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/pinctrl/consumer.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/slab.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/export.h>
  27 #include <linux/debugfs.h>
  28 #include <sound/core.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/soc.h>
  32 #include <sound/soc-dpcm.h>
  33 #include <sound/initval.h>
  34
  35 #define DPCM_MAX_BE_USERS       8
  36
  37 /**
  38  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
  39  * @substream: the pcm substream
  40  * @hw: the hardware parameters
  41  *
  42  * Sets the substream runtime hardware parameters.
  43  */
  44 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
  45         const struct snd_pcm_hardware *hw)
  46 {
  47         struct snd_pcm_runtime *runtime = substream->runtime;
  48         runtime->hw.info = hw->info;
  49         runtime->hw.formats = hw->formats;
  50         runtime->hw.period_bytes_min = hw->period_bytes_min;
  51         runtime->hw.period_bytes_max = hw->period_bytes_max;
  52         runtime->hw.periods_min = hw->periods_min;
  53         runtime->hw.periods_max = hw->periods_max;
  54         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
  55         runtime->hw.fifo_size = hw->fifo_size;
  56         return 0;
  57 }
  58 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
  59
  60 /* DPCM stream event, send event to FE and all active BEs. */
  61 static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
  62         int event)
  63 {
  64         struct snd_soc_dpcm *dpcm;
  65
  66         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
  67
  68                 struct snd_soc_pcm_runtime *be = dpcm->be;
  69
  70                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
  71                                 be->dai_link->name, event, dir);
  72
  73                 snd_soc_dapm_stream_event(be, dir, event);
  74         }
  75
  76         snd_soc_dapm_stream_event(fe, dir, event);
  77
  78         return 0;
  79 }
  80
  81 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
  82                                         struct snd_soc_dai *soc_dai)
  83 {
  84         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  85         int ret;
  86
  87         if (!soc_dai->driver->symmetric_rates &&
  88             !rtd->dai_link->symmetric_rates)
  89                 return 0;
  90
  91         /* This can happen if multiple streams are starting simultaneously -
  92          * the second can need to get its constraints before the first has
  93          * picked a rate.  Complain and allow the application to carry on.
  94          */
  95         if (!soc_dai->rate) {
  96                 dev_warn(soc_dai->dev,
  97                          "ASoC: Not enforcing symmetric_rates due to race\n");
  98                 return 0;
  99         }
 100
 101         dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n", soc_dai->rate);
 102
 103         ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 104                                            SNDRV_PCM_HW_PARAM_RATE,
 105                                            soc_dai->rate, soc_dai->rate);
 106         if (ret < 0) {
 107                 dev_err(soc_dai->dev,
 108                         "ASoC: Unable to apply rate symmetry constraint: %d\n",
 109                         ret);
 110                 return ret;
 111         }
 112
 113         return 0;
 114 }
 115
 116 /*
 117  * List of sample sizes that might go over the bus for parameter
 118  * application.  There ought to be a wildcard sample size for things
 119  * like the DAC/ADC resolution to use but there isn't right now.
 120  */
 121 static int sample_sizes[] = {
 122         24, 32,
 123 };
 124
 125 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
 126                               struct snd_soc_dai *dai)
 127 {
 128         int ret, i, bits;
 129
 130         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 131                 bits = dai->driver->playback.sig_bits;
 132         else
 133                 bits = dai->driver->capture.sig_bits;
 134
 135         if (!bits)
 136                 return;
 137
 138         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
 139                 if (bits >= sample_sizes[i])
 140                         continue;
 141
 142                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
 143                                                    sample_sizes[i], bits);
 144                 if (ret != 0)
 145                         dev_warn(dai->dev,
 146                                  "ASoC: Failed to set MSB %d/%d: %d\n",
 147                                  bits, sample_sizes[i], ret);
 148         }
 149 }
 150
 151 static void soc_pcm_init_runtime_hw(struct snd_pcm_hardware *hw,
 152         struct snd_soc_pcm_stream *codec_stream,
 153         struct snd_soc_pcm_stream *cpu_stream)
 154 {
 155         hw->rate_min = max(codec_stream->rate_min, cpu_stream->rate_min);
 156         hw->rate_max = max(codec_stream->rate_max, cpu_stream->rate_max);
 157         hw->channels_min = max(codec_stream->channels_min,
 158                 cpu_stream->channels_min);
 159         hw->channels_max = min(codec_stream->channels_max,
 160                 cpu_stream->channels_max);
 161         hw->formats = codec_stream->formats & cpu_stream->formats;
 162         hw->rates = codec_stream->rates & cpu_stream->rates;
 163         if (codec_stream->rates
 164                 & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 165                 hw->rates |= cpu_stream->rates;
 166         if (cpu_stream->rates
 167                 & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 168                 hw->rates |= codec_stream->rates;
 169 }
 170
 171 /*
 172  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 173  * then initialized and any private data can be allocated. This also calls
 174  * startup for the cpu DAI, platform, machine and codec DAI.
 175  */
 176 static int soc_pcm_open(struct snd_pcm_substream *substream)
 177 {
 178         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 179         struct snd_pcm_runtime *runtime = substream->runtime;
 180         struct snd_soc_platform *platform = rtd->platform;
 181         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 182         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 183         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
 184         struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
 185         int ret = 0;
 186
 187         pinctrl_pm_select_default_state(cpu_dai->dev);
 188         pinctrl_pm_select_default_state(codec_dai->dev);
 189         pm_runtime_get_sync(cpu_dai->dev);
 190         pm_runtime_get_sync(codec_dai->dev);
 191         pm_runtime_get_sync(platform->dev);
 192
 193         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 194
 195         /* startup the audio subsystem */
 196         if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
 197                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 198                 if (ret < 0) {
 199                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 200                                 " %s: %d\n", cpu_dai->name, ret);
 201                         goto out;
 202                 }
 203         }
 204
 205         if (platform->driver->ops && platform->driver->ops->open) {
 206                 ret = platform->driver->ops->open(substream);
 207                 if (ret < 0) {
 208                         dev_err(platform->dev, "ASoC: can't open platform"
 209                                 " %s: %d\n", platform->name, ret);
 210                         goto platform_err;
 211                 }
 212         }
 213
 214         if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
 215                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
 216                 if (ret < 0) {
 217                         dev_err(codec_dai->dev, "ASoC: can't open codec"
 218                                 " %s: %d\n", codec_dai->name, ret);
 219                         goto codec_dai_err;
 220                 }
 221         }
 222
 223         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 224                 ret = rtd->dai_link->ops->startup(substream);
 225                 if (ret < 0) {
 226                         pr_err("ASoC: %s startup failed: %d\n",
 227                                rtd->dai_link->name, ret);
 228                         goto machine_err;
 229                 }
 230         }
 231
 232         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 233         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 234                 goto dynamic;
 235
 236         /* Check that the codec and cpu DAIs are compatible */
 237         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 238                 soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->playback,
 239                         &cpu_dai_drv->playback);
 240         } else {
 241                 soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->capture,
 242                         &cpu_dai_drv->capture);
 243         }
 244
 245         ret = -EINVAL;
 246         snd_pcm_limit_hw_rates(runtime);
 247         if (!runtime->hw.rates) {
 248                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 249                         codec_dai->name, cpu_dai->name);
 250                 goto config_err;
 251         }
 252         if (!runtime->hw.formats) {
 253                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 254                         codec_dai->name, cpu_dai->name);
 255                 goto config_err;
 256         }
 257         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 258             runtime->hw.channels_min > runtime->hw.channels_max) {
 259                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 260                                 codec_dai->name, cpu_dai->name);
 261                 goto config_err;
 262         }
 263
 264         soc_pcm_apply_msb(substream, codec_dai);
 265         soc_pcm_apply_msb(substream, cpu_dai);
 266
 267         /* Symmetry only applies if we've already got an active stream. */
 268         if (cpu_dai->active) {
 269                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 270                 if (ret != 0)
 271                         goto config_err;
 272         }
 273
 274         if (codec_dai->active) {
 275                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
 276                 if (ret != 0)
 277                         goto config_err;
 278         }
 279
 280         pr_debug("ASoC: %s <-> %s info:\n",
 281                         codec_dai->name, cpu_dai->name);
 282         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 283         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 284                  runtime->hw.channels_max);
 285         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 286                  runtime->hw.rate_max);
 287
 288 dynamic:
 289         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 290                 cpu_dai->playback_active++;
 291                 codec_dai->playback_active++;
 292         } else {
 293                 cpu_dai->capture_active++;
 294                 codec_dai->capture_active++;
 295         }
 296         cpu_dai->active++;
 297         codec_dai->active++;
 298         rtd->codec->active++;
 299         mutex_unlock(&rtd->pcm_mutex);
 300         return 0;
 301
 302 config_err:
 303         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 304                 rtd->dai_link->ops->shutdown(substream);
 305
 306 machine_err:
 307         if (codec_dai->driver->ops->shutdown)
 308                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 309
 310 codec_dai_err:
 311         if (platform->driver->ops && platform->driver->ops->close)
 312                 platform->driver->ops->close(substream);
 313
 314 platform_err:
 315         if (cpu_dai->driver->ops->shutdown)
 316                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 317 out:
 318         mutex_unlock(&rtd->pcm_mutex);
 319
 320         pm_runtime_put(platform->dev);
 321         pm_runtime_put(codec_dai->dev);
 322         pm_runtime_put(cpu_dai->dev);
 323         if (!codec_dai->active)
 324                 pinctrl_pm_select_sleep_state(codec_dai->dev);
 325         if (!cpu_dai->active)
 326                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 327
 328         return ret;
 329 }
 330
 331 /*
 332  * Power down the audio subsystem pmdown_time msecs after close is called.
