sound/soc/soc-pcm.c

   1 /*
   2  * soc-pcm.c  --  ALSA SoC PCM
   3  *
   4  * Copyright 2005 Wolfson Microelectronics PLC.
   5  * Copyright 2005 Openedhand Ltd.
   6  * Copyright (C) 2010 Slimlogic Ltd.
   7  * Copyright (C) 2010 Texas Instruments Inc.
   8  *
   9  * Authors: Liam Girdwood <lrg@ti.com>
  10  *          Mark Brown <broonie@opensource.wolfsonmicro.com>
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/slab.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/export.h>
  26 #include <linux/debugfs.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31 #include <sound/soc-dpcm.h>
  32 #include <sound/initval.h>
  33
  34 #define DPCM_MAX_BE_USERS       8
  35
  36 /**
  37  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
  38  * @substream: the pcm substream
  39  * @hw: the hardware parameters
  40  *
  41  * Sets the substream runtime hardware parameters.
  42  */
  43 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
  44         const struct snd_pcm_hardware *hw)
  45 {
  46         struct snd_pcm_runtime *runtime = substream->runtime;
  47         runtime->hw.info = hw->info;
  48         runtime->hw.formats = hw->formats;
  49         runtime->hw.period_bytes_min = hw->period_bytes_min;
  50         runtime->hw.period_bytes_max = hw->period_bytes_max;
  51         runtime->hw.periods_min = hw->periods_min;
  52         runtime->hw.periods_max = hw->periods_max;
  53         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
  54         runtime->hw.fifo_size = hw->fifo_size;
  55         return 0;
  56 }
  57 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
  58
  59 /* DPCM stream event, send event to FE and all active BEs. */
  60 static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
  61         int event)
  62 {
  63         struct snd_soc_dpcm *dpcm;
  64
  65         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
  66
  67                 struct snd_soc_pcm_runtime *be = dpcm->be;
  68
  69                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
  70                                 be->dai_link->name, event, dir);
  71
  72                 snd_soc_dapm_stream_event(be, dir, event);
  73         }
  74
  75         snd_soc_dapm_stream_event(fe, dir, event);
  76
  77         return 0;
  78 }
  79
  80 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
  81                                         struct snd_soc_dai *soc_dai)
  82 {
  83         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  84         int ret;
  85
  86         if (!soc_dai->driver->symmetric_rates &&
  87             !rtd->dai_link->symmetric_rates)
  88                 return 0;
  89
  90         /* This can happen if multiple streams are starting simultaneously -
  91          * the second can need to get its constraints before the first has
  92          * picked a rate.  Complain and allow the application to carry on.
  93          */
  94         if (!soc_dai->rate) {
  95                 dev_warn(soc_dai->dev,
  96                          "ASoC: Not enforcing symmetric_rates due to race\n");
  97                 return 0;
  98         }
  99
 100         dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n", soc_dai->rate);
 101
 102         ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 103                                            SNDRV_PCM_HW_PARAM_RATE,
 104                                            soc_dai->rate, soc_dai->rate);
 105         if (ret < 0) {
 106                 dev_err(soc_dai->dev,
 107                         "ASoC: Unable to apply rate symmetry constraint: %d\n",
 108                         ret);
 109                 return ret;
 110         }
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * List of sample sizes that might go over the bus for parameter
 117  * application.  There ought to be a wildcard sample size for things
 118  * like the DAC/ADC resolution to use but there isn't right now.
 119  */
 120 static int sample_sizes[] = {
 121         24, 32,
 122 };
 123
 124 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
 125                               struct snd_soc_dai *dai)
 126 {
 127         int ret, i, bits;
 128
 129         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 130                 bits = dai->driver->playback.sig_bits;
 131         else
 132                 bits = dai->driver->capture.sig_bits;
 133
 134         if (!bits)
 135                 return;
 136
 137         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
 138                 if (bits >= sample_sizes[i])
 139                         continue;
 140
 141                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
 142                                                    sample_sizes[i], bits);
 143                 if (ret != 0)
 144                         dev_warn(dai->dev,
 145                                  "ASoC: Failed to set MSB %d/%d: %d\n",
 146                                  bits, sample_sizes[i], ret);
 147         }
 148 }
 149
 150 static void soc_pcm_init_runtime_hw(struct snd_pcm_hardware *hw,
 151         struct snd_soc_pcm_stream *codec_stream,
 152         struct snd_soc_pcm_stream *cpu_stream)
 153 {
 154         hw->rate_min = max(codec_stream->rate_min, cpu_stream->rate_min);
 155         hw->rate_max = max(codec_stream->rate_max, cpu_stream->rate_max);
 156         hw->channels_min = max(codec_stream->channels_min,
 157                 cpu_stream->channels_min);
 158         hw->channels_max = min(codec_stream->channels_max,
 159                 cpu_stream->channels_max);
 160         hw->formats = codec_stream->formats & cpu_stream->formats;
 161         hw->rates = codec_stream->rates & cpu_stream->rates;
 162         if (codec_stream->rates
 163                 & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 164                 hw->rates |= cpu_stream->rates;
 165         if (cpu_stream->rates
 166                 & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 167                 hw->rates |= codec_stream->rates;
 168 }
 169
 170 /*
 171  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 172  * then initialized and any private data can be allocated. This also calls
 173  * startup for the cpu DAI, platform, machine and codec DAI.
 174  */
 175 static int soc_pcm_open(struct snd_pcm_substream *substream)
 176 {
 177         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 178         struct snd_pcm_runtime *runtime = substream->runtime;
 179         struct snd_soc_platform *platform = rtd->platform;
 180         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 181         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 182         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
 183         struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
 184         int ret = 0;
 185
 186         pm_runtime_get_sync(cpu_dai->dev);
 187         pm_runtime_get_sync(codec_dai->dev);
 188         pm_runtime_get_sync(platform->dev);
 189
 190         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 191
 192         /* startup the audio subsystem */
 193         if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
 194                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 195                 if (ret < 0) {
 196                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 197                                 " %s: %d\n", cpu_dai->name, ret);
 198                         goto out;
 199                 }
 200         }
 201
 202         if (platform->driver->ops && platform->driver->ops->open) {
 203                 ret = platform->driver->ops->open(substream);
 204                 if (ret < 0) {
 205                         dev_err(platform->dev, "ASoC: can't open platform"
 206                                 " %s: %d\n", platform->name, ret);
 207                         goto platform_err;
 208                 }
 209         }
 210
 211         if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
 212                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
 213                 if (ret < 0) {
 214                         dev_err(codec_dai->dev, "ASoC: can't open codec"
 215                                 " %s: %d\n", codec_dai->name, ret);
 216                         goto codec_dai_err;
 217                 }
 218         }
 219
 220         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 221                 ret = rtd->dai_link->ops->startup(substream);
 222                 if (ret < 0) {
 223                         pr_err("ASoC: %s startup failed: %d\n",
 224                                rtd->dai_link->name, ret);
 225                         goto machine_err;
 226                 }
 227         }
 228
 229         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 230         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 231                 goto dynamic;
 232
 233         /* Check that the codec and cpu DAIs are compatible */
 234         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 235                 soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->playback,
 236                         &cpu_dai_drv->playback);
 237         } else {
 238                 soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->capture,
 239                         &cpu_dai_drv->capture);
 240         }
 241
 242         ret = -EINVAL;
 243         snd_pcm_limit_hw_rates(runtime);
 244         if (!runtime->hw.rates) {
 245                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 246                         codec_dai->name, cpu_dai->name);
 247                 goto config_err;
 248         }
 249         if (!runtime->hw.formats) {
 250                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 251                         codec_dai->name, cpu_dai->name);
 252                 goto config_err;
 253         }
 254         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 255             runtime->hw.channels_min > runtime->hw.channels_max) {
 256                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 257                                 codec_dai->name, cpu_dai->name);
 258                 goto config_err;
 259         }
 260
 261         soc_pcm_apply_msb(substream, codec_dai);
 262         soc_pcm_apply_msb(substream, cpu_dai);
 263
 264         /* Symmetry only applies if we've already got an active stream. */
 265         if (cpu_dai->active) {
 266                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 267                 if (ret != 0)
 268                         goto config_err;
 269         }
 270
 271         if (codec_dai->active) {
 272                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
 273                 if (ret != 0)
 274                         goto config_err;
 275         }
 276
 277         pr_debug("ASoC: %s <-> %s info:\n",
 278                         codec_dai->name, cpu_dai->name);
 279         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 280         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 281                  runtime->hw.channels_max);
 282         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 283                  runtime->hw.rate_max);
 284
 285 dynamic:
 286         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 287                 cpu_dai->playback_active++;
 288                 codec_dai->playback_active++;
 289         } else {
 290                 cpu_dai->capture_active++;
 291                 codec_dai->capture_active++;
 292         }
 293         cpu_dai->active++;
 294         codec_dai->active++;
 295         rtd->codec->active++;
 296         mutex_unlock(&rtd->pcm_mutex);
 297         return 0;
 298
 299 config_err:
 300         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 301                 rtd->dai_link->ops->shutdown(substream);
 302
 303 machine_err:
 304         if (codec_dai->driver->ops->shutdown)
 305                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 306
 307 codec_dai_err:
 308         if (platform->driver->ops && platform->driver->ops->close)
 309                 platform->driver->ops->close(substream);
 310
 311 platform_err:
 312         if (cpu_dai->driver->ops->shutdown)
 313                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 314 out:
 315         mutex_unlock(&rtd->pcm_mutex);
 316
 317         pm_runtime_put(platform->dev);
 318         pm_runtime_put(codec_dai->dev);
 319         pm_runtime_put(cpu_dai->dev);
 320
 321         return ret;
 322 }
 323
 324 /*
 325  * Power down the audio subsystem pmdown_time msecs after close is called.
