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_dai_stream_valid() - check if a DAI supports the given stream
  39  *
  40  * Returns true if the DAI supports the indicated stream type.
  41  */
  42 static bool snd_soc_dai_stream_valid(struct snd_soc_dai *dai, int stream)
  43 {
  44         struct snd_soc_pcm_stream *codec_stream;
  45
  46         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
  47                 codec_stream = &dai->driver->playback;
  48         else
  49                 codec_stream = &dai->driver->capture;
  50
  51         /* If the codec specifies any rate at all, it supports the stream. */
  52         return codec_stream->rates;
  53 }
  54
  55 /**
  56  * snd_soc_runtime_activate() - Increment active count for PCM runtime components
  57  * @rtd: ASoC PCM runtime that is activated
  58  * @stream: Direction of the PCM stream
  59  *
  60  * Increments the active count for all the DAIs and components attached to a PCM
  61  * runtime. Should typically be called when a stream is opened.
  62  *
  63  * Must be called with the rtd->pcm_mutex being held
  64  */
  65 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
  66 {
  67         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  68         int i;
  69
  70         lockdep_assert_held(&rtd->pcm_mutex);
  71
  72         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  73                 cpu_dai->playback_active++;
  74                 for (i = 0; i < rtd->num_codecs; i++)
  75                         rtd->codec_dais[i]->playback_active++;
  76         } else {
  77                 cpu_dai->capture_active++;
  78                 for (i = 0; i < rtd->num_codecs; i++)
  79                         rtd->codec_dais[i]->capture_active++;
  80         }
  81
  82         cpu_dai->active++;
  83         cpu_dai->component->active++;
  84         for (i = 0; i < rtd->num_codecs; i++) {
  85                 rtd->codec_dais[i]->active++;
  86                 rtd->codec_dais[i]->component->active++;
  87         }
  88 }
  89
  90 /**
  91  * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
  92  * @rtd: ASoC PCM runtime that is deactivated
  93  * @stream: Direction of the PCM stream
  94  *
  95  * Decrements the active count for all the DAIs and components attached to a PCM
  96  * runtime. Should typically be called when a stream is closed.
  97  *
  98  * Must be called with the rtd->pcm_mutex being held
  99  */
 100 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
 101 {
 102         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 103         int i;
 104
 105         lockdep_assert_held(&rtd->pcm_mutex);
 106
 107         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 108                 cpu_dai->playback_active--;
 109                 for (i = 0; i < rtd->num_codecs; i++)
 110                         rtd->codec_dais[i]->playback_active--;
 111         } else {
 112                 cpu_dai->capture_active--;
 113                 for (i = 0; i < rtd->num_codecs; i++)
 114                         rtd->codec_dais[i]->capture_active--;
 115         }
 116
 117         cpu_dai->active--;
 118         cpu_dai->component->active--;
 119         for (i = 0; i < rtd->num_codecs; i++) {
 120                 rtd->codec_dais[i]->component->active--;
 121                 rtd->codec_dais[i]->active--;
 122         }
 123 }
 124
 125 /**
 126  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 127  * @rtd: The ASoC PCM runtime that should be checked.
 128  *
 129  * This function checks whether the power down delay should be ignored for a
 130  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 131  * been configured to ignore the delay, or if none of the components benefits
 132  * from having the delay.
 133  */
 134 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 135 {
 136         int i;
 137         bool ignore = true;
 138
 139         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 140                 return true;
 141
 142         for (i = 0; i < rtd->num_codecs; i++)
 143                 ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time;
 144
 145         return rtd->cpu_dai->component->ignore_pmdown_time && ignore;
 146 }
 147
 148 /**
 149  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 150  * @substream: the pcm substream
 151  * @hw: the hardware parameters
 152  *
 153  * Sets the substream runtime hardware parameters.
 154  */
 155 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 156         const struct snd_pcm_hardware *hw)
 157 {
 158         struct snd_pcm_runtime *runtime = substream->runtime;
 159         runtime->hw.info = hw->info;
 160         runtime->hw.formats = hw->formats;
 161         runtime->hw.period_bytes_min = hw->period_bytes_min;
 162         runtime->hw.period_bytes_max = hw->period_bytes_max;
 163         runtime->hw.periods_min = hw->periods_min;
 164         runtime->hw.periods_max = hw->periods_max;
 165         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
 166         runtime->hw.fifo_size = hw->fifo_size;
 167         return 0;
 168 }
 169 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 170
 171 /* DPCM stream event, send event to FE and all active BEs. */
 172 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 173         int event)
 174 {
 175         struct snd_soc_dpcm *dpcm;
 176
 177         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
 178
 179                 struct snd_soc_pcm_runtime *be = dpcm->be;
 180
 181                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 182                                 be->dai_link->name, event, dir);
 183
 184                 snd_soc_dapm_stream_event(be, dir, event);
 185         }
 186
 187         snd_soc_dapm_stream_event(fe, dir, event);
 188
 189         return 0;
 190 }
 191
 192 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 193                                         struct snd_soc_dai *soc_dai)
 194 {
 195         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 196         int ret;
 197
 198         if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
 199                                 rtd->dai_link->symmetric_rates)) {
 200                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
 201                                 soc_dai->rate);
 202
 203                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 204                                                 SNDRV_PCM_HW_PARAM_RATE,
 205                                                 soc_dai->rate);
 206                 if (ret < 0) {
 207                         dev_err(soc_dai->dev,
 208                                 "ASoC: Unable to apply rate constraint: %d\n",
 209                                 ret);
 210                         return ret;
 211                 }
 212         }
 213
 214         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
 215                                 rtd->dai_link->symmetric_channels)) {
 216                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
 217                                 soc_dai->channels);
 218
 219                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 220                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
 221                                                 soc_dai->channels);
 222                 if (ret < 0) {
 223                         dev_err(soc_dai->dev,
 224                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
 225                                 ret);
 226                         return ret;
 227                 }
 228         }
 229
 230         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
 231                                 rtd->dai_link->symmetric_samplebits)) {
 232                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
 233                                 soc_dai->sample_bits);
 234
 235                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 236                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
 237                                                 soc_dai->sample_bits);
 238                 if (ret < 0) {
 239                         dev_err(soc_dai->dev,
 240                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
 241                                 ret);
 242                         return ret;
 243                 }
 244         }
 245
 246         return 0;
 247 }
 248
 249 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 250                                 struct snd_pcm_hw_params *params)
 251 {
 252         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 253         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 254         unsigned int rate, channels, sample_bits, symmetry, i;
 255
 256         rate = params_rate(params);
 257         channels = params_channels(params);
 258         sample_bits = snd_pcm_format_physical_width(params_format(params));
 259
 260         /* reject unmatched parameters when applying symmetry */
 261         symmetry = cpu_dai->driver->symmetric_rates ||
 262                 rtd->dai_link->symmetric_rates;
 263
 264         for (i = 0; i < rtd->num_codecs; i++)
 265                 symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;
 266
 267         if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
 268                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
 269                                 cpu_dai->rate, rate);
 270                 return -EINVAL;
 271         }
 272
 273         symmetry = cpu_dai->driver->symmetric_channels ||
 274                 rtd->dai_link->symmetric_channels;
 275
 276         for (i = 0; i < rtd->num_codecs; i++)
 277                 symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;
 278
 279         if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
 280                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
 281                                 cpu_dai->channels, channels);
 282                 return -EINVAL;
 283         }
 284
 285         symmetry = cpu_dai->driver->symmetric_samplebits ||
 286                 rtd->dai_link->symmetric_samplebits;
 287
 288         for (i = 0; i < rtd->num_codecs; i++)
 289                 symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;
 290
 291         if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
 292                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
 293                                 cpu_dai->sample_bits, sample_bits);
 294                 return -EINVAL;
 295         }
 296
 297         return 0;
 298 }
 299
 300 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
 301 {
 302         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 303         struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
 304         struct snd_soc_dai_link *link = rtd->dai_link;
 305         unsigned int symmetry, i;
 306
 307         symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
 308                 cpu_driver->symmetric_channels || link->symmetric_channels ||
 309                 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
 310
 311         for (i = 0; i < rtd->num_codecs; i++)
 312                 symmetry = symmetry ||
 313                         rtd->codec_dais[i]->driver->symmetric_rates ||
 314                         rtd->codec_dais[i]->driver->symmetric_channels ||
 315                         rtd->codec_dais[i]->driver->symmetric_samplebits;
 316
 317         return symmetry;
 318 }
 319
 320 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 321 {
 322         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 323         int ret;
 324
 325         if (!bits)
 326                 return;
 327
 328         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 329         if (ret != 0)
 330                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 331                                  bits, ret);
 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
 391                 /*
 392                  * Skip CODECs which don't support the current stream type.
 393                  * Otherwise, since the rate, channel, and format values will
 394                  * zero in that case, we would have no usable settings left,
 395                  * causing the resulting setup to fail.
 396                  * At least one CODEC should match, otherwise we should have
 397                  * bailed out on a higher level, since there would be no
 398                  * CODEC to support the transfer direction in that case.
 399                  */
 400                 if (!snd_soc_dai_stream_valid(rtd->codec_dais[i],
 401                                               substream->stream))
 402                         continue;
 403
 404                 codec_dai_drv = rtd->codec_dais[i]->driver;
 405                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 406                         codec_stream = &codec_dai_drv->playback;
 407                 else
 408                         codec_stream = &codec_dai_drv->capture;
 409                 chan_min = max(chan_min, codec_stream->channels_min);
 410                 chan_max = min(chan_max, codec_stream->channels_max);
 411                 rate_min = max(rate_min, codec_stream->rate_min);
 412                 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
 413                 formats &= codec_stream->formats;
 414                 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
 415         }
 416
 417         /*
 418          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 419          * connected to a single CPU DAI, use CPU DAI's directly and let
 420          * channel allocation be fixed up later
 421          */
 422         if (rtd->num_codecs > 1) {
 423                 chan_min = cpu_stream->channels_min;
 424                 chan_max = cpu_stream->channels_max;
 425         }
 426
 427         hw->channels_min = max(chan_min, cpu_stream->channels_min);
 428         hw->channels_max = min(chan_max, cpu_stream->channels_max);
 429         if (hw->formats)
 430                 hw->formats &= formats & cpu_stream->formats;
 431         else
 432                 hw->formats = formats & cpu_stream->formats;
 433         hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
 434
 435         snd_pcm_limit_hw_rates(runtime);
 436
 437         hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
 438         hw->rate_min = max(hw->rate_min, rate_min);
 439         hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
 440         hw->rate_max = min_not_zero(hw->rate_max, rate_max);
 441 }
 442
 443 /*
 444  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 445  * then initialized and any private data can be allocated. This also calls
 446  * startup for the cpu DAI, platform, machine and codec DAI.