 333  * This is to ensure there are no pops or clicks in between any music tracks
 334  * due to DAPM power cycling.
 335  */
 336 static void close_delayed_work(struct work_struct *work)
 337 {
 338         struct snd_soc_pcm_runtime *rtd =
 339                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 340         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 341
 342         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 343
 344         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 345                  codec_dai->driver->playback.stream_name,
 346                  codec_dai->playback_active ? "active" : "inactive",
 347                  rtd->pop_wait ? "yes" : "no");
 348
 349         /* are we waiting on this codec DAI stream */
 350         if (rtd->pop_wait == 1) {
 351                 rtd->pop_wait = 0;
 352                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 353                                           SND_SOC_DAPM_STREAM_STOP);
 354         }
 355
 356         mutex_unlock(&rtd->pcm_mutex);
 357 }
 358
 359 /*
 360  * Called by ALSA when a PCM substream is closed. Private data can be
 361  * freed here. The cpu DAI, codec DAI, machine and platform are also
 362  * shutdown.
 363  */
 364 static int soc_pcm_close(struct snd_pcm_substream *substream)
 365 {
 366         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 367         struct snd_soc_platform *platform = rtd->platform;
 368         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 369         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 370         struct snd_soc_codec *codec = rtd->codec;
 371
 372         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 373
 374         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 375                 cpu_dai->playback_active--;
 376                 codec_dai->playback_active--;
 377         } else {
 378                 cpu_dai->capture_active--;
 379                 codec_dai->capture_active--;
 380         }
 381
 382         cpu_dai->active--;
 383         codec_dai->active--;
 384         codec->active--;
 385
 386         /* clear the corresponding DAIs rate when inactive */
 387         if (!cpu_dai->active)
 388                 cpu_dai->rate = 0;
 389
 390         if (!codec_dai->active)
 391                 codec_dai->rate = 0;
 392
 393         /* Muting the DAC suppresses artifacts caused during digital
 394          * shutdown, for example from stopping clocks.
 395          */
 396         snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
 397
 398         if (cpu_dai->driver->ops->shutdown)
 399                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 400
 401         if (codec_dai->driver->ops->shutdown)
 402                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 403
 404         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 405                 rtd->dai_link->ops->shutdown(substream);
 406
 407         if (platform->driver->ops && platform->driver->ops->close)
 408                 platform->driver->ops->close(substream);
 409         cpu_dai->runtime = NULL;
 410
 411         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 412                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 413                     rtd->dai_link->ignore_pmdown_time) {
 414                         /* powered down playback stream now */
 415                         snd_soc_dapm_stream_event(rtd,
 416                                                   SNDRV_PCM_STREAM_PLAYBACK,
 417                                                   SND_SOC_DAPM_STREAM_STOP);
 418                 } else {
 419                         /* start delayed pop wq here for playback streams */
 420                         rtd->pop_wait = 1;
 421                         queue_delayed_work(system_power_efficient_wq,
 422                                            &rtd->delayed_work,
 423                                            msecs_to_jiffies(rtd->pmdown_time));
 424                 }
 425         } else {
 426                 /* capture streams can be powered down now */
 427                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 428                                           SND_SOC_DAPM_STREAM_STOP);
 429         }
 430
 431         mutex_unlock(&rtd->pcm_mutex);
 432
 433         pm_runtime_put(platform->dev);
 434         pm_runtime_put(codec_dai->dev);
 435         pm_runtime_put(cpu_dai->dev);
 436         if (!codec_dai->active)
 437                 pinctrl_pm_select_sleep_state(codec_dai->dev);
 438         if (!cpu_dai->active)
 439                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 440
 441         return 0;
 442 }
 443
 444 /*
 445  * Called by ALSA when the PCM substream is prepared, can set format, sample
 446  * rate, etc.  This function is non atomic and can be called multiple times,
 447  * it can refer to the runtime info.
 448  */
 449 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 450 {
 451         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 452         struct snd_soc_platform *platform = rtd->platform;
 453         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 454         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 455         int ret = 0;
 456
 457         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 458
 459         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 460                 ret = rtd->dai_link->ops->prepare(substream);
 461                 if (ret < 0) {
 462                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 463                                 " %d\n", ret);
 464                         goto out;
 465                 }
 466         }
 467
 468         if (platform->driver->ops && platform->driver->ops->prepare) {
 469                 ret = platform->driver->ops->prepare(substream);
 470                 if (ret < 0) {
 471                         dev_err(platform->dev, "ASoC: platform prepare error:"
 472                                 " %d\n", ret);
 473                         goto out;
 474                 }
 475         }
 476
 477         if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
 478                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
 479                 if (ret < 0) {
 480                         dev_err(codec_dai->dev, "ASoC: DAI prepare error: %d\n",
 481                                 ret);
 482                         goto out;
 483                 }
 484         }
 485
 486         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 487                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 488                 if (ret < 0) {
 489                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
 490                                 ret);
 491                         goto out;
 492                 }
 493         }
 494
 495         /* cancel any delayed stream shutdown that is pending */
 496         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 497             rtd->pop_wait) {
 498                 rtd->pop_wait = 0;
 499                 cancel_delayed_work(&rtd->delayed_work);
 500         }
 501
 502         snd_soc_dapm_stream_event(rtd, substream->stream,
 503                         SND_SOC_DAPM_STREAM_START);
 504
 505         snd_soc_dai_digital_mute(codec_dai, 0, substream->stream);
 506
 507 out:
 508         mutex_unlock(&rtd->pcm_mutex);
 509         return ret;
 510 }
 511
 512 /*
 513  * Called by ALSA when the hardware params are set by application. This
 514  * function can also be called multiple times and can allocate buffers
 515  * (using snd_pcm_lib_* ). It's non-atomic.