 326  * This is to ensure there are no pops or clicks in between any music tracks
 327  * due to DAPM power cycling.
 328  */
 329 static void close_delayed_work(struct work_struct *work)
 330 {
 331         struct snd_soc_pcm_runtime *rtd =
 332                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 333         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 334
 335         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 336
 337         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 338                  codec_dai->driver->playback.stream_name,
 339                  codec_dai->playback_active ? "active" : "inactive",
 340                  rtd->pop_wait ? "yes" : "no");
 341
 342         /* are we waiting on this codec DAI stream */
 343         if (rtd->pop_wait == 1) {
 344                 rtd->pop_wait = 0;
 345                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 346                                           SND_SOC_DAPM_STREAM_STOP);
 347         }
 348
 349         mutex_unlock(&rtd->pcm_mutex);
 350 }
 351
 352 /*
 353  * Called by ALSA when a PCM substream is closed. Private data can be
 354  * freed here. The cpu DAI, codec DAI, machine and platform are also
 355  * shutdown.
 356  */
 357 static int soc_pcm_close(struct snd_pcm_substream *substream)
 358 {
 359         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 360         struct snd_soc_platform *platform = rtd->platform;
 361         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 362         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 363         struct snd_soc_codec *codec = rtd->codec;
 364
 365         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 366
 367         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 368                 cpu_dai->playback_active--;
 369                 codec_dai->playback_active--;
 370         } else {
 371                 cpu_dai->capture_active--;
 372                 codec_dai->capture_active--;
 373         }
 374
 375         cpu_dai->active--;
 376         codec_dai->active--;
 377         codec->active--;
 378
 379         /* clear the corresponding DAIs rate when inactive */
 380         if (!cpu_dai->active)
 381                 cpu_dai->rate = 0;
 382
 383         if (!codec_dai->active)
 384                 codec_dai->rate = 0;
 385
 386         /* Muting the DAC suppresses artifacts caused during digital
 387          * shutdown, for example from stopping clocks.
 388          */
 389         snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
 390
 391         if (cpu_dai->driver->ops->shutdown)
 392                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 393
 394         if (codec_dai->driver->ops->shutdown)
 395                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 396
 397         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 398                 rtd->dai_link->ops->shutdown(substream);
 399
 400         if (platform->driver->ops && platform->driver->ops->close)
 401                 platform->driver->ops->close(substream);
 402         cpu_dai->runtime = NULL;
 403
 404         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 405                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 406                     rtd->dai_link->ignore_pmdown_time) {
 407                         /* powered down playback stream now */
 408                         snd_soc_dapm_stream_event(rtd,
 409                                                   SNDRV_PCM_STREAM_PLAYBACK,
 410                                                   SND_SOC_DAPM_STREAM_STOP);
 411                 } else {
 412                         /* start delayed pop wq here for playback streams */
 413                         rtd->pop_wait = 1;
 414                         queue_delayed_work(system_power_efficient_wq,
 415                                            &rtd->delayed_work,
 416                                            msecs_to_jiffies(rtd->pmdown_time));
 417                 }
 418         } else {
 419                 /* capture streams can be powered down now */
 420                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 421                                           SND_SOC_DAPM_STREAM_STOP);
 422         }
 423
 424         mutex_unlock(&rtd->pcm_mutex);
 425
 426         pm_runtime_put(platform->dev);
 427         pm_runtime_put(codec_dai->dev);
 428         pm_runtime_put(cpu_dai->dev);
 429
 430         return 0;
 431 }
 432
 433 /*
 434  * Called by ALSA when the PCM substream is prepared, can set format, sample
 435  * rate, etc.  This function is non atomic and can be called multiple times,
 436  * it can refer to the runtime info.
 437  */
 438 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 439 {
 440         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 441         struct snd_soc_platform *platform = rtd->platform;
 442         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 443         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 444         int ret = 0;
 445
 446         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 447
 448         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 449                 ret = rtd->dai_link->ops->prepare(substream);
 450                 if (ret < 0) {
 451                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 452                                 " %d\n", ret);
 453                         goto out;
 454                 }
 455         }
 456
 457         if (platform->driver->ops && platform->driver->ops->prepare) {
 458                 ret = platform->driver->ops->prepare(substream);
 459                 if (ret < 0) {
 460                         dev_err(platform->dev, "ASoC: platform prepare error:"
 461                                 " %d\n", ret);
 462                         goto out;
 463                 }
 464         }
 465
 466         if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
 467                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
 468                 if (ret < 0) {
 469                         dev_err(codec_dai->dev, "ASoC: DAI prepare error: %d\n",
 470                                 ret);
 471                         goto out;
 472                 }
 473         }
 474
 475         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 476                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 477                 if (ret < 0) {
 478                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
 479                                 ret);
 480                         goto out;
 481                 }
 482         }
 483
 484         /* cancel any delayed stream shutdown that is pending */
 485         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 486             rtd->pop_wait) {
 487                 rtd->pop_wait = 0;
 488                 cancel_delayed_work(&rtd->delayed_work);
 489         }
 490
 491         snd_soc_dapm_stream_event(rtd, substream->stream,
 492                         SND_SOC_DAPM_STREAM_START);
 493
 494         snd_soc_dai_digital_mute(codec_dai, 0, substream->stream);
 495
 496 out:
 497         mutex_unlock(&rtd->pcm_mutex);
 498         return ret;
 499 }
 500
 501 /*
 502  * Called by ALSA when the hardware params are set by application. This
 503  * function can also be called multiple times and can allocate buffers
 504  * (using snd_pcm_lib_* ). It's non-atomic.
