sound/soc/soc-pcm.c

   1 /*
   2  * soc-pcm.c  --  ALSA SoC PCM
   3  *
   4  * Copyright 2005 Wolfson Microelectronics PLC.
   5  * Copyright 2005 Openedhand Ltd.
   6  * Copyright (C) 2010 Slimlogic Ltd.
   7  * Copyright (C) 2010 Texas Instruments Inc.
   8  *
   9  * Authors: Liam Girdwood <lrg@ti.com>
  10  *          Mark Brown <broonie@opensource.wolfsonmicro.com>
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/slab.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/export.h>
  26 #include <linux/debugfs.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31 #include <sound/soc-dpcm.h>
  32 #include <sound/initval.h>
  33
  34 #define DPCM_MAX_BE_USERS       8
  35
  36 /**
  37  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
  38  * @substream: the pcm substream
  39  * @hw: the hardware parameters
  40  *
  41  * Sets the substream runtime hardware parameters.
  42  */
  43 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
  44         const struct snd_pcm_hardware *hw)
  45 {
  46         struct snd_pcm_runtime *runtime = substream->runtime;
  47         runtime->hw.info = hw->info;
  48         runtime->hw.formats = hw->formats;
  49         runtime->hw.period_bytes_min = hw->period_bytes_min;
  50         runtime->hw.period_bytes_max = hw->period_bytes_max;
  51         runtime->hw.periods_min = hw->periods_min;
  52         runtime->hw.periods_max = hw->periods_max;
  53         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
  54         runtime->hw.fifo_size = hw->fifo_size;
  55         return 0;
  56 }
  57 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
  58
  59 /* DPCM stream event, send event to FE and all active BEs. */
  60 static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
  61         int event)
  62 {
  63         struct snd_soc_dpcm *dpcm;
  64
  65         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
  66
  67                 struct snd_soc_pcm_runtime *be = dpcm->be;
  68
  69                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
  70                                 be->dai_link->name, event, dir);
  71
  72                 snd_soc_dapm_stream_event(be, dir, event);
  73         }
  74
  75         snd_soc_dapm_stream_event(fe, dir, event);
  76
  77         return 0;
  78 }
  79
  80 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
  81                                         struct snd_soc_dai *soc_dai)
  82 {
  83         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  84         int ret;
  85
  86         if (!soc_dai->driver->symmetric_rates &&
  87             !rtd->dai_link->symmetric_rates)
  88                 return 0;
  89
  90         /* This can happen if multiple streams are starting simultaneously -
  91          * the second can need to get its constraints before the first has
  92          * picked a rate.  Complain and allow the application to carry on.
  93          */
  94         if (!soc_dai->rate) {
  95                 dev_warn(soc_dai->dev,
  96                          "ASoC: Not enforcing symmetric_rates due to race\n");
  97                 return 0;
  98         }
  99
 100         dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n", soc_dai->rate);
 101
 102         ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 103                                            SNDRV_PCM_HW_PARAM_RATE,
 104                                            soc_dai->rate, soc_dai->rate);
 105         if (ret < 0) {
 106                 dev_err(soc_dai->dev,
 107                         "ASoC: Unable to apply rate symmetry constraint: %d\n",
 108                         ret);
 109                 return ret;
 110         }
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * List of sample sizes that might go over the bus for parameter
 117  * application.  There ought to be a wildcard sample size for things
 118  * like the DAC/ADC resolution to use but there isn't right now.
 119  */
 120 static int sample_sizes[] = {
 121         24, 32,
 122 };
 123
 124 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
 125                               struct snd_soc_dai *dai)
 126 {
 127         int ret, i, bits;
 128
 129         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 130                 bits = dai->driver->playback.sig_bits;
 131         else
 132                 bits = dai->driver->capture.sig_bits;
 133
 134         if (!bits)
 135                 return;
 136
 137         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
 138                 if (bits >= sample_sizes[i])
 139                         continue;
 140
 141                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
 142                                                    sample_sizes[i], bits);
 143                 if (ret != 0)
 144                         dev_warn(dai->dev,
 145                                  "ASoC: Failed to set MSB %d/%d: %d\n",
 146                                  bits, sample_sizes[i], ret);
 147         }
 148 }
 149
 150 static void soc_pcm_init_runtime_hw(struct snd_pcm_hardware *hw,
 151         struct snd_soc_pcm_stream *codec_stream,
 152         struct snd_soc_pcm_stream *cpu_stream)
 153 {
 154         hw->rate_min = max(codec_stream->rate_min, cpu_stream->rate_min);
 155         hw->rate_max = max(codec_stream->rate_max, cpu_stream->rate_max);
 156         hw->channels_min = max(codec_stream->channels_min,
 157                 cpu_stream->channels_min);
 158         hw->channels_max = min(codec_stream->channels_max,
 159                 cpu_stream->channels_max);
 160         hw->formats = codec_stream->formats & cpu_stream->formats;
 161         hw->rates = codec_stream->rates & cpu_stream->rates;
 162         if (codec_stream->rates
 163                 & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 164                 hw->rates |= cpu_stream->rates;
 165         if (cpu_stream->rates
 166                 & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 167                 hw->rates |= codec_stream->rates;
 168 }
 169
 170 /*
 171  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 172  * then initialized and any private data can be allocated. This also calls
 173  * startup for the cpu DAI, platform, machine and codec DAI.
