Pileus Git - ~andy/linux/blob - 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 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->rate && (soc_dai->driver->symmetric_rates ||
  88                                 rtd->dai_link->symmetric_rates)) {
  89                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
  90                                 soc_dai->rate);
  91
  92                 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
  93                                                 SNDRV_PCM_HW_PARAM_RATE,
  94                                                 soc_dai->rate, soc_dai->rate);
  95                 if (ret < 0) {
  96                         dev_err(soc_dai->dev,
  97                                 "ASoC: Unable to apply rate constraint: %d\n",
  98                                 ret);
  99                         return ret;
 100                 }
 101         }
 102
 103         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
 104                                 rtd->dai_link->symmetric_channels)) {
 105                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
 106                                 soc_dai->channels);
 107
 108                 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 109                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
 110                                                 soc_dai->channels,
 111                                                 soc_dai->channels);
 112                 if (ret < 0) {
 113                         dev_err(soc_dai->dev,
 114                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
 115                                 ret);
 116                         return ret;
 117                 }
 118         }
 119
 120         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
 121                                 rtd->dai_link->symmetric_samplebits)) {
 122                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
 123                                 soc_dai->sample_bits);
 124
 125                 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 126                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
 127                                                 soc_dai->sample_bits,
 128                                                 soc_dai->sample_bits);
 129                 if (ret < 0) {
 130                         dev_err(soc_dai->dev,
 131                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
 132                                 ret);
 133                         return ret;
 134                 }
 135         }
 136
 137         return 0;
 138 }
 139
 140 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 141                                 struct snd_pcm_hw_params *params)
 142 {
 143         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 144         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 145         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 146         unsigned int rate, channels, sample_bits, symmetry;
 147
 148         rate = params_rate(params);
 149         channels = params_channels(params);
 150         sample_bits = snd_pcm_format_physical_width(params_format(params));
 151
 152         /* reject unmatched parameters when applying symmetry */
 153         symmetry = cpu_dai->driver->symmetric_rates ||
 154                 codec_dai->driver->symmetric_rates ||
 155                 rtd->dai_link->symmetric_rates;
 156         if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
 157                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
 158                                 cpu_dai->rate, rate);
 159                 return -EINVAL;
 160         }
 161
 162         symmetry = cpu_dai->driver->symmetric_channels ||
 163                 codec_dai->driver->symmetric_channels ||
 164                 rtd->dai_link->symmetric_channels;
 165         if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
 166                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
 167                                 cpu_dai->channels, channels);
 168                 return -EINVAL;
 169         }
 170
 171         symmetry = cpu_dai->driver->symmetric_samplebits ||
 172                 codec_dai->driver->symmetric_samplebits ||
 173                 rtd->dai_link->symmetric_samplebits;
 174         if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
 175                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
 176                                 cpu_dai->sample_bits, sample_bits);
 177                 return -EINVAL;
 178         }
 179
 180         return 0;
 181 }
 182
 183 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
 184 {
 185         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 186         struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
 187         struct snd_soc_dai_driver *codec_driver = rtd->codec_dai->driver;
 188         struct snd_soc_dai_link *link = rtd->dai_link;
 189
 190         return cpu_driver->symmetric_rates || codec_driver->symmetric_rates ||
 191                 link->symmetric_rates || cpu_driver->symmetric_channels ||
 192                 codec_driver->symmetric_channels || link->symmetric_channels ||
 193                 cpu_driver->symmetric_samplebits ||
 194                 codec_driver->symmetric_samplebits ||
 195                 link->symmetric_samplebits;
 196 }
 197
 198 /*
 199  * List of sample sizes that might go over the bus for parameter
 200  * application.  There ought to be a wildcard sample size for things
 201  * like the DAC/ADC resolution to use but there isn't right now.
 202  */
 203 static int sample_sizes[] = {
 204         24, 32,
 205 };
 206
 207 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
 208                               struct snd_soc_dai *dai)
 209 {
 210         int ret, i, bits;
 211
 212         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 213                 bits = dai->driver->playback.sig_bits;
 214         else
 215                 bits = dai->driver->capture.sig_bits;
 216
 217         if (!bits)
 218                 return;
 219
 220         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
 221                 if (bits >= sample_sizes[i])
 222                         continue;
 223
 224                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
 225                                                    sample_sizes[i], bits);
 226                 if (ret != 0)
 227                         dev_warn(dai->dev,
 228                                  "ASoC: Failed to set MSB %d/%d: %d\n",
 229                                  bits, sample_sizes[i], ret);
 230         }
 231 }
 232
 233 static void soc_pcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
 234         struct snd_soc_pcm_stream *codec_stream,
 235         struct snd_soc_pcm_stream *cpu_stream)
 236 {
 237         struct snd_pcm_hardware *hw = &runtime->hw;
 238
 239         hw->channels_min = max(codec_stream->channels_min,
 240                 cpu_stream->channels_min);
 241         hw->channels_max = min(codec_stream->channels_max,
 242                 cpu_stream->channels_max);
 243         if (hw->formats)
 244                 hw->formats &= codec_stream->formats & cpu_stream->formats;
 245         else
 246                 hw->formats = codec_stream->formats & cpu_stream->formats;
 247         hw->rates = snd_pcm_rate_mask_intersect(codec_stream->rates,
 248                 cpu_stream->rates);
 249
 250         hw->rate_min = 0;
 251         hw->rate_max = UINT_MAX;
 252
 253         snd_pcm_limit_hw_rates(runtime);
 254
 255         hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
 256         hw->rate_min = max(hw->rate_min, codec_stream->rate_min);
 257         hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
 258         hw->rate_max = min_not_zero(hw->rate_max, codec_stream->rate_max);
 259 }
 260
 261 /*
 262  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 263  * then initialized and any private data can be allocated. This also calls
 264  * startup for the cpu DAI, platform, machine and codec DAI.
