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         snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
 658
 659         if (cpu_dai->driver->ops->shutdown)
 660                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 661
 662         for (i = 0; i < rtd->num_codecs; i++) {
 663                 codec_dai = rtd->codec_dais[i];
 664                 if (codec_dai->driver->ops->shutdown)
 665                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 666         }
 667
 668         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 669                 rtd->dai_link->ops->shutdown(substream);
 670
 671         if (platform->driver->ops && platform->driver->ops->close)
 672                 platform->driver->ops->close(substream);
 673
 674         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 675                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
 676                         /* powered down playback stream now */
 677                         snd_soc_dapm_stream_event(rtd,
 678                                                   SNDRV_PCM_STREAM_PLAYBACK,
 679                                                   SND_SOC_DAPM_STREAM_STOP);
 680                 } else {
 681                         /* start delayed pop wq here for playback streams */
 682                         rtd->pop_wait = 1;
 683                         queue_delayed_work(system_power_efficient_wq,
 684                                            &rtd->delayed_work,
 685                                            msecs_to_jiffies(rtd->pmdown_time));
 686                 }
 687         } else {
 688                 /* capture streams can be powered down now */
 689                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 690                                           SND_SOC_DAPM_STREAM_STOP);
 691         }
 692
 693         mutex_unlock(&rtd->pcm_mutex);
 694
 695         pm_runtime_put(platform->dev);
 696         for (i = 0; i < rtd->num_codecs; i++)
 697                 pm_runtime_put(rtd->codec_dais[i]->dev);
 698         pm_runtime_put(cpu_dai->dev);
 699         for (i = 0; i < rtd->num_codecs; i++) {
 700                 if (!rtd->codec_dais[i]->active)
 701                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 702         }
 703         if (!cpu_dai->active)
 704                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 705
 706         return 0;
 707 }
 708
 709 /*
 710  * Called by ALSA when the PCM substream is prepared, can set format, sample
 711  * rate, etc.  This function is non atomic and can be called multiple times,
 712  * it can refer to the runtime info.
 713  */
 714 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 715 {
 716         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 717         struct snd_soc_platform *platform = rtd->platform;
 718         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 719         struct snd_soc_dai *codec_dai;
 720         int i, ret = 0;
 721
 722         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 723
 724         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 725                 ret = rtd->dai_link->ops->prepare(substream);
 726                 if (ret < 0) {
 727                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 728                                 " %d\n", ret);
 729                         goto out;
 730                 }
 731         }
 732
 733         if (platform->driver->ops && platform->driver->ops->prepare) {
 734                 ret = platform->driver->ops->prepare(substream);
 735                 if (ret < 0) {
 736                         dev_err(platform->dev, "ASoC: platform prepare error:"
 737                                 " %d\n", ret);
 738                         goto out;
 739                 }
 740         }
 741
 742         for (i = 0; i < rtd->num_codecs; i++) {
 743                 codec_dai = rtd->codec_dais[i];
 744                 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
 745                         ret = codec_dai->driver->ops->prepare(substream,
 746                                                               codec_dai);
 747                         if (ret < 0) {
 748                                 dev_err(codec_dai->dev,
 749                                         "ASoC: codec DAI prepare error: %d\n",
 750                                         ret);
 751                                 goto out;
 752                         }
 753                 }
 754         }
 755
 756         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 757                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 758                 if (ret < 0) {
 759                         dev_err(cpu_dai->dev,
 760                                 "ASoC: cpu DAI prepare error: %d\n", ret);
 761                         goto out;
 762                 }
 763         }
 764
 765         /* cancel any delayed stream shutdown that is pending */
 766         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 767             rtd->pop_wait) {
 768                 rtd->pop_wait = 0;
 769                 cancel_delayed_work(&rtd->delayed_work);
 770         }
 771
 772         snd_soc_dapm_stream_event(rtd, substream->stream,
 773                         SND_SOC_DAPM_STREAM_START);
 774
 775         for (i = 0; i < rtd->num_codecs; i++)
 776                 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
 777                                          substream->stream);
 778         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
 779
 780 out:
 781         mutex_unlock(&rtd->pcm_mutex);
 782         return ret;
 783 }
 784
 785 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 786                                        unsigned int mask)
 787 {
 788         struct snd_interval *interval;
 789         int channels = hweight_long(mask);
 790
 791         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 792         interval->min = channels;
 793         interval->max = channels;
 794 }
 795
 796 int soc_dai_hw_params(struct snd_pcm_substream *substream,
 797                       struct snd_pcm_hw_params *params,
 798                       struct snd_soc_dai *dai)
 799 {
 800         int ret;
 801
 802         if (dai->driver->ops && dai->driver->ops->hw_params) {
 803                 ret = dai->driver->ops->hw_params(substream, params, dai);
 804                 if (ret < 0) {
 805                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
 806                                 dai->name, ret);
 807                         return ret;
 808                 }
 809         }
 810
 811         return 0;
 812 }
 813
 814 /*
 815  * Called by ALSA when the hardware params are set by application. This
 816  * function can also be called multiple times and can allocate buffers
 817  * (using snd_pcm_lib_* ). It's non-atomic.
 818  */
 819 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 820                                 struct snd_pcm_hw_params *params)
 821 {
 822         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 823         struct snd_soc_platform *platform = rtd->platform;
 824         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 825         int i, ret = 0;
 826
 827         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 828
 829         ret = soc_pcm_params_symmetry(substream, params);
 830         if (ret)
 831                 goto out;
 832
 833         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 834                 ret = rtd->dai_link->ops->hw_params(substream, params);
 835                 if (ret < 0) {
 836                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 837                                 " failed: %d\n", ret);
 838                         goto out;
 839                 }
 840         }
 841
 842         for (i = 0; i < rtd->num_codecs; i++) {
 843                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 844                 struct snd_pcm_hw_params codec_params;
 845
 846                 /* copy params for each codec */
 847                 codec_params = *params;
 848
 849                 /* fixup params based on TDM slot masks */
 850                 if (codec_dai->tx_mask)
 851                         soc_pcm_codec_params_fixup(&codec_params,
 852                                                    codec_dai->tx_mask);
 853                 if (codec_dai->rx_mask)
 854                         soc_pcm_codec_params_fixup(&codec_params,
 855                                                    codec_dai->rx_mask);
 856
 857                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
 858                 if(ret < 0)
 859                         goto codec_err;
 860
 861                 codec_dai->rate = params_rate(&codec_params);
 862                 codec_dai->channels = params_channels(&codec_params);
 863                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 864                                                 params_format(&codec_params));
 865         }
 866
 867         ret = soc_dai_hw_params(substream, params, cpu_dai);
 868         if (ret < 0)
 869                 goto interface_err;
 870
 871         if (platform->driver->ops && platform->driver->ops->hw_params) {
 872                 ret = platform->driver->ops->hw_params(substream, params);
 873                 if (ret < 0) {
 874                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 875                                platform->component.name, ret);
 876                         goto platform_err;
 877                 }
 878         }
 879