 174  */
 175 static int soc_pcm_open(struct snd_pcm_substream *substream)
 176 {
 177         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 178         struct snd_pcm_runtime *runtime = substream->runtime;
 179         struct snd_soc_platform *platform = rtd->platform;
 180         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 181         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 182         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
 183         struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
 184         int ret = 0;
 185
 186         pm_runtime_get_sync(cpu_dai->dev);
 187         pm_runtime_get_sync(codec_dai->dev);
 188         pm_runtime_get_sync(platform->dev);
 189
 190         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 191
 192         /* startup the audio subsystem */
 193         if (cpu_dai->driver->ops->startup) {
 194                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 195                 if (ret < 0) {
 196                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 197                                 " %s: %d\n", cpu_dai->name, ret);
 198                         goto out;
 199                 }
 200         }
 201
 202         if (platform->driver->ops && platform->driver->ops->open) {
 203                 ret = platform->driver->ops->open(substream);
 204                 if (ret < 0) {
 205                         dev_err(platform->dev, "ASoC: can't open platform"
 206                                 " %s: %d\n", platform->name, ret);
 207                         goto platform_err;
 208                 }
 209         }
 210
 211         if (codec_dai->driver->ops->startup) {
 212                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
 213                 if (ret < 0) {
 214                         dev_err(codec_dai->dev, "ASoC: can't open codec"
 215                                 " %s: %d\n", codec_dai->name, ret);
 216                         goto codec_dai_err;
 217                 }
 218         }
 219
 220         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 221                 ret = rtd->dai_link->ops->startup(substream);
 222                 if (ret < 0) {
 223                         pr_err("ASoC: %s startup failed: %d\n",
 224                                rtd->dai_link->name, ret);
 225                         goto machine_err;
 226                 }
 227         }
 228
 229         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 230         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 231                 goto dynamic;
 232
 233         /* Check that the codec and cpu DAIs are compatible */
 234         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 235                 soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->playback,
 236                         &cpu_dai_drv->playback);
 237         } else {
 238                 soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->capture,
 239                         &cpu_dai_drv->capture);
 240         }
 241
 242         ret = -EINVAL;
 243         snd_pcm_limit_hw_rates(runtime);
 244         if (!runtime->hw.rates) {
 245                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 246                         codec_dai->name, cpu_dai->name);
 247                 goto config_err;
 248         }
 249         if (!runtime->hw.formats) {
 250                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 251                         codec_dai->name, cpu_dai->name);
 252                 goto config_err;
 253         }
 254         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 255             runtime->hw.channels_min > runtime->hw.channels_max) {
 256                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 257                                 codec_dai->name, cpu_dai->name);
 258                 goto config_err;
 259         }
 260
 261         soc_pcm_apply_msb(substream, codec_dai);
 262         soc_pcm_apply_msb(substream, cpu_dai);
 263
 264         /* Symmetry only applies if we've already got an active stream. */
 265         if (cpu_dai->active) {
 266                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 267                 if (ret != 0)
 268                         goto config_err;
 269         }
 270
 271         if (codec_dai->active) {
 272                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
 273                 if (ret != 0)
 274                         goto config_err;
 275         }
 276
 277         pr_debug("ASoC: %s <-> %s info:\n",
 278                         codec_dai->name, cpu_dai->name);
 279         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 280         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 281                  runtime->hw.channels_max);
 282         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 283                  runtime->hw.rate_max);
 284
 285 dynamic:
 286         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 287                 cpu_dai->playback_active++;
 288                 codec_dai->playback_active++;
 289         } else {
 290                 cpu_dai->capture_active++;
 291                 codec_dai->capture_active++;
 292         }
 293         cpu_dai->active++;
 294         codec_dai->active++;
 295         rtd->codec->active++;
 296         mutex_unlock(&rtd->pcm_mutex);
 297         return 0;
 298
 299 config_err:
 300         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 301                 rtd->dai_link->ops->shutdown(substream);
 302
 303 machine_err:
 304         if (codec_dai->driver->ops->shutdown)
 305                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 306
 307 codec_dai_err:
 308         if (platform->driver->ops && platform->driver->ops->close)
 309                 platform->driver->ops->close(substream);
 310
 311 platform_err:
 312         if (cpu_dai->driver->ops->shutdown)
 313                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 314 out:
 315         mutex_unlock(&rtd->pcm_mutex);
 316
 317         pm_runtime_put(platform->dev);
 318         pm_runtime_put(codec_dai->dev);
 319         pm_runtime_put(cpu_dai->dev);
 320
 321         return ret;
 322 }
 323
 324 /*
 325  * Power down the audio subsystem pmdown_time msecs after close is called.
 326  * This is to ensure there are no pops or clicks in between any music tracks
 327  * due to DAPM power cycling.
 328  */
 329 static void close_delayed_work(struct work_struct *work)
 330 {
 331         struct snd_soc_pcm_runtime *rtd =
 332                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 333         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 334
 335         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 336
 337         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 338                  codec_dai->driver->playback.stream_name,
 339                  codec_dai->playback_active ? "active" : "inactive",
 340                  rtd->pop_wait ? "yes" : "no");
 341
 342         /* are we waiting on this codec DAI stream */
 343         if (rtd->pop_wait == 1) {
 344                 rtd->pop_wait = 0;
 345                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 346                                           SND_SOC_DAPM_STREAM_STOP);
 347         }
 348
 349         mutex_unlock(&rtd->pcm_mutex);
 350 }
 351
 352 /*
 353  * Called by ALSA when a PCM substream is closed. Private data can be
 354  * freed here. The cpu DAI, codec DAI, machine and platform are also
 355  * shutdown.
 356  */
 357 static int soc_pcm_close(struct snd_pcm_substream *substream)
 358 {
 359         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 360         struct snd_soc_platform *platform = rtd->platform;
 361         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 362         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 363         struct snd_soc_codec *codec = rtd->codec;
 364
 365         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 366
 367         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 368                 cpu_dai->playback_active--;
 369                 codec_dai->playback_active--;
 370         } else {
 371                 cpu_dai->capture_active--;
 372                 codec_dai->capture_active--;
 373         }
 374
 375         cpu_dai->active--;
 376         codec_dai->active--;
 377         codec->active--;
 378
 379         /* clear the corresponding DAIs rate when inactive */
 380         if (!cpu_dai->active)
 381                 cpu_dai->rate = 0;
 382
 383         if (!codec_dai->active)
 384                 codec_dai->rate = 0;
 385
 386         /* Muting the DAC suppresses artifacts caused during digital
 387          * shutdown, for example from stopping clocks.
 388          */
 389         snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
 390
 391         if (cpu_dai->driver->ops->shutdown)
 392                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 393
 394         if (codec_dai->driver->ops->shutdown)
 395                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 396
 397         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 398                 rtd->dai_link->ops->shutdown(substream);
 399
 400         if (platform->driver->ops && platform->driver->ops->close)
 401                 platform->driver->ops->close(substream);
 402         cpu_dai->runtime = NULL;
 403
 404         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 405                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 406                     rtd->dai_link->ignore_pmdown_time) {
 407                         /* powered down playback stream now */
 408                         snd_soc_dapm_stream_event(rtd,
 409                                                   SNDRV_PCM_STREAM_PLAYBACK,
 410                                                   SND_SOC_DAPM_STREAM_STOP);
 411                 } else {
 412                         /* start delayed pop wq here for playback streams */
 413                         rtd->pop_wait = 1;
 414                         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->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->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->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->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->hw_free)
 563                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 564
 565 interface_err:
 566         if (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->hw_free)
 604                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 605
 606         if (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->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->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->bespoke_trigger) {
 651                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
 652                 if (ret < 0)
 653                         return ret;
 654         }
 655
 656         if (platform->driver->bespoke_trigger) {
 657                 ret = platform->driver->bespoke_trigger(substream, cmd);
 658                 if (ret < 0)
 659                         return ret;
 660         }
 661
 662         if (cpu_dai->driver->ops->bespoke_trigger) {
 663                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
 664                 if (ret < 0)
 665                         return ret;
 666         }
 667         return 0;
 668 }
 669 /*
 670  * soc level wrapper for pointer callback
 671  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 672  * the runtime->delay will be updated accordingly.
