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_do_trigger(struct snd_pcm_substream *substream, int cmd);
1526
1527 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1528  * for avoiding the race with trigger callback.
1529  * If the state is unset and a trigger is pending while the previous operation,
1530  * process the pending trigger action here.
1531  */
1532 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1533                                      int stream, enum snd_soc_dpcm_update state)
1534 {
1535         struct snd_pcm_substream *substream =
1536                 snd_soc_dpcm_get_substream(fe, stream);
1537
1538         snd_pcm_stream_lock_irq(substream);
1539         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1540                 dpcm_fe_dai_do_trigger(substream,
1541                                        fe->dpcm[stream].trigger_pending - 1);
1542                 fe->dpcm[stream].trigger_pending = 0;
1543         }
1544         fe->dpcm[stream].runtime_update = state;
1545         snd_pcm_stream_unlock_irq(substream);
1546 }
1547
1548 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1549 {
1550         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1551         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1552         int stream = fe_substream->stream, ret = 0;
1553
1554         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1555
1556         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1557         if (ret < 0) {
1558                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1559                 goto be_err;
1560         }
1561
1562         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1563
1564         /* start the DAI frontend */
1565         ret = soc_pcm_open(fe_substream);
1566         if (ret < 0) {
1567                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1568                 goto unwind;
1569         }
1570
1571         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1572
1573         dpcm_set_fe_runtime(fe_substream);
1574         snd_pcm_limit_hw_rates(runtime);
1575
1576         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1577         return 0;
1578
1579 unwind:
1580         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1581 be_err:
1582         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1583         return ret;
1584 }
1585
1586 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1587 {
1588         struct snd_soc_dpcm *dpcm;
1589
1590         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1591         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1592
1593                 struct snd_soc_pcm_runtime *be = dpcm->be;
1594                 struct snd_pcm_substream *be_substream =
1595                         snd_soc_dpcm_get_substream(be, stream);
1596
1597                 /* is this op for this BE ? */
1598                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1599                         continue;
1600
1601                 if (be->dpcm[stream].users == 0)
1602                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1603                                 stream ? "capture" : "playback",
1604                                 be->dpcm[stream].state);
1605
1606                 if (--be->dpcm[stream].users != 0)
1607                         continue;
1608
1609                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1610                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1611                         continue;
1612
1613                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1614                         dpcm->fe->dai_link->name);
1615
1616                 soc_pcm_close(be_substream);
1617                 be_substream->runtime = NULL;
1618
1619                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1620         }
1621         return 0;
1622 }
1623
1624 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1625 {
1626         struct snd_soc_pcm_runtime *fe = substream->private_data;
1627         int stream = substream->stream;
1628
1629         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1630
1631         /* shutdown the BEs */
1632         dpcm_be_dai_shutdown(fe, substream->stream);
1633
1634         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1635
1636         /* now shutdown the frontend */
1637         soc_pcm_close(substream);
1638
1639         /* run the stream event for each BE */
1640         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1641
1642         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1643         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1644         return 0;
1645 }
1646
1647 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1648 {
1649         struct snd_soc_dpcm *dpcm;
1650
1651         /* only hw_params backends that are either sinks or sources
1652          * to this frontend DAI */
1653         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1654
1655                 struct snd_soc_pcm_runtime *be = dpcm->be;
1656                 struct snd_pcm_substream *be_substream =
1657                         snd_soc_dpcm_get_substream(be, stream);
1658
1659                 /* is this op for this BE ? */
1660                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1661                         continue;
1662
1663                 /* only free hw when no longer used - check all FEs */
1664                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1665                                 continue;
1666
1667                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1668                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1669                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1670                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1671                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1672                         continue;
1673
1674                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1675                         dpcm->fe->dai_link->name);
1676
1677                 soc_pcm_hw_free(be_substream);
1678
1679                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1680         }
1681
1682         return 0;
1683 }
1684
1685 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1686 {
1687         struct snd_soc_pcm_runtime *fe = substream->private_data;
1688         int err, stream = substream->stream;
1689
1690         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1691         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1692
1693         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1694
1695         /* call hw_free on the frontend */
1696         err = soc_pcm_hw_free(substream);
1697         if (err < 0)
1698                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1699                         fe->dai_link->name);
1700
1701         /* only hw_params backends that are either sinks or sources
1702          * to this frontend DAI */
1703         err = dpcm_be_dai_hw_free(fe, stream);
1704
1705         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1706         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1707
1708         mutex_unlock(&fe->card->mutex);
1709         return 0;
1710 }
1711