 880         /* store the parameters for each DAIs */
 881         cpu_dai->rate = params_rate(params);
 882         cpu_dai->channels = params_channels(params);
 883         cpu_dai->sample_bits =
 884                 snd_pcm_format_physical_width(params_format(params));
 885
 886 out:
 887         mutex_unlock(&rtd->pcm_mutex);
 888         return ret;
 889
 890 platform_err:
 891         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 892                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 893
 894 interface_err:
 895         i = rtd->num_codecs;
 896
 897 codec_err:
 898         while (--i >= 0) {
 899                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 900                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 901                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 902                 codec_dai->rate = 0;
 903         }
 904
 905         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 906                 rtd->dai_link->ops->hw_free(substream);
 907
 908         mutex_unlock(&rtd->pcm_mutex);
 909         return ret;
 910 }
 911
 912 /*
 913  * Frees resources allocated by hw_params, can be called multiple times
 914  */
 915 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 916 {
 917         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 918         struct snd_soc_platform *platform = rtd->platform;
 919         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 920         struct snd_soc_dai *codec_dai;
 921         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 922         int i;
 923
 924         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 925
 926         /* clear the corresponding DAIs parameters when going to be inactive */
 927         if (cpu_dai->active == 1) {
 928                 cpu_dai->rate = 0;
 929                 cpu_dai->channels = 0;
 930                 cpu_dai->sample_bits = 0;
 931         }
 932
 933         for (i = 0; i < rtd->num_codecs; i++) {
 934                 codec_dai = rtd->codec_dais[i];
 935                 if (codec_dai->active == 1) {
 936                         codec_dai->rate = 0;
 937                         codec_dai->channels = 0;
 938                         codec_dai->sample_bits = 0;
 939                 }
 940         }
 941
 942         /* apply codec digital mute */
 943         for (i = 0; i < rtd->num_codecs; i++) {
 944                 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
 945                     (!playback && rtd->codec_dais[i]->capture_active == 1))
 946                         snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
 947                                                  substream->stream);
 948         }
 949
 950         /* free any machine hw params */
 951         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 952                 rtd->dai_link->ops->hw_free(substream);
 953
 954         /* free any DMA resources */
 955         if (platform->driver->ops && platform->driver->ops->hw_free)
 956                 platform->driver->ops->hw_free(substream);
 957
 958         /* now free hw params for the DAIs  */
 959         for (i = 0; i < rtd->num_codecs; i++) {
 960                 codec_dai = rtd->codec_dais[i];
 961                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 962                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 963         }
 964
 965         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 966                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 967
 968         mutex_unlock(&rtd->pcm_mutex);
 969         return 0;
 970 }
 971
 972 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 973 {
 974         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 975         struct snd_soc_platform *platform = rtd->platform;
 976         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 977         struct snd_soc_dai *codec_dai;
 978         int i, ret;
 979
 980         for (i = 0; i < rtd->num_codecs; i++) {
 981                 codec_dai = rtd->codec_dais[i];
 982                 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
 983                         ret = codec_dai->driver->ops->trigger(substream,
 984                                                               cmd, codec_dai);
 985                         if (ret < 0)
 986                                 return ret;
 987                 }
 988         }
 989
 990         if (platform->driver->ops && platform->driver->ops->trigger) {
 991                 ret = platform->driver->ops->trigger(substream, cmd);
 992                 if (ret < 0)
 993                         return ret;
 994         }
 995
 996         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
 997                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 998                 if (ret < 0)
 999                         return ret;
1000         }
1001
1002         if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1003                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1004                 if (ret < 0)
1005                         return ret;
1006         }
1007
1008         return 0;
1009 }
1010
1011 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1012                                    int cmd)
1013 {
1014         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1015         struct snd_soc_platform *platform = rtd->platform;
1016         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1017         struct snd_soc_dai *codec_dai;
1018         int i, ret;
1019
1020         for (i = 0; i < rtd->num_codecs; i++) {
1021                 codec_dai = rtd->codec_dais[i];
1022                 if (codec_dai->driver->ops &&
1023                     codec_dai->driver->ops->bespoke_trigger) {
1024                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1025                                                                 cmd, codec_dai);
1026                         if (ret < 0)
1027                                 return ret;
1028                 }
1029         }
1030
1031         if (platform->driver->bespoke_trigger) {
1032                 ret = platform->driver->bespoke_trigger(substream, cmd);
1033                 if (ret < 0)
1034                         return ret;
1035         }
1036
1037         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1038                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1039                 if (ret < 0)
1040                         return ret;
1041         }
1042         return 0;
1043 }
1044 /*
1045  * soc level wrapper for pointer callback
1046  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1047  * the runtime->delay will be updated accordingly.
1048  */
1049 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1050 {
1051         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1052         struct snd_soc_platform *platform = rtd->platform;
1053         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1054         struct snd_soc_dai *codec_dai;
1055         struct snd_pcm_runtime *runtime = substream->runtime;
1056         snd_pcm_uframes_t offset = 0;
1057         snd_pcm_sframes_t delay = 0;
1058         snd_pcm_sframes_t codec_delay = 0;
1059         int i;
1060
1061         if (platform->driver->ops && platform->driver->ops->pointer)
1062                 offset = platform->driver->ops->pointer(substream);
1063
1064         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1065                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1066
1067         for (i = 0; i < rtd->num_codecs; i++) {
1068                 codec_dai = rtd->codec_dais[i];
1069                 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1070                         codec_delay = max(codec_delay,
1071                                         codec_dai->driver->ops->delay(substream,
1072                                                                     codec_dai));
1073         }
1074         delay += codec_delay;
1075
1076         /*
1077          * None of the existing platform drivers implement delay(), so
1078          * for now the codec_dai of first multicodec entry is used
1079          */
1080         if (platform->driver->delay)
1081                 delay += platform->driver->delay(substream, rtd->codec_dais[0]);
1082
1083         runtime->delay = delay;
1084
1085         return offset;
1086 }
1087
1088 /* connect a FE and BE */
1089 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1090                 struct snd_soc_pcm_runtime *be, int stream)
1091 {
1092         struct snd_soc_dpcm *dpcm;
1093
1094         /* only add new dpcms */
1095         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1096                 if (dpcm->be == be && dpcm->fe == fe)
1097                         return 0;
1098         }
1099
1100         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1101         if (!dpcm)
1102                 return -ENOMEM;
1103
1104         dpcm->be = be;
1105         dpcm->fe = fe;
1106         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1107         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1108         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1109         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1110
1111         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1112                         stream ? "capture" : "playback",  fe->dai_link->name,
1113                         stream ? "<-" : "->", be->dai_link->name);
1114
1115 #ifdef CONFIG_DEBUG_FS
1116         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1117                         fe->debugfs_dpcm_root, &dpcm->state);
1118 #endif