 673  */
 674 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 675 {
 676         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 677         struct snd_soc_platform *platform = rtd->platform;
 678         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 679         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 680         struct snd_pcm_runtime *runtime = substream->runtime;
 681         snd_pcm_uframes_t offset = 0;
 682         snd_pcm_sframes_t delay = 0;
 683
 684         if (platform->driver->ops && platform->driver->ops->pointer)
 685                 offset = platform->driver->ops->pointer(substream);
 686
 687         if (cpu_dai->driver->ops->delay)
 688                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 689
 690         if (codec_dai->driver->ops->delay)
 691                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 692
 693         if (platform->driver->delay)
 694                 delay += platform->driver->delay(substream, codec_dai);
 695
 696         runtime->delay = delay;
 697
 698         return offset;
 699 }
 700
 701 /* connect a FE and BE */
 702 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
 703                 struct snd_soc_pcm_runtime *be, int stream)
 704 {
 705         struct snd_soc_dpcm *dpcm;
 706
 707         /* only add new dpcms */
 708         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 709                 if (dpcm->be == be && dpcm->fe == fe)
 710                         return 0;
 711         }
 712
 713         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
 714         if (!dpcm)
 715                 return -ENOMEM;
 716
 717         dpcm->be = be;
 718         dpcm->fe = fe;
 719         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
 720         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
 721         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
 722         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
 723
 724         dev_dbg(fe->dev, "  connected new DPCM %s path %s %s %s\n",
 725                         stream ? "capture" : "playback",  fe->dai_link->name,
 726                         stream ? "<-" : "->", be->dai_link->name);
 727
 728 #ifdef CONFIG_DEBUG_FS
 729         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
 730                         fe->debugfs_dpcm_root, &dpcm->state);
 731 #endif
 732         return 1;
 733 }
 734
 735 /* reparent a BE onto another FE */
 736 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
 737                         struct snd_soc_pcm_runtime *be, int stream)
 738 {
 739         struct snd_soc_dpcm *dpcm;
 740         struct snd_pcm_substream *fe_substream, *be_substream;
 741
 742         /* reparent if BE is connected to other FEs */
 743         if (!be->dpcm[stream].users)
 744                 return;
 745
 746         be_substream = snd_soc_dpcm_get_substream(be, stream);
 747
 748         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
 749                 if (dpcm->fe == fe)
 750                         continue;
 751
 752                 dev_dbg(fe->dev, "  reparent %s path %s %s %s\n",
 753                         stream ? "capture" : "playback",
 754                         dpcm->fe->dai_link->name,
 755                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 756
 757                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
 758                 be_substream->runtime = fe_substream->runtime;
 759                 break;
 760         }
 761 }
 762
 763 /* disconnect a BE and FE */
 764 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
 765 {
 766         struct snd_soc_dpcm *dpcm, *d;
 767
 768         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
 769                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
 770                                 stream ? "capture" : "playback",
 771                                 dpcm->be->dai_link->name);
 772
 773                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
 774                         continue;
 775
 776                 dev_dbg(fe->dev, "  freed DSP %s path %s %s %s\n",
 777                         stream ? "capture" : "playback", fe->dai_link->name,
 778                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 779
 780                 /* BEs still alive need new FE */
 781                 dpcm_be_reparent(fe, dpcm->be, stream);
 782
 783 #ifdef CONFIG_DEBUG_FS
 784                 debugfs_remove(dpcm->debugfs_state);
 785 #endif
 786                 list_del(&dpcm->list_be);
 787                 list_del(&dpcm->list_fe);
 788                 kfree(dpcm);
 789         }
 790 }
 791
 792 /* get BE for DAI widget and stream */
 793 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
 794                 struct snd_soc_dapm_widget *widget, int stream)
 795 {
 796         struct snd_soc_pcm_runtime *be;
 797         int i;
 798
 799         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 800                 for (i = 0; i < card->num_links; i++) {
 801                         be = &card->rtd[i];
 802
 803                         if (!be->dai_link->no_pcm)
 804                                 continue;
 805
 806                         if (be->cpu_dai->playback_widget == widget ||
 807                                 be->codec_dai->playback_widget == widget)
 808                                 return be;
 809                 }
 810         } else {
 811
 812                 for (i = 0; i < card->num_links; i++) {
 813                         be = &card->rtd[i];
 814
 815                         if (!be->dai_link->no_pcm)
 816                                 continue;
 817
 818                         if (be->cpu_dai->capture_widget == widget ||
 819                                 be->codec_dai->capture_widget == widget)
 820                                 return be;
 821                 }
 822         }
 823
 824         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
 825                 stream ? "capture" : "playback", widget->name);
 826         return NULL;
 827 }
 828
 829 static inline struct snd_soc_dapm_widget *
 830         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 831 {
 832         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 833                 return rtd->cpu_dai->playback_widget;
 834         else
 835                 return rtd->cpu_dai->capture_widget;
 836 }
 837
 838 static inline struct snd_soc_dapm_widget *
 839         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 840 {
 841         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 842                 return rtd->codec_dai->playback_widget;
 843         else
 844                 return rtd->codec_dai->capture_widget;
 845 }
 846
 847 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 848                 struct snd_soc_dapm_widget *widget)
 849 {
 850         int i;
 851
 852         for (i = 0; i < list->num_widgets; i++) {
 853                 if (widget == list->widgets[i])
 854                         return 1;
 855         }
 856
 857         return 0;
 858 }
 859
 860 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 861         int stream, struct snd_soc_dapm_widget_list **list_)
 862 {
 863         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
 864         struct snd_soc_dapm_widget_list *list;
 865         int paths;
 866
 867         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
 868                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
 869         if (list == NULL)
 870                 return -ENOMEM;
 871
 872         /* get number of valid DAI paths and their widgets */
 873         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
 874
 875         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
 876                         stream ? "capture" : "playback");
 877
 878         *list_ = list;
 879         return paths;
 880 }
 881
 882 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 883 {
 884         kfree(*list);
 885 }
 886
 887 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
 888         struct snd_soc_dapm_widget_list **list_)
 889 {
 890         struct snd_soc_dpcm *dpcm;
 891         struct snd_soc_dapm_widget_list *list = *list_;
 892         struct snd_soc_dapm_widget *widget;
 893         int prune = 0;
 894
 895         /* Destroy any old FE <--> BE connections */
 896         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 897
 898                 /* is there a valid CPU DAI widget for this BE */
 899                 widget = rtd_get_cpu_widget(dpcm->be, stream);
 900
 901                 /* prune the BE if it's no longer in our active list */
 902                 if (widget && widget_in_list(list, widget))
 903                         continue;
 904
 905                 /* is there a valid CODEC DAI widget for this BE */
 906                 widget = rtd_get_codec_widget(dpcm->be, stream);
 907
 908                 /* prune the BE if it's no longer in our active list */
 909                 if (widget && widget_in_list(list, widget))
 910                         continue;
 911
 912                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
 913                         stream ? "capture" : "playback",
 914                         dpcm->be->dai_link->name, fe->dai_link->name);
 915                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 916                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 917                 prune++;
 918         }
 919
 920         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
 921         return prune;
 922 }
 923
 924 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
 925         struct snd_soc_dapm_widget_list **list_)
 926 {
 927         struct snd_soc_card *card = fe->card;
 928         struct snd_soc_dapm_widget_list *list = *list_;
 929         struct snd_soc_pcm_runtime *be;
 930         int i, new = 0, err;
 931
 932         /* Create any new FE <--> BE connections */
 933         for (i = 0; i < list->num_widgets; i++) {
 934
 935                 switch (list->widgets[i]->id) {
 936                 case snd_soc_dapm_dai_in:
 937                 case snd_soc_dapm_dai_out:
 938                         break;
 939                 default:
 940                         continue;
 941                 }
 942
 943                 /* is there a valid BE rtd for this widget */
 944                 be = dpcm_get_be(card, list->widgets[i], stream);
 945                 if (!be) {
 946                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
 947                                         list->widgets[i]->name);
 948                         continue;
 949                 }
 950
 951                 /* make sure BE is a real BE */
 952                 if (!be->dai_link->no_pcm)
 953                         continue;
 954
 955                 /* don't connect if FE is not running */
 956                 if (!fe->dpcm[stream].runtime)
 957                         continue;
 958
 959                 /* newly connected FE and BE */
 960                 err = dpcm_be_connect(fe, be, stream);
 961                 if (err < 0) {
 962                         dev_err(fe->dev, "ASoC: can't connect %s\n",
 963                                 list->widgets[i]->name);
 964                         break;
 965                 } else if (err == 0) /* already connected */
 966                         continue;
 967
 968                 /* new */
 969                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 970                 new++;
 971         }
 972
 973         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
 974         return new;
 975 }
 976
 977 /*
 978  * Find the corresponding BE DAIs that source or sink audio to this
 979  * FE substream.