 447  */
 448 static int soc_pcm_open(struct snd_pcm_substream *substream)
 449 {
 450         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 451         struct snd_pcm_runtime *runtime = substream->runtime;
 452         struct snd_soc_platform *platform = rtd->platform;
 453         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 454         struct snd_soc_dai *codec_dai;
 455         const char *codec_dai_name = "multicodec";
 456         int i, ret = 0;
 457
 458         pinctrl_pm_select_default_state(cpu_dai->dev);
 459         for (i = 0; i < rtd->num_codecs; i++)
 460                 pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
 461         pm_runtime_get_sync(cpu_dai->dev);
 462         for (i = 0; i < rtd->num_codecs; i++)
 463                 pm_runtime_get_sync(rtd->codec_dais[i]->dev);
 464         pm_runtime_get_sync(platform->dev);
 465
 466         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 467
 468         /* startup the audio subsystem */
 469         if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
 470                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 471                 if (ret < 0) {
 472                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 473                                 " %s: %d\n", cpu_dai->name, ret);
 474                         goto out;
 475                 }
 476         }
 477
 478         if (platform->driver->ops && platform->driver->ops->open) {
 479                 ret = platform->driver->ops->open(substream);
 480                 if (ret < 0) {
 481                         dev_err(platform->dev, "ASoC: can't open platform"
 482                                 " %s: %d\n", platform->component.name, ret);
 483                         goto platform_err;
 484                 }
 485         }
 486
 487         for (i = 0; i < rtd->num_codecs; i++) {
 488                 codec_dai = rtd->codec_dais[i];
 489                 if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
 490                         ret = codec_dai->driver->ops->startup(substream,
 491                                                               codec_dai);
 492                         if (ret < 0) {
 493                                 dev_err(codec_dai->dev,
 494                                         "ASoC: can't open codec %s: %d\n",
 495                                         codec_dai->name, ret);
 496                                 goto codec_dai_err;
 497                         }
 498                 }
 499
 500                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 501                         codec_dai->tx_mask = 0;
 502                 else
 503                         codec_dai->rx_mask = 0;
 504         }
 505
 506         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 507                 ret = rtd->dai_link->ops->startup(substream);
 508                 if (ret < 0) {
 509                         pr_err("ASoC: %s startup failed: %d\n",
 510                                rtd->dai_link->name, ret);
 511                         goto machine_err;
 512                 }
 513         }
 514
 515         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 516         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 517                 goto dynamic;
 518
 519         /* Check that the codec and cpu DAIs are compatible */
 520         soc_pcm_init_runtime_hw(substream);
 521
 522         if (rtd->num_codecs == 1)
 523                 codec_dai_name = rtd->codec_dai->name;
 524
 525         if (soc_pcm_has_symmetry(substream))
 526                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 527
 528         ret = -EINVAL;
 529         if (!runtime->hw.rates) {
 530                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 531                         codec_dai_name, cpu_dai->name);
 532                 goto config_err;
 533         }
 534         if (!runtime->hw.formats) {
 535                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 536                         codec_dai_name, cpu_dai->name);
 537                 goto config_err;
 538         }
 539         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 540             runtime->hw.channels_min > runtime->hw.channels_max) {
 541                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 542                                 codec_dai_name, cpu_dai->name);
 543                 goto config_err;
 544         }
 545
 546         soc_pcm_apply_msb(substream);
 547
 548         /* Symmetry only applies if we've already got an active stream. */
 549         if (cpu_dai->active) {
 550                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 551                 if (ret != 0)
 552                         goto config_err;
 553         }
 554
 555         for (i = 0; i < rtd->num_codecs; i++) {
 556                 if (rtd->codec_dais[i]->active) {
 557                         ret = soc_pcm_apply_symmetry(substream,
 558                                                      rtd->codec_dais[i]);
 559                         if (ret != 0)
 560                                 goto config_err;
 561                 }
 562         }
 563
 564         pr_debug("ASoC: %s <-> %s info:\n",
 565                         codec_dai_name, cpu_dai->name);
 566         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 567         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 568                  runtime->hw.channels_max);
 569         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 570                  runtime->hw.rate_max);
 571
 572 dynamic:
 573
 574         snd_soc_runtime_activate(rtd, substream->stream);
 575
 576         mutex_unlock(&rtd->pcm_mutex);
 577         return 0;
 578
 579 config_err:
 580         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 581                 rtd->dai_link->ops->shutdown(substream);
 582
 583 machine_err:
 584         i = rtd->num_codecs;
 585
 586 codec_dai_err:
 587         while (--i >= 0) {
 588                 codec_dai = rtd->codec_dais[i];
 589                 if (codec_dai->driver->ops->shutdown)
 590                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 591         }
 592
 593         if (platform->driver->ops && platform->driver->ops->close)
 594                 platform->driver->ops->close(substream);
 595
 596 platform_err:
 597         if (cpu_dai->driver->ops->shutdown)
 598                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 599 out:
 600         mutex_unlock(&rtd->pcm_mutex);
 601
 602         pm_runtime_mark_last_busy(platform->dev);
 603         pm_runtime_put_autosuspend(platform->dev);
 604         for (i = 0; i < rtd->num_codecs; i++) {
 605                 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
 606                 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
 607         }
 608
 609         pm_runtime_mark_last_busy(cpu_dai->dev);
 610         pm_runtime_put_autosuspend(cpu_dai->dev);
 611         for (i = 0; i < rtd->num_codecs; i++) {
 612                 if (!rtd->codec_dais[i]->active)
 613                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 614         }
 615         if (!cpu_dai->active)
 616                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 617
 618         return ret;
 619 }
 620
 621 /*
 622  * Power down the audio subsystem pmdown_time msecs after close is called.
 623  * This is to ensure there are no pops or clicks in between any music tracks
 624  * due to DAPM power cycling.
 625  */
 626 static void close_delayed_work(struct work_struct *work)
 627 {
 628         struct snd_soc_pcm_runtime *rtd =
 629                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 630         struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
 631
 632         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 633
 634         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 635                  codec_dai->driver->playback.stream_name,
 636                  codec_dai->playback_active ? "active" : "inactive",
 637                  rtd->pop_wait ? "yes" : "no");
 638
 639         /* are we waiting on this codec DAI stream */
 640         if (rtd->pop_wait == 1) {
 641                 rtd->pop_wait = 0;
 642                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 643                                           SND_SOC_DAPM_STREAM_STOP);
 644         }
 645
 646         mutex_unlock(&rtd->pcm_mutex);
 647 }
 648
 649 /*
 650  * Called by ALSA when a PCM substream is closed. Private data can be
 651  * freed here. The cpu DAI, codec DAI, machine and platform are also
 652  * shutdown.
 653  */
 654 static int soc_pcm_close(struct snd_pcm_substream *substream)
 655 {
 656         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 657         struct snd_soc_platform *platform = rtd->platform;
 658         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 659         struct snd_soc_dai *codec_dai;
 660         int i;
 661
 662         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 663
 664         snd_soc_runtime_deactivate(rtd, substream->stream);
 665
 666         /* clear the corresponding DAIs rate when inactive */
 667         if (!cpu_dai->active)
 668                 cpu_dai->rate = 0;
 669
 670         for (i = 0; i < rtd->num_codecs; i++) {
 671                 codec_dai = rtd->codec_dais[i];
 672                 if (!codec_dai->active)
 673                         codec_dai->rate = 0;
 674         }
 675
 676         snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
 677
 678         if (cpu_dai->driver->ops->shutdown)
 679                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 680
 681         for (i = 0; i < rtd->num_codecs; i++) {
 682                 codec_dai = rtd->codec_dais[i];
 683                 if (codec_dai->driver->ops->shutdown)
 684                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 685         }
 686
 687         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 688                 rtd->dai_link->ops->shutdown(substream);
 689
 690         if (platform->driver->ops && platform->driver->ops->close)
 691                 platform->driver->ops->close(substream);
 692
 693         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 694                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
 695                         /* powered down playback stream now */
 696                         snd_soc_dapm_stream_event(rtd,
 697                                                   SNDRV_PCM_STREAM_PLAYBACK,
 698                                                   SND_SOC_DAPM_STREAM_STOP);
 699                 } else {
 700                         /* start delayed pop wq here for playback streams */
 701                         rtd->pop_wait = 1;
 702                         queue_delayed_work(system_power_efficient_wq,
 703                                            &rtd->delayed_work,
 704                                            msecs_to_jiffies(rtd->pmdown_time));
 705                 }
 706         } else {
 707                 /* capture streams can be powered down now */
 708                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 709                                           SND_SOC_DAPM_STREAM_STOP);
 710         }
 711
 712         mutex_unlock(&rtd->pcm_mutex);
 713
 714         pm_runtime_mark_last_busy(platform->dev);
 715         pm_runtime_put_autosuspend(platform->dev);
 716
 717         for (i = 0; i < rtd->num_codecs; i++) {
 718                 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
 719                 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
 720         }
 721
 722         pm_runtime_mark_last_busy(cpu_dai->dev);
 723         pm_runtime_put_autosuspend(cpu_dai->dev);
 724
 725         for (i = 0; i < rtd->num_codecs; i++) {
 726                 if (!rtd->codec_dais[i]->active)
 727                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 728         }
 729         if (!cpu_dai->active)
 730                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 731
 732         return 0;
 733 }
 734
 735 /*
 736  * Called by ALSA when the PCM substream is prepared, can set format, sample
 737  * rate, etc.  This function is non atomic and can be called multiple times,
 738  * it can refer to the runtime info.