1119         return 1;
1120 }
1121
1122 /* reparent a BE onto another FE */
1123 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1124                         struct snd_soc_pcm_runtime *be, int stream)
1125 {
1126         struct snd_soc_dpcm *dpcm;
1127         struct snd_pcm_substream *fe_substream, *be_substream;
1128
1129         /* reparent if BE is connected to other FEs */
1130         if (!be->dpcm[stream].users)
1131                 return;
1132
1133         be_substream = snd_soc_dpcm_get_substream(be, stream);
1134
1135         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1136                 if (dpcm->fe == fe)
1137                         continue;
1138
1139                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1140                         stream ? "capture" : "playback",
1141                         dpcm->fe->dai_link->name,
1142                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1143
1144                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1145                 be_substream->runtime = fe_substream->runtime;
1146                 break;
1147         }
1148 }
1149
1150 /* disconnect a BE and FE */
1151 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1152 {
1153         struct snd_soc_dpcm *dpcm, *d;
1154
1155         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1156                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1157                                 stream ? "capture" : "playback",
1158                                 dpcm->be->dai_link->name);
1159
1160                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1161                         continue;
1162
1163                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1164                         stream ? "capture" : "playback", fe->dai_link->name,
1165                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1166
1167                 /* BEs still alive need new FE */
1168                 dpcm_be_reparent(fe, dpcm->be, stream);
1169
1170 #ifdef CONFIG_DEBUG_FS
1171                 debugfs_remove(dpcm->debugfs_state);
1172 #endif
1173                 list_del(&dpcm->list_be);
1174                 list_del(&dpcm->list_fe);
1175                 kfree(dpcm);
1176         }
1177 }
1178
1179 /* get BE for DAI widget and stream */
1180 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1181                 struct snd_soc_dapm_widget *widget, int stream)
1182 {
1183         struct snd_soc_pcm_runtime *be;
1184         int i, j;
1185
1186         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1187                 for (i = 0; i < card->num_links; i++) {
1188                         be = &card->rtd[i];
1189
1190                         if (!be->dai_link->no_pcm)
1191                                 continue;
1192
1193                         if (be->cpu_dai->playback_widget == widget)
1194                                 return be;
1195
1196                         for (j = 0; j < be->num_codecs; j++) {
1197                                 struct snd_soc_dai *dai = be->codec_dais[j];
1198                                 if (dai->playback_widget == widget)
1199                                         return be;
1200                         }
1201                 }
1202         } else {
1203
1204                 for (i = 0; i < card->num_links; i++) {
1205                         be = &card->rtd[i];
1206
1207                         if (!be->dai_link->no_pcm)
1208                                 continue;
1209
1210                         if (be->cpu_dai->capture_widget == widget)
1211                                 return be;
1212
1213                         for (j = 0; j < be->num_codecs; j++) {
1214                                 struct snd_soc_dai *dai = be->codec_dais[j];
1215                                 if (dai->capture_widget == widget)
1216                                         return be;
1217                         }
1218                 }
1219         }
1220
1221         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1222                 stream ? "capture" : "playback", widget->name);
1223         return NULL;
1224 }
1225
1226 static inline struct snd_soc_dapm_widget *
1227         dai_get_widget(struct snd_soc_dai *dai, int stream)
1228 {
1229         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1230                 return dai->playback_widget;
1231         else
1232                 return dai->capture_widget;
1233 }
1234
1235 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1236                 struct snd_soc_dapm_widget *widget)
1237 {
1238         int i;
1239
1240         for (i = 0; i < list->num_widgets; i++) {
1241                 if (widget == list->widgets[i])
1242                         return 1;
1243         }
1244
1245         return 0;
1246 }
1247
1248 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1249         int stream, struct snd_soc_dapm_widget_list **list_)
1250 {
1251         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1252         struct snd_soc_dapm_widget_list *list;
1253         int paths;
1254
1255         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
1256                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
1257         if (list == NULL)
1258                 return -ENOMEM;
1259
1260         /* get number of valid DAI paths and their widgets */
1261         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
1262
1263         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1264                         stream ? "capture" : "playback");
1265
1266         *list_ = list;
1267         return paths;
1268 }
1269
1270 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1271         struct snd_soc_dapm_widget_list **list_)
1272 {
1273         struct snd_soc_dpcm *dpcm;
1274         struct snd_soc_dapm_widget_list *list = *list_;
1275         struct snd_soc_dapm_widget *widget;
1276         int prune = 0;
1277
1278         /* Destroy any old FE <--> BE connections */
1279         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1280                 unsigned int i;
1281
1282                 /* is there a valid CPU DAI widget for this BE */
1283                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1284
1285                 /* prune the BE if it's no longer in our active list */
1286                 if (widget && widget_in_list(list, widget))
1287                         continue;
1288
1289                 /* is there a valid CODEC DAI widget for this BE */
1290                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1291                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1292                         widget = dai_get_widget(dai, stream);
1293
1294                         /* prune the BE if it's no longer in our active list */
1295                         if (widget && widget_in_list(list, widget))
1296                                 continue;
1297                 }
1298
1299                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1300                         stream ? "capture" : "playback",
1301                         dpcm->be->dai_link->name, fe->dai_link->name);
1302                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1303                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1304                 prune++;
1305         }
1306
1307         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1308         return prune;
1309 }
1310
1311 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1312         struct snd_soc_dapm_widget_list **list_)
1313 {
1314         struct snd_soc_card *card = fe->card;
1315         struct snd_soc_dapm_widget_list *list = *list_;
1316         struct snd_soc_pcm_runtime *be;
1317         int i, new = 0, err;
1318
1319         /* Create any new FE <--> BE connections */
1320         for (i = 0; i < list->num_widgets; i++) {
1321
1322                 switch (list->widgets[i]->id) {
1323                 case snd_soc_dapm_dai_in:
1324                 case snd_soc_dapm_dai_out:
1325                         break;
1326                 default:
1327                         continue;
1328                 }
1329
1330                 /* is there a valid BE rtd for this widget */
1331                 be = dpcm_get_be(card, list->widgets[i], stream);
1332                 if (!be) {
1333                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1334                                         list->widgets[i]->name);
1335                         continue;
1336                 }
1337
1338                 /* make sure BE is a real BE */
1339                 if (!be->dai_link->no_pcm)
1340                         continue;
1341
1342                 /* don't connect if FE is not running */
1343                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1344                         continue;
1345
1346                 /* newly connected FE and BE */
1347                 err = dpcm_be_connect(fe, be, stream);
1348                 if (err < 0) {
1349                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1350                                 list->widgets[i]->name);
1351                         break;
1352                 } else if (err == 0) /* already connected */
1353                         continue;
1354
1355                 /* new */
1356                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1357                 new++;
1358         }
1359
1360         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1361         return new;
1362 }
1363
1364 /*
1365  * Find the corresponding BE DAIs that source or sink audio to this
1366  * FE substream.