 980  */
 981 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 982         int stream, struct snd_soc_dapm_widget_list **list, int new)
 983 {
 984         if (new)
 985                 return dpcm_add_paths(fe, stream, list);
 986         else
 987                 return dpcm_prune_paths(fe, stream, list);
 988 }
 989
 990 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
 991 {
 992         struct snd_soc_dpcm *dpcm;
 993
 994         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
 995                 dpcm->be->dpcm[stream].runtime_update =
 996                                                 SND_SOC_DPCM_UPDATE_NO;
 997 }
 998
 999 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1000         int stream)
1001 {
1002         struct snd_soc_dpcm *dpcm;
1003
1004         /* disable any enabled and non active backends */
1005         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1006
1007                 struct snd_soc_pcm_runtime *be = dpcm->be;
1008                 struct snd_pcm_substream *be_substream =
1009                         snd_soc_dpcm_get_substream(be, stream);
1010
1011                 if (be->dpcm[stream].users == 0)
1012                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1013                                 stream ? "capture" : "playback",
1014                                 be->dpcm[stream].state);
1015
1016                 if (--be->dpcm[stream].users != 0)
1017                         continue;
1018
1019                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1020                         continue;
1021
1022                 soc_pcm_close(be_substream);
1023                 be_substream->runtime = NULL;
1024                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1025         }
1026 }
1027
1028 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1029 {
1030         struct snd_soc_dpcm *dpcm;
1031         int err, count = 0;
1032
1033         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1034         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1035
1036                 struct snd_soc_pcm_runtime *be = dpcm->be;
1037                 struct snd_pcm_substream *be_substream =
1038                         snd_soc_dpcm_get_substream(be, stream);
1039
1040                 /* is this op for this BE ? */
1041                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1042                         continue;
1043
1044                 /* first time the dpcm is open ? */
1045                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1046                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1047                                 stream ? "capture" : "playback",
1048                                 be->dpcm[stream].state);
1049
1050                 if (be->dpcm[stream].users++ != 0)
1051                         continue;
1052
1053                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1054                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1055                         continue;
1056
1057                 dev_dbg(be->dev, "ASoC: open BE %s\n", be->dai_link->name);
1058
1059                 be_substream->runtime = be->dpcm[stream].runtime;
1060                 err = soc_pcm_open(be_substream);
1061                 if (err < 0) {
1062                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1063                         be->dpcm[stream].users--;
1064                         if (be->dpcm[stream].users < 0)
1065                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1066                                         stream ? "capture" : "playback",
1067                                         be->dpcm[stream].state);
1068
1069                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1070                         goto unwind;
1071                 }
1072
1073                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1074                 count++;
1075         }
1076
1077         return count;
1078
1079 unwind:
1080         /* disable any enabled and non active backends */
1081         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1082                 struct snd_soc_pcm_runtime *be = dpcm->be;
1083                 struct snd_pcm_substream *be_substream =
1084                         snd_soc_dpcm_get_substream(be, stream);
1085
1086                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1087                         continue;
1088
1089                 if (be->dpcm[stream].users == 0)
1090                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1091                                 stream ? "capture" : "playback",
1092                                 be->dpcm[stream].state);
1093
1094                 if (--be->dpcm[stream].users != 0)
1095                         continue;
1096
1097                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1098                         continue;
1099
1100                 soc_pcm_close(be_substream);
1101                 be_substream->runtime = NULL;
1102                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1103         }
1104
1105         return err;
1106 }
1107
1108 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1109 {
1110         struct snd_pcm_runtime *runtime = substream->runtime;
1111         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1112         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1113         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1114
1115         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1116                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1117                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1118                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1119                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1120                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1121                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1122         } else {
1123                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1124                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1125                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1126                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1127                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1128                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1129         }
1130 }
1131
1132 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1133 {
1134         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1135         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1136         int stream = fe_substream->stream, ret = 0;
1137
1138         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1139
1140         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1141         if (ret < 0) {
1142                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1143                 goto be_err;
1144         }
1145
1146         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1147
1148         /* start the DAI frontend */
1149         ret = soc_pcm_open(fe_substream);
1150         if (ret < 0) {
1151                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1152                 goto unwind;
1153         }
1154
1155         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1156
1157         dpcm_set_fe_runtime(fe_substream);
1158         snd_pcm_limit_hw_rates(runtime);
1159
1160         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1161         return 0;
1162
1163 unwind:
1164         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1165 be_err:
1166         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1167         return ret;
1168 }
1169
1170 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1171 {
1172         struct snd_soc_dpcm *dpcm;
1173
1174         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1175         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1176
1177                 struct snd_soc_pcm_runtime *be = dpcm->be;
1178                 struct snd_pcm_substream *be_substream =
1179                         snd_soc_dpcm_get_substream(be, stream);
1180
1181                 /* is this op for this BE ? */
1182                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1183                         continue;
1184
1185                 if (be->dpcm[stream].users == 0)
1186                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1187                                 stream ? "capture" : "playback",
1188                                 be->dpcm[stream].state);
1189
1190                 if (--be->dpcm[stream].users != 0)
1191                         continue;
1192
1193                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1194                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1195                         continue;
1196
1197                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1198                         dpcm->fe->dai_link->name);
1199
1200                 soc_pcm_close(be_substream);
1201                 be_substream->runtime = NULL;
1202
1203                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1204         }
1205         return 0;
1206 }
1207
1208 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1209 {
1210         struct snd_soc_pcm_runtime *fe = substream->private_data;
1211         int stream = substream->stream;
1212
1213         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1214
1215         /* shutdown the BEs */
1216         dpcm_be_dai_shutdown(fe, substream->stream);
1217
1218         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1219
1220         /* now shutdown the frontend */
1221         soc_pcm_close(substream);
1222
1223         /* run the stream event for each BE */
1224         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1225
1226         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1227         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1228         return 0;
1229 }
1230
1231 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1232 {
1233         struct snd_soc_dpcm *dpcm;
1234
1235         /* only hw_params backends that are either sinks or sources
1236          * to this frontend DAI */
1237         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1238
1239                 struct snd_soc_pcm_runtime *be = dpcm->be;
1240                 struct snd_pcm_substream *be_substream =
1241                         snd_soc_dpcm_get_substream(be, stream);
1242
1243                 /* is this op for this BE ? */
1244                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1245                         continue;
1246
1247                 /* only free hw when no longer used - check all FEs */
1248                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1249                                 continue;
1250
1251                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1252                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1253                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1254                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1255                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1256                         continue;
1257