 739  */
 740 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 741 {
 742         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 743         struct snd_soc_platform *platform = rtd->platform;
 744         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 745         struct snd_soc_dai *codec_dai;
 746         int i, ret = 0;
 747
 748         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 749
 750         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 751                 ret = rtd->dai_link->ops->prepare(substream);
 752                 if (ret < 0) {
 753                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 754                                 " %d\n", ret);
 755                         goto out;
 756                 }
 757         }
 758
 759         if (platform->driver->ops && platform->driver->ops->prepare) {
 760                 ret = platform->driver->ops->prepare(substream);
 761                 if (ret < 0) {
 762                         dev_err(platform->dev, "ASoC: platform prepare error:"
 763                                 " %d\n", ret);
 764                         goto out;
 765                 }
 766         }
 767
 768         for (i = 0; i < rtd->num_codecs; i++) {
 769                 codec_dai = rtd->codec_dais[i];
 770                 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
 771                         ret = codec_dai->driver->ops->prepare(substream,
 772                                                               codec_dai);
 773                         if (ret < 0) {
 774                                 dev_err(codec_dai->dev,
 775                                         "ASoC: codec DAI prepare error: %d\n",
 776                                         ret);
 777                                 goto out;
 778                         }
 779                 }
 780         }
 781
 782         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 783                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 784                 if (ret < 0) {
 785                         dev_err(cpu_dai->dev,
 786                                 "ASoC: cpu DAI prepare error: %d\n", ret);
 787                         goto out;
 788                 }
 789         }
 790
 791         /* cancel any delayed stream shutdown that is pending */
 792         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 793             rtd->pop_wait) {
 794                 rtd->pop_wait = 0;
 795                 cancel_delayed_work(&rtd->delayed_work);
 796         }
 797
 798         snd_soc_dapm_stream_event(rtd, substream->stream,
 799                         SND_SOC_DAPM_STREAM_START);
 800
 801         for (i = 0; i < rtd->num_codecs; i++)
 802                 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
 803                                          substream->stream);
 804         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
 805
 806 out:
 807         mutex_unlock(&rtd->pcm_mutex);
 808         return ret;
 809 }
 810
 811 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 812                                        unsigned int mask)
 813 {
 814         struct snd_interval *interval;
 815         int channels = hweight_long(mask);
 816
 817         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 818         interval->min = channels;
 819         interval->max = channels;
 820 }
 821
 822 int soc_dai_hw_params(struct snd_pcm_substream *substream,
 823                       struct snd_pcm_hw_params *params,
 824                       struct snd_soc_dai *dai)
 825 {
 826         int ret;
 827
 828         if (dai->driver->ops && dai->driver->ops->hw_params) {
 829                 ret = dai->driver->ops->hw_params(substream, params, dai);
 830                 if (ret < 0) {
 831                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
 832                                 dai->name, ret);
 833                         return ret;
 834                 }
 835         }
 836
 837         return 0;
 838 }
 839
 840 /*
 841  * Called by ALSA when the hardware params are set by application. This
 842  * function can also be called multiple times and can allocate buffers
 843  * (using snd_pcm_lib_* ). It's non-atomic.
 844  */
 845 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 846                                 struct snd_pcm_hw_params *params)
 847 {
 848         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 849         struct snd_soc_platform *platform = rtd->platform;
 850         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 851         int i, ret = 0;
 852
 853         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 854
 855         ret = soc_pcm_params_symmetry(substream, params);
 856         if (ret)
 857                 goto out;
 858
 859         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 860                 ret = rtd->dai_link->ops->hw_params(substream, params);
 861                 if (ret < 0) {
 862                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 863                                 " failed: %d\n", ret);
 864                         goto out;
 865                 }
 866         }
 867
 868         for (i = 0; i < rtd->num_codecs; i++) {
 869                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 870                 struct snd_pcm_hw_params codec_params;
 871
 872                 /*
 873                  * Skip CODECs which don't support the current stream type,
 874                  * the idea being that if a CODEC is not used for the currently
 875                  * set up transfer direction, it should not need to be
 876                  * configured, especially since the configuration used might
 877                  * not even be supported by that CODEC. There may be cases
 878                  * however where a CODEC needs to be set up although it is
 879                  * actually not being used for the transfer, e.g. if a
 880                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
 881                  * for the DAI link including a playback-only CODEC.
 882                  * If this becomes necessary, we will have to augment the
 883                  * machine driver setup with information on how to act, so
 884                  * we can do the right thing here.
 885                  */
 886                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 887                         continue;
 888
 889                 /* copy params for each codec */
 890                 codec_params = *params;
 891
 892                 /* fixup params based on TDM slot masks */
 893                 if (codec_dai->tx_mask)
 894                         soc_pcm_codec_params_fixup(&codec_params,
 895                                                    codec_dai->tx_mask);
 896                 if (codec_dai->rx_mask)
 897                         soc_pcm_codec_params_fixup(&codec_params,
 898                                                    codec_dai->rx_mask);
 899
 900                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
 901                 if(ret < 0)
 902                         goto codec_err;
 903
 904                 codec_dai->rate = params_rate(&codec_params);
 905                 codec_dai->channels = params_channels(&codec_params);
 906                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 907                                                 params_format(&codec_params));
 908         }
 909
 910         ret = soc_dai_hw_params(substream, params, cpu_dai);
 911         if (ret < 0)
 912                 goto interface_err;
 913
 914         if (platform->driver->ops && platform->driver->ops->hw_params) {
 915                 ret = platform->driver->ops->hw_params(substream, params);
 916                 if (ret < 0) {
 917                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 918                                platform->component.name, ret);
 919                         goto platform_err;
 920                 }
 921         }
 922
 923         /* store the parameters for each DAIs */
 924         cpu_dai->rate = params_rate(params);
 925         cpu_dai->channels = params_channels(params);
 926         cpu_dai->sample_bits =
 927                 snd_pcm_format_physical_width(params_format(params));
 928
 929 out:
 930         mutex_unlock(&rtd->pcm_mutex);
 931         return ret;
 932
 933 platform_err:
 934         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 935                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 936
 937 interface_err:
 938         i = rtd->num_codecs;
 939
 940 codec_err:
 941         while (--i >= 0) {
 942                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 943                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 944                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 945                 codec_dai->rate = 0;
 946         }
 947
 948         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 949                 rtd->dai_link->ops->hw_free(substream);
 950
 951         mutex_unlock(&rtd->pcm_mutex);
 952         return ret;
 953 }
 954
 955 /*
 956  * Frees resources allocated by hw_params, can be called multiple times
 957  */
 958 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 959 {
 960         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 961         struct snd_soc_platform *platform = rtd->platform;
 962         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 963         struct snd_soc_dai *codec_dai;
 964         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 965         int i;
 966
 967         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 968
 969         /* clear the corresponding DAIs parameters when going to be inactive */
 970         if (cpu_dai->active == 1) {
 971                 cpu_dai->rate = 0;
 972                 cpu_dai->channels = 0;
 973                 cpu_dai->sample_bits = 0;
 974         }
 975
 976         for (i = 0; i < rtd->num_codecs; i++) {
 977                 codec_dai = rtd->codec_dais[i];
 978                 if (codec_dai->active == 1) {
 979                         codec_dai->rate = 0;
 980                         codec_dai->channels = 0;
 981                         codec_dai->sample_bits = 0;
 982                 }
 983         }
 984
 985         /* apply codec digital mute */
 986         for (i = 0; i < rtd->num_codecs; i++) {
 987                 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
 988                     (!playback && rtd->codec_dais[i]->capture_active == 1))
 989                         snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
 990                                                  substream->stream);
 991         }
 992
 993         /* free any machine hw params */
 994         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 995                 rtd->dai_link->ops->hw_free(substream);
 996
 997         /* free any DMA resources */
 998         if (platform->driver->ops && platform->driver->ops->hw_free)
 999                 platform->driver->ops->hw_free(substream);
1000
1001         /* now free hw params for the DAIs  */
1002         for (i = 0; i < rtd->num_codecs; i++) {
1003                 codec_dai = rtd->codec_dais[i];
1004                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
1005                         codec_dai->driver->ops->hw_free(substream, codec_dai);
1006         }
1007
1008         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
1009                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
1010
1011         mutex_unlock(&rtd->pcm_mutex);
1012         return 0;
1013 }
1014
1015 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1016 {
1017         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1018         struct snd_soc_platform *platform = rtd->platform;
1019         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1020         struct snd_soc_dai *codec_dai;
1021         int i, ret;
1022
1023         for (i = 0; i < rtd->num_codecs; i++) {
1024                 codec_dai = rtd->codec_dais[i];
1025                 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
1026                         ret = codec_dai->driver->ops->trigger(substream,
1027                                                               cmd, codec_dai);
1028                         if (ret < 0)
1029                                 return ret;
1030                 }
1031         }
1032
1033         if (platform->driver->ops && platform->driver->ops->trigger) {
1034                 ret = platform->driver->ops->trigger(substream, cmd);
1035                 if (ret < 0)
1036                         return ret;
1037         }
1038
1039         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
1040                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
1041                 if (ret < 0)
1042                         return ret;
1043         }
1044
1045         if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1046                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1047                 if (ret < 0)
1048                         return ret;
1049         }
1050
1051         return 0;
1052 }
1053
1054 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1055                                    int cmd)
1056 {
1057         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1058         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1059         struct snd_soc_dai *codec_dai;
1060         int i, ret;
1061
1062         for (i = 0; i < rtd->num_codecs; i++) {
1063                 codec_dai = rtd->codec_dais[i];
1064                 if (codec_dai->driver->ops &&
1065                     codec_dai->driver->ops->bespoke_trigger) {
1066                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1067                                                                 cmd, codec_dai);
1068                         if (ret < 0)
1069                                 return ret;
1070                 }
1071         }
1072
1073         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1074                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1075                 if (ret < 0)
1076                         return ret;
1077         }
1078         return 0;
1079 }
1080 /*
1081  * soc level wrapper for pointer callback
1082  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1083  * the runtime->delay will be updated accordingly.
