         /* get number of valid DAI paths and their widgets */
 870         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
 871
 872         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
 873                         stream ? "capture" : "playback");
 874
 875         *list_ = list;
 876         return paths;
 877 }
 878
 879 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 880 {
 881         kfree(*list);
 882 }
 883
 884 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
 885         struct snd_soc_dapm_widget_list **list_)
 886 {
 887         struct snd_soc_dpcm *dpcm;
 888         struct snd_soc_dapm_widget_list *list = *list_;
 889         struct snd_soc_dapm_widget *widget;
 890         int prune = 0;
 891
 892         /* Destroy any old FE <--> BE connections */
 893         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 894
 895                 /* is there a valid CPU DAI widget for this BE */
 896                 widget = rtd_get_cpu_widget(dpcm->be, stream);
 897
 898                 /* prune the BE if it's no longer in our active list */
 899                 if (widget && widget_in_list(list, widget))
 900                         continue;
 901
 902                 /* is there a valid CODEC DAI widget for this BE */
 903                 widget = rtd_get_codec_widget(dpcm->be, stream);
 904
 905                 /* prune the BE if it's no longer in our active list */
 906                 if (widget && widget_in_list(list, widget))
 907                         continue;
 908
 909                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
 910                         stream ? "capture" : "playback",
 911                         dpcm->be->dai_link->name, fe->dai_link->name);
 912                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 913                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 914                 prune++;
 915         }
 916
 917         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
 918         return prune;
 919 }
 920
 921 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
 922         struct snd_soc_dapm_widget_list **list_)
 923 {
 924         struct snd_soc_card *card = fe->card;
 925         struct snd_soc_dapm_widget_list *list = *list_;
 926         struct snd_soc_pcm_runtime *be;
 927         int i, new = 0, err;
 928
 929         /* Create any new FE <--> BE connections */
 930         for (i = 0; i < list->num_widgets; i++) {
 931
 932                 if (list->widgets[i]->id != snd_soc_dapm_dai)
 933                         continue;
 934
 935                 /* is there a valid BE rtd for this widget */
 936                 be = dpcm_get_be(card, list->widgets[i], stream);
 937                 if (!be) {
 938                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
 939                                         list->widgets[i]->name);
 940                         continue;
 941                 }
 942
 943                 /* make sure BE is a real BE */
 944                 if (!be->dai_link->no_pcm)
 945                         continue;
 946
 947                 /* don't connect if FE is not running */
 948                 if (!fe->dpcm[stream].runtime)
 949                         continue;
 950
 951                 /* newly connected FE and BE */
 952                 err = dpcm_be_connect(fe, be, stream);
 953                 if (err < 0) {
 954                         dev_err(fe->dev, "ASoC: can't connect %s\n",
 955                                 list->widgets[i]->name);
 956                         break;
 957                 } else if (err == 0) /* already connected */
 958                         continue;
 959
 960                 /* new */
 961                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 962                 new++;
 963         }
 964
 965         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
 966         return new;
 967 }
 968
 969 /*
 970  * Find the corresponding BE DAIs that source or sink audio to this
 971  * FE substream.
