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_put(platform->dev);
 603         for (i = 0; i < rtd->num_codecs; i++)
 604                 pm_runtime_put(rtd->codec_dais[i]->dev);
 605         pm_runtime_put(cpu_dai->dev);
 606         for (i = 0; i < rtd->num_codecs; i++) {
 607                 if (!rtd->codec_dais[i]->active)
 608                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 609         }
 610         if (!cpu_dai->active)
 611                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 612
 613         return ret;
 614 }
 615
 616 /*
 617  * Power down the audio subsystem pmdown_time msecs after close is called.
 618  * This is to ensure there are no pops or clicks in between any music tracks
 619  * due to DAPM power cycling.
 620  */
 621 static void close_delayed_work(struct work_struct *work)
 622 {
 623         struct snd_soc_pcm_runtime *rtd =
 624                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 625         struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
 626
 627         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 628
 629         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 630                  codec_dai->driver->playback.stream_name,
 631                  codec_dai->playback_active ? "active" : "inactive",
 632                  rtd->pop_wait ? "yes" : "no");
 633
 634         /* are we waiting on this codec DAI stream */
 635         if (rtd->pop_wait == 1) {
 636                 rtd->pop_wait = 0;
 637                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 638                                           SND_SOC_DAPM_STREAM_STOP);
 639         }
 640
 641         mutex_unlock(&rtd->pcm_mutex);
 642 }
 643
 644 /*
 645  * Called by ALSA when a PCM substream is closed. Private data can be
 646  * freed here. The cpu DAI, codec DAI, machine and platform are also
 647  * shutdown.
 648  */
 649 static int soc_pcm_close(struct snd_pcm_substream *substream)
 650 {
 651         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 652         struct snd_soc_platform *platform = rtd->platform;
 653         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 654         struct snd_soc_dai *codec_dai;
 655         int i;
 656
 657         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 658
 659         snd_soc_runtime_deactivate(rtd, substream->stream);
 660
 661         /* clear the corresponding DAIs rate when inactive */
 662         if (!cpu_dai->active)
 663                 cpu_dai->rate = 0;
 664
 665         for (i = 0; i < rtd->num_codecs; i++) {
 666                 codec_dai = rtd->codec_dais[i];
 667                 if (!codec_dai->active)
 668                         codec_dai->rate = 0;
 669         }
 670
 671         snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
 672
 673         if (cpu_dai->driver->ops->shutdown)
 674                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 675
 676         for (i = 0; i < rtd->num_codecs; i++) {
 677                 codec_dai = rtd->codec_dais[i];
 678                 if (codec_dai->driver->ops->shutdown)
 679                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 680         }
 681
 682         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 683                 rtd->dai_link->ops->shutdown(substream);
 684
 685         if (platform->driver->ops && platform->driver->ops->close)
 686                 platform->driver->ops->close(substream);
 687
 688         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 689                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
 690                         /* powered down playback stream now */
 691                         snd_soc_dapm_stream_event(rtd,
 692                                                   SNDRV_PCM_STREAM_PLAYBACK,
 693                                                   SND_SOC_DAPM_STREAM_STOP);
 694                 } else {
 695                         /* start delayed pop wq here for playback streams */
 696                         rtd->pop_wait = 1;
 697                         queue_delayed_work(system_power_efficient_wq,
 698                                            &rtd->delayed_work,
 699                                            msecs_to_jiffies(rtd->pmdown_time));
 700                 }
 701         } else {
 702                 /* capture streams can be powered down now */
 703                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 704                                           SND_SOC_DAPM_STREAM_STOP);
 705         }
 706
 707         mutex_unlock(&rtd->pcm_mutex);
 708
 709         pm_runtime_put(platform->dev);
 710         for (i = 0; i < rtd->num_codecs; i++)
 711                 pm_runtime_put(rtd->codec_dais[i]->dev);
 712         pm_runtime_put(cpu_dai->dev);
 713         for (i = 0; i < rtd->num_codecs; i++) {
 714                 if (!rtd->codec_dais[i]->active)
 715                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 716         }
 717         if (!cpu_dai->active)
 718                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 719
 720         return 0;
 721 }
 722
 723 /*
 724  * Called by ALSA when the PCM substream is prepared, can set format, sample
 725  * rate, etc.  This function is non atomic and can be called multiple times,
 726  * it can refer to the runtime info.
 727  */
 728 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 729 {
 730         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 731         struct snd_soc_platform *platform = rtd->platform;
 732         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 733         struct snd_soc_dai *codec_dai;
 734         int i, ret = 0;
 735
 736         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 737
 738         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 739                 ret = rtd->dai_link->ops->prepare(substream);
 740                 if (ret < 0) {
 741                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 742                                 " %d\n", ret);
 743                         goto out;
 744                 }
 745         }
 746
 747         if (platform->driver->ops && platform->driver->ops->prepare) {
 748                 ret = platform->driver->ops->prepare(substream);
 749                 if (ret < 0) {
 750                         dev_err(platform->dev, "ASoC: platform prepare error:"
 751                                 " %d\n", ret);
 752                         goto out;
 753                 }
 754         }
 755
 756         for (i = 0; i < rtd->num_codecs; i++) {
 757                 codec_dai = rtd->codec_dais[i];
 758                 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
 759                         ret = codec_dai->driver->ops->prepare(substream,
 760                                                               codec_dai);
 761                         if (ret < 0) {
 762                                 dev_err(codec_dai->dev,
 763                                         "ASoC: codec DAI prepare error: %d\n",
 764                                         ret);
 765                                 goto out;
 766                         }
 767                 }
 768         }
 769
 770         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 771                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 772                 if (ret < 0) {
 773                         dev_err(cpu_dai->dev,
 774                                 "ASoC: cpu DAI prepare error: %d\n", ret);
 775                         goto out;
 776                 }
 777         }
 778
 779         /* cancel any delayed stream shutdown that is pending */
 780         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 781             rtd->pop_wait) {
 782                 rtd->pop_wait = 0;
 783                 cancel_delayed_work(&rtd->delayed_work);
 784         }
 785
 786         snd_soc_dapm_stream_event(rtd, substream->stream,
 787                         SND_SOC_DAPM_STREAM_START);
 788
 789         for (i = 0; i < rtd->num_codecs; i++)
 790                 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
 791                                          substream->stream);
 792         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
 793
 794 out:
 795         mutex_unlock(&rtd->pcm_mutex);
 796         return ret;
 797 }
 798
 799 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 800                                        unsigned int mask)
 801 {
 802         struct snd_interval *interval;
 803         int channels = hweight_long(mask);
 804
 805         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 806         interval->min = channels;
 807         interval->max = channels;
 808 }
 809
 810 int soc_dai_hw_params(struct snd_pcm_substream *substream,
 811                       struct snd_pcm_hw_params *params,
 812                       struct snd_soc_dai *dai)
 813 {
 814         int ret;
 815
 816         if (dai->driver->ops && dai->driver->ops->hw_params) {
 817                 ret = dai->driver->ops->hw_params(substream, params, dai);
 818                 if (ret < 0) {
 819                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
 820                                 dai->name, ret);
 821                         return ret;
 822                 }
 823         }
 824
 825         return 0;
 826 }
 827
 828 /*
 829  * Called by ALSA when the hardware params are set by application. This
 830  * function can also be called multiple times and can allocate buffers
 831  * (using snd_pcm_lib_* ). It's non-atomic.