1084  */
1085 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1086 {
1087         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1088         struct snd_soc_platform *platform = rtd->platform;
1089         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1090         struct snd_soc_dai *codec_dai;
1091         struct snd_pcm_runtime *runtime = substream->runtime;
1092         snd_pcm_uframes_t offset = 0;
1093         snd_pcm_sframes_t delay = 0;
1094         snd_pcm_sframes_t codec_delay = 0;
1095         int i;
1096
1097         if (platform->driver->ops && platform->driver->ops->pointer)
1098                 offset = platform->driver->ops->pointer(substream);
1099
1100         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1101                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1102
1103         for (i = 0; i < rtd->num_codecs; i++) {
1104                 codec_dai = rtd->codec_dais[i];
1105                 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1106                         codec_delay = max(codec_delay,
1107                                         codec_dai->driver->ops->delay(substream,
1108                                                                     codec_dai));
1109         }
1110         delay += codec_delay;
1111
1112         runtime->delay = delay;
1113
1114         return offset;
1115 }
1116
1117 /* connect a FE and BE */
1118 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1119                 struct snd_soc_pcm_runtime *be, int stream)
1120 {
1121         struct snd_soc_dpcm *dpcm;
1122
1123         /* only add new dpcms */
1124         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1125                 if (dpcm->be == be && dpcm->fe == fe)
1126                         return 0;
1127         }
1128
1129         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1130         if (!dpcm)
1131                 return -ENOMEM;
1132
1133         dpcm->be = be;
1134         dpcm->fe = fe;
1135         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1136         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1137         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1138         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1139
1140         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1141                         stream ? "capture" : "playback",  fe->dai_link->name,
1142                         stream ? "<-" : "->", be->dai_link->name);
1143
1144 #ifdef CONFIG_DEBUG_FS
1145         if (fe->debugfs_dpcm_root)
1146                 dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1147                                 fe->debugfs_dpcm_root, &dpcm->state);
1148 #endif
1149         return 1;
1150 }
1151
1152 /* reparent a BE onto another FE */
1153 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1154                         struct snd_soc_pcm_runtime *be, int stream)
1155 {
1156         struct snd_soc_dpcm *dpcm;
1157         struct snd_pcm_substream *fe_substream, *be_substream;
1158
1159         /* reparent if BE is connected to other FEs */
1160         if (!be->dpcm[stream].users)
1161                 return;
1162
1163         be_substream = snd_soc_dpcm_get_substream(be, stream);
1164
1165         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1166                 if (dpcm->fe == fe)
1167                         continue;
1168
1169                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1170                         stream ? "capture" : "playback",
1171                         dpcm->fe->dai_link->name,
1172                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1173
1174                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1175                 be_substream->runtime = fe_substream->runtime;
1176                 break;
1177         }
1178 }
1179
1180 /* disconnect a BE and FE */
1181 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1182 {
1183         struct snd_soc_dpcm *dpcm, *d;
1184
1185         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1186                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1187                                 stream ? "capture" : "playback",
1188                                 dpcm->be->dai_link->name);
1189
1190                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1191                         continue;
1192
1193                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1194                         stream ? "capture" : "playback", fe->dai_link->name,
1195                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1196
1197                 /* BEs still alive need new FE */
1198                 dpcm_be_reparent(fe, dpcm->be, stream);
1199
1200 #ifdef CONFIG_DEBUG_FS
1201                 debugfs_remove(dpcm->debugfs_state);
1202 #endif
1203                 list_del(&dpcm->list_be);
1204                 list_del(&dpcm->list_fe);
1205                 kfree(dpcm);
1206         }
1207 }
1208
1209 /* get BE for DAI widget and stream */
1210 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1211                 struct snd_soc_dapm_widget *widget, int stream)
1212 {
1213         struct snd_soc_pcm_runtime *be;
1214         int i;
1215
1216         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1217                 list_for_each_entry(be, &card->rtd_list, list) {
1218
1219                         if (!be->dai_link->no_pcm)
1220                                 continue;
1221
1222                         if (be->cpu_dai->playback_widget == widget)
1223                                 return be;
1224
1225                         for (i = 0; i < be->num_codecs; i++) {
1226                                 struct snd_soc_dai *dai = be->codec_dais[i];
1227                                 if (dai->playback_widget == widget)
1228                                         return be;
1229                         }
1230                 }
1231         } else {
1232
1233                 list_for_each_entry(be, &card->rtd_list, list) {
1234
1235                         if (!be->dai_link->no_pcm)
1236                                 continue;
1237
1238                         if (be->cpu_dai->capture_widget == widget)
1239                                 return be;
1240
1241                         for (i = 0; i < be->num_codecs; i++) {
1242                                 struct snd_soc_dai *dai = be->codec_dais[i];
1243                                 if (dai->capture_widget == widget)
1244                                         return be;
1245                         }
1246                 }
1247         }
1248
1249         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1250                 stream ? "capture" : "playback", widget->name);
1251         return NULL;
1252 }
1253
1254 static inline struct snd_soc_dapm_widget *
1255         dai_get_widget(struct snd_soc_dai *dai, int stream)
1256 {
1257         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1258                 return dai->playback_widget;
1259         else
1260                 return dai->capture_widget;
1261 }
1262
1263 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1264                 struct snd_soc_dapm_widget *widget)
1265 {
1266         int i;
1267
1268         for (i = 0; i < list->num_widgets; i++) {
1269                 if (widget == list->widgets[i])
1270                         return 1;
1271         }
1272
1273         return 0;
1274 }
1275
1276 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1277                 enum snd_soc_dapm_direction dir)
1278 {
1279         struct snd_soc_card *card = widget->dapm->card;
1280         struct snd_soc_pcm_runtime *rtd;
1281         int i;
1282
1283         if (dir == SND_SOC_DAPM_DIR_OUT) {
1284                 list_for_each_entry(rtd, &card->rtd_list, list) {
1285                         if (!rtd->dai_link->no_pcm)
1286                                 continue;
1287
1288                         if (rtd->cpu_dai->playback_widget == widget)
1289                                 return true;
1290
1291                         for (i = 0; i < rtd->num_codecs; ++i) {
1292                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1293                                 if (dai->playback_widget == widget)
1294                                         return true;
1295                         }
1296                 }
1297         } else { /* SND_SOC_DAPM_DIR_IN */
1298                 list_for_each_entry(rtd, &card->rtd_list, list) {
1299                         if (!rtd->dai_link->no_pcm)
1300                                 continue;
1301
1302                         if (rtd->cpu_dai->capture_widget == widget)
1303                                 return true;
1304
1305                         for (i = 0; i < rtd->num_codecs; ++i) {
1306                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1307                                 if (dai->capture_widget == widget)
1308                                         return true;
1309                         }
1310                 }
1311         }
1312
1313         return false;
1314 }
1315
1316 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1317         int stream, struct snd_soc_dapm_widget_list **list)
1318 {
1319         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1320         int paths;
1321
1322         /* get number of valid DAI paths and their widgets */
1323         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1324                         dpcm_end_walk_at_be);
1325
1326         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1327                         stream ? "capture" : "playback");
1328
1329         return paths;
1330 }
1331
1332 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1333         struct snd_soc_dapm_widget_list **list_)
1334 {
1335         struct snd_soc_dpcm *dpcm;
1336         struct snd_soc_dapm_widget_list *list = *list_;
1337         struct snd_soc_dapm_widget *widget;
1338         int prune = 0;
1339
1340         /* Destroy any old FE <--> BE connections */
1341         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1342                 unsigned int i;
1343
1344                 /* is there a valid CPU DAI widget for this BE */
1345                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1346
1347                 /* prune the BE if it's no longer in our active list */
1348                 if (widget && widget_in_list(list, widget))
1349                         continue;
1350
1351                 /* is there a valid CODEC DAI widget for this BE */
1352                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1353                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1354                         widget = dai_get_widget(dai, stream);
1355
1356                         /* prune the BE if it's no longer in our active list */
1357                         if (widget && widget_in_list(list, widget))
1358                                 continue;
1359                 }
1360
1361                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1362                         stream ? "capture" : "playback",
1363                         dpcm->be->dai_link->name, fe->dai_link->name);
1364                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1365                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1366                 prune++;
1367         }
1368
1369         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1370         return prune;
1371 }
1372
1373 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1374         struct snd_soc_dapm_widget_list **list_)
1375 {
1376         struct snd_soc_card *card = fe->card;
1377         struct snd_soc_dapm_widget_list *list = *list_;
1378         struct snd_soc_pcm_runtime *be;
1379         int i, new = 0, err;
1380
1381         /* Create any new FE <--> BE connections */
1382         for (i = 0; i < list->num_widgets; i++) {
1383
1384                 switch (list->widgets[i]->id) {
1385                 case snd_soc_dapm_dai_in:
1386                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1387                                 continue;
1388                         break;
1389                 case snd_soc_dapm_dai_out:
1390                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1391                                 continue;
1392                         break;
1393                 default:
1394                         continue;
1395                 }
1396
1397                 /* is there a valid BE rtd for this widget */
1398                 be = dpcm_get_be(card, list->widgets[i], stream);
1399                 if (!be) {
1400                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1401                                         list->widgets[i]->name);
1402                         continue;
1403                 }
1404
1405                 /* make sure BE is a real BE */
1406                 if (!be->dai_link->no_pcm)
1407                         continue;
1408
1409                 /* don't connect if FE is not running */
1410                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1411                         continue;
1412
1413                 /* newly connected FE and BE */
1414                 err = dpcm_be_connect(fe, be, stream);
1415                 if (err < 0) {
1416                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1417                                 list->widgets[i]->name);
1418                         break;
1419                 } else if (err == 0) /* already connected */
1420                         continue;
1421
1422                 /* new */
1423                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1424                 new++;
1425         }
1426
1427         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1428         return new;
1429 }
1430
1431 /*
1432  * Find the corresponding BE DAIs that source or sink audio to this
1433  * FE substream.