 265  */
 266 static int soc_pcm_open(struct snd_pcm_substream *substream)
 267 {
 268         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 269         struct snd_pcm_runtime *runtime = substream->runtime;
 270         struct snd_soc_platform *platform = rtd->platform;
 271         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 272         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 273         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
 274         struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
 275         int ret = 0;
 276
 277         pinctrl_pm_select_default_state(cpu_dai->dev);
 278         pinctrl_pm_select_default_state(codec_dai->dev);
 279         pm_runtime_get_sync(cpu_dai->dev);
 280         pm_runtime_get_sync(codec_dai->dev);
 281         pm_runtime_get_sync(platform->dev);
 282
 283         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 284
 285         /* startup the audio subsystem */
 286         if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
 287                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 288                 if (ret < 0) {
 289                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 290                                 " %s: %d\n", cpu_dai->name, ret);
 291                         goto out;
 292                 }
 293         }
 294
 295         if (platform->driver->ops && platform->driver->ops->open) {
 296                 ret = platform->driver->ops->open(substream);
 297                 if (ret < 0) {
 298                         dev_err(platform->dev, "ASoC: can't open platform"
 299                                 " %s: %d\n", platform->name, ret);
 300                         goto platform_err;
 301                 }
 302         }
 303
 304         if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
 305                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
 306                 if (ret < 0) {
 307                         dev_err(codec_dai->dev, "ASoC: can't open codec"
 308                                 " %s: %d\n", codec_dai->name, ret);
 309                         goto codec_dai_err;
 310                 }
 311         }
 312
 313         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 314                 ret = rtd->dai_link->ops->startup(substream);
 315                 if (ret < 0) {
 316                         pr_err("ASoC: %s startup failed: %d\n",
 317                                rtd->dai_link->name, ret);
 318                         goto machine_err;
 319                 }
 320         }
 321
 322         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 323         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 324                 goto dynamic;
 325
 326         /* Check that the codec and cpu DAIs are compatible */
 327         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 328                 soc_pcm_init_runtime_hw(runtime, &codec_dai_drv->playback,
 329                         &cpu_dai_drv->playback);
 330         } else {
 331                 soc_pcm_init_runtime_hw(runtime, &codec_dai_drv->capture,
 332                         &cpu_dai_drv->capture);
 333         }
 334
 335         if (soc_pcm_has_symmetry(substream))
 336                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 337
 338         ret = -EINVAL;
 339         if (!runtime->hw.rates) {
 340                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 341                         codec_dai->name, cpu_dai->name);
 342                 goto config_err;
 343         }
 344         if (!runtime->hw.formats) {
 345                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 346                         codec_dai->name, cpu_dai->name);
 347                 goto config_err;
 348         }
 349         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 350             runtime->hw.channels_min > runtime->hw.channels_max) {
 351                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 352                                 codec_dai->name, cpu_dai->name);
 353                 goto config_err;
 354         }
 355
 356         soc_pcm_apply_msb(substream, codec_dai);
 357         soc_pcm_apply_msb(substream, cpu_dai);
 358
 359         /* Symmetry only applies if we've already got an active stream. */
 360         if (cpu_dai->active) {
 361                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 362                 if (ret != 0)
 363                         goto config_err;
 364         }
 365
 366         if (codec_dai->active) {
 367                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
 368                 if (ret != 0)
 369                         goto config_err;
 370         }
 371
 372         pr_debug("ASoC: %s <-> %s info:\n",
 373                         codec_dai->name, cpu_dai->name);
 374         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 375         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 376                  runtime->hw.channels_max);
 377         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 378                  runtime->hw.rate_max);
 379
 380 dynamic:
 381         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 382                 cpu_dai->playback_active++;
 383                 codec_dai->playback_active++;
 384         } else {
 385                 cpu_dai->capture_active++;
 386                 codec_dai->capture_active++;
 387         }
 388         cpu_dai->active++;
 389         codec_dai->active++;
 390         rtd->codec->active++;
 391         mutex_unlock(&rtd->pcm_mutex);
 392         return 0;
 393
 394 config_err:
 395         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 396                 rtd->dai_link->ops->shutdown(substream);
 397
 398 machine_err:
 399         if (codec_dai->driver->ops->shutdown)
 400                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 401
 402 codec_dai_err:
 403         if (platform->driver->ops && platform->driver->ops->close)
 404                 platform->driver->ops->close(substream);
 405
 406 platform_err:
 407         if (cpu_dai->driver->ops->shutdown)
 408                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 409 out:
 410         mutex_unlock(&rtd->pcm_mutex);
 411
 412         pm_runtime_put(platform->dev);
 413         pm_runtime_put(codec_dai->dev);
 414         pm_runtime_put(cpu_dai->dev);
 415         if (!codec_dai->active)
 416                 pinctrl_pm_select_sleep_state(codec_dai->dev);
 417         if (!cpu_dai->active)
 418                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 419
 420         return ret;
 421 }
 422
 423 /*
 424  * Power down the audio subsystem pmdown_time msecs after close is called.
 425  * This is to ensure there are no pops or clicks in between any music tracks
 426  * due to DAPM power cycling.
 427  */
 428 static void close_delayed_work(struct work_struct *work)
 429 {
 430         struct snd_soc_pcm_runtime *rtd =
 431                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 432         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 433
 434         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 435
 436         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 437                  codec_dai->driver->playback.stream_name,
 438                  codec_dai->playback_active ? "active" : "inactive",
 439                  rtd->pop_wait ? "yes" : "no");
 440
 441         /* are we waiting on this codec DAI stream */
 442         if (rtd->pop_wait == 1) {
 443                 rtd->pop_wait = 0;
 444                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 445                                           SND_SOC_DAPM_STREAM_STOP);
 446         }
 447
 448         mutex_unlock(&rtd->pcm_mutex);
 449 }
 450
 451 /*
 452  * Called by ALSA when a PCM substream is closed. Private data can be
 453  * freed here. The cpu DAI, codec DAI, machine and platform are also
 454  * shutdown.
 455  */
 456 static int soc_pcm_close(struct snd_pcm_substream *substream)
 457 {
 458         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 459         struct snd_soc_platform *platform = rtd->platform;
 460         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 461         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 462         struct snd_soc_codec *codec = rtd->codec;
 463
 464         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 465
 466         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 467                 cpu_dai->playback_active--;
 468                 codec_dai->playback_active--;
 469         } else {
 470                 cpu_dai->capture_active--;
 471                 codec_dai->capture_active--;
 472         }
 473
 474         cpu_dai->active--;
 475         codec_dai->active--;
 476         codec->active--;
 477
 478         /* clear the corresponding DAIs rate when inactive */
 479         if (!cpu_dai->active)
 480                 cpu_dai->rate = 0;
 481
 482         if (!codec_dai->active)
 483                 codec_dai->rate = 0;
 484
 485         if (cpu_dai->driver->ops->shutdown)
 486                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 487
 488         if (codec_dai->driver->ops->shutdown)
 489                 codec_dai->driver->ops->shutdown(substream, codec_dai);
 490
 491         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 492                 rtd->dai_link->ops->shutdown(substream);
 493
 494         if (platform->driver->ops && platform->driver->ops->close)
 495                 platform->driver->ops->close(substream);
 496         cpu_dai->runtime = NULL;
 497
 498         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 499                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 500                     rtd->dai_link->ignore_pmdown_time) {
 501                         /* powered down playback stream now */
 502                         snd_soc_dapm_stream_event(rtd,
 503                                                   SNDRV_PCM_STREAM_PLAYBACK,
 504                                                   SND_SOC_DAPM_STREAM_STOP);
 505                 } else {
 506                         /* start delayed pop wq here for playback streams */
 507                         rtd->pop_wait = 1;
 508                         queue_delayed_work(system_power_efficient_wq,
 509                                            &rtd->delayed_work,
 510                                            msecs_to_jiffies(rtd->pmdown_time));
 511                 }
 512         } else {
 513                 /* capture streams can be powered down now */
 514                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 515                                           SND_SOC_DAPM_STREAM_STOP);
 516         }
 517
 518         mutex_unlock(&rtd->pcm_mutex);
 519
 520         pm_runtime_put(platform->dev);
 521         pm_runtime_put(codec_dai->dev);
 522         pm_runtime_put(cpu_dai->dev);
 523         if (!codec_dai->active)
 524                 pinctrl_pm_select_sleep_state(codec_dai->dev);
 525         if (!cpu_dai->active)
 526                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 527
 528         return 0;
 529 }
 530
 531 /*
 532  * Called by ALSA when the PCM substream is prepared, can set format, sample
 533  * rate, etc.  This function is non atomic and can be called multiple times,
 534  * it can refer to the runtime info.
 535  */
 536 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 537 {
 538         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 539         struct snd_soc_platform *platform = rtd->platform;
 540         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 541         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 542         int ret = 0;
 543
 544         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 545
 546         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 547                 ret = rtd->dai_link->ops->prepare(substream);
 548                 if (ret < 0) {
 549                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 550                                 " %d\n", ret);
 551                         goto out;
 552                 }
 553         }
 554
 555         if (platform->driver->ops && platform->driver->ops->prepare) {
 556                 ret = platform->driver->ops->prepare(substream);
 557                 if (ret < 0) {
 558                         dev_err(platform->dev, "ASoC: platform prepare error:"
 559                                 " %d\n", ret);
 560                         goto out;
 561                 }
 562         }
 563
 564         if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
 565                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
 566                 if (ret < 0) {
 567                         dev_err(codec_dai->dev, "ASoC: DAI prepare error: %d\n",
 568                                 ret);
 569                         goto out;
 570                 }
 571         }
 572
 573         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 574                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 575                 if (ret < 0) {
 576                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
 577                                 ret);
 578                         goto out;
 579                 }
 580         }
 581
 582         /* cancel any delayed stream shutdown that is pending */
 583         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 584             rtd->pop_wait) {
 585                 rtd->pop_wait = 0;
 586                 cancel_delayed_work(&rtd->delayed_work);
 587         }
 588
 589         snd_soc_dapm_stream_event(rtd, substream->stream,
 590                         SND_SOC_DAPM_STREAM_START);
 591
 592         snd_soc_dai_digital_mute(codec_dai, 0, substream->stream);
 593
 594 out:
 595         mutex_unlock(&rtd->pcm_mutex);
 596         return ret;
 597 }
 598
 599 /*
 600  * Called by ALSA when the hardware params are set by application. This
 601  * function can also be called multiple times and can allocate buffers
 602  * (using snd_pcm_lib_* ). It's non-atomic.