 832  */
 833 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 834                                 struct snd_pcm_hw_params *params)
 835 {
 836         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 837         struct snd_soc_platform *platform = rtd->platform;
 838         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 839         int i, ret = 0;
 840
 841         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 842
 843         ret = soc_pcm_params_symmetry(substream, params);
 844         if (ret)
 845                 goto out;
 846
 847         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 848                 ret = rtd->dai_link->ops->hw_params(substream, params);
 849                 if (ret < 0) {
 850                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 851                                 " failed: %d\n", ret);
 852                         goto out;
 853                 }
 854         }
 855
 856         for (i = 0; i < rtd->num_codecs; i++) {
 857                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 858                 struct snd_pcm_hw_params codec_params;
 859
 860                 /*
 861                  * Skip CODECs which don't support the current stream type,
 862                  * the idea being that if a CODEC is not used for the currently
 863                  * set up transfer direction, it should not need to be
 864                  * configured, especially since the configuration used might
 865                  * not even be supported by that CODEC. There may be cases
 866                  * however where a CODEC needs to be set up although it is
 867                  * actually not being used for the transfer, e.g. if a
 868                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
 869                  * for the DAI link including a playback-only CODEC.
 870                  * If this becomes necessary, we will have to augment the
 871                  * machine driver setup with information on how to act, so
 872                  * we can do the right thing here.
 873                  */
 874                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 875                         continue;
 876
 877                 /* copy params for each codec */
 878                 codec_params = *params;
 879
 880                 /* fixup params based on TDM slot masks */
 881                 if (codec_dai->tx_mask)
 882                         soc_pcm_codec_params_fixup(&codec_params,
 883                                                    codec_dai->tx_mask);
 884                 if (codec_dai->rx_mask)
 885                         soc_pcm_codec_params_fixup(&codec_params,
 886                                                    codec_dai->rx_mask);
 887
 888                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
 889                 if(ret < 0)
 890                         goto codec_err;
 891
 892                 codec_dai->rate = params_rate(&codec_params);
 893                 codec_dai->channels = params_channels(&codec_params);
 894                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 895                                                 params_format(&codec_params));
 896         }
 897
 898         ret = soc_dai_hw_params(substream, params, cpu_dai);
 899         if (ret < 0)
 900                 goto interface_err;
 901
 902         if (platform->driver->ops && platform->driver->ops->hw_params) {
 903                 ret = platform->driver->ops->hw_params(substream, params);
 904                 if (ret < 0) {
 905                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 906                                platform->component.name, ret);
 907                         goto platform_err;
 908                 }
 909         }
 910
 911         /* store the parameters for each DAIs */
 912         cpu_dai->rate = params_rate(params);
 913         cpu_dai->channels = params_channels(params);
 914         cpu_dai->sample_bits =
 915                 snd_pcm_format_physical_width(params_format(params));
 916
 917 out:
 918         mutex_unlock(&rtd->pcm_mutex);
 919         return ret;
 920
 921 platform_err:
 922         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 923                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 924
 925 interface_err:
 926         i = rtd->num_codecs;
 927
 928 codec_err:
 929         while (--i >= 0) {
 930                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 931                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 932                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 933                 codec_dai->rate = 0;
 934         }
 935
 936         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 937                 rtd->dai_link->ops->hw_free(substream);
 938
 939         mutex_unlock(&rtd->pcm_mutex);
 940         return ret;
 941 }
 942
 943 /*
 944  * Frees resources allocated by hw_params, can be called multiple times
 945  */
 946 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 947 {
 948         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 949         struct snd_soc_platform *platform = rtd->platform;
 950         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 951         struct snd_soc_dai *codec_dai;
 952         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 953         int i;
 954
 955         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 956
 957         /* clear the corresponding DAIs parameters when going to be inactive */
 958         if (cpu_dai->active == 1) {
 959                 cpu_dai->rate = 0;
 960                 cpu_dai->channels = 0;
 961                 cpu_dai->sample_bits = 0;
 962         }
 963
 964         for (i = 0; i < rtd->num_codecs; i++) {
 965                 codec_dai = rtd->codec_dais[i];
 966                 if (codec_dai->active == 1) {
 967                         codec_dai->rate = 0;
 968                         codec_dai->channels = 0;
 969                         codec_dai->sample_bits = 0;
 970                 }
 971         }
 972
 973         /* apply codec digital mute */
 974         for (i = 0; i < rtd->num_codecs; i++) {
 975                 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
 976                     (!playback && rtd->codec_dais[i]->capture_active == 1))
 977                         snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
 978                                                  substream->stream);
 979         }
 980
 981         /* free any machine hw params */
 982         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 983                 rtd->dai_link->ops->hw_free(substream);
 984
 985         /* free any DMA resources */
 986         if (platform->driver->ops && platform->driver->ops->hw_free)
 987                 platform->driver->ops->hw_free(substream);
 988
 989         /* now free hw params for the DAIs  */
 990         for (i = 0; i < rtd->num_codecs; i++) {
 991                 codec_dai = rtd->codec_dais[i];
 992                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 993                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 994         }
 995
 996         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 997                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 998
 999         mutex_unlock(&rtd->pcm_mutex);
1000         return 0;
1001 }
1002
1003 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1004 {
1005         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1006         struct snd_soc_platform *platform = rtd->platform;
1007         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1008         struct snd_soc_dai *codec_dai;
1009         int i, ret;
1010
1011         for (i = 0; i < rtd->num_codecs; i++) {
1012                 codec_dai = rtd->codec_dais[i];
1013                 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
1014                         ret = codec_dai->driver->ops->trigger(substream,
1015                                                               cmd, codec_dai);
1016                         if (ret < 0)
1017                                 return ret;
1018                 }
1019         }
1020
1021         if (platform->driver->ops && platform->driver->ops->trigger) {
1022                 ret = platform->driver->ops->trigger(substream, cmd);
1023                 if (ret < 0)
1024                         return ret;
1025         }
1026
1027         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
1028                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
1029                 if (ret < 0)
1030                         return ret;
1031         }
1032
1033         if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1034                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1035                 if (ret < 0)
1036                         return ret;
1037         }
1038
1039         return 0;
1040 }
1041
1042 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1043                                    int cmd)
1044 {
1045         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1046         struct snd_soc_platform *platform = rtd->platform;
1047         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1048         struct snd_soc_dai *codec_dai;
1049         int i, ret;
1050
1051         for (i = 0; i < rtd->num_codecs; i++) {
1052                 codec_dai = rtd->codec_dais[i];
1053                 if (codec_dai->driver->ops &&
1054                     codec_dai->driver->ops->bespoke_trigger) {
1055                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1056                                                                 cmd, codec_dai);
1057                         if (ret < 0)
1058                                 return ret;
1059                 }
1060         }
1061
1062         if (platform->driver->bespoke_trigger) {
1063                 ret = platform->driver->bespoke_trigger(substream, cmd);
1064                 if (ret < 0)
1065                         return ret;
1066         }
1067
1068         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1069                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1070                 if (ret < 0)
1071                         return ret;
1072         }
1073         return 0;
1074 }
1075 /*
1076  * soc level wrapper for pointer callback
1077  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1078  * the runtime->delay will be updated accordingly.