 516  */
 517 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 518                                 struct snd_pcm_hw_params *params)
 519 {
 520         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 521         struct snd_soc_platform *platform = rtd->platform;
 522         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 523         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 524         int ret = 0;
 525
 526         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 527
 528         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 529                 ret = rtd->dai_link->ops->hw_params(substream, params);
 530                 if (ret < 0) {
 531                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 532                                 " failed: %d\n", ret);
 533                         goto out;
 534                 }
 535         }
 536
 537         if (codec_dai->driver->ops && codec_dai->driver->ops->hw_params) {
 538                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
 539                 if (ret < 0) {
 540                         dev_err(codec_dai->dev, "ASoC: can't set %s hw params:"
 541                                 " %d\n", codec_dai->name, ret);
 542                         goto codec_err;
 543                 }
 544         }
 545
 546         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_params) {
 547                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
 548                 if (ret < 0) {
 549                         dev_err(cpu_dai->dev, "ASoC: %s hw params failed: %d\n",
 550                                 cpu_dai->name, ret);
 551                         goto interface_err;
 552                 }
 553         }
 554
 555         if (platform->driver->ops && platform->driver->ops->hw_params) {
 556                 ret = platform->driver->ops->hw_params(substream, params);
 557                 if (ret < 0) {
 558                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 559                                platform->name, ret);
 560                         goto platform_err;
 561                 }
 562         }
 563
 564         /* store the rate for each DAIs */
 565         cpu_dai->rate = params_rate(params);
 566         codec_dai->rate = params_rate(params);
 567
 568 out:
 569         mutex_unlock(&rtd->pcm_mutex);
 570         return ret;
 571
 572 platform_err:
 573         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 574                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 575
 576 interface_err:
 577         if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 578                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 579
 580 codec_err:
 581         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 582                 rtd->dai_link->ops->hw_free(substream);
 583
 584         mutex_unlock(&rtd->pcm_mutex);
 585         return ret;
 586 }
 587
 588 /*
 589  * Frees resources allocated by hw_params, can be called multiple times
 590  */
 591 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 592 {
 593         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 594         struct snd_soc_platform *platform = rtd->platform;
 595         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 596         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 597         struct snd_soc_codec *codec = rtd->codec;
 598
 599         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 600
 601         /* apply codec digital mute */
 602         if (!codec->active)
 603                 snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
 604
 605         /* free any machine hw params */
 606         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 607                 rtd->dai_link->ops->hw_free(substream);
 608
 609         /* free any DMA resources */
 610         if (platform->driver->ops && platform->driver->ops->hw_free)
 611                 platform->driver->ops->hw_free(substream);
 612
 613         /* now free hw params for the DAIs  */
 614         if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 615                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 616
 617         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 618                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 619
 620         mutex_unlock(&rtd->pcm_mutex);
 621         return 0;
 622 }
 623
 624 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 625 {
 626         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 627         struct snd_soc_platform *platform = rtd->platform;
 628         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 629         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 630         int ret;
 631
 632         if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
 633                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
 634                 if (ret < 0)
 635                         return ret;
 636         }
 637
 638         if (platform->driver->ops && platform->driver->ops->trigger) {
 639                 ret = platform->driver->ops->trigger(substream, cmd);
 640                 if (ret < 0)
 641                         return ret;
 642         }
 643
 644         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
 645                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 646                 if (ret < 0)
 647                         return ret;
 648         }
 649         return 0;
 650 }
 651
 652 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
 653                                    int cmd)
 654 {
 655         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 656         struct snd_soc_platform *platform = rtd->platform;
 657         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 658         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 659         int ret;
 660
 661         if (codec_dai->driver->ops &&
 662             codec_dai->driver->ops->bespoke_trigger) {
 663                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
 664                 if (ret < 0)
 665                         return ret;
 666         }
 667
 668         if (platform->driver->ops && platform->driver->bespoke_trigger) {
 669                 ret = platform->driver->bespoke_trigger(substream, cmd);
 670                 if (ret < 0)
 671                         return ret;
 672         }
 673
 674         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
 675                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
 676                 if (ret < 0)
 677                         return ret;
 678         }
 679         return 0;
 680 }
 681 /*
 682  * soc level wrapper for pointer callback
 683  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 684  * the runtime->delay will be updated accordingly.
 685  */
 686 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 687 {
 688         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 689         struct snd_soc_platform *platform = rtd->platform;
 690         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 691         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 692         struct snd_pcm_runtime *runtime = substream->runtime;
 693         snd_pcm_uframes_t offset = 0;
 694         snd_pcm_sframes_t delay = 0;
 695
 696         if (platform->driver->ops && platform->driver->ops->pointer)
 697                 offset = platform->driver->ops->pointer(substream);
 698
 699         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
 700                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 701
 702         if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
 703                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 704
 705         if (platform->driver->delay)
 706                 delay += platform->driver->delay(substream, codec_dai);
 707
 708         runtime->delay = delay;
 709
 710         return offset;
 711 }
 712
 713 /* connect a FE and BE */
 714 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
 715                 struct snd_soc_pcm_runtime *be, int stream)
 716 {
 717         struct snd_soc_dpcm *dpcm;
 718
 719         /* only add new dpcms */
 720         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 721                 if (dpcm->be == be && dpcm->fe == fe)
 722                         return 0;
 723         }
 724
 725         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
 726         if (!dpcm)
 727                 return -ENOMEM;
 728
 729         dpcm->be = be;
 730         dpcm->fe = fe;
 731         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
 732         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
 733         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
 734         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
 735
 736         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
 737                         stream ? "capture" : "playback",  fe->dai_link->name,
 738                         stream ? "<-" : "->", be->dai_link->name);
 739
 740 #ifdef CONFIG_DEBUG_FS
 741         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
 742                         fe->debugfs_dpcm_root, &dpcm->state);
 743 #endif
 744         return 1;
 745 }
 746
 747 /* reparent a BE onto another FE */
 748 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
 749                         struct snd_soc_pcm_runtime *be, int stream)
 750 {
 751         struct snd_soc_dpcm *dpcm;
 752         struct snd_pcm_substream *fe_substream, *be_substream;
 753
 754         /* reparent if BE is connected to other FEs */
 755         if (!be->dpcm[stream].users)
 756                 return;
 757
 758         be_substream = snd_soc_dpcm_get_substream(be, stream);
 759
 760         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
 761                 if (dpcm->fe == fe)
 762                         continue;
 763
 764                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
 765                         stream ? "capture" : "playback",
 766                         dpcm->fe->dai_link->name,
 767                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 768
 769                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
 770                 be_substream->runtime = fe_substream->runtime;
 771                 break;
 772         }
 773 }
 774
 775 /* disconnect a BE and FE */
 776 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
 777 {
 778         struct snd_soc_dpcm *dpcm, *d;
 779
 780         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
 781                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
 782                                 stream ? "capture" : "playback",
 783                                 dpcm->be->dai_link->name);
 784
 785                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
 786                         continue;
 787
 788                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
 789                         stream ? "capture" : "playback", fe->dai_link->name,
 790                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 791
 792                 /* BEs still alive need new FE */
 793                 dpcm_be_reparent(fe, dpcm->be, stream);
 794
 795 #ifdef CONFIG_DEBUG_FS
 796                 debugfs_remove(dpcm->debugfs_state);
 797 #endif
 798                 list_del(&dpcm->list_be);
 799                 list_del(&dpcm->list_fe);
 800                 kfree(dpcm);
 801         }
 802 }
 803
 804 /* get BE for DAI widget and stream */
 805 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
 806                 struct snd_soc_dapm_widget *widget, int stream)
 807 {
 808         struct snd_soc_pcm_runtime *be;
 809         int i;
 810
 811         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 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->playback_widget == widget ||
 819                                 be->codec_dai->playback_widget == widget)
 820                                 return be;
 821                 }
 822         } else {
 823
 824                 for (i = 0; i < card->num_links; i++) {
 825                         be = &card->rtd[i];
 826
 827                         if (!be->dai_link->no_pcm)
 828                                 continue;
 829
 830                         if (be->cpu_dai->capture_widget == widget ||
 831                                 be->codec_dai->capture_widget == widget)
 832                                 return be;
 833                 }
 834         }
 835
 836         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
 837                 stream ? "capture" : "playback", widget->name);
 838         return NULL;
 839 }
 840
 841 static inline struct snd_soc_dapm_widget *
 842         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 843 {
 844         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 845                 return rtd->cpu_dai->playback_widget;
 846         else
 847                 return rtd->cpu_dai->capture_widget;
 848 }
 849
 850 static inline struct snd_soc_dapm_widget *
 851         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 852 {