 603  */
 604 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 605                                 struct snd_pcm_hw_params *params)
 606 {
 607         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 608         struct snd_soc_platform *platform = rtd->platform;
 609         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 610         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 611         int ret = 0;
 612
 613         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 614
 615         ret = soc_pcm_params_symmetry(substream, params);
 616         if (ret)
 617                 goto out;
 618
 619         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 620                 ret = rtd->dai_link->ops->hw_params(substream, params);
 621                 if (ret < 0) {
 622                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 623                                 " failed: %d\n", ret);
 624                         goto out;
 625                 }
 626         }
 627
 628         if (codec_dai->driver->ops && codec_dai->driver->ops->hw_params) {
 629                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
 630                 if (ret < 0) {
 631                         dev_err(codec_dai->dev, "ASoC: can't set %s hw params:"
 632                                 " %d\n", codec_dai->name, ret);
 633                         goto codec_err;
 634                 }
 635         }
 636
 637         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_params) {
 638                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
 639                 if (ret < 0) {
 640                         dev_err(cpu_dai->dev, "ASoC: %s hw params failed: %d\n",
 641                                 cpu_dai->name, ret);
 642                         goto interface_err;
 643                 }
 644         }
 645
 646         if (platform->driver->ops && platform->driver->ops->hw_params) {
 647                 ret = platform->driver->ops->hw_params(substream, params);
 648                 if (ret < 0) {
 649                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 650                                platform->name, ret);
 651                         goto platform_err;
 652                 }
 653         }
 654
 655         /* store the parameters for each DAIs */
 656         cpu_dai->rate = params_rate(params);
 657         cpu_dai->channels = params_channels(params);
 658         cpu_dai->sample_bits =
 659                 snd_pcm_format_physical_width(params_format(params));
 660
 661         codec_dai->rate = params_rate(params);
 662         codec_dai->channels = params_channels(params);
 663         codec_dai->sample_bits =
 664                 snd_pcm_format_physical_width(params_format(params));
 665
 666 out:
 667         mutex_unlock(&rtd->pcm_mutex);
 668         return ret;
 669
 670 platform_err:
 671         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 672                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 673
 674 interface_err:
 675         if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 676                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 677
 678 codec_err:
 679         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 680                 rtd->dai_link->ops->hw_free(substream);
 681
 682         mutex_unlock(&rtd->pcm_mutex);
 683         return ret;
 684 }
 685
 686 /*
 687  * Frees resources allocated by hw_params, can be called multiple times
 688  */
 689 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 690 {
 691         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 692         struct snd_soc_platform *platform = rtd->platform;
 693         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 694         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 695         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 696
 697         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 698
 699         /* clear the corresponding DAIs parameters when going to be inactive */
 700         if (cpu_dai->active == 1) {
 701                 cpu_dai->rate = 0;
 702                 cpu_dai->channels = 0;
 703                 cpu_dai->sample_bits = 0;
 704         }
 705
 706         if (codec_dai->active == 1) {
 707                 codec_dai->rate = 0;
 708                 codec_dai->channels = 0;
 709                 codec_dai->sample_bits = 0;
 710         }
 711
 712         /* apply codec digital mute */
 713         if ((playback && codec_dai->playback_active == 1) ||
 714             (!playback && codec_dai->capture_active == 1))
 715                 snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
 716
 717         /* free any machine hw params */
 718         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 719                 rtd->dai_link->ops->hw_free(substream);
 720
 721         /* free any DMA resources */
 722         if (platform->driver->ops && platform->driver->ops->hw_free)
 723                 platform->driver->ops->hw_free(substream);
 724
 725         /* now free hw params for the DAIs  */
 726         if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 727                 codec_dai->driver->ops->hw_free(substream, codec_dai);
 728
 729         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 730                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 731
 732         mutex_unlock(&rtd->pcm_mutex);
 733         return 0;
 734 }
 735
 736 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 737 {
 738         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 739         struct snd_soc_platform *platform = rtd->platform;
 740         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 741         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 742         int ret;
 743
 744         if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
 745                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
 746                 if (ret < 0)
 747                         return ret;
 748         }
 749
 750         if (platform->driver->ops && platform->driver->ops->trigger) {
 751                 ret = platform->driver->ops->trigger(substream, cmd);
 752                 if (ret < 0)
 753                         return ret;
 754         }
 755
 756         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
 757                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 758                 if (ret < 0)
 759                         return ret;
 760         }
 761         return 0;
 762 }
 763
 764 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
 765                                    int cmd)
 766 {
 767         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 768         struct snd_soc_platform *platform = rtd->platform;
 769         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 770         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 771         int ret;
 772
 773         if (codec_dai->driver->ops &&
 774             codec_dai->driver->ops->bespoke_trigger) {
 775                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
 776                 if (ret < 0)
 777                         return ret;
 778         }
 779
 780         if (platform->driver->bespoke_trigger) {
 781                 ret = platform->driver->bespoke_trigger(substream, cmd);
 782                 if (ret < 0)
 783                         return ret;
 784         }
 785
 786         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
 787                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
 788                 if (ret < 0)
 789                         return ret;
 790         }
 791         return 0;
 792 }
 793 /*
 794  * soc level wrapper for pointer callback
 795  * If cpu_dai, codec_dai, platform driver has the delay callback, than
 796  * the runtime->delay will be updated accordingly.
 797  */
 798 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 799 {
 800         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 801         struct snd_soc_platform *platform = rtd->platform;
 802         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 803         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 804         struct snd_pcm_runtime *runtime = substream->runtime;
 805         snd_pcm_uframes_t offset = 0;
 806         snd_pcm_sframes_t delay = 0;
 807
 808         if (platform->driver->ops && platform->driver->ops->pointer)
 809                 offset = platform->driver->ops->pointer(substream);
 810
 811         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
 812                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
 813
 814         if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
 815                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
 816
 817         if (platform->driver->delay)
 818                 delay += platform->driver->delay(substream, codec_dai);
 819
 820         runtime->delay = delay;
 821
 822         return offset;
 823 }
 824
 825 /* connect a FE and BE */
 826 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
 827                 struct snd_soc_pcm_runtime *be, int stream)
 828 {
 829         struct snd_soc_dpcm *dpcm;
 830
 831         /* only add new dpcms */
 832         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
 833                 if (dpcm->be == be && dpcm->fe == fe)
 834                         return 0;
 835         }
 836
 837         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
 838         if (!dpcm)
 839                 return -ENOMEM;
 840
 841         dpcm->be = be;
 842         dpcm->fe = fe;
 843         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
 844         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
 845         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
 846         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
 847
 848         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
 849                         stream ? "capture" : "playback",  fe->dai_link->name,
 850                         stream ? "<-" : "->", be->dai_link->name);
 851
 852 #ifdef CONFIG_DEBUG_FS
 853         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
 854                         fe->debugfs_dpcm_root, &dpcm->state);
 855 #endif
 856         return 1;
 857 }
 858
 859 /* reparent a BE onto another FE */
 860 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
 861                         struct snd_soc_pcm_runtime *be, int stream)
 862 {
 863         struct snd_soc_dpcm *dpcm;
 864         struct snd_pcm_substream *fe_substream, *be_substream;
 865
 866         /* reparent if BE is connected to other FEs */
 867         if (!be->dpcm[stream].users)
 868                 return;
 869
 870         be_substream = snd_soc_dpcm_get_substream(be, stream);
 871
 872         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
 873                 if (dpcm->fe == fe)
 874                         continue;
 875
 876                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
 877                         stream ? "capture" : "playback",
 878                         dpcm->fe->dai_link->name,
 879                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 880
 881                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
 882                 be_substream->runtime = fe_substream->runtime;
 883                 break;
 884         }
 885 }
 886
 887 /* disconnect a BE and FE */
 888 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
 889 {
 890         struct snd_soc_dpcm *dpcm, *d;
 891
 892         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
 893                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
 894                                 stream ? "capture" : "playback",
 895                                 dpcm->be->dai_link->name);
 896
 897                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
 898                         continue;
 899
 900                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
 901                         stream ? "capture" : "playback", fe->dai_link->name,
 902                         stream ? "<-" : "->", dpcm->be->dai_link->name);
 903
 904                 /* BEs still alive need new FE */
 905                 dpcm_be_reparent(fe, dpcm->be, stream);
 906
 907 #ifdef CONFIG_DEBUG_FS
 908                 debugfs_remove(dpcm->debugfs_state);
 909 #endif
 910                 list_del(&dpcm->list_be);
 911                 list_del(&dpcm->list_fe);
 912                 kfree(dpcm);
 913         }
 914 }
 915
 916 /* get BE for DAI widget and stream */
 917 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
 918                 struct snd_soc_dapm_widget *widget, int stream)
 919 {
 920         struct snd_soc_pcm_runtime *be;
 921         int i;
 922
 923         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 924                 for (i = 0; i < card->num_links; i++) {
 925                         be = &card->rtd[i];
 926
 927                         if (!be->dai_link->no_pcm)
 928                                 continue;
 929
 930                         if (be->cpu_dai->playback_widget == widget ||
 931                                 be->codec_dai->playback_widget == widget)
 932                                 return be;
 933                 }
 934         } else {
 935
 936                 for (i = 0; i < card->num_links; i++) {
 937                         be = &card->rtd[i];
 938