1079  */
1080 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1081 {
1082         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1083         struct snd_soc_platform *platform = rtd->platform;
1084         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1085         struct snd_soc_dai *codec_dai;
1086         struct snd_pcm_runtime *runtime = substream->runtime;
1087         snd_pcm_uframes_t offset = 0;
1088         snd_pcm_sframes_t delay = 0;
1089         snd_pcm_sframes_t codec_delay = 0;
1090         int i;
1091
1092         if (platform->driver->ops && platform->driver->ops->pointer)
1093                 offset = platform->driver->ops->pointer(substream);
1094
1095         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1096                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1097
1098         for (i = 0; i < rtd->num_codecs; i++) {
1099                 codec_dai = rtd->codec_dais[i];
1100                 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1101                         codec_delay = max(codec_delay,
1102                                         codec_dai->driver->ops->delay(substream,
1103                                                                     codec_dai));
1104         }
1105         delay += codec_delay;
1106
1107         /*
1108          * None of the existing platform drivers implement delay(), so
1109          * for now the codec_dai of first multicodec entry is used
1110          */
1111         if (platform->driver->delay)
1112                 delay += platform->driver->delay(substream, rtd->codec_dais[0]);
1113
1114         runtime->delay = delay;
1115
1116         return offset;
1117 }
1118
1119 /* connect a FE and BE */
1120 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1121                 struct snd_soc_pcm_runtime *be, int stream)
1122 {
1123         struct snd_soc_dpcm *dpcm;
1124
1125         /* only add new dpcms */
1126         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1127                 if (dpcm->be == be && dpcm->fe == fe)
1128                         return 0;
1129         }
1130
1131         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1132         if (!dpcm)
1133                 return -ENOMEM;
1134
1135         dpcm->be = be;
1136         dpcm->fe = fe;
1137         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1138         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1139         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1140         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1141
1142         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1143                         stream ? "capture" : "playback",  fe->dai_link->name,
1144                         stream ? "<-" : "->", be->dai_link->name);
1145
1146 #ifdef CONFIG_DEBUG_FS
1147         if (fe->debugfs_dpcm_root)
1148                 dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1149                                 fe->debugfs_dpcm_root, &dpcm->state);
1150 #endif
1151         return 1;
1152 }
1153
1154 /* reparent a BE onto another FE */
1155 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1156                         struct snd_soc_pcm_runtime *be, int stream)
1157 {
1158         struct snd_soc_dpcm *dpcm;
1159         struct snd_pcm_substream *fe_substream, *be_substream;
1160
1161         /* reparent if BE is connected to other FEs */
1162         if (!be->dpcm[stream].users)
1163                 return;
1164
1165         be_substream = snd_soc_dpcm_get_substream(be, stream);
1166
1167         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1168                 if (dpcm->fe == fe)
1169                         continue;
1170
1171                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1172                         stream ? "capture" : "playback",
1173                         dpcm->fe->dai_link->name,
1174                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1175
1176                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1177                 be_substream->runtime = fe_substream->runtime;
1178                 break;
1179         }
1180 }
1181
1182 /* disconnect a BE and FE */
1183 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1184 {
1185         struct snd_soc_dpcm *dpcm, *d;
1186
1187         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1188                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1189                                 stream ? "capture" : "playback",
1190                                 dpcm->be->dai_link->name);
1191
1192                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1193                         continue;
1194
1195                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1196                         stream ? "capture" : "playback", fe->dai_link->name,
1197                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1198
1199                 /* BEs still alive need new FE */
1200                 dpcm_be_reparent(fe, dpcm->be, stream);
1201
1202 #ifdef CONFIG_DEBUG_FS
1203                 debugfs_remove(dpcm->debugfs_state);
1204 #endif
1205                 list_del(&dpcm->list_be);
1206                 list_del(&dpcm->list_fe);
1207                 kfree(dpcm);
1208         }
1209 }
1210
1211 /* get BE for DAI widget and stream */
1212 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1213                 struct snd_soc_dapm_widget *widget, int stream)
1214 {
1215         struct snd_soc_pcm_runtime *be;
1216         int i, j;
1217
1218         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1219                 for (i = 0; i < card->num_links; i++) {
1220                         be = &card->rtd[i];
1221
1222                         if (!be->dai_link->no_pcm)
1223                                 continue;
1224
1225                         if (be->cpu_dai->playback_widget == widget)
1226                                 return be;
1227
1228                         for (j = 0; j < be->num_codecs; j++) {
1229                                 struct snd_soc_dai *dai = be->codec_dais[j];
1230                                 if (dai->playback_widget == widget)
1231                                         return be;
1232                         }
1233                 }
1234         } else {
1235
1236                 for (i = 0; i < card->num_links; i++) {
1237                         be = &card->rtd[i];
1238
1239                         if (!be->dai_link->no_pcm)
1240                                 continue;
1241
1242                         if (be->cpu_dai->capture_widget == widget)
1243                                 return be;
1244
1245                         for (j = 0; j < be->num_codecs; j++) {
1246                                 struct snd_soc_dai *dai = be->codec_dais[j];
1247                                 if (dai->capture_widget == widget)
1248                                         return be;
1249                         }
1250                 }
1251         }
1252
1253         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1254                 stream ? "capture" : "playback", widget->name);
1255         return NULL;
1256 }
1257
1258 static inline struct snd_soc_dapm_widget *
1259         dai_get_widget(struct snd_soc_dai *dai, int stream)
1260 {
1261         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1262                 return dai->playback_widget;
1263         else
1264                 return dai->capture_widget;
1265 }
1266
1267 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1268                 struct snd_soc_dapm_widget *widget)
1269 {
1270         int i;
1271
1272         for (i = 0; i < list->num_widgets; i++) {
1273                 if (widget == list->widgets[i])
1274                         return 1;
1275         }
1276
1277         return 0;
1278 }
1279
1280 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1281         int stream, struct snd_soc_dapm_widget_list **list)
1282 {
1283         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1284         int paths;
1285
1286         /* get number of valid DAI paths and their widgets */
1287         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list);
1288
1289         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1290                         stream ? "capture" : "playback");
1291
1292         return paths;
1293 }
1294
1295 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1296         struct snd_soc_dapm_widget_list **list_)
1297 {
1298         struct snd_soc_dpcm *dpcm;
1299         struct snd_soc_dapm_widget_list *list = *list_;
1300         struct snd_soc_dapm_widget *widget;
1301         int prune = 0;
1302
1303         /* Destroy any old FE <--> BE connections */
1304         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1305                 unsigned int i;
1306
1307                 /* is there a valid CPU DAI widget for this BE */
1308                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1309
1310                 /* prune the BE if it's no longer in our active list */
1311                 if (widget && widget_in_list(list, widget))
1312                         continue;
1313
1314                 /* is there a valid CODEC DAI widget for this BE */
1315                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1316                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1317                         widget = dai_get_widget(dai, stream);
1318
1319                         /* prune the BE if it's no longer in our active list */
1320                         if (widget && widget_in_list(list, widget))
1321                                 continue;
1322                 }
1323
1324                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1325                         stream ? "capture" : "playback",
1326                         dpcm->be->dai_link->name, fe->dai_link->name);
1327                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1328                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1329                 prune++;
1330         }
1331
1332         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1333         return prune;
1334 }
1335
1336 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1337         struct snd_soc_dapm_widget_list **list_)
1338 {
1339         struct snd_soc_card *card = fe->card;
1340         struct snd_soc_dapm_widget_list *list = *list_;
1341         struct snd_soc_pcm_runtime *be;
1342         int i, new = 0, err;
1343
1344         /* Create any new FE <--> BE connections */
1345         for (i = 0; i < list->num_widgets; i++) {
1346
1347                 switch (list->widgets[i]->id) {
1348                 case snd_soc_dapm_dai_in:
1349                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1350                                 continue;
1351                         break;
1352                 case snd_soc_dapm_dai_out:
1353                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1354                                 continue;
1355                         break;
1356                 default:
1357                         continue;
1358                 }
1359
1360                 /* is there a valid BE rtd for this widget */
1361                 be = dpcm_get_be(card, list->widgets[i], stream);
1362                 if (!be) {
1363                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1364                                         list->widgets[i]->name);
1365                         continue;
1366                 }
1367
1368                 /* make sure BE is a real BE */
1369                 if (!be->dai_link->no_pcm)
1370                         continue;
1371
1372                 /* don't connect if FE is not running */
1373                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1374                         continue;
1375
1376                 /* newly connected FE and BE */
1377                 err = dpcm_be_connect(fe, be, stream);
1378                 if (err < 0) {
1379                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1380                                 list->widgets[i]->name);
1381                         break;
1382                 } else if (err == 0) /* already connected */
1383                         continue;
1384
1385                 /* new */
1386                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1387                 new++;
1388         }
1389
1390         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1391         return new;
1392 }
1393
1394 /*
1395  * Find the corresponding BE DAIs that source or sink audio to this
1396  * FE substream.
