sound/soc/soc-pcm.c

   1 /*
   2  * soc-pcm.c  --  ALSA SoC PCM
   3  *
   4  * Copyright 2005 Wolfson Microelectronics PLC.
   5  * Copyright 2005 Openedhand Ltd.
   6  * Copyright (C) 2010 Slimlogic Ltd.
   7  * Copyright (C) 2010 Texas Instruments Inc.
   8  *
   9  * Authors: Liam Girdwood <lrg@ti.com>
  10  *          Mark Brown <broonie@opensource.wolfsonmicro.com>
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/pinctrl/consumer.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/slab.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/export.h>
  27 #include <linux/debugfs.h>
  28 #include <sound/core.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/soc.h>
  32 #include <sound/soc-dpcm.h>
  33 #include <sound/initval.h>
  34
  35 #define DPCM_MAX_BE_USERS       8
  36
  37 /*
  38  * snd_soc_dai_stream_valid() - check if a DAI supports the given stream
  39  *
  40  * Returns true if the DAI supports the indicated stream type.
  41  */
  42 static bool snd_soc_dai_stream_valid(struct snd_soc_dai *dai, int stream)
  43 {
  44         struct snd_soc_pcm_stream *codec_stream;
  45
  46         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
  47                 codec_stream = &dai->driver->playback;
  48         else
  49                 codec_stream = &dai->driver->capture;
  50
  51         /* If the codec specifies any rate at all, it supports the stream. */
  52         return codec_stream->rates;
  53 }
  54
  55 /**
  56  * snd_soc_runtime_activate() - Increment active count for PCM runtime components
  57  * @rtd: ASoC PCM runtime that is activated
  58  * @stream: Direction of the PCM stream
  59  *
  60  * Increments the active count for all the DAIs and components attached to a PCM
  61  * runtime. Should typically be called when a stream is opened.
  62  *
  63  * Must be called with the rtd->pcm_mutex being held
  64  */
  65 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
  66 {
  67         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  68         int i;
  69
  70         lockdep_assert_held(&rtd->pcm_mutex);
  71
  72         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  73                 cpu_dai->playback_active++;
  74                 for (i = 0; i < rtd->num_codecs; i++)
  75                         rtd->codec_dais[i]->playback_active++;
  76         } else {
  77                 cpu_dai->capture_active++;
  78                 for (i = 0; i < rtd->num_codecs; i++)
  79                         rtd->codec_dais[i]->capture_active++;
  80         }
  81
  82         cpu_dai->active++;
  83         cpu_dai->component->active++;
  84         for (i = 0; i < rtd->num_codecs; i++) {
  85                 rtd->codec_dais[i]->active++;
  86                 rtd->codec_dais[i]->component->active++;
  87         }
  88 }
  89
  90 /**
  91  * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
  92  * @rtd: ASoC PCM runtime that is deactivated
  93  * @stream: Direction of the PCM stream
  94  *
  95  * Decrements the active count for all the DAIs and components attached to a PCM
  96  * runtime. Should typically be called when a stream is closed.
  97  *
  98  * Must be called with the rtd->pcm_mutex being held
  99  */
 100 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
 101 {
 102         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 103         int i;
 104
 105         lockdep_assert_held(&rtd->pcm_mutex);
 106
 107         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 108                 cpu_dai->playback_active--;
 109                 for (i = 0; i < rtd->num_codecs; i++)
 110                         rtd->codec_dais[i]->playback_active--;
 111         } else {
 112                 cpu_dai->capture_active--;
 113                 for (i = 0; i < rtd->num_codecs; i++)
 114                         rtd->codec_dais[i]->capture_active--;
 115         }
 116
 117         cpu_dai->active--;
 118         cpu_dai->component->active--;
 119         for (i = 0; i < rtd->num_codecs; i++) {
 120                 rtd->codec_dais[i]->component->active--;
 121                 rtd->codec_dais[i]->active--;
 122         }
 123 }
 124
 125 /**
 126  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 127  * @rtd: The ASoC PCM runtime that should be checked.
 128  *
 129  * This function checks whether the power down delay should be ignored for a
 130  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 131  * been configured to ignore the delay, or if none of the components benefits
 132  * from having the delay.
 133  */
 134 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 135 {
 136         int i;
 137         bool ignore = true;
 138
 139         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 140                 return true;
 141
 142         for (i = 0; i < rtd->num_codecs; i++)
 143                 ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time;
 144
 145         return rtd->cpu_dai->component->ignore_pmdown_time && ignore;
 146 }
 147
 148 /**
 149  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 150  * @substream: the pcm substream
 151  * @hw: the hardware parameters
 152  *
 153  * Sets the substream runtime hardware parameters.
 154  */
 155 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 156         const struct snd_pcm_hardware *hw)
 157 {
 158         struct snd_pcm_runtime *runtime = substream->runtime;
 159         runtime->hw.info = hw->info;
 160         runtime->hw.formats = hw->formats;
 161         runtime->hw.period_bytes_min = hw->period_bytes_min;
 162         runtime->hw.period_bytes_max = hw->period_bytes_max;
 163         runtime->hw.periods_min = hw->periods_min;
 164         runtime->hw.periods_max = hw->periods_max;
 165         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
 166         runtime->hw.fifo_size = hw->fifo_size;
 167         return 0;
 168 }
 169 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 170
 171 /* DPCM stream event, send event to FE and all active BEs. */
 172 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 173         int event)
 174 {
 175         struct snd_soc_dpcm *dpcm;
 176
 177         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
 178
 179                 struct snd_soc_pcm_runtime *be = dpcm->be;
 180
 181                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 182                                 be->dai_link->name, event, dir);
 183
 184                 snd_soc_dapm_stream_event(be, dir, event);
 185         }
 186
 187         snd_soc_dapm_stream_event(fe, dir, event);
 188
 189         return 0;
 190 }
 191
 192 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 193                                         struct snd_soc_dai *soc_dai)
 194 {
 195         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 196         int ret;
 197
 198         if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
 199                                 rtd->dai_link->symmetric_rates)) {
 200                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
 201                                 soc_dai->rate);
 202
 203                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 204                                                 SNDRV_PCM_HW_PARAM_RATE,
 205                                                 soc_dai->rate);
 206                 if (ret < 0) {
 207                         dev_err(soc_dai->dev,
 208                                 "ASoC: Unable to apply rate constraint: %d\n",
 209                                 ret);
 210                         return ret;
 211                 }
 212         }
 213
 214         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
 215                                 rtd->dai_link->symmetric_channels)) {
 216                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
 217                                 soc_dai->channels);
 218
 219                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 220                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
 221                                                 soc_dai->channels);
 222                 if (ret < 0) {
 223                         dev_err(soc_dai->dev,
 224                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
 225                                 ret);
 226                         return ret;
 227                 }
 228         }
 229
 230         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
 231                                 rtd->dai_link->symmetric_samplebits)) {
 232                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
 233                                 soc_dai->sample_bits);
 234
 235                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 236                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
 237                                                 soc_dai->sample_bits);
 238                 if (ret < 0) {
 239                         dev_err(soc_dai->dev,
 240                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
 241                                 ret);
