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_runtime_activate() - Increment active count for PCM runtime components
  39  * @rtd: ASoC PCM runtime that is activated
  40  * @stream: Direction of the PCM stream
  41  *
  42  * Increments the active count for all the DAIs and components attached to a PCM
  43  * runtime. Should typically be called when a stream is opened.
  44  *
  45  * Must be called with the rtd->pcm_mutex being held
  46  */
  47 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
  48 {
  49         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  50         int i;
  51
  52         lockdep_assert_held(&rtd->pcm_mutex);
  53
  54         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  55                 cpu_dai->playback_active++;
  56                 for (i = 0; i < rtd->num_codecs; i++)
  57                         rtd->codec_dais[i]->playback_active++;
  58         } else {
  59                 cpu_dai->capture_active++;
  60                 for (i = 0; i < rtd->num_codecs; i++)
  61                         rtd->codec_dais[i]->capture_active++;
  62         }
  63
  64         cpu_dai->active++;
  65         cpu_dai->component->active++;
  66         for (i = 0; i < rtd->num_codecs; i++) {
  67                 rtd->codec_dais[i]->active++;
  68                 rtd->codec_dais[i]->component->active++;
  69         }
  70 }
  71
  72 /**
  73  * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
  74  * @rtd: ASoC PCM runtime that is deactivated
  75  * @stream: Direction of the PCM stream
  76  *
  77  * Decrements the active count for all the DAIs and components attached to a PCM
  78  * runtime. Should typically be called when a stream is closed.
  79  *
  80  * Must be called with the rtd->pcm_mutex being held
  81  */
  82 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
  83 {
  84         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  85         int i;
  86
  87         lockdep_assert_held(&rtd->pcm_mutex);
  88
  89         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  90                 cpu_dai->playback_active--;
  91                 for (i = 0; i < rtd->num_codecs; i++)
  92                         rtd->codec_dais[i]->playback_active--;
  93         } else {
  94                 cpu_dai->capture_active--;
  95                 for (i = 0; i < rtd->num_codecs; i++)
  96                         rtd->codec_dais[i]->capture_active--;
  97         }
  98
  99         cpu_dai->active--;
 100         cpu_dai->component->active--;
 101         for (i = 0; i < rtd->num_codecs; i++) {
 102                 rtd->codec_dais[i]->component->active--;
 103                 rtd->codec_dais[i]->active--;
 104         }
 105 }
 106
 107 /**
 108  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 109  * @rtd: The ASoC PCM runtime that should be checked.
 110  *
 111  * This function checks whether the power down delay should be ignored for a
 112  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 113  * been configured to ignore the delay, or if none of the components benefits
 114  * from having the delay.
 115  */
 116 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 117 {
 118         int i;
 119         bool ignore = true;
 120
 121         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 122                 return true;
 123
 124         for (i = 0; i < rtd->num_codecs; i++)
 125                 ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time;
 126
 127         return rtd->cpu_dai->component->ignore_pmdown_time && ignore;
 128 }
 129
 130 /**
 131  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 132  * @substream: the pcm substream
 133  * @hw: the hardware parameters
 134  *
 135  * Sets the substream runtime hardware parameters.
 136  */
 137 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 138         const struct snd_pcm_hardware *hw)
 139 {
 140         struct snd_pcm_runtime *runtime = substream->runtime;
 141         runtime->hw.info = hw->info;
 142         runtime->hw.formats = hw->formats;
 143         runtime->hw.period_bytes_min = hw->period_bytes_min;
 144         runtime->hw.period_bytes_max = hw->period_bytes_max;
 145         runtime->hw.periods_min = hw->periods_min;
 146         runtime->hw.periods_max = hw->periods_max;
 147         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
 148         runtime->hw.fifo_size = hw->fifo_size;
 149         return 0;
 150 }
 151 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 152
 153 /* DPCM stream event, send event to FE and all active BEs. */
 154 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 155         int event)
 156 {
 157         struct snd_soc_dpcm *dpcm;
 158
 159         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
 160
 161                 struct snd_soc_pcm_runtime *be = dpcm->be;
 162
 163                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 164                                 be->dai_link->name, event, dir);
 165
 166                 snd_soc_dapm_stream_event(be, dir, event);
 167         }
 168
 169         snd_soc_dapm_stream_event(fe, dir, event);
 170
 171         return 0;
 172 }
 173
 174 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 175                                         struct snd_soc_dai *soc_dai)
 176 {
 177         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 178         int ret;
 179
 180         if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
 181                                 rtd->dai_link->symmetric_rates)) {
 182                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
 183                                 soc_dai->rate);
 184
 185                 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 186                                                 SNDRV_PCM_HW_PARAM_RATE,
 187                                                 soc_dai->rate, soc_dai->rate);
 188                 if (ret < 0) {
 189                         dev_err(soc_dai->dev,
 190                                 "ASoC: Unable to apply rate constraint: %d\n",
 191                                 ret);
 192                         return ret;
 193                 }
 194         }
 195
 196         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
 197                                 rtd->dai_link->symmetric_channels)) {
 198                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
 199                                 soc_dai->channels);
 200
 201                 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 202                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
 203                                                 soc_dai->channels,
 204                                                 soc_dai->channels);
 205                 if (ret < 0) {
 206                         dev_err(soc_dai->dev,
 207                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
 208                                 ret);
 209                         return ret;
 210                 }
 211         }
 212
 213         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
 214                                 rtd->dai_link->symmetric_samplebits)) {
 215                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
 216                                 soc_dai->sample_bits);
 217
 218                 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 219                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
 220                                                 soc_dai->sample_bits,
 221                                                 soc_dai->sample_bits);
 222                 if (ret < 0) {
 223                         dev_err(soc_dai->dev,
 224                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
 225                                 ret);
 226                         return ret;
 227                 }
 228         }
 229
 230         return 0;
 231 }
 232
 233 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 234                                 struct snd_pcm_hw_params *params)
 235 {
 236         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 237         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 238         unsigned int rate, channels, sample_bits, symmetry, i;
 239
 240         rate = params_rate(params);
 241         channels = params_channels(params);
 242         sample_bits = snd_pcm_format_physical_width(params_format(params));
 243
 244         /* reject unmatched parameters when applying symmetry */
 245         symmetry = cpu_dai->driver->symmetric_rates ||
 246                 rtd->dai_link->symmetric_rates;
 247
 248         for (i = 0; i < rtd->num_codecs; i++)
 249                 symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;
 250
 251         if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
 252                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
 253                                 cpu_dai->rate, rate);
 254                 return -EINVAL;
 255         }
 256
 257         symmetry = cpu_dai->driver->symmetric_channels ||
 258                 rtd->dai_link->symmetric_channels;
 259
 260         for (i = 0; i < rtd->num_codecs; i++)
 261                 symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;
 262
 263         if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
 264                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
 265                                 cpu_dai->channels, channels);
 266                 return -EINVAL;
 267         }
 268
 269         symmetry = cpu_dai->driver->symmetric_samplebits ||
 270                 rtd->dai_link->symmetric_samplebits;
 271
 272         for (i = 0; i < rtd->num_codecs; i++)
 273                 symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;
 274
 275         if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
 276                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
 277                                 cpu_dai->sample_bits, sample_bits);
 278                 return -EINVAL;
 279         }
 280
 281         return 0;
 282 }
 283
 284 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
 285 {
 286         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 287         struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
 288         struct snd_soc_dai_link *link = rtd->dai_link;
 289         unsigned int symmetry, i;
 290
 291         symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
 292                 cpu_driver->symmetric_channels || link->symmetric_channels ||
 293                 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
 294
 295         for (i = 0; i < rtd->num_codecs; i++)
 296                 symmetry = symmetry ||
 297                         rtd->codec_dais[i]->driver->symmetric_rates ||
 298                         rtd->codec_dais[i]->driver->symmetric_channels ||
 299                         rtd->codec_dais[i]->driver->symmetric_samplebits;
 300
 301         return symmetry;
 302 }
 303
 304 /*
 305  * List of sample sizes that might go over the bus for parameter
 306  * application.  There ought to be a wildcard sample size for things
 307  * like the DAC/ADC resolution to use but there isn't right now.