1367  */
1368 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1369         int stream, struct snd_soc_dapm_widget_list **list, int new)
1370 {
1371         if (new)
1372                 return dpcm_add_paths(fe, stream, list);
1373         else
1374                 return dpcm_prune_paths(fe, stream, list);
1375 }
1376
1377 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1378 {
1379         struct snd_soc_dpcm *dpcm;
1380
1381         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1382                 dpcm->be->dpcm[stream].runtime_update =
1383                                                 SND_SOC_DPCM_UPDATE_NO;
1384 }
1385
1386 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1387         int stream)
1388 {
1389         struct snd_soc_dpcm *dpcm;
1390
1391         /* disable any enabled and non active backends */
1392         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1393
1394                 struct snd_soc_pcm_runtime *be = dpcm->be;
1395                 struct snd_pcm_substream *be_substream =
1396                         snd_soc_dpcm_get_substream(be, stream);
1397
1398                 if (be->dpcm[stream].users == 0)
1399                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1400                                 stream ? "capture" : "playback",
1401                                 be->dpcm[stream].state);
1402
1403                 if (--be->dpcm[stream].users != 0)
1404                         continue;
1405
1406                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1407                         continue;
1408
1409                 soc_pcm_close(be_substream);
1410                 be_substream->runtime = NULL;
1411                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1412         }
1413 }
1414
1415 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1416 {
1417         struct snd_soc_dpcm *dpcm;
1418         int err, count = 0;
1419
1420         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1421         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1422
1423                 struct snd_soc_pcm_runtime *be = dpcm->be;
1424                 struct snd_pcm_substream *be_substream =
1425                         snd_soc_dpcm_get_substream(be, stream);
1426
1427                 if (!be_substream) {
1428                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1429                                 stream ? "capture" : "playback");
1430                         continue;
1431                 }
1432
1433                 /* is this op for this BE ? */
1434                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1435                         continue;
1436
1437                 /* first time the dpcm is open ? */
1438                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1439                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1440                                 stream ? "capture" : "playback",
1441                                 be->dpcm[stream].state);
1442
1443                 if (be->dpcm[stream].users++ != 0)
1444                         continue;
1445
1446                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1447                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1448                         continue;
1449
1450                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1451                         stream ? "capture" : "playback", be->dai_link->name);
1452
1453                 be_substream->runtime = be->dpcm[stream].runtime;
1454                 err = soc_pcm_open(be_substream);
1455                 if (err < 0) {
1456                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1457                         be->dpcm[stream].users--;
1458                         if (be->dpcm[stream].users < 0)
1459                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1460                                         stream ? "capture" : "playback",
1461                                         be->dpcm[stream].state);
1462
1463                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1464                         goto unwind;
1465                 }
1466
1467                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1468                 count++;
1469         }
1470
1471         return count;
1472
1473 unwind:
1474         /* disable any enabled and non active backends */
1475         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1476                 struct snd_soc_pcm_runtime *be = dpcm->be;
1477                 struct snd_pcm_substream *be_substream =
1478                         snd_soc_dpcm_get_substream(be, stream);
1479
1480                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1481                         continue;
1482
1483                 if (be->dpcm[stream].users == 0)
1484                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1485                                 stream ? "capture" : "playback",
1486                                 be->dpcm[stream].state);
1487
1488                 if (--be->dpcm[stream].users != 0)
1489                         continue;
1490
1491                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1492                         continue;
1493
1494                 soc_pcm_close(be_substream);
1495                 be_substream->runtime = NULL;
1496                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1497         }
1498
1499         return err;
1500 }
1501
1502 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1503         struct snd_soc_pcm_stream *stream)
1504 {
1505         runtime->hw.rate_min = stream->rate_min;
1506         runtime->hw.rate_max = stream->rate_max;
1507         runtime->hw.channels_min = stream->channels_min;
1508         runtime->hw.channels_max = stream->channels_max;
1509         if (runtime->hw.formats)
1510                 runtime->hw.formats &= stream->formats;
1511         else
1512                 runtime->hw.formats = stream->formats;
1513         runtime->hw.rates = stream->rates;
1514 }
1515
1516 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1517 {
1518         struct snd_pcm_runtime *runtime = substream->runtime;
1519         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1520         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1521         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1522
1523         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1524                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback);
1525         else
1526                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture);
1527 }
1528
1529 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1530
1531 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1532  * for avoiding the race with trigger callback.
1533  * If the state is unset and a trigger is pending while the previous operation,
1534  * process the pending trigger action here.
1535  */
1536 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1537                                      int stream, enum snd_soc_dpcm_update state)
1538 {
1539         struct snd_pcm_substream *substream =
1540                 snd_soc_dpcm_get_substream(fe, stream);
1541
1542         snd_pcm_stream_lock_irq(substream);
1543         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1544                 dpcm_fe_dai_do_trigger(substream,
1545                                        fe->dpcm[stream].trigger_pending - 1);
1546                 fe->dpcm[stream].trigger_pending = 0;
1547         }
1548         fe->dpcm[stream].runtime_update = state;
1549         snd_pcm_stream_unlock_irq(substream);
1550 }
1551
1552 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1553 {
1554         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1555         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1556         int stream = fe_substream->stream, ret = 0;
1557
1558         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1559
1560         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1561         if (ret < 0) {
1562                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1563                 goto be_err;
1564         }
1565
1566         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1567
1568         /* start the DAI frontend */
1569         ret = soc_pcm_open(fe_substream);
1570         if (ret < 0) {
1571                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1572                 goto unwind;
1573         }
1574
1575         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1576
1577         dpcm_set_fe_runtime(fe_substream);
1578         snd_pcm_limit_hw_rates(runtime);
1579
1580         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1581         return 0;
1582
1583 unwind:
1584         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1585 be_err:
1586         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1587         return ret;
1588 }
1589
1590 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1591 {
1592         struct snd_soc_dpcm *dpcm;
1593
1594         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1595         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1596
1597                 struct snd_soc_pcm_runtime *be = dpcm->be;
1598                 struct snd_pcm_substream *be_substream =
1599                         snd_soc_dpcm_get_substream(be, stream);
1600
1601                 /* is this op for this BE ? */
1602                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1603                         continue;
1604
1605                 if (be->dpcm[stream].users == 0)
1606                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1607                                 stream ? "capture" : "playback",
1608                                 be->dpcm[stream].state);
1609
1610                 if (--be->dpcm[stream].users != 0)
1611                         continue;
1612
1613                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1614                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1615                         continue;
1616
1617                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1618                         dpcm->fe->dai_link->name);
1619
1620                 soc_pcm_close(be_substream);
1621                 be_substream->runtime = NULL;
1622
1623                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1624         }
1625         return 0;
1626 }
1627
1628 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1629 {
1630         struct snd_soc_pcm_runtime *fe = substream->private_data;
1631         int stream = substream->stream;
1632
1633         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1634
1635         /* shutdown the BEs */
1636         dpcm_be_dai_shutdown(fe, substream->stream);
1637
1638         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1639
1640         /* now shutdown the frontend */
1641         soc_pcm_close(substream);
1642
1643         /* run the stream event for each BE */
1644         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1645
1646         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1647         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1648         return 0;
1649 }
1650
1651 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1652 {
1653         struct snd_soc_dpcm *dpcm;
1654
1655         /* only hw_params backends that are either sinks or sources
1656          * to this frontend DAI */
1657         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1658
1659                 struct snd_soc_pcm_runtime *be = dpcm->be;
1660                 struct snd_pcm_substream *be_substream =
1661                         snd_soc_dpcm_get_substream(be, stream);
1662
1663                 /* is this op for this BE ? */
1664                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1665                         continue;
1666
1667                 /* only free hw when no longer used - check all FEs */
1668                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1669                                 continue;