1712 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1713 {
1714         struct snd_soc_dpcm *dpcm;
1715         int ret;
1716
1717         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1718
1719                 struct snd_soc_pcm_runtime *be = dpcm->be;
1720                 struct snd_pcm_substream *be_substream =
1721                         snd_soc_dpcm_get_substream(be, stream);
1722
1723                 /* is this op for this BE ? */
1724                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1725                         continue;
1726
1727                 /* only allow hw_params() if no connected FEs are running */
1728                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1729                         continue;
1730
1731                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1732                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1733                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1734                         continue;
1735
1736                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1737                         dpcm->fe->dai_link->name);
1738
1739                 /* copy params for each dpcm */
1740                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1741                                 sizeof(struct snd_pcm_hw_params));
1742
1743                 /* perform any hw_params fixups */
1744                 if (be->dai_link->be_hw_params_fixup) {
1745                         ret = be->dai_link->be_hw_params_fixup(be,
1746                                         &dpcm->hw_params);
1747                         if (ret < 0) {
1748                                 dev_err(be->dev,
1749                                         "ASoC: hw_params BE fixup failed %d\n",
1750                                         ret);
1751                                 goto unwind;
1752                         }
1753                 }
1754
1755                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1756                 if (ret < 0) {
1757                         dev_err(dpcm->be->dev,
1758                                 "ASoC: hw_params BE failed %d\n", ret);
1759                         goto unwind;
1760                 }
1761
1762                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1763         }
1764         return 0;
1765
1766 unwind:
1767         /* disable any enabled and non active backends */
1768         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1769                 struct snd_soc_pcm_runtime *be = dpcm->be;
1770                 struct snd_pcm_substream *be_substream =
1771                         snd_soc_dpcm_get_substream(be, stream);
1772
1773                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1774                         continue;
1775
1776                 /* only allow hw_free() if no connected FEs are running */
1777                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1778                         continue;
1779
1780                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1781                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1782                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1783                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1784                         continue;
1785
1786                 soc_pcm_hw_free(be_substream);
1787         }
1788
1789         return ret;
1790 }
1791
1792 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1793                                  struct snd_pcm_hw_params *params)
1794 {
1795         struct snd_soc_pcm_runtime *fe = substream->private_data;
1796         int ret, stream = substream->stream;
1797
1798         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1799         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1800
1801         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1802                         sizeof(struct snd_pcm_hw_params));
1803         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1804         if (ret < 0) {
1805                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1806                 goto out;
1807         }
1808
1809         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1810                         fe->dai_link->name, params_rate(params),
1811                         params_channels(params), params_format(params));
1812
1813         /* call hw_params on the frontend */
1814         ret = soc_pcm_hw_params(substream, params);
1815         if (ret < 0) {
1816                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1817                 dpcm_be_dai_hw_free(fe, stream);
1818          } else
1819                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1820
1821 out:
1822         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1823         mutex_unlock(&fe->card->mutex);
1824         return ret;
1825 }
1826
1827 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1828                 struct snd_pcm_substream *substream, int cmd)
1829 {
1830         int ret;
1831
1832         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1833                         dpcm->fe->dai_link->name, cmd);
1834
1835         ret = soc_pcm_trigger(substream, cmd);
1836         if (ret < 0)
1837                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1838
1839         return ret;
1840 }
1841
1842 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1843                                int cmd)
1844 {
1845         struct snd_soc_dpcm *dpcm;
1846         int ret = 0;
1847
1848         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1849
1850                 struct snd_soc_pcm_runtime *be = dpcm->be;
1851                 struct snd_pcm_substream *be_substream =
1852                         snd_soc_dpcm_get_substream(be, stream);
1853
1854                 /* is this op for this BE ? */
1855                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1856                         continue;
1857
1858                 switch (cmd) {
1859                 case SNDRV_PCM_TRIGGER_START:
1860                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1861                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1862                                 continue;
1863
1864                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1865                         if (ret)
1866                                 return ret;
1867
1868                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1869                         break;
1870                 case SNDRV_PCM_TRIGGER_RESUME:
1871                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
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_START;
1879                         break;
1880                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1881                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1882                                 continue;
1883
1884                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1885                         if (ret)
1886                                 return ret;
1887
1888                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1889                         break;
1890                 case SNDRV_PCM_TRIGGER_STOP:
1891                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1892                                 continue;
1893
1894                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1895                                 continue;
1896
1897                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1898                         if (ret)
1899                                 return ret;
1900
1901                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1902                         break;
1903                 case SNDRV_PCM_TRIGGER_SUSPEND:
1904                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1905                                 continue;
1906
1907                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1908                                 continue;
1909
1910                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1911                         if (ret)
1912                                 return ret;
1913
1914                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1915                         break;
1916                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1917                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1918                                 continue;
1919
1920                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1921                                 continue;
1922
1923                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1924                         if (ret)
1925                                 return ret;
1926
1927                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1928                         break;
1929                 }
1930         }
1931
1932         return ret;
1933 }
1934 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1935
1936 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
1937 {
1938         struct snd_soc_pcm_runtime *fe = substream->private_data;
1939         int stream = substream->stream, ret;
1940         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1941
1942         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1943
1944         switch (trigger) {
1945         case SND_SOC_DPCM_TRIGGER_PRE:
1946                 /* call trigger on the frontend before the backend. */
1947
1948                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1949                                 fe->dai_link->name, cmd);
1950
1951                 ret = soc_pcm_trigger(substream, cmd);
1952                 if (ret < 0) {
1953                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1954                         goto out;
1955                 }
1956
1957                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1958                 break;
1959         case SND_SOC_DPCM_TRIGGER_POST:
1960                 /* call trigger on the frontend after the backend. */
1961
1962                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1963                 if (ret < 0) {
1964                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1965                         goto out;
1966                 }
1967
1968                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1969                                 fe->dai_link->name, cmd);
1970
1971                 ret = soc_pcm_trigger(substream, cmd);
1972                 break;
1973         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1974                 /* bespoke trigger() - handles both FE and BEs */
1975
1976                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1977                                 fe->dai_link->name, cmd);
1978
1979                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1980                 if (ret < 0) {
1981                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1982                         goto out;
1983                 }
1984                 break;
1985         default:
1986                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1987                                 fe->dai_link->name);
1988                 ret = -EINVAL;
1989                 goto out;
1990         }
1991
1992         switch (cmd) {
1993         case SNDRV_PCM_TRIGGER_START:
1994         case SNDRV_PCM_TRIGGER_RESUME:
1995         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1996                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1997                 break;
1998         case SNDRV_PCM_TRIGGER_STOP:
1999         case SNDRV_PCM_TRIGGER_SUSPEND:
2000         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2001                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2002                 break;
2003         }
2004
2005 out:
2006         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2007         return ret;
2008 }
2009
2010 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2011 {
2012         struct snd_soc_pcm_runtime *fe = substream->private_data;
2013         int stream = substream->stream;
2014
2015         /* if FE's runtime_update is already set, we're in race;
2016          * process this trigger later at exit
2017          */
2018         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2019                 fe->dpcm[stream].trigger_pending = cmd + 1;
2020                 return 0; /* delayed, assuming it's successful */
2021         }
2022
2023         /* we're alone, let's trigger */
2024         return dpcm_fe_dai_do_trigger(substream, cmd);
2025 }
2026
2027 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2028 {
2029         struct snd_soc_dpcm *dpcm;
2030         int ret = 0;
2031
2032         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2033
2034                 struct snd_soc_pcm_runtime *be = dpcm->be;
2035                 struct snd_pcm_substream *be_substream =
2036                         snd_soc_dpcm_get_substream(be, stream);
2037
2038                 /* is this op for this BE ? */
2039                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2040                         continue;
2041
2042                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2043                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2044                         continue;
2045
2046                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2047                         dpcm->fe->dai_link->name);
2048
2049                 ret = soc_pcm_prepare(be_substream);
2050                 if (ret < 0) {
2051                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2052                                 ret);
2053                         break;
2054                 }
2055
2056                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2057         }
2058         return ret;
2059 }
2060
2061 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2062 {
2063         struct snd_soc_pcm_runtime *fe = substream->private_data;
2064         int stream = substream->stream, ret = 0;
2065
2066         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2067
2068         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2069
2070         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2071
2072         /* there is no point preparing this FE if there are no BEs */
2073         if (list_empty(&fe->dpcm[stream].be_clients)) {