 308  */
 309 static int sample_sizes[] = {
 310         24, 32,
 311 };
 312
 313 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 314 {
 315         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 316         int ret, i;
 317
 318         if (!bits)
 319                 return;
 320
 321         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
 322                 if (bits >= sample_sizes[i])
 323                         continue;
 324
 325                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
 326                                                    sample_sizes[i], bits);
 327                 if (ret != 0)
 328                         dev_warn(rtd->dev,
 329                                  "ASoC: Failed to set MSB %d/%d: %d\n",
 330                                  bits, sample_sizes[i], ret);
 331         }
 332 }
 333
 334 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 335 {
 336         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 337         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 338         struct snd_soc_dai *codec_dai;
 339         int i;
 340         unsigned int bits = 0, cpu_bits;
 341
 342         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 343                 for (i = 0; i < rtd->num_codecs; i++) {
 344                         codec_dai = rtd->codec_dais[i];
 345                         if (codec_dai->driver->playback.sig_bits == 0) {
 346                                 bits = 0;
 347                                 break;
 348                         }
 349                         bits = max(codec_dai->driver->playback.sig_bits, bits);
 350                 }
 351                 cpu_bits = cpu_dai->driver->playback.sig_bits;
 352         } else {
 353                 for (i = 0; i < rtd->num_codecs; i++) {
 354                         codec_dai = rtd->codec_dais[i];
 355                         if (codec_dai->driver->capture.sig_bits == 0) {
 356                                 bits = 0;
 357                                 break;
 358                         }
 359                         bits = max(codec_dai->driver->capture.sig_bits, bits);
 360                 }
 361                 cpu_bits = cpu_dai->driver->capture.sig_bits;
 362         }
 363
 364         soc_pcm_set_msb(substream, bits);
 365         soc_pcm_set_msb(substream, cpu_bits);
 366 }
 367
 368 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 369 {
 370         struct snd_pcm_runtime *runtime = substream->runtime;
 371         struct snd_pcm_hardware *hw = &runtime->hw;
 372         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 373         struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
 374         struct snd_soc_dai_driver *codec_dai_drv;
 375         struct snd_soc_pcm_stream *codec_stream;
 376         struct snd_soc_pcm_stream *cpu_stream;
 377         unsigned int chan_min = 0, chan_max = UINT_MAX;
 378         unsigned int rate_min = 0, rate_max = UINT_MAX;
 379         unsigned int rates = UINT_MAX;
 380         u64 formats = ULLONG_MAX;
 381         int i;
 382
 383         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 384                 cpu_stream = &cpu_dai_drv->playback;
 385         else
 386                 cpu_stream = &cpu_dai_drv->capture;
 387
 388         /* first calculate min/max only for CODECs in the DAI link */
 389         for (i = 0; i < rtd->num_codecs; i++) {
 390                 codec_dai_drv = rtd->codec_dais[i]->driver;
 391                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 392                         codec_stream = &codec_dai_drv->playback;
 393                 else
 394                         codec_stream = &codec_dai_drv->capture;
 395                 chan_min = max(chan_min, codec_stream->channels_min);
 396                 chan_max = min(chan_max, codec_stream->channels_max);
 397                 rate_min = max(rate_min, codec_stream->rate_min);
 398                 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
 399                 formats &= codec_stream->formats;
 400                 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
 401         }
 402
 403         /*
 404          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 405          * connected to a single CPU DAI, use CPU DAI's directly and let
 406          * channel allocation be fixed up later
 407          */
 408         if (rtd->num_codecs > 1) {
 409                 chan_min = cpu_stream->channels_min;
 410                 chan_max = cpu_stream->channels_max;
 411         }
 412
 413         hw->channels_min = max(chan_min, cpu_stream->channels_min);
 414         hw->channels_max = min(chan_max, cpu_stream->channels_max);
 415         if (hw->formats)
 416                 hw->formats &= formats & cpu_stream->formats;
 417         else
 418                 hw->formats = formats & cpu_stream->formats;
 419         hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
 420
 421         snd_pcm_limit_hw_rates(runtime);
 422
 423         hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
 424         hw->rate_min = max(hw->rate_min, rate_min);
 425         hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
 426         hw->rate_max = min_not_zero(hw->rate_max, rate_max);
 427 }
 428
 429 /*
 430  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 431  * then initialized and any private data can be allocated. This also calls
 432  * startup for the cpu DAI, platform, machine and codec DAI.
 433  */
 434 static int soc_pcm_open(struct snd_pcm_substream *substream)
 435 {
 436         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 437         struct snd_pcm_runtime *runtime = substream->runtime;
 438         struct snd_soc_platform *platform = rtd->platform;
 439         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 440         struct snd_soc_dai *codec_dai;
 441         const char *codec_dai_name = "multicodec";
 442         int i, ret = 0;
 443
 444         pinctrl_pm_select_default_state(cpu_dai->dev);
 445         for (i = 0; i < rtd->num_codecs; i++)
 446                 pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
 447         pm_runtime_get_sync(cpu_dai->dev);
 448         for (i = 0; i < rtd->num_codecs; i++)
 449                 pm_runtime_get_sync(rtd->codec_dais[i]->dev);
 450         pm_runtime_get_sync(platform->dev);
 451
 452         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 453
 454         /* startup the audio subsystem */
 455         if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
 456                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 457                 if (ret < 0) {
 458                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 459                                 " %s: %d\n", cpu_dai->name, ret);
 460                         goto out;
 461                 }
 462         }
 463
 464         if (platform->driver->ops && platform->driver->ops->open) {
 465                 ret = platform->driver->ops->open(substream);
 466                 if (ret < 0) {
 467                         dev_err(platform->dev, "ASoC: can't open platform"
 468                                 " %s: %d\n", platform->component.name, ret);
 469                         goto platform_err;
 470                 }
 471         }
 472
 473         for (i = 0; i < rtd->num_codecs; i++) {
 474                 codec_dai = rtd->codec_dais[i];
 475                 if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
 476                         ret = codec_dai->driver->ops->startup(substream,
 477                                                               codec_dai);
 478                         if (ret < 0) {
 479                                 dev_err(codec_dai->dev,
 480                                         "ASoC: can't open codec %s: %d\n",
 481                                         codec_dai->name, ret);
 482                                 goto codec_dai_err;
 483                         }
 484                 }
 485
 486                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 487                         codec_dai->tx_mask = 0;
 488                 else
 489                         codec_dai->rx_mask = 0;
 490         }
 491
 492         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 493                 ret = rtd->dai_link->ops->startup(substream);
 494                 if (ret < 0) {
 495                         pr_err("ASoC: %s startup failed: %d\n",
 496                                rtd->dai_link->name, ret);
 497                         goto machine_err;
 498                 }
 499         }
 500
 501         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 502         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 503                 goto dynamic;
 504
 505         /* Check that the codec and cpu DAIs are compatible */
 506         soc_pcm_init_runtime_hw(substream);
 507
 508         if (rtd->num_codecs == 1)
 509                 codec_dai_name = rtd->codec_dai->name;
 510
 511         if (soc_pcm_has_symmetry(substream))
 512                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 513
 514         ret = -EINVAL;
 515         if (!runtime->hw.rates) {
 516                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 517                         codec_dai_name, cpu_dai->name);
 518                 goto config_err;
 519         }
 520         if (!runtime->hw.formats) {
 521                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 522                         codec_dai_name, cpu_dai->name);
 523                 goto config_err;
 524         }
 525         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 526             runtime->hw.channels_min > runtime->hw.channels_max) {
 527                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 528                                 codec_dai_name, cpu_dai->name);
 529                 goto config_err;
 530         }
 531
 532         soc_pcm_apply_msb(substream);
 533
 534         /* Symmetry only applies if we've already got an active stream. */
 535         if (cpu_dai->active) {
 536                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 537                 if (ret != 0)
 538                         goto config_err;
 539         }
 540
 541         for (i = 0; i < rtd->num_codecs; i++) {
 542                 if (rtd->codec_dais[i]->active) {
 543                         ret = soc_pcm_apply_symmetry(substream,
 544                                                      rtd->codec_dais[i]);
 545                         if (ret != 0)
 546                                 goto config_err;
 547                 }
 548         }
 549
 550         pr_debug("ASoC: %s <-> %s info:\n",
 551                         codec_dai_name, cpu_dai->name);
 552         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 553         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 554                  runtime->hw.channels_max);
 555         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 556                  runtime->hw.rate_max);
 557
 558 dynamic:
 559
 560         snd_soc_runtime_activate(rtd, substream->stream);
 561
 562         mutex_unlock(&rtd->pcm_mutex);
 563         return 0;
 564
 565 config_err:
 566         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 567                 rtd->dai_link->ops->shutdown(substream);
 568
 569 machine_err:
 570         i = rtd->num_codecs;
 571
 572 codec_dai_err:
 573         while (--i >= 0) {
 574                 codec_dai = rtd->codec_dais[i];
 575                 if (codec_dai->driver->ops->shutdown)
 576                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 577         }
 578
 579         if (platform->driver->ops && platform->driver->ops->close)
 580                 platform->driver->ops->close(substream);
 581
 582 platform_err:
 583         if (cpu_dai->driver->ops->shutdown)
 584                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 585 out:
 586         mutex_unlock(&rtd->pcm_mutex);
 587
 588         pm_runtime_put(platform->dev);
 589         for (i = 0; i < rtd->num_codecs; i++)
 590                 pm_runtime_put(rtd->codec_dais[i]->dev);
 591         pm_runtime_put(cpu_dai->dev);
 592         for (i = 0; i < rtd->num_codecs; i++) {
 593                 if (!rtd->codec_dais[i]->active)
 594                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 595         }
 596         if (!cpu_dai->active)
 597                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 598
 599         return ret;
 600 }
 601
 602 /*
 603  * Power down the audio subsystem pmdown_time msecs after close is called.
 604  * This is to ensure there are no pops or clicks in between any music tracks
 605  * due to DAPM power cycling.
 606  */
 607 static void close_delayed_work(struct work_struct *work)
 608 {
 609         struct snd_soc_pcm_runtime *rtd =
 610                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 611         struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
 612
 613         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 614
 615         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 616                  codec_dai->driver->playback.stream_name,
 617                  codec_dai->playback_active ? "active" : "inactive",
 618                  rtd->pop_wait ? "yes" : "no");
 619
 620         /* are we waiting on this codec DAI stream */
 621         if (rtd->pop_wait == 1) {
 622                 rtd->pop_wait = 0;
 623                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 624                                           SND_SOC_DAPM_STREAM_STOP);
 625         }
 626
 627         mutex_unlock(&rtd->pcm_mutex);
 628 }
 629
 630 /*
 631  * Called by ALSA when a PCM substream is closed. Private data can be
 632  * freed here. The cpu DAI, codec DAI, machine and platform are also
 633  * shutdown.