 242                         return ret;
 243                 }
 244         }
 245
 246         return 0;
 247 }
 248
 249 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 250                                 struct snd_pcm_hw_params *params)
 251 {
 252         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 253         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 254         unsigned int rate, channels, sample_bits, symmetry, i;
 255
 256         rate = params_rate(params);
 257         channels = params_channels(params);
 258         sample_bits = snd_pcm_format_physical_width(params_format(params));
 259
 260         /* reject unmatched parameters when applying symmetry */
 261         symmetry = cpu_dai->driver->symmetric_rates ||
 262                 rtd->dai_link->symmetric_rates;
 263
 264         for (i = 0; i < rtd->num_codecs; i++)
 265                 symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;
 266
 267         if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
 268                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
 269                                 cpu_dai->rate, rate);
 270                 return -EINVAL;
 271         }
 272
 273         symmetry = cpu_dai->driver->symmetric_channels ||
 274                 rtd->dai_link->symmetric_channels;
 275
 276         for (i = 0; i < rtd->num_codecs; i++)
 277                 symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;
 278
 279         if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
 280                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
 281                                 cpu_dai->channels, channels);
 282                 return -EINVAL;
 283         }
 284
 285         symmetry = cpu_dai->driver->symmetric_samplebits ||
 286                 rtd->dai_link->symmetric_samplebits;
 287
 288         for (i = 0; i < rtd->num_codecs; i++)
 289                 symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;
 290
 291         if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
 292                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
 293                                 cpu_dai->sample_bits, sample_bits);
 294                 return -EINVAL;
 295         }
 296
 297         return 0;
 298 }
 299
 300 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
 301 {
 302         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 303         struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
 304         struct snd_soc_dai_link *link = rtd->dai_link;
 305         unsigned int symmetry, i;
 306
 307         symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
 308                 cpu_driver->symmetric_channels || link->symmetric_channels ||
 309                 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
 310
 311         for (i = 0; i < rtd->num_codecs; i++)
 312                 symmetry = symmetry ||
 313                         rtd->codec_dais[i]->driver->symmetric_rates ||
 314                         rtd->codec_dais[i]->driver->symmetric_channels ||
 315                         rtd->codec_dais[i]->driver->symmetric_samplebits;
 316
 317         return symmetry;
 318 }
 319
 320 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 321 {
 322         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 323         int ret;
 324
 325         if (!bits)
 326                 return;
 327
 328         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 329         if (ret != 0)
 330                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 331                                  bits, ret);
 332 }
 333
 334 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 335 {
 336         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 337         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 338         struct snd_soc_dai *codec_dai;
 339         int i;
 340         unsigned int bits = 0, cpu_bits;
 341
 342         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 343                 for (i = 0; i < rtd->num_codecs; i++) {
 344                         codec_dai = rtd->codec_dais[i];
 345                         if (codec_dai->driver->playback.sig_bits == 0) {
 346                                 bits = 0;
 347                                 break;
 348                         }
 349                         bits = max(codec_dai->driver->playback.sig_bits, bits);
 350                 }
 351                 cpu_bits = cpu_dai->driver->playback.sig_bits;
 352         } else {
 353                 for (i = 0; i < rtd->num_codecs; i++) {
 354                         codec_dai = rtd->codec_dais[i];
 355                         if (codec_dai->driver->capture.sig_bits == 0) {
 356                                 bits = 0;
 357                                 break;
 358                         }
 359                         bits = max(codec_dai->driver->capture.sig_bits, bits);
 360                 }
 361                 cpu_bits = cpu_dai->driver->capture.sig_bits;
 362         }
 363
 364         soc_pcm_set_msb(substream, bits);
 365         soc_pcm_set_msb(substream, cpu_bits);
 366 }
 367
 368 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 369 {
 370         struct snd_pcm_runtime *runtime = substream->runtime;
 371         struct snd_pcm_hardware *hw = &runtime->hw;
 372         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 373         struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
 374         struct snd_soc_dai_driver *codec_dai_drv;
 375         struct snd_soc_pcm_stream *codec_stream;
 376         struct snd_soc_pcm_stream *cpu_stream;
 377         unsigned int chan_min = 0, chan_max = UINT_MAX;
 378         unsigned int rate_min = 0, rate_max = UINT_MAX;
 379         unsigned int rates = UINT_MAX;
 380         u64 formats = ULLONG_MAX;
 381         int i;
 382
 383         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 384                 cpu_stream = &cpu_dai_drv->playback;
 385         else
 386                 cpu_stream = &cpu_dai_drv->capture;
 387
 388         /* first calculate min/max only for CODECs in the DAI link */
 389         for (i = 0; i < rtd->num_codecs; i++) {
 390
 391                 /*
 392                  * Skip CODECs which don't support the current stream type.
 393                  * Otherwise, since the rate, channel, and format values will
 394                  * zero in that case, we would have no usable settings left,
 395                  * causing the resulting setup to fail.
 396                  * At least one CODEC should match, otherwise we should have
 397                  * bailed out on a higher level, since there would be no
 398                  * CODEC to support the transfer direction in that case.
 399                  */
 400                 if (!snd_soc_dai_stream_valid(rtd->codec_dais[i],
 401                                               substream->stream))
 402                         continue;
 403
 404                 codec_dai_drv = rtd->codec_dais[i]->driver;
 405                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 406                         codec_stream = &codec_dai_drv->playback;
 407                 else
 408                         codec_stream = &codec_dai_drv->capture;
 409                 chan_min = max(chan_min, codec_stream->channels_min);
 410                 chan_max = min(chan_max, codec_stream->channels_max);
 411                 rate_min = max(rate_min, codec_stream->rate_min);
 412                 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
 413                 formats &= codec_stream->formats;
 414                 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
 415         }
 416
 417         /*
 418          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 419          * connected to a single CPU DAI, use CPU DAI's directly and let
 420          * channel allocation be fixed up later
 421          */
 422         if (rtd->num_codecs > 1) {
 423                 chan_min = cpu_stream->channels_min;
 424                 chan_max = cpu_stream->channels_max;
 425         }
 426
 427         hw->channels_min = max(chan_min, cpu_stream->channels_min);
 428         hw->channels_max = min(chan_max, cpu_stream->channels_max);
 429         if (hw->formats)
 430                 hw->formats &= formats & cpu_stream->formats;
 431         else
 432                 hw->formats = formats & cpu_stream->formats;
 433         hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
 434
 435         snd_pcm_limit_hw_rates(runtime);
 436
 437         hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
 438         hw->rate_min = max(hw->rate_min, rate_min);
 439         hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
 440         hw->rate_max = min_not_zero(hw->rate_max, rate_max);
 441 }
 442
 443 /*
 444  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 445  * then initialized and any private data can be allocated. This also calls
 446  * startup for the cpu DAI, platform, machine and codec DAI.