1258                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1259                         dpcm->fe->dai_link->name);
1260
1261                 soc_pcm_hw_free(be_substream);
1262
1263                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1264         }
1265
1266         return 0;
1267 }
1268
1269 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1270 {
1271         struct snd_soc_pcm_runtime *fe = substream->private_data;
1272         int err, stream = substream->stream;
1273
1274         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1275         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1276
1277         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1278
1279         /* call hw_free on the frontend */
1280         err = soc_pcm_hw_free(substream);
1281         if (err < 0)
1282                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1283                         fe->dai_link->name);
1284
1285         /* only hw_params backends that are either sinks or sources
1286          * to this frontend DAI */
1287         err = dpcm_be_dai_hw_free(fe, stream);
1288
1289         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1290         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1291
1292         mutex_unlock(&fe->card->mutex);
1293         return 0;
1294 }
1295
1296 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1297 {
1298         struct snd_soc_dpcm *dpcm;
1299         int ret;
1300
1301         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1302
1303                 struct snd_soc_pcm_runtime *be = dpcm->be;
1304                 struct snd_pcm_substream *be_substream =
1305                         snd_soc_dpcm_get_substream(be, stream);
1306
1307                 /* is this op for this BE ? */
1308                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1309                         continue;
1310
1311                 /* only allow hw_params() if no connected FEs are running */
1312                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1313                         continue;
1314
1315                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1316                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1317                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1318                         continue;
1319
1320                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1321                         dpcm->fe->dai_link->name);
1322
1323                 /* copy params for each dpcm */
1324                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1325                                 sizeof(struct snd_pcm_hw_params));
1326
1327                 /* perform any hw_params fixups */
1328                 if (be->dai_link->be_hw_params_fixup) {
1329                         ret = be->dai_link->be_hw_params_fixup(be,
1330                                         &dpcm->hw_params);
1331                         if (ret < 0) {
1332                                 dev_err(be->dev,
1333                                         "ASoC: hw_params BE fixup failed %d\n",
1334                                         ret);
1335                                 goto unwind;
1336                         }
1337                 }
1338
1339                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1340                 if (ret < 0) {
1341                         dev_err(dpcm->be->dev,
1342                                 "ASoC: hw_params BE failed %d\n", ret);
1343                         goto unwind;
1344                 }
1345
1346                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1347         }
1348         return 0;
1349
1350 unwind:
1351         /* disable any enabled and non active backends */
1352         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1353                 struct snd_soc_pcm_runtime *be = dpcm->be;
1354                 struct snd_pcm_substream *be_substream =
1355                         snd_soc_dpcm_get_substream(be, stream);
1356
1357                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1358                         continue;
1359
1360                 /* only allow hw_free() if no connected FEs are running */
1361                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1362                         continue;
1363
1364                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1365                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1366                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1367                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1368                         continue;
1369
1370                 soc_pcm_hw_free(be_substream);
1371         }
1372
1373         return ret;
1374 }
1375
1376 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1377                                  struct snd_pcm_hw_params *params)
1378 {
1379         struct snd_soc_pcm_runtime *fe = substream->private_data;
1380         int ret, stream = substream->stream;
1381
1382         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1383         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1384
1385         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1386                         sizeof(struct snd_pcm_hw_params));
1387         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1388         if (ret < 0) {
1389                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1390                 goto out;
1391         }
1392
1393         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1394                         fe->dai_link->name, params_rate(params),
1395                         params_channels(params), params_format(params));
1396
1397         /* call hw_params on the frontend */
1398         ret = soc_pcm_hw_params(substream, params);
1399         if (ret < 0) {
1400                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1401                 dpcm_be_dai_hw_free(fe, stream);
1402          } else
1403                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1404
1405 out:
1406         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1407         mutex_unlock(&fe->card->mutex);
1408         return ret;
1409 }
1410
1411 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1412                 struct snd_pcm_substream *substream, int cmd)
1413 {
1414         int ret;
1415
1416         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1417                         dpcm->fe->dai_link->name, cmd);
1418
1419         ret = soc_pcm_trigger(substream, cmd);
1420         if (ret < 0)
1421                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1422
1423         return ret;
1424 }
1425
1426 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1427                                int cmd)
1428 {
1429         struct snd_soc_dpcm *dpcm;
1430         int ret = 0;
1431
1432         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1433
1434                 struct snd_soc_pcm_runtime *be = dpcm->be;
1435                 struct snd_pcm_substream *be_substream =
1436                         snd_soc_dpcm_get_substream(be, stream);
1437
1438                 /* is this op for this BE ? */
1439                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1440                         continue;
1441
1442                 switch (cmd) {
1443                 case SNDRV_PCM_TRIGGER_START:
1444                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1445                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1446                                 continue;
1447
1448                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1449                         if (ret)
1450                                 return ret;
1451
1452                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1453                         break;
1454                 case SNDRV_PCM_TRIGGER_RESUME:
1455                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1456                                 continue;
1457
1458                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1459                         if (ret)
1460                                 return ret;
1461
1462                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1463                         break;
1464                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1465                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1466                                 continue;
1467
1468                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1469                         if (ret)
1470                                 return ret;
1471
1472                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1473                         break;
1474                 case SNDRV_PCM_TRIGGER_STOP:
1475                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1476                                 continue;
1477
1478                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1479                                 continue;
1480
1481                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1482                         if (ret)
1483                                 return ret;
1484
1485                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1486                         break;
1487                 case SNDRV_PCM_TRIGGER_SUSPEND:
1488                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1489                                 continue;
1490
1491                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1492                                 continue;
1493
1494                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1495                         if (ret)
1496                                 return ret;
1497
1498                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1499                         break;
1500                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1501                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1502                                 continue;
1503
1504                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1505                                 continue;
1506
1507                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1508                         if (ret)
1509                                 return ret;
1510
1511                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1512                         break;
1513                 }
1514         }
1515
1516         return ret;
1517 }
1518 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1519
1520 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1521 {
1522         struct snd_soc_pcm_runtime *fe = substream->private_data;
1523         int stream = substream->stream, ret;
1524         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1525
1526         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1527
1528         switch (trigger) {
1529         case SND_SOC_DPCM_TRIGGER_PRE:
1530                 /* call trigger on the frontend before the backend. */
1531
1532                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1533                                 fe->dai_link->name, cmd);
1534
1535                 ret = soc_pcm_trigger(substream, cmd);
1536                 if (ret < 0) {
1537                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1538                         goto out;