 634  */
 635 static int soc_pcm_close(struct snd_pcm_substream *substream)
 636 {
 637         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 638         struct snd_soc_platform *platform = rtd->platform;
 639         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 640         struct snd_soc_dai *codec_dai;
 641         int i;
 642
 643         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 644
 645         snd_soc_runtime_deactivate(rtd, substream->stream);
 646
 647         /* clear the corresponding DAIs rate when inactive */
 648         if (!cpu_dai->active)
 649                 cpu_dai->rate = 0;
 650
 651         for (i = 0; i < rtd->num_codecs; i++) {
 652                 codec_dai = rtd->codec_dais[i];
 653                 if (!codec_dai->active)
 654                         codec_dai->rate = 0;
 655         }
 656
 657         if (cpu_dai->driver->ops->shutdown)
 658                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 659
 660         for (i = 0; i < rtd->num_codecs; i++) {
 661                 codec_dai = rtd->codec_dais[i];
 662                 if (codec_dai->driver->ops->shutdown)
 663                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 664         }
 665
 666         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 667                 rtd->dai_link->ops->shutdown(substream);
 668
 669         if (platform->driver->ops && platform->driver->ops->close)
 670                 platform->driver->ops->close(substream);
 671
 672         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 673                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
 674                         /* powered down playback stream now */
 675                         snd_soc_dapm_stream_event(rtd,
 676                                                   SNDRV_PCM_STREAM_PLAYBACK,
 677                                                   SND_SOC_DAPM_STREAM_STOP);
 678                 } else {
 679                         /* start delayed pop wq here for playback streams */
 680                         rtd->pop_wait = 1;
 681                         queue_delayed_work(system_power_efficient_wq,
 682                                            &rtd->delayed_work,
 683                                            msecs_to_jiffies(rtd->pmdown_time));
 684                 }
 685         } else {
 686                 /* capture streams can be powered down now */
 687                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 688                                           SND_SOC_DAPM_STREAM_STOP);
 689         }
 690
 691         mutex_unlock(&rtd->pcm_mutex);
 692
 693         pm_runtime_put(platform->dev);
 694         for (i = 0; i < rtd->num_codecs; i++)
 695                 pm_runtime_put(rtd->codec_dais[i]->dev);
 696         pm_runtime_put(cpu_dai->dev);
 697         for (i = 0; i < rtd->num_codecs; i++) {
 698                 if (!rtd->codec_dais[i]->active)
 699                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 700         }
 701         if (!cpu_dai->active)
 702                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 703
 704         return 0;
 705 }
 706
 707 /*
 708  * Called by ALSA when the PCM substream is prepared, can set format, sample
 709  * rate, etc.  This function is non atomic and can be called multiple times,
 710  * it can refer to the runtime info.
 711  */
 712 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 713 {
 714         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 715         struct snd_soc_platform *platform = rtd->platform;
 716         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 717         struct snd_soc_dai *codec_dai;
 718         int i, ret = 0;
 719
 720         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 721
 722         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 723                 ret = rtd->dai_link->ops->prepare(substream);
 724                 if (ret < 0) {
 725                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 726                                 " %d\n", ret);
 727                         goto out;
 728                 }
 729         }
 730
 731         if (platform->driver->ops && platform->driver->ops->prepare) {
 732                 ret = platform->driver->ops->prepare(substream);
 733                 if (ret < 0) {
 734                         dev_err(platform->dev, "ASoC: platform prepare error:"
 735                                 " %d\n", ret);
 736                         goto out;
 737                 }
 738         }
 739
 740         for (i = 0; i < rtd->num_codecs; i++) {
 741                 codec_dai = rtd->codec_dais[i];
 742                 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
 743                         ret = codec_dai->driver->ops->prepare(substream,
 744                                                               codec_dai);
 745                         if (ret < 0) {
 746                                 dev_err(codec_dai->dev,
 747                                         "ASoC: DAI prepare error: %d\n", ret);
 748                                 goto out;
 749                         }
 750                 }
 751         }
 752
 753         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 754                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 755                 if (ret < 0) {
 756                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
 757                                 ret);
 758                         goto out;
 759                 }
 760         }
 761
 762         /* cancel any delayed stream shutdown that is pending */
 763         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 764             rtd->pop_wait) {
 765                 rtd->pop_wait = 0;
 766                 cancel_delayed_work(&rtd->delayed_work);
 767         }
 768
 769         snd_soc_dapm_stream_event(rtd, substream->stream,
 770                         SND_SOC_DAPM_STREAM_START);
 771
 772         for (i = 0; i < rtd->num_codecs; i++)
 773                 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
 774                                          substream->stream);
 775
 776 out:
 777         mutex_unlock(&rtd->pcm_mutex);
 778         return ret;
 779 }
 780
 781 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 782                                        unsigned int mask)
 783 {
 784         struct snd_interval *interval;
 785         int channels = hweight_long(mask);
 786
 787         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 788         interval->min = channels;
 789         interval->max = channels;
 790 }
 791
 792 int soc_dai_hw_params(struct snd_pcm_substream *substream,
 793                       struct snd_pcm_hw_params *params,
 794                       struct snd_soc_dai *dai)
 795 {
 796         int ret;
 797
 798         if (dai->driver->ops && dai->driver->ops->hw_params) {
 799                 ret = dai->driver->ops->hw_params(substream, params, dai);
 800                 if (ret < 0) {
 801                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
 802                                 dai->name, ret);
 803                         return ret;
 804                 }
 805         }
 806
 807         return 0;
 808 }
 809
 810 /*
 811  * Called by ALSA when the hardware params are set by application. This
 812  * function can also be called multiple times and can allocate buffers
 813  * (using snd_pcm_lib_* ). It's non-atomic.
 814  */
 815 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 816                                 struct snd_pcm_hw_params *params)
 817 {
 818         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 819         struct snd_soc_platform *platform = rtd->platform;
 820         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 821         int i, ret = 0;
 822
 823         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 824
 825         ret = soc_pcm_params_symmetry(substream, params);
 826         if (ret)
 827                 goto out;
 828
 829         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 830                 ret = rtd->dai_link->ops->hw_params(substream, params);
 831                 if (ret < 0) {
 832                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 833                                 " failed: %d\n", ret);
 834                         goto out;
 835                 }
 836         }
 837
 838         for (i = 0; i < rtd->num_codecs; i++) {
 839                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 840                 struct snd_pcm_hw_params codec_params;
 841
 842                 /* copy params for each codec */
 843                 codec_params = *params;
 844
 845                 /* fixup params based on TDM slot masks */
 846                 if (codec_dai->tx_mask)
 847                         soc_pcm_codec_params_fixup(&codec_params,
 848                                                    codec_dai->tx_mask);
 849                 if (codec_dai->rx_mask)
 850                         soc_pcm_codec_params_fixup(&codec_params,
 851                                                    codec_dai->rx_mask);
 852
 853                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
 854                 if(ret < 0)
 855                         goto codec_err;
 856
 857                 codec_dai->rate = params_rate(&codec_params);
 858                 codec_dai->channels = params_channels(&codec_params);
 859                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 860                                                 params_format(&codec_params));
 861         }
 862
 863         ret = soc_dai_hw_params(substream, params, cpu_dai);
 864         if (ret < 0)
 865                 goto interface_err;
 866
 867         if (platform->driver->ops && platform->driver->ops->hw_params) {
 868                 ret = platform->driver->ops->hw_params(substream, params);
 869                 if (ret < 0) {
 870                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 871                                platform->component.name, ret);
 872                         goto platform_err;
 873                 }
 874         }
 875
 876         /* store the parameters for each DAIs */
 877         cpu_dai->rate = params_rate(params);
 878         cpu_dai->channels = params_channels(params);
 879         cpu_dai->sample_bits =
 880                 snd_pcm_format_physical_width(params_format(params));
 881
 882 out:
 883         mutex_unlock(&rtd->pcm_mutex);
 884         return ret;
 885
 886 platform_err:
 887         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 888                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 889
 890 interface_err:
 891         i = rtd->num_codecs;
 892
 893 codec_err:
 894         while (--i >= 0) {
 895                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 896                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 897                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 898                 codec_dai->rate = 0;
 899         }
 900
 901         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 902                 rtd->dai_link->ops->hw_free(substream);
 903
 904         mutex_unlock(&rtd->pcm_mutex);
 905         return ret;
 906 }
 907
 908 /*
 909  * Frees resources allocated by hw_params, can be called multiple times
 910  */
 911 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 912 {
 913         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 914         struct snd_soc_platform *platform = rtd->platform;
 915         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 916         struct snd_soc_dai *codec_dai;
 917         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 918         int i;
 919
 920         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 921
 922         /* clear the corresponding DAIs parameters when going to be inactive */
 923         if (cpu_dai->active == 1) {
 924                 cpu_dai->rate = 0;
 925                 cpu_dai->channels = 0;
 926                 cpu_dai->sample_bits = 0;
 927         }
 928
 929         for (i = 0; i < rtd->num_codecs; i++) {
 930                 codec_dai = rtd->codec_dais[i];
 931                 if (codec_dai->active == 1) {
 932                         codec_dai->rate = 0;
 933                         codec_dai->channels = 0;
 934                         codec_dai->sample_bits = 0;
 935                 }
 936         }
 937
 938         /* apply codec digital mute */
 939         for (i = 0; i < rtd->num_codecs; i++) {
 940                 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
 941                     (!playback && rtd->codec_dais[i]->capture_active == 1))
 942                         snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
 943                                                  substream->stream);
 944         }
 945
 946         /* free any machine hw params */
 947         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 948                 rtd->dai_link->ops->hw_free(substream);
 949
 950         /* free any DMA resources */
 951         if (platform->driver->ops && platform->driver->ops->hw_free)
 952                 platform->driver->ops->hw_free(substream);
 953
 954         /* now free hw params for the DAIs  */
 955         for (i = 0; i < rtd->num_codecs; i++) {
 956                 codec_dai = rtd->codec_dais[i];
 957                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 958                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 959         }
 960
 961         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 962                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 963
 964         mutex_unlock(&rtd->pcm_mutex);
 965         return 0;
 966 }
 967
 968 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 969 {
 970         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 971         struct snd_soc_platform *platform = rtd->platform;
 972         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 973         struct snd_soc_dai *codec_dai;
 974         int i, ret;
 975
 976         for (i = 0; i < rtd->num_codecs; i++) {
 977                 codec_dai = rtd->codec_dais[i];
 978                 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
 979                         ret = codec_dai->driver->ops->trigger(substream,
 980                                                               cmd, codec_dai);
 981                         if (ret < 0)
 982                                 return ret;
 983                 }
 984         }
 985
 986         if (platform->driver->ops && platform->driver->ops->trigger) {
 987                 ret = platform->driver->ops->trigger(substream, cmd);
 988                 if (ret < 0)
 989                         return ret;
 990         }
 991
 992         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
 993                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 994                 if (ret < 0)
 995                         return ret;
 996         }
 997
 998         if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
 999                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1000                 if (ret < 0)
1001                         return ret;
1002         }
1003
1004         return 0;
1005 }
1006
1007 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1008                                    int cmd)
1009 {
1010         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1011         struct snd_soc_platform *platform = rtd->platform;
1012         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1013         struct snd_soc_dai *codec_dai;
1014         int i, ret;
1015
1016         for (i = 0; i < rtd->num_codecs; i++) {
1017                 codec_dai = rtd->codec_dais[i];
1018                 if (codec_dai->driver->ops &&
1019                     codec_dai->driver->ops->bespoke_trigger) {
1020                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1021                                                                 cmd, codec_dai);
1022                         if (ret < 0)
1023                                 return ret;
1024                 }
1025         }
1026
1027         if (platform->driver->bespoke_trigger) {
1028                 ret = platform->driver->bespoke_trigger(substream, cmd);
1029                 if (ret < 0)
1030                         return ret;
1031         }
1032
1033         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1034                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1035                 if (ret < 0)
1036                         return ret;
1037         }
1038         return 0;
1039 }
1040 /*
1041  * soc level wrapper for pointer callback
1042  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1043  * the runtime->delay will be updated accordingly.