2074                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2075                                 fe->dai_link->name);
2076                 ret = -EINVAL;
2077                 goto out;
2078         }
2079
2080         ret = dpcm_be_dai_prepare(fe, substream->stream);
2081         if (ret < 0)
2082                 goto out;
2083
2084         /* call prepare on the frontend */
2085         ret = soc_pcm_prepare(substream);
2086         if (ret < 0) {
2087                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2088                         fe->dai_link->name);
2089                 goto out;
2090         }
2091
2092         /* run the stream event for each BE */
2093         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2094         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2095
2096 out:
2097         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2098         mutex_unlock(&fe->card->mutex);
2099
2100         return ret;
2101 }
2102
2103 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2104                      unsigned int cmd, void *arg)
2105 {
2106         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2107         struct snd_soc_platform *platform = rtd->platform;
2108
2109         if (platform->driver->ops && platform->driver->ops->ioctl)
2110                 return platform->driver->ops->ioctl(substream, cmd, arg);
2111         return snd_pcm_lib_ioctl(substream, cmd, arg);
2112 }
2113
2114 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2115 {
2116         struct snd_pcm_substream *substream =
2117                 snd_soc_dpcm_get_substream(fe, stream);
2118         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2119         int err;
2120
2121         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2122                         stream ? "capture" : "playback", fe->dai_link->name);
2123
2124         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2125                 /* call bespoke trigger - FE takes care of all BE triggers */
2126                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2127                                 fe->dai_link->name);
2128
2129                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2130                 if (err < 0)
2131                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2132         } else {
2133                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2134                         fe->dai_link->name);
2135
2136                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2137                 if (err < 0)
2138                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2139         }
2140
2141         err = dpcm_be_dai_hw_free(fe, stream);
2142         if (err < 0)
2143                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2144
2145         err = dpcm_be_dai_shutdown(fe, stream);
2146         if (err < 0)
2147                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2148
2149         /* run the stream event for each BE */
2150         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2151
2152         return 0;
2153 }
2154
2155 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2156 {
2157         struct snd_pcm_substream *substream =
2158                 snd_soc_dpcm_get_substream(fe, stream);
2159         struct snd_soc_dpcm *dpcm;
2160         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2161         int ret;
2162
2163         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2164                         stream ? "capture" : "playback", fe->dai_link->name);
2165
2166         /* Only start the BE if the FE is ready */
2167         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2168                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2169                 return -EINVAL;
2170
2171         /* startup must always be called for new BEs */
2172         ret = dpcm_be_dai_startup(fe, stream);
2173         if (ret < 0)
2174                 goto disconnect;
2175
2176         /* keep going if FE state is > open */
2177         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2178                 return 0;
2179
2180         ret = dpcm_be_dai_hw_params(fe, stream);
2181         if (ret < 0)
2182                 goto close;
2183
2184         /* keep going if FE state is > hw_params */
2185         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2186                 return 0;
2187
2188
2189         ret = dpcm_be_dai_prepare(fe, stream);
2190         if (ret < 0)
2191                 goto hw_free;
2192
2193         /* run the stream event for each BE */
2194         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2195
2196         /* keep going if FE state is > prepare */
2197         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2198                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2199                 return 0;
2200
2201         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2202                 /* call trigger on the frontend - FE takes care of all BE triggers */
2203                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2204                                 fe->dai_link->name);
2205
2206                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2207                 if (ret < 0) {
2208                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2209                         goto hw_free;
2210                 }
2211         } else {
2212                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2213                         fe->dai_link->name);
2214
2215                 ret = dpcm_be_dai_trigger(fe, stream,
2216                                         SNDRV_PCM_TRIGGER_START);
2217                 if (ret < 0) {
2218                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2219                         goto hw_free;
2220                 }
2221         }
2222
2223         return 0;
2224
2225 hw_free:
2226         dpcm_be_dai_hw_free(fe, stream);
2227 close:
2228         dpcm_be_dai_shutdown(fe, stream);
2229 disconnect:
2230         /* disconnect any non started BEs */
2231         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2232                 struct snd_soc_pcm_runtime *be = dpcm->be;
2233                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2234                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2235         }
2236
2237         return ret;
2238 }
2239
2240 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2241 {
2242         int ret;
2243
2244         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2245         ret = dpcm_run_update_startup(fe, stream);
2246         if (ret < 0)
2247                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2248         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2249
2250         return ret;
2251 }
2252
2253 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2254 {
2255         int ret;
2256
2257         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2258         ret = dpcm_run_update_shutdown(fe, stream);
2259         if (ret < 0)
2260                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2261         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2262
2263         return ret;
2264 }
2265
2266 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2267  * any DAI links.