1397  */
1398 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1399         int stream, struct snd_soc_dapm_widget_list **list, int new)
1400 {
1401         if (new)
1402                 return dpcm_add_paths(fe, stream, list);
1403         else
1404                 return dpcm_prune_paths(fe, stream, list);
1405 }
1406
1407 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1408 {
1409         struct snd_soc_dpcm *dpcm;
1410
1411         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1412                 dpcm->be->dpcm[stream].runtime_update =
1413                                                 SND_SOC_DPCM_UPDATE_NO;
1414 }
1415
1416 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1417         int stream)
1418 {
1419         struct snd_soc_dpcm *dpcm;
1420
1421         /* disable any enabled and non active backends */
1422         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1423
1424                 struct snd_soc_pcm_runtime *be = dpcm->be;
1425                 struct snd_pcm_substream *be_substream =
1426                         snd_soc_dpcm_get_substream(be, stream);
1427
1428                 if (be->dpcm[stream].users == 0)
1429                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1430                                 stream ? "capture" : "playback",
1431                                 be->dpcm[stream].state);
1432
1433                 if (--be->dpcm[stream].users != 0)
1434                         continue;
1435
1436                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1437                         continue;
1438
1439                 soc_pcm_close(be_substream);
1440                 be_substream->runtime = NULL;
1441                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1442         }
1443 }
1444
1445 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1446 {
1447         struct snd_soc_dpcm *dpcm;
1448         int err, count = 0;
1449
1450         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1451         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1452
1453                 struct snd_soc_pcm_runtime *be = dpcm->be;
1454                 struct snd_pcm_substream *be_substream =
1455                         snd_soc_dpcm_get_substream(be, stream);
1456
1457                 if (!be_substream) {
1458                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1459                                 stream ? "capture" : "playback");
1460                         continue;
1461                 }
1462
1463                 /* is this op for this BE ? */
1464                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1465                         continue;
1466
1467                 /* first time the dpcm is open ? */
1468                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1469                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1470                                 stream ? "capture" : "playback",
1471                                 be->dpcm[stream].state);
1472
1473                 if (be->dpcm[stream].users++ != 0)
1474                         continue;
1475
1476                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1477                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1478                         continue;
1479
1480                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1481                         stream ? "capture" : "playback", be->dai_link->name);
1482
1483                 be_substream->runtime = be->dpcm[stream].runtime;
1484                 err = soc_pcm_open(be_substream);
1485                 if (err < 0) {
1486                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1487                         be->dpcm[stream].users--;
1488                         if (be->dpcm[stream].users < 0)
1489                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1490                                         stream ? "capture" : "playback",
1491                                         be->dpcm[stream].state);
1492
1493                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1494                         goto unwind;
1495                 }
1496
1497                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1498                 count++;
1499         }
1500
1501         return count;
1502
1503 unwind:
1504         /* disable any enabled and non active backends */
1505         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1506                 struct snd_soc_pcm_runtime *be = dpcm->be;
1507                 struct snd_pcm_substream *be_substream =
1508                         snd_soc_dpcm_get_substream(be, stream);
1509
1510                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1511                         continue;
1512
1513                 if (be->dpcm[stream].users == 0)
1514                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1515                                 stream ? "capture" : "playback",
1516                                 be->dpcm[stream].state);
1517
1518                 if (--be->dpcm[stream].users != 0)
1519                         continue;
1520
1521                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1522                         continue;
1523
1524                 soc_pcm_close(be_substream);
1525                 be_substream->runtime = NULL;
1526                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1527         }
1528
1529         return err;
1530 }
1531
1532 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1533                                  struct snd_soc_pcm_stream *stream,
1534                                  u64 formats)
1535 {
1536         runtime->hw.rate_min = stream->rate_min;
1537         runtime->hw.rate_max = stream->rate_max;
1538         runtime->hw.channels_min = stream->channels_min;
1539         runtime->hw.channels_max = stream->channels_max;
1540         if (runtime->hw.formats)
1541                 runtime->hw.formats &= formats & stream->formats;
1542         else
1543                 runtime->hw.formats = formats & stream->formats;
1544         runtime->hw.rates = stream->rates;
1545 }
1546
1547 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1548 {
1549         struct snd_soc_pcm_runtime *fe = substream->private_data;
1550         struct snd_soc_dpcm *dpcm;
1551         u64 formats = ULLONG_MAX;
1552         int stream = substream->stream;
1553
1554         if (!fe->dai_link->dpcm_merged_format)
1555                 return formats;
1556
1557         /*
1558          * It returns merged BE codec format
1559          * if FE want to use it (= dpcm_merged_format)
1560          */
1561
1562         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1563                 struct snd_soc_pcm_runtime *be = dpcm->be;
1564                 struct snd_soc_dai_driver *codec_dai_drv;
1565                 struct snd_soc_pcm_stream *codec_stream;
1566                 int i;
1567
1568                 for (i = 0; i < be->num_codecs; i++) {
1569                         codec_dai_drv = be->codec_dais[i]->driver;
1570                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1571                                 codec_stream = &codec_dai_drv->playback;
1572                         else
1573                                 codec_stream = &codec_dai_drv->capture;
1574
1575                         formats &= codec_stream->formats;
1576                 }
1577         }
1578
1579         return formats;
1580 }
1581
1582 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1583 {
1584         struct snd_pcm_runtime *runtime = substream->runtime;
1585         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1586         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1587         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1588         u64 format = dpcm_runtime_base_format(substream);
1589
1590         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1591                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1592         else
1593                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1594 }
1595
1596 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1597
1598 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1599  * for avoiding the race with trigger callback.
1600  * If the state is unset and a trigger is pending while the previous operation,
1601  * process the pending trigger action here.
1602  */
1603 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1604                                      int stream, enum snd_soc_dpcm_update state)
1605 {
1606         struct snd_pcm_substream *substream =
1607                 snd_soc_dpcm_get_substream(fe, stream);
1608
1609         snd_pcm_stream_lock_irq(substream);
1610         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1611                 dpcm_fe_dai_do_trigger(substream,
1612                                        fe->dpcm[stream].trigger_pending - 1);
1613                 fe->dpcm[stream].trigger_pending = 0;
1614         }
1615         fe->dpcm[stream].runtime_update = state;
1616         snd_pcm_stream_unlock_irq(substream);
1617 }
1618
1619 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1620 {
1621         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1622         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1623         int stream = fe_substream->stream, ret = 0;
1624
1625         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1626
1627         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1628         if (ret < 0) {
1629                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1630                 goto be_err;
1631         }
1632
1633         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1634
1635         /* start the DAI frontend */
1636         ret = soc_pcm_open(fe_substream);
1637         if (ret < 0) {
1638                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1639                 goto unwind;
1640         }
1641
1642         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1643
1644         dpcm_set_fe_runtime(fe_substream);
1645         snd_pcm_limit_hw_rates(runtime);
1646
1647         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1648         return 0;
1649
1650 unwind:
1651         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1652 be_err:
1653         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1654         return ret;
1655 }
1656
1657 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1658 {
1659         struct snd_soc_dpcm *dpcm;
1660
1661         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1662         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1663
1664                 struct snd_soc_pcm_runtime *be = dpcm->be;
1665                 struct snd_pcm_substream *be_substream =
1666                         snd_soc_dpcm_get_substream(be, stream);
1667
1668                 /* is this op for this BE ? */
1669                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1670                         continue;
1671
1672                 if (be->dpcm[stream].users == 0)
1673                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1674                                 stream ? "capture" : "playback",
1675                                 be->dpcm[stream].state);
1676
1677                 if (--be->dpcm[stream].users != 0)
1678                         continue;
1679
1680                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1681                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1682                         continue;
1683
1684                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1685                         dpcm->fe->dai_link->name);
1686
1687                 soc_pcm_close(be_substream);
1688                 be_substream->runtime = NULL;
1689
1690                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1691         }
1692         return 0;
1693 }
1694
1695 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1696 {
1697         struct snd_soc_pcm_runtime *fe = substream->private_data;
1698         int stream = substream->stream;
1699
1700         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1701
1702         /* shutdown the BEs */
1703         dpcm_be_dai_shutdown(fe, substream->stream);
1704
1705         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1706
1707         /* now shutdown the frontend */
1708         soc_pcm_close(substream);
1709
1710         /* run the stream event for each BE */
1711         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1712