1044  */
1045 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1046 {
1047         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1048         struct snd_soc_platform *platform = rtd->platform;
1049         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1050         struct snd_soc_dai *codec_dai;
1051         struct snd_pcm_runtime *runtime = substream->runtime;
1052         snd_pcm_uframes_t offset = 0;
1053         snd_pcm_sframes_t delay = 0;
1054         snd_pcm_sframes_t codec_delay = 0;
1055         int i;
1056
1057         if (platform->driver->ops && platform->driver->ops->pointer)
1058                 offset = platform->driver->ops->pointer(substream);
1059
1060         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1061                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1062
1063         for (i = 0; i < rtd->num_codecs; i++) {
1064                 codec_dai = rtd->codec_dais[i];
1065                 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1066                         codec_delay = max(codec_delay,
1067                                         codec_dai->driver->ops->delay(substream,
1068                                                                     codec_dai));
1069         }
1070         delay += codec_delay;
1071
1072         /*
1073          * None of the existing platform drivers implement delay(), so
1074          * for now the codec_dai of first multicodec entry is used
1075          */
1076         if (platform->driver->delay)
1077                 delay += platform->driver->delay(substream, rtd->codec_dais[0]);
1078
1079         runtime->delay = delay;
1080
1081         return offset;
1082 }
1083
1084 /* connect a FE and BE */
1085 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1086                 struct snd_soc_pcm_runtime *be, int stream)
1087 {
1088         struct snd_soc_dpcm *dpcm;
1089
1090         /* only add new dpcms */
1091         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1092                 if (dpcm->be == be && dpcm->fe == fe)
1093                         return 0;
1094         }
1095
1096         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1097         if (!dpcm)
1098                 return -ENOMEM;
1099
1100         dpcm->be = be;
1101         dpcm->fe = fe;
1102         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1103         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1104         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1105         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1106
1107         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1108                         stream ? "capture" : "playback",  fe->dai_link->name,
1109                         stream ? "<-" : "->", be->dai_link->name);
1110
1111 #ifdef CONFIG_DEBUG_FS
1112         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1113                         fe->debugfs_dpcm_root, &dpcm->state);
1114 #endif
1115         return 1;
1116 }
1117
1118 /* reparent a BE onto another FE */
1119 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1120                         struct snd_soc_pcm_runtime *be, int stream)
1121 {
1122         struct snd_soc_dpcm *dpcm;
1123         struct snd_pcm_substream *fe_substream, *be_substream;
1124
1125         /* reparent if BE is connected to other FEs */
1126         if (!be->dpcm[stream].users)
1127                 return;
1128
1129         be_substream = snd_soc_dpcm_get_substream(be, stream);
1130
1131         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1132                 if (dpcm->fe == fe)
1133                         continue;
1134
1135                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1136                         stream ? "capture" : "playback",
1137                         dpcm->fe->dai_link->name,
1138                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1139
1140                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1141                 be_substream->runtime = fe_substream->runtime;
1142                 break;
1143         }
1144 }
1145
1146 /* disconnect a BE and FE */
1147 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1148 {
1149         struct snd_soc_dpcm *dpcm, *d;
1150
1151         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1152                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1153                                 stream ? "capture" : "playback",
1154                                 dpcm->be->dai_link->name);
1155
1156                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1157                         continue;
1158
1159                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1160                         stream ? "capture" : "playback", fe->dai_link->name,
1161                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1162
1163                 /* BEs still alive need new FE */
1164                 dpcm_be_reparent(fe, dpcm->be, stream);
1165
1166 #ifdef CONFIG_DEBUG_FS
1167                 debugfs_remove(dpcm->debugfs_state);
1168 #endif
1169                 list_del(&dpcm->list_be);
1170                 list_del(&dpcm->list_fe);
1171                 kfree(dpcm);
1172         }
1173 }
1174
1175 /* get BE for DAI widget and stream */
1176 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1177                 struct snd_soc_dapm_widget *widget, int stream)
1178 {
1179         struct snd_soc_pcm_runtime *be;
1180         int i, j;
1181
1182         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1183                 for (i = 0; i < card->num_links; i++) {
1184                         be = &card->rtd[i];
1185
1186                         if (!be->dai_link->no_pcm)
1187                                 continue;
1188
1189                         if (be->cpu_dai->playback_widget == widget)
1190                                 return be;
1191
1192                         for (j = 0; j < be->num_codecs; j++) {
1193                                 struct snd_soc_dai *dai = be->codec_dais[j];
1194                                 if (dai->playback_widget == widget)
1195                                         return be;
1196                         }
1197                 }
1198         } else {
1199
1200                 for (i = 0; i < card->num_links; i++) {
1201                         be = &card->rtd[i];
1202
1203                         if (!be->dai_link->no_pcm)
1204                                 continue;
1205
1206                         if (be->cpu_dai->capture_widget == widget)
1207                                 return be;
1208
1209                         for (j = 0; j < be->num_codecs; j++) {
1210                                 struct snd_soc_dai *dai = be->codec_dais[j];
1211                                 if (dai->capture_widget == widget)
1212                                         return be;
1213                         }
1214                 }
1215         }
1216
1217         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1218                 stream ? "capture" : "playback", widget->name);
1219         return NULL;
1220 }
1221
1222 static inline struct snd_soc_dapm_widget *
1223         dai_get_widget(struct snd_soc_dai *dai, int stream)
1224 {
1225         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1226                 return dai->playback_widget;
1227         else
1228                 return dai->capture_widget;
1229 }
1230
1231 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1232                 struct snd_soc_dapm_widget *widget)
1233 {
1234         int i;
1235
1236         for (i = 0; i < list->num_widgets; i++) {
1237                 if (widget == list->widgets[i])
1238                         return 1;
1239         }
1240
1241         return 0;
1242 }
1243
1244 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1245         int stream, struct snd_soc_dapm_widget_list **list_)
1246 {
1247         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1248         struct snd_soc_dapm_widget_list *list;
1249         int paths;
1250
1251         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
1252                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
1253         if (list == NULL)
1254                 return -ENOMEM;
1255
1256         /* get number of valid DAI paths and their widgets */
1257         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
1258
1259         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1260                         stream ? "capture" : "playback");
1261
1262         *list_ = list;
1263         return paths;
1264 }
1265
1266 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1267         struct snd_soc_dapm_widget_list **list_)
1268 {
1269         struct snd_soc_dpcm *dpcm;
1270         struct snd_soc_dapm_widget_list *list = *list_;
1271         struct snd_soc_dapm_widget *widget;
1272         int prune = 0;
1273
1274         /* Destroy any old FE <--> BE connections */
1275         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1276                 unsigned int i;
1277
1278                 /* is there a valid CPU DAI widget for this BE */
1279                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1280
1281                 /* prune the BE if it's no longer in our active list */
1282                 if (widget && widget_in_list(list, widget))
1283                         continue;
1284
1285                 /* is there a valid CODEC DAI widget for this BE */
1286                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1287                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1288                         widget = dai_get_widget(dai, stream);
1289
1290                         /* prune the BE if it's no longer in our active list */
1291                         if (widget && widget_in_list(list, widget))
1292                                 continue;
1293                 }
1294
1295                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1296                         stream ? "capture" : "playback",
1297                         dpcm->be->dai_link->name, fe->dai_link->name);
1298                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1299                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1300                 prune++;
1301         }
1302
1303         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1304         return prune;
1305 }
1306
1307 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1308         struct snd_soc_dapm_widget_list **list_)
1309 {
1310         struct snd_soc_card *card = fe->card;
1311         struct snd_soc_dapm_widget_list *list = *list_;
1312         struct snd_soc_pcm_runtime *be;
1313         int i, new = 0, err;
1314
1315         /* Create any new FE <--> BE connections */
1316         for (i = 0; i < list->num_widgets; i++) {
1317
1318                 switch (list->widgets[i]->id) {
1319                 case snd_soc_dapm_dai_in:
1320                 case snd_soc_dapm_dai_out:
1321                         break;
1322                 default:
1323                         continue;
1324                 }
1325
1326                 /* is there a valid BE rtd for this widget */
1327                 be = dpcm_get_be(card, list->widgets[i], stream);
1328                 if (!be) {
1329                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1330                                         list->widgets[i]->name);
1331                         continue;
1332                 }
1333
1334                 /* make sure BE is a real BE */
1335                 if (!be->dai_link->no_pcm)
1336                         continue;
1337
1338                 /* don't connect if FE is not running */
1339                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1340                         continue;
1341
1342                 /* newly connected FE and BE */
1343                 err = dpcm_be_connect(fe, be, stream);
1344                 if (err < 0) {
1345                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1346                                 list->widgets[i]->name);
1347                         break;
1348                 } else if (err == 0) /* already connected */
1349                         continue;
1350
1351                 /* new */
1352                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1353                 new++;
1354         }
1355
1356         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1357         return new;
1358 }
1359
1360 /*
1361  * Find the corresponding BE DAIs that source or sink audio to this
1362  * FE substream.