 939                         if (!be->dai_link->no_pcm)
 940                                 continue;
 941
 942                         if (be->cpu_dai->capture_widget == widget ||
 943                                 be->codec_dai->capture_widget == widget)
 944                                 return be;
 945                 }
 946         }
 947
 948         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
 949                 stream ? "capture" : "playback", widget->name);
 950         return NULL;
 951 }
 952
 953 static inline struct snd_soc_dapm_widget *
 954         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 955 {
 956         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 957                 return rtd->cpu_dai->playback_widget;
 958         else
 959                 return rtd->cpu_dai->capture_widget;
 960 }
 961
 962 static inline struct snd_soc_dapm_widget *
 963         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
 964 {
 965         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 966                 return rtd->codec_dai->playback_widget;
 967         else
 968                 return rtd->codec_dai->capture_widget;
 969 }
 970
 971 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 972                 struct snd_soc_dapm_widget *widget)
 973 {
 974         int i;
 975
 976         for (i = 0; i < list->num_widgets; i++) {
 977                 if (widget == list->widgets[i])
 978                         return 1;
 979         }
 980
 981         return 0;
 982 }
 983
 984 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 985         int stream, struct snd_soc_dapm_widget_list **list_)
 986 {
 987         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
 988         struct snd_soc_dapm_widget_list *list;
 989         int paths;
 990
 991         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
 992                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
 993         if (list == NULL)
 994                 return -ENOMEM;
 995
 996         /* get number of valid DAI paths and their widgets */
 997         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
 998
 999         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1000                         stream ? "capture" : "playback");
1001
1002         *list_ = list;
1003         return paths;
1004 }
1005
1006 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1007         struct snd_soc_dapm_widget_list **list_)
1008 {
1009         struct snd_soc_dpcm *dpcm;
1010         struct snd_soc_dapm_widget_list *list = *list_;
1011         struct snd_soc_dapm_widget *widget;
1012         int prune = 0;
1013
1014         /* Destroy any old FE <--> BE connections */
1015         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1016
1017                 /* is there a valid CPU DAI widget for this BE */
1018                 widget = rtd_get_cpu_widget(dpcm->be, stream);
1019
1020                 /* prune the BE if it's no longer in our active list */
1021                 if (widget && widget_in_list(list, widget))
1022                         continue;
1023
1024                 /* is there a valid CODEC DAI widget for this BE */
1025                 widget = rtd_get_codec_widget(dpcm->be, stream);
1026
1027                 /* prune the BE if it's no longer in our active list */
1028                 if (widget && widget_in_list(list, widget))
1029                         continue;
1030
1031                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1032                         stream ? "capture" : "playback",
1033                         dpcm->be->dai_link->name, fe->dai_link->name);
1034                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1035                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1036                 prune++;
1037         }
1038
1039         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1040         return prune;
1041 }
1042
1043 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1044         struct snd_soc_dapm_widget_list **list_)
1045 {
1046         struct snd_soc_card *card = fe->card;
1047         struct snd_soc_dapm_widget_list *list = *list_;
1048         struct snd_soc_pcm_runtime *be;
1049         int i, new = 0, err;
1050
1051         /* Create any new FE <--> BE connections */
1052         for (i = 0; i < list->num_widgets; i++) {
1053
1054                 switch (list->widgets[i]->id) {
1055                 case snd_soc_dapm_dai_in:
1056                 case snd_soc_dapm_dai_out:
1057                         break;
1058                 default:
1059                         continue;
1060                 }
1061
1062                 /* is there a valid BE rtd for this widget */
1063                 be = dpcm_get_be(card, list->widgets[i], stream);
1064                 if (!be) {
1065                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1066                                         list->widgets[i]->name);
1067                         continue;
1068                 }
1069
1070                 /* make sure BE is a real BE */
1071                 if (!be->dai_link->no_pcm)
1072                         continue;
1073
1074                 /* don't connect if FE is not running */
1075                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1076                         continue;
1077
1078                 /* newly connected FE and BE */
1079                 err = dpcm_be_connect(fe, be, stream);
1080                 if (err < 0) {
1081                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1082                                 list->widgets[i]->name);
1083                         break;
1084                 } else if (err == 0) /* already connected */
1085                         continue;
1086
1087                 /* new */
1088                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1089                 new++;
1090         }
1091
1092         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1093         return new;
1094 }
1095
1096 /*
1097  * Find the corresponding BE DAIs that source or sink audio to this
1098  * FE substream.
1099  */
1100 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1101         int stream, struct snd_soc_dapm_widget_list **list, int new)
1102 {
1103         if (new)
1104                 return dpcm_add_paths(fe, stream, list);
1105         else
1106                 return dpcm_prune_paths(fe, stream, list);
1107 }
1108
1109 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1110 {
1111         struct snd_soc_dpcm *dpcm;
1112
1113         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1114                 dpcm->be->dpcm[stream].runtime_update =
1115                                                 SND_SOC_DPCM_UPDATE_NO;
1116 }
1117
1118 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1119         int stream)
1120 {
1121         struct snd_soc_dpcm *dpcm;
1122
1123         /* disable any enabled and non active backends */
1124         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1125
1126                 struct snd_soc_pcm_runtime *be = dpcm->be;
1127                 struct snd_pcm_substream *be_substream =
1128                         snd_soc_dpcm_get_substream(be, stream);
1129
1130                 if (be->dpcm[stream].users == 0)
1131                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1132                                 stream ? "capture" : "playback",
1133                                 be->dpcm[stream].state);
1134
1135                 if (--be->dpcm[stream].users != 0)
1136                         continue;
1137
1138                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1139                         continue;
1140
1141                 soc_pcm_close(be_substream);
1142                 be_substream->runtime = NULL;
1143                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1144         }
1145 }
1146
1147 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1148 {
1149         struct snd_soc_dpcm *dpcm;
1150         int err, count = 0;
1151
1152         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1153         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1154
1155                 struct snd_soc_pcm_runtime *be = dpcm->be;
1156                 struct snd_pcm_substream *be_substream =
1157                         snd_soc_dpcm_get_substream(be, stream);
1158
1159                 if (!be_substream) {
1160                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1161                                 stream ? "capture" : "playback");
1162                         continue;
1163                 }
1164
1165                 /* is this op for this BE ? */
1166                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1167                         continue;
1168
1169                 /* first time the dpcm is open ? */
1170                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1171                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1172                                 stream ? "capture" : "playback",
1173                                 be->dpcm[stream].state);
1174
1175                 if (be->dpcm[stream].users++ != 0)
1176                         continue;
1177
1178                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1179                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1180                         continue;
1181
1182                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1183                         stream ? "capture" : "playback", be->dai_link->name);
1184
1185                 be_substream->runtime = be->dpcm[stream].runtime;
1186                 err = soc_pcm_open(be_substream);
1187                 if (err < 0) {
1188                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1189                         be->dpcm[stream].users--;
1190                         if (be->dpcm[stream].users < 0)
1191                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1192                                         stream ? "capture" : "playback",
1193                                         be->dpcm[stream].state);
1194
1195                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1196                         goto unwind;
1197                 }
1198
1199                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1200                 count++;
1201         }
1202
1203         return count;
1204
1205 unwind:
1206         /* disable any enabled and non active backends */
1207         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1208                 struct snd_soc_pcm_runtime *be = dpcm->be;
1209                 struct snd_pcm_substream *be_substream =
1210                         snd_soc_dpcm_get_substream(be, stream);
1211
1212                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1213                         continue;
1214
1215                 if (be->dpcm[stream].users == 0)
1216                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1217                                 stream ? "capture" : "playback",
1218                                 be->dpcm[stream].state);
1219
1220                 if (--be->dpcm[stream].users != 0)
1221                         continue;
1222
1223                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1224                         continue;
1225
1226                 soc_pcm_close(be_substream);
1227                 be_substream->runtime = NULL;
1228                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1229         }
1230
1231         return err;
1232 }
1233
1234 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1235         struct snd_soc_pcm_stream *stream)
1236 {
1237         runtime->hw.rate_min = stream->rate_min;
1238         runtime->hw.rate_max = stream->rate_max;
1239         runtime->hw.channels_min = stream->channels_min;
1240         runtime->hw.channels_max = stream->channels_max;
1241         if (runtime->hw.formats)
1242                 runtime->hw.formats &= stream->formats;
1243         else
1244                 runtime->hw.formats = stream->formats;
1245         runtime->hw.rates = stream->rates;
1246 }
1247
1248 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1249 {
1250         struct snd_pcm_runtime *runtime = substream->runtime;
1251         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1252         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1253         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1254
1255         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1256                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback);
1257         else
1258                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture);
1259 }
1260
1261 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1262 {
1263         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1264         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1265         int stream = fe_substream->stream, ret = 0;
1266
1267         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1268
1269         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1270         if (ret < 0) {
1271                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1272                 goto be_err;
1273         }
1274
1275         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1276
1277         /* start the DAI frontend */
1278         ret = soc_pcm_open(fe_substream);
1279         if (ret < 0) {