1713         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1714         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1715         return 0;
1716 }
1717
1718 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1719 {
1720         struct snd_soc_dpcm *dpcm;
1721
1722         /* only hw_params backends that are either sinks or sources
1723          * to this frontend DAI */
1724         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1725
1726                 struct snd_soc_pcm_runtime *be = dpcm->be;
1727                 struct snd_pcm_substream *be_substream =
1728                         snd_soc_dpcm_get_substream(be, stream);
1729
1730                 /* is this op for this BE ? */
1731                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1732                         continue;
1733
1734                 /* only free hw when no longer used - check all FEs */
1735                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1736                                 continue;
1737
1738                 /* do not free hw if this BE is used by other FE */
1739                 if (be->dpcm[stream].users > 1)
1740                         continue;
1741
1742                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1743                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1744                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1745                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1746                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1747                         continue;
1748
1749                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1750                         dpcm->fe->dai_link->name);
1751
1752                 soc_pcm_hw_free(be_substream);
1753
1754                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1755         }
1756
1757         return 0;
1758 }
1759
1760 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1761 {
1762         struct snd_soc_pcm_runtime *fe = substream->private_data;
1763         int err, stream = substream->stream;
1764
1765         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1766         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1767
1768         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1769
1770         /* call hw_free on the frontend */
1771         err = soc_pcm_hw_free(substream);
1772         if (err < 0)
1773                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1774                         fe->dai_link->name);
1775
1776         /* only hw_params backends that are either sinks or sources
1777          * to this frontend DAI */
1778         err = dpcm_be_dai_hw_free(fe, stream);
1779
1780         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1781         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1782
1783         mutex_unlock(&fe->card->mutex);
1784         return 0;
1785 }
1786
1787 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1788 {
1789         struct snd_soc_dpcm *dpcm;
1790         int ret;
1791
1792         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1793
1794                 struct snd_soc_pcm_runtime *be = dpcm->be;
1795                 struct snd_pcm_substream *be_substream =
1796                         snd_soc_dpcm_get_substream(be, stream);
1797
1798                 /* is this op for this BE ? */
1799                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1800                         continue;
1801
1802                 /* only allow hw_params() if no connected FEs are running */
1803                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1804                         continue;
1805
1806                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1807                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1808                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1809                         continue;
1810
1811                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1812                         dpcm->fe->dai_link->name);
1813
1814                 /* copy params for each dpcm */
1815                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1816                                 sizeof(struct snd_pcm_hw_params));
1817
1818                 /* perform any hw_params fixups */
1819                 if (be->dai_link->be_hw_params_fixup) {
1820                         ret = be->dai_link->be_hw_params_fixup(be,
1821                                         &dpcm->hw_params);
1822                         if (ret < 0) {
1823                                 dev_err(be->dev,
1824                                         "ASoC: hw_params BE fixup failed %d\n",
1825                                         ret);
1826                                 goto unwind;
1827                         }
1828                 }
1829
1830                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1831                 if (ret < 0) {
1832                         dev_err(dpcm->be->dev,
1833                                 "ASoC: hw_params BE failed %d\n", ret);
1834                         goto unwind;
1835                 }
1836
1837                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1838         }
1839         return 0;
1840
1841 unwind:
1842         /* disable any enabled and non active backends */
1843         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1844                 struct snd_soc_pcm_runtime *be = dpcm->be;
1845                 struct snd_pcm_substream *be_substream =
1846                         snd_soc_dpcm_get_substream(be, stream);
1847
1848                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1849                         continue;
1850
1851                 /* only allow hw_free() if no connected FEs are running */
1852                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1853                         continue;
1854
1855                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1856                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1857                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1858                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1859                         continue;
1860
1861                 soc_pcm_hw_free(be_substream);
1862         }
1863
1864         return ret;
1865 }
1866
1867 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1868                                  struct snd_pcm_hw_params *params)
1869 {
1870         struct snd_soc_pcm_runtime *fe = substream->private_data;
1871         int ret, stream = substream->stream;
1872
1873         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1874         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1875
1876         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1877                         sizeof(struct snd_pcm_hw_params));
1878         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1879         if (ret < 0) {
1880                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1881                 goto out;
1882         }
1883
1884         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1885                         fe->dai_link->name, params_rate(params),
1886                         params_channels(params), params_format(params));
1887
1888         /* call hw_params on the frontend */
1889         ret = soc_pcm_hw_params(substream, params);
1890         if (ret < 0) {
1891                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1892                 dpcm_be_dai_hw_free(fe, stream);
1893          } else
1894                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1895
1896 out:
1897         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1898         mutex_unlock(&fe->card->mutex);
1899         return ret;
1900 }
1901
1902 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1903                 struct snd_pcm_substream *substream, int cmd)
1904 {
1905         int ret;
1906
1907         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1908                         dpcm->fe->dai_link->name, cmd);
1909
1910         ret = soc_pcm_trigger(substream, cmd);
1911         if (ret < 0)
1912                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1913
1914         return ret;
1915 }
1916
1917 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1918                                int cmd)
1919 {
1920         struct snd_soc_dpcm *dpcm;
1921         int ret = 0;
1922
1923         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1924
1925                 struct snd_soc_pcm_runtime *be = dpcm->be;
1926                 struct snd_pcm_substream *be_substream =
1927                         snd_soc_dpcm_get_substream(be, stream);
1928
1929                 /* is this op for this BE ? */
1930                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1931                         continue;
1932
1933                 switch (cmd) {
1934                 case SNDRV_PCM_TRIGGER_START:
1935                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1936                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1937                                 continue;
1938
1939                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1940                         if (ret)
1941                                 return ret;
1942
1943                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1944                         break;
1945                 case SNDRV_PCM_TRIGGER_RESUME:
1946                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1947                                 continue;
1948
1949                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1950                         if (ret)
1951                                 return ret;
1952
1953                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1954                         break;
1955                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1956                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1957                                 continue;
1958
1959                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1960                         if (ret)
1961                                 return ret;
1962
1963                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1964                         break;
1965                 case SNDRV_PCM_TRIGGER_STOP:
1966                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1967                                 continue;
1968
1969                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1970                                 continue;
1971
1972                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1973                         if (ret)
1974                                 return ret;
1975
1976                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1977                         break;
1978                 case SNDRV_PCM_TRIGGER_SUSPEND:
1979                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1980                                 continue;
1981
1982                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1983                                 continue;
1984
1985                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1986                         if (ret)
1987                                 return ret;
1988
1989                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1990                         break;
1991                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1992                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1993                                 continue;
1994
1995                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1996                                 continue;
1997
1998                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1999                         if (ret)
2000                                 return ret;
2001
2002                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2003                         break;
2004                 }
2005         }
2006
2007         return ret;
2008 }
2009 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2010
2011 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2012 {
2013         struct snd_soc_pcm_runtime *fe = substream->private_data;
2014         int stream = substream->stream, ret;
2015         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2016