1363  */
1364 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1365         int stream, struct snd_soc_dapm_widget_list **list, int new)
1366 {
1367         if (new)
1368                 return dpcm_add_paths(fe, stream, list);
1369         else
1370                 return dpcm_prune_paths(fe, stream, list);
1371 }
1372
1373 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1374 {
1375         struct snd_soc_dpcm *dpcm;
1376
1377         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1378                 dpcm->be->dpcm[stream].runtime_update =
1379                                                 SND_SOC_DPCM_UPDATE_NO;
1380 }
1381
1382 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1383         int stream)
1384 {
1385         struct snd_soc_dpcm *dpcm;
1386
1387         /* disable any enabled and non active backends */
1388         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1389
1390                 struct snd_soc_pcm_runtime *be = dpcm->be;
1391                 struct snd_pcm_substream *be_substream =
1392                         snd_soc_dpcm_get_substream(be, stream);
1393
1394                 if (be->dpcm[stream].users == 0)
1395                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1396                                 stream ? "capture" : "playback",
1397                                 be->dpcm[stream].state);
1398
1399                 if (--be->dpcm[stream].users != 0)
1400                         continue;
1401
1402                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1403                         continue;
1404
1405                 soc_pcm_close(be_substream);
1406                 be_substream->runtime = NULL;
1407                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1408         }
1409 }
1410
1411 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1412 {
1413         struct snd_soc_dpcm *dpcm;
1414         int err, count = 0;
1415
1416         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1417         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1418
1419                 struct snd_soc_pcm_runtime *be = dpcm->be;
1420                 struct snd_pcm_substream *be_substream =
1421                         snd_soc_dpcm_get_substream(be, stream);
1422
1423                 if (!be_substream) {
1424                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1425                                 stream ? "capture" : "playback");
1426                         continue;
1427                 }
1428
1429                 /* is this op for this BE ? */
1430                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1431                         continue;
1432
1433                 /* first time the dpcm is open ? */
1434                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1435                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1436                                 stream ? "capture" : "playback",
1437                                 be->dpcm[stream].state);
1438
1439                 if (be->dpcm[stream].users++ != 0)
1440                         continue;
1441
1442                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1443                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1444                         continue;
1445
1446                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1447                         stream ? "capture" : "playback", be->dai_link->name);
1448
1449                 be_substream->runtime = be->dpcm[stream].runtime;
1450                 err = soc_pcm_open(be_substream);
1451                 if (err < 0) {
1452                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1453                         be->dpcm[stream].users--;
1454                         if (be->dpcm[stream].users < 0)
1455                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1456                                         stream ? "capture" : "playback",
1457                                         be->dpcm[stream].state);
1458
1459                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1460                         goto unwind;
1461                 }
1462
1463                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1464                 count++;
1465         }
1466
1467         return count;
1468
1469 unwind:
1470         /* disable any enabled and non active backends */
1471         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1472                 struct snd_soc_pcm_runtime *be = dpcm->be;
1473                 struct snd_pcm_substream *be_substream =
1474                         snd_soc_dpcm_get_substream(be, stream);
1475
1476                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1477                         continue;
1478
1479                 if (be->dpcm[stream].users == 0)
1480                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1481                                 stream ? "capture" : "playback",
1482                                 be->dpcm[stream].state);
1483
1484                 if (--be->dpcm[stream].users != 0)
1485                         continue;
1486
1487                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1488                         continue;
1489
1490                 soc_pcm_close(be_substream);
1491                 be_substream->runtime = NULL;
1492                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1493         }
1494
1495         return err;
1496 }
1497
1498 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1499         struct snd_soc_pcm_stream *stream)
1500 {
1501         runtime->hw.rate_min = stream->rate_min;
1502         runtime->hw.rate_max = stream->rate_max;
1503         runtime->hw.channels_min = stream->channels_min;
1504         runtime->hw.channels_max = stream->channels_max;
1505         if (runtime->hw.formats)
1506                 runtime->hw.formats &= stream->formats;
1507         else
1508                 runtime->hw.formats = stream->formats;
1509         runtime->hw.rates = stream->rates;
1510 }
1511
1512 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1513 {
1514         struct snd_pcm_runtime *runtime = substream->runtime;
1515         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1516         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1517         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1518
1519         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1520                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback);
1521         else
1522                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture);
1523 }
1524
1525 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1526 {
1527         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1528         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1529         int stream = fe_substream->stream, ret = 0;
1530
1531         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1532
1533         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1534         if (ret < 0) {
1535                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1536                 goto be_err;
1537         }
1538
1539         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1540
1541         /* start the DAI frontend */
1542         ret = soc_pcm_open(fe_substream);
1543         if (ret < 0) {
1544                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1545                 goto unwind;
1546         }
1547
1548         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1549
1550         dpcm_set_fe_runtime(fe_substream);
1551         snd_pcm_limit_hw_rates(runtime);
1552
1553         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1554         return 0;
1555
1556 unwind:
1557         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1558 be_err:
1559         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1560         return ret;
1561 }
1562
1563 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1564 {
1565         struct snd_soc_dpcm *dpcm;
1566
1567         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1568         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1569
1570                 struct snd_soc_pcm_runtime *be = dpcm->be;
1571                 struct snd_pcm_substream *be_substream =
1572                         snd_soc_dpcm_get_substream(be, stream);
1573
1574                 /* is this op for this BE ? */
1575                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1576                         continue;
1577
1578                 if (be->dpcm[stream].users == 0)
1579                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1580                                 stream ? "capture" : "playback",
1581                                 be->dpcm[stream].state);
1582
1583                 if (--be->dpcm[stream].users != 0)
1584                         continue;
1585
1586                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1587                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1588                         continue;
1589
1590                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1591                         dpcm->fe->dai_link->name);
1592
1593                 soc_pcm_close(be_substream);
1594                 be_substream->runtime = NULL;
1595
1596                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1597         }
1598         return 0;
1599 }
1600
1601 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1602 {
1603         struct snd_soc_pcm_runtime *fe = substream->private_data;
1604         int stream = substream->stream;
1605
1606         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1607
1608         /* shutdown the BEs */
1609         dpcm_be_dai_shutdown(fe, substream->stream);
1610
1611         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1612
1613         /* now shutdown the frontend */
1614         soc_pcm_close(substream);
1615
1616         /* run the stream event for each BE */
1617         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1618
1619         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1620         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1621         return 0;
1622 }
1623
1624 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1625 {
1626         struct snd_soc_dpcm *dpcm;
1627
1628         /* only hw_params backends that are either sinks or sources
1629          * to this frontend DAI */
1630         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1631
1632                 struct snd_soc_pcm_runtime *be = dpcm->be;
1633                 struct snd_pcm_substream *be_substream =
1634                         snd_soc_dpcm_get_substream(be, stream);
1635
1636                 /* is this op for this BE ? */
1637                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1638                         continue;
1639
1640                 /* only free hw when no longer used - check all FEs */
1641                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1642                                 continue;
1643
1644                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1645                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1646                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1647                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1648                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1649                         continue;
1650
1651                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1652                         dpcm->fe->dai_link->name);
1653
1654                 soc_pcm_hw_free(be_substream);
1655
1656                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1657         }
1658
1659         return 0;
1660 }
1661
1662 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1663 {
1664         struct snd_soc_pcm_runtime *fe = substream->private_data;
1665         int err, stream = substream->stream;
1666
1667         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1668         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1669
1670         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1671
1672         /* call hw_free on the frontend */
1673         err = soc_pcm_hw_free(substream);
1674         if (err < 0)
1675                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1676                         fe->dai_link->name);
1677
1678         /* only hw_params backends that are either sinks or sources
1679          * to this frontend DAI */
1680         err = dpcm_be_dai_hw_free(fe, stream);
1681
1682         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1683         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1684
1685         mutex_unlock(&fe->card->mutex);
1686         return 0;
1687 }
1688
1689 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1690 {
1691         struct snd_soc_dpcm *dpcm;
1692         int ret;
1693
1694         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1695
1696                 struct snd_soc_pcm_runtime *be = dpcm->be;
1697                 struct snd_pcm_substream *be_substream =
1698                         snd_soc_dpcm_get_substream(be, stream);
1699
1700                 /* is this op for this BE ? */
1701                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1702                         continue;
1703
1704                 /* only allow hw_params() if no connected FEs are running */
1705                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1706                         continue;
1707
1708                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1709                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1710                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1711                         continue;
1712
1713                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1714                         dpcm->fe->dai_link->name);
1715
1716                 /* copy params for each dpcm */
1717                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1718                                 sizeof(struct snd_pcm_hw_params));
1719
1720                 /* perform any hw_params fixups */
1721                 if (be->dai_link->be_hw_params_fixup) {
1722                         ret = be->dai_link->be_hw_params_fixup(be,
1723                                         &dpcm->hw_params);
1724                         if (ret < 0) {
1725                                 dev_err(be->dev,