1280                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1281                 goto unwind;
1282         }
1283
1284         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1285
1286         dpcm_set_fe_runtime(fe_substream);
1287         snd_pcm_limit_hw_rates(runtime);
1288
1289         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1290         return 0;
1291
1292 unwind:
1293         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1294 be_err:
1295         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1296         return ret;
1297 }
1298
1299 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1300 {
1301         struct snd_soc_dpcm *dpcm;
1302
1303         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1304         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1305
1306                 struct snd_soc_pcm_runtime *be = dpcm->be;
1307                 struct snd_pcm_substream *be_substream =
1308                         snd_soc_dpcm_get_substream(be, stream);
1309
1310                 /* is this op for this BE ? */
1311                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1312                         continue;
1313
1314                 if (be->dpcm[stream].users == 0)
1315                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1316                                 stream ? "capture" : "playback",
1317                                 be->dpcm[stream].state);
1318
1319                 if (--be->dpcm[stream].users != 0)
1320                         continue;
1321
1322                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1323                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1324                         continue;
1325
1326                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1327                         dpcm->fe->dai_link->name);
1328
1329                 soc_pcm_close(be_substream);
1330                 be_substream->runtime = NULL;
1331
1332                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1333         }
1334         return 0;
1335 }
1336
1337 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1338 {
1339         struct snd_soc_pcm_runtime *fe = substream->private_data;
1340         int stream = substream->stream;
1341
1342         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1343
1344         /* shutdown the BEs */
1345         dpcm_be_dai_shutdown(fe, substream->stream);
1346
1347         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1348
1349         /* now shutdown the frontend */
1350         soc_pcm_close(substream);
1351
1352         /* run the stream event for each BE */
1353         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1354
1355         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1356         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1357         return 0;
1358 }
1359
1360 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1361 {
1362         struct snd_soc_dpcm *dpcm;
1363
1364         /* only hw_params backends that are either sinks or sources
1365          * to this frontend DAI */
1366         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1367
1368                 struct snd_soc_pcm_runtime *be = dpcm->be;
1369                 struct snd_pcm_substream *be_substream =
1370                         snd_soc_dpcm_get_substream(be, stream);
1371
1372                 /* is this op for this BE ? */
1373                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1374                         continue;
1375
1376                 /* only free hw when no longer used - check all FEs */
1377                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1378                                 continue;
1379
1380                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1381                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1382                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1383                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1384                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1385                         continue;
1386
1387                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1388                         dpcm->fe->dai_link->name);
1389
1390                 soc_pcm_hw_free(be_substream);
1391
1392                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1393         }
1394
1395         return 0;
1396 }
1397
1398 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1399 {
1400         struct snd_soc_pcm_runtime *fe = substream->private_data;
1401         int err, stream = substream->stream;
1402
1403         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1404         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1405
1406         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1407
1408         /* call hw_free on the frontend */
1409         err = soc_pcm_hw_free(substream);
1410         if (err < 0)
1411                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1412                         fe->dai_link->name);
1413
1414         /* only hw_params backends that are either sinks or sources
1415          * to this frontend DAI */
1416         err = dpcm_be_dai_hw_free(fe, stream);
1417
1418         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1419         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1420
1421         mutex_unlock(&fe->card->mutex);
1422         return 0;
1423 }
1424
1425 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1426 {
1427         struct snd_soc_dpcm *dpcm;
1428         int ret;
1429
1430         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1431
1432                 struct snd_soc_pcm_runtime *be = dpcm->be;
1433                 struct snd_pcm_substream *be_substream =
1434                         snd_soc_dpcm_get_substream(be, stream);
1435
1436                 /* is this op for this BE ? */
1437                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1438                         continue;
1439
1440                 /* only allow hw_params() if no connected FEs are running */
1441                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1442                         continue;
1443
1444                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1445                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1446                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1447                         continue;
1448
1449                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1450                         dpcm->fe->dai_link->name);
1451
1452                 /* copy params for each dpcm */
1453                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1454                                 sizeof(struct snd_pcm_hw_params));
1455
1456                 /* perform any hw_params fixups */
1457                 if (be->dai_link->be_hw_params_fixup) {
1458                         ret = be->dai_link->be_hw_params_fixup(be,
1459                                         &dpcm->hw_params);
1460                         if (ret < 0) {
1461                                 dev_err(be->dev,
1462                                         "ASoC: hw_params BE fixup failed %d\n",
1463                                         ret);
1464                                 goto unwind;
1465                         }
1466                 }
1467
1468                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1469                 if (ret < 0) {
1470                         dev_err(dpcm->be->dev,
1471                                 "ASoC: hw_params BE failed %d\n", ret);
1472                         goto unwind;
1473                 }
1474
1475                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1476         }
1477         return 0;
1478
1479 unwind:
1480         /* disable any enabled and non active backends */
1481         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1482                 struct snd_soc_pcm_runtime *be = dpcm->be;
1483                 struct snd_pcm_substream *be_substream =
1484                         snd_soc_dpcm_get_substream(be, stream);
1485
1486                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1487                         continue;
1488
1489                 /* only allow hw_free() if no connected FEs are running */
1490                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1491                         continue;
1492
1493                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1494                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1495                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1496                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1497                         continue;
1498
1499                 soc_pcm_hw_free(be_substream);
1500         }
1501
1502         return ret;
1503 }
1504
1505 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1506                                  struct snd_pcm_hw_params *params)
1507 {
1508         struct snd_soc_pcm_runtime *fe = substream->private_data;
1509         int ret, stream = substream->stream;
1510
1511         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1512         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1513
1514         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1515                         sizeof(struct snd_pcm_hw_params));
1516         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1517         if (ret < 0) {
1518                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1519                 goto out;
1520         }
1521
1522         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1523                         fe->dai_link->name, params_rate(params),
1524                         params_channels(params), params_format(params));
1525
1526         /* call hw_params on the frontend */
1527         ret = soc_pcm_hw_params(substream, params);
1528         if (ret < 0) {
1529                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1530                 dpcm_be_dai_hw_free(fe, stream);
1531          } else
1532                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1533
1534 out:
1535         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1536         mutex_unlock(&fe->card->mutex);
1537         return ret;
1538 }
1539
1540 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1541                 struct snd_pcm_substream *substream, int cmd)
1542 {
1543         int ret;
1544
1545         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1546                         dpcm->fe->dai_link->name, cmd);
1547
1548         ret = soc_pcm_trigger(substream, cmd);
1549         if (ret < 0)
1550                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1551
1552         return ret;
1553 }
1554
1555 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1556                                int cmd)
1557 {
1558         struct snd_soc_dpcm *dpcm;
1559         int ret = 0;
1560
1561         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1562
1563                 struct snd_soc_pcm_runtime *be = dpcm->be;
1564                 struct snd_pcm_substream *be_substream =
1565                         snd_soc_dpcm_get_substream(be, stream);
1566
1567                 /* is this op for this BE ? */
1568                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1569                         continue;
1570
1571                 switch (cmd) {
1572                 case SNDRV_PCM_TRIGGER_START:
1573                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1574                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1575                                 continue;
1576
1577                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1578                         if (ret)
1579                                 return ret;
1580
1581                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1582                         break;
1583                 case SNDRV_PCM_TRIGGER_RESUME:
1584                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1585                                 continue;
1586
1587                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1588                         if (ret)
1589                                 return ret;
1590
1591                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1592                         break;
1593                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1594                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1595                                 continue;
1596
1597                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1598                         if (ret)
1599                                 return ret;
1600
1601                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1602                         break;
1603                 case SNDRV_PCM_TRIGGER_STOP:
1604                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1605                                 continue;
1606
1607                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1608                                 continue;
1609
1610                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1611                         if (ret)
1612                                 return ret;
1613
1614                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1615                         break;