 505  */
 506 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 507                                 struct snd_pcm_hw_params *params)
 508 {
 509         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 510         struct snd_soc_platform *platform = rtd->platform;
 511         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 512         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 513         int ret = 0;
 514
 515         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 516
 517         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 518                 ret = rtd->dai_link->ops->hw_params(substream, params);
 519                 if (ret < 0) {
 520                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 521                                 " failed: %d\n", ret);
 522                         goto out;
 523                 }
 524         }
 525
 526         if (codec_dai->driver->ops && codec_dai->driver->ops->hw_params) {
 527                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
 528                 if (ret < 0) {
 529                         dev_err(codec_dai->dev, "ASoC: can't set %s hw params:"
 530                                 " %d\n", codec_dai->name, ret);
 531                         goto codec_err;
 532                 }
 533         }
 534
 535         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_params) {
 536                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
 537                 if (ret < 0) {
 538                         dev_err(cpu_dai->dev, "ASoC: %s hw params failed: %d\n",
 539                                 cpu_dai->name, ret);
 540                         goto interface_err;
 541                 }
 542         }
 543
 544         if (platform->driver->ops && platform->driver->ops->hw_params) {
 545                 ret = platform->driver->ops->hw_params(substream, params);
 546                 if (ret < 0) {
 547                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 548                                platform->name, ret);
 549                         goto platform_err;
 550                 }
 551         }
 552
 553         /* store the rate for each DAIs */
 554         cpu_dai->rate = params_rate(params);
 555         codec_dai->rate = params_rate(params);
 556
 557 out:
 558         mutex_unlock(&rtd->pcm_mutex);
 559         return ret;
 560
 561 platform_err:
 562         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 563                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 564
 565 interface_err:
 566         if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 567                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 568
 569 codec_err:
 570         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 571                 rtd->dai_link->ops->hw_free(substream);
 572
 573         mutex_unlock(&rtd->pcm_mutex);
 574         return ret;
 575 }
 576
 577 /*
 578  * Frees resources allocated by hw_params, can be called multiple times
 579  */
 580 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 581 {
 582         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 583         struct snd_soc_platform *platform = rtd->platform;
 584         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 585         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 586         struct snd_soc_codec *codec = rtd->codec;
 587
 588         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 589
 590         /* apply codec digital mute */
 591         if (!codec->active)
 592                 snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
 593
 594         /* free any machine hw params */
 595         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 596                 rtd->dai_link->ops->hw_free(substream);
 597
 598         /* free any DMA resources */
 599         if (platform->driver->ops && platform->driver->ops->hw_free)
 600                 platform->driver->ops->hw_free(substream);
 601
 602         /* now free hw params for the DAIs  */
 603         if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 604                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 605
 606         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 607                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 608
 609         mutex_unlock(&rtd->pcm_mutex);
 610         return 0;
 611 }
 612
 613 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 614 {
 615         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 616         struct snd_soc_platform *platform = rtd->platform;
 617         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 618         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 619         int ret;
 620
 621         if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
 622                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
 623                 if (ret < 0)
 624                         return ret;
 625         }
 626
 627         if (platform->driver->ops && platform->driver->ops->trigger) {
 628                 ret = platform->driver->ops->trigger(substream, cmd);
 629                 if (ret < 0)
 630                         return ret;
 631         }
 632
 633         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
 634                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 635                 if (ret < 0)
 636                         return ret;
 637         }
 638         return 0;
 639 }
 640
 641 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
 642                                    int cmd)
 643 {
 644         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 645         struct snd_soc_platform *platform = rtd->platform;
 646         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 647         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 648         int ret;
 649
 650         if (codec_dai->driver->ops &&
 651             codec_dai->driver->ops->bespoke_trigger) {
 652                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
 653                 if (ret < 0)
 654                         return ret;
 655         }
 656
 657         if (platform->driver->ops && platform->driver->bespoke_trigger) {
 658                 ret = platform->driver->bespoke_trigger(substream, cmd);
 659                 if (ret < 0)
 660                         return ret;
 661         }
 662
 663         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
 664                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
 665                 if (ret < 0)
 666                         return ret;
 667         }
 668         return 0;
 669 }
 670 /*
 671  * soc level wrapper for pointer callback
 672  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 673  * the runtime->delay will be updated accordingly.
 674  */
 675 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 676 {
 677         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 678         struct snd_soc_platform *platform = rtd->platform;
 679         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 680         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 681         struct snd_pcm_runtime *runtime = substream->runtime;
 682         snd_pcm_uframes_t offset = 0;
 683         snd_pcm_sframes_t delay = 0;
 684
 685         if (platform->driver->ops && platform->driver->ops->pointer)
 686                 offset = platform->driver->ops->pointer(substream);
 687
 688         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
 689                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 690
 691         if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
 692                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 693
 694         if (platform->driver->delay)
 695                 delay += platform->driver->delay(substream, codec_dai);
 696
 697         runtime->delay = delay;
 698
 699         return offset;
 700 }
 701
 702 /* connect a FE and BE */
 703 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
 704                 struct snd_soc_pcm_runtime *be, int stream)
 705 {
 706         struct snd_soc_dpcm *dpcm;
 707
 708         /* only add new dpcms */
 709         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 710                 if (dpcm->be == be && dpcm->fe == fe)
 711                         return 0;
 712         }
 713
 714         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
 715         if (!dpcm)
 716                 return -ENOMEM;
 717
 718         dpcm->be = be;
 719         dpcm->fe = fe;
 720         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
 721         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
 722         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
 723         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
 724
 725         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
 726                         stream ? "capture" : "playback",  fe->dai_link->name,
 727                         stream ? "<-" : "->", be->dai_link->name);
 728
 729 #ifdef CONFIG_DEBUG_FS
 730         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
 731                         fe->debugfs_dpcm_root, &dpcm->state);
 732 #endif
 733         return 1;
 734 }
 735
 736 /* reparent a BE onto another FE */
 737 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
 738                         struct snd_soc_pcm_runtime *be, int stream)
 739 {
 740         struct snd_soc_dpcm *dpcm;
 741         struct snd_pcm_substream *fe_substream, *be_substream;
 742
 743         /* reparent if BE is connected to other FEs */
 744         if (!be->dpcm[stream].users)
 745                 return;
 746
 747         be_substream = snd_soc_dpcm_get_substream(be, stream);
 748
 749         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
 750                 if (dpcm->fe == fe)
 751                         continue;
 752
 753                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
 754                         stream ? "capture" : "playback",
 755                         dpcm->fe->dai_link->name,
 756                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 757
 758                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
 759                 be_substream->runtime = fe_substream->runtime;
 760                 break;
 761         }
 762 }
 763
 764 /* disconnect a BE and FE */
 765 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
 766 {
 767         struct snd_soc_dpcm *dpcm, *d;
 768
 769         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
 770                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
 771                                 stream ? "capture" : "playback",
 772                                 dpcm->be->dai_link->name);
 773
 774                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
 775                         continue;
 776
 777                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
 778                         stream ? "capture" : "playback", fe->dai_link->name,
 779                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 780
 781                 /* BEs still alive need new FE */
 782                 dpcm_be_reparent(fe, dpcm->be, stream);
 783
 784 #ifdef CONFIG_DEBUG_FS
 785                 debugfs_remove(dpcm->debugfs_state);
 786 #endif
 787                 list_del(&dpcm->list_be);
 788                 list_del(&dpcm->list_fe);
 789                 kfree(dpcm);
 790         }
 791 }
 792
 793 /* get BE for DAI widget and stream */
 794 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
 795                 struct snd_soc_dapm_widget *widget, int stream)
 796 {
 797         struct snd_soc_pcm_runtime *be;
 798         int i;
 799
 800         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 801                 for (i = 0; i < card->num_links; i++) {
 802                         be = &card->rtd[i];
 803
 804                         if (!be->dai_link->no_pcm)
 805                                 continue;
 806
 807                         if (be->cpu_dai->playback_widget == widget ||
 808                                 be->codec_dai->playback_widget == widget)
 809                                 return be;
 810                 }
 811         } else {
 812
 813                 for (i = 0; i < card->num_links; i++) {
 814                         be = &card->rtd[i];
 815
 816                         if (!be->dai_link->no_pcm)
 817                                 continue;
 818
 819                         if (be->cpu_dai->capture_widget == widget ||
 820                                 be->codec_dai->capture_widget == widget)
 821                                 return be;
 822                 }
 823         }
 824
 825         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
 826                 stream ? "capture" : "playback", widget->name);
 827         return NULL;
 828 }
 829
 830 static inline struct snd_soc_dapm_widget *
 831         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 832 {