1726                                         "ASoC: hw_params BE fixup failed %d\n",
1727                                         ret);
1728                                 goto unwind;
1729                         }
1730                 }
1731
1732                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1733                 if (ret < 0) {
1734                         dev_err(dpcm->be->dev,
1735                                 "ASoC: hw_params BE failed %d\n", ret);
1736                         goto unwind;
1737                 }
1738
1739                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1740         }
1741         return 0;
1742
1743 unwind:
1744         /* disable any enabled and non active backends */
1745         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1746                 struct snd_soc_pcm_runtime *be = dpcm->be;
1747                 struct snd_pcm_substream *be_substream =
1748                         snd_soc_dpcm_get_substream(be, stream);
1749
1750                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1751                         continue;
1752
1753                 /* only allow hw_free() if no connected FEs are running */
1754                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1755                         continue;
1756
1757                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1758                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1759                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1760                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1761                         continue;
1762
1763                 soc_pcm_hw_free(be_substream);
1764         }
1765
1766         return ret;
1767 }
1768
1769 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1770                                  struct snd_pcm_hw_params *params)
1771 {
1772         struct snd_soc_pcm_runtime *fe = substream->private_data;
1773         int ret, stream = substream->stream;
1774
1775         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1776         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1777
1778         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1779                         sizeof(struct snd_pcm_hw_params));
1780         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1781         if (ret < 0) {
1782                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1783                 goto out;
1784         }
1785
1786         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1787                         fe->dai_link->name, params_rate(params),
1788                         params_channels(params), params_format(params));
1789
1790         /* call hw_params on the frontend */
1791         ret = soc_pcm_hw_params(substream, params);
1792         if (ret < 0) {
1793                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1794                 dpcm_be_dai_hw_free(fe, stream);
1795          } else
1796                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1797
1798 out:
1799         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1800         mutex_unlock(&fe->card->mutex);
1801         return ret;
1802 }
1803
1804 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1805                 struct snd_pcm_substream *substream, int cmd)
1806 {
1807         int ret;
1808
1809         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1810                         dpcm->fe->dai_link->name, cmd);
1811
1812         ret = soc_pcm_trigger(substream, cmd);
1813         if (ret < 0)
1814                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1815
1816         return ret;
1817 }
1818
1819 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1820                                int cmd)
1821 {
1822         struct snd_soc_dpcm *dpcm;
1823         int ret = 0;
1824
1825         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1826
1827                 struct snd_soc_pcm_runtime *be = dpcm->be;
1828                 struct snd_pcm_substream *be_substream =
1829                         snd_soc_dpcm_get_substream(be, stream);
1830
1831                 /* is this op for this BE ? */
1832                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1833                         continue;
1834
1835                 switch (cmd) {
1836                 case SNDRV_PCM_TRIGGER_START:
1837                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1838                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1839                                 continue;
1840
1841                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1842                         if (ret)
1843                                 return ret;
1844
1845                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1846                         break;
1847                 case SNDRV_PCM_TRIGGER_RESUME:
1848                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1849                                 continue;
1850
1851                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1852                         if (ret)
1853                                 return ret;
1854
1855                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1856                         break;
1857                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1858                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1859                                 continue;
1860
1861                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1862                         if (ret)
1863                                 return ret;
1864
1865                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1866                         break;
1867                 case SNDRV_PCM_TRIGGER_STOP:
1868                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1869                                 continue;
1870
1871                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1872                                 continue;
1873
1874                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1875                         if (ret)
1876                                 return ret;
1877
1878                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1879                         break;
1880                 case SNDRV_PCM_TRIGGER_SUSPEND:
1881                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1882                                 continue;
1883
1884                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1885                                 continue;
1886
1887                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1888                         if (ret)
1889                                 return ret;
1890
1891                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1892                         break;
1893                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1894                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1895                                 continue;
1896
1897                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1898                                 continue;
1899
1900                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1901                         if (ret)
1902                                 return ret;
1903
1904                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1905                         break;
1906                 }
1907         }
1908
1909         return ret;
1910 }
1911 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1912
1913 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1914 {
1915         struct snd_soc_pcm_runtime *fe = substream->private_data;
1916         int stream = substream->stream, ret;
1917         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1918
1919         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1920
1921         switch (trigger) {
1922         case SND_SOC_DPCM_TRIGGER_PRE:
1923                 /* call trigger on the frontend before the backend. */
1924
1925                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1926                                 fe->dai_link->name, cmd);
1927
1928                 ret = soc_pcm_trigger(substream, cmd);
1929                 if (ret < 0) {
1930                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1931                         goto out;
1932                 }
1933
1934                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1935                 break;
1936         case SND_SOC_DPCM_TRIGGER_POST:
1937                 /* call trigger on the frontend after the backend. */
1938
1939                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1940                 if (ret < 0) {
1941                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1942                         goto out;
1943                 }
1944
1945                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1946                                 fe->dai_link->name, cmd);
1947
1948                 ret = soc_pcm_trigger(substream, cmd);
1949                 break;
1950         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1951                 /* bespoke trigger() - handles both FE and BEs */
1952
1953                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1954                                 fe->dai_link->name, cmd);
1955
1956                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1957                 if (ret < 0) {
1958                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1959                         goto out;
1960                 }
1961                 break;
1962         default:
1963                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1964                                 fe->dai_link->name);
1965                 ret = -EINVAL;
1966                 goto out;
1967         }
1968
1969         switch (cmd) {
1970         case SNDRV_PCM_TRIGGER_START:
1971         case SNDRV_PCM_TRIGGER_RESUME:
1972         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1973                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1974                 break;
1975         case SNDRV_PCM_TRIGGER_STOP:
1976         case SNDRV_PCM_TRIGGER_SUSPEND:
1977         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1978                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1979                 break;
1980         }
1981
1982 out:
1983         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1984         return ret;
1985 }
1986
1987 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1988 {
1989         struct snd_soc_dpcm *dpcm;
1990         int ret = 0;
1991
1992         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1993
1994                 struct snd_soc_pcm_runtime *be = dpcm->be;
1995                 struct snd_pcm_substream *be_substream =
1996                         snd_soc_dpcm_get_substream(be, stream);
1997
1998                 /* is this op for this BE ? */
1999                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2000                         continue;
2001
2002                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2003                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2004                         continue;
2005
2006                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2007                         dpcm->fe->dai_link->name);
2008
2009                 ret = soc_pcm_prepare(be_substream);
2010                 if (ret < 0) {
2011                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2012                                 ret);
2013                         break;
2014                 }
2015
2016                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2017         }
2018         return ret;
2019 }
2020
2021 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2022 {
2023         struct snd_soc_pcm_runtime *fe = substream->private_data;
2024         int stream = substream->stream, ret = 0;
2025
2026         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2027
2028         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2029
2030         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2031
2032         /* there is no point preparing this FE if there are no BEs */
2033         if (list_empty(&fe->dpcm[stream].be_clients)) {
2034                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2035                                 fe->dai_link->name);
2036                 ret = -EINVAL;
2037                 goto out;
2038         }
2039
2040         ret = dpcm_be_dai_prepare(fe, substream->stream);
2041         if (ret < 0)
2042                 goto out;
2043
2044         /* call prepare on the frontend */
2045         ret = soc_pcm_prepare(substream);
2046         if (ret < 0) {
2047                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2048                         fe->dai_link->name);
2049                 goto out;
2050         }
2051
2052         /* run the stream event for each BE */
2053         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2054         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2055
2056 out:
2057         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2058         mutex_unlock(&fe->card->mutex);
2059
2060         return ret;
2061 }
2062
2063 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2064                      unsigned int cmd, void *arg)
2065 {
2066         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2067         struct snd_soc_platform *platform = rtd->platform;
2068
2069         if (platform->driver->ops && platform->driver->ops->ioctl)
2070                 return platform->driver->ops->ioctl(substream, cmd, arg);
2071         return snd_pcm_lib_ioctl(substream, cmd, arg);
2072 }
2073
2074 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2075 {
2076         struct snd_pcm_substream *substream =
2077                 snd_soc_dpcm_get_substream(fe, stream);
2078         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2079         int err;
2080
2081         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2082                         stream ? "capture" : "playback", fe->dai_link->name);
2083
2084         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2085                 /* call bespoke trigger - FE takes care of all BE triggers */
2086                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2087                                 fe->dai_link->name);
2088