1616                 case SNDRV_PCM_TRIGGER_SUSPEND:
1617                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1618                                 continue;
1619
1620                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1621                                 continue;
1622
1623                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1624                         if (ret)
1625                                 return ret;
1626
1627                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1628                         break;
1629                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1630                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1631                                 continue;
1632
1633                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1634                                 continue;
1635
1636                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1637                         if (ret)
1638                                 return ret;
1639
1640                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1641                         break;
1642                 }
1643         }
1644
1645         return ret;
1646 }
1647 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1648
1649 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1650 {
1651         struct snd_soc_pcm_runtime *fe = substream->private_data;
1652         int stream = substream->stream, ret;
1653         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1654
1655         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1656
1657         switch (trigger) {
1658         case SND_SOC_DPCM_TRIGGER_PRE:
1659                 /* call trigger on the frontend before the backend. */
1660
1661                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1662                                 fe->dai_link->name, cmd);
1663
1664                 ret = soc_pcm_trigger(substream, cmd);
1665                 if (ret < 0) {
1666                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1667                         goto out;
1668                 }
1669
1670                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1671                 break;
1672         case SND_SOC_DPCM_TRIGGER_POST:
1673                 /* call trigger on the frontend after the backend. */
1674
1675                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1676                 if (ret < 0) {
1677                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1678                         goto out;
1679                 }
1680
1681                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1682                                 fe->dai_link->name, cmd);
1683
1684                 ret = soc_pcm_trigger(substream, cmd);
1685                 break;
1686         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1687                 /* bespoke trigger() - handles both FE and BEs */
1688
1689                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1690                                 fe->dai_link->name, cmd);
1691
1692                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1693                 if (ret < 0) {
1694                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1695                         goto out;
1696                 }
1697                 break;
1698         default:
1699                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1700                                 fe->dai_link->name);
1701                 ret = -EINVAL;
1702                 goto out;
1703         }
1704
1705         switch (cmd) {
1706         case SNDRV_PCM_TRIGGER_START:
1707         case SNDRV_PCM_TRIGGER_RESUME:
1708         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1709                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1710                 break;
1711         case SNDRV_PCM_TRIGGER_STOP:
1712         case SNDRV_PCM_TRIGGER_SUSPEND:
1713         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1714                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1715                 break;
1716         }
1717
1718 out:
1719         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1720         return ret;
1721 }
1722
1723 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1724 {
1725         struct snd_soc_dpcm *dpcm;
1726         int ret = 0;
1727
1728         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1729
1730                 struct snd_soc_pcm_runtime *be = dpcm->be;
1731                 struct snd_pcm_substream *be_substream =
1732                         snd_soc_dpcm_get_substream(be, stream);
1733
1734                 /* is this op for this BE ? */
1735                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1736                         continue;
1737
1738                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1739                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1740                         continue;
1741
1742                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
1743                         dpcm->fe->dai_link->name);
1744
1745                 ret = soc_pcm_prepare(be_substream);
1746                 if (ret < 0) {
1747                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
1748                                 ret);
1749                         break;
1750                 }
1751
1752                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1753         }
1754         return ret;
1755 }
1756
1757 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1758 {
1759         struct snd_soc_pcm_runtime *fe = substream->private_data;
1760         int stream = substream->stream, ret = 0;
1761
1762         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1763
1764         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
1765
1766         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1767
1768         /* there is no point preparing this FE if there are no BEs */
1769         if (list_empty(&fe->dpcm[stream].be_clients)) {
1770                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
1771                                 fe->dai_link->name);
1772                 ret = -EINVAL;
1773                 goto out;
1774         }
1775
1776         ret = dpcm_be_dai_prepare(fe, substream->stream);
1777         if (ret < 0)
1778                 goto out;
1779
1780         /* call prepare on the frontend */
1781         ret = soc_pcm_prepare(substream);
1782         if (ret < 0) {
1783                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
1784                         fe->dai_link->name);
1785                 goto out;
1786         }
1787
1788         /* run the stream event for each BE */
1789         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1790         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1791
1792 out:
1793         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1794         mutex_unlock(&fe->card->mutex);
1795
1796         return ret;
1797 }
1798
1799 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1800                      unsigned int cmd, void *arg)
1801 {
1802         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1803         struct snd_soc_platform *platform = rtd->platform;
1804
1805         if (platform->driver->ops && platform->driver->ops->ioctl)
1806                 return platform->driver->ops->ioctl(substream, cmd, arg);
1807         return snd_pcm_lib_ioctl(substream, cmd, arg);
1808 }
1809
1810 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1811 {
1812         struct snd_pcm_substream *substream =
1813                 snd_soc_dpcm_get_substream(fe, stream);
1814         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1815         int err;
1816
1817         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
1818                         stream ? "capture" : "playback", fe->dai_link->name);
1819
1820         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1821                 /* call bespoke trigger - FE takes care of all BE triggers */
1822                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
1823                                 fe->dai_link->name);
1824
1825                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1826                 if (err < 0)
1827                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1828         } else {
1829                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
1830                         fe->dai_link->name);
1831
1832                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1833                 if (err < 0)
1834                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1835         }
1836
1837         err = dpcm_be_dai_hw_free(fe, stream);
1838         if (err < 0)
1839                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
1840
1841         err = dpcm_be_dai_shutdown(fe, stream);
1842         if (err < 0)
1843                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
1844
1845         /* run the stream event for each BE */
1846         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1847
1848         return 0;
1849 }
1850
1851 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1852 {
1853         struct snd_pcm_substream *substream =
1854                 snd_soc_dpcm_get_substream(fe, stream);
1855         struct snd_soc_dpcm *dpcm;
1856         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1857         int ret;
1858
1859         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
1860                         stream ? "capture" : "playback", fe->dai_link->name);
1861
1862         /* Only start the BE if the FE is ready */
1863         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1864                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1865                 return -EINVAL;
1866
1867         /* startup must always be called for new BEs */
1868         ret = dpcm_be_dai_startup(fe, stream);
1869         if (ret < 0)
1870                 goto disconnect;
1871
1872         /* keep going if FE state is > open */
1873         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1874                 return 0;
1875
1876         ret = dpcm_be_dai_hw_params(fe, stream);
1877         if (ret < 0)
1878                 goto close;
1879
1880         /* keep going if FE state is > hw_params */
1881         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1882                 return 0;
1883
1884
1885         ret = dpcm_be_dai_prepare(fe, stream);
1886         if (ret < 0)
1887                 goto hw_free;
1888
1889         /* run the stream event for each BE */
1890         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1891
1892         /* keep going if FE state is > prepare */
1893         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1894                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1895                 return 0;
1896
1897         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1898                 /* call trigger on the frontend - FE takes care of all BE triggers */
1899                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
1900                                 fe->dai_link->name);
1901
1902                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1903                 if (ret < 0) {
1904                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
1905                         goto hw_free;
1906                 }
1907         } else {
1908                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
1909                         fe->dai_link->name);
1910
1911                 ret = dpcm_be_dai_trigger(fe, stream,
1912                                         SNDRV_PCM_TRIGGER_START);
1913                 if (ret < 0) {
1914                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1915                         goto hw_free;
1916                 }
1917         }
1918
1919         return 0;
1920
1921 hw_free:
1922         dpcm_be_dai_hw_free(fe, stream);
1923 close:
1924         dpcm_be_dai_shutdown(fe, stream);
1925 disconnect:
1926         /* disconnect any non started BEs */
1927         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1928                 struct snd_soc_pcm_runtime *be = dpcm->be;
1929                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1930                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1931         }
1932
1933         return ret;
1934 }
1935
1936 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1937 {
1938         int ret;
1939
1940         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1941         ret = dpcm_run_update_startup(fe, stream);
1942         if (ret < 0)
1943                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
1944         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1945
1946         return ret;
1947 }
1948
1949 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1950 {
1951         int ret;
1952
1953         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1954         ret = dpcm_run_update_shutdown(fe, stream);
1955         if (ret < 0)
1956                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
1957         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1958
1959         return ret;
1960 }
1961
1962 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1963  * any DAI links.