 447  */
 448 static int soc_pcm_open(struct snd_pcm_substream *substream)
 449 {
 450         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 451         struct snd_pcm_runtime *runtime = substream->runtime;
 452         struct snd_soc_platform *platform = rtd->platform;
 453         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 454         struct snd_soc_dai *codec_dai;
 455         const char *codec_dai_name = "multicodec";
 456         int i, ret = 0;
 457
 458         pinctrl_pm_select_default_state(cpu_dai->dev);
 459         for (i = 0; i < rtd->num_codecs; i++)
 460                 pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
 461         pm_runtime_get_sync(cpu_dai->dev);
 462         for (i = 0; i < rtd->num_codecs; i++)
 463                 pm_runtime_get_sync(rtd->codec_dais[i]->dev);
 464         pm_runtime_get_sync(platform->dev);
 465
 466         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 467
 468         /* startup the audio subsystem */
 469         if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
 470                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 471                 if (ret < 0) {
 472                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 473                                 " %s: %d\n", cpu_dai->name, ret);
 474                         goto out;
 475                 }
 476         }
 477
 478         if (platform->driver->ops && platform->driver->ops->open) {
 479                 ret = platform->driver->ops->open(substream);
 480                 if (ret < 0) {
 481                         dev_err(platform->dev, "ASoC: can't open platform"
 482                                 " %s: %d\n", platform->component.name, ret);
 483                         goto platform_err;
 484                 }
 485         }
 486
 487         for (i = 0; i < rtd->num_codecs; i++) {
 488                 codec_dai = rtd->codec_dais[i];
 489                 if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
 490                         ret = codec_dai->driver->ops->startup(substream,
 491                                                               codec_dai);
 492                         if (ret < 0) {
 493                                 dev_err(codec_dai->dev,
 494                                         "ASoC: can't open codec %s: %d\n",
 495                                         codec_dai->name, ret);
 496                                 goto codec_dai_err;
 497                         }
 498                 }
 499
 500                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 501                         codec_dai->tx_mask = 0;
 502                 else
 503                         codec_dai->rx_mask = 0;
 504         }
 505
 506         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 507                 ret = rtd->dai_link->ops->startup(substream);
 508                 if (ret < 0) {
 509                         pr_err("ASoC: %s startup failed: %d\n",
 510                                rtd->dai_link->name, ret);
 511                         goto machine_err;
 512                 }
 513         }
 514
 515         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 516         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 517                 goto dynamic;
 518
 519         /* Check that the codec and cpu DAIs are compatible */
 520         soc_pcm_init_runtime_hw(substream);
 521
 522         if (rtd->num_codecs == 1)
 523                 codec_dai_name = rtd->codec_dai->name;
 524
 525         if (soc_pcm_has_symmetry(substream))
 526                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 527
 528         ret = -EINVAL;
 529         if (!runtime->hw.rates) {
 530                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 531                         codec_dai_name, cpu_dai->name);
 532                 goto config_err;
 533         }
 534         if (!runtime->hw.formats) {
 535                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 536                         codec_dai_name, cpu_dai->name);
 537                 goto config_err;
 538         }
 539         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 540             runtime->hw.channels_min > runtime->hw.channels_max) {
 541                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 542                                 codec_dai_name, cpu_dai->name);
 543                 goto config_err;
 544         }
 545
 546         soc_pcm_apply_msb(substream);
 547
 548         /* Symmetry only applies if we've already got an active stream. */
 549         if (cpu_dai->active) {
 550                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 551                 if (ret != 0)
 552                         goto config_err;
 553         }
 554
 555         for (i = 0; i < rtd->num_codecs; i++) {
 556                 if (rtd->codec_dais[i]->active) {
 557                         ret = soc_pcm_apply_symmetry(substream,
 558                                                      rtd->codec_dais[i]);
 559                         if (ret != 0)
 560                                 goto config_err;
 561                 }
 562         }
 563
 564         pr_debug("ASoC: %s <-> %s info:\n",
 565                         codec_dai_name, cpu_dai->name);
 566         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 567         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 568                  runtime->hw.channels_max);
 569         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 570                  runtime->hw.rate_max);
 571
 572 dynamic:
 573
 574         snd_soc_runtime_activate(rtd, substream->stream);
 575
 576         mutex_unlock(&rtd->pcm_mutex);
 577         return 0;
 578
 579 config_err:
 580         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 581                 rtd->dai_link->ops->shutdown(substream);
 582
 583 machine_err:
 584         i = rtd->num_codecs;
 585
 586 codec_dai_err:
 587         while (--i >= 0) {
 588                 codec_dai = rtd->codec_dais[i];
 589                 if (codec_dai->driver->ops->shutdown)
 590                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 591         }
 592
 593         if (platform->driver->ops && platform->driver->ops->close)
 594                 platform->driver->ops->close(substream);
 595
 596 platform_err:
 597         if (cpu_dai->driver->ops->shutdown)
 598                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 599 out:
 600         mutex_unlock(&rtd->pcm_mutex);
 601
 602         pm_runtime_mark_last_busy(platform->dev);
 603         pm_runtime_put_autosuspend(platform->dev);
 604         for (i = 0; i < rtd->num_codecs; i++) {
 605                 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
 606                 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
 607         }
 608
 609         pm_runtime_mark_last_busy(cpu_dai->dev);
 610         pm_runtime_put_autosuspend(cpu_dai->dev);
 611         for (i = 0; i < rtd->num_codecs; i++) {
 612                 if (!rtd->codec_dais[i]->active)
 613                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 614         }
 615         if (!cpu_dai->active)
 616                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 617
 618         return ret;
 619 }
 620
 621 /*
 622  * Power down the audio subsystem pmdown_time msecs after close is called.
 623  * This is to ensure there are no pops or clicks in between any music tracks
 624  * due to DAPM power cycling.
 625  */
 626 static void close_delayed_work(struct work_struct *work)
 627 {
 628         struct snd_soc_pcm_runtime *rtd =
 629                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 630         struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
 631
 632         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 633
 634         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 635                  codec_dai->driver->playback.stream_name,
 636                  codec_dai->playback_active ? "active" : "inactive",
 637                  rtd->pop_wait ? "yes" : "no");
 638
 639         /* are we waiting on this codec DAI stream */
 640         if (rtd->pop_wait == 1) {
 641                 rtd->pop_wait = 0;
 642                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 643                                           SND_SOC_DAPM_STREAM_STOP);
 644         }
 645
 646         mutex_unlock(&rtd->pcm_mutex);
 647 }
 648
 649 /*
 650  * Called by ALSA when a PCM substream is closed. Private data can be
 651  * freed here. The cpu DAI, codec DAI, machine and platform are also
 652  * shutdown.