1434  */
1435 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1436         int stream, struct snd_soc_dapm_widget_list **list, int new)
1437 {
1438         if (new)
1439                 return dpcm_add_paths(fe, stream, list);
1440         else
1441                 return dpcm_prune_paths(fe, stream, list);
1442 }
1443
1444 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1445 {
1446         struct snd_soc_dpcm *dpcm;
1447
1448         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1449                 dpcm->be->dpcm[stream].runtime_update =
1450                                                 SND_SOC_DPCM_UPDATE_NO;
1451 }
1452
1453 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1454         int stream)
1455 {
1456         struct snd_soc_dpcm *dpcm;
1457
1458         /* disable any enabled and non active backends */
1459         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1460
1461                 struct snd_soc_pcm_runtime *be = dpcm->be;
1462                 struct snd_pcm_substream *be_substream =
1463                         snd_soc_dpcm_get_substream(be, stream);
1464
1465                 if (be->dpcm[stream].users == 0)
1466                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1467                                 stream ? "capture" : "playback",
1468                                 be->dpcm[stream].state);
1469
1470                 if (--be->dpcm[stream].users != 0)
1471                         continue;
1472
1473                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1474                         continue;
1475
1476                 soc_pcm_close(be_substream);
1477                 be_substream->runtime = NULL;
1478                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1479         }
1480 }
1481
1482 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1483 {
1484         struct snd_soc_dpcm *dpcm;
1485         int err, count = 0;
1486
1487         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1488         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1489
1490                 struct snd_soc_pcm_runtime *be = dpcm->be;
1491                 struct snd_pcm_substream *be_substream =
1492                         snd_soc_dpcm_get_substream(be, stream);
1493
1494                 if (!be_substream) {
1495                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1496                                 stream ? "capture" : "playback");
1497                         continue;
1498                 }
1499
1500                 /* is this op for this BE ? */
1501                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1502                         continue;
1503
1504                 /* first time the dpcm is open ? */
1505                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1506                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1507                                 stream ? "capture" : "playback",
1508                                 be->dpcm[stream].state);
1509
1510                 if (be->dpcm[stream].users++ != 0)
1511                         continue;
1512
1513                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1514                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1515                         continue;
1516
1517                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1518                         stream ? "capture" : "playback", be->dai_link->name);
1519
1520                 be_substream->runtime = be->dpcm[stream].runtime;
1521                 err = soc_pcm_open(be_substream);
1522                 if (err < 0) {
1523                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1524                         be->dpcm[stream].users--;
1525                         if (be->dpcm[stream].users < 0)
1526                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1527                                         stream ? "capture" : "playback",
1528                                         be->dpcm[stream].state);
1529
1530                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1531                         goto unwind;
1532                 }
1533
1534                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1535                 count++;
1536         }
1537
1538         return count;
1539
1540 unwind:
1541         /* disable any enabled and non active backends */
1542         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1543                 struct snd_soc_pcm_runtime *be = dpcm->be;
1544                 struct snd_pcm_substream *be_substream =
1545                         snd_soc_dpcm_get_substream(be, stream);
1546
1547                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1548                         continue;
1549
1550                 if (be->dpcm[stream].users == 0)
1551                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1552                                 stream ? "capture" : "playback",
1553                                 be->dpcm[stream].state);
1554
1555                 if (--be->dpcm[stream].users != 0)
1556                         continue;
1557
1558                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1559                         continue;
1560
1561                 soc_pcm_close(be_substream);
1562                 be_substream->runtime = NULL;
1563                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1564         }
1565
1566         return err;
1567 }
1568
1569 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1570                                  struct snd_soc_pcm_stream *stream,
1571                                  u64 formats)
1572 {
1573         runtime->hw.rate_min = stream->rate_min;
1574         runtime->hw.rate_max = stream->rate_max;
1575         runtime->hw.channels_min = stream->channels_min;
1576         runtime->hw.channels_max = stream->channels_max;
1577         if (runtime->hw.formats)
1578                 runtime->hw.formats &= formats & stream->formats;
1579         else
1580                 runtime->hw.formats = formats & stream->formats;
1581         runtime->hw.rates = stream->rates;
1582 }
1583
1584 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1585 {
1586         struct snd_soc_pcm_runtime *fe = substream->private_data;
1587         struct snd_soc_dpcm *dpcm;
1588         u64 formats = ULLONG_MAX;
1589         int stream = substream->stream;
1590
1591         if (!fe->dai_link->dpcm_merged_format)
1592                 return formats;
1593
1594         /*
1595          * It returns merged BE codec format
1596          * if FE want to use it (= dpcm_merged_format)
1597          */
1598
1599         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1600                 struct snd_soc_pcm_runtime *be = dpcm->be;
1601                 struct snd_soc_dai_driver *codec_dai_drv;
1602                 struct snd_soc_pcm_stream *codec_stream;
1603                 int i;
1604
1605                 for (i = 0; i < be->num_codecs; i++) {
1606                         codec_dai_drv = be->codec_dais[i]->driver;
1607                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1608                                 codec_stream = &codec_dai_drv->playback;
1609                         else
1610                                 codec_stream = &codec_dai_drv->capture;
1611
1612                         formats &= codec_stream->formats;
1613                 }
1614         }
1615
1616         return formats;
1617 }
1618
1619 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1620 {
1621         struct snd_pcm_runtime *runtime = substream->runtime;
1622         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1623         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1624         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1625         u64 format = dpcm_runtime_base_format(substream);
1626
1627         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1628                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1629         else
1630                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1631 }
1632
1633 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1634
1635 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1636  * for avoiding the race with trigger callback.
1637  * If the state is unset and a trigger is pending while the previous operation,
1638  * process the pending trigger action here.
1639  */
1640 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1641                                      int stream, enum snd_soc_dpcm_update state)
1642 {
1643         struct snd_pcm_substream *substream =
1644                 snd_soc_dpcm_get_substream(fe, stream);
1645
1646         snd_pcm_stream_lock_irq(substream);
1647         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1648                 dpcm_fe_dai_do_trigger(substream,
1649                                        fe->dpcm[stream].trigger_pending - 1);
1650                 fe->dpcm[stream].trigger_pending = 0;
1651         }
1652         fe->dpcm[stream].runtime_update = state;
1653         snd_pcm_stream_unlock_irq(substream);
1654 }
1655
1656 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1657                                int stream)
1658 {
1659         struct snd_soc_dpcm *dpcm;
1660         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1661         struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1662         int err;
1663
1664         /* apply symmetry for FE */
1665         if (soc_pcm_has_symmetry(fe_substream))
1666                 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1667
1668         /* Symmetry only applies if we've got an active stream. */
1669         if (fe_cpu_dai->active) {
1670                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1671                 if (err < 0)
1672                         return err;
1673         }
1674
1675         /* apply symmetry for BE */
1676         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1677                 struct snd_soc_pcm_runtime *be = dpcm->be;
1678                 struct snd_pcm_substream *be_substream =
1679                         snd_soc_dpcm_get_substream(be, stream);
1680                 struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
1681                 int i;
1682
1683                 if (rtd->dai_link->be_hw_params_fixup)
1684                         continue;
1685
1686                 if (soc_pcm_has_symmetry(be_substream))
1687                         be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1688
1689                 /* Symmetry only applies if we've got an active stream. */
1690                 if (rtd->cpu_dai->active) {
1691                         err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
1692                         if (err < 0)
1693                                 return err;
1694                 }
1695
1696                 for (i = 0; i < rtd->num_codecs; i++) {
1697                         if (rtd->codec_dais[i]->active) {
1698                                 err = soc_pcm_apply_symmetry(be_substream,
1699                                                              rtd->codec_dais[i]);
1700                                 if (err < 0)
1701                                         return err;
1702                         }
1703                 }
1704         }
1705
1706         return 0;
1707 }
1708
1709 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1710 {
1711         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1712         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1713         int stream = fe_substream->stream, ret = 0;
1714
1715         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1716
1717         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1718         if (ret < 0) {
1719                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1720                 goto be_err;
1721         }
1722
1723         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1724
1725         /* start the DAI frontend */
1726         ret = soc_pcm_open(fe_substream);
1727         if (ret < 0) {
1728                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1729                 goto unwind;
1730         }
1731
1732         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1733
1734         dpcm_set_fe_runtime(fe_substream);
1735         snd_pcm_limit_hw_rates(runtime);
1736
1737         ret = dpcm_apply_symmetry(fe_substream, stream);
1738         if (ret < 0) {
1739                 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1740                         ret);
1741                 goto unwind;
1742         }
1743
1744         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1745         return 0;
1746
1747 unwind:
1748         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1749 be_err:
1750         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1751         return ret;
1752 }
1753
1754 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1755 {
1756         struct snd_soc_dpcm *dpcm;
1757
1758         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1759         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1760
1761                 struct snd_soc_pcm_runtime *be = dpcm->be;
1762                 struct snd_pcm_substream *be_substream =
1763                         snd_soc_dpcm_get_substream(be, stream);
1764
1765                 /* is this op for this BE ? */
1766                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1767                         continue;
1768
1769                 if (be->dpcm[stream].users == 0)
1770                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1771                                 stream ? "capture" : "playback",
1772                                 be->dpcm[stream].state);
1773
1774                 if (--be->dpcm[stream].users != 0)
1775                         continue;
1776
1777                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1778                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1779                         continue;
1780
1781                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1782                         be->dai_link->name);
1783
1784                 soc_pcm_close(be_substream);
1785                 be_substream->runtime = NULL;
1786
1787                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1788         }
1789         return 0;
1790 }
1791
1792 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1793 {
1794         struct snd_soc_pcm_runtime *fe = substream->private_data;
1795         int stream = substream->stream;
1796
1797         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1798
1799         /* shutdown the BEs */
1800         dpcm_be_dai_shutdown(fe, substream->stream);
1801
1802         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1803
1804         /* now shutdown the frontend */
1805         soc_pcm_close(substream);
1806
1807         /* run the stream event for each BE */
1808         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1809
1810         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1811         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1812         return 0;
1813 }
1814
1815 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1816 {
1817         struct snd_soc_dpcm *dpcm;
1818
1819         /* only hw_params backends that are either sinks or sources
1820          * to this frontend DAI */
1821         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1822
1823                 struct snd_soc_pcm_runtime *be = dpcm->be;
1824                 struct snd_pcm_substream *be_substream =
1825                         snd_soc_dpcm_get_substream(be, stream);
1826
1827                 /* is this op for this BE ? */
1828                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1829                         continue;
1830
1831                 /* only free hw when no longer used - check all FEs */
1832                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1833                                 continue;
1834
1835                 /* do not free hw if this BE is used by other FE */
1836                 if (be->dpcm[stream].users > 1)
1837                         continue;
1838
1839                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1840                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1841                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1842                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1843                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1844                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1845                         continue;
1846
1847                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1848                         be->dai_link->name);
1849
1850                 soc_pcm_hw_free(be_substream);
1851