2089                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2090                 if (err < 0)
2091                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2092         } else {
2093                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2094                         fe->dai_link->name);
2095
2096                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2097                 if (err < 0)
2098                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2099         }
2100
2101         err = dpcm_be_dai_hw_free(fe, stream);
2102         if (err < 0)
2103                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2104
2105         err = dpcm_be_dai_shutdown(fe, stream);
2106         if (err < 0)
2107                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2108
2109         /* run the stream event for each BE */
2110         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2111
2112         return 0;
2113 }
2114
2115 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2116 {
2117         struct snd_pcm_substream *substream =
2118                 snd_soc_dpcm_get_substream(fe, stream);
2119         struct snd_soc_dpcm *dpcm;
2120         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2121         int ret;
2122
2123         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2124                         stream ? "capture" : "playback", fe->dai_link->name);
2125
2126         /* Only start the BE if the FE is ready */
2127         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2128                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2129                 return -EINVAL;
2130
2131         /* startup must always be called for new BEs */
2132         ret = dpcm_be_dai_startup(fe, stream);
2133         if (ret < 0)
2134                 goto disconnect;
2135
2136         /* keep going if FE state is > open */
2137         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2138                 return 0;
2139
2140         ret = dpcm_be_dai_hw_params(fe, stream);
2141         if (ret < 0)
2142                 goto close;
2143
2144         /* keep going if FE state is > hw_params */
2145         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2146                 return 0;
2147
2148
2149         ret = dpcm_be_dai_prepare(fe, stream);
2150         if (ret < 0)
2151                 goto hw_free;
2152
2153         /* run the stream event for each BE */
2154         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2155
2156         /* keep going if FE state is > prepare */
2157         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2158                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2159                 return 0;
2160
2161         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2162                 /* call trigger on the frontend - FE takes care of all BE triggers */
2163                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2164                                 fe->dai_link->name);
2165
2166                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2167                 if (ret < 0) {
2168                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2169                         goto hw_free;
2170                 }
2171         } else {
2172                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2173                         fe->dai_link->name);
2174
2175                 ret = dpcm_be_dai_trigger(fe, stream,
2176                                         SNDRV_PCM_TRIGGER_START);
2177                 if (ret < 0) {
2178                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2179                         goto hw_free;
2180                 }
2181         }
2182
2183         return 0;
2184
2185 hw_free:
2186         dpcm_be_dai_hw_free(fe, stream);
2187 close:
2188         dpcm_be_dai_shutdown(fe, stream);
2189 disconnect:
2190         /* disconnect any non started BEs */
2191         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2192                 struct snd_soc_pcm_runtime *be = dpcm->be;
2193                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2194                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2195         }
2196
2197         return ret;
2198 }
2199
2200 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2201 {
2202         int ret;
2203
2204         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
2205         ret = dpcm_run_update_startup(fe, stream);
2206         if (ret < 0)
2207                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2208         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2209
2210         return ret;
2211 }
2212
2213 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2214 {
2215         int ret;
2216
2217         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
2218         ret = dpcm_run_update_shutdown(fe, stream);
2219         if (ret < 0)
2220                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2221         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2222
2223         return ret;
2224 }
2225
2226 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2227  * any DAI links.
2228  */
2229 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2230 {
2231         int i, old, new, paths;
2232
2233         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2234         for (i = 0; i < card->num_rtd; i++) {
2235                 struct snd_soc_dapm_widget_list *list;
2236                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
2237
2238                 /* make sure link is FE */
2239                 if (!fe->dai_link->dynamic)
2240                         continue;
2241
2242                 /* only check active links */
2243                 if (!fe->cpu_dai->active)
2244                         continue;
2245
2246                 /* DAPM sync will call this to update DSP paths */
2247                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2248                         fe->dai_link->name);
2249
2250                 /* skip if FE doesn't have playback capability */
2251                 if (!fe->cpu_dai->driver->playback.channels_min)
2252                         goto capture;
2253
2254                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2255                 if (paths < 0) {
2256                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2257                                         fe->dai_link->name,  "playback");
2258                         mutex_unlock(&card->mutex);
2259                         return paths;
2260                 }
2261
2262                 /* update any new playback paths */
2263                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2264                 if (new) {
2265                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2266                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2267                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2268                 }
2269
2270                 /* update any old playback paths */
2271                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2272                 if (old) {
2273                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2274                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2275                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2276                 }
2277
2278                 dpcm_path_put(&list);
2279 capture:
2280                 /* skip if FE doesn't have capture capability */
2281                 if (!fe->cpu_dai->driver->capture.channels_min)
2282                         continue;
2283
2284                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2285                 if (paths < 0) {
2286                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2287                                         fe->dai_link->name,  "capture");
2288                         mutex_unlock(&card->mutex);
2289                         return paths;
2290                 }
2291
2292                 /* update any new capture paths */
2293                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2294                 if (new) {
2295                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2296                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2297                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2298                 }
2299
2300                 /* update any old capture paths */
2301                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2302                 if (old) {
2303                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2304                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2305                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2306                 }
2307
2308                 dpcm_path_put(&list);
2309         }
2310
2311         mutex_unlock(&card->mutex);
2312         return 0;
2313 }
2314 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2315 {
2316         struct snd_soc_dpcm *dpcm;
2317         struct list_head *clients =
2318                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2319
2320         list_for_each_entry(dpcm, clients, list_be) {
2321
2322                 struct snd_soc_pcm_runtime *be = dpcm->be;
2323                 int i;
2324
2325                 if (be->dai_link->ignore_suspend)
2326                         continue;
2327
2328                 for (i = 0; i < be->num_codecs; i++) {
2329                         struct snd_soc_dai *dai = be->codec_dais[i];
2330                         struct snd_soc_dai_driver *drv = dai->driver;
2331
2332                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2333                                          be->dai_link->name);
2334
2335                         if (drv->ops && drv->ops->digital_mute &&
2336                                                         dai->playback_active)
2337                                 drv->ops->digital_mute(dai, mute);
2338                 }
2339         }
2340
2341         return 0;
2342 }
2343
2344 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2345 {
2346         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2347         struct snd_soc_dpcm *dpcm;
2348         struct snd_soc_dapm_widget_list *list;
2349         int ret;
2350         int stream = fe_substream->stream;
2351
2352         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2353         fe->dpcm[stream].runtime = fe_substream->runtime;
2354
2355         ret = dpcm_path_get(fe, stream, &list);
2356         if (ret < 0) {
2357                 mutex_unlock(&fe->card->mutex);
2358                 return ret;
2359         } else if (ret == 0) {
2360                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2361                         fe->dai_link->name, stream ? "capture" : "playback");
2362         }
2363
2364         /* calculate valid and active FE <-> BE dpcms */
2365         dpcm_process_paths(fe, stream, &list, 1);
2366
2367         ret = dpcm_fe_dai_startup(fe_substream);
2368         if (ret < 0) {
2369                 /* clean up all links */
2370                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2371                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2372
2373                 dpcm_be_disconnect(fe, stream);
2374                 fe->dpcm[stream].runtime = NULL;
2375         }
2376
2377         dpcm_clear_pending_state(fe, stream);
2378         dpcm_path_put(&list);
2379         mutex_unlock(&fe->card->mutex);
2380         return ret;
2381 }
2382
2383 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2384 {
2385         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2386         struct snd_soc_dpcm *dpcm;
2387         int stream = fe_substream->stream, ret;
2388
2389         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2390         ret = dpcm_fe_dai_shutdown(fe_substream);
2391
2392         /* mark FE's links ready to prune */
2393         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2394                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2395
2396         dpcm_be_disconnect(fe, stream);
2397
2398         fe->dpcm[stream].runtime = NULL;
2399         mutex_unlock(&fe->card->mutex);
2400         return ret;
2401 }
2402
2403 /* create a new pcm */
2404 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2405 {
2406         struct snd_soc_platform *platform = rtd->platform;
2407         struct snd_soc_dai *codec_dai;
2408         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2409         struct snd_pcm *pcm;
2410         char new_name[64];
2411         int ret = 0, playback = 0, capture = 0;
2412         int i;
2413
2414         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2415                 playback = rtd->dai_link->dpcm_playback;
2416                 capture = rtd->dai_link->dpcm_capture;
2417         } else {
2418                 for (i = 0; i < rtd->num_codecs; i++) {
2419                         codec_dai = rtd->codec_dais[i];
2420                         if (codec_dai->driver->playback.channels_min)
2421                                 playback = 1;
2422                         if (codec_dai->driver->capture.channels_min)
2423                                 capture = 1;
2424                 }
2425
2426                 capture = capture && cpu_dai->driver->capture.channels_min;
2427                 playback = playback && cpu_dai->driver->playback.channels_min;
2428         }
2429
2430         if (rtd->dai_link->playback_only) {
2431                 playback = 1;
2432                 capture = 0;
2433         }
2434
2435         if (rtd->dai_link->capture_only) {
2436                 playback = 0;
2437                 capture = 1;
2438         }
2439
2440         /* create the PCM */
2441         if (rtd->dai_link->no_pcm) {
2442                 snprintf(new_name, sizeof(new_name), "(%s)",
2443                         rtd->dai_link->stream_name);
2444
2445                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2446                                 playback, capture, &pcm);
2447         } else {
2448                 if (rtd->dai_link->dynamic)
2449                         snprintf(new_name, sizeof(new_name), "%s (*)",
2450                                 rtd->dai_link->stream_name);
2451                 else
2452                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2453                                 rtd->dai_link->stream_name,
2454                                 (rtd->num_codecs > 1) ?