 833         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 834                 return rtd->cpu_dai->playback_widget;
 835         else
 836                 return rtd->cpu_dai->capture_widget;
 837 }
 838
 839 static inline struct snd_soc_dapm_widget *
 840         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 841 {
 842         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 843                 return rtd->codec_dai->playback_widget;
 844         else
 845                 return rtd->codec_dai->capture_widget;
 846 }
 847
 848 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 849                 struct snd_soc_dapm_widget *widget)
 850 {
 851         int i;
 852
 853         for (i = 0; i < list->num_widgets; i++) {
 854                 if (widget == list->widgets[i])
 855                         return 1;
 856         }
 857
 858         return 0;
 859 }
 860
 861 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 862         int stream, struct snd_soc_dapm_widget_list **list_)
 863 {
 864         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
 865         struct snd_soc_dapm_widget_list *list;
 866         int paths;
 867
 868         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
 869                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
 870         if (list == NULL)
 871                 return -ENOMEM;
 872
 873         /* get number of valid DAI paths and their widgets */
 874         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
 875
 876         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
 877                         stream ? "capture" : "playback");
 878
 879         *list_ = list;
 880         return paths;
 881 }
 882
 883 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 884 {
 885         kfree(*list);
 886 }
 887
 888 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
 889         struct snd_soc_dapm_widget_list **list_)
 890 {
 891         struct snd_soc_dpcm *dpcm;
 892         struct snd_soc_dapm_widget_list *list = *list_;
 893         struct snd_soc_dapm_widget *widget;
 894         int prune = 0;
 895
 896         /* Destroy any old FE <--> BE connections */
 897         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 898
 899                 /* is there a valid CPU DAI widget for this BE */
 900                 widget = rtd_get_cpu_widget(dpcm->be, stream);
 901
 902                 /* prune the BE if it's no longer in our active list */
 903                 if (widget && widget_in_list(list, widget))
 904                         continue;
 905
 906                 /* is there a valid CODEC DAI widget for this BE */
 907                 widget = rtd_get_codec_widget(dpcm->be, stream);
 908
 909                 /* prune the BE if it's no longer in our active list */
 910                 if (widget && widget_in_list(list, widget))
 911                         continue;
 912
 913                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
 914                         stream ? "capture" : "playback",
 915                         dpcm->be->dai_link->name, fe->dai_link->name);
 916                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 917                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 918                 prune++;
 919         }
 920
 921         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
 922         return prune;
 923 }
 924
 925 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
 926         struct snd_soc_dapm_widget_list **list_)
 927 {
 928         struct snd_soc_card *card = fe->card;
 929         struct snd_soc_dapm_widget_list *list = *list_;
 930         struct snd_soc_pcm_runtime *be;
 931         int i, new = 0, err;
 932
 933         /* Create any new FE <--> BE connections */
 934         for (i = 0; i < list->num_widgets; i++) {
 935
 936                 switch (list->widgets[i]->id) {
 937                 case snd_soc_dapm_dai_in:
 938                 case snd_soc_dapm_dai_out:
 939                         break;
 940                 default:
 941                         continue;
 942                 }
 943
 944                 /* is there a valid BE rtd for this widget */
 945                 be = dpcm_get_be(card, list->widgets[i], stream);
 946                 if (!be) {
 947                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
 948                                         list->widgets[i]->name);
 949                         continue;
 950                 }
 951
 952                 /* make sure BE is a real BE */
 953                 if (!be->dai_link->no_pcm)
 954                         continue;
 955
 956                 /* don't connect if FE is not running */
 957                 if (!fe->dpcm[stream].runtime)
 958                         continue;
 959
 960                 /* newly connected FE and BE */
 961                 err = dpcm_be_connect(fe, be, stream);
 962                 if (err < 0) {
 963                         dev_err(fe->dev, "ASoC: can't connect %s\n",
 964                                 list->widgets[i]->name);
 965                         break;
 966                 } else if (err == 0) /* already connected */
 967                         continue;
 968
 969                 /* new */
 970                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 971                 new++;
 972         }
 973
 974         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
 975         return new;
 976 }
 977
 978 /*
 979  * Find the corresponding BE DAIs that source or sink audio to this
 980  * FE substream.
 981  */
 982 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 983         int stream, struct snd_soc_dapm_widget_list **list, int new)
 984 {
 985         if (new)
 986                 return dpcm_add_paths(fe, stream, list);
 987         else
 988                 return dpcm_prune_paths(fe, stream, list);
 989 }
 990
 991 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
 992 {
 993         struct snd_soc_dpcm *dpcm;
 994
 995         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
 996                 dpcm->be->dpcm[stream].runtime_update =
 997                                                 SND_SOC_DPCM_UPDATE_NO;
 998 }
 999
1000 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1001         int stream)
1002 {
1003         struct snd_soc_dpcm *dpcm;
1004
1005         /* disable any enabled and non active backends */
1006         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1007
1008                 struct snd_soc_pcm_runtime *be = dpcm->be;
1009                 struct snd_pcm_substream *be_substream =
1010                         snd_soc_dpcm_get_substream(be, stream);
1011
1012                 if (be->dpcm[stream].users == 0)
1013                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1014                                 stream ? "capture" : "playback",
1015                                 be->dpcm[stream].state);
1016
1017                 if (--be->dpcm[stream].users != 0)
1018                         continue;
1019
1020                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1021                         continue;
1022
1023                 soc_pcm_close(be_substream);
1024                 be_substream->runtime = NULL;
1025                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1026         }
1027 }
1028
1029 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1030 {
1031         struct snd_soc_dpcm *dpcm;
1032         int err, count = 0;
1033
1034         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1035         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1036
1037                 struct snd_soc_pcm_runtime *be = dpcm->be;
1038                 struct snd_pcm_substream *be_substream =
1039                         snd_soc_dpcm_get_substream(be, stream);
1040
1041                 /* is this op for this BE ? */
1042                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1043                         continue;
1044
1045                 /* first time the dpcm is open ? */
1046                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1047                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1048                                 stream ? "capture" : "playback",
1049                                 be->dpcm[stream].state);
1050
1051                 if (be->dpcm[stream].users++ != 0)
1052                         continue;
1053
1054                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1055                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1056                         continue;
1057
1058                 dev_dbg(be->dev, "ASoC: open BE %s\n", be->dai_link->name);
1059
1060                 be_substream->runtime = be->dpcm[stream].runtime;
1061                 err = soc_pcm_open(be_substream);
1062                 if (err < 0) {
1063                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1064                         be->dpcm[stream].users--;
1065                         if (be->dpcm[stream].users < 0)
1066                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1067                                         stream ? "capture" : "playback",
1068                                         be->dpcm[stream].state);
1069
1070                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1071                         goto unwind;
1072                 }
1073
1074                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1075                 count++;
1076         }
1077
1078         return count;
1079
1080 unwind:
1081         /* disable any enabled and non active backends */
1082         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1083                 struct snd_soc_pcm_runtime *be = dpcm->be;
1084                 struct snd_pcm_substream *be_substream =
1085                         snd_soc_dpcm_get_substream(be, stream);
1086
1087                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1088                         continue;
1089
1090                 if (be->dpcm[stream].users == 0)
1091                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1092                                 stream ? "capture" : "playback",
1093                                 be->dpcm[stream].state);
1094
1095                 if (--be->dpcm[stream].users != 0)
1096                         continue;
1097
1098                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1099                         continue;
1100
1101                 soc_pcm_close(be_substream);
1102                 be_substream->runtime = NULL;
1103                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1104         }
1105
1106         return err;
1107 }
1108
1109 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1110 {
1111         struct snd_pcm_runtime *runtime = substream->runtime;
1112         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1113         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1114         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1115
1116         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1117                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1118                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1119                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1120                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1121                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1122                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1123         } else {
1124                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1125                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1126                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1127                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1128                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1129                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1130         }
1131 }
1132
1133 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1134 {
1135         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1136         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1137         int stream = fe_substream->stream, ret = 0;
1138
1139         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1140
1141         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1142         if (ret < 0) {
1143                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1144                 goto be_err;
1145         }
1146
1147         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1148
1149         /* start the DAI frontend */
1150         ret = soc_pcm_open(fe_substream);
1151         if (ret < 0) {
1152                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1153                 goto unwind;
1154         }
1155
1156         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1157
1158         dpcm_set_fe_runtime(fe_substream);
1159         snd_pcm_limit_hw_rates(runtime);