1852                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1853         }
1854
1855         return 0;
1856 }
1857
1858 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1859 {
1860         struct snd_soc_pcm_runtime *fe = substream->private_data;
1861         int err, stream = substream->stream;
1862
1863         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1864         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1865
1866         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1867
1868         /* call hw_free on the frontend */
1869         err = soc_pcm_hw_free(substream);
1870         if (err < 0)
1871                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1872                         fe->dai_link->name);
1873
1874         /* only hw_params backends that are either sinks or sources
1875          * to this frontend DAI */
1876         err = dpcm_be_dai_hw_free(fe, stream);
1877
1878         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1879         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1880
1881         mutex_unlock(&fe->card->mutex);
1882         return 0;
1883 }
1884
1885 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1886 {
1887         struct snd_soc_dpcm *dpcm;
1888         int ret;
1889
1890         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1891
1892                 struct snd_soc_pcm_runtime *be = dpcm->be;
1893                 struct snd_pcm_substream *be_substream =
1894                         snd_soc_dpcm_get_substream(be, stream);
1895
1896                 /* is this op for this BE ? */
1897                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1898                         continue;
1899
1900                 /* copy params for each dpcm */
1901                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1902                                 sizeof(struct snd_pcm_hw_params));
1903
1904                 /* perform any hw_params fixups */
1905                 if (be->dai_link->be_hw_params_fixup) {
1906                         ret = be->dai_link->be_hw_params_fixup(be,
1907                                         &dpcm->hw_params);
1908                         if (ret < 0) {
1909                                 dev_err(be->dev,
1910                                         "ASoC: hw_params BE fixup failed %d\n",
1911                                         ret);
1912                                 goto unwind;
1913                         }
1914                 }
1915
1916                 /* only allow hw_params() if no connected FEs are running */
1917                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1918                         continue;
1919
1920                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1921                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1922                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1923                         continue;
1924
1925                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1926                         be->dai_link->name);
1927
1928                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1929                 if (ret < 0) {
1930                         dev_err(dpcm->be->dev,
1931                                 "ASoC: hw_params BE failed %d\n", ret);
1932                         goto unwind;
1933                 }
1934
1935                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1936         }
1937         return 0;
1938
1939 unwind:
1940         /* disable any enabled and non active backends */
1941         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1942                 struct snd_soc_pcm_runtime *be = dpcm->be;
1943                 struct snd_pcm_substream *be_substream =
1944                         snd_soc_dpcm_get_substream(be, stream);
1945
1946                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1947                         continue;
1948
1949                 /* only allow hw_free() if no connected FEs are running */
1950                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1951                         continue;
1952
1953                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1954                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1955                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1956                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1957                         continue;
1958
1959                 soc_pcm_hw_free(be_substream);
1960         }
1961
1962         return ret;
1963 }
1964
1965 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1966                                  struct snd_pcm_hw_params *params)
1967 {
1968         struct snd_soc_pcm_runtime *fe = substream->private_data;
1969         int ret, stream = substream->stream;
1970
1971         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1972         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1973
1974         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1975                         sizeof(struct snd_pcm_hw_params));
1976         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1977         if (ret < 0) {
1978                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1979                 goto out;
1980         }
1981
1982         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1983                         fe->dai_link->name, params_rate(params),
1984                         params_channels(params), params_format(params));
1985
1986         /* call hw_params on the frontend */
1987         ret = soc_pcm_hw_params(substream, params);
1988         if (ret < 0) {
1989                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1990                 dpcm_be_dai_hw_free(fe, stream);
1991          } else
1992                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1993
1994 out:
1995         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1996         mutex_unlock(&fe->card->mutex);
1997         return ret;
1998 }
1999
2000 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2001                 struct snd_pcm_substream *substream, int cmd)
2002 {
2003         int ret;
2004
2005         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2006                         dpcm->be->dai_link->name, cmd);
2007
2008         ret = soc_pcm_trigger(substream, cmd);
2009         if (ret < 0)
2010                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2011
2012         return ret;
2013 }
2014
2015 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2016                                int cmd)
2017 {
2018         struct snd_soc_dpcm *dpcm;
2019         int ret = 0;
2020
2021         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2022
2023                 struct snd_soc_pcm_runtime *be = dpcm->be;
2024                 struct snd_pcm_substream *be_substream =
2025                         snd_soc_dpcm_get_substream(be, stream);
2026
2027                 /* is this op for this BE ? */
2028                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2029                         continue;
2030
2031                 switch (cmd) {
2032                 case SNDRV_PCM_TRIGGER_START:
2033                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2034                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2035                                 continue;
2036
2037                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2038                         if (ret)
2039                                 return ret;
2040
2041                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2042                         break;
2043                 case SNDRV_PCM_TRIGGER_RESUME:
2044                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2045                                 continue;
2046
2047                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2048                         if (ret)
2049                                 return ret;
2050
2051                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2052                         break;
2053                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2054                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2055                                 continue;
2056
2057                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2058                         if (ret)
2059                                 return ret;
2060
2061                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2062                         break;
2063                 case SNDRV_PCM_TRIGGER_STOP:
2064                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2065                                 continue;
2066
2067                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2068                                 continue;
2069
2070                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2071                         if (ret)
2072                                 return ret;
2073
2074                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2075                         break;
2076                 case SNDRV_PCM_TRIGGER_SUSPEND:
2077                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2078                                 continue;
2079
2080                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2081                                 continue;
2082
2083                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2084                         if (ret)
2085                                 return ret;
2086
2087                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2088                         break;
2089                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2090                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2091                                 continue;
2092
2093                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2094                                 continue;
2095
2096                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2097                         if (ret)
2098                                 return ret;
2099
2100                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2101                         break;
2102                 }
2103         }
2104
2105         return ret;
2106 }
2107 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2108
2109 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2110 {
2111         struct snd_soc_pcm_runtime *fe = substream->private_data;
2112         int stream = substream->stream, ret;
2113         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2114
2115         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2116
2117         switch (trigger) {
2118         case SND_SOC_DPCM_TRIGGER_PRE:
2119                 /* call trigger on the frontend before the backend. */
2120
2121                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2122                                 fe->dai_link->name, cmd);
2123
2124                 ret = soc_pcm_trigger(substream, cmd);
2125                 if (ret < 0) {
2126                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2127                         goto out;
2128                 }
2129
2130                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2131                 break;
2132         case SND_SOC_DPCM_TRIGGER_POST:
2133                 /* call trigger on the frontend after the backend. */
2134
2135                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2136                 if (ret < 0) {
2137                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2138                         goto out;
2139                 }
2140
2141                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2142                                 fe->dai_link->name, cmd);
2143
2144                 ret = soc_pcm_trigger(substream, cmd);
2145                 break;
2146         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2147                 /* bespoke trigger() - handles both FE and BEs */
2148
2149                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2150                                 fe->dai_link->name, cmd);
2151
2152                 ret = soc_pcm_bespoke_trigger(substream, cmd);
2153                 if (ret < 0) {
2154                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2155                         goto out;
2156                 }
2157                 break;
2158         default:
2159                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2160                                 fe->dai_link->name);
2161                 ret = -EINVAL;
2162                 goto out;
2163         }
2164
2165         switch (cmd) {
2166         case SNDRV_PCM_TRIGGER_START:
2167         case SNDRV_PCM_TRIGGER_RESUME:
2168         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2169                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2170                 break;
2171         case SNDRV_PCM_TRIGGER_STOP:
2172         case SNDRV_PCM_TRIGGER_SUSPEND:
2173                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2174                 break;
2175         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2176                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2177                 break;
2178         }
2179
2180 out:
2181         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2182         return ret;
2183 }
2184
2185 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2186 {
2187         struct snd_soc_pcm_runtime *fe = substream->private_data;
2188         int stream = substream->stream;
2189
2190         /* if FE's runtime_update is already set, we're in race;
2191          * process this trigger later at exit
2192          */
2193         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2194                 fe->dpcm[stream].trigger_pending = cmd + 1;
2195                 return 0; /* delayed, assuming it's successful */
2196         }
2197
2198         /* we're alone, let's trigger */
2199         return dpcm_fe_dai_do_trigger(substream, cmd);
2200 }
2201
2202 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2203 {
2204         struct snd_soc_dpcm *dpcm;
2205         int ret = 0;
2206
2207         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2208
2209                 struct snd_soc_pcm_runtime *be = dpcm->be;
2210                 struct snd_pcm_substream *be_substream =
2211                         snd_soc_dpcm_get_substream(be, stream);
2212
2213                 /* is this op for this BE ? */
2214                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2215                         continue;
2216
2217                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2218                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2219                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2220                         continue;
2221
2222                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2223                         be->dai_link->name);
2224
2225                 ret = soc_pcm_prepare(be_substream);
2226                 if (ret < 0) {
2227                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2228                                 ret);
2229                         break;
2230                 }
2231
2232                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2233         }
2234         return ret;
2235 }
2236
2237 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2238 {
2239         struct snd_soc_pcm_runtime *fe = substream->private_data;
2240         int stream = substream->stream, ret = 0;
2241
2242         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2243
2244         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2245
2246         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2247
2248         /* there is no point preparing this FE if there are no BEs */
2249         if (list_empty(&fe->dpcm[stream].be_clients)) {
2250                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2251                                 fe->dai_link->name);
2252                 ret = -EINVAL;
2253                 goto out;
2254         }
2255
2256         ret = dpcm_be_dai_prepare(fe, substream->stream);
2257         if (ret < 0)
2258                 goto out;
2259
2260         /* call prepare on the frontend */
2261         ret = soc_pcm_prepare(substream);
2262         if (ret < 0) {
2263                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2264                         fe->dai_link->name);
2265                 goto out;
2266         }
2267
2268         /* run the stream event for each BE */
2269         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2270         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2271
2272 out:
2273         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2274         mutex_unlock(&fe->card->mutex);
2275
2276         return ret;
2277 }
2278
2279 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2280                      unsigned int cmd, void *arg)
2281 {
2282         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2283         struct snd_soc_platform *platform = rtd->platform;
2284
2285         if (platform->driver->ops && platform->driver->ops->ioctl)
2286                 return platform->driver->ops->ioctl(substream, cmd, arg);
2287         return snd_pcm_lib_ioctl(substream, cmd, arg);
2288 }
2289
2290 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2291 {
2292         struct snd_pcm_substream *substream =
2293                 snd_soc_dpcm_get_substream(fe, stream);
2294         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2295         int err;
2296
2297         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2298                         stream ? "capture" : "playback", fe->dai_link->name);
2299
2300         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2301                 /* call bespoke trigger - FE takes care of all BE triggers */
2302                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2303                                 fe->dai_link->name);
2304
2305                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2306                 if (err < 0)
2307                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2308         } else {
2309                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2310                         fe->dai_link->name);
2311
2312                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2313                 if (err < 0)
2314                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2315         }
2316
2317         err = dpcm_be_dai_hw_free(fe, stream);
2318         if (err < 0)
2319                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2320
2321         err = dpcm_be_dai_shutdown(fe, stream);
2322         if (err < 0)
2323                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2324
2325         /* run the stream event for each BE */
2326         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2327
2328         return 0;
2329 }
2330
2331 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2332 {
2333         struct snd_pcm_substream *substream =
2334                 snd_soc_dpcm_get_substream(fe, stream);
2335         struct snd_soc_dpcm *dpcm;
2336         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2337         int ret;
2338
2339         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2340                         stream ? "capture" : "playback", fe->dai_link->name);
2341
2342         /* Only start the BE if the FE is ready */
2343         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2344                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2345                 return -EINVAL;
2346
2347         /* startup must always be called for new BEs */
2348         ret = dpcm_be_dai_startup(fe, stream);
2349         if (ret < 0)
2350                 goto disconnect;
2351
2352         /* keep going if FE state is > open */
2353         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2354                 return 0;
2355
2356         ret = dpcm_be_dai_hw_params(fe, stream);
2357         if (ret < 0)
2358                 goto close;
2359
2360         /* keep going if FE state is > hw_params */
2361         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2362                 return 0;
2363
2364
2365         ret = dpcm_be_dai_prepare(fe, stream);
2366         if (ret < 0)
2367                 goto hw_free;
2368
2369         /* run the stream event for each BE */
2370         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2371
2372         /* keep going if FE state is > prepare */
2373         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2374                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2375                 return 0;
2376
2377         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2378                 /* call trigger on the frontend - FE takes care of all BE triggers */
2379                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2380                                 fe->dai_link->name);
2381
2382                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2383                 if (ret < 0) {
2384                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2385                         goto hw_free;
2386                 }
2387         } else {
2388                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2389                         fe->dai_link->name);
2390
2391                 ret = dpcm_be_dai_trigger(fe, stream,
2392                                         SNDRV_PCM_TRIGGER_START);
2393                 if (ret < 0) {
2394                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2395                         goto hw_free;
2396                 }
2397         }
2398
2399         return 0;
2400
2401 hw_free:
2402         dpcm_be_dai_hw_free(fe, stream);
2403 close:
2404         dpcm_be_dai_shutdown(fe, stream);
2405 disconnect:
2406         /* disconnect any non started BEs */
2407         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2408                 struct snd_soc_pcm_runtime *be = dpcm->be;
2409                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2410                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2411         }
2412
2413         return ret;
2414 }
2415
2416 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2417 {
2418         int ret;
2419
2420         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2421         ret = dpcm_run_update_startup(fe, stream);
2422         if (ret < 0)
2423                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2424         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2425
2426         return ret;
2427 }
2428
2429 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2430 {
2431         int ret;
2432
2433         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2434         ret = dpcm_run_update_shutdown(fe, stream);
2435         if (ret < 0)
2436                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2437         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2438
2439         return ret;
2440 }
2441
2442 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2443  * any DAI links.
2444  */
2445 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2446 {
2447         struct snd_soc_pcm_runtime *fe;
2448         int old, new, paths;
2449
2450         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2451         list_for_each_entry(fe, &card->rtd_list, list) {
2452                 struct snd_soc_dapm_widget_list *list;
2453
2454                 /* make sure link is FE */
2455                 if (!fe->dai_link->dynamic)
2456                         continue;
2457
2458                 /* only check active links */
2459                 if (!fe->cpu_dai->active)
2460                         continue;
2461
2462                 /* DAPM sync will call this to update DSP paths */
2463                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2464                         fe->dai_link->name);
2465
2466                 /* skip if FE doesn't have playback capability */
2467                 if (!fe->cpu_dai->driver->playback.channels_min
2468                     || !fe->codec_dai->driver->playback.channels_min)
2469                         goto capture;
2470
2471                 /* skip if FE isn't currently playing */
2472                 if (!fe->cpu_dai->playback_active
2473                     || !fe->codec_dai->playback_active)
2474                         goto capture;
2475
2476                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2477                 if (paths < 0) {
2478                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2479                                         fe->dai_link->name,  "playback");
2480                         mutex_unlock(&card->mutex);
2481                         return paths;
2482                 }
2483
2484                 /* update any new playback paths */
2485                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2486                 if (new) {
2487                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2488                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2489                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2490                 }
2491
2492                 /* update any old playback paths */
2493                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2494                 if (old) {
2495                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2496                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2497                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2498                 }
2499
2500                 dpcm_path_put(&list);
2501 capture:
2502                 /* skip if FE doesn't have capture capability */
2503                 if (!fe->cpu_dai->driver->capture.channels_min
2504                     || !fe->codec_dai->driver->capture.channels_min)
2505                         continue;
2506
2507                 /* skip if FE isn't currently capturing */
2508                 if (!fe->cpu_dai->capture_active
2509                     || !fe->codec_dai->capture_active)
2510                         continue;
2511
2512                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2513                 if (paths < 0) {
2514                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2515                                         fe->dai_link->name,  "capture");
2516                         mutex_unlock(&card->mutex);
2517                         return paths;
2518                 }
2519
2520                 /* update any new capture paths */
2521                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2522                 if (new) {
2523                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2524                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2525                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2526                 }
2527
2528                 /* update any old capture paths */
2529                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2530                 if (old) {
2531                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2532                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2533                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2534                 }
2535
2536                 dpcm_path_put(&list);
2537         }
2538
2539         mutex_unlock(&card->mutex);
2540         return 0;
2541 }
2542 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2543 {
2544         struct snd_soc_dpcm *dpcm;
2545         struct list_head *clients =
2546                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2547
2548         list_for_each_entry(dpcm, clients, list_be) {
2549
2550                 struct snd_soc_pcm_runtime *be = dpcm->be;
2551                 int i;
2552
2553                 if (be->dai_link->ignore_suspend)
2554                         continue;
2555
2556                 for (i = 0; i < be->num_codecs; i++) {
2557                         struct snd_soc_dai *dai = be->codec_dais[i];
2558                         struct snd_soc_dai_driver *drv = dai->driver;
2559
2560                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2561                                          be->dai_link->name);
2562
2563                         if (drv->ops && drv->ops->digital_mute &&
2564                                                         dai->playback_active)
2565                                 drv->ops->digital_mute(dai, mute);
2566                 }
2567         }
2568
2569         return 0;
2570 }
2571
2572 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2573 {
2574         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2575         struct snd_soc_dpcm *dpcm;
2576         struct snd_soc_dapm_widget_list *list;
2577         int ret;
2578         int stream = fe_substream->stream;
2579
2580         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2581         fe->dpcm[stream].runtime = fe_substream->runtime;
2582
2583         ret = dpcm_path_get(fe, stream, &list);
2584         if (ret < 0) {
2585                 mutex_unlock(&fe->card->mutex);
2586                 return ret;
2587         } else if (ret == 0) {
2588                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2589                         fe->dai_link->name, stream ? "capture" : "playback");
2590         }
2591
2592         /* calculate valid and active FE <-> BE dpcms */
2593         dpcm_process_paths(fe, stream, &list, 1);
2594
2595         ret = dpcm_fe_dai_startup(fe_substream);
2596         if (ret < 0) {
2597                 /* clean up all links */
2598                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2599                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2600
2601                 dpcm_be_disconnect(fe, stream);
2602                 fe->dpcm[stream].runtime = NULL;
2603         }
2604
2605         dpcm_clear_pending_state(fe, stream);
2606         dpcm_path_put(&list);
2607         mutex_unlock(&fe->card->mutex);
2608         return ret;
2609 }
2610
2611 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2612 {
2613         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2614         struct snd_soc_dpcm *dpcm;
2615         int stream = fe_substream->stream, ret;
2616
2617         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2618         ret = dpcm_fe_dai_shutdown(fe_substream);
2619
2620         /* mark FE's links ready to prune */
2621         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2622                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2623
2624         dpcm_be_disconnect(fe, stream);
2625
2626         fe->dpcm[stream].runtime = NULL;
2627         mutex_unlock(&fe->card->mutex);
2628         return ret;
2629 }
2630
2631 static void soc_pcm_free(struct snd_pcm *pcm)
2632 {
2633         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
2634         struct snd_soc_component *component;
2635
2636         list_for_each_entry(component, &rtd->card->component_dev_list,
2637                             card_list) {
2638                 if (component->pcm_free)
2639                         component->pcm_free(pcm);
2640         }
2641 }
2642
2643 /* create a new pcm */
2644 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2645 {
2646         struct snd_soc_platform *platform = rtd->platform;
2647         struct snd_soc_dai *codec_dai;
2648         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2649         struct snd_soc_component *component;
2650         struct snd_pcm *pcm;
2651         char new_name[64];
2652         int ret = 0, playback = 0, capture = 0;
2653         int i;
2654
2655         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2656                 playback = rtd->dai_link->dpcm_playback;
2657                 capture = rtd->dai_link->dpcm_capture;
2658         } else {
2659                 for (i = 0; i < rtd->num_codecs; i++) {
2660                         codec_dai = rtd->codec_dais[i];
2661                         if (codec_dai->driver->playback.channels_min)
2662                                 playback = 1;
2663                         if (codec_dai->driver->capture.channels_min)
2664                                 capture = 1;
2665                 }
2666
2667                 capture = capture && cpu_dai->driver->capture.channels_min;
2668                 playback = playback && cpu_dai->driver->playback.channels_min;
2669         }
2670
2671         if (rtd->dai_link->playback_only) {
2672                 playback = 1;
2673                 capture = 0;
2674         }
2675
2676         if (rtd->dai_link->capture_only) {
2677                 playback = 0;
2678                 capture = 1;
2679         }
2680
2681         /* create the PCM */
2682         if (rtd->dai_link->no_pcm) {
2683                 snprintf(new_name, sizeof(new_name), "(%s)",
2684                         rtd->dai_link->stream_name);
2685
2686                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2687                                 playback, capture, &pcm);
2688         } else {
2689                 if (rtd->dai_link->dynamic)
2690                         snprintf(new_name, sizeof(new_name), "%s (*)",
2691                                 rtd->dai_link->stream_name);
2692                 else
2693                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2694                                 rtd->dai_link->stream_name,
2695                                 (rtd->num_codecs > 1) ?