 972  */
 973 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 974         int stream, struct snd_soc_dapm_widget_list **list, int new)
 975 {
 976         if (new)
 977                 return dpcm_add_paths(fe, stream, list);
 978         else
 979                 return dpcm_prune_paths(fe, stream, list);
 980 }
 981
 982 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
 983 {
 984         struct snd_soc_dpcm *dpcm;
 985
 986         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
 987                 dpcm->be->dpcm[stream].runtime_update =
 988                                                 SND_SOC_DPCM_UPDATE_NO;
 989 }
 990
 991 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
 992         int stream)
 993 {
 994         struct snd_soc_dpcm *dpcm;
 995
 996         /* disable any enabled and non active backends */
 997         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 998
 999                 struct snd_soc_pcm_runtime *be = dpcm->be;
1000                 struct snd_pcm_substream *be_substream =
1001                         snd_soc_dpcm_get_substream(be, stream);
1002
1003                 if (be->dpcm[stream].users == 0)
1004                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1005                                 stream ? "capture" : "playback",
1006                                 be->dpcm[stream].state);
1007
1008                 if (--be->dpcm[stream].users != 0)
1009                         continue;
1010
1011                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1012                         continue;
1013
1014                 soc_pcm_close(be_substream);
1015                 be_substream->runtime = NULL;
1016                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1017         }
1018 }
1019
1020 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1021 {
1022         struct snd_soc_dpcm *dpcm;
1023         int err, count = 0;
1024
1025         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1026         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1027
1028                 struct snd_soc_pcm_runtime *be = dpcm->be;
1029                 struct snd_pcm_substream *be_substream =
1030                         snd_soc_dpcm_get_substream(be, stream);
1031
1032                 /* is this op for this BE ? */
1033                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1034                         continue;
1035
1036                 /* first time the dpcm is open ? */
1037                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1038                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1039                                 stream ? "capture" : "playback",
1040                                 be->dpcm[stream].state);
1041
1042                 if (be->dpcm[stream].users++ != 0)
1043                         continue;
1044
1045                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1046                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1047                         continue;
1048
1049                 dev_dbg(be->dev, "ASoC: open BE %s\n", be->dai_link->name);
1050
1051                 be_substream->runtime = be->dpcm[stream].runtime;
1052                 err = soc_pcm_open(be_substream);
1053                 if (err < 0) {
1054                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1055                         be->dpcm[stream].users--;
1056                         if (be->dpcm[stream].users < 0)
1057                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1058                                         stream ? "capture" : "playback",
1059                                         be->dpcm[stream].state);
1060
1061                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1062                         goto unwind;
1063                 }
1064
1065                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1066                 count++;
1067         }
1068
1069         return count;
1070
1071 unwind:
1072         /* disable any enabled and non active backends */
1073         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1074                 struct snd_soc_pcm_runtime *be = dpcm->be;
1075                 struct snd_pcm_substream *be_substream =
1076                         snd_soc_dpcm_get_substream(be, stream);
1077
1078                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1079                         continue;
1080
1081                 if (be->dpcm[stream].users == 0)
1082                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1083                                 stream ? "capture" : "playback",
1084                                 be->dpcm[stream].state);
1085
1086                 if (--be->dpcm[stream].users != 0)
1087                         continue;
1088
1089                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1090                         continue;
1091
1092                 soc_pcm_close(be_substream);
1093                 be_substream->runtime = NULL;
1094                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1095         }
1096
1097         return err;
1098 }
1099
1100 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1101 {
1102         struct snd_pcm_runtime *runtime = substream->runtime;
1103         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1104         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1105         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1106
1107         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1108                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1109                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1110                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1111                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1112                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1113                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1114         } else {
1115                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1116                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1117                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1118                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1119                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1120                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1121         }
1122 }
1123
1124 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1125 {
1126         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1127         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1128         int stream = fe_substream->stream, ret = 0;
1129
1130         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1131
1132         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1133         if (ret < 0) {
1134                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1135                 goto be_err;
1136         }
1137
1138         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1139
1140         /* start the DAI frontend */
1141         ret = soc_pcm_open(fe_substream);
1142         if (ret < 0) {
1143                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1144                 goto unwind;
1145         }
1146
1147         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1148