1670
1671                 /* do not free hw if this BE is used by other FE */
1672                 if (be->dpcm[stream].users > 1)
1673                         continue;
1674
1675                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1676                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1677                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1678                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1679                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1680                         continue;
1681
1682                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1683                         dpcm->fe->dai_link->name);
1684
1685                 soc_pcm_hw_free(be_substream);
1686
1687                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1688         }
1689
1690         return 0;
1691 }
1692
1693 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1694 {
1695         struct snd_soc_pcm_runtime *fe = substream->private_data;
1696         int err, stream = substream->stream;
1697
1698         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1699         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1700
1701         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1702
1703         /* call hw_free on the frontend */
1704         err = soc_pcm_hw_free(substream);
1705         if (err < 0)
1706                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1707                         fe->dai_link->name);
1708
1709         /* only hw_params backends that are either sinks or sources
1710          * to this frontend DAI */
1711         err = dpcm_be_dai_hw_free(fe, stream);
1712
1713         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1714         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1715
1716         mutex_unlock(&fe->card->mutex);
1717         return 0;
1718 }
1719
1720 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1721 {
1722         struct snd_soc_dpcm *dpcm;
1723         int ret;
1724
1725         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1726
1727                 struct snd_soc_pcm_runtime *be = dpcm->be;
1728                 struct snd_pcm_substream *be_substream =
1729                         snd_soc_dpcm_get_substream(be, stream);
1730
1731                 /* is this op for this BE ? */
1732                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1733                         continue;
1734
1735                 /* only allow hw_params() if no connected FEs are running */
1736                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1737                         continue;
1738
1739                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1740                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1741                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1742                         continue;
1743
1744                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1745                         dpcm->fe->dai_link->name);
1746
1747                 /* copy params for each dpcm */
1748                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1749                                 sizeof(struct snd_pcm_hw_params));
1750
1751                 /* perform any hw_params fixups */
1752                 if (be->dai_link->be_hw_params_fixup) {
1753                         ret = be->dai_link->be_hw_params_fixup(be,
1754                                         &dpcm->hw_params);
1755                         if (ret < 0) {
1756                                 dev_err(be->dev,
1757                                         "ASoC: hw_params BE fixup failed %d\n",
1758                                         ret);
1759                                 goto unwind;
1760                         }
1761                 }
1762
1763                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1764                 if (ret < 0) {
1765                         dev_err(dpcm->be->dev,
1766                                 "ASoC: hw_params BE failed %d\n", ret);
1767                         goto unwind;
1768                 }
1769
1770                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1771         }
1772         return 0;
1773
1774 unwind:
1775         /* disable any enabled and non active backends */
1776         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1777                 struct snd_soc_pcm_runtime *be = dpcm->be;
1778                 struct snd_pcm_substream *be_substream =
1779                         snd_soc_dpcm_get_substream(be, stream);
1780
1781                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1782                         continue;
1783
1784                 /* only allow hw_free() if no connected FEs are running */
1785                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1786                         continue;
1787
1788                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1789                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1790                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1791                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1792                         continue;
1793
1794                 soc_pcm_hw_free(be_substream);
1795         }
1796
1797         return ret;
1798 }
1799
1800 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1801                                  struct snd_pcm_hw_params *params)
1802 {
1803         struct snd_soc_pcm_runtime *fe = substream->private_data;
1804         int ret, stream = substream->stream;
1805
1806         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1807         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1808
1809         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1810                         sizeof(struct snd_pcm_hw_params));
1811         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1812         if (ret < 0) {
1813                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1814                 goto out;
1815         }
1816
1817         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1818                         fe->dai_link->name, params_rate(params),
1819                         params_channels(params), params_format(params));
1820
1821         /* call hw_params on the frontend */
1822         ret = soc_pcm_hw_params(substream, params);
1823         if (ret < 0) {
1824                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1825                 dpcm_be_dai_hw_free(fe, stream);
1826          } else
1827                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1828
1829 out:
1830         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1831         mutex_unlock(&fe->card->mutex);
1832         return ret;
1833 }
1834
1835 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1836                 struct snd_pcm_substream *substream, int cmd)
1837 {
1838         int ret;
1839
1840         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1841                         dpcm->fe->dai_link->name, cmd);
1842
1843         ret = soc_pcm_trigger(substream, cmd);
1844         if (ret < 0)
1845                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1846
1847         return ret;
1848 }
1849
1850 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1851                                int cmd)
1852 {
1853         struct snd_soc_dpcm *dpcm;
1854         int ret = 0;
1855
1856         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1857
1858                 struct snd_soc_pcm_runtime *be = dpcm->be;
1859                 struct snd_pcm_substream *be_substream =
1860                         snd_soc_dpcm_get_substream(be, stream);
1861
1862                 /* is this op for this BE ? */
1863                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1864                         continue;
1865
1866                 switch (cmd) {
1867                 case SNDRV_PCM_TRIGGER_START:
1868                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1869                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1870                                 continue;
1871
1872                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1873                         if (ret)
1874                                 return ret;
1875
1876                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1877                         break;
1878                 case SNDRV_PCM_TRIGGER_RESUME:
1879                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1880                                 continue;
1881
1882                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1883                         if (ret)
1884                                 return ret;
1885
1886                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1887                         break;
1888                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1889                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1890                                 continue;
1891
1892                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1893                         if (ret)
1894                                 return ret;
1895
1896                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1897                         break;
1898                 case SNDRV_PCM_TRIGGER_STOP:
1899                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1900                                 continue;
1901
1902                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1903                                 continue;
1904
1905                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1906                         if (ret)
1907                                 return ret;
1908
1909                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1910                         break;
1911                 case SNDRV_PCM_TRIGGER_SUSPEND:
1912                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1913                                 continue;
1914
1915                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1916                                 continue;
1917
1918                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1919                         if (ret)
1920                                 return ret;
1921
1922                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1923                         break;
1924                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1925                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1926                                 continue;
1927
1928                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1929                                 continue;
1930
1931                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1932                         if (ret)
1933                                 return ret;
1934
1935                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1936                         break;
1937                 }
1938         }
1939
1940         return ret;
1941 }
1942 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1943
1944 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
1945 {
1946         struct snd_soc_pcm_runtime *fe = substream->private_data;
1947         int stream = substream->stream, ret;
1948         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1949
1950         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1951
1952         switch (trigger) {
1953         case SND_SOC_DPCM_TRIGGER_PRE:
1954                 /* call trigger on the frontend before the backend. */
1955
1956                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1957                                 fe->dai_link->name, cmd);
1958
1959                 ret = soc_pcm_trigger(substream, cmd);
1960                 if (ret < 0) {