2455                                 "multicodec" : rtd->codec_dai->name, num);
2456
2457                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2458                         capture, &pcm);
2459         }
2460         if (ret < 0) {
2461                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2462                         rtd->dai_link->name);
2463                 return ret;
2464         }
2465         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2466
2467         /* DAPM dai link stream work */
2468         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2469
2470         rtd->pcm = pcm;
2471         pcm->private_data = rtd;
2472
2473         if (rtd->dai_link->no_pcm) {
2474                 if (playback)
2475                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2476                 if (capture)
2477                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2478                 goto out;
2479         }
2480
2481         /* ASoC PCM operations */
2482         if (rtd->dai_link->dynamic) {
2483                 rtd->ops.open           = dpcm_fe_dai_open;
2484                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2485                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2486                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2487                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2488                 rtd->ops.close          = dpcm_fe_dai_close;
2489                 rtd->ops.pointer        = soc_pcm_pointer;
2490                 rtd->ops.ioctl          = soc_pcm_ioctl;
2491         } else {
2492                 rtd->ops.open           = soc_pcm_open;
2493                 rtd->ops.hw_params      = soc_pcm_hw_params;
2494                 rtd->ops.prepare        = soc_pcm_prepare;
2495                 rtd->ops.trigger        = soc_pcm_trigger;
2496                 rtd->ops.hw_free        = soc_pcm_hw_free;
2497                 rtd->ops.close          = soc_pcm_close;
2498                 rtd->ops.pointer        = soc_pcm_pointer;
2499                 rtd->ops.ioctl          = soc_pcm_ioctl;
2500         }
2501
2502         if (platform->driver->ops) {
2503                 rtd->ops.ack            = platform->driver->ops->ack;
2504                 rtd->ops.copy           = platform->driver->ops->copy;
2505                 rtd->ops.silence        = platform->driver->ops->silence;
2506                 rtd->ops.page           = platform->driver->ops->page;
2507                 rtd->ops.mmap           = platform->driver->ops->mmap;
2508         }
2509
2510         if (playback)
2511                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2512
2513         if (capture)
2514                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2515
2516         if (platform->driver->pcm_new) {
2517                 ret = platform->driver->pcm_new(rtd);
2518                 if (ret < 0) {
2519                         dev_err(platform->dev,
2520                                 "ASoC: pcm constructor failed: %d\n",
2521                                 ret);
2522                         return ret;
2523                 }
2524         }
2525
2526         pcm->private_free = platform->driver->pcm_free;
2527 out:
2528         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2529                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2530                  cpu_dai->name);
2531         return ret;
2532 }
2533
2534 /* is the current PCM operation for this FE ? */
2535 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2536 {
2537         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2538                 return 1;
2539         return 0;
2540 }
2541 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2542
2543 /* is the current PCM operation for this BE ? */
2544 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2545                 struct snd_soc_pcm_runtime *be, int stream)
2546 {
2547         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2548            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2549                   be->dpcm[stream].runtime_update))
2550                 return 1;
2551         return 0;
2552 }
2553 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2554
2555 /* get the substream for this BE */
2556 struct snd_pcm_substream *
2557         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2558 {
2559         return be->pcm->streams[stream].substream;
2560 }
2561 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2562
2563 /* get the BE runtime state */
2564 enum snd_soc_dpcm_state
2565         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2566 {
2567         return be->dpcm[stream].state;
2568 }
2569 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2570
2571 /* set the BE runtime state */
2572 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2573                 int stream, enum snd_soc_dpcm_state state)
2574 {
2575         be->dpcm[stream].state = state;
2576 }
2577 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2578
2579 /*
2580  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2581  * are not running, paused or suspended for the specified stream direction.
2582  */
2583 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2584                 struct snd_soc_pcm_runtime *be, int stream)
2585 {
2586         struct snd_soc_dpcm *dpcm;
2587         int state;
2588
2589         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2590
2591                 if (dpcm->fe == fe)
2592                         continue;
2593
2594                 state = dpcm->fe->dpcm[stream].state;
2595                 if (state == SND_SOC_DPCM_STATE_START ||
2596                         state == SND_SOC_DPCM_STATE_PAUSED ||
2597                         state == SND_SOC_DPCM_STATE_SUSPEND)
2598                         return 0;
2599         }
2600
2601         /* it's safe to free/stop this BE DAI */
2602         return 1;
2603 }
2604 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2605
2606 /*
2607  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2608  * running, paused or suspended for the specified stream direction.
2609  */
2610 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2611                 struct snd_soc_pcm_runtime *be, int stream)
2612 {
2613         struct snd_soc_dpcm *dpcm;
2614         int state;
2615
2616         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2617
2618                 if (dpcm->fe == fe)
2619                         continue;
2620
2621                 state = dpcm->fe->dpcm[stream].state;
2622                 if (state == SND_SOC_DPCM_STATE_START ||
2623                         state == SND_SOC_DPCM_STATE_PAUSED ||
2624                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2625                         state == SND_SOC_DPCM_STATE_PREPARE)
2626                         return 0;
2627         }
2628
2629         /* it's safe to change hw_params */
2630         return 1;
2631 }
2632 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2633
2634 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2635                 int cmd, struct snd_soc_platform *platform)
2636 {
2637         if (platform->driver->ops && platform->driver->ops->trigger)
2638                 return platform->driver->ops->trigger(substream, cmd);
2639         return 0;
2640 }
2641 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2642
2643 #ifdef CONFIG_DEBUG_FS
2644 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2645 {
2646         switch (state) {
2647         case SND_SOC_DPCM_STATE_NEW:
2648                 return "new";
2649         case SND_SOC_DPCM_STATE_OPEN:
2650                 return "open";
2651         case SND_SOC_DPCM_STATE_HW_PARAMS:
2652                 return "hw_params";
2653         case SND_SOC_DPCM_STATE_PREPARE:
2654                 return "prepare";
2655         case SND_SOC_DPCM_STATE_START:
2656                 return "start";
2657         case SND_SOC_DPCM_STATE_STOP:
2658                 return "stop";
2659         case SND_SOC_DPCM_STATE_SUSPEND:
2660                 return "suspend";
2661         case SND_SOC_DPCM_STATE_PAUSED:
2662                 return "paused";
2663         case SND_SOC_DPCM_STATE_HW_FREE:
2664                 return "hw_free";
2665         case SND_SOC_DPCM_STATE_CLOSE:
2666                 return "close";
2667         }
2668
2669         return "unknown";
2670 }
2671
2672 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2673                                 int stream, char *buf, size_t size)
2674 {
2675         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2676         struct snd_soc_dpcm *dpcm;
2677         ssize_t offset = 0;
2678
2679         /* FE state */
2680         offset += snprintf(buf + offset, size - offset,
2681                         "[%s - %s]\n", fe->dai_link->name,
2682                         stream ? "Capture" : "Playback");
2683
2684         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2685                         dpcm_state_string(fe->dpcm[stream].state));
2686
2687         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2688             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2689                 offset += snprintf(buf + offset, size - offset,
2690                                 "Hardware Params: "
2691                                 "Format = %s, Channels = %d, Rate = %d\n",
2692                                 snd_pcm_format_name(params_format(params)),
2693                                 params_channels(params),
2694                                 params_rate(params));
2695
2696         /* BEs state */
2697         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2698
2699         if (list_empty(&fe->dpcm[stream].be_clients)) {
2700                 offset += snprintf(buf + offset, size - offset,
2701                                 " No active DSP links\n");
2702                 goto out;
2703         }
2704
2705         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2706                 struct snd_soc_pcm_runtime *be = dpcm->be;
2707                 params = &dpcm->hw_params;
2708
2709                 offset += snprintf(buf + offset, size - offset,
2710                                 "- %s\n", be->dai_link->name);
2711
2712                 offset += snprintf(buf + offset, size - offset,
2713                                 "   State: %s\n",
2714                                 dpcm_state_string(be->dpcm[stream].state));
2715
2716                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2717                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2718                         offset += snprintf(buf + offset, size - offset,
2719                                 "   Hardware Params: "
2720                                 "Format = %s, Channels = %d, Rate = %d\n",
2721                                 snd_pcm_format_name(params_format(params)),
2722                                 params_channels(params),
2723                                 params_rate(params));
2724         }
2725
2726 out:
2727         return offset;
2728 }
2729
2730 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2731                                 size_t count, loff_t *ppos)
2732 {
2733         struct snd_soc_pcm_runtime *fe = file->private_data;
2734         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2735         char *buf;
2736
2737         buf = kmalloc(out_count, GFP_KERNEL);
2738         if (!buf)
2739                 return -ENOMEM;
2740
2741         if (fe->cpu_dai->driver->playback.channels_min)
2742                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2743                                         buf + offset, out_count - offset);
2744
2745         if (fe->cpu_dai->driver->capture.channels_min)
2746                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2747                                         buf + offset, out_count - offset);
2748
2749         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2750
2751         kfree(buf);
2752         return ret;
2753 }
2754
2755 static const struct file_operations dpcm_state_fops = {
2756         .open = simple_open,
2757         .read = dpcm_state_read_file,
2758         .llseek = default_llseek,
2759 };
2760
2761 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2762 {
2763         if (!rtd->dai_link)
2764                 return 0;
2765
2766         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2767                         rtd->card->debugfs_card_root);
2768         if (!rtd->debugfs_dpcm_root) {
2769                 dev_dbg(rtd->dev,
2770                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2771                          rtd->dai_link->name);
2772                 return -EINVAL;
2773         }
2774
2775         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2776                                                 rtd->debugfs_dpcm_root,
2777                                                 rtd, &dpcm_state_fops);
2778
2779         return 0;
2780 }
2781 #endif