2268  */
2269 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2270 {
2271         int i, old, new, paths;
2272
2273         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2274         for (i = 0; i < card->num_rtd; i++) {
2275                 struct snd_soc_dapm_widget_list *list;
2276                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
2277
2278                 /* make sure link is FE */
2279                 if (!fe->dai_link->dynamic)
2280                         continue;
2281
2282                 /* only check active links */
2283                 if (!fe->cpu_dai->active)
2284                         continue;
2285
2286                 /* DAPM sync will call this to update DSP paths */
2287                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2288                         fe->dai_link->name);
2289
2290                 /* skip if FE doesn't have playback capability */
2291                 if (!fe->cpu_dai->driver->playback.channels_min)
2292                         goto capture;
2293
2294                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2295                 if (paths < 0) {
2296                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2297                                         fe->dai_link->name,  "playback");
2298                         mutex_unlock(&card->mutex);
2299                         return paths;
2300                 }
2301
2302                 /* update any new playback paths */
2303                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2304                 if (new) {
2305                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2306                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2307                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2308                 }
2309
2310                 /* update any old playback paths */
2311                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2312                 if (old) {
2313                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2314                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2315                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2316                 }
2317
2318                 dpcm_path_put(&list);
2319 capture:
2320                 /* skip if FE doesn't have capture capability */
2321                 if (!fe->cpu_dai->driver->capture.channels_min)
2322                         continue;
2323
2324                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2325                 if (paths < 0) {
2326                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2327                                         fe->dai_link->name,  "capture");
2328                         mutex_unlock(&card->mutex);
2329                         return paths;
2330                 }
2331
2332                 /* update any new capture paths */
2333                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2334                 if (new) {
2335                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2336                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2337                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2338                 }
2339
2340                 /* update any old capture paths */
2341                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2342                 if (old) {
2343                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2344                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2345                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2346                 }
2347
2348                 dpcm_path_put(&list);
2349         }
2350
2351         mutex_unlock(&card->mutex);
2352         return 0;
2353 }
2354 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2355 {
2356         struct snd_soc_dpcm *dpcm;
2357         struct list_head *clients =
2358                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2359
2360         list_for_each_entry(dpcm, clients, list_be) {
2361
2362                 struct snd_soc_pcm_runtime *be = dpcm->be;
2363                 int i;
2364
2365                 if (be->dai_link->ignore_suspend)
2366                         continue;
2367
2368                 for (i = 0; i < be->num_codecs; i++) {
2369                         struct snd_soc_dai *dai = be->codec_dais[i];
2370                         struct snd_soc_dai_driver *drv = dai->driver;
2371
2372                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2373                                          be->dai_link->name);
2374
2375                         if (drv->ops && drv->ops->digital_mute &&
2376                                                         dai->playback_active)
2377                                 drv->ops->digital_mute(dai, mute);
2378                 }
2379         }
2380
2381         return 0;
2382 }
2383
2384 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2385 {
2386         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2387         struct snd_soc_dpcm *dpcm;
2388         struct snd_soc_dapm_widget_list *list;
2389         int ret;