1539                 }
1540
1541                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1542                 break;
1543         case SND_SOC_DPCM_TRIGGER_POST:
1544                 /* call trigger on the frontend after the backend. */
1545
1546                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1547                 if (ret < 0) {
1548                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1549                         goto out;
1550                 }
1551
1552                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1553                                 fe->dai_link->name, cmd);
1554
1555                 ret = soc_pcm_trigger(substream, cmd);
1556                 break;
1557         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1558                 /* bespoke trigger() - handles both FE and BEs */
1559
1560                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1561                                 fe->dai_link->name, cmd);
1562
1563                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1564                 if (ret < 0) {
1565                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1566                         goto out;
1567                 }
1568                 break;
1569         default:
1570                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1571                                 fe->dai_link->name);
1572                 ret = -EINVAL;
1573                 goto out;
1574         }
1575
1576         switch (cmd) {
1577         case SNDRV_PCM_TRIGGER_START:
1578         case SNDRV_PCM_TRIGGER_RESUME:
1579         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1580                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1581                 break;
1582         case SNDRV_PCM_TRIGGER_STOP:
1583         case SNDRV_PCM_TRIGGER_SUSPEND:
1584         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1585                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1586                 break;
1587         }
1588
1589 out:
1590         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1591         return ret;
1592 }
1593
1594 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1595 {
1596         struct snd_soc_dpcm *dpcm;
1597         int ret = 0;
1598
1599         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1600
1601                 struct snd_soc_pcm_runtime *be = dpcm->be;
1602                 struct snd_pcm_substream *be_substream =
1603                         snd_soc_dpcm_get_substream(be, stream);
1604
1605                 /* is this op for this BE ? */
1606                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1607                         continue;
1608
1609                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1610                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1611                         continue;
1612
1613                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
1614                         dpcm->fe->dai_link->name);
1615
1616                 ret = soc_pcm_prepare(be_substream);
1617                 if (ret < 0) {
1618                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
1619                                 ret);
1620                         break;
1621                 }
1622
1623                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1624         }
1625         return ret;
1626 }
1627
1628 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1629 {
1630         struct snd_soc_pcm_runtime *fe = substream->private_data;
1631         int stream = substream->stream, ret = 0;
1632
1633         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1634
1635         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
1636
1637         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1638
1639         /* there is no point preparing this FE if there are no BEs */
1640         if (list_empty(&fe->dpcm[stream].be_clients)) {
1641                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
1642                                 fe->dai_link->name);
1643                 ret = -EINVAL;
1644                 goto out;
1645         }
1646
1647         ret = dpcm_be_dai_prepare(fe, substream->stream);
1648         if (ret < 0)
1649                 goto out;
1650
1651         /* call prepare on the frontend */
1652         ret = soc_pcm_prepare(substream);
1653         if (ret < 0) {
1654                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
1655                         fe->dai_link->name);
1656                 goto out;
1657         }
1658
1659         /* run the stream event for each BE */
1660         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1661         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1662
1663 out:
1664         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1665         mutex_unlock(&fe->card->mutex);
1666
1667         return ret;
1668 }
1669
1670 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1671                      unsigned int cmd, void *arg)
1672 {
1673         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1674         struct snd_soc_platform *platform = rtd->platform;
1675
1676         if (platform->driver->ops->ioctl)
1677                 return platform->driver->ops->ioctl(substream, cmd, arg);
1678         return snd_pcm_lib_ioctl(substream, cmd, arg);
1679 }
1680
1681 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1682 {
1683         struct snd_pcm_substream *substream =
1684                 snd_soc_dpcm_get_substream(fe, stream);
1685         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1686         int err;
1687
1688         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
1689                         stream ? "capture" : "playback", fe->dai_link->name);
1690
1691         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1692                 /* call bespoke trigger - FE takes care of all BE triggers */
1693                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
1694                                 fe->dai_link->name);
1695
1696                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1697                 if (err < 0)
1698                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1699         } else {
1700                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
1701                         fe->dai_link->name);
1702
1703                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1704                 if (err < 0)
1705                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1706         }
1707
1708         err = dpcm_be_dai_hw_free(fe, stream);
1709         if (err < 0)
1710                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
1711
1712         err = dpcm_be_dai_shutdown(fe, stream);
1713         if (err < 0)
1714                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
1715
1716         /* run the stream event for each BE */
1717         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1718
1719         return 0;
1720 }
1721
1722 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1723 {
1724         struct snd_pcm_substream *substream =
1725                 snd_soc_dpcm_get_substream(fe, stream);
1726         struct snd_soc_dpcm *dpcm;
1727         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1728         int ret;
1729
1730         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
1731                         stream ? "capture" : "playback", fe->dai_link->name);
1732
1733         /* Only start the BE if the FE is ready */
1734         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1735                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1736                 return -EINVAL;
1737
1738         /* startup must always be called for new BEs */
1739         ret = dpcm_be_dai_startup(fe, stream);
1740         if (ret < 0)
1741                 goto disconnect;
1742
1743         /* keep going if FE state is > open */
1744         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1745                 return 0;
1746
1747         ret = dpcm_be_dai_hw_params(fe, stream);
1748         if (ret < 0)
1749                 goto close;
1750
1751         /* keep going if FE state is > hw_params */
1752         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1753                 return 0;
1754
1755
1756         ret = dpcm_be_dai_prepare(fe, stream);
1757         if (ret < 0)
1758                 goto hw_free;
1759
1760         /* run the stream event for each BE */
1761         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1762
1763         /* keep going if FE state is > prepare */
1764         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1765                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1766                 return 0;
1767
1768         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1769                 /* call trigger on the frontend - FE takes care of all BE triggers */
1770                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
1771                                 fe->dai_link->name);
1772
1773                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1774                 if (ret < 0) {
1775                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
1776                         goto hw_free;
1777                 }
1778         } else {
1779                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
1780                         fe->dai_link->name);
1781
1782                 ret = dpcm_be_dai_trigger(fe, stream,
1783                                         SNDRV_PCM_TRIGGER_START);
1784                 if (ret < 0) {
1785                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1786                         goto hw_free;
1787                 }
1788         }
1789
1790         return 0;
1791
1792 hw_free:
1793         dpcm_be_dai_hw_free(fe, stream);
1794 close:
1795         dpcm_be_dai_shutdown(fe, stream);
1796 disconnect:
1797         /* disconnect any non started BEs */
1798         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1799                 struct snd_soc_pcm_runtime *be = dpcm->be;
1800                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1801                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1802         }
1803
1804         return ret;
1805 }
1806
1807 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1808 {
1809         int ret;
1810
1811         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1812         ret = dpcm_run_update_startup(fe, stream);
1813         if (ret < 0)
1814                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
1815         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1816
1817         return ret;
1818 }
1819
1820 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1821 {
1822         int ret;
1823
1824         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1825         ret = dpcm_run_update_shutdown(fe, stream);
1826         if (ret < 0)
1827                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
1828         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1829
1830         return ret;
1831 }
1832
1833 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1834  * any DAI links.