2017         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2018
2019         switch (trigger) {
2020         case SND_SOC_DPCM_TRIGGER_PRE:
2021                 /* call trigger on the frontend before the backend. */
2022
2023                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2024                                 fe->dai_link->name, cmd);
2025
2026                 ret = soc_pcm_trigger(substream, cmd);
2027                 if (ret < 0) {
2028                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2029                         goto out;
2030                 }
2031
2032                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2033                 break;
2034         case SND_SOC_DPCM_TRIGGER_POST:
2035                 /* call trigger on the frontend after the backend. */
2036
2037                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2038                 if (ret < 0) {
2039                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2040                         goto out;
2041                 }
2042
2043                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2044                                 fe->dai_link->name, cmd);
2045
2046                 ret = soc_pcm_trigger(substream, cmd);
2047                 break;
2048         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2049                 /* bespoke trigger() - handles both FE and BEs */
2050
2051                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2052                                 fe->dai_link->name, cmd);
2053
2054                 ret = soc_pcm_bespoke_trigger(substream, cmd);
2055                 if (ret < 0) {
2056                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2057                         goto out;
2058                 }
2059                 break;
2060         default:
2061                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2062                                 fe->dai_link->name);
2063                 ret = -EINVAL;
2064                 goto out;
2065         }
2066
2067         switch (cmd) {
2068         case SNDRV_PCM_TRIGGER_START:
2069         case SNDRV_PCM_TRIGGER_RESUME:
2070         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2071                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2072                 break;
2073         case SNDRV_PCM_TRIGGER_STOP:
2074         case SNDRV_PCM_TRIGGER_SUSPEND:
2075         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2076                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2077                 break;
2078         }
2079
2080 out:
2081         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2082         return ret;
2083 }
2084
2085 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2086 {
2087         struct snd_soc_pcm_runtime *fe = substream->private_data;
2088         int stream = substream->stream;
2089
2090         /* if FE's runtime_update is already set, we're in race;
2091          * process this trigger later at exit
2092          */
2093         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2094                 fe->dpcm[stream].trigger_pending = cmd + 1;
2095                 return 0; /* delayed, assuming it's successful */
2096         }
2097
2098         /* we're alone, let's trigger */
2099         return dpcm_fe_dai_do_trigger(substream, cmd);
2100 }
2101
2102 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2103 {
2104         struct snd_soc_dpcm *dpcm;
2105         int ret = 0;
2106
2107         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2108
2109                 struct snd_soc_pcm_runtime *be = dpcm->be;
2110                 struct snd_pcm_substream *be_substream =
2111                         snd_soc_dpcm_get_substream(be, stream);
2112
2113                 /* is this op for this BE ? */
2114                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2115                         continue;
2116
2117                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2118                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2119                         continue;
2120
2121                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2122                         dpcm->fe->dai_link->name);
2123
2124                 ret = soc_pcm_prepare(be_substream);
2125                 if (ret < 0) {
2126                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2127                                 ret);
2128                         break;
2129                 }
2130
2131                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2132         }
2133         return ret;
2134 }
2135
2136 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2137 {
2138         struct snd_soc_pcm_runtime *fe = substream->private_data;
2139         int stream = substream->stream, ret = 0;
2140
2141         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2142
2143         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2144
2145         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2146
2147         /* there is no point preparing this FE if there are no BEs */
2148         if (list_empty(&fe->dpcm[stream].be_clients)) {
2149                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2150                                 fe->dai_link->name);
2151                 ret = -EINVAL;
2152                 goto out;
2153         }
2154
2155         ret = dpcm_be_dai_prepare(fe, substream->stream);
2156         if (ret < 0)
2157                 goto out;
2158
2159         /* call prepare on the frontend */
2160         ret = soc_pcm_prepare(substream);
2161         if (ret < 0) {
2162                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2163                         fe->dai_link->name);
2164                 goto out;
2165         }
2166
2167         /* run the stream event for each BE */
2168         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2169         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2170
2171 out:
2172         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2173         mutex_unlock(&fe->card->mutex);
2174
2175         return ret;
2176 }
2177
2178 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2179                      unsigned int cmd, void *arg)
2180 {
2181         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2182         struct snd_soc_platform *platform = rtd->platform;
2183
2184         if (platform->driver->ops && platform->driver->ops->ioctl)
2185                 return platform->driver->ops->ioctl(substream, cmd, arg);
2186         return snd_pcm_lib_ioctl(substream, cmd, arg);
2187 }
2188
2189 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2190 {
2191         struct snd_pcm_substream *substream =
2192                 snd_soc_dpcm_get_substream(fe, stream);
2193         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2194         int err;
2195
2196         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2197                         stream ? "capture" : "playback", fe->dai_link->name);
2198
2199         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2200                 /* call bespoke trigger - FE takes care of all BE triggers */
2201                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2202                                 fe->dai_link->name);
2203
2204                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2205                 if (err < 0)
2206                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2207         } else {
2208                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2209                         fe->dai_link->name);
2210
2211                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2212                 if (err < 0)
2213                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2214         }
2215
2216         err = dpcm_be_dai_hw_free(fe, stream);
2217         if (err < 0)
2218                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2219
2220         err = dpcm_be_dai_shutdown(fe, stream);
2221         if (err < 0)
2222                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2223
2224         /* run the stream event for each BE */
2225         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2226
2227         return 0;
2228 }
2229
2230 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2231 {
2232         struct snd_pcm_substream *substream =
2233                 snd_soc_dpcm_get_substream(fe, stream);
2234         struct snd_soc_dpcm *dpcm;
2235         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2236         int ret;
2237
2238         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2239                         stream ? "capture" : "playback", fe->dai_link->name);
2240
2241         /* Only start the BE if the FE is ready */
2242         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2243                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2244                 return -EINVAL;
2245
2246         /* startup must always be called for new BEs */
2247         ret = dpcm_be_dai_startup(fe, stream);
2248         if (ret < 0)
2249                 goto disconnect;
2250
2251         /* keep going if FE state is > open */
2252         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2253                 return 0;
2254
2255         ret = dpcm_be_dai_hw_params(fe, stream);
2256         if (ret < 0)
2257                 goto close;
2258
2259         /* keep going if FE state is > hw_params */
2260         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2261                 return 0;
2262
2263
2264         ret = dpcm_be_dai_prepare(fe, stream);
2265         if (ret < 0)
2266                 goto hw_free;
2267
2268         /* run the stream event for each BE */
2269         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2270
2271         /* keep going if FE state is > prepare */
2272         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2273                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2274                 return 0;
2275
2276         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2277                 /* call trigger on the frontend - FE takes care of all BE triggers */
2278                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2279                                 fe->dai_link->name);
2280
2281                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2282                 if (ret < 0) {
2283                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2284                         goto hw_free;
2285                 }
2286         } else {
2287                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2288                         fe->dai_link->name);
2289
2290                 ret = dpcm_be_dai_trigger(fe, stream,
2291                                         SNDRV_PCM_TRIGGER_START);
2292                 if (ret < 0) {
2293                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2294                         goto hw_free;
2295                 }
2296         }
2297
2298         return 0;
2299
2300 hw_free:
2301         dpcm_be_dai_hw_free(fe, stream);
2302 close:
2303         dpcm_be_dai_shutdown(fe, stream);
2304 disconnect:
2305         /* disconnect any non started BEs */
2306         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2307                 struct snd_soc_pcm_runtime *be = dpcm->be;
2308                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2309                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2310         }
2311
2312         return ret;
2313 }
2314
2315 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2316 {
2317         int ret;
2318
2319         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2320         ret = dpcm_run_update_startup(fe, stream);
2321         if (ret < 0)
2322                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2323         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2324
2325         return ret;
2326 }
2327
2328 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2329 {
2330         int ret;
2331
2332         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2333         ret = dpcm_run_update_shutdown(fe, stream);
2334         if (ret < 0)
2335                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2336         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2337
2338         return ret;
2339 }
2340
2341 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2342  * any DAI links.