2696                                 "multicodec" : rtd->codec_dai->name, num);
2697
2698                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2699                         capture, &pcm);
2700         }
2701         if (ret < 0) {
2702                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2703                         rtd->dai_link->name);
2704                 return ret;
2705         }
2706         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2707
2708         /* DAPM dai link stream work */
2709         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2710
2711         pcm->nonatomic = rtd->dai_link->nonatomic;
2712         rtd->pcm = pcm;
2713         pcm->private_data = rtd;
2714
2715         if (rtd->dai_link->no_pcm) {
2716                 if (playback)
2717                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2718                 if (capture)
2719                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2720                 goto out;
2721         }
2722
2723         /* ASoC PCM operations */
2724         if (rtd->dai_link->dynamic) {
2725                 rtd->ops.open           = dpcm_fe_dai_open;
2726                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2727                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2728                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2729                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2730                 rtd->ops.close          = dpcm_fe_dai_close;
2731                 rtd->ops.pointer        = soc_pcm_pointer;
2732                 rtd->ops.ioctl          = soc_pcm_ioctl;
2733         } else {
2734                 rtd->ops.open           = soc_pcm_open;
2735                 rtd->ops.hw_params      = soc_pcm_hw_params;
2736                 rtd->ops.prepare        = soc_pcm_prepare;
2737                 rtd->ops.trigger        = soc_pcm_trigger;
2738                 rtd->ops.hw_free        = soc_pcm_hw_free;
2739                 rtd->ops.close          = soc_pcm_close;
2740                 rtd->ops.pointer        = soc_pcm_pointer;
2741                 rtd->ops.ioctl          = soc_pcm_ioctl;
2742         }
2743
2744         if (platform->driver->ops) {
2745                 rtd->ops.ack            = platform->driver->ops->ack;
2746                 rtd->ops.copy_user      = platform->driver->ops->copy_user;
2747                 rtd->ops.copy_kernel    = platform->driver->ops->copy_kernel;
2748                 rtd->ops.fill_silence   = platform->driver->ops->fill_silence;
2749                 rtd->ops.page           = platform->driver->ops->page;
2750                 rtd->ops.mmap           = platform->driver->ops->mmap;
2751         }
2752
2753         if (playback)
2754                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2755
2756         if (capture)
2757                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2758
2759         list_for_each_entry(component, &rtd->card->component_dev_list, card_list) {
2760                 if (component->pcm_new) {
2761                         ret = component->pcm_new(rtd);
2762                         if (ret < 0) {
2763                                 dev_err(component->dev,
2764                                         "ASoC: pcm constructor failed: %d\n",
2765                                         ret);
2766                                 return ret;
2767                         }
2768                 }
2769         }
2770         pcm->private_free = soc_pcm_free;
2771 out:
2772         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2773                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2774                  cpu_dai->name);
2775         return ret;
2776 }
2777
2778 /* is the current PCM operation for this FE ? */
2779 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2780 {
2781         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2782                 return 1;
2783         return 0;
2784 }
2785 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2786
2787 /* is the current PCM operation for this BE ? */
2788 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2789                 struct snd_soc_pcm_runtime *be, int stream)
2790 {
2791         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2792            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2793                   be->dpcm[stream].runtime_update))
2794                 return 1;
2795         return 0;
2796 }
2797 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2798
2799 /* get the substream for this BE */
2800 struct snd_pcm_substream *
2801         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2802 {
2803         return be->pcm->streams[stream].substream;
2804 }
2805 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2806
2807 /* get the BE runtime state */
2808 enum snd_soc_dpcm_state
2809         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2810 {
2811         return be->dpcm[stream].state;
2812 }
2813 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2814
2815 /* set the BE runtime state */
2816 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2817                 int stream, enum snd_soc_dpcm_state state)
2818 {
2819         be->dpcm[stream].state = state;
2820 }
2821 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2822
2823 /*
2824  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2825  * are not running, paused or suspended for the specified stream direction.
2826  */
2827 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2828                 struct snd_soc_pcm_runtime *be, int stream)
2829 {
2830         struct snd_soc_dpcm *dpcm;
2831         int state;
2832
2833         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2834
2835                 if (dpcm->fe == fe)
2836                         continue;
2837
2838                 state = dpcm->fe->dpcm[stream].state;
2839                 if (state == SND_SOC_DPCM_STATE_START ||
2840                         state == SND_SOC_DPCM_STATE_PAUSED ||
2841                         state == SND_SOC_DPCM_STATE_SUSPEND)
2842                         return 0;
2843         }
2844
2845         /* it's safe to free/stop this BE DAI */
2846         return 1;
2847 }
2848 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2849
2850 /*
2851  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2852  * running, paused or suspended for the specified stream direction.
2853  */
2854 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2855                 struct snd_soc_pcm_runtime *be, int stream)
2856 {
2857         struct snd_soc_dpcm *dpcm;
2858         int state;
2859
2860         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2861
2862                 if (dpcm->fe == fe)
2863                         continue;
2864
2865                 state = dpcm->fe->dpcm[stream].state;
2866                 if (state == SND_SOC_DPCM_STATE_START ||
2867                         state == SND_SOC_DPCM_STATE_PAUSED ||
2868                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2869                         state == SND_SOC_DPCM_STATE_PREPARE)
2870                         return 0;
2871         }
2872
2873         /* it's safe to change hw_params */
2874         return 1;
2875 }
2876 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2877
2878 #ifdef CONFIG_DEBUG_FS
2879 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
2880 {
2881         switch (state) {
2882         case SND_SOC_DPCM_STATE_NEW:
2883                 return "new";
2884         case SND_SOC_DPCM_STATE_OPEN:
2885                 return "open";
2886         case SND_SOC_DPCM_STATE_HW_PARAMS:
2887                 return "hw_params";
2888         case SND_SOC_DPCM_STATE_PREPARE:
2889                 return "prepare";
2890         case SND_SOC_DPCM_STATE_START:
2891                 return "start";
2892         case SND_SOC_DPCM_STATE_STOP:
2893                 return "stop";
2894         case SND_SOC_DPCM_STATE_SUSPEND:
2895                 return "suspend";
2896         case SND_SOC_DPCM_STATE_PAUSED:
2897                 return "paused";
2898         case SND_SOC_DPCM_STATE_HW_FREE:
2899                 return "hw_free";
2900         case SND_SOC_DPCM_STATE_CLOSE:
2901                 return "close";
2902         }
2903
2904         return "unknown";
2905 }
2906
2907 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2908                                 int stream, char *buf, size_t size)
2909 {
2910         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2911         struct snd_soc_dpcm *dpcm;
2912         ssize_t offset = 0;
2913
2914         /* FE state */
2915         offset += snprintf(buf + offset, size - offset,
2916                         "[%s - %s]\n", fe->dai_link->name,
2917                         stream ? "Capture" : "Playback");
2918
2919         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2920                         dpcm_state_string(fe->dpcm[stream].state));
2921
2922         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2923             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2924                 offset += snprintf(buf + offset, size - offset,
2925                                 "Hardware Params: "
2926                                 "Format = %s, Channels = %d, Rate = %d\n",
2927                                 snd_pcm_format_name(params_format(params)),
2928                                 params_channels(params),
2929                                 params_rate(params));
2930
2931         /* BEs state */
2932         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2933
2934         if (list_empty(&fe->dpcm[stream].be_clients)) {
2935                 offset += snprintf(buf + offset, size - offset,
2936                                 " No active DSP links\n");
2937                 goto out;
2938         }
2939
2940         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2941                 struct snd_soc_pcm_runtime *be = dpcm->be;
2942                 params = &dpcm->hw_params;
2943
2944                 offset += snprintf(buf + offset, size - offset,
2945                                 "- %s\n", be->dai_link->name);
2946
2947                 offset += snprintf(buf + offset, size - offset,
2948                                 "   State: %s\n",
2949                                 dpcm_state_string(be->dpcm[stream].state));
2950
2951                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2952                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2953                         offset += snprintf(buf + offset, size - offset,
2954                                 "   Hardware Params: "
2955                                 "Format = %s, Channels = %d, Rate = %d\n",
2956                                 snd_pcm_format_name(params_format(params)),
2957                                 params_channels(params),
2958                                 params_rate(params));
2959         }
2960
2961 out:
2962         return offset;
2963 }
2964
2965 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2966                                 size_t count, loff_t *ppos)
2967 {
2968         struct snd_soc_pcm_runtime *fe = file->private_data;
2969         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2970         char *buf;
2971
2972         buf = kmalloc(out_count, GFP_KERNEL);
2973         if (!buf)
2974                 return -ENOMEM;
2975
2976         if (fe->cpu_dai->driver->playback.channels_min)
2977                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2978                                         buf + offset, out_count - offset);
2979
2980         if (fe->cpu_dai->driver->capture.channels_min)
2981                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2982                                         buf + offset, out_count - offset);
2983
2984         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2985
2986         kfree(buf);
2987         return ret;
2988 }
2989
2990 static const struct file_operations dpcm_state_fops = {
2991         .open = simple_open,
2992         .read = dpcm_state_read_file,
2993         .llseek = default_llseek,
2994 };
2995
2996 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2997 {
2998         if (!rtd->dai_link)
2999                 return;
3000
3001         if (!rtd->card->debugfs_card_root)
3002                 return;
3003
3004         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
3005                         rtd->card->debugfs_card_root);
3006         if (!rtd->debugfs_dpcm_root) {
3007                 dev_dbg(rtd->dev,
3008                          "ASoC: Failed to create dpcm debugfs directory %s\n",
3009                          rtd->dai_link->name);
3010                 return;
3011         }
3012
3013         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
3014                                                 rtd->debugfs_dpcm_root,
3015                                                 rtd, &dpcm_state_fops);
3016 }
3017 #endif