2390         int stream = fe_substream->stream;
2391
2392         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2393         fe->dpcm[stream].runtime = fe_substream->runtime;
2394
2395         ret = dpcm_path_get(fe, stream, &list);
2396         if (ret < 0) {
2397                 mutex_unlock(&fe->card->mutex);
2398                 return ret;
2399         } else if (ret == 0) {
2400                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2401                         fe->dai_link->name, stream ? "capture" : "playback");
2402         }
2403
2404         /* calculate valid and active FE <-> BE dpcms */
2405         dpcm_process_paths(fe, stream, &list, 1);
2406
2407         ret = dpcm_fe_dai_startup(fe_substream);
2408         if (ret < 0) {
2409                 /* clean up all links */
2410                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2411                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2412
2413                 dpcm_be_disconnect(fe, stream);
2414                 fe->dpcm[stream].runtime = NULL;
2415         }
2416
2417         dpcm_clear_pending_state(fe, stream);
2418         dpcm_path_put(&list);
2419         mutex_unlock(&fe->card->mutex);
2420         return ret;
2421 }
2422
2423 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2424 {
2425         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2426         struct snd_soc_dpcm *dpcm;
2427         int stream = fe_substream->stream, ret;
2428
2429         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2430         ret = dpcm_fe_dai_shutdown(fe_substream);
2431
2432         /* mark FE's links ready to prune */
2433         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2434                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2435
2436         dpcm_be_disconnect(fe, stream);
2437
2438         fe->dpcm[stream].runtime = NULL;
2439         mutex_unlock(&fe->card->mutex);
2440         return ret;
2441 }
2442
2443 /* create a new pcm */
2444 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2445 {
2446         struct snd_soc_platform *platform = rtd->platform;
2447         struct snd_soc_dai *codec_dai;
2448         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2449         struct snd_pcm *pcm;
2450         char new_name[64];
2451         int ret = 0, playback = 0, capture = 0;
2452         int i;
2453
2454         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2455                 playback = rtd->dai_link->dpcm_playback;
2456                 capture = rtd->dai_link->dpcm_capture;
2457         } else {
2458                 for (i = 0; i < rtd->num_codecs; i++) {
2459                         codec_dai = rtd->codec_dais[i];
2460                         if (codec_dai->driver->playback.channels_min)
2461                                 playback = 1;
2462                         if (codec_dai->driver->capture.channels_min)
2463                                 capture = 1;
2464                 }
2465
2466                 capture = capture && cpu_dai->driver->capture.channels_min;
2467                 playback = playback && cpu_dai->driver->playback.channels_min;
2468         }
2469
2470         if (rtd->dai_link->playback_only) {
2471                 playback = 1;
2472                 capture = 0;
2473         }
2474
2475         if (rtd->dai_link->capture_only) {
2476                 playback = 0;
2477                 capture = 1;
2478         }
2479
2480         /* create the PCM */
2481         if (rtd->dai_link->no_pcm) {
2482                 snprintf(new_name, sizeof(new_name), "(%s)",
2483                         rtd->dai_link->stream_name);
2484
2485                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2486                                 playback, capture, &pcm);
2487         } else {
2488                 if (rtd->dai_link->dynamic)
2489                         snprintf(new_name, sizeof(new_name), "%s (*)",
2490                                 rtd->dai_link->stream_name);
2491                 else
2492                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2493                                 rtd->dai_link->stream_name,
2494                                 (rtd->num_codecs > 1) ?
2495                                 "multicodec" : rtd->codec_dai->name, num);
2496
2497                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2498                         capture, &pcm);
2499         }
2500         if (ret < 0) {
2501                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2502                         rtd->dai_link->name);
2503                 return ret;
2504         }
2505         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2506
2507         /* DAPM dai link stream work */
2508         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2509
2510         rtd->pcm = pcm;
2511         pcm->private_data = rtd;
2512
2513         if (rtd->dai_link->no_pcm) {
2514                 if (playback)
2515                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2516                 if (capture)
2517                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2518                 goto out;
2519         }
2520