 653  */
 654 static int soc_pcm_close(struct snd_pcm_substream *substream)
 655 {
 656         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 657         struct snd_soc_platform *platform = rtd->platform;
 658         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 659         struct snd_soc_dai *codec_dai;
 660         int i;
 661
 662         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 663
 664         snd_soc_runtime_deactivate(rtd, substream->stream);
 665
 666         /* clear the corresponding DAIs rate when inactive */
 667         if (!cpu_dai->active)
 668                 cpu_dai->rate = 0;
 669
 670         for (i = 0; i < rtd->num_codecs; i++) {
 671                 codec_dai = rtd->codec_dais[i];
 672                 if (!codec_dai->active)
 673                         codec_dai->rate = 0;
 674         }
 675
 676         snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
 677
 678         if (cpu_dai->driver->ops->shutdown)
 679                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 680
 681         for (i = 0; i < rtd->num_codecs; i++) {
 682                 codec_dai = rtd->codec_dais[i];
 683                 if (codec_dai->driver->ops->shutdown)
 684                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 685         }
 686
 687         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 688                 rtd->dai_link->ops->shutdown(substream);
 689
 690         if (platform->driver->ops && platform->driver->ops->close)
 691                 platform->driver->ops->close(substream);
 692
 693         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 694                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
 695                         /* powered down playback stream now */
 696                         snd_soc_dapm_stream_event(rtd,
 697                                                   SNDRV_PCM_STREAM_PLAYBACK,
 698                                                   SND_SOC_DAPM_STREAM_STOP);
 699                 } else {
 700                         /* start delayed pop wq here for playback streams */
 701                         rtd->pop_wait = 1;
 702                         queue_delayed_work(system_power_efficient_wq,
 703                                            &rtd->delayed_work,
 704                                            msecs_to_jiffies(rtd->pmdown_time));
 705                 }
 706         } else {
 707                 /* capture streams can be powered down now */
 708                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 709                                           SND_SOC_DAPM_STREAM_STOP);
 710         }
 711
 712         mutex_unlock(&rtd->pcm_mutex);
 713
 714         pm_runtime_mark_last_busy(platform->dev);
 715         pm_runtime_put_autosuspend(platform->dev);
 716
 717         for (i = 0; i < rtd->num_codecs; i++) {
 718                 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
 719                 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
 720         }
 721
 722         pm_runtime_mark_last_busy(cpu_dai->dev);
 723         pm_runtime_put_autosuspend(cpu_dai->dev);
 724
 725         for (i = 0; i < rtd->num_codecs; i++) {
 726                 if (!rtd->codec_dais[i]->active)
 727                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 728         }
 729         if (!cpu_dai->active)
 730                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 731
 732         return 0;
 733 }
 734
 735 /*
 736  * Called by ALSA when the PCM substream is prepared, can set format, sample
 737  * rate, etc.  This function is non atomic and can be called multiple times,
 738  * it can refer to the runtime info.
 739  */
 740 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 741 {
 742         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 743         struct snd_soc_platform *platform = rtd->platform;
 744         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 745         struct snd_soc_dai *codec_dai;
 746         int i, ret = 0;
 747
 748         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 749
 750         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 751                 ret = rtd->dai_link->ops->prepare(substream);
 752                 if (ret < 0) {
 753                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 754                                 " %d\n", ret);
 755                         goto out;
 756                 }
 757         }
 758
 759         if (platform->driver->ops && platform->driver->ops->prepare) {
 760                 ret = platform->driver->ops->prepare(substream);
 761                 if (ret < 0) {
 762                         dev_err(platform->dev, "ASoC: platform prepare error:"
 763                                 " %d\n", ret);
 764                         goto out;
 765                 }
 766         }
 767
 768         for (i = 0; i < rtd->num_codecs; i++) {
 769                 codec_dai = rtd->codec_dais[i];
 770                 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
 771                         ret = codec_dai->driver->ops->prepare(substream,
 772                                                               codec_dai);
 773                         if (ret < 0) {
 774                                 dev_err(codec_dai->dev,
 775                                         "ASoC: codec DAI prepare error: %d\n",
 776                                         ret);
 777                                 goto out;
 778                         }
 779                 }
 780         }
 781
 782         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 783                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 784                 if (ret < 0) {
 785                         dev_err(cpu_dai->dev,
 786                                 "ASoC: cpu DAI prepare error: %d\n", ret);
 787                         goto out;
 788                 }
 789         }
 790
 791         /* cancel any delayed stream shutdown that is pending */
 792         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 793             rtd->pop_wait) {
 794                 rtd->pop_wait = 0;
 795                 cancel_delayed_work(&rtd->delayed_work);
 796         }
 797
 798         snd_soc_dapm_stream_event(rtd, substream->stream,
 799                         SND_SOC_DAPM_STREAM_START);
 800
 801         for (i = 0; i < rtd->num_codecs; i++)
 802                 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
 803                                          substream->stream);
 804         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
 805
 806 out:
 807         mutex_unlock(&rtd->pcm_mutex);
 808         return ret;
 809 }
 810
 811 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 812                                        unsigned int mask)
 813 {
 814         struct snd_interval *interval;
 815         int channels = hweight_long(mask);
 816
 817         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 818         interval->min = channels;
 819         interval->max = channels;
 820 }
 821
 822 int soc_dai_hw_params(struct snd_pcm_substream *substream,
 823                       struct snd_pcm_hw_params *params,
 824                       struct snd_soc_dai *dai)
 825 {
 826         int ret;
 827
 828         if (dai->driver->ops && dai->driver->ops->hw_params) {
 829                 ret = dai->driver->ops->hw_params(substream, params, dai);
 830                 if (ret < 0) {
 831                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
 832                                 dai->name, ret);
 833                         return ret;
 834                 }
 835         }
 836
 837         return 0;
 838 }
 839
 840 /*
 841  * Called by ALSA when the hardware params are set by application. This
 842  * function can also be called multiple times and can allocate buffers
 843  * (using snd_pcm_lib_* ). It's non-atomic.
 844  */
 845 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 846                                 struct snd_pcm_hw_params *params)
 847 {
 848         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 849         struct snd_soc_platform *platform = rtd->platform;
 850         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 851         int i, ret = 0;
 852
 853         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 854
 855         ret = soc_pcm_params_symmetry(substream, params);
 856         if (ret)
 857                 goto out;
 858
 859         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 860                 ret = rtd->dai_link->ops->hw_params(substream, params);
 861                 if (ret < 0) {
 862                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 863                                 " failed: %d\n", ret);
 864                         goto out;
 865                 }
 866         }
 867
 868         for (i = 0; i < rtd->num_codecs; i++) {
 869                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 870                 struct snd_pcm_hw_params codec_params;
 871
 872                 /*
 873                  * Skip CODECs which don't support the current stream type,
 874                  * the idea being that if a CODEC is not used for the currently
 875                  * set up transfer direction, it should not need to be
 876                  * configured, especially since the configuration used might
 877                  * not even be supported by that CODEC. There may be cases
 878                  * however where a CODEC needs to be set up although it is
 879                  * actually not being used for the transfer, e.g. if a
 880                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
 881                  * for the DAI link including a playback-only CODEC.
 882                  * If this becomes necessary, we will have to augment the
 883                  * machine driver setup with information on how to act, so
 884                  * we can do the right thing here.