1160
1161         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1162         return 0;
1163
1164 unwind:
1165         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1166 be_err:
1167         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1168         return ret;
1169 }
1170
1171 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1172 {
1173         struct snd_soc_dpcm *dpcm;
1174
1175         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1176         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1177
1178                 struct snd_soc_pcm_runtime *be = dpcm->be;
1179                 struct snd_pcm_substream *be_substream =
1180                         snd_soc_dpcm_get_substream(be, stream);
1181
1182                 /* is this op for this BE ? */
1183                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1184                         continue;
1185
1186                 if (be->dpcm[stream].users == 0)
1187                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1188                                 stream ? "capture" : "playback",
1189                                 be->dpcm[stream].state);
1190
1191                 if (--be->dpcm[stream].users != 0)
1192                         continue;
1193
1194                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1195                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1196                         continue;
1197
1198                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1199                         dpcm->fe->dai_link->name);
1200
1201                 soc_pcm_close(be_substream);
1202                 be_substream->runtime = NULL;
1203
1204                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1205         }
1206         return 0;
1207 }
1208
1209 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1210 {
1211         struct snd_soc_pcm_runtime *fe = substream->private_data;
1212         int stream = substream->stream;
1213
1214         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1215
1216         /* shutdown the BEs */
1217         dpcm_be_dai_shutdown(fe, substream->stream);
1218
1219         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1220
1221         /* now shutdown the frontend */
1222         soc_pcm_close(substream);
1223
1224         /* run the stream event for each BE */
1225         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1226
1227         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1228         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1229         return 0;
1230 }
1231
1232 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1233 {
1234         struct snd_soc_dpcm *dpcm;
1235
1236         /* only hw_params backends that are either sinks or sources
1237          * to this frontend DAI */
1238         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1239
1240                 struct snd_soc_pcm_runtime *be = dpcm->be;
1241                 struct snd_pcm_substream *be_substream =
1242                         snd_soc_dpcm_get_substream(be, stream);
1243
1244                 /* is this op for this BE ? */
1245                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1246                         continue;
1247
1248                 /* only free hw when no longer used - check all FEs */
1249                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1250                                 continue;
1251
1252                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1253                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1254                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1255                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1256                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1257                         continue;
1258
1259                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1260                         dpcm->fe->dai_link->name);
1261
1262                 soc_pcm_hw_free(be_substream);
1263
1264                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1265         }
1266
1267         return 0;
1268 }
1269
1270 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1271 {
1272         struct snd_soc_pcm_runtime *fe = substream->private_data;
1273         int err, stream = substream->stream;
1274
1275         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1276         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1277
1278         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1279
1280         /* call hw_free on the frontend */
1281         err = soc_pcm_hw_free(substream);
1282         if (err < 0)
1283                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1284                         fe->dai_link->name);
1285
1286         /* only hw_params backends that are either sinks or sources
1287          * to this frontend DAI */
1288         err = dpcm_be_dai_hw_free(fe, stream);
1289
1290         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1291         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1292
1293         mutex_unlock(&fe->card->mutex);
1294         return 0;
1295 }
1296
1297 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1298 {
1299         struct snd_soc_dpcm *dpcm;
1300         int ret;
1301
1302         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1303
1304                 struct snd_soc_pcm_runtime *be = dpcm->be;
1305                 struct snd_pcm_substream *be_substream =
1306                         snd_soc_dpcm_get_substream(be, stream);
1307
1308                 /* is this op for this BE ? */
1309                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1310                         continue;
1311
1312                 /* only allow hw_params() if no connected FEs are running */
1313                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1314                         continue;
1315
1316                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1317                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1318                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1319                         continue;
1320
1321                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1322                         dpcm->fe->dai_link->name);
1323
1324                 /* copy params for each dpcm */
1325                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1326                                 sizeof(struct snd_pcm_hw_params));
1327
1328                 /* perform any hw_params fixups */
1329                 if (be->dai_link->be_hw_params_fixup) {
1330                         ret = be->dai_link->be_hw_params_fixup(be,
1331                                         &dpcm->hw_params);
1332                         if (ret < 0) {
1333                                 dev_err(be->dev,
1334                                         "ASoC: hw_params BE fixup failed %d\n",
1335                                         ret);
1336                                 goto unwind;
1337                         }
1338                 }
1339
1340                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1341                 if (ret < 0) {
1342                         dev_err(dpcm->be->dev,
1343                                 "ASoC: hw_params BE failed %d\n", ret);
1344                         goto unwind;
1345                 }
1346
1347                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1348         }
1349         return 0;
1350
1351 unwind:
1352         /* disable any enabled and non active backends */
1353         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1354                 struct snd_soc_pcm_runtime *be = dpcm->be;
1355                 struct snd_pcm_substream *be_substream =
1356                         snd_soc_dpcm_get_substream(be, stream);
1357
1358                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1359                         continue;
1360
1361                 /* only allow hw_free() if no connected FEs are running */
1362                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1363                         continue;
1364
1365                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1366                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1367                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1368                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1369                         continue;
1370
1371                 soc_pcm_hw_free(be_substream);
1372         }
1373
1374         return ret;
1375 }
1376
1377 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1378                                  struct snd_pcm_hw_params *params)
1379 {
1380         struct snd_soc_pcm_runtime *fe = substream->private_data;
1381         int ret, stream = substream->stream;
1382
1383         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1384         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1385
1386         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1387                         sizeof(struct snd_pcm_hw_params));
1388         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1389         if (ret < 0) {
1390                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1391                 goto out;
1392         }
1393
1394         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1395                         fe->dai_link->name, params_rate(params),
1396                         params_channels(params), params_format(params));
1397
1398         /* call hw_params on the frontend */
1399         ret = soc_pcm_hw_params(substream, params);
1400         if (ret < 0) {
1401                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1402                 dpcm_be_dai_hw_free(fe, stream);
1403          } else
1404                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1405
1406 out:
1407         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1408         mutex_unlock(&fe->card->mutex);
1409         return ret;
1410 }
1411
1412 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1413                 struct snd_pcm_substream *substream, int cmd)
1414 {
1415         int ret;
1416
1417         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1418                         dpcm->fe->dai_link->name, cmd);
1419
1420         ret = soc_pcm_trigger(substream, cmd);
1421         if (ret < 0)
1422                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1423
1424         return ret;
1425 }
1426
1427 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1428                                int cmd)
1429 {
1430         struct snd_soc_dpcm *dpcm;
1431         int ret = 0;
1432
1433         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1434
1435                 struct snd_soc_pcm_runtime *be = dpcm->be;
1436                 struct snd_pcm_substream *be_substream =
1437                         snd_soc_dpcm_get_substream(be, stream);
1438
1439                 /* is this op for this BE ? */
1440                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1441                         continue;
1442
1443                 switch (cmd) {
1444                 case SNDRV_PCM_TRIGGER_START:
1445                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1446                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
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_RESUME:
1456                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
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_PAUSE_RELEASE:
1466                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1467                                 continue;
1468
1469                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1470                         if (ret)
1471                                 return ret;
1472
1473                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1474                         break;
1475                 case SNDRV_PCM_TRIGGER_STOP:
1476                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1477                                 continue;
1478
1479                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1480                                 continue;
1481
1482                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1483                         if (ret)
1484                                 return ret;
1485
1486                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1487                         break;
1488                 case SNDRV_PCM_TRIGGER_SUSPEND:
1489                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1490                                 continue;
1491
1492                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1493                                 continue;
1494
1495                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1496                         if (ret)
1497                                 return ret;