1835  */
1836 int soc_dpcm_runtime_update(struct snd_soc_card *card)
1837 {
1838         int i, old, new, paths;
1839
1840         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1841         for (i = 0; i < card->num_rtd; i++) {
1842                 struct snd_soc_dapm_widget_list *list;
1843                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1844
1845                 /* make sure link is FE */
1846                 if (!fe->dai_link->dynamic)
1847                         continue;
1848
1849                 /* only check active links */
1850                 if (!fe->cpu_dai->active)
1851                         continue;
1852
1853                 /* DAPM sync will call this to update DSP paths */
1854                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
1855                         fe->dai_link->name);
1856
1857                 /* skip if FE doesn't have playback capability */
1858                 if (!fe->cpu_dai->driver->playback.channels_min)
1859                         goto capture;
1860
1861                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1862                 if (paths < 0) {
1863                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1864                                         fe->dai_link->name,  "playback");
1865                         mutex_unlock(&card->mutex);
1866                         return paths;
1867                 }
1868
1869                 /* update any new playback paths */
1870                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1871                 if (new) {
1872                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1873                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1874                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1875                 }
1876
1877                 /* update any old playback paths */
1878                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1879                 if (old) {
1880                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1881                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1882                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1883                 }
1884
1885 capture:
1886                 /* skip if FE doesn't have capture capability */
1887                 if (!fe->cpu_dai->driver->capture.channels_min)
1888                         continue;
1889
1890                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1891                 if (paths < 0) {
1892                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1893                                         fe->dai_link->name,  "capture");
1894                         mutex_unlock(&card->mutex);
1895                         return paths;
1896                 }
1897
1898                 /* update any new capture paths */
1899                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1900                 if (new) {
1901                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1902                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1903                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1904                 }
1905
1906                 /* update any old capture paths */
1907                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1908                 if (old) {
1909                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1910                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1911                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1912                 }
1913
1914                 dpcm_path_put(&list);
1915         }
1916
1917         mutex_unlock(&card->mutex);
1918         return 0;
1919 }
1920 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1921 {
1922         struct snd_soc_dpcm *dpcm;
1923         struct list_head *clients =
1924                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1925
1926         list_for_each_entry(dpcm, clients, list_be) {
1927
1928                 struct snd_soc_pcm_runtime *be = dpcm->be;
1929                 struct snd_soc_dai *dai = be->codec_dai;
1930                 struct snd_soc_dai_driver *drv = dai->driver;
1931
1932                 if (be->dai_link->ignore_suspend)
1933                         continue;
1934
1935                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
1936
1937                 if (drv->ops->digital_mute && dai->playback_active)
1938                                 drv->ops->digital_mute(dai, mute);
1939         }
1940
1941         return 0;
1942 }
1943
1944 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1945 {
1946         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1947         struct snd_soc_dpcm *dpcm;
1948         struct snd_soc_dapm_widget_list *list;
1949         int ret;
1950         int stream = fe_substream->stream;
1951
1952         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1953         fe->dpcm[stream].runtime = fe_substream->runtime;
1954
1955         if (dpcm_path_get(fe, stream, &list) <= 0) {
1956                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
1957                         fe->dai_link->name, stream ? "capture" : "playback");
1958         }
1959
1960         /* calculate valid and active FE <-> BE dpcms */
1961         dpcm_process_paths(fe, stream, &list, 1);
1962
1963         ret = dpcm_fe_dai_startup(fe_substream);
1964         if (ret < 0) {
1965                 /* clean up all links */
1966                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1967                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1968
1969                 dpcm_be_disconnect(fe, stream);
1970                 fe->dpcm[stream].runtime = NULL;
1971         }
1972
1973         dpcm_clear_pending_state(fe, stream);
1974         dpcm_path_put(&list);
1975         mutex_unlock(&fe->card->mutex);
1976         return ret;
1977 }
1978
1979 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1980 {
1981         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1982         struct snd_soc_dpcm *dpcm;
1983         int stream = fe_substream->stream, ret;
1984
1985         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1986         ret = dpcm_fe_dai_shutdown(fe_substream);
1987
1988         /* mark FE's links ready to prune */
1989         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1990                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1991
1992         dpcm_be_disconnect(fe, stream);
1993
1994         fe->dpcm[stream].runtime = NULL;
1995         mutex_unlock(&fe->card->mutex);
1996         return ret;
1997 }
1998
1999 /* create a new pcm */
2000 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2001 {
2002         struct snd_soc_platform *platform = rtd->platform;
2003         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2004         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2005         struct snd_pcm *pcm;
2006         char new_name[64];
2007         int ret = 0, playback = 0, capture = 0;
2008
2009         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2010                 if (cpu_dai->driver->playback.channels_min)
2011                         playback = 1;
2012                 if (cpu_dai->driver->capture.channels_min)
2013                         capture = 1;
2014         } else {
2015                 if (codec_dai->driver->playback.channels_min &&
2016                     cpu_dai->driver->playback.channels_min)
2017                         playback = 1;
2018                 if (codec_dai->driver->capture.channels_min &&
2019                     cpu_dai->driver->capture.channels_min)
2020                         capture = 1;
2021         }
2022
2023         if (rtd->dai_link->playback_only) {
2024                 playback = 1;
2025                 capture = 0;
2026         }
2027
2028         if (rtd->dai_link->capture_only) {
2029                 playback = 0;
2030                 capture = 1;
2031         }
2032
2033         /* create the PCM */
2034         if (rtd->dai_link->no_pcm) {
2035                 snprintf(new_name, sizeof(new_name), "(%s)",
2036                         rtd->dai_link->stream_name);
2037
2038                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2039                                 playback, capture, &pcm);
2040         } else {
2041                 if (rtd->dai_link->dynamic)
2042                         snprintf(new_name, sizeof(new_name), "%s (*)",
2043                                 rtd->dai_link->stream_name);
2044                 else
2045                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2046                                 rtd->dai_link->stream_name, codec_dai->name, num);
2047
2048                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2049                         capture, &pcm);
2050         }
2051         if (ret < 0) {
2052                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2053                         rtd->dai_link->name);
2054                 return ret;
2055         }
2056         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2057
2058         /* DAPM dai link stream work */
2059         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2060
2061         rtd->pcm = pcm;
2062         pcm->private_data = rtd;
2063
2064         if (rtd->dai_link->no_pcm) {
2065                 if (playback)
2066                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2067                 if (capture)
2068                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2069                 goto out;
2070         }
2071
2072         /* ASoC PCM operations */
2073         if (rtd->dai_link->dynamic) {
2074                 rtd->ops.open           = dpcm_fe_dai_open;
2075                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2076                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2077                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2078                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2079                 rtd->ops.close          = dpcm_fe_dai_close;
2080                 rtd->ops.pointer        = soc_pcm_pointer;
2081                 rtd->ops.ioctl          = soc_pcm_ioctl;
2082         } else {
2083                 rtd->ops.open           = soc_pcm_open;
2084                 rtd->ops.hw_params      = soc_pcm_hw_params;
2085                 rtd->ops.prepare        = soc_pcm_prepare;
2086                 rtd->ops.trigger        = soc_pcm_trigger;
2087                 rtd->ops.hw_free        = soc_pcm_hw_free;
2088                 rtd->ops.close          = soc_pcm_close;
2089                 rtd->ops.pointer        = soc_pcm_pointer;
2090                 rtd->ops.ioctl          = soc_pcm_ioctl;
2091         }
2092
2093         if (platform->driver->ops) {
2094                 rtd->ops.ack            = platform->driver->ops->ack;
2095                 rtd->ops.copy           = platform->driver->ops->copy;
2096                 rtd->ops.silence        = platform->driver->ops->silence;
2097                 rtd->ops.page           = platform->driver->ops->page;
2098                 rtd->ops.mmap           = platform->driver->ops->mmap;
2099         }
2100
2101         if (playback)
2102                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2103
2104         if (capture)
2105                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2106
2107         if (platform->driver->pcm_new) {
2108                 ret = platform->driver->pcm_new(rtd);
2109                 if (ret < 0) {
2110                         dev_err(platform->dev,
2111                                 "ASoC: pcm constructor failed: %d\n",
2112                                 ret);
2113                         return ret;
2114                 }
2115         }
2116
2117         pcm->private_free = platform->driver->pcm_free;
2118 out:
2119         dev_info(rtd->card->dev, " %s <-> %s mapping ok\n", codec_dai->name,
2120                 cpu_dai->name);
2121         return ret;
2122 }
2123
2124 /* is the current PCM operation for this FE ? */
2125 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2126 {
2127         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2128                 return 1;
2129         return 0;
2130 }
2131 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2132
2133 /* is the current PCM operation for this BE ? */
2134 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2135                 struct snd_soc_pcm_runtime *be, int stream)
2136 {
2137         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2138            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2139                   be->dpcm[stream].runtime_update))
2140                 return 1;
2141         return 0;
2142 }
2143 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2144
2145 /* get the substream for this BE */
2146 struct snd_pcm_substream *
2147         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2148 {
2149         return be->pcm->streams[stream].substream;
2150 }
2151 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2152
2153 /* get the BE runtime state */
2154 enum snd_soc_dpcm_state
2155         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2156 {
2157         return be->dpcm[stream].state;
2158 }
2159 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2160
2161 /* set the BE runtime state */
2162 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2163                 int stream, enum snd_soc_dpcm_state state)
2164 {
2165         be->dpcm[stream].state = state;
2166 }
2167 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2168
2169 /*
2170  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2171  * are not running, paused or suspended for the specified stream direction.