 853         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 854                 return rtd->codec_dai->playback_widget;
 855         else
 856                 return rtd->codec_dai->capture_widget;
 857 }
 858
 859 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 860                 struct snd_soc_dapm_widget *widget)
 861 {
 862         int i;
 863
 864         for (i = 0; i < list->num_widgets; i++) {
 865                 if (widget == list->widgets[i])
 866                         return 1;
 867         }
 868
 869         return 0;
 870 }
 871
 872 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 873         int stream, struct snd_soc_dapm_widget_list **list_)
 874 {
 875         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
 876         struct snd_soc_dapm_widget_list *list;
 877         int paths;
 878
 879         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
 880                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
 881         if (list == NULL)
 882                 return -ENOMEM;
 883
 884         /* get number of valid DAI paths and their widgets */
 885         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
 886
 887         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
 888                         stream ? "capture" : "playback");
 889
 890         *list_ = list;
 891         return paths;
 892 }
 893
 894 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 895 {
 896         kfree(*list);
 897 }
 898
 899 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
 900         struct snd_soc_dapm_widget_list **list_)
 901 {
 902         struct snd_soc_dpcm *dpcm;
 903         struct snd_soc_dapm_widget_list *list = *list_;
 904         struct snd_soc_dapm_widget *widget;
 905         int prune = 0;
 906
 907         /* Destroy any old FE <--> BE connections */
 908         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 909
 910                 /* is there a valid CPU DAI widget for this BE */
 911                 widget = rtd_get_cpu_widget(dpcm->be, stream);
 912
 913                 /* prune the BE if it's no longer in our active list */
 914                 if (widget && widget_in_list(list, widget))
 915                         continue;
 916
 917                 /* is there a valid CODEC DAI widget for this BE */
 918                 widget = rtd_get_codec_widget(dpcm->be, stream);
 919
 920                 /* prune the BE if it's no longer in our active list */
 921                 if (widget && widget_in_list(list, widget))
 922                         continue;
 923
 924                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
 925                         stream ? "capture" : "playback",
 926                         dpcm->be->dai_link->name, fe->dai_link->name);
 927                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 928                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 929                 prune++;
 930         }
 931
 932         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
 933         return prune;
 934 }
 935
 936 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
 937         struct snd_soc_dapm_widget_list **list_)
 938 {
 939         struct snd_soc_card *card = fe->card;
 940         struct snd_soc_dapm_widget_list *list = *list_;
 941         struct snd_soc_pcm_runtime *be;
 942         int i, new = 0, err;
 943
 944         /* Create any new FE <--> BE connections */
 945         for (i = 0; i < list->num_widgets; i++) {
 946
 947                 switch (list->widgets[i]->id) {
 948                 case snd_soc_dapm_dai_in:
 949                 case snd_soc_dapm_dai_out:
 950                         break;
 951                 default:
 952                         continue;
 953                 }
 954
 955                 /* is there a valid BE rtd for this widget */
 956                 be = dpcm_get_be(card, list->widgets[i], stream);
 957                 if (!be) {
 958                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
 959                                         list->widgets[i]->name);
 960                         continue;
 961                 }
 962
 963                 /* make sure BE is a real BE */
 964                 if (!be->dai_link->no_pcm)
 965                         continue;
 966
 967                 /* don't connect if FE is not running */
 968                 if (!fe->dpcm[stream].runtime)
 969                         continue;
 970
 971                 /* newly connected FE and BE */
 972                 err = dpcm_be_connect(fe, be, stream);
 973                 if (err < 0) {
 974                         dev_err(fe->dev, "ASoC: can't connect %s\n",
 975                                 list->widgets[i]->name);
 976                         break;
 977                 } else if (err == 0) /* already connected */
 978                         continue;
 979
 980                 /* new */
 981                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
 982                 new++;
 983         }
 984
 985         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
 986         return new;
 987 }
 988
 989 /*
 990  * Find the corresponding BE DAIs that source or sink audio to this
 991  * FE substream.
 992  */
 993 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 994         int stream, struct snd_soc_dapm_widget_list **list, int new)
 995 {
 996         if (new)
 997                 return dpcm_add_paths(fe, stream, list);
 998         else
 999                 return dpcm_prune_paths(fe, stream, list);
1000 }
1001
1002 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1003 {
1004         struct snd_soc_dpcm *dpcm;
1005
1006         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1007                 dpcm->be->dpcm[stream].runtime_update =
1008                                                 SND_SOC_DPCM_UPDATE_NO;
1009 }
1010
1011 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1012         int stream)
1013 {
1014         struct snd_soc_dpcm *dpcm;
1015
1016         /* disable any enabled and non active backends */
1017         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1018
1019                 struct snd_soc_pcm_runtime *be = dpcm->be;
1020                 struct snd_pcm_substream *be_substream =
1021                         snd_soc_dpcm_get_substream(be, stream);
1022
1023                 if (be->dpcm[stream].users == 0)
1024                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1025                                 stream ? "capture" : "playback",
1026                                 be->dpcm[stream].state);
1027
1028                 if (--be->dpcm[stream].users != 0)
1029                         continue;
1030
1031                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1032                         continue;
1033
1034                 soc_pcm_close(be_substream);
1035                 be_substream->runtime = NULL;
1036                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1037         }
1038 }
1039
1040 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1041 {
1042         struct snd_soc_dpcm *dpcm;
1043         int err, count = 0;
1044
1045         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1046         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1047
1048                 struct snd_soc_pcm_runtime *be = dpcm->be;
1049                 struct snd_pcm_substream *be_substream =
1050                         snd_soc_dpcm_get_substream(be, stream);
1051
1052                 if (!be_substream) {
1053                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1054                                 stream ? "capture" : "playback");
1055                         continue;
1056                 }
1057
1058                 /* is this op for this BE ? */
1059                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1060                         continue;
1061
1062                 /* first time the dpcm is open ? */
1063                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1064                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1065                                 stream ? "capture" : "playback",
1066                                 be->dpcm[stream].state);
1067
1068                 if (be->dpcm[stream].users++ != 0)
1069                         continue;
1070
1071                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1072                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1073                         continue;
1074
1075                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1076                         stream ? "capture" : "playback", be->dai_link->name);
1077
1078                 be_substream->runtime = be->dpcm[stream].runtime;
1079                 err = soc_pcm_open(be_substream);
1080                 if (err < 0) {
1081                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1082                         be->dpcm[stream].users--;
1083                         if (be->dpcm[stream].users < 0)
1084                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1085                                         stream ? "capture" : "playback",
1086                                         be->dpcm[stream].state);
1087
1088                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1089                         goto unwind;
1090                 }
1091
1092                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1093                 count++;
1094         }
1095
1096         return count;
1097
1098 unwind:
1099         /* disable any enabled and non active backends */
1100         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1101                 struct snd_soc_pcm_runtime *be = dpcm->be;
1102                 struct snd_pcm_substream *be_substream =
1103                         snd_soc_dpcm_get_substream(be, stream);
1104
1105                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1106                         continue;
1107
1108                 if (be->dpcm[stream].users == 0)
1109                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1110                                 stream ? "capture" : "playback",
1111                                 be->dpcm[stream].state);
1112
1113                 if (--be->dpcm[stream].users != 0)
1114                         continue;
1115
1116                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1117                         continue;
1118
1119                 soc_pcm_close(be_substream);
1120                 be_substream->runtime = NULL;
1121                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1122         }
1123
1124         return err;
1125 }
1126
1127 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1128 {
1129         struct snd_pcm_runtime *runtime = substream->runtime;
1130         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1131         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1132         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1133
1134         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1135                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1136                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1137                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1138                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1139                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1140                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1141         } else {
1142                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1143                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1144                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1145                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1146                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1147                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1148         }
1149 }
1150
1151 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1152 {
1153         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1154         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1155         int stream = fe_substream->stream, ret = 0;
1156
1157         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1158
1159         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1160         if (ret < 0) {
1161                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1162                 goto be_err;
1163         }
1164
1165         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1166
1167         /* start the DAI frontend */
1168         ret = soc_pcm_open(fe_substream);
1169         if (ret < 0) {
1170                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1171                 goto unwind;
1172         }
1173
1174         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1175
1176         dpcm_set_fe_runtime(fe_substream);
1177         snd_pcm_limit_hw_rates(runtime);
1178
1179         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1180         return 0;
1181
1182 unwind:
1183         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1184 be_err:
1185         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1186         return ret;