1498
1499                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1500                         break;
1501                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1502                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1503                                 continue;
1504
1505                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1506                                 continue;
1507
1508                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1509                         if (ret)
1510                                 return ret;
1511
1512                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1513                         break;
1514                 }
1515         }
1516
1517         return ret;
1518 }
1519 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1520
1521 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1522 {
1523         struct snd_soc_pcm_runtime *fe = substream->private_data;
1524         int stream = substream->stream, ret;
1525         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1526
1527         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1528
1529         switch (trigger) {
1530         case SND_SOC_DPCM_TRIGGER_PRE:
1531                 /* call trigger on the frontend before the backend. */
1532
1533                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1534                                 fe->dai_link->name, cmd);
1535
1536                 ret = soc_pcm_trigger(substream, cmd);
1537                 if (ret < 0) {
1538                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1539                         goto out;
1540                 }
1541
1542                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1543                 break;
1544         case SND_SOC_DPCM_TRIGGER_POST:
1545                 /* call trigger on the frontend after the backend. */
1546
1547                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1548                 if (ret < 0) {
1549                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1550                         goto out;
1551                 }
1552
1553                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1554                                 fe->dai_link->name, cmd);
1555
1556                 ret = soc_pcm_trigger(substream, cmd);
1557                 break;
1558         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1559                 /* bespoke trigger() - handles both FE and BEs */
1560
1561                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1562                                 fe->dai_link->name, cmd);
1563
1564                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1565                 if (ret < 0) {
1566                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1567                         goto out;
1568                 }
1569                 break;
1570         default:
1571                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1572                                 fe->dai_link->name);
1573                 ret = -EINVAL;
1574                 goto out;
1575         }
1576
1577         switch (cmd) {
1578         case SNDRV_PCM_TRIGGER_START:
1579         case SNDRV_PCM_TRIGGER_RESUME:
1580         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1581                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1582                 break;
1583         case SNDRV_PCM_TRIGGER_STOP:
1584         case SNDRV_PCM_TRIGGER_SUSPEND:
1585         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1586                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1587                 break;
1588         }
1589
1590 out:
1591         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1592         return ret;
1593 }
1594
1595 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1596 {
1597         struct snd_soc_dpcm *dpcm;
1598         int ret = 0;
1599
1600         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1601
1602                 struct snd_soc_pcm_runtime *be = dpcm->be;
1603                 struct snd_pcm_substream *be_substream =
1604                         snd_soc_dpcm_get_substream(be, stream);
1605
1606                 /* is this op for this BE ? */
1607                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1608                         continue;
1609
1610                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1611                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1612                         continue;
1613
1614                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
1615                         dpcm->fe->dai_link->name);
1616
1617                 ret = soc_pcm_prepare(be_substream);
1618                 if (ret < 0) {
1619                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
1620                                 ret);
1621                         break;
1622                 }
1623
1624                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1625         }
1626         return ret;
1627 }
1628
1629 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1630 {
1631         struct snd_soc_pcm_runtime *fe = substream->private_data;
1632         int stream = substream->stream, ret = 0;
1633
1634         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1635
1636         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
1637
1638         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1639
1640         /* there is no point preparing this FE if there are no BEs */
1641         if (list_empty(&fe->dpcm[stream].be_clients)) {
1642                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
1643                                 fe->dai_link->name);
1644                 ret = -EINVAL;
1645                 goto out;
1646         }
1647
1648         ret = dpcm_be_dai_prepare(fe, substream->stream);
1649         if (ret < 0)
1650                 goto out;
1651
1652         /* call prepare on the frontend */
1653         ret = soc_pcm_prepare(substream);
1654         if (ret < 0) {
1655                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
1656                         fe->dai_link->name);
1657                 goto out;
1658         }
1659
1660         /* run the stream event for each BE */
1661         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1662         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1663
1664 out:
1665         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1666         mutex_unlock(&fe->card->mutex);
1667
1668         return ret;
1669 }
1670
1671 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1672                      unsigned int cmd, void *arg)
1673 {
1674         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1675         struct snd_soc_platform *platform = rtd->platform;
1676
1677         if (platform->driver->ops && platform->driver->ops->ioctl)
1678                 return platform->driver->ops->ioctl(substream, cmd, arg);
1679         return snd_pcm_lib_ioctl(substream, cmd, arg);
1680 }
1681
1682 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1683 {
1684         struct snd_pcm_substream *substream =
1685                 snd_soc_dpcm_get_substream(fe, stream);
1686         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1687         int err;
1688
1689         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
1690                         stream ? "capture" : "playback", fe->dai_link->name);
1691
1692         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1693                 /* call bespoke trigger - FE takes care of all BE triggers */
1694                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
1695                                 fe->dai_link->name);
1696
1697                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1698                 if (err < 0)
1699                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1700         } else {
1701                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
1702                         fe->dai_link->name);
1703
1704                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1705                 if (err < 0)
1706                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1707         }
1708
1709         err = dpcm_be_dai_hw_free(fe, stream);
1710         if (err < 0)
1711                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
1712
1713         err = dpcm_be_dai_shutdown(fe, stream);
1714         if (err < 0)
1715                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
1716
1717         /* run the stream event for each BE */
1718         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1719
1720         return 0;
1721 }
1722
1723 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1724 {
1725         struct snd_pcm_substream *substream =
1726                 snd_soc_dpcm_get_substream(fe, stream);
1727         struct snd_soc_dpcm *dpcm;
1728         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1729         int ret;
1730
1731         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
1732                         stream ? "capture" : "playback", fe->dai_link->name);
1733
1734         /* Only start the BE if the FE is ready */
1735         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1736                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1737                 return -EINVAL;
1738
1739         /* startup must always be called for new BEs */
1740         ret = dpcm_be_dai_startup(fe, stream);
1741         if (ret < 0)
1742                 goto disconnect;
1743
1744         /* keep going if FE state is > open */
1745         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1746                 return 0;
1747
1748         ret = dpcm_be_dai_hw_params(fe, stream);
1749         if (ret < 0)
1750                 goto close;
1751
1752         /* keep going if FE state is > hw_params */
1753         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1754                 return 0;
1755
1756
1757         ret = dpcm_be_dai_prepare(fe, stream);
1758         if (ret < 0)
1759                 goto hw_free;
1760
1761         /* run the stream event for each BE */
1762         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1763
1764         /* keep going if FE state is > prepare */
1765         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1766                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1767                 return 0;
1768
1769         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1770                 /* call trigger on the frontend - FE takes care of all BE triggers */
1771                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
1772                                 fe->dai_link->name);
1773
1774                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1775                 if (ret < 0) {
1776                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
1777                         goto hw_free;
1778                 }
1779         } else {
1780                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
1781                         fe->dai_link->name);
1782
1783                 ret = dpcm_be_dai_trigger(fe, stream,
1784                                         SNDRV_PCM_TRIGGER_START);
1785                 if (ret < 0) {
1786                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1787                         goto hw_free;
1788                 }
1789         }
1790
1791         return 0;
1792
1793 hw_free:
1794         dpcm_be_dai_hw_free(fe, stream);
1795 close:
1796         dpcm_be_dai_shutdown(fe, stream);
1797 disconnect:
1798         /* disconnect any non started BEs */
1799         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1800                 struct snd_soc_pcm_runtime *be = dpcm->be;
1801                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1802                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1803         }
1804
1805         return ret;
1806 }
1807
1808 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1809 {
1810         int ret;
1811
1812         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1813         ret = dpcm_run_update_startup(fe, stream);
1814         if (ret < 0)
1815                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
1816         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1817
1818         return ret;
1819 }
1820
1821 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1822 {
1823         int ret;
1824
1825         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1826         ret = dpcm_run_update_shutdown(fe, stream);
1827         if (ret < 0)
1828                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
1829         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1830
1831         return ret;
1832 }
1833
1834 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1835  * any DAI links.