1964  */
1965 int soc_dpcm_runtime_update(struct snd_soc_card *card)
1966 {
1967         int i, old, new, paths;
1968
1969         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1970         for (i = 0; i < card->num_rtd; i++) {
1971                 struct snd_soc_dapm_widget_list *list;
1972                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1973
1974                 /* make sure link is FE */
1975                 if (!fe->dai_link->dynamic)
1976                         continue;
1977
1978                 /* only check active links */
1979                 if (!fe->cpu_dai->active)
1980                         continue;
1981
1982                 /* DAPM sync will call this to update DSP paths */
1983                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
1984                         fe->dai_link->name);
1985
1986                 /* skip if FE doesn't have playback capability */
1987                 if (!fe->cpu_dai->driver->playback.channels_min)
1988                         goto capture;
1989
1990                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1991                 if (paths < 0) {
1992                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1993                                         fe->dai_link->name,  "playback");
1994                         mutex_unlock(&card->mutex);
1995                         return paths;
1996                 }
1997
1998                 /* update any new playback paths */
1999                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2000                 if (new) {
2001                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2002                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2003                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2004                 }
2005
2006                 /* update any old playback paths */
2007                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2008                 if (old) {
2009                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2010                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2011                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2012                 }
2013
2014 capture:
2015                 /* skip if FE doesn't have capture capability */
2016                 if (!fe->cpu_dai->driver->capture.channels_min)
2017                         continue;
2018
2019                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2020                 if (paths < 0) {
2021                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2022                                         fe->dai_link->name,  "capture");
2023                         mutex_unlock(&card->mutex);
2024                         return paths;
2025                 }
2026
2027                 /* update any new capture paths */
2028                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2029                 if (new) {
2030                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2031                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2032                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2033                 }
2034
2035                 /* update any old capture paths */
2036                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2037                 if (old) {
2038                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2039                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2040                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2041                 }
2042
2043                 dpcm_path_put(&list);
2044         }
2045
2046         mutex_unlock(&card->mutex);
2047         return 0;
2048 }
2049 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2050 {
2051         struct snd_soc_dpcm *dpcm;
2052         struct list_head *clients =
2053                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2054
2055         list_for_each_entry(dpcm, clients, list_be) {
2056
2057                 struct snd_soc_pcm_runtime *be = dpcm->be;
2058                 struct snd_soc_dai *dai = be->codec_dai;
2059                 struct snd_soc_dai_driver *drv = dai->driver;
2060
2061                 if (be->dai_link->ignore_suspend)
2062                         continue;
2063
2064                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
2065
2066                 if (drv->ops && drv->ops->digital_mute && dai->playback_active)
2067                         drv->ops->digital_mute(dai, mute);
2068         }
2069
2070         return 0;
2071 }
2072
2073 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2074 {
2075         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2076         struct snd_soc_dpcm *dpcm;
2077         struct snd_soc_dapm_widget_list *list;
2078         int ret;
2079         int stream = fe_substream->stream;
2080
2081         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2082         fe->dpcm[stream].runtime = fe_substream->runtime;
2083
2084         if (dpcm_path_get(fe, stream, &list) <= 0) {
2085                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2086                         fe->dai_link->name, stream ? "capture" : "playback");
2087         }
2088
2089         /* calculate valid and active FE <-> BE dpcms */
2090         dpcm_process_paths(fe, stream, &list, 1);
2091
2092         ret = dpcm_fe_dai_startup(fe_substream);
2093         if (ret < 0) {
2094                 /* clean up all links */
2095                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2096                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2097
2098                 dpcm_be_disconnect(fe, stream);
2099                 fe->dpcm[stream].runtime = NULL;
2100         }
2101
2102         dpcm_clear_pending_state(fe, stream);
2103         dpcm_path_put(&list);
2104         mutex_unlock(&fe->card->mutex);
2105         return ret;
2106 }
2107
2108 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2109 {
2110         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2111         struct snd_soc_dpcm *dpcm;
2112         int stream = fe_substream->stream, ret;
2113
2114         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2115         ret = dpcm_fe_dai_shutdown(fe_substream);
2116
2117         /* mark FE's links ready to prune */
2118         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2119                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2120
2121         dpcm_be_disconnect(fe, stream);
2122
2123         fe->dpcm[stream].runtime = NULL;
2124         mutex_unlock(&fe->card->mutex);
2125         return ret;
2126 }
2127
2128 /* create a new pcm */
2129 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2130 {
2131         struct snd_soc_platform *platform = rtd->platform;
2132         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2133         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2134         struct snd_pcm *pcm;
2135         char new_name[64];
2136         int ret = 0, playback = 0, capture = 0;
2137
2138         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2139                 playback = rtd->dai_link->dpcm_playback;
2140                 capture = rtd->dai_link->dpcm_capture;
2141         } else {
2142                 if (codec_dai->driver->playback.channels_min &&
2143                     cpu_dai->driver->playback.channels_min)
2144                         playback = 1;
2145                 if (codec_dai->driver->capture.channels_min &&
2146                     cpu_dai->driver->capture.channels_min)
2147                         capture = 1;
2148         }
2149
2150         if (rtd->dai_link->playback_only) {
2151                 playback = 1;
2152                 capture = 0;
2153         }
2154
2155         if (rtd->dai_link->capture_only) {
2156                 playback = 0;
2157                 capture = 1;
2158         }
2159
2160         /* create the PCM */
2161         if (rtd->dai_link->no_pcm) {
2162                 snprintf(new_name, sizeof(new_name), "(%s)",
2163                         rtd->dai_link->stream_name);
2164
2165                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2166                                 playback, capture, &pcm);
2167         } else {
2168                 if (rtd->dai_link->dynamic)
2169                         snprintf(new_name, sizeof(new_name), "%s (*)",
2170                                 rtd->dai_link->stream_name);
2171                 else
2172                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2173                                 rtd->dai_link->stream_name, codec_dai->name, num);
2174
2175                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2176                         capture, &pcm);
2177         }
2178         if (ret < 0) {
2179                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2180                         rtd->dai_link->name);
2181                 return ret;
2182         }
2183         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2184
2185         /* DAPM dai link stream work */
2186         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2187
2188         rtd->pcm = pcm;
2189         pcm->private_data = rtd;
2190
2191         if (rtd->dai_link->no_pcm) {
2192                 if (playback)
2193                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2194                 if (capture)
2195                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2196                 goto out;
2197         }
2198
2199         /* ASoC PCM operations */
2200         if (rtd->dai_link->dynamic) {
2201                 rtd->ops.open           = dpcm_fe_dai_open;
2202                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2203                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2204                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2205                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2206                 rtd->ops.close          = dpcm_fe_dai_close;
2207                 rtd->ops.pointer        = soc_pcm_pointer;
2208                 rtd->ops.ioctl          = soc_pcm_ioctl;
2209         } else {
2210                 rtd->ops.open           = soc_pcm_open;
2211                 rtd->ops.hw_params      = soc_pcm_hw_params;
2212                 rtd->ops.prepare        = soc_pcm_prepare;
2213                 rtd->ops.trigger        = soc_pcm_trigger;
2214                 rtd->ops.hw_free        = soc_pcm_hw_free;
2215                 rtd->ops.close          = soc_pcm_close;
2216                 rtd->ops.pointer        = soc_pcm_pointer;
2217                 rtd->ops.ioctl          = soc_pcm_ioctl;
2218         }
2219
2220         if (platform->driver->ops) {
2221                 rtd->ops.ack            = platform->driver->ops->ack;
2222                 rtd->ops.copy           = platform->driver->ops->copy;
2223                 rtd->ops.silence        = platform->driver->ops->silence;
2224                 rtd->ops.page           = platform->driver->ops->page;
2225                 rtd->ops.mmap           = platform->driver->ops->mmap;
2226         }
2227
2228         if (playback)
2229                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2230
2231         if (capture)
2232                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2233
2234         if (platform->driver->pcm_new) {
2235                 ret = platform->driver->pcm_new(rtd);
2236                 if (ret < 0) {
2237                         dev_err(platform->dev,
2238                                 "ASoC: pcm constructor failed: %d\n",
2239                                 ret);
2240                         return ret;
2241                 }
2242         }
2243
2244         pcm->private_free = platform->driver->pcm_free;
2245 out:
2246         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n", codec_dai->name,
2247                 cpu_dai->name);
2248         return ret;
2249 }
2250
2251 /* is the current PCM operation for this FE ? */
2252 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2253 {
2254         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2255                 return 1;
2256         return 0;
2257 }
2258 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2259
2260 /* is the current PCM operation for this BE ? */
2261 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2262                 struct snd_soc_pcm_runtime *be, int stream)
2263 {
2264         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2265            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2266                   be->dpcm[stream].runtime_update))
2267                 return 1;
2268         return 0;
2269 }
2270 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2271
2272 /* get the substream for this BE */
2273 struct snd_pcm_substream *
2274         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2275 {
2276         return be->pcm->streams[stream].substream;
2277 }
2278 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2279
2280 /* get the BE runtime state */
2281 enum snd_soc_dpcm_state
2282         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2283 {
2284         return be->dpcm[stream].state;
2285 }
2286 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2287
2288 /* set the BE runtime state */
2289 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2290                 int stream, enum snd_soc_dpcm_state state)
2291 {
2292         be->dpcm[stream].state = state;
2293 }
2294 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2295
2296 /*
2297  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2298  * are not running, paused or suspended for the specified stream direction.