1187 }
1188
1189 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1190 {
1191         struct snd_soc_dpcm *dpcm;
1192
1193         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1194         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1195
1196                 struct snd_soc_pcm_runtime *be = dpcm->be;
1197                 struct snd_pcm_substream *be_substream =
1198                         snd_soc_dpcm_get_substream(be, stream);
1199
1200                 /* is this op for this BE ? */
1201                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1202                         continue;
1203
1204                 if (be->dpcm[stream].users == 0)
1205                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1206                                 stream ? "capture" : "playback",
1207                                 be->dpcm[stream].state);
1208
1209                 if (--be->dpcm[stream].users != 0)
1210                         continue;
1211
1212                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1213                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1214                         continue;
1215
1216                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1217                         dpcm->fe->dai_link->name);
1218
1219                 soc_pcm_close(be_substream);
1220                 be_substream->runtime = NULL;
1221
1222                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1223         }
1224         return 0;
1225 }
1226
1227 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1228 {
1229         struct snd_soc_pcm_runtime *fe = substream->private_data;
1230         int stream = substream->stream;
1231
1232         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1233
1234         /* shutdown the BEs */
1235         dpcm_be_dai_shutdown(fe, substream->stream);
1236
1237         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1238
1239         /* now shutdown the frontend */
1240         soc_pcm_close(substream);
1241
1242         /* run the stream event for each BE */
1243         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1244
1245         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1246         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1247         return 0;
1248 }
1249
1250 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1251 {
1252         struct snd_soc_dpcm *dpcm;
1253
1254         /* only hw_params backends that are either sinks or sources
1255          * to this frontend DAI */
1256         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1257
1258                 struct snd_soc_pcm_runtime *be = dpcm->be;
1259                 struct snd_pcm_substream *be_substream =
1260                         snd_soc_dpcm_get_substream(be, stream);
1261
1262                 /* is this op for this BE ? */
1263                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1264                         continue;
1265
1266                 /* only free hw when no longer used - check all FEs */
1267                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1268                                 continue;
1269
1270                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1271                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1272                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1273                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1274                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1275                         continue;
1276
1277                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1278                         dpcm->fe->dai_link->name);
1279
1280                 soc_pcm_hw_free(be_substream);
1281
1282                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1283         }
1284
1285         return 0;
1286 }
1287
1288 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1289 {
1290         struct snd_soc_pcm_runtime *fe = substream->private_data;
1291         int err, stream = substream->stream;
1292
1293         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1294         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1295
1296         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1297
1298         /* call hw_free on the frontend */
1299         err = soc_pcm_hw_free(substream);
1300         if (err < 0)
1301                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1302                         fe->dai_link->name);
1303
1304         /* only hw_params backends that are either sinks or sources
1305          * to this frontend DAI */
1306         err = dpcm_be_dai_hw_free(fe, stream);
1307
1308         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1309         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1310
1311         mutex_unlock(&fe->card->mutex);
1312         return 0;
1313 }
1314
1315 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1316 {
1317         struct snd_soc_dpcm *dpcm;
1318         int ret;
1319
1320         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1321
1322                 struct snd_soc_pcm_runtime *be = dpcm->be;
1323                 struct snd_pcm_substream *be_substream =
1324                         snd_soc_dpcm_get_substream(be, stream);
1325
1326                 /* is this op for this BE ? */
1327                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1328                         continue;
1329
1330                 /* only allow hw_params() if no connected FEs are running */
1331                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1332                         continue;
1333
1334                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1335                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1336                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1337                         continue;
1338
1339                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1340                         dpcm->fe->dai_link->name);
1341
1342                 /* copy params for each dpcm */
1343                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1344                                 sizeof(struct snd_pcm_hw_params));
1345
1346                 /* perform any hw_params fixups */
1347                 if (be->dai_link->be_hw_params_fixup) {
1348                         ret = be->dai_link->be_hw_params_fixup(be,
1349                                         &dpcm->hw_params);
1350                         if (ret < 0) {
1351                                 dev_err(be->dev,
1352                                         "ASoC: hw_params BE fixup failed %d\n",
1353                                         ret);
1354                                 goto unwind;
1355                         }
1356                 }
1357
1358                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1359                 if (ret < 0) {
1360                         dev_err(dpcm->be->dev,
1361                                 "ASoC: hw_params BE failed %d\n", ret);
1362                         goto unwind;
1363                 }
1364
1365                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1366         }
1367         return 0;
1368
1369 unwind:
1370         /* disable any enabled and non active backends */
1371         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1372                 struct snd_soc_pcm_runtime *be = dpcm->be;
1373                 struct snd_pcm_substream *be_substream =
1374                         snd_soc_dpcm_get_substream(be, stream);
1375
1376                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1377                         continue;
1378
1379                 /* only allow hw_free() if no connected FEs are running */
1380                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1381                         continue;
1382
1383                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1384                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1385                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1386                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1387                         continue;
1388
1389                 soc_pcm_hw_free(be_substream);
1390         }
1391
1392         return ret;
1393 }
1394
1395 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1396                                  struct snd_pcm_hw_params *params)
1397 {
1398         struct snd_soc_pcm_runtime *fe = substream->private_data;
1399         int ret, stream = substream->stream;
1400
1401         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1402         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1403
1404         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1405                         sizeof(struct snd_pcm_hw_params));
1406         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1407         if (ret < 0) {
1408                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1409                 goto out;
1410         }
1411
1412         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1413                         fe->dai_link->name, params_rate(params),
1414                         params_channels(params), params_format(params));
1415
1416         /* call hw_params on the frontend */
1417         ret = soc_pcm_hw_params(substream, params);
1418         if (ret < 0) {
1419                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1420                 dpcm_be_dai_hw_free(fe, stream);
1421          } else
1422                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1423
1424 out:
1425         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1426         mutex_unlock(&fe->card->mutex);
1427         return ret;
1428 }
1429
1430 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1431                 struct snd_pcm_substream *substream, int cmd)
1432 {
1433         int ret;
1434
1435         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1436                         dpcm->fe->dai_link->name, cmd);
1437
1438         ret = soc_pcm_trigger(substream, cmd);
1439         if (ret < 0)
1440                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1441
1442         return ret;
1443 }
1444
1445 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1446                                int cmd)
1447 {
1448         struct snd_soc_dpcm *dpcm;
1449         int ret = 0;
1450
1451         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1452
1453                 struct snd_soc_pcm_runtime *be = dpcm->be;
1454                 struct snd_pcm_substream *be_substream =
1455                         snd_soc_dpcm_get_substream(be, stream);
1456
1457                 /* is this op for this BE ? */
1458                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1459                         continue;
1460
1461                 switch (cmd) {
1462                 case SNDRV_PCM_TRIGGER_START:
1463                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1464                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1465                                 continue;
1466
1467                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1468                         if (ret)
1469                                 return ret;
1470
1471                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1472                         break;
1473                 case SNDRV_PCM_TRIGGER_RESUME:
1474                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1475                                 continue;
1476
1477                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1478                         if (ret)
1479                                 return ret;
1480
1481                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1482                         break;
1483                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1484                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1485                                 continue;
1486
1487                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1488                         if (ret)
1489                                 return ret;
1490
1491                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1492                         break;
1493                 case SNDRV_PCM_TRIGGER_STOP:
1494                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1495                                 continue;
1496
1497                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1498                                 continue;
1499
1500                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1501                         if (ret)
1502                                 return ret;
1503
1504                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1505                         break;
1506                 case SNDRV_PCM_TRIGGER_SUSPEND:
1507                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1508                                 continue;
1509
1510                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1511                                 continue;