2343  */
2344 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2345 {
2346         int i, old, new, paths;
2347
2348         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2349         for (i = 0; i < card->num_rtd; i++) {
2350                 struct snd_soc_dapm_widget_list *list;
2351                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
2352
2353                 /* make sure link is FE */
2354                 if (!fe->dai_link->dynamic)
2355                         continue;
2356
2357                 /* only check active links */
2358                 if (!fe->cpu_dai->active)
2359                         continue;
2360
2361                 /* DAPM sync will call this to update DSP paths */
2362                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2363                         fe->dai_link->name);
2364
2365                 /* skip if FE doesn't have playback capability */
2366                 if (!fe->cpu_dai->driver->playback.channels_min
2367                     || !fe->codec_dai->driver->playback.channels_min)
2368                         goto capture;
2369
2370                 /* skip if FE isn't currently playing */
2371                 if (!fe->cpu_dai->playback_active
2372                     || !fe->codec_dai->playback_active)
2373                         goto capture;
2374
2375                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2376                 if (paths < 0) {
2377                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2378                                         fe->dai_link->name,  "playback");
2379                         mutex_unlock(&card->mutex);
2380                         return paths;
2381                 }
2382
2383                 /* update any new playback paths */
2384                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2385                 if (new) {
2386                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2387                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2388                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2389                 }
2390
2391                 /* update any old playback paths */
2392                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2393                 if (old) {
2394                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2395                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2396                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2397                 }
2398
2399                 dpcm_path_put(&list);
2400 capture:
2401                 /* skip if FE doesn't have capture capability */
2402                 if (!fe->cpu_dai->driver->capture.channels_min
2403                     || !fe->codec_dai->driver->capture.channels_min)
2404                         continue;
2405
2406                 /* skip if FE isn't currently capturing */
2407                 if (!fe->cpu_dai->capture_active
2408                     || !fe->codec_dai->capture_active)
2409                         continue;
2410
2411                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2412                 if (paths < 0) {
2413                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2414                                         fe->dai_link->name,  "capture");
2415                         mutex_unlock(&card->mutex);
2416                         return paths;
2417                 }
2418
2419                 /* update any new capture paths */
2420                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2421                 if (new) {
2422                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2423                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2424                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2425                 }
2426
2427                 /* update any old capture paths */
2428                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2429                 if (old) {
2430                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2431                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2432                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2433                 }
2434
2435                 dpcm_path_put(&list);
2436         }
2437
2438         mutex_unlock(&card->mutex);
2439         return 0;
2440 }
2441 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2442 {
2443         struct snd_soc_dpcm *dpcm;
2444         struct list_head *clients =
2445                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2446
2447         list_for_each_entry(dpcm, clients, list_be) {
2448
2449                 struct snd_soc_pcm_runtime *be = dpcm->be;
2450                 int i;
2451
2452                 if (be->dai_link->ignore_suspend)
2453                         continue;
2454
2455                 for (i = 0; i < be->num_codecs; i++) {
2456                         struct snd_soc_dai *dai = be->codec_dais[i];
2457                         struct snd_soc_dai_driver *drv = dai->driver;
2458
2459                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2460                                          be->dai_link->name);
2461
2462                         if (drv->ops && drv->ops->digital_mute &&
2463                                                         dai->playback_active)
2464                                 drv->ops->digital_mute(dai, mute);
2465                 }
2466         }
2467
2468         return 0;
2469 }
2470
2471 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2472 {
2473         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2474         struct snd_soc_dpcm *dpcm;
2475         struct snd_soc_dapm_widget_list *list;
2476         int ret;
2477         int stream = fe_substream->stream;
2478
2479         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2480         fe->dpcm[stream].runtime = fe_substream->runtime;
2481
2482         ret = dpcm_path_get(fe, stream, &list);
2483         if (ret < 0) {
2484                 mutex_unlock(&fe->card->mutex);
2485                 return ret;
2486         } else if (ret == 0) {
2487                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2488                         fe->dai_link->name, stream ? "capture" : "playback");
2489         }
2490
2491         /* calculate valid and active FE <-> BE dpcms */
2492         dpcm_process_paths(fe, stream, &list, 1);
2493
2494         ret = dpcm_fe_dai_startup(fe_substream);
2495         if (ret < 0) {
2496                 /* clean up all links */
2497                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2498                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2499
2500                 dpcm_be_disconnect(fe, stream);
2501                 fe->dpcm[stream].runtime = NULL;
2502         }
2503
2504         dpcm_clear_pending_state(fe, stream);
2505         dpcm_path_put(&list);
2506         mutex_unlock(&fe->card->mutex);
2507         return ret;
2508 }
2509
2510 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2511 {
2512         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2513         struct snd_soc_dpcm *dpcm;
2514         int stream = fe_substream->stream, ret;
2515
2516         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2517         ret = dpcm_fe_dai_shutdown(fe_substream);
2518
2519         /* mark FE's links ready to prune */
2520         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2521                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2522
2523         dpcm_be_disconnect(fe, stream);
2524
2525         fe->dpcm[stream].runtime = NULL;
2526         mutex_unlock(&fe->card->mutex);
2527         return ret;
2528 }
2529
2530 /* create a new pcm */
2531 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2532 {
2533         struct snd_soc_platform *platform = rtd->platform;
2534         struct snd_soc_dai *codec_dai;
2535         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2536         struct snd_pcm *pcm;
2537         char new_name[64];
2538         int ret = 0, playback = 0, capture = 0;
2539         int i;
2540
2541         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2542                 playback = rtd->dai_link->dpcm_playback;
2543                 capture = rtd->dai_link->dpcm_capture;
2544         } else {
2545                 for (i = 0; i < rtd->num_codecs; i++) {
2546                         codec_dai = rtd->codec_dais[i];
2547                         if (codec_dai->driver->playback.channels_min)
2548                                 playback = 1;
2549                         if (codec_dai->driver->capture.channels_min)
2550                                 capture = 1;
2551                 }
2552
2553                 capture = capture && cpu_dai->driver->capture.channels_min;
2554                 playback = playback && cpu_dai->driver->playback.channels_min;
2555         }
2556
2557         if (rtd->dai_link->playback_only) {
2558                 playback = 1;
2559                 capture = 0;
2560         }
2561
2562         if (rtd->dai_link->capture_only) {
2563                 playback = 0;
2564                 capture = 1;
2565         }
2566
2567         /* create the PCM */
2568         if (rtd->dai_link->no_pcm) {
2569                 snprintf(new_name, sizeof(new_name), "(%s)",
2570                         rtd->dai_link->stream_name);
2571
2572                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2573                                 playback, capture, &pcm);
2574         } else {
2575                 if (rtd->dai_link->dynamic)
2576                         snprintf(new_name, sizeof(new_name), "%s (*)",
2577                                 rtd->dai_link->stream_name);
2578                 else
2579                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2580                                 rtd->dai_link->stream_name,
2581                                 (rtd->num_codecs > 1) ?
2582                                 "multicodec" : rtd->codec_dai->name, num);
2583
2584                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2585                         capture, &pcm);
2586         }
2587         if (ret < 0) {
2588                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2589                         rtd->dai_link->name);
2590                 return ret;
2591         }
2592         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2593
2594         /* DAPM dai link stream work */
2595         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2596
2597         pcm->nonatomic = rtd->dai_link->nonatomic;
2598         rtd->pcm = pcm;
2599         pcm->private_data = rtd;
2600
2601         if (rtd->dai_link->no_pcm) {
2602                 if (playback)
2603                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2604                 if (capture)
2605                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2606                 goto out;
2607         }
2608
2609         /* ASoC PCM operations */
2610         if (rtd->dai_link->dynamic) {
2611                 rtd->ops.open           = dpcm_fe_dai_open;
2612                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2613                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2614                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2615                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2616                 rtd->ops.close          = dpcm_fe_dai_close;
2617                 rtd->ops.pointer        = soc_pcm_pointer;
2618                 rtd->ops.ioctl          = soc_pcm_ioctl;
2619         } else {
2620                 rtd->ops.open           = soc_pcm_open;
2621                 rtd->ops.hw_params      = soc_pcm_hw_params;
2622                 rtd->ops.prepare        = soc_pcm_prepare;
2623                 rtd->ops.trigger        = soc_pcm_trigger;
2624                 rtd->ops.hw_free        = soc_pcm_hw_free;
2625                 rtd->ops.close          = soc_pcm_close;
2626                 rtd->ops.pointer        = soc_pcm_pointer;
2627                 rtd->ops.ioctl          = soc_pcm_ioctl;
2628         }
2629
2630         if (platform->driver->ops) {
2631                 rtd->ops.ack            = platform->driver->ops->ack;
2632                 rtd->ops.copy           = platform->driver->ops->copy;
2633                 rtd->ops.silence        = platform->driver->ops->silence;
2634                 rtd->ops.page           = platform->driver->ops->page;
2635                 rtd->ops.mmap           = platform->driver->ops->mmap;
2636         }
2637
2638         if (playback)
2639                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2640
2641         if (capture)
2642                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2643
2644         if (platform->driver->pcm_new) {
2645                 ret = platform->driver->pcm_new(rtd);
2646                 if (ret < 0) {
2647                         dev_err(platform->dev,
2648                                 "ASoC: pcm constructor failed: %d\n",
2649                                 ret);
2650                         return ret;
2651                 }
2652         }
2653
2654         pcm->private_free = platform->driver->pcm_free;
2655 out:
2656         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2657                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2658                  cpu_dai->name);
2659         return ret;
2660 }
2661
2662 /* is the current PCM operation for this FE ? */
2663 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2664 {
2665         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2666                 return 1;
2667         return 0;
2668 }
2669 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2670
2671 /* is the current PCM operation for this BE ? */
2672 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2673                 struct snd_soc_pcm_runtime *be, int stream)
2674 {
2675         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2676            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2677                   be->dpcm[stream].runtime_update))
2678                 return 1;
2679         return 0;
2680 }
2681 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2682
2683 /* get the substream for this BE */
2684 struct snd_pcm_substream *
2685         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2686 {
2687         return be->pcm->streams[stream].substream;
2688 }
2689 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2690
2691 /* get the BE runtime state */
2692 enum snd_soc_dpcm_state
2693         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2694 {
2695         return be->dpcm[stream].state;
2696 }
2697 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2698
2699 /* set the BE runtime state */
2700 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2701                 int stream, enum snd_soc_dpcm_state state)
2702 {
2703         be->dpcm[stream].state = state;
2704 }
2705 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2706
2707 /*
2708  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2709  * are not running, paused or suspended for the specified stream direction.