1836  */
1837 int soc_dpcm_runtime_update(struct snd_soc_card *card)
1838 {
1839         int i, old, new, paths;
1840
1841         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1842         for (i = 0; i < card->num_rtd; i++) {
1843                 struct snd_soc_dapm_widget_list *list;
1844                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1845
1846                 /* make sure link is FE */
1847                 if (!fe->dai_link->dynamic)
1848                         continue;
1849
1850                 /* only check active links */
1851                 if (!fe->cpu_dai->active)
1852                         continue;
1853
1854                 /* DAPM sync will call this to update DSP paths */
1855                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
1856                         fe->dai_link->name);
1857
1858                 /* skip if FE doesn't have playback capability */
1859                 if (!fe->cpu_dai->driver->playback.channels_min)
1860                         goto capture;
1861
1862                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1863                 if (paths < 0) {
1864                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1865                                         fe->dai_link->name,  "playback");
1866                         mutex_unlock(&card->mutex);
1867                         return paths;
1868                 }
1869
1870                 /* update any new playback paths */
1871                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1872                 if (new) {
1873                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1874                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1875                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1876                 }
1877
1878                 /* update any old playback paths */
1879                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1880                 if (old) {
1881                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1882                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1883                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1884                 }
1885
1886 capture:
1887                 /* skip if FE doesn't have capture capability */
1888                 if (!fe->cpu_dai->driver->capture.channels_min)
1889                         continue;
1890
1891                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1892                 if (paths < 0) {
1893                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1894                                         fe->dai_link->name,  "capture");
1895                         mutex_unlock(&card->mutex);
1896                         return paths;
1897                 }
1898
1899                 /* update any new capture paths */
1900                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1901                 if (new) {
1902                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1903                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1904                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1905                 }
1906
1907                 /* update any old capture paths */
1908                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1909                 if (old) {
1910                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1911                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1912                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1913                 }
1914
1915                 dpcm_path_put(&list);
1916         }
1917
1918         mutex_unlock(&card->mutex);
1919         return 0;
1920 }
1921 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1922 {
1923         struct snd_soc_dpcm *dpcm;
1924         struct list_head *clients =
1925                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1926
1927         list_for_each_entry(dpcm, clients, list_be) {
1928
1929                 struct snd_soc_pcm_runtime *be = dpcm->be;
1930                 struct snd_soc_dai *dai = be->codec_dai;
1931                 struct snd_soc_dai_driver *drv = dai->driver;
1932
1933                 if (be->dai_link->ignore_suspend)
1934                         continue;
1935
1936                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
1937
1938                 if (drv->ops && drv->ops->digital_mute && dai->playback_active)
1939                         drv->ops->digital_mute(dai, mute);
1940         }
1941
1942         return 0;
1943 }
1944
1945 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1946 {
1947         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1948         struct snd_soc_dpcm *dpcm;
1949         struct snd_soc_dapm_widget_list *list;
1950         int ret;
1951         int stream = fe_substream->stream;
1952
1953         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1954         fe->dpcm[stream].runtime = fe_substream->runtime;
1955
1956         if (dpcm_path_get(fe, stream, &list) <= 0) {
1957                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
1958                         fe->dai_link->name, stream ? "capture" : "playback");
1959         }
1960
1961         /* calculate valid and active FE <-> BE dpcms */
1962         dpcm_process_paths(fe, stream, &list, 1);
1963
1964         ret = dpcm_fe_dai_startup(fe_substream);
1965         if (ret < 0) {
1966                 /* clean up all links */
1967                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1968                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1969
1970                 dpcm_be_disconnect(fe, stream);
1971                 fe->dpcm[stream].runtime = NULL;
1972         }
1973
1974         dpcm_clear_pending_state(fe, stream);
1975         dpcm_path_put(&list);
1976         mutex_unlock(&fe->card->mutex);
1977         return ret;
1978 }
1979
1980 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1981 {
1982         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1983         struct snd_soc_dpcm *dpcm;
1984         int stream = fe_substream->stream, ret;
1985
1986         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1987         ret = dpcm_fe_dai_shutdown(fe_substream);
1988
1989         /* mark FE's links ready to prune */
1990         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1991                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1992
1993         dpcm_be_disconnect(fe, stream);
1994
1995         fe->dpcm[stream].runtime = NULL;
1996         mutex_unlock(&fe->card->mutex);
1997         return ret;
1998 }
1999
2000 /* create a new pcm */
2001 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2002 {
2003         struct snd_soc_platform *platform = rtd->platform;
2004         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2005         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2006         struct snd_pcm *pcm;
2007         char new_name[64];
2008         int ret = 0, playback = 0, capture = 0;
2009
2010         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2011                 if (cpu_dai->driver->playback.channels_min)
2012                         playback = 1;
2013                 if (cpu_dai->driver->capture.channels_min)
2014                         capture = 1;
2015         } else {
2016                 if (codec_dai->driver->playback.channels_min &&
2017                     cpu_dai->driver->playback.channels_min)
2018                         playback = 1;
2019                 if (codec_dai->driver->capture.channels_min &&
2020                     cpu_dai->driver->capture.channels_min)
2021                         capture = 1;
2022         }
2023
2024         if (rtd->dai_link->playback_only) {
2025                 playback = 1;
2026                 capture = 0;
2027         }
2028
2029         if (rtd->dai_link->capture_only) {
2030                 playback = 0;
2031                 capture = 1;
2032         }
2033
2034         /* create the PCM */
2035         if (rtd->dai_link->no_pcm) {
2036                 snprintf(new_name, sizeof(new_name), "(%s)",
2037                         rtd->dai_link->stream_name);
2038
2039                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2040                                 playback, capture, &pcm);
2041         } else {
2042                 if (rtd->dai_link->dynamic)
2043                         snprintf(new_name, sizeof(new_name), "%s (*)",
2044                                 rtd->dai_link->stream_name);
2045                 else
2046                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2047                                 rtd->dai_link->stream_name, codec_dai->name, num);
2048
2049                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2050                         capture, &pcm);
2051         }
2052         if (ret < 0) {
2053                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2054                         rtd->dai_link->name);
2055                 return ret;
2056         }
2057         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2058
2059         /* DAPM dai link stream work */
2060         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2061
2062         rtd->pcm = pcm;
2063         pcm->private_data = rtd;
2064
2065         if (rtd->dai_link->no_pcm) {
2066                 if (playback)
2067                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2068                 if (capture)
2069                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2070                 goto out;
2071         }
2072
2073         /* ASoC PCM operations */
2074         if (rtd->dai_link->dynamic) {
2075                 rtd->ops.open           = dpcm_fe_dai_open;
2076                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2077                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2078                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2079                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2080                 rtd->ops.close          = dpcm_fe_dai_close;
2081                 rtd->ops.pointer        = soc_pcm_pointer;
2082                 rtd->ops.ioctl          = soc_pcm_ioctl;
2083         } else {
2084                 rtd->ops.open           = soc_pcm_open;
2085                 rtd->ops.hw_params      = soc_pcm_hw_params;
2086                 rtd->ops.prepare        = soc_pcm_prepare;
2087                 rtd->ops.trigger        = soc_pcm_trigger;
2088                 rtd->ops.hw_free        = soc_pcm_hw_free;
2089                 rtd->ops.close          = soc_pcm_close;
2090                 rtd->ops.pointer        = soc_pcm_pointer;
2091                 rtd->ops.ioctl          = soc_pcm_ioctl;
2092         }
2093
2094         if (platform->driver->ops) {
2095                 rtd->ops.ack            = platform->driver->ops->ack;
2096                 rtd->ops.copy           = platform->driver->ops->copy;
2097                 rtd->ops.silence        = platform->driver->ops->silence;
2098                 rtd->ops.page           = platform->driver->ops->page;
2099                 rtd->ops.mmap           = platform->driver->ops->mmap;
2100         }
2101
2102         if (playback)
2103                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2104
2105         if (capture)
2106                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2107
2108         if (platform->driver->pcm_new) {
2109                 ret = platform->driver->pcm_new(rtd);
2110                 if (ret < 0) {
2111                         dev_err(platform->dev,
2112                                 "ASoC: pcm constructor failed: %d\n",
2113                                 ret);
2114                         return ret;
2115                 }
2116         }
2117
2118         pcm->private_free = platform->driver->pcm_free;
2119 out:
2120         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n", codec_dai->name,
2121                 cpu_dai->name);
2122         return ret;
2123 }
2124
2125 /* is the current PCM operation for this FE ? */
2126 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2127 {
2128         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2129                 return 1;
2130         return 0;
2131 }
2132 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2133
2134 /* is the current PCM operation for this BE ? */
2135 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2136                 struct snd_soc_pcm_runtime *be, int stream)
2137 {
2138         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2139            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2140                   be->dpcm[stream].runtime_update))
2141                 return 1;
2142         return 0;
2143 }
2144 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2145
2146 /* get the substream for this BE */
2147 struct snd_pcm_substream *
2148         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2149 {
2150         return be->pcm->streams[stream].substream;
2151 }
2152 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2153
2154 /* get the BE runtime state */
2155 enum snd_soc_dpcm_state
2156         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2157 {
2158         return be->dpcm[stream].state;
2159 }
2160 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2161
2162 /* set the BE runtime state */
2163 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2164                 int stream, enum snd_soc_dpcm_state state)
2165 {
2166         be->dpcm[stream].state = state;
2167 }
2168 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2169
2170 /*
2171  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2172  * are not running, paused or suspended for the specified stream direction.