1512
1513                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1514                         if (ret)
1515                                 return ret;
1516
1517                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1518                         break;
1519                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1520                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1521                                 continue;
1522
1523                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1524                                 continue;
1525
1526                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1527                         if (ret)
1528                                 return ret;
1529
1530                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1531                         break;
1532                 }
1533         }
1534
1535         return ret;
1536 }
1537 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1538
1539 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1540 {
1541         struct snd_soc_pcm_runtime *fe = substream->private_data;
1542         int stream = substream->stream, ret;
1543         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1544
1545         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1546
1547         switch (trigger) {
1548         case SND_SOC_DPCM_TRIGGER_PRE:
1549                 /* call trigger on the frontend before the backend. */
1550
1551                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1552                                 fe->dai_link->name, cmd);
1553
1554                 ret = soc_pcm_trigger(substream, cmd);
1555                 if (ret < 0) {
1556                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1557                         goto out;
1558                 }
1559
1560                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1561                 break;
1562         case SND_SOC_DPCM_TRIGGER_POST:
1563                 /* call trigger on the frontend after the backend. */
1564
1565                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1566                 if (ret < 0) {
1567                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1568                         goto out;
1569                 }
1570
1571                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1572                                 fe->dai_link->name, cmd);
1573
1574                 ret = soc_pcm_trigger(substream, cmd);
1575                 break;
1576         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1577                 /* bespoke trigger() - handles both FE and BEs */
1578
1579                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1580                                 fe->dai_link->name, cmd);
1581
1582                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1583                 if (ret < 0) {
1584                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1585                         goto out;
1586                 }
1587                 break;
1588         default:
1589                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1590                                 fe->dai_link->name);
1591                 ret = -EINVAL;
1592                 goto out;
1593         }
1594
1595         switch (cmd) {
1596         case SNDRV_PCM_TRIGGER_START:
1597         case SNDRV_PCM_TRIGGER_RESUME:
1598         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1599                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1600                 break;
1601         case SNDRV_PCM_TRIGGER_STOP:
1602         case SNDRV_PCM_TRIGGER_SUSPEND:
1603         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1604                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1605                 break;
1606         }
1607
1608 out:
1609         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1610         return ret;
1611 }
1612
1613 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1614 {
1615         struct snd_soc_dpcm *dpcm;
1616         int ret = 0;
1617
1618         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1619
1620                 struct snd_soc_pcm_runtime *be = dpcm->be;
1621                 struct snd_pcm_substream *be_substream =
1622                         snd_soc_dpcm_get_substream(be, stream);
1623
1624                 /* is this op for this BE ? */
1625                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1626                         continue;
1627
1628                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1629                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1630                         continue;
1631
1632                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
1633                         dpcm->fe->dai_link->name);
1634
1635                 ret = soc_pcm_prepare(be_substream);
1636                 if (ret < 0) {
1637                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
1638                                 ret);
1639                         break;
1640                 }
1641
1642                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1643         }
1644         return ret;
1645 }
1646
1647 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1648 {
1649         struct snd_soc_pcm_runtime *fe = substream->private_data;
1650         int stream = substream->stream, ret = 0;
1651
1652         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1653
1654         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
1655
1656         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1657
1658         /* there is no point preparing this FE if there are no BEs */
1659         if (list_empty(&fe->dpcm[stream].be_clients)) {
1660                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
1661                                 fe->dai_link->name);
1662                 ret = -EINVAL;
1663                 goto out;
1664         }
1665
1666         ret = dpcm_be_dai_prepare(fe, substream->stream);
1667         if (ret < 0)
1668                 goto out;
1669
1670         /* call prepare on the frontend */
1671         ret = soc_pcm_prepare(substream);
1672         if (ret < 0) {
1673                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
1674                         fe->dai_link->name);
1675                 goto out;
1676         }
1677
1678         /* run the stream event for each BE */
1679         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1680         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1681
1682 out:
1683         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1684         mutex_unlock(&fe->card->mutex);
1685
1686         return ret;
1687 }
1688
1689 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1690                      unsigned int cmd, void *arg)
1691 {
1692         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1693         struct snd_soc_platform *platform = rtd->platform;
1694
1695         if (platform->driver->ops && platform->driver->ops->ioctl)
1696                 return platform->driver->ops->ioctl(substream, cmd, arg);
1697         return snd_pcm_lib_ioctl(substream, cmd, arg);
1698 }
1699
1700 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1701 {
1702         struct snd_pcm_substream *substream =
1703                 snd_soc_dpcm_get_substream(fe, stream);
1704         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1705         int err;
1706
1707         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
1708                         stream ? "capture" : "playback", fe->dai_link->name);
1709
1710         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1711                 /* call bespoke trigger - FE takes care of all BE triggers */
1712                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
1713                                 fe->dai_link->name);
1714
1715                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1716                 if (err < 0)
1717                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1718         } else {
1719                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
1720                         fe->dai_link->name);
1721
1722                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1723                 if (err < 0)
1724                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1725         }
1726
1727         err = dpcm_be_dai_hw_free(fe, stream);
1728         if (err < 0)
1729                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
1730
1731         err = dpcm_be_dai_shutdown(fe, stream);
1732         if (err < 0)
1733                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
1734
1735         /* run the stream event for each BE */
1736         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1737
1738         return 0;
1739 }
1740
1741 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1742 {
1743         struct snd_pcm_substream *substream =
1744                 snd_soc_dpcm_get_substream(fe, stream);
1745         struct snd_soc_dpcm *dpcm;
1746         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1747         int ret;
1748
1749         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
1750                         stream ? "capture" : "playback", fe->dai_link->name);
1751
1752         /* Only start the BE if the FE is ready */
1753         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1754                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1755                 return -EINVAL;
1756
1757         /* startup must always be called for new BEs */
1758         ret = dpcm_be_dai_startup(fe, stream);
1759         if (ret < 0)
1760                 goto disconnect;
1761
1762         /* keep going if FE state is > open */
1763         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1764                 return 0;
1765
1766         ret = dpcm_be_dai_hw_params(fe, stream);
1767         if (ret < 0)
1768                 goto close;
1769
1770         /* keep going if FE state is > hw_params */
1771         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1772                 return 0;
1773
1774
1775         ret = dpcm_be_dai_prepare(fe, stream);
1776         if (ret < 0)
1777                 goto hw_free;
1778
1779         /* run the stream event for each BE */
1780         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1781
1782         /* keep going if FE state is > prepare */
1783         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1784                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1785                 return 0;
1786
1787         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1788                 /* call trigger on the frontend - FE takes care of all BE triggers */
1789                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
1790                                 fe->dai_link->name);
1791
1792                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1793                 if (ret < 0) {
1794                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
1795                         goto hw_free;
1796                 }
1797         } else {
1798                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
1799                         fe->dai_link->name);
1800
1801                 ret = dpcm_be_dai_trigger(fe, stream,
1802                                         SNDRV_PCM_TRIGGER_START);
1803                 if (ret < 0) {
1804                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1805                         goto hw_free;
1806                 }
1807         }
1808
1809         return 0;
1810
1811 hw_free:
1812         dpcm_be_dai_hw_free(fe, stream);
1813 close:
1814         dpcm_be_dai_shutdown(fe, stream);
1815 disconnect:
1816         /* disconnect any non started BEs */
1817         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1818                 struct snd_soc_pcm_runtime *be = dpcm->be;
1819                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1820                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1821         }
1822
1823         return ret;
1824 }
1825
1826 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1827 {
1828         int ret;
1829
1830         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1831         ret = dpcm_run_update_startup(fe, stream);
1832         if (ret < 0)
1833                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
1834         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1835
1836         return ret;
1837 }
1838
1839 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1840 {
1841         int ret;
1842
1843         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1844         ret = dpcm_run_update_shutdown(fe, stream);
1845         if (ret < 0)
1846                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
1847         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1848
1849         return ret;
1850 }
1851
1852 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1853  * any DAI links.