 885                  */
 886                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 887                         continue;
 888
 889                 /* copy params for each codec */
 890                 codec_params = *params;
 891
 892                 /* fixup params based on TDM slot masks */
 893                 if (codec_dai->tx_mask)
 894                         soc_pcm_codec_params_fixup(&codec_params,
 895                                                    codec_dai->tx_mask);
 896                 if (codec_dai->rx_mask)
 897                         soc_pcm_codec_params_fixup(&codec_params,
 898                                                    codec_dai->rx_mask);
 899
 900                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
 901                 if(ret < 0)
 902                         goto codec_err;
 903
 904                 codec_dai->rate = params_rate(&codec_params);
 905                 codec_dai->channels = params_channels(&codec_params);
 906                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 907                                                 params_format(&codec_params));
 908         }
 909
 910         ret = soc_dai_hw_params(substream, params, cpu_dai);
 911         if (ret < 0)
 912                 goto interface_err;
 913
 914         if (platform->driver->ops && platform->driver->ops->hw_params) {
 915                 ret = platform->driver->ops->hw_params(substream, params);
 916                 if (ret < 0) {
 917                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 918                                platform->component.name, ret);
 919                         goto platform_err;
 920                 }
 921         }
 922
 923         /* store the parameters for each DAIs */
 924         cpu_dai->rate = params_rate(params);
 925         cpu_dai->channels = params_channels(params);
 926         cpu_dai->sample_bits =
 927                 snd_pcm_format_physical_width(params_format(params));
 928
 929 out:
 930         mutex_unlock(&rtd->pcm_mutex);
 931         return ret;
 932
 933 platform_err:
 934         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 935                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 936
 937 interface_err:
 938         i = rtd->num_codecs;
 939
 940 codec_err:
 941         while (--i >= 0) {
 942                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 943                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 944                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 945                 codec_dai->rate = 0;
 946         }
 947
 948         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 949                 rtd->dai_link->ops->hw_free(substream);
 950
 951         mutex_unlock(&rtd->pcm_mutex);
 952         return ret;
 953 }
 954
 955 /*
 956  * Frees resources allocated by hw_params, can be called multiple times
 957  */
 958 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 959 {
 960         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 961         struct snd_soc_platform *platform = rtd->platform;
 962         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 963         struct snd_soc_dai *codec_dai;
 964         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 965         int i;
 966
 967         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 968
 969         /* clear the corresponding DAIs parameters when going to be inactive */
 970         if (cpu_dai->active == 1) {
 971                 cpu_dai->rate = 0;
 972                 cpu_dai->channels = 0;
 973                 cpu_dai->sample_bits = 0;
 974         }
 975
 976         for (i = 0; i < rtd->num_codecs; i++) {
 977                 codec_dai = rtd->codec_dais[i];
 978                 if (codec_dai->active == 1) {
 979                         codec_dai->rate = 0;
 980                         codec_dai->channels = 0;
 981                         codec_dai->sample_bits = 0;
 982                 }
 983         }
 984
 985         /* apply codec digital mute */
 986         for (i = 0; i < rtd->num_codecs; i++) {
 987                 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
 988                     (!playback && rtd->codec_dais[i]->capture_active == 1))
 989                         snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
 990                                                  substream->stream);
 991         }
 992
 993         /* free any machine hw params */
 994         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 995                 rtd->dai_link->ops->hw_free(substream);
 996
 997         /* free any DMA resources */
 998         if (platform->driver->ops && platform->driver->ops->hw_free)
 999                 platform->driver->ops->hw_free(substream);
1000
1001         /* now free hw params for the DAIs  */
1002         for (i = 0; i < rtd->num_codecs; i++) {
1003                 codec_dai = rtd->codec_dais[i];
1004                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
1005                         codec_dai->driver->ops->hw_free(substream, codec_dai);
1006         }
1007
1008         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
1009                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
1010
1011         mutex_unlock(&rtd->pcm_mutex);
1012         return 0;
1013 }
1014
1015 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1016 {
1017         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1018         struct snd_soc_platform *platform = rtd->platform;
1019         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1020         struct snd_soc_dai *codec_dai;
1021         int i, ret;
1022
1023         for (i = 0; i < rtd->num_codecs; i++) {
1024                 codec_dai = rtd->codec_dais[i];
1025                 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
1026                         ret = codec_dai->driver->ops->trigger(substream,
1027                                                               cmd, codec_dai);
1028                         if (ret < 0)
1029                                 return ret;
1030                 }
1031         }
1032
1033         if (platform->driver->ops && platform->driver->ops->trigger) {
1034                 ret = platform->driver->ops->trigger(substream, cmd);
1035                 if (ret < 0)
1036                         return ret;
1037         }
1038
1039         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
1040                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
1041                 if (ret < 0)
1042                         return ret;
1043         }
1044
1045         if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1046                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1047                 if (ret < 0)
1048                         return ret;
1049         }
1050
1051         return 0;
1052 }
1053
1054 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1055                                    int cmd)
1056 {
1057         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1058         struct snd_soc_platform *platform = rtd->platform;
1059         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1060         struct snd_soc_dai *codec_dai;
1061         int i, ret;
1062
1063         for (i = 0; i < rtd->num_codecs; i++) {
1064                 codec_dai = rtd->codec_dais[i];
1065                 if (codec_dai->driver->ops &&
1066                     codec_dai->driver->ops->bespoke_trigger) {
1067                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1068                                                                 cmd, codec_dai);
1069                         if (ret < 0)
1070                                 return ret;
1071                 }
1072         }
1073
1074         if (platform->driver->bespoke_trigger) {
1075                 ret = platform->driver->bespoke_trigger(substream, cmd);
1076                 if (ret < 0)
1077                         return ret;
1078         }
1079
1080         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1081                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1082                 if (ret < 0)
1083                         return ret;
1084         }
1085         return 0;
1086 }
1087 /*
1088  * soc level wrapper for pointer callback
1089  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1090  * the runtime->delay will be updated accordingly.