2173  */
2174 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2175                 struct snd_soc_pcm_runtime *be, int stream)
2176 {
2177         struct snd_soc_dpcm *dpcm;
2178         int state;
2179
2180         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2181
2182                 if (dpcm->fe == fe)
2183                         continue;
2184
2185                 state = dpcm->fe->dpcm[stream].state;
2186                 if (state == SND_SOC_DPCM_STATE_START ||
2187                         state == SND_SOC_DPCM_STATE_PAUSED ||
2188                         state == SND_SOC_DPCM_STATE_SUSPEND)
2189                         return 0;
2190         }
2191
2192         /* it's safe to free/stop this BE DAI */
2193         return 1;
2194 }
2195 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2196
2197 /*
2198  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2199  * running, paused or suspended for the specified stream direction.
2200  */
2201 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2202                 struct snd_soc_pcm_runtime *be, int stream)
2203 {
2204         struct snd_soc_dpcm *dpcm;
2205         int state;
2206
2207         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2208
2209                 if (dpcm->fe == fe)
2210                         continue;
2211
2212                 state = dpcm->fe->dpcm[stream].state;
2213                 if (state == SND_SOC_DPCM_STATE_START ||
2214                         state == SND_SOC_DPCM_STATE_PAUSED ||
2215                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2216                         state == SND_SOC_DPCM_STATE_PREPARE)
2217                         return 0;
2218         }
2219
2220         /* it's safe to change hw_params */
2221         return 1;
2222 }
2223 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2224
2225 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2226                 int cmd, struct snd_soc_platform *platform)
2227 {
2228         if (platform->driver->ops && platform->driver->ops->trigger)
2229                 return platform->driver->ops->trigger(substream, cmd);
2230         return 0;
2231 }
2232 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2233
2234 #ifdef CONFIG_DEBUG_FS
2235 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2236 {
2237         switch (state) {
2238         case SND_SOC_DPCM_STATE_NEW:
2239                 return "new";
2240         case SND_SOC_DPCM_STATE_OPEN:
2241                 return "open";
2242         case SND_SOC_DPCM_STATE_HW_PARAMS:
2243                 return "hw_params";
2244         case SND_SOC_DPCM_STATE_PREPARE:
2245                 return "prepare";
2246         case SND_SOC_DPCM_STATE_START:
2247                 return "start";
2248         case SND_SOC_DPCM_STATE_STOP:
2249                 return "stop";
2250         case SND_SOC_DPCM_STATE_SUSPEND:
2251                 return "suspend";
2252         case SND_SOC_DPCM_STATE_PAUSED:
2253                 return "paused";
2254         case SND_SOC_DPCM_STATE_HW_FREE:
2255                 return "hw_free";
2256         case SND_SOC_DPCM_STATE_CLOSE:
2257                 return "close";
2258         }
2259
2260         return "unknown";
2261 }
2262
2263 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2264                                 int stream, char *buf, size_t size)
2265 {
2266         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2267         struct snd_soc_dpcm *dpcm;
2268         ssize_t offset = 0;
2269
2270         /* FE state */
2271         offset += snprintf(buf + offset, size - offset,
2272                         "[%s - %s]\n", fe->dai_link->name,
2273                         stream ? "Capture" : "Playback");
2274
2275         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2276                         dpcm_state_string(fe->dpcm[stream].state));
2277
2278         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2279             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2280                 offset += snprintf(buf + offset, size - offset,
2281                                 "Hardware Params: "
2282                                 "Format = %s, Channels = %d, Rate = %d\n",
2283                                 snd_pcm_format_name(params_format(params)),
2284                                 params_channels(params),
2285                                 params_rate(params));
2286
2287         /* BEs state */
2288         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2289
2290         if (list_empty(&fe->dpcm[stream].be_clients)) {
2291                 offset += snprintf(buf + offset, size - offset,
2292                                 " No active DSP links\n");
2293                 goto out;
2294         }
2295
2296         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2297                 struct snd_soc_pcm_runtime *be = dpcm->be;
2298                 params = &dpcm->hw_params;
2299
2300                 offset += snprintf(buf + offset, size - offset,
2301                                 "- %s\n", be->dai_link->name);
2302
2303                 offset += snprintf(buf + offset, size - offset,
2304                                 "   State: %s\n",
2305                                 dpcm_state_string(be->dpcm[stream].state));
2306
2307                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2308                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2309                         offset += snprintf(buf + offset, size - offset,
2310                                 "   Hardware Params: "
2311                                 "Format = %s, Channels = %d, Rate = %d\n",
2312                                 snd_pcm_format_name(params_format(params)),
2313                                 params_channels(params),
2314                                 params_rate(params));
2315         }
2316
2317 out:
2318         return offset;
2319 }
2320
2321 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2322                                 size_t count, loff_t *ppos)
2323 {
2324         struct snd_soc_pcm_runtime *fe = file->private_data;
2325         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2326         char *buf;
2327
2328         buf = kmalloc(out_count, GFP_KERNEL);
2329         if (!buf)
2330                 return -ENOMEM;
2331
2332         if (fe->cpu_dai->driver->playback.channels_min)
2333                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2334                                         buf + offset, out_count - offset);
2335
2336         if (fe->cpu_dai->driver->capture.channels_min)
2337                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2338                                         buf + offset, out_count - offset);
2339
2340         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2341
2342         kfree(buf);
2343         return ret;
2344 }
2345
2346 static const struct file_operations dpcm_state_fops = {
2347         .open = simple_open,
2348         .read = dpcm_state_read_file,
2349         .llseek = default_llseek,
2350 };
2351
2352 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2353 {
2354         if (!rtd->dai_link)
2355                 return 0;
2356
2357         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2358                         rtd->card->debugfs_card_root);
2359         if (!rtd->debugfs_dpcm_root) {
2360                 dev_dbg(rtd->dev,
2361                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2362                          rtd->dai_link->name);
2363                 return -EINVAL;
2364         }
2365
2366         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2367                                                 rtd->debugfs_dpcm_root,
2368                                                 rtd, &dpcm_state_fops);
2369
2370         return 0;
2371 }
2372 #endif