1961                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1962                         goto out;
1963                 }
1964
1965                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1966                 break;
1967         case SND_SOC_DPCM_TRIGGER_POST:
1968                 /* call trigger on the frontend after the backend. */
1969
1970                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1971                 if (ret < 0) {
1972                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1973                         goto out;
1974                 }
1975
1976                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1977                                 fe->dai_link->name, cmd);
1978
1979                 ret = soc_pcm_trigger(substream, cmd);
1980                 break;
1981         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1982                 /* bespoke trigger() - handles both FE and BEs */
1983
1984                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1985                                 fe->dai_link->name, cmd);
1986
1987                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1988                 if (ret < 0) {
1989                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1990                         goto out;
1991                 }
1992                 break;
1993         default:
1994                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1995                                 fe->dai_link->name);
1996                 ret = -EINVAL;
1997                 goto out;
1998         }
1999
2000         switch (cmd) {
2001         case SNDRV_PCM_TRIGGER_START:
2002         case SNDRV_PCM_TRIGGER_RESUME:
2003         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2004                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2005                 break;
2006         case SNDRV_PCM_TRIGGER_STOP:
2007         case SNDRV_PCM_TRIGGER_SUSPEND:
2008         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2009                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2010                 break;
2011         }
2012
2013 out:
2014         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2015         return ret;
2016 }
2017
2018 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2019 {
2020         struct snd_soc_pcm_runtime *fe = substream->private_data;
2021         int stream = substream->stream;
2022
2023         /* if FE's runtime_update is already set, we're in race;
2024          * process this trigger later at exit
2025          */
2026         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2027                 fe->dpcm[stream].trigger_pending = cmd + 1;
2028                 return 0; /* delayed, assuming it's successful */
2029         }
2030
2031         /* we're alone, let's trigger */
2032         return dpcm_fe_dai_do_trigger(substream, cmd);
2033 }
2034
2035 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2036 {
2037         struct snd_soc_dpcm *dpcm;
2038         int ret = 0;
2039
2040         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2041
2042                 struct snd_soc_pcm_runtime *be = dpcm->be;
2043                 struct snd_pcm_substream *be_substream =
2044                         snd_soc_dpcm_get_substream(be, stream);
2045
2046                 /* is this op for this BE ? */
2047                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2048                         continue;
2049
2050                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2051                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2052                         continue;
2053
2054                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2055                         dpcm->fe->dai_link->name);
2056
2057                 ret = soc_pcm_prepare(be_substream);
2058                 if (ret < 0) {
2059                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2060                                 ret);
2061                         break;
2062                 }
2063
2064                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2065         }
2066         return ret;
2067 }
2068
2069 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2070 {
2071         struct snd_soc_pcm_runtime *fe = substream->private_data;
2072         int stream = substream->stream, ret = 0;
2073
2074         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2075
2076         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2077
2078         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2079
2080         /* there is no point preparing this FE if there are no BEs */
2081         if (list_empty(&fe->dpcm[stream].be_clients)) {
2082                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2083                                 fe->dai_link->name);
2084                 ret = -EINVAL;
2085                 goto out;
2086         }
2087
2088         ret = dpcm_be_dai_prepare(fe, substream->stream);
2089         if (ret < 0)
2090                 goto out;
2091
2092         /* call prepare on the frontend */
2093         ret = soc_pcm_prepare(substream);
2094         if (ret < 0) {
2095                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2096                         fe->dai_link->name);
2097                 goto out;
2098         }
2099
2100         /* run the stream event for each BE */
2101         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2102         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2103
2104 out:
2105         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2106         mutex_unlock(&fe->card->mutex);
2107
2108         return ret;
2109 }
2110
2111 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2112                      unsigned int cmd, void *arg)
2113 {
2114         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2115         struct snd_soc_platform *platform = rtd->platform;
2116
2117         if (platform->driver->ops && platform->driver->ops->ioctl)
2118                 return platform->driver->ops->ioctl(substream, cmd, arg);
2119         return snd_pcm_lib_ioctl(substream, cmd, arg);
2120 }
2121
2122 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2123 {
2124         struct snd_pcm_substream *substream =
2125                 snd_soc_dpcm_get_substream(fe, stream);
2126         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2127         int err;
2128
2129         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2130                         stream ? "capture" : "playback", fe->dai_link->name);
2131
2132         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2133                 /* call bespoke trigger - FE takes care of all BE triggers */
2134                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2135                                 fe->dai_link->name);
2136
2137                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2138                 if (err < 0)
2139                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2140         } else {
2141                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2142                         fe->dai_link->name);
2143
2144                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2145                 if (err < 0)
2146                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2147         }
2148
2149         err = dpcm_be_dai_hw_free(fe, stream);
2150         if (err < 0)
2151                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2152
2153         err = dpcm_be_dai_shutdown(fe, stream);
2154         if (err < 0)
2155                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2156
2157         /* run the stream event for each BE */
2158         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2159
2160         return 0;
2161 }
2162
2163 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2164 {
2165         struct snd_pcm_substream *substream =
2166                 snd_soc_dpcm_get_substream(fe, stream);
2167         struct snd_soc_dpcm *dpcm;
2168         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2169         int ret;
2170
2171         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2172                         stream ? "capture" : "playback", fe->dai_link->name);
2173
2174         /* Only start the BE if the FE is ready */
2175         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2176                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2177                 return -EINVAL;
2178
2179         /* startup must always be called for new BEs */
2180         ret = dpcm_be_dai_startup(fe, stream);
2181         if (ret < 0)
2182                 goto disconnect;
2183
2184         /* keep going if FE state is > open */
2185         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2186                 return 0;
2187
2188         ret = dpcm_be_dai_hw_params(fe, stream);
2189         if (ret < 0)
2190                 goto close;
2191
2192         /* keep going if FE state is > hw_params */
2193         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2194                 return 0;
2195
2196
2197         ret = dpcm_be_dai_prepare(fe, stream);
2198         if (ret < 0)
2199                 goto hw_free;
2200
2201         /* run the stream event for each BE */
2202         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2203
2204         /* keep going if FE state is > prepare */
2205         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2206                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2207                 return 0;
2208
2209         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2210                 /* call trigger on the frontend - FE takes care of all BE triggers */
2211                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2212                                 fe->dai_link->name);
2213
2214                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2215                 if (ret < 0) {
2216                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2217                         goto hw_free;
2218                 }
2219         } else {
2220                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2221                         fe->dai_link->name);
2222
2223                 ret = dpcm_be_dai_trigger(fe, stream,
2224                                         SNDRV_PCM_TRIGGER_START);
2225                 if (ret < 0) {
2226                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2227                         goto hw_free;
2228                 }
2229         }
2230
2231         return 0;
2232
2233 hw_free:
2234         dpcm_be_dai_hw_free(fe, stream);
2235 close:
2236         dpcm_be_dai_shutdown(fe, stream);
2237 disconnect:
2238         /* disconnect any non started BEs */
2239         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2240                 struct snd_soc_pcm_runtime *be = dpcm->be;
2241                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2242                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2243         }
2244
2245         return ret;
2246 }
2247
2248 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2249 {
2250         int ret;
2251
2252         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2253         ret = dpcm_run_update_startup(fe, stream);
2254         if (ret < 0)
2255                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2256         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2257
2258         return ret;
2259 }
2260
2261 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2262 {
2263         int ret;
2264
2265         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2266         ret = dpcm_run_update_shutdown(fe, stream);
2267         if (ret < 0)
2268                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2269         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2270
2271         return ret;
2272 }
2273
2274 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2275  * any DAI links.