1091  */
1092 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1093 {
1094         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1095         struct snd_soc_platform *platform = rtd->platform;
1096         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1097         struct snd_soc_dai *codec_dai;
1098         struct snd_pcm_runtime *runtime = substream->runtime;
1099         snd_pcm_uframes_t offset = 0;
1100         snd_pcm_sframes_t delay = 0;
1101         snd_pcm_sframes_t codec_delay = 0;
1102         int i;
1103
1104         if (platform->driver->ops && platform->driver->ops->pointer)
1105                 offset = platform->driver->ops->pointer(substream);
1106
1107         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1108                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1109
1110         for (i = 0; i < rtd->num_codecs; i++) {
1111                 codec_dai = rtd->codec_dais[i];
1112                 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1113                         codec_delay = max(codec_delay,
1114                                         codec_dai->driver->ops->delay(substream,
1115                                                                     codec_dai));
1116         }
1117         delay += codec_delay;
1118
1119         /*
1120          * None of the existing platform drivers implement delay(), so
1121          * for now the codec_dai of first multicodec entry is used
1122          */
1123         if (platform->driver->delay)
1124                 delay += platform->driver->delay(substream, rtd->codec_dais[0]);
1125
1126         runtime->delay = delay;
1127
1128         return offset;
1129 }
1130
1131 /* connect a FE and BE */
1132 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1133                 struct snd_soc_pcm_runtime *be, int stream)
1134 {
1135         struct snd_soc_dpcm *dpcm;
1136
1137         /* only add new dpcms */
1138         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1139                 if (dpcm->be == be && dpcm->fe == fe)
1140                         return 0;
1141         }
1142
1143         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1144         if (!dpcm)
1145                 return -ENOMEM;
1146
1147         dpcm->be = be;
1148         dpcm->fe = fe;
1149         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1150         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1151         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1152         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1153
1154         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1155                         stream ? "capture" : "playback",  fe->dai_link->name,
1156                         stream ? "<-" : "->", be->dai_link->name);
1157
1158 #ifdef CONFIG_DEBUG_FS
1159         if (fe->debugfs_dpcm_root)
1160                 dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1161                                 fe->debugfs_dpcm_root, &dpcm->state);
1162 #endif
1163         return 1;
1164 }
1165
1166 /* reparent a BE onto another FE */
1167 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1168                         struct snd_soc_pcm_runtime *be, int stream)
1169 {
1170         struct snd_soc_dpcm *dpcm;
1171         struct snd_pcm_substream *fe_substream, *be_substream;
1172
1173         /* reparent if BE is connected to other FEs */
1174         if (!be->dpcm[stream].users)
1175                 return;
1176
1177         be_substream = snd_soc_dpcm_get_substream(be, stream);
1178
1179         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1180                 if (dpcm->fe == fe)
1181                         continue;
1182
1183                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1184                         stream ? "capture" : "playback",
1185                         dpcm->fe->dai_link->name,
1186                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1187
1188                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1189                 be_substream->runtime = fe_substream->runtime;
1190                 break;
1191         }
1192 }
1193
1194 /* disconnect a BE and FE */
1195 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1196 {
1197         struct snd_soc_dpcm *dpcm, *d;
1198
1199         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1200                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1201                                 stream ? "capture" : "playback",
1202                                 dpcm->be->dai_link->name);
1203
1204                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1205                         continue;
1206
1207                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1208                         stream ? "capture" : "playback", fe->dai_link->name,
1209                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1210
1211                 /* BEs still alive need new FE */
1212                 dpcm_be_reparent(fe, dpcm->be, stream);
1213
1214 #ifdef CONFIG_DEBUG_FS
1215                 debugfs_remove(dpcm->debugfs_state);
1216 #endif
1217                 list_del(&dpcm->list_be);
1218                 list_del(&dpcm->list_fe);
1219                 kfree(dpcm);
1220         }
1221 }
1222
1223 /* get BE for DAI widget and stream */
1224 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1225                 struct snd_soc_dapm_widget *widget, int stream)
1226 {
1227         struct snd_soc_pcm_runtime *be;
1228         int i;
1229
1230         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1231                 list_for_each_entry(be, &card->rtd_list, list) {
1232
1233                         if (!be->dai_link->no_pcm)
1234                                 continue;
1235
1236                         if (be->cpu_dai->playback_widget == widget)
1237                                 return be;
1238
1239                         for (i = 0; i < be->num_codecs; i++) {
1240                                 struct snd_soc_dai *dai = be->codec_dais[i];
1241                                 if (dai->playback_widget == widget)
1242                                         return be;
1243                         }
1244                 }
1245         } else {
1246
1247                 list_for_each_entry(be, &card->rtd_list, list) {
1248
1249                         if (!be->dai_link->no_pcm)
1250                                 continue;
1251
1252                         if (be->cpu_dai->capture_widget == widget)
1253                                 return be;
1254
1255                         for (i = 0; i < be->num_codecs; i++) {
1256                                 struct snd_soc_dai *dai = be->codec_dais[i];
1257                                 if (dai->capture_widget == widget)
1258                                         return be;
1259                         }
1260                 }
1261         }
1262
1263         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1264                 stream ? "capture" : "playback", widget->name);
1265         return NULL;
1266 }
1267
1268 static inline struct snd_soc_dapm_widget *
1269         dai_get_widget(struct snd_soc_dai *dai, int stream)
1270 {
1271         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1272                 return dai->playback_widget;
1273         else
1274                 return dai->capture_widget;
1275 }
1276
1277 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1278                 struct snd_soc_dapm_widget *widget)
1279 {
1280         int i;
1281
1282         for (i = 0; i < list->num_widgets; i++) {
1283                 if (widget == list->widgets[i])
1284                         return 1;
1285         }
1286
1287         return 0;
1288 }
1289
1290 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1291                 enum snd_soc_dapm_direction dir)
1292 {
1293         struct snd_soc_card *card = widget->dapm->card;
1294         struct snd_soc_pcm_runtime *rtd;
1295         int i;
1296
1297         if (dir == SND_SOC_DAPM_DIR_OUT) {
1298                 list_for_each_entry(rtd, &card->rtd_list, list) {
1299                         if (!rtd->dai_link->no_pcm)
1300                                 continue;
1301
1302                         if (rtd->cpu_dai->playback_widget == widget)
1303                                 return true;
1304
1305                         for (i = 0; i < rtd->num_codecs; ++i) {
1306                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1307                                 if (dai->playback_widget == widget)
1308                                         return true;
1309                         }
1310                 }
1311         } else { /* SND_SOC_DAPM_DIR_IN */
1312                 list_for_each_entry(rtd, &card->rtd_list, list) {
1313                         if (!rtd->dai_link->no_pcm)
1314                                 continue;
1315
1316                         if (rtd->cpu_dai->capture_widget == widget)
1317                                 return true;
1318
1319                         for (i = 0; i < rtd->num_codecs; ++i) {
1320                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1321                                 if (dai->capture_widget == widget)
1322                                         return true;
1323                         }
1324                 }
1325         }
1326
1327         return false;
1328 }
1329
1330 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1331         int stream, struct snd_soc_dapm_widget_list **list)
1332 {
1333         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1334         int paths;
1335
1336         /* get number of valid DAI paths and their widgets */
1337         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1338                         dpcm_end_walk_at_be);
1339
1340         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1341                         stream ? "capture" : "playback");
1342
1343         return paths;
1344 }
1345
1346 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1347         struct snd_soc_dapm_widget_list **list_)
1348 {
1349         struct snd_soc_dpcm *dpcm;
1350         struct snd_soc_dapm_widget_list *list = *list_;
1351         struct snd_soc_dapm_widget *widget;
1352         int prune = 0;
1353
1354         /* Destroy any old FE <--> BE connections */
1355         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1356                 unsigned int i;
1357
1358                 /* is there a valid CPU DAI widget for this BE */
1359                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1360
1361                 /* prune the BE if it's no longer in our active list */
1362                 if (widget && widget_in_list(list, widget))
1363                         continue;
1364
1365                 /* is there a valid CODEC DAI widget for this BE */
1366                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1367                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1368                         widget = dai_get_widget(dai, stream);
1369
1370                         /* prune the BE if it's no longer in our active list */
1371                         if (widget && widget_in_list(list, widget))
1372                                 continue;
1373                 }
1374
1375                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1376                         stream ? "capture" : "playback",
1377                         dpcm->be->dai_link->name, fe->dai_link->name);
1378                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1379                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1380                 prune++;
1381         }
1382
1383         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1384         return prune;
1385 }
1386
1387 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1388         struct snd_soc_dapm_widget_list **list_)
1389 {
1390         struct snd_soc_card *card = fe->card;
1391         struct snd_soc_dapm_widget_list *list = *list_;
1392         struct snd_soc_pcm_runtime *be;
1393         int i, new = 0, err;
1394
1395         /* Create any new FE <--> BE connections */
1396         for (i = 0; i < list->num_widgets; i++) {
1397
1398                 switch (list->widgets[i]->id) {
1399                 case snd_soc_dapm_dai_in:
1400                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1401                                 continue;
1402                         break;
1403                 case snd_soc_dapm_dai_out:
1404                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1405                                 continue;
1406                         break;
1407                 default:
1408                         continue;
1409                 }
1410
1411                 /* is there a valid BE rtd for this widget */
1412                 be = dpcm_get_be(card, list->widgets[i], stream);
1413                 if (!be) {
1414                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1415                                         list->widgets[i]->name);
1416                         continue;
1417                 }
1418
1419                 /* make sure BE is a real BE */
1420                 if (!be->dai_link->no_pcm)
1421                         continue;
1422
1423                 /* don't connect if FE is not running */
1424                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1425                         continue;
1426
1427                 /* newly connected FE and BE */
1428                 err = dpcm_be_connect(fe, be, stream);
1429                 if (err < 0) {
1430                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1431                                 list->widgets[i]->name);
1432                         break;
1433                 } else if (err == 0) /* already connected */
1434                         continue;
1435
1436                 /* new */
1437                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1438                 new++;
1439         }
1440
1441         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1442         return new;
1443 }
1444
1445 /*
1446  * Find the corresponding BE DAIs that source or sink audio to this
1447  * FE substream.