2521         /* ASoC PCM operations */
2522         if (rtd->dai_link->dynamic) {
2523                 rtd->ops.open           = dpcm_fe_dai_open;
2524                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2525                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2526                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2527                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2528                 rtd->ops.close          = dpcm_fe_dai_close;
2529                 rtd->ops.pointer        = soc_pcm_pointer;
2530                 rtd->ops.ioctl          = soc_pcm_ioctl;
2531         } else {
2532                 rtd->ops.open           = soc_pcm_open;
2533                 rtd->ops.hw_params      = soc_pcm_hw_params;
2534                 rtd->ops.prepare        = soc_pcm_prepare;
2535                 rtd->ops.trigger        = soc_pcm_trigger;
2536                 rtd->ops.hw_free        = soc_pcm_hw_free;
2537                 rtd->ops.close          = soc_pcm_close;
2538                 rtd->ops.pointer        = soc_pcm_pointer;
2539                 rtd->ops.ioctl          = soc_pcm_ioctl;
2540         }
2541
2542         if (platform->driver->ops) {
2543                 rtd->ops.ack            = platform->driver->ops->ack;
2544                 rtd->ops.copy           = platform->driver->ops->copy;
2545                 rtd->ops.silence        = platform->driver->ops->silence;
2546                 rtd->ops.page           = platform->driver->ops->page;
2547                 rtd->ops.mmap           = platform->driver->ops->mmap;
2548         }
2549
2550         if (playback)
2551                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2552
2553         if (capture)
2554                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2555
2556         if (platform->driver->pcm_new) {
2557                 ret = platform->driver->pcm_new(rtd);
2558                 if (ret < 0) {
2559                         dev_err(platform->dev,
2560                                 "ASoC: pcm constructor failed: %d\n",
2561                                 ret);
2562                         return ret;
2563                 }
2564         }
2565
2566         pcm->private_free = platform->driver->pcm_free;
2567 out:
2568         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2569                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2570                  cpu_dai->name);
2571         return ret;
2572 }
2573
2574 /* is the current PCM operation for this FE ? */
2575 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2576 {
2577         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2578                 return 1;
2579         return 0;
2580 }
2581 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2582
2583 /* is the current PCM operation for this BE ? */
2584 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2585                 struct snd_soc_pcm_runtime *be, int stream)
2586 {
2587         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2588            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2589                   be->dpcm[stream].runtime_update))
2590                 return 1;
2591         return 0;
2592 }
2593 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2594
2595 /* get the substream for this BE */
2596 struct snd_pcm_substream *
2597         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2598 {
2599         return be->pcm->streams[stream].substream;
2600 }
2601 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2602
2603 /* get the BE runtime state */
2604 enum snd_soc_dpcm_state
2605         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2606 {
2607         return be->dpcm[stream].state;
2608 }
2609 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2610
2611 /* set the BE runtime state */
2612 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2613                 int stream, enum snd_soc_dpcm_state state)
2614 {
2615         be->dpcm[stream].state = state;
2616 }
2617 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2618
2619 /*
2620  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2621  * are not running, paused or suspended for the specified stream direction.
2622  */
2623 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2624                 struct snd_soc_pcm_runtime *be, int stream)
2625 {
2626         struct snd_soc_dpcm *dpcm;
2627         int state;
2628
2629         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2630
2631                 if (dpcm->fe == fe)
2632                         continue;
2633
2634                 state = dpcm->fe->dpcm[stream].state;
2635                 if (state == SND_SOC_DPCM_STATE_START ||
2636                         state == SND_SOC_DPCM_STATE_PAUSED ||
2637                         state == SND_SOC_DPCM_STATE_SUSPEND)
2638                         return 0;
2639         }
2640
2641         /* it's safe to free/stop this BE DAI */
2642         return 1;
2643 }
2644 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2645
2646 /*
2647  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2648  * running, paused or suspended for the specified stream direction.