1149         dpcm_set_fe_runtime(fe_substream);
1150         snd_pcm_limit_hw_rates(runtime);
1151
1152         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1153         return 0;
1154
1155 unwind:
1156         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1157 be_err:
1158         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1159         return ret;
1160 }
1161
1162 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1163 {
1164         struct snd_soc_dpcm *dpcm;
1165
1166         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1167         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1168
1169                 struct snd_soc_pcm_runtime *be = dpcm->be;
1170                 struct snd_pcm_substream *be_substream =
1171                         snd_soc_dpcm_get_substream(be, stream);
1172
1173                 /* is this op for this BE ? */
1174                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1175                         continue;
1176
1177                 if (be->dpcm[stream].users == 0)
1178                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1179                                 stream ? "capture" : "playback",
1180                                 be->dpcm[stream].state);
1181
1182                 if (--be->dpcm[stream].users != 0)
1183                         continue;
1184
1185                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1186                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1187                         continue;
1188
1189                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1190                         dpcm->fe->dai_link->name);
1191
1192                 soc_pcm_close(be_substream);
1193                 be_substream->runtime = NULL;
1194
1195                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1196         }
1197         return 0;
1198 }
1199
1200 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1201 {
1202         struct snd_soc_pcm_runtime *fe = substream->private_data;
1203         int stream = substream->stream;
1204
1205         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1206
1207         /* shutdown the BEs */
1208         dpcm_be_dai_shutdown(fe, substream->stream);
1209
1210         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1211
1212         /* now shutdown the frontend */
1213         soc_pcm_close(substream);
1214
1215         /* run the stream event for each BE */
1216         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1217
1218         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1219         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1220         return 0;
1221 }
1222
1223 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1224 {
1225         struct snd_soc_dpcm *dpcm;
1226
1227         /* only hw_params backends that are either sinks or sources
1228          * to this frontend DAI */
1229         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1230
1231                 struct snd_soc_pcm_runtime *be = dpcm->be;
1232                 struct snd_pcm_substream *be_substream =
1233                         snd_soc_dpcm_get_substream(be, stream);
1234
1235                 /* is this op for this BE ? */
1236                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1237                         continue;
1238
1239                 /* only free hw when no longer used - check all FEs */
1240                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1241                                 continue;
1242
1243                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1244                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1245                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
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                 return ret;
1734         }
1735
1736         /* keep going if FE state is > open */
1737         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1738                 return 0;
1739
1740         ret = dpcm_be_dai_hw_params(fe, stream);
1741         if (ret < 0) {
1742                 goto close;
1743                 return ret;
1744         }
1745
1746         /* keep going if FE state is > hw_params */
1747         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1748                 return 0;
1749
1750
1751         ret = dpcm_be_dai_prepare(fe, stream);
1752         if (ret < 0) {
1753                 goto hw_free;
1754                 return ret;
1755         }
1756
1757         /* run the stream event for each BE */
1758         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1759
1760         /* keep going if FE state is > prepare */
1761         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1762                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1763                 return 0;
1764
1765         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1766                 /* call trigger on the frontend - FE takes care of all BE triggers */
1767                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
1768                                 fe->dai_link->name);
1769
1770                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1771                 if (ret < 0) {
1772                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
1773                         goto hw_free;
1774                 }
1775         } else {
1776                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
1777                         fe->dai_link->name);
1778
1779                 ret = dpcm_be_dai_trigger(fe, stream,
1780                                         SNDRV_PCM_TRIGGER_START);
1781                 if (ret < 0) {
1782                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1783                         goto hw_free;
1784                 }
1785         }
1786
1787         return 0;
1788
1789 hw_free:
1790         dpcm_be_dai_hw_free(fe, stream);
1791 close:
1792         dpcm_be_dai_shutdown(fe, stream);
1793 disconnect:
1794         /* disconnect any non started BEs */
1795         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1796                 struct snd_soc_pcm_runtime *be = dpcm->be;
1797                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1798                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1799         }
1800
1801         return ret;
1802 }
1803
1804 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1805 {
1806         int ret;
1807
1808         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1809         ret = dpcm_run_update_startup(fe, stream);
1810         if (ret < 0)
1811                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
1812         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1813
1814         return ret;
1815 }
1816
1817 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1818 {
1819         int ret;
1820
1821         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1822         ret = dpcm_run_update_shutdown(fe, stream);
1823         if (ret < 0)
1824                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
1825         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1826
1827         return ret;
1828 }
1829
1830 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1831  * any DAI links.