2276  */
2277 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2278 {
2279         int i, old, new, paths;
2280
2281         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2282         for (i = 0; i < card->num_rtd; i++) {
2283                 struct snd_soc_dapm_widget_list *list;
2284                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
2285
2286                 /* make sure link is FE */
2287                 if (!fe->dai_link->dynamic)
2288                         continue;
2289
2290                 /* only check active links */
2291                 if (!fe->cpu_dai->active)
2292                         continue;
2293
2294                 /* DAPM sync will call this to update DSP paths */
2295                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2296                         fe->dai_link->name);
2297
2298                 /* skip if FE doesn't have playback capability */
2299                 if (!fe->cpu_dai->driver->playback.channels_min
2300                     || !fe->codec_dai->driver->playback.channels_min)
2301                         goto capture;
2302
2303                 /* skip if FE isn't currently playing */
2304                 if (!fe->cpu_dai->playback_active
2305                     || !fe->codec_dai->playback_active)
2306                         goto capture;
2307
2308                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2309                 if (paths < 0) {
2310                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2311                                         fe->dai_link->name,  "playback");
2312                         mutex_unlock(&card->mutex);
2313                         return paths;
2314                 }
2315
2316                 /* update any new playback paths */
2317                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2318                 if (new) {
2319                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2320                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2321                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2322                 }
2323
2324                 /* update any old playback paths */
2325                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2326                 if (old) {
2327                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2328                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2329                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2330                 }
2331
2332                 dpcm_path_put(&list);
2333 capture:
2334                 /* skip if FE doesn't have capture capability */
2335                 if (!fe->cpu_dai->driver->capture.channels_min
2336                     || !fe->codec_dai->driver->capture.channels_min)
2337                         continue;
2338
2339                 /* skip if FE isn't currently capturing */
2340                 if (!fe->cpu_dai->capture_active
2341                     || !fe->codec_dai->capture_active)
2342                         continue;
2343
2344                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2345                 if (paths < 0) {
2346                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2347                                         fe->dai_link->name,  "capture");
2348                         mutex_unlock(&card->mutex);
2349                         return paths;
2350                 }
2351
2352                 /* update any new capture paths */
2353                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2354                 if (new) {
2355                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2356                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2357                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2358                 }
2359
2360                 /* update any old capture paths */
2361                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2362                 if (old) {
2363                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2364                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2365                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2366                 }
2367
2368                 dpcm_path_put(&list);
2369         }
2370
2371         mutex_unlock(&card->mutex);
2372         return 0;
2373 }
2374 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2375 {
2376         struct snd_soc_dpcm *dpcm;
2377         struct list_head *clients =
2378                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2379
2380         list_for_each_entry(dpcm, clients, list_be) {
2381
2382                 struct snd_soc_pcm_runtime *be = dpcm->be;
2383                 int i;
2384
2385                 if (be->dai_link->ignore_suspend)
2386                         continue;
2387
2388                 for (i = 0; i < be->num_codecs; i++) {
2389                         struct snd_soc_dai *dai = be->codec_dais[i];
2390                         struct snd_soc_dai_driver *drv = dai->driver;
2391
2392                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2393                                          be->dai_link->name);
2394
2395                         if (drv->ops && drv->ops->digital_mute &&
2396                                                         dai->playback_active)
2397                                 drv->ops->digital_mute(dai, mute);
2398                 }
2399         }
2400
2401         return 0;
2402 }
2403
2404 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2405 {
2406         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2407         struct snd_soc_dpcm *dpcm;
2408         struct snd_soc_dapm_widget_list *list;
2409         int ret;
2410         int stream = fe_substream->stream;
2411
2412         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2413         fe->dpcm[stream].runtime = fe_substream->runtime;
2414
2415         ret = dpcm_path_get(fe, stream, &list);
2416         if (ret < 0) {
2417                 mutex_unlock(&fe->card->mutex);
2418                 return ret;
2419         } else if (ret == 0) {
2420                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2421                         fe->dai_link->name, stream ? "capture" : "playback");
2422         }
2423
2424         /* calculate valid and active FE <-> BE dpcms */
2425         dpcm_process_paths(fe, stream, &list, 1);
2426
2427         ret = dpcm_fe_dai_startup(fe_substream);
2428         if (ret < 0) {
2429                 /* clean up all links */
2430                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2431                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2432
2433                 dpcm_be_disconnect(fe, stream);
2434                 fe->dpcm[stream].runtime = NULL;
2435         }
2436
2437         dpcm_clear_pending_state(fe, stream);
2438         dpcm_path_put(&list);
2439         mutex_unlock(&fe->card->mutex);
2440         return ret;
2441 }
2442
2443 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2444 {
2445         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2446         struct snd_soc_dpcm *dpcm;
2447         int stream = fe_substream->stream, ret;
2448
2449         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2450         ret = dpcm_fe_dai_shutdown(fe_substream);
2451
2452         /* mark FE's links ready to prune */
2453         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2454                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2455
2456         dpcm_be_disconnect(fe, stream);
2457
2458         fe->dpcm[stream].runtime = NULL;
2459         mutex_unlock(&fe->card->mutex);
2460         return ret;
2461 }
2462
2463 /* create a new pcm */
2464 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2465 {
2466         struct snd_soc_platform *platform = rtd->platform;
2467         struct snd_soc_dai *codec_dai;
2468         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2469         struct snd_pcm *pcm;
2470         char new_name[64];
2471         int ret = 0, playback = 0, capture = 0;
2472         int i;
2473
2474         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2475                 playback = rtd->dai_link->dpcm_playback;
2476                 capture = rtd->dai_link->dpcm_capture;
2477         } else {
2478                 for (i = 0; i < rtd->num_codecs; i++) {
2479                         codec_dai = rtd->codec_dais[i];
2480                         if (codec_dai->driver->playback.channels_min)
2481                                 playback = 1;
2482                         if (codec_dai->driver->capture.channels_min)
2483                                 capture = 1;
2484                 }
2485
2486                 capture = capture && cpu_dai->driver->capture.channels_min;
2487                 playback = playback && cpu_dai->driver->playback.channels_min;
2488         }
2489
2490         if (rtd->dai_link->playback_only) {
2491                 playback = 1;
2492                 capture = 0;
2493         }
2494
2495         if (rtd->dai_link->capture_only) {
2496                 playback = 0;
2497                 capture = 1;
2498         }
2499
2500         /* create the PCM */
2501         if (rtd->dai_link->no_pcm) {
2502                 snprintf(new_name, sizeof(new_name), "(%s)",
2503                         rtd->dai_link->stream_name);
2504
2505                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2506                                 playback, capture, &pcm);
2507         } else {
2508                 if (rtd->dai_link->dynamic)
2509                         snprintf(new_name, sizeof(new_name), "%s (*)",
2510                                 rtd->dai_link->stream_name);
2511                 else
2512                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2513                                 rtd->dai_link->stream_name,
2514                                 (rtd->num_codecs > 1) ?
2515                                 "multicodec" : rtd->codec_dai->name, num);
2516
2517                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2518                         capture, &pcm);
2519         }
2520         if (ret < 0) {
2521                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2522                         rtd->dai_link->name);
2523                 return ret;
2524         }
2525         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2526
2527         /* DAPM dai link stream work */
2528         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2529
2530         rtd->pcm = pcm;
2531         pcm->private_data = rtd;
2532
2533         if (rtd->dai_link->no_pcm) {
2534                 if (playback)
2535                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2536                 if (capture)
2537                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2538                 goto out;
2539         }
2540
2541         /* ASoC PCM operations */
2542         if (rtd->dai_link->dynamic) {
2543                 rtd->ops.open           = dpcm_fe_dai_open;
2544                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2545                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2546                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2547                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2548                 rtd->ops.close          = dpcm_fe_dai_close;
2549                 rtd->ops.pointer        = soc_pcm_pointer;
2550                 rtd->ops.ioctl          = soc_pcm_ioctl;
2551         } else {
2552                 rtd->ops.open           = soc_pcm_open;
2553                 rtd->ops.hw_params      = soc_pcm_hw_params;
2554                 rtd->ops.prepare        = soc_pcm_prepare;
2555                 rtd->ops.trigger        = soc_pcm_trigger;
2556                 rtd->ops.hw_free        = soc_pcm_hw_free;
2557                 rtd->ops.close          = soc_pcm_close;
2558                 rtd->ops.pointer        = soc_pcm_pointer;
2559                 rtd->ops.ioctl          = soc_pcm_ioctl;
2560         }
2561
2562         if (platform->driver->ops) {
2563                 rtd->ops.ack            = platform->driver->ops->ack;
2564                 rtd->ops.copy           = platform->driver->ops->copy;
2565                 rtd->ops.silence        = platform->driver->ops->silence;
2566                 rtd->ops.page           = platform->driver->ops->page;
2567                 rtd->ops.mmap           = platform->driver->ops->mmap;
2568         }
2569
2570         if (playback)
2571                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2572
2573         if (capture)
2574                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2575
2576         if (platform->driver->pcm_new) {
2577                 ret = platform->driver->pcm_new(rtd);
2578                 if (ret < 0) {
2579                         dev_err(platform->dev,
2580                                 "ASoC: pcm constructor failed: %d\n",
2581                                 ret);
2582                         return ret;
2583                 }
2584         }
2585
2586         pcm->private_free = platform->driver->pcm_free;
2587 out:
2588         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2589                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2590                  cpu_dai->name);
2591         return ret;
2592 }
2593
2594 /* is the current PCM operation for this FE ? */
2595 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2596 {
2597         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2598                 return 1;
2599         return 0;
2600 }
2601 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2602
2603 /* is the current PCM operation for this BE ? */
2604 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2605                 struct snd_soc_pcm_runtime *be, int stream)
2606 {
2607         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2608            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2609                   be->dpcm[stream].runtime_update))
2610                 return 1;
2611         return 0;
2612 }
2613 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2614
2615 /* get the substream for this BE */
2616 struct snd_pcm_substream *
2617         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2618 {
2619         return be->pcm->streams[stream].substream;
2620 }
2621 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2622
2623 /* get the BE runtime state */
2624 enum snd_soc_dpcm_state
2625         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2626 {
2627         return be->dpcm[stream].state;
2628 }
2629 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2630
2631 /* set the BE runtime state */
2632 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2633                 int stream, enum snd_soc_dpcm_state state)
2634 {
2635         be->dpcm[stream].state = state;
2636 }
2637 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2638
2639 /*
2640  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2641  * are not running, paused or suspended for the specified stream direction.