2172  */
2173 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2174                 struct snd_soc_pcm_runtime *be, int stream)
2175 {
2176         struct snd_soc_dpcm *dpcm;
2177         int state;
2178
2179         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2180
2181                 if (dpcm->fe == fe)
2182                         continue;
2183
2184                 state = dpcm->fe->dpcm[stream].state;
2185                 if (state == SND_SOC_DPCM_STATE_START ||
2186                         state == SND_SOC_DPCM_STATE_PAUSED ||
2187                         state == SND_SOC_DPCM_STATE_SUSPEND)
2188                         return 0;
2189         }
2190
2191         /* it's safe to free/stop this BE DAI */
2192         return 1;
2193 }
2194 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2195
2196 /*
2197  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2198  * running, paused or suspended for the specified stream direction.
2199  */
2200 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2201                 struct snd_soc_pcm_runtime *be, int stream)
2202 {
2203         struct snd_soc_dpcm *dpcm;
2204         int state;
2205
2206         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2207
2208                 if (dpcm->fe == fe)
2209                         continue;
2210
2211                 state = dpcm->fe->dpcm[stream].state;
2212                 if (state == SND_SOC_DPCM_STATE_START ||
2213                         state == SND_SOC_DPCM_STATE_PAUSED ||
2214                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2215                         state == SND_SOC_DPCM_STATE_PREPARE)
2216                         return 0;
2217         }
2218
2219         /* it's safe to change hw_params */
2220         return 1;
2221 }
2222 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2223
2224 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2225                 int cmd, struct snd_soc_platform *platform)
2226 {
2227         if (platform->driver->ops->trigger)
2228                 return platform->driver->ops->trigger(substream, cmd);
2229         return 0;
2230 }
2231 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2232
2233 #ifdef CONFIG_DEBUG_FS
2234 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2235 {
2236         switch (state) {
2237         case SND_SOC_DPCM_STATE_NEW:
2238                 return "new";
2239         case SND_SOC_DPCM_STATE_OPEN:
2240                 return "open";
2241         case SND_SOC_DPCM_STATE_HW_PARAMS:
2242                 return "hw_params";
2243         case SND_SOC_DPCM_STATE_PREPARE:
2244                 return "prepare";
2245         case SND_SOC_DPCM_STATE_START:
2246                 return "start";
2247         case SND_SOC_DPCM_STATE_STOP:
2248                 return "stop";
2249         case SND_SOC_DPCM_STATE_SUSPEND:
2250                 return "suspend";
2251         case SND_SOC_DPCM_STATE_PAUSED:
2252                 return "paused";
2253         case SND_SOC_DPCM_STATE_HW_FREE:
2254                 return "hw_free";
2255         case SND_SOC_DPCM_STATE_CLOSE:
2256                 return "close";
2257         }
2258
2259         return "unknown";
2260 }
2261
2262 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2263                                 int stream, char *buf, size_t size)
2264 {
2265         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2266         struct snd_soc_dpcm *dpcm;
2267         ssize_t offset = 0;
2268
2269         /* FE state */
2270         offset += snprintf(buf + offset, size - offset,
2271                         "[%s - %s]\n", fe->dai_link->name,
2272                         stream ? "Capture" : "Playback");
2273
2274         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2275                         dpcm_state_string(fe->dpcm[stream].state));
2276
2277         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2278             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2279                 offset += snprintf(buf + offset, size - offset,
2280                                 "Hardware Params: "
2281                                 "Format = %s, Channels = %d, Rate = %d\n",
2282                                 snd_pcm_format_name(params_format(params)),
2283                                 params_channels(params),
2284                                 params_rate(params));
2285
2286         /* BEs state */
2287         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2288
2289         if (list_empty(&fe->dpcm[stream].be_clients)) {
2290                 offset += snprintf(buf + offset, size - offset,
2291                                 " No active DSP links\n");
2292                 goto out;
2293         }
2294
2295         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2296                 struct snd_soc_pcm_runtime *be = dpcm->be;
2297                 params = &dpcm->hw_params;
2298
2299                 offset += snprintf(buf + offset, size - offset,
2300                                 "- %s\n", be->dai_link->name);
2301
2302                 offset += snprintf(buf + offset, size - offset,
2303                                 "   State: %s\n",
2304                                 dpcm_state_string(be->dpcm[stream].state));
2305
2306                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2307                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2308                         offset += snprintf(buf + offset, size - offset,
2309                                 "   Hardware Params: "
2310                                 "Format = %s, Channels = %d, Rate = %d\n",
2311                                 snd_pcm_format_name(params_format(params)),
2312                                 params_channels(params),
2313                                 params_rate(params));
2314         }
2315
2316 out:
2317         return offset;
2318 }
2319
2320 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2321                                 size_t count, loff_t *ppos)
2322 {
2323         struct snd_soc_pcm_runtime *fe = file->private_data;
2324         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2325         char *buf;
2326
2327         buf = kmalloc(out_count, GFP_KERNEL);
2328         if (!buf)
2329                 return -ENOMEM;
2330
2331         if (fe->cpu_dai->driver->playback.channels_min)
2332                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2333                                         buf + offset, out_count - offset);
2334
2335         if (fe->cpu_dai->driver->capture.channels_min)
2336                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2337                                         buf + offset, out_count - offset);
2338
2339         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2340
2341         kfree(buf);
2342         return ret;
2343 }
2344
2345 static const struct file_operations dpcm_state_fops = {
2346         .open = simple_open,
2347         .read = dpcm_state_read_file,
2348         .llseek = default_llseek,
2349 };
2350
2351 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2352 {
2353         if (!rtd->dai_link)
2354                 return 0;
2355
2356         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2357                         rtd->card->debugfs_card_root);
2358         if (!rtd->debugfs_dpcm_root) {
2359                 dev_dbg(rtd->dev,
2360                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2361                          rtd->dai_link->name);
2362                 return -EINVAL;
2363         }
2364
2365         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2366                                                 rtd->debugfs_dpcm_root,
2367                                                 rtd, &dpcm_state_fops);
2368
2369         return 0;
2370 }
2371 #endif