2299  */
2300 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2301                 struct snd_soc_pcm_runtime *be, int stream)
2302 {
2303         struct snd_soc_dpcm *dpcm;
2304         int state;
2305
2306         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2307
2308                 if (dpcm->fe == fe)
2309                         continue;
2310
2311                 state = dpcm->fe->dpcm[stream].state;
2312                 if (state == SND_SOC_DPCM_STATE_START ||
2313                         state == SND_SOC_DPCM_STATE_PAUSED ||
2314                         state == SND_SOC_DPCM_STATE_SUSPEND)
2315                         return 0;
2316         }
2317
2318         /* it's safe to free/stop this BE DAI */
2319         return 1;
2320 }
2321 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2322
2323 /*
2324  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2325  * running, paused or suspended for the specified stream direction.
2326  */
2327 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2328                 struct snd_soc_pcm_runtime *be, int stream)
2329 {
2330         struct snd_soc_dpcm *dpcm;
2331         int state;
2332
2333         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2334
2335                 if (dpcm->fe == fe)
2336                         continue;
2337
2338                 state = dpcm->fe->dpcm[stream].state;
2339                 if (state == SND_SOC_DPCM_STATE_START ||
2340                         state == SND_SOC_DPCM_STATE_PAUSED ||
2341                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2342                         state == SND_SOC_DPCM_STATE_PREPARE)
2343                         return 0;
2344         }
2345
2346         /* it's safe to change hw_params */
2347         return 1;
2348 }
2349 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2350
2351 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2352                 int cmd, struct snd_soc_platform *platform)
2353 {
2354         if (platform->driver->ops && platform->driver->ops->trigger)
2355                 return platform->driver->ops->trigger(substream, cmd);
2356         return 0;
2357 }
2358 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2359
2360 #ifdef CONFIG_DEBUG_FS
2361 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2362 {
2363         switch (state) {
2364         case SND_SOC_DPCM_STATE_NEW:
2365                 return "new";
2366         case SND_SOC_DPCM_STATE_OPEN:
2367                 return "open";
2368         case SND_SOC_DPCM_STATE_HW_PARAMS:
2369                 return "hw_params";
2370         case SND_SOC_DPCM_STATE_PREPARE:
2371                 return "prepare";
2372         case SND_SOC_DPCM_STATE_START:
2373                 return "start";
2374         case SND_SOC_DPCM_STATE_STOP:
2375                 return "stop";
2376         case SND_SOC_DPCM_STATE_SUSPEND:
2377                 return "suspend";
2378         case SND_SOC_DPCM_STATE_PAUSED:
2379                 return "paused";
2380         case SND_SOC_DPCM_STATE_HW_FREE:
2381                 return "hw_free";
2382         case SND_SOC_DPCM_STATE_CLOSE:
2383                 return "close";
2384         }
2385
2386         return "unknown";
2387 }
2388
2389 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2390                                 int stream, char *buf, size_t size)
2391 {
2392         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2393         struct snd_soc_dpcm *dpcm;
2394         ssize_t offset = 0;
2395
2396         /* FE state */
2397         offset += snprintf(buf + offset, size - offset,
2398                         "[%s - %s]\n", fe->dai_link->name,
2399                         stream ? "Capture" : "Playback");
2400
2401         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2402                         dpcm_state_string(fe->dpcm[stream].state));
2403
2404         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2405             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2406                 offset += snprintf(buf + offset, size - offset,
2407                                 "Hardware Params: "
2408                                 "Format = %s, Channels = %d, Rate = %d\n",
2409                                 snd_pcm_format_name(params_format(params)),
2410                                 params_channels(params),
2411                                 params_rate(params));
2412
2413         /* BEs state */
2414         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2415
2416         if (list_empty(&fe->dpcm[stream].be_clients)) {
2417                 offset += snprintf(buf + offset, size - offset,
2418                                 " No active DSP links\n");
2419                 goto out;
2420         }
2421
2422         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2423                 struct snd_soc_pcm_runtime *be = dpcm->be;
2424                 params = &dpcm->hw_params;
2425
2426                 offset += snprintf(buf + offset, size - offset,
2427                                 "- %s\n", be->dai_link->name);
2428
2429                 offset += snprintf(buf + offset, size - offset,
2430                                 "   State: %s\n",
2431                                 dpcm_state_string(be->dpcm[stream].state));
2432
2433                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2434                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2435                         offset += snprintf(buf + offset, size - offset,
2436                                 "   Hardware Params: "
2437                                 "Format = %s, Channels = %d, Rate = %d\n",
2438                                 snd_pcm_format_name(params_format(params)),
2439                                 params_channels(params),
2440                                 params_rate(params));
2441         }
2442
2443 out:
2444         return offset;
2445 }
2446
2447 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2448                                 size_t count, loff_t *ppos)
2449 {
2450         struct snd_soc_pcm_runtime *fe = file->private_data;
2451         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2452         char *buf;
2453
2454         buf = kmalloc(out_count, GFP_KERNEL);
2455         if (!buf)
2456                 return -ENOMEM;
2457
2458         if (fe->cpu_dai->driver->playback.channels_min)
2459                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2460                                         buf + offset, out_count - offset);
2461
2462         if (fe->cpu_dai->driver->capture.channels_min)
2463                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2464                                         buf + offset, out_count - offset);
2465
2466         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2467
2468         kfree(buf);
2469         return ret;
2470 }
2471
2472 static const struct file_operations dpcm_state_fops = {
2473         .open = simple_open,
2474         .read = dpcm_state_read_file,
2475         .llseek = default_llseek,
2476 };
2477
2478 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2479 {
2480         if (!rtd->dai_link)
2481                 return 0;
2482
2483         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2484                         rtd->card->debugfs_card_root);
2485         if (!rtd->debugfs_dpcm_root) {
2486                 dev_dbg(rtd->dev,
2487                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2488                          rtd->dai_link->name);
2489                 return -EINVAL;
2490         }
2491
2492         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2493                                                 rtd->debugfs_dpcm_root,
2494                                                 rtd, &dpcm_state_fops);
2495
2496         return 0;
2497 }
2498 #endif