1448  */
1449 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1450         int stream, struct snd_soc_dapm_widget_list **list, int new)
1451 {
1452         if (new)
1453                 return dpcm_add_paths(fe, stream, list);
1454         else
1455                 return dpcm_prune_paths(fe, stream, list);
1456 }
1457
1458 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1459 {
1460         struct snd_soc_dpcm *dpcm;
1461
1462         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1463                 dpcm->be->dpcm[stream].runtime_update =
1464                                                 SND_SOC_DPCM_UPDATE_NO;
1465 }
1466
1467 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1468         int stream)
1469 {
1470         struct snd_soc_dpcm *dpcm;
1471
1472         /* disable any enabled and non active backends */
1473         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1474
1475                 struct snd_soc_pcm_runtime *be = dpcm->be;
1476                 struct snd_pcm_substream *be_substream =
1477                         snd_soc_dpcm_get_substream(be, stream);
1478
1479                 if (be->dpcm[stream].users == 0)
1480                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1481                                 stream ? "capture" : "playback",
1482                                 be->dpcm[stream].state);
1483
1484                 if (--be->dpcm[stream].users != 0)
1485                         continue;
1486
1487                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1488                         continue;
1489
1490                 soc_pcm_close(be_substream);
1491                 be_substream->runtime = NULL;
1492                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1493         }
1494 }
1495
1496 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1497 {
1498         struct snd_soc_dpcm *dpcm;
1499         int err, count = 0;
1500
1501         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1502         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1503
1504                 struct snd_soc_pcm_runtime *be = dpcm->be;
1505                 struct snd_pcm_substream *be_substream =
1506                         snd_soc_dpcm_get_substream(be, stream);
1507
1508                 if (!be_substream) {
1509                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1510                                 stream ? "capture" : "playback");
1511                         continue;
1512                 }
1513
1514                 /* is this op for this BE ? */
1515                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1516                         continue;
1517
1518                 /* first time the dpcm is open ? */
1519                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1520                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1521                                 stream ? "capture" : "playback",
1522                                 be->dpcm[stream].state);
1523
1524                 if (be->dpcm[stream].users++ != 0)
1525                         continue;
1526
1527                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1528                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1529                         continue;
1530
1531                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1532                         stream ? "capture" : "playback", be->dai_link->name);
1533
1534                 be_substream->runtime = be->dpcm[stream].runtime;
1535                 err = soc_pcm_open(be_substream);
1536                 if (err < 0) {
1537                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1538                         be->dpcm[stream].users--;
1539                         if (be->dpcm[stream].users < 0)
1540                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1541                                         stream ? "capture" : "playback",
1542                                         be->dpcm[stream].state);
1543
1544                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1545                         goto unwind;
1546                 }
1547
1548                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1549                 count++;
1550         }
1551
1552         return count;
1553
1554 unwind:
1555         /* disable any enabled and non active backends */
1556         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1557                 struct snd_soc_pcm_runtime *be = dpcm->be;
1558                 struct snd_pcm_substream *be_substream =
1559                         snd_soc_dpcm_get_substream(be, stream);
1560
1561                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1562                         continue;
1563
1564                 if (be->dpcm[stream].users == 0)
1565                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1566                                 stream ? "capture" : "playback",
1567                                 be->dpcm[stream].state);
1568
1569                 if (--be->dpcm[stream].users != 0)
1570                         continue;
1571
1572                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1573                         continue;
1574
1575                 soc_pcm_close(be_substream);
1576                 be_substream->runtime = NULL;
1577                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1578         }
1579
1580         return err;
1581 }
1582
1583 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1584                                  struct snd_soc_pcm_stream *stream,
1585                                  u64 formats)
1586 {
1587         runtime->hw.rate_min = stream->rate_min;
1588         runtime->hw.rate_max = stream->rate_max;
1589         runtime->hw.channels_min = stream->channels_min;
1590         runtime->hw.channels_max = stream->channels_max;
1591         if (runtime->hw.formats)
1592                 runtime->hw.formats &= formats & stream->formats;
1593         else
1594                 runtime->hw.formats = formats & stream->formats;
1595         runtime->hw.rates = stream->rates;
1596 }
1597
1598 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1599 {
1600         struct snd_soc_pcm_runtime *fe = substream->private_data;
1601         struct snd_soc_dpcm *dpcm;
1602         u64 formats = ULLONG_MAX;
1603         int stream = substream->stream;
1604
1605         if (!fe->dai_link->dpcm_merged_format)
1606                 return formats;
1607
1608         /*
1609          * It returns merged BE codec format
1610          * if FE want to use it (= dpcm_merged_format)
1611          */
1612
1613         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1614                 struct snd_soc_pcm_runtime *be = dpcm->be;
1615                 struct snd_soc_dai_driver *codec_dai_drv;
1616                 struct snd_soc_pcm_stream *codec_stream;
1617                 int i;
1618
1619                 for (i = 0; i < be->num_codecs; i++) {
1620                         codec_dai_drv = be->codec_dais[i]->driver;
1621                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1622                                 codec_stream = &codec_dai_drv->playback;
1623                         else
1624                                 codec_stream = &codec_dai_drv->capture;
1625
1626                         formats &= codec_stream->formats;
1627                 }
1628         }
1629
1630         return formats;
1631 }
1632
1633 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1634 {
1635         struct snd_pcm_runtime *runtime = substream->runtime;
1636         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1637         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1638         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1639         u64 format = dpcm_runtime_base_format(substream);
1640
1641         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1642                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1643         else
1644                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1645 }
1646
1647 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1648
1649 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1650  * for avoiding the race with trigger callback.