2642  */
2643 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2644                 struct snd_soc_pcm_runtime *be, int stream)
2645 {
2646         struct snd_soc_dpcm *dpcm;
2647         int state;
2648
2649         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2650
2651                 if (dpcm->fe == fe)
2652                         continue;
2653
2654                 state = dpcm->fe->dpcm[stream].state;
2655                 if (state == SND_SOC_DPCM_STATE_START ||
2656                         state == SND_SOC_DPCM_STATE_PAUSED ||
2657                         state == SND_SOC_DPCM_STATE_SUSPEND)
2658                         return 0;
2659         }
2660
2661         /* it's safe to free/stop this BE DAI */
2662         return 1;
2663 }
2664 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2665
2666 /*
2667  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2668  * running, paused or suspended for the specified stream direction.
2669  */
2670 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2671                 struct snd_soc_pcm_runtime *be, int stream)
2672 {
2673         struct snd_soc_dpcm *dpcm;
2674         int state;
2675
2676         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2677
2678                 if (dpcm->fe == fe)
2679                         continue;
2680
2681                 state = dpcm->fe->dpcm[stream].state;
2682                 if (state == SND_SOC_DPCM_STATE_START ||
2683                         state == SND_SOC_DPCM_STATE_PAUSED ||
2684                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2685                         state == SND_SOC_DPCM_STATE_PREPARE)
2686                         return 0;
2687         }
2688
2689         /* it's safe to change hw_params */
2690         return 1;
2691 }
2692 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2693
2694 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2695                 int cmd, struct snd_soc_platform *platform)
2696 {
2697         if (platform->driver->ops && platform->driver->ops->trigger)
2698                 return platform->driver->ops->trigger(substream, cmd);
2699         return 0;
2700 }
2701 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2702
2703 #ifdef CONFIG_DEBUG_FS
2704 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2705 {
2706         switch (state) {
2707         case SND_SOC_DPCM_STATE_NEW:
2708                 return "new";
2709         case SND_SOC_DPCM_STATE_OPEN:
2710                 return "open";
2711         case SND_SOC_DPCM_STATE_HW_PARAMS:
2712                 return "hw_params";
2713         case SND_SOC_DPCM_STATE_PREPARE:
2714                 return "prepare";
2715         case SND_SOC_DPCM_STATE_START:
2716                 return "start";
2717         case SND_SOC_DPCM_STATE_STOP:
2718                 return "stop";
2719         case SND_SOC_DPCM_STATE_SUSPEND:
2720                 return "suspend";
2721         case SND_SOC_DPCM_STATE_PAUSED:
2722                 return "paused";
2723         case SND_SOC_DPCM_STATE_HW_FREE:
2724                 return "hw_free";
2725         case SND_SOC_DPCM_STATE_CLOSE:
2726                 return "close";
2727         }
2728
2729         return "unknown";
2730 }
2731
2732 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2733                                 int stream, char *buf, size_t size)
2734 {
2735         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2736         struct snd_soc_dpcm *dpcm;
2737         ssize_t offset = 0;
2738
2739         /* FE state */
2740         offset += snprintf(buf + offset, size - offset,
2741                         "[%s - %s]\n", fe->dai_link->name,
2742                         stream ? "Capture" : "Playback");
2743
2744         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2745                         dpcm_state_string(fe->dpcm[stream].state));
2746
2747         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2748             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2749                 offset += snprintf(buf + offset, size - offset,
2750                                 "Hardware Params: "
2751                                 "Format = %s, Channels = %d, Rate = %d\n",
2752                                 snd_pcm_format_name(params_format(params)),
2753                                 params_channels(params),
2754                                 params_rate(params));
2755
2756         /* BEs state */
2757         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2758
2759         if (list_empty(&fe->dpcm[stream].be_clients)) {
2760                 offset += snprintf(buf + offset, size - offset,
2761                                 " No active DSP links\n");
2762                 goto out;
2763         }
2764
2765         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2766                 struct snd_soc_pcm_runtime *be = dpcm->be;
2767                 params = &dpcm->hw_params;
2768
2769                 offset += snprintf(buf + offset, size - offset,
2770                                 "- %s\n", be->dai_link->name);
2771
2772                 offset += snprintf(buf + offset, size - offset,
2773                                 "   State: %s\n",
2774                                 dpcm_state_string(be->dpcm[stream].state));
2775
2776                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2777                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2778                         offset += snprintf(buf + offset, size - offset,
2779                                 "   Hardware Params: "
2780                                 "Format = %s, Channels = %d, Rate = %d\n",
2781                                 snd_pcm_format_name(params_format(params)),
2782                                 params_channels(params),
2783                                 params_rate(params));
2784         }
2785
2786 out:
2787         return offset;
2788 }
2789
2790 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2791                                 size_t count, loff_t *ppos)
2792 {
2793         struct snd_soc_pcm_runtime *fe = file->private_data;
2794         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2795         char *buf;
2796
2797         buf = kmalloc(out_count, GFP_KERNEL);
2798         if (!buf)
2799                 return -ENOMEM;
2800
2801         if (fe->cpu_dai->driver->playback.channels_min)
2802                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2803                                         buf + offset, out_count - offset);
2804
2805         if (fe->cpu_dai->driver->capture.channels_min)
2806                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2807                                         buf + offset, out_count - offset);
2808
2809         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2810
2811         kfree(buf);
2812         return ret;
2813 }
2814
2815 static const struct file_operations dpcm_state_fops = {
2816         .open = simple_open,
2817         .read = dpcm_state_read_file,
2818         .llseek = default_llseek,
2819 };
2820
2821 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2822 {
2823         if (!rtd->dai_link)
2824                 return 0;
2825
2826         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2827                         rtd->card->debugfs_card_root);
2828         if (!rtd->debugfs_dpcm_root) {
2829                 dev_dbg(rtd->dev,
2830                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2831                          rtd->dai_link->name);
2832                 return -EINVAL;
2833         }
2834
2835         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2836                                                 rtd->debugfs_dpcm_root,
2837                                                 rtd, &dpcm_state_fops);
2838
2839         return 0;
2840 }
2841 #endif