2710  */
2711 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2712                 struct snd_soc_pcm_runtime *be, int stream)
2713 {
2714         struct snd_soc_dpcm *dpcm;
2715         int state;
2716
2717         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2718
2719                 if (dpcm->fe == fe)
2720                         continue;
2721
2722                 state = dpcm->fe->dpcm[stream].state;
2723                 if (state == SND_SOC_DPCM_STATE_START ||
2724                         state == SND_SOC_DPCM_STATE_PAUSED ||
2725                         state == SND_SOC_DPCM_STATE_SUSPEND)
2726                         return 0;
2727         }
2728
2729         /* it's safe to free/stop this BE DAI */
2730         return 1;
2731 }
2732 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2733
2734 /*
2735  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2736  * running, paused or suspended for the specified stream direction.
2737  */
2738 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2739                 struct snd_soc_pcm_runtime *be, int stream)
2740 {
2741         struct snd_soc_dpcm *dpcm;
2742         int state;
2743
2744         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2745
2746                 if (dpcm->fe == fe)
2747                         continue;
2748
2749                 state = dpcm->fe->dpcm[stream].state;
2750                 if (state == SND_SOC_DPCM_STATE_START ||
2751                         state == SND_SOC_DPCM_STATE_PAUSED ||
2752                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2753                         state == SND_SOC_DPCM_STATE_PREPARE)
2754                         return 0;
2755         }
2756
2757         /* it's safe to change hw_params */
2758         return 1;
2759 }
2760 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2761
2762 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2763                 int cmd, struct snd_soc_platform *platform)
2764 {
2765         if (platform->driver->ops && platform->driver->ops->trigger)
2766                 return platform->driver->ops->trigger(substream, cmd);
2767         return 0;
2768 }
2769 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2770
2771 #ifdef CONFIG_DEBUG_FS
2772 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2773 {
2774         switch (state) {
2775         case SND_SOC_DPCM_STATE_NEW:
2776                 return "new";
2777         case SND_SOC_DPCM_STATE_OPEN:
2778                 return "open";
2779         case SND_SOC_DPCM_STATE_HW_PARAMS:
2780                 return "hw_params";
2781         case SND_SOC_DPCM_STATE_PREPARE:
2782                 return "prepare";
2783         case SND_SOC_DPCM_STATE_START:
2784                 return "start";
2785         case SND_SOC_DPCM_STATE_STOP:
2786                 return "stop";
2787         case SND_SOC_DPCM_STATE_SUSPEND:
2788                 return "suspend";
2789         case SND_SOC_DPCM_STATE_PAUSED:
2790                 return "paused";
2791         case SND_SOC_DPCM_STATE_HW_FREE:
2792                 return "hw_free";
2793         case SND_SOC_DPCM_STATE_CLOSE:
2794                 return "close";
2795         }
2796
2797         return "unknown";
2798 }
2799
2800 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2801                                 int stream, char *buf, size_t size)
2802 {
2803         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2804         struct snd_soc_dpcm *dpcm;
2805         ssize_t offset = 0;
2806
2807         /* FE state */
2808         offset += snprintf(buf + offset, size - offset,
2809                         "[%s - %s]\n", fe->dai_link->name,
2810                         stream ? "Capture" : "Playback");
2811
2812         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2813                         dpcm_state_string(fe->dpcm[stream].state));
2814
2815         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2816             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2817                 offset += snprintf(buf + offset, size - offset,
2818                                 "Hardware Params: "
2819                                 "Format = %s, Channels = %d, Rate = %d\n",
2820                                 snd_pcm_format_name(params_format(params)),
2821                                 params_channels(params),
2822                                 params_rate(params));
2823
2824         /* BEs state */
2825         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2826
2827         if (list_empty(&fe->dpcm[stream].be_clients)) {
2828                 offset += snprintf(buf + offset, size - offset,
2829                                 " No active DSP links\n");
2830                 goto out;
2831         }
2832
2833         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2834                 struct snd_soc_pcm_runtime *be = dpcm->be;
2835                 params = &dpcm->hw_params;
2836
2837                 offset += snprintf(buf + offset, size - offset,
2838                                 "- %s\n", be->dai_link->name);
2839
2840                 offset += snprintf(buf + offset, size - offset,
2841                                 "   State: %s\n",
2842                                 dpcm_state_string(be->dpcm[stream].state));
2843
2844                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2845                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2846                         offset += snprintf(buf + offset, size - offset,
2847                                 "   Hardware Params: "
2848                                 "Format = %s, Channels = %d, Rate = %d\n",
2849                                 snd_pcm_format_name(params_format(params)),
2850                                 params_channels(params),
2851                                 params_rate(params));
2852         }
2853
2854 out:
2855         return offset;
2856 }
2857
2858 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2859                                 size_t count, loff_t *ppos)
2860 {
2861         struct snd_soc_pcm_runtime *fe = file->private_data;
2862         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2863         char *buf;
2864
2865         buf = kmalloc(out_count, GFP_KERNEL);
2866         if (!buf)
2867                 return -ENOMEM;
2868
2869         if (fe->cpu_dai->driver->playback.channels_min)
2870                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2871                                         buf + offset, out_count - offset);
2872
2873         if (fe->cpu_dai->driver->capture.channels_min)
2874                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2875                                         buf + offset, out_count - offset);
2876
2877         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2878
2879         kfree(buf);
2880         return ret;
2881 }
2882
2883 static const struct file_operations dpcm_state_fops = {
2884         .open = simple_open,
2885         .read = dpcm_state_read_file,
2886         .llseek = default_llseek,
2887 };
2888
2889 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2890 {
2891         if (!rtd->dai_link)
2892                 return;
2893
2894         if (!rtd->card->debugfs_card_root)
2895                 return;
2896
2897         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2898                         rtd->card->debugfs_card_root);
2899         if (!rtd->debugfs_dpcm_root) {
2900                 dev_dbg(rtd->dev,
2901                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2902                          rtd->dai_link->name);
2903                 return;
2904         }
2905
2906         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2907                                                 rtd->debugfs_dpcm_root,
2908                                                 rtd, &dpcm_state_fops);
2909 }
2910 #endif