1854  */
1855 int soc_dpcm_runtime_update(struct snd_soc_card *card)
1856 {
1857         int i, old, new, paths;
1858
1859         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1860         for (i = 0; i < card->num_rtd; i++) {
1861                 struct snd_soc_dapm_widget_list *list;
1862                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1863
1864                 /* make sure link is FE */
1865                 if (!fe->dai_link->dynamic)
1866                         continue;
1867
1868                 /* only check active links */
1869                 if (!fe->cpu_dai->active)
1870                         continue;
1871
1872                 /* DAPM sync will call this to update DSP paths */
1873                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
1874                         fe->dai_link->name);
1875
1876                 /* skip if FE doesn't have playback capability */
1877                 if (!fe->cpu_dai->driver->playback.channels_min)
1878                         goto capture;
1879
1880                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1881                 if (paths < 0) {
1882                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1883                                         fe->dai_link->name,  "playback");
1884                         mutex_unlock(&card->mutex);
1885                         return paths;
1886                 }
1887
1888                 /* update any new playback paths */
1889                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1890                 if (new) {
1891                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1892                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1893                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1894                 }
1895
1896                 /* update any old playback paths */
1897                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1898                 if (old) {
1899                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1900                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1901                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1902                 }
1903
1904 capture:
1905                 /* skip if FE doesn't have capture capability */
1906                 if (!fe->cpu_dai->driver->capture.channels_min)
1907                         continue;
1908
1909                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1910                 if (paths < 0) {
1911                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1912                                         fe->dai_link->name,  "capture");
1913                         mutex_unlock(&card->mutex);
1914                         return paths;
1915                 }
1916
1917                 /* update any new capture paths */
1918                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1919                 if (new) {
1920                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1921                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1922                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1923                 }
1924
1925                 /* update any old capture paths */
1926                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1927                 if (old) {
1928                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1929                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1930                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1931                 }
1932
1933                 dpcm_path_put(&list);
1934         }
1935
1936         mutex_unlock(&card->mutex);
1937         return 0;
1938 }
1939 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1940 {
1941         struct snd_soc_dpcm *dpcm;
1942         struct list_head *clients =
1943                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1944
1945         list_for_each_entry(dpcm, clients, list_be) {
1946
1947                 struct snd_soc_pcm_runtime *be = dpcm->be;
1948                 struct snd_soc_dai *dai = be->codec_dai;
1949                 struct snd_soc_dai_driver *drv = dai->driver;
1950
1951                 if (be->dai_link->ignore_suspend)
1952                         continue;
1953
1954                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
1955
1956                 if (drv->ops && drv->ops->digital_mute && dai->playback_active)
1957                         drv->ops->digital_mute(dai, mute);
1958         }
1959
1960         return 0;
1961 }
1962
1963 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1964 {
1965         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1966         struct snd_soc_dpcm *dpcm;
1967         struct snd_soc_dapm_widget_list *list;
1968         int ret;
1969         int stream = fe_substream->stream;
1970
1971         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1972         fe->dpcm[stream].runtime = fe_substream->runtime;
1973
1974         if (dpcm_path_get(fe, stream, &list) <= 0) {
1975                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
1976                         fe->dai_link->name, stream ? "capture" : "playback");
1977         }
1978
1979         /* calculate valid and active FE <-> BE dpcms */
1980         dpcm_process_paths(fe, stream, &list, 1);
1981
1982         ret = dpcm_fe_dai_startup(fe_substream);
1983         if (ret < 0) {
1984                 /* clean up all links */
1985                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1986                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1987
1988                 dpcm_be_disconnect(fe, stream);
1989                 fe->dpcm[stream].runtime = NULL;
1990         }
1991
1992         dpcm_clear_pending_state(fe, stream);
1993         dpcm_path_put(&list);
1994         mutex_unlock(&fe->card->mutex);
1995         return ret;
1996 }
1997
1998 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1999 {
2000         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2001         struct snd_soc_dpcm *dpcm;
2002         int stream = fe_substream->stream, ret;
2003
2004         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2005         ret = dpcm_fe_dai_shutdown(fe_substream);
2006
2007         /* mark FE's links ready to prune */
2008         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2009                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2010
2011         dpcm_be_disconnect(fe, stream);
2012
2013         fe->dpcm[stream].runtime = NULL;
2014         mutex_unlock(&fe->card->mutex);
2015         return ret;
2016 }
2017
2018 /* create a new pcm */
2019 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2020 {
2021         struct snd_soc_platform *platform = rtd->platform;
2022         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2023         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2024         struct snd_pcm *pcm;
2025         char new_name[64];
2026         int ret = 0, playback = 0, capture = 0;
2027
2028         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2029                 if (cpu_dai->driver->playback.channels_min)
2030                         playback = 1;
2031                 if (cpu_dai->driver->capture.channels_min)
2032                         capture = 1;
2033         } else {
2034                 if (codec_dai->driver->playback.channels_min &&
2035                     cpu_dai->driver->playback.channels_min)
2036                         playback = 1;
2037                 if (codec_dai->driver->capture.channels_min &&
2038                     cpu_dai->driver->capture.channels_min)
2039                         capture = 1;
2040         }
2041
2042         if (rtd->dai_link->playback_only) {
2043                 playback = 1;
2044                 capture = 0;
2045         }
2046
2047         if (rtd->dai_link->capture_only) {
2048                 playback = 0;
2049                 capture = 1;
2050         }
2051
2052         /* create the PCM */
2053         if (rtd->dai_link->no_pcm) {
2054                 snprintf(new_name, sizeof(new_name), "(%s)",
2055                         rtd->dai_link->stream_name);
2056
2057                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2058                                 playback, capture, &pcm);
2059         } else {
2060                 if (rtd->dai_link->dynamic)
2061                         snprintf(new_name, sizeof(new_name), "%s (*)",
2062                                 rtd->dai_link->stream_name);
2063                 else
2064                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2065                                 rtd->dai_link->stream_name, codec_dai->name, num);
2066
2067                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2068                         capture, &pcm);
2069         }
2070         if (ret < 0) {
2071                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2072                         rtd->dai_link->name);
2073                 return ret;
2074         }
2075         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2076
2077         /* DAPM dai link stream work */
2078         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2079
2080         rtd->pcm = pcm;
2081         pcm->private_data = rtd;
2082
2083         if (rtd->dai_link->no_pcm) {
2084                 if (playback)
2085                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2086                 if (capture)
2087                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2088                 goto out;
2089         }
2090
2091         /* ASoC PCM operations */
2092         if (rtd->dai_link->dynamic) {
2093                 rtd->ops.open           = dpcm_fe_dai_open;
2094                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2095                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2096                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2097                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2098                 rtd->ops.close          = dpcm_fe_dai_close;
2099                 rtd->ops.pointer        = soc_pcm_pointer;
2100                 rtd->ops.ioctl          = soc_pcm_ioctl;
2101         } else {
2102                 rtd->ops.open           = soc_pcm_open;
2103                 rtd->ops.hw_params      = soc_pcm_hw_params;
2104                 rtd->ops.prepare        = soc_pcm_prepare;
2105                 rtd->ops.trigger        = soc_pcm_trigger;
2106                 rtd->ops.hw_free        = soc_pcm_hw_free;
2107                 rtd->ops.close          = soc_pcm_close;
2108                 rtd->ops.pointer        = soc_pcm_pointer;
2109                 rtd->ops.ioctl          = soc_pcm_ioctl;
2110         }
2111
2112         if (platform->driver->ops) {
2113                 rtd->ops.ack            = platform->driver->ops->ack;
2114                 rtd->ops.copy           = platform->driver->ops->copy;
2115                 rtd->ops.silence        = platform->driver->ops->silence;
2116                 rtd->ops.page           = platform->driver->ops->page;
2117                 rtd->ops.mmap           = platform->driver->ops->mmap;
2118         }
2119
2120         if (playback)
2121                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2122
2123         if (capture)
2124                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2125
2126         if (platform->driver->pcm_new) {
2127                 ret = platform->driver->pcm_new(rtd);
2128                 if (ret < 0) {
2129                         dev_err(platform->dev,
2130                                 "ASoC: pcm constructor failed: %d\n",
2131                                 ret);
2132                         return ret;
2133                 }
2134         }
2135
2136         pcm->private_free = platform->driver->pcm_free;
2137 out:
2138         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n", codec_dai->name,
2139                 cpu_dai->name);
2140         return ret;
2141 }
2142
2143 /* is the current PCM operation for this FE ? */
2144 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2145 {
2146         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2147                 return 1;
2148         return 0;
2149 }
2150 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2151
2152 /* is the current PCM operation for this BE ? */
2153 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2154                 struct snd_soc_pcm_runtime *be, int stream)
2155 {
2156         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2157            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2158                   be->dpcm[stream].runtime_update))
2159                 return 1;
2160         return 0;
2161 }
2162 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2163
2164 /* get the substream for this BE */
2165 struct snd_pcm_substream *
2166         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2167 {
2168         return be->pcm->streams[stream].substream;
2169 }
2170 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2171
2172 /* get the BE runtime state */
2173 enum snd_soc_dpcm_state
2174         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2175 {
2176         return be->dpcm[stream].state;
2177 }
2178 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2179
2180 /* set the BE runtime state */
2181 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2182                 int stream, enum snd_soc_dpcm_state state)
2183 {
2184         be->dpcm[stream].state = state;
2185 }
2186 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2187
2188 /*
2189  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2190  * are not running, paused or suspended for the specified stream direction.