2649  */
2650 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2651                 struct snd_soc_pcm_runtime *be, int stream)
2652 {
2653         struct snd_soc_dpcm *dpcm;
2654         int state;
2655
2656         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2657
2658                 if (dpcm->fe == fe)
2659                         continue;
2660
2661                 state = dpcm->fe->dpcm[stream].state;
2662                 if (state == SND_SOC_DPCM_STATE_START ||
2663                         state == SND_SOC_DPCM_STATE_PAUSED ||
2664                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2665                         state == SND_SOC_DPCM_STATE_PREPARE)
2666                         return 0;
2667         }
2668
2669         /* it's safe to change hw_params */
2670         return 1;
2671 }
2672 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2673
2674 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2675                 int cmd, struct snd_soc_platform *platform)
2676 {
2677         if (platform->driver->ops && platform->driver->ops->trigger)
2678                 return platform->driver->ops->trigger(substream, cmd);
2679         return 0;
2680 }
2681 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2682
2683 #ifdef CONFIG_DEBUG_FS
2684 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2685 {
2686         switch (state) {
2687         case SND_SOC_DPCM_STATE_NEW:
2688                 return "new";
2689         case SND_SOC_DPCM_STATE_OPEN:
2690                 return "open";
2691         case SND_SOC_DPCM_STATE_HW_PARAMS:
2692                 return "hw_params";
2693         case SND_SOC_DPCM_STATE_PREPARE:
2694                 return "prepare";
2695         case SND_SOC_DPCM_STATE_START:
2696                 return "start";
2697         case SND_SOC_DPCM_STATE_STOP:
2698                 return "stop";
2699         case SND_SOC_DPCM_STATE_SUSPEND:
2700                 return "suspend";
2701         case SND_SOC_DPCM_STATE_PAUSED:
2702                 return "paused";
2703         case SND_SOC_DPCM_STATE_HW_FREE:
2704                 return "hw_free";
2705         case SND_SOC_DPCM_STATE_CLOSE:
2706                 return "close";
2707         }
2708
2709         return "unknown";
2710 }
2711
2712 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2713                                 int stream, char *buf, size_t size)
2714 {
2715         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2716         struct snd_soc_dpcm *dpcm;
2717         ssize_t offset = 0;
2718
2719         /* FE state */
2720         offset += snprintf(buf + offset, size - offset,
2721                         "[%s - %s]\n", fe->dai_link->name,
2722                         stream ? "Capture" : "Playback");
2723
2724         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2725                         dpcm_state_string(fe->dpcm[stream].state));
2726
2727         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2728             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2729                 offset += snprintf(buf + offset, size - offset,
2730                                 "Hardware Params: "
2731                                 "Format = %s, Channels = %d, Rate = %d\n",
2732                                 snd_pcm_format_name(params_format(params)),
2733                                 params_channels(params),
2734                                 params_rate(params));
2735
2736         /* BEs state */
2737         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2738
2739         if (list_empty(&fe->dpcm[stream].be_clients)) {
2740                 offset += snprintf(buf + offset, size - offset,
2741                                 " No active DSP links\n");
2742                 goto out;
2743         }
2744
2745         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2746                 struct snd_soc_pcm_runtime *be = dpcm->be;
2747                 params = &dpcm->hw_params;
2748
2749                 offset += snprintf(buf + offset, size - offset,
2750                                 "- %s\n", be->dai_link->name);
2751
2752                 offset += snprintf(buf + offset, size - offset,
2753                                 "   State: %s\n",
2754                                 dpcm_state_string(be->dpcm[stream].state));
2755
2756                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2757                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2758                         offset += snprintf(buf + offset, size - offset,
2759                                 "   Hardware Params: "
2760                                 "Format = %s, Channels = %d, Rate = %d\n",
2761                                 snd_pcm_format_name(params_format(params)),
2762                                 params_channels(params),
2763                                 params_rate(params));
2764         }
2765
2766 out:
2767         return offset;
2768 }
2769
2770 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2771                                 size_t count, loff_t *ppos)
2772 {
2773         struct snd_soc_pcm_runtime *fe = file->private_data;
2774         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2775         char *buf;
2776
2777         buf = kmalloc(out_count, GFP_KERNEL);
2778         if (!buf)
2779                 return -ENOMEM;
2780
2781         if (fe->cpu_dai->driver->playback.channels_min)
2782                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2783                                         buf + offset, out_count - offset);
2784
2785         if (fe->cpu_dai->driver->capture.channels_min)
2786                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2787                                         buf + offset, out_count - offset);
2788
2789         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2790
2791         kfree(buf);
2792         return ret;
2793 }
2794
2795 static const struct file_operations dpcm_state_fops = {
2796         .open = simple_open,
2797         .read = dpcm_state_read_file,
2798         .llseek = default_llseek,
2799 };
2800
2801 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2802 {
2803         if (!rtd->dai_link)
2804                 return 0;
2805
2806         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2807                         rtd->card->debugfs_card_root);
2808         if (!rtd->debugfs_dpcm_root) {
2809                 dev_dbg(rtd->dev,
2810                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2811                          rtd->dai_link->name);
2812                 return -EINVAL;
2813         }
2814
2815         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2816                                                 rtd->debugfs_dpcm_root,
2817                                                 rtd, &dpcm_state_fops);
2818
2819         return 0;
2820 }
2821 #endif