1832  */
1833 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
1834 {
1835         struct snd_soc_card *card;
1836         int i, old, new, paths;
1837
1838         if (widget->codec)
1839                 card = widget->codec->card;
1840         else if (widget->platform)
1841                 card = widget->platform->card;
1842         else
1843                 return -EINVAL;
1844
1845         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1846         for (i = 0; i < card->num_rtd; i++) {
1847                 struct snd_soc_dapm_widget_list *list;
1848                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1849
1850                 /* make sure link is FE */
1851                 if (!fe->dai_link->dynamic)
1852                         continue;
1853
1854                 /* only check active links */
1855                 if (!fe->cpu_dai->active)
1856                         continue;
1857
1858                 /* DAPM sync will call this to update DSP paths */
1859                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
1860                         fe->dai_link->name);
1861
1862                 /* skip if FE doesn't have playback capability */
1863                 if (!fe->cpu_dai->driver->playback.channels_min)
1864                         goto capture;
1865
1866                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1867                 if (paths < 0) {
1868                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1869                                         fe->dai_link->name,  "playback");
1870                         mutex_unlock(&card->mutex);
1871                         return paths;
1872                 }
1873
1874                 /* update any new playback paths */
1875                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1876                 if (new) {
1877                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1878                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1879                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1880                 }
1881
1882                 /* update any old playback paths */
1883                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1884                 if (old) {
1885                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1886                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1887                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1888                 }
1889
1890 capture:
1891                 /* skip if FE doesn't have capture capability */
1892                 if (!fe->cpu_dai->driver->capture.channels_min)
1893                         continue;
1894
1895                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1896                 if (paths < 0) {
1897                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1898                                         fe->dai_link->name,  "capture");
1899                         mutex_unlock(&card->mutex);
1900                         return paths;
1901                 }
1902
1903                 /* update any new capture paths */
1904                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1905                 if (new) {
1906                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1907                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1908                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1909                 }
1910
1911                 /* update any old capture paths */
1912                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1913                 if (old) {
1914                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1915                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1916                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1917                 }
1918
1919                 dpcm_path_put(&list);
1920         }
1921
1922         mutex_unlock(&card->mutex);
1923         return 0;
1924 }
1925 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1926 {
1927         struct snd_soc_dpcm *dpcm;
1928         struct list_head *clients =
1929                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1930
1931         list_for_each_entry(dpcm, clients, list_be) {
1932
1933                 struct snd_soc_pcm_runtime *be = dpcm->be;
1934                 struct snd_soc_dai *dai = be->codec_dai;
1935                 struct snd_soc_dai_driver *drv = dai->driver;
1936
1937                 if (be->dai_link->ignore_suspend)
1938                         continue;
1939
1940                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
1941
1942                 if (drv->ops->digital_mute && dai->playback_active)
1943                                 drv->ops->digital_mute(dai, mute);
1944         }
1945
1946         return 0;
1947 }
1948
1949 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1950 {
1951         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1952         struct snd_soc_dpcm *dpcm;
1953         struct snd_soc_dapm_widget_list *list;
1954         int ret;
1955         int stream = fe_substream->stream;
1956
1957         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1958         fe->dpcm[stream].runtime = fe_substream->runtime;
1959
1960         if (dpcm_path_get(fe, stream, &list) <= 0) {