2191  */
2192 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2193                 struct snd_soc_pcm_runtime *be, int stream)
2194 {
2195         struct snd_soc_dpcm *dpcm;
2196         int state;
2197
2198         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2199
2200                 if (dpcm->fe == fe)
2201                         continue;
2202
2203                 state = dpcm->fe->dpcm[stream].state;
2204                 if (state == SND_SOC_DPCM_STATE_START ||
2205                         state == SND_SOC_DPCM_STATE_PAUSED ||
2206                         state == SND_SOC_DPCM_STATE_SUSPEND)
2207                         return 0;
2208         }
2209
2210         /* it's safe to free/stop this BE DAI */
2211         return 1;
2212 }
2213 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2214
2215 /*
2216  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2217  * running, paused or suspended for the specified stream direction.
2218  */
2219 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2220                 struct snd_soc_pcm_runtime *be, int stream)
2221 {
2222         struct snd_soc_dpcm *dpcm;
2223         int state;
2224
2225         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2226
2227                 if (dpcm->fe == fe)
2228                         continue;
2229
2230                 state = dpcm->fe->dpcm[stream].state;
2231                 if (state == SND_SOC_DPCM_STATE_START ||
2232                         state == SND_SOC_DPCM_STATE_PAUSED ||
2233                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2234                         state == SND_SOC_DPCM_STATE_PREPARE)
2235                         return 0;
2236         }
2237
2238         /* it's safe to change hw_params */
2239         return 1;
2240 }
2241 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2242
2243 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2244                 int cmd, struct snd_soc_platform *platform)
2245 {
2246         if (platform->driver->ops && platform->driver->ops->trigger)
2247                 return platform->driver->ops->trigger(substream, cmd);
2248         return 0;
2249 }
2250 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2251
2252 #ifdef CONFIG_DEBUG_FS
2253 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2254 {
2255         switch (state) {
2256         case SND_SOC_DPCM_STATE_NEW:
2257                 return "new";
2258         case SND_SOC_DPCM_STATE_OPEN:
2259                 return "open";
2260         case SND_SOC_DPCM_STATE_HW_PARAMS:
2261                 return "hw_params";
2262         case SND_SOC_DPCM_STATE_PREPARE:
2263                 return "prepare";
2264         case SND_SOC_DPCM_STATE_START:
2265                 return "start";
2266         case SND_SOC_DPCM_STATE_STOP:
2267                 return "stop";
2268         case SND_SOC_DPCM_STATE_SUSPEND:
2269                 return "suspend";
2270         case SND_SOC_DPCM_STATE_PAUSED:
2271                 return "paused";
2272         case SND_SOC_DPCM_STATE_HW_FREE:
2273                 return "hw_free";
2274         case SND_SOC_DPCM_STATE_CLOSE:
2275                 return "close";
2276         }
2277
2278         return "unknown";
2279 }
2280
2281 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2282                                 int stream, char *buf, size_t size)
2283 {
2284         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2285         struct snd_soc_dpcm *dpcm;
2286         ssize_t offset = 0;
2287
2288         /* FE state */
2289         offset += snprintf(buf + offset, size - offset,
2290                         "[%s - %s]\n", fe->dai_link->name,
2291                         stream ? "Capture" : "Playback");
2292
2293         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2294                         dpcm_state_string(fe->dpcm[stream].state));
2295
2296         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2297             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2298                 offset += snprintf(buf + offset, size - offset,
2299                                 "Hardware Params: "
2300                                 "Format = %s, Channels = %d, Rate = %d\n",
2301                                 snd_pcm_format_name(params_format(params)),
2302                                 params_channels(params),
2303                                 params_rate(params));
2304
2305         /* BEs state */
2306         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2307
2308         if (list_empty(&fe->dpcm[stream].be_clients)) {
2309                 offset += snprintf(buf + offset, size - offset,
2310                                 " No active DSP links\n");
2311                 goto out;
2312         }
2313
2314         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2315                 struct snd_soc_pcm_runtime *be = dpcm->be;
2316                 params = &dpcm->hw_params;
2317
2318                 offset += snprintf(buf + offset, size - offset,
2319                                 "- %s\n", be->dai_link->name);
2320
2321                 offset += snprintf(buf + offset, size - offset,
2322                                 "   State: %s\n",
2323                                 dpcm_state_string(be->dpcm[stream].state));
2324
2325                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2326                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2327                         offset += snprintf(buf + offset, size - offset,
2328                                 "   Hardware Params: "
2329                                 "Format = %s, Channels = %d, Rate = %d\n",
2330                                 snd_pcm_format_name(params_format(params)),
2331                                 params_channels(params),
2332                                 params_rate(params));
2333         }
2334
2335 out:
2336         return offset;
2337 }
2338
2339 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2340                                 size_t count, loff_t *ppos)
2341 {
2342         struct snd_soc_pcm_runtime *fe = file->private_data;
2343         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2344         char *buf;
2345
2346         buf = kmalloc(out_count, GFP_KERNEL);
2347         if (!buf)
2348                 return -ENOMEM;
2349
2350         if (fe->cpu_dai->driver->playback.channels_min)
2351                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2352                                         buf + offset, out_count - offset);
2353
2354         if (fe->cpu_dai->driver->capture.channels_min)
2355                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2356                                         buf + offset, out_count - offset);
2357
2358         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2359
2360         kfree(buf);
2361         return ret;
2362 }
2363
2364 static const struct file_operations dpcm_state_fops = {
2365         .open = simple_open,
2366         .read = dpcm_state_read_file,
2367         .llseek = default_llseek,
2368 };
2369
2370 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2371 {
2372         if (!rtd->dai_link)
2373                 return 0;
2374
2375         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2376                         rtd->card->debugfs_card_root);
2377         if (!rtd->debugfs_dpcm_root) {
2378                 dev_dbg(rtd->dev,
2379                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2380                          rtd->dai_link->name);
2381                 return -EINVAL;
2382         }
2383
2384         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2385                                                 rtd->debugfs_dpcm_root,
2386                                                 rtd, &dpcm_state_fops);
2387
2388         return 0;
2389 }
2390 #endif