1961                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
1962                         fe->dai_link->name, stream ? "capture" : "playback");
1963         }
1964
1965         /* calculate valid and active FE <-> BE dpcms */
1966         dpcm_process_paths(fe, stream, &list, 1);
1967
1968         ret = dpcm_fe_dai_startup(fe_substream);
1969         if (ret < 0) {
1970                 /* clean up all links */
1971                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1972                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1973
1974                 dpcm_be_disconnect(fe, stream);
1975                 fe->dpcm[stream].runtime = NULL;
1976         }
1977
1978         dpcm_clear_pending_state(fe, stream);
1979         dpcm_path_put(&list);
1980         mutex_unlock(&fe->card->mutex);
1981         return ret;
1982 }
1983
1984 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1985 {
1986         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1987         struct snd_soc_dpcm *dpcm;
1988         int stream = fe_substream->stream, ret;
1989
1990         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1991         ret = dpcm_fe_dai_shutdown(fe_substream);
1992
1993         /* mark FE's links ready to prune */
1994         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1995                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1996
1997         dpcm_be_disconnect(fe, stream);
1998
1999         fe->dpcm[stream].runtime = NULL;
2000         mutex_unlock(&fe->card->mutex);
2001         return ret;
2002 }
2003
2004 /* create a new pcm */
2005 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2006 {
2007         struct snd_soc_platform *platform = rtd->platform;
2008         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2009         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2010         struct snd_pcm *pcm;
2011         char new_name[64];
2012         int ret = 0, playback = 0, capture = 0;
2013
2014         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2015                 if (cpu_dai->driver->playback.channels_min)
2016                         playback = 1;
2017                 if (cpu_dai->driver->capture.channels_min)
2018                         capture = 1;
2019         } else {
2020                 if (codec_dai->driver->playback.channels_min)
2021                         playback = 1;
2022                 if (codec_dai->driver->capture.channels_min)
2023                         capture = 1;
2024         }
2025
2026         /* create the PCM */
2027         if (rtd->dai_link->no_pcm) {
2028                 snprintf(new_name, sizeof(new_name), "(%s)",
2029                         rtd->dai_link->stream_name);
2030
2031                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2032                                 playback, capture, &pcm);
2033         } else {
2034                 if (rtd->dai_link->dynamic)
2035                         snprintf(new_name, sizeof(new_name), "%s (*)",
2036                                 rtd->dai_link->stream_name);
2037                 else
2038                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2039                                 rtd->dai_link->stream_name, codec_dai->name, num);
2040
2041                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2042                         capture, &pcm);
2043         }
2044         if (ret < 0) {
2045                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2046                         rtd->dai_link->name);
2047                 return ret;
2048         }
2049         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2050
2051         /* DAPM dai link stream work */
2052         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2053
2054         rtd->pcm = pcm;
2055         pcm->private_data = rtd;
2056
2057         if (rtd->dai_link->no_pcm) {
2058                 if (playback)
2059                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2060                 if (capture)
2061                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2062                 goto out;
2063         }
2064
2065         /* ASoC PCM operations */
2066         if (rtd->dai_link->dynamic) {
2067                 rtd->ops.open           = dpcm_fe_dai_open;
2068                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2069                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2070                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2071                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2072                 rtd->ops.close          = dpcm_fe_dai_close;
2073                 rtd->ops.pointer        = soc_pcm_pointer;
2074                 rtd->ops.ioctl          = soc_pcm_ioctl;
2075         } else {
2076                 rtd->ops.open           = soc_pcm_open;
2077                 rtd->ops.hw_params      = soc_pcm_hw_params;
2078                 rtd->ops.prepare        = soc_pcm_prepare;
2079                 rtd->ops.trigger        = soc_pcm_trigger;
2080                 rtd->ops.hw_free        = soc_pcm_hw_free;
2081                 rtd->ops.close          = soc_pcm_close;
2082                 rtd->ops.pointer        = soc_pcm_pointer;
2083                 rtd->ops.ioctl          = soc_pcm_ioctl;
2084         }
2085
2086         if (platform->driver->ops) {
2087                 rtd->ops.ack            = platform->driver->ops->ack;
2088                 rtd->ops.copy           = platform->driver->ops->copy;
2089                 rtd->ops.silence        = platform->driver->ops->silence;
2090                 rtd->ops.page           = platform->driver->ops->page;
2091                 rtd->ops.mmap           = platform->driver->ops->mmap;
2092         }
2093
2094         if (playback)
2095                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2096
2097         if (capture)
2098                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2099
2100         if (platform->driver->pcm_new) {
2101                 ret = platform->driver->pcm_new(rtd);
2102                 if (ret < 0) {
2103                         dev_err(platform->dev,
2104                                 "ASoC: pcm constructor failed: %d\n",
2105                                 ret);
2106                         return ret;
2107                 }
2108         }
2109
2110         pcm->private_free = platform->driver->pcm_free;
2111 out:
2112         dev_info(rtd->card->dev, " %s <-> %s mapping ok\n", codec_dai->name,
2113                 cpu_dai->name);
2114         return ret;
2115 }
2116
2117 /* is the current PCM operation for this FE ? */
2118 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2119 {
2120         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2121                 return 1;
2122         return 0;
2123 }
2124 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2125
2126 /* is the current PCM operation for this BE ? */
2127 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2128                 struct snd_soc_pcm_runtime *be, int stream)
2129 {
2130         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2131            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2132                   be->dpcm[stream].runtime_update))
2133                 return 1;
2134         return 0;
2135 }
2136 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2137
2138 /* get the substream for this BE */
2139 struct snd_pcm_substream *
2140         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2141 {
2142         return be->pcm->streams[stream].substream;
2143 }
2144 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2145
2146 /* get the BE runtime state */
2147 enum snd_soc_dpcm_state
2148         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2149 {
2150         return be->dpcm[stream].state;
2151 }
2152 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2153
2154 /* set the BE runtime state */
2155 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2156                 int stream, enum snd_soc_dpcm_state state)
2157 {
2158         be->dpcm[stream].state = state;
2159 }
2160 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2161
2162 /*
2163  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2164  * are not running, paused or suspended for the specified stream direction.
2165  */
2166 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2167                 struct snd_soc_pcm_runtime *be, int stream)
2168 {
2169         struct snd_soc_dpcm *dpcm;
2170         int state;
2171
2172         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2173
2174                 if (dpcm->fe == fe)
2175                         continue;
2176
2177                 state = dpcm->fe->dpcm[stream].state;
2178                 if (state == SND_SOC_DPCM_STATE_START ||
2179                         state == SND_SOC_DPCM_STATE_PAUSED ||
2180                         state == SND_SOC_DPCM_STATE_SUSPEND)
2181                         return 0;
2182         }
2183
2184         /* it's safe to free/stop this BE DAI */
2185         return 1;
2186 }
2187 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2188
2189 /*
2190  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2191  * running, paused or suspended for the specified stream direction.
2192  */
2193 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2194                 struct snd_soc_pcm_runtime *be, int stream)
2195 {
2196         struct snd_soc_dpcm *dpcm;
2197         int state;
2198
2199         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2200
2201                 if (dpcm->fe == fe)
2202                         continue;
2203
2204                 state = dpcm->fe->dpcm[stream].state;
2205                 if (state == SND_SOC_DPCM_STATE_START ||
2206                         state == SND_SOC_DPCM_STATE_PAUSED ||
2207                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2208                         state == SND_SOC_DPCM_STATE_PREPARE)
2209                         return 0;
2210         }
2211
2212         /* it's safe to change hw_params */
2213         return 1;
2214 }
2215 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2216
2217 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2218                 int cmd, struct snd_soc_platform *platform)
2219 {
2220         if (platform->driver->ops->trigger)
2221                 return platform->driver->ops->trigger(substream, cmd);
2222         return 0;
2223 }
2224 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2225
2226 #ifdef CONFIG_DEBUG_FS
2227 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2228 {
2229         switch (state) {
2230         case SND_SOC_DPCM_STATE_NEW:
2231                 return "new";
2232         case SND_SOC_DPCM_STATE_OPEN:
2233                 return "open";
2234         case SND_SOC_DPCM_STATE_HW_PARAMS:
2235                 return "hw_params";
2236         case SND_SOC_DPCM_STATE_PREPARE:
2237                 return "prepare";
2238         case SND_SOC_DPCM_STATE_START:
2239                 return "start";
2240         case SND_SOC_DPCM_STATE_STOP:
2241                 return "stop";
2242         case SND_SOC_DPCM_STATE_SUSPEND:
2243                 return "suspend";
2244         case SND_SOC_DPCM_STATE_PAUSED:
2245                 return "paused";
2246         case SND_SOC_DPCM_STATE_HW_FREE:
2247                 return "hw_free";
2248         case SND_SOC_DPCM_STATE_CLOSE:
2249                 return "close";
2250         }
2251
2252         return "unknown";
2253 }
2254
2255 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2256                                 int stream, char *buf, size_t size)
2257 {
2258         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2259         struct snd_soc_dpcm *dpcm;
2260         ssize_t offset = 0;
2261
2262         /* FE state */
2263         offset += snprintf(buf + offset, size - offset,
2264                         "[%s - %s]\n", fe->dai_link->name,
2265                         stream ? "Capture" : "Playback");
2266
2267         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2268                         dpcm_state_string(fe->dpcm[stream].state));
2269
2270         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2271             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2272                 offset += snprintf(buf + offset, size - offset,
2273                                 "Hardware Params: "
2274                                 "Format = %s, Channels = %d, Rate = %d\n",
2275                                 snd_pcm_format_name(params_format(params)),
2276                                 params_channels(params),
2277                                 params_rate(params));
2278
2279         /* BEs state */
2280         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2281
2282         if (list_empty(&fe->dpcm[stream].be_clients)) {
2283                 offset += snprintf(buf + offset, size - offset,
2284                                 " No active DSP links\n");
2285                 goto out;
2286         }
2287
2288         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2289                 struct snd_soc_pcm_runtime *be = dpcm->be;
2290                 params = &dpcm->hw_params;
2291
2292                 offset += snprintf(buf + offset, size - offset,
2293                                 "- %s\n", be->dai_link->name);
2294
2295                 offset += snprintf(buf + offset, size - offset,
2296                                 "   State: %s\n",
2297                                 dpcm_state_string(be->dpcm[stream].state));
2298
2299                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2300                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2301                         offset += snprintf(buf + offset, size - offset,
2302                                 "   Hardware Params: "
2303                                 "Format = %s, Channels = %d, Rate = %d\n",
2304                                 snd_pcm_format_name(params_format(params)),
2305                                 params_channels(params),
2306                                 params_rate(params));
2307         }
2308
2309 out:
2310         return offset;
2311 }
2312
2313 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2314                                 size_t count, loff_t *ppos)
2315 {
2316         struct snd_soc_pcm_runtime *fe = file->private_data;
2317         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2318         char *buf;
2319
2320         buf = kmalloc(out_count, GFP_KERNEL);
2321         if (!buf)
2322                 return -ENOMEM;
2323
2324         if (fe->cpu_dai->driver->playback.channels_min)
2325                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2326                                         buf + offset, out_count - offset);
2327
2328         if (fe->cpu_dai->driver->capture.channels_min)
2329                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2330                                         buf + offset, out_count - offset);
2331
2332         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2333
2334         kfree(buf);
2335         return ret;
2336 }
2337
2338 static const struct file_operations dpcm_state_fops = {
2339         .open = simple_open,
2340         .read = dpcm_state_read_file,
2341         .llseek = default_llseek,
2342 };
2343
2344 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2345 {
2346         if (!rtd->dai_link)
2347                 return 0;
2348
2349         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2350                         rtd->card->debugfs_card_root);
2351         if (!rtd->debugfs_dpcm_root) {
2352                 dev_dbg(rtd->dev,
2353                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2354                          rtd->dai_link->name);
2355                 return -EINVAL;
2356         }
2357
2358         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2359                                                 rtd->debugfs_dpcm_root,
2360                                                 rtd, &dpcm_state_fops);
2361
2362         return 0;
2363 }
2364 #endif