1651  * If the state is unset and a trigger is pending while the previous operation,
1652  * process the pending trigger action here.
1653  */
1654 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1655                                      int stream, enum snd_soc_dpcm_update state)
1656 {
1657         struct snd_pcm_substream *substream =
1658                 snd_soc_dpcm_get_substream(fe, stream);
1659
1660         snd_pcm_stream_lock_irq(substream);
1661         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1662                 dpcm_fe_dai_do_trigger(substream,
1663                                        fe->dpcm[stream].trigger_pending - 1);
1664                 fe->dpcm[stream].trigger_pending = 0;
1665         }
1666         fe->dpcm[stream].runtime_update = state;
1667         snd_pcm_stream_unlock_irq(substream);
1668 }
1669
1670 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1671                                int stream)
1672 {
1673         struct snd_soc_dpcm *dpcm;
1674         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1675         struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1676         int err;
1677
1678         /* apply symmetry for FE */
1679         if (soc_pcm_has_symmetry(fe_substream))
1680                 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1681
1682         /* Symmetry only applies if we've got an active stream. */
1683         if (fe_cpu_dai->active) {
1684                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1685                 if (err < 0)
1686                         return err;
1687         }
1688
1689         /* apply symmetry for BE */
1690         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1691                 struct snd_soc_pcm_runtime *be = dpcm->be;
1692                 struct snd_pcm_substream *be_substream =
1693                         snd_soc_dpcm_get_substream(be, stream);
1694                 struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
1695                 int i;
1696
1697                 if (soc_pcm_has_symmetry(be_substream))
1698                         be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1699
1700                 /* Symmetry only applies if we've got an active stream. */
1701                 if (rtd->cpu_dai->active) {
1702                         err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
1703                         if (err < 0)
1704                                 return err;
1705                 }
1706
1707                 for (i = 0; i < rtd->num_codecs; i++) {
1708                         if (rtd->codec_dais[i]->active) {
1709                                 err = soc_pcm_apply_symmetry(be_substream,
1710                                                              rtd->codec_dais[i]);
1711                                 if (err < 0)
1712                                         return err;
1713                         }
1714                 }
1715         }
1716
1717         return 0;
1718 }
1719
1720 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1721 {
1722         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1723         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1724         int stream = fe_substream->stream, ret = 0;
1725
1726         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1727
1728         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1729         if (ret < 0) {
1730                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1731                 goto be_err;
1732         }
1733
1734         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1735
1736         /* start the DAI frontend */
1737         ret = soc_pcm_open(fe_substream);
1738         if (ret < 0) {
1739                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1740                 goto unwind;
1741         }
1742
1743         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1744
1745         dpcm_set_fe_runtime(fe_substream);
1746         snd_pcm_limit_hw_rates(runtime);
1747
1748         ret = dpcm_apply_symmetry(fe_substream, stream);
1749         if (ret < 0) {
1750                 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1751                         ret);
1752                 goto unwind;
1753         }
1754
1755         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1756         return 0;
1757
1758 unwind:
1759         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1760 be_err:
1761         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1762         return ret;
1763 }
1764
1765 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1766 {
1767         struct snd_soc_dpcm *dpcm;
1768
1769         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1770         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1771
1772                 struct snd_soc_pcm_runtime *be = dpcm->be;
1773                 struct snd_pcm_substream *be_substream =
1774                         snd_soc_dpcm_get_substream(be, stream);
1775
1776                 /* is this op for this BE ? */
1777                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1778                         continue;
1779
1780                 if (be->dpcm[stream].users == 0)
1781                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1782                                 stream ? "capture" : "playback",
1783                                 be->dpcm[stream].state);
1784
1785                 if (--be->dpcm[stream].users != 0)
1786                         continue;
1787
1788                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1789                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1790                         continue;
1791
1792                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1793                         dpcm->fe->dai_link->name);
1794
1795                 soc_pcm_close(be_substream);
1796                 be_substream->runtime = NULL;
1797
1798                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1799         }
1800         return 0;
1801 }
1802
1803 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1804 {
1805         struct snd_soc_pcm_runtime *fe = substream->private_data;
1806         int stream = substream->stream;
1807
1808         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1809
1810         /* shutdown the BEs */
1811         dpcm_be_dai_shutdown(fe, substream->stream);
1812
1813         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1814
1815         /* now shutdown the frontend */
1816         soc_pcm_close(substream);
1817
1818         /* run the stream event for each BE */
1819         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1820
1821         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1822         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1823         return 0;
1824 }
1825
1826 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1827 {
1828         struct snd_soc_dpcm *dpcm;
1829
1830         /* only hw_params backends that are either sinks or sources
1831          * to this frontend DAI */
1832         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1833
1834                 struct snd_soc_pcm_runtime *be = dpcm->be;
1835                 struct snd_pcm_substream *be_substream =
1836                         snd_soc_dpcm_get_substream(be, stream);
1837
1838                 /* is this op for this BE ? */
1839                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1840                         continue;
1841
1842                 /* only free hw when no longer used - check all FEs */
1843                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1844                                 continue;
1845
1846                 /* do not free hw if this BE is used by other FE */
1847                 if (be->dpcm[stream].users > 1)
1848                         continue;
1849
1850                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1851                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1852                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1853                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1854                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1855                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1856                         continue;
1857
1858                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1859                         dpcm->fe->dai_link->name);
1860
1861                 soc_pcm_hw_free(be_substream);
1862
1863                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1864         }
1865
1866         return 0;
1867 }
1868
1869 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1870 {
1871         struct snd_soc_pcm_runtime *fe = substream->private_data;
1872         int err, stream = substream->stream;
1873
1874         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1875         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1876
1877         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1878
1879         /* call hw_free on the frontend */
1880         err = soc_pcm_hw_free(substream);
1881         if (err < 0)
1882                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1883                         fe->dai_link->name);
1884
1885         /* only hw_params backends that are either sinks or sources
1886          * to this frontend DAI */
1887         err = dpcm_be_dai_hw_free(fe, stream);
1888
1889         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1890         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1891
1892         mutex_unlock(&fe->card->mutex);
1893         return 0;
1894 }
1895
1896 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1897 {
1898         struct snd_soc_dpcm *dpcm;
1899         int ret;
1900
1901         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1902
1903                 struct snd_soc_pcm_runtime *be = dpcm->be;
1904                 struct snd_pcm_substream *be_substream =
1905                         snd_soc_dpcm_get_substream(be, stream);
1906
1907                 /* is this op for this BE ? */
1908                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1909                         continue;
1910
1911                 /* copy params for each dpcm */
1912                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1913                                 sizeof(struct snd_pcm_hw_params));
1914
1915                 /* perform any hw_params fixups */
1916                 if (be->dai_link->be_hw_params_fixup) {
1917                         ret = be->dai_link->be_hw_params_fixup(be,
1918                                         &dpcm->hw_params);
1919                         if (ret < 0) {
1920                                 dev_err(be->dev,
1921                                         "ASoC: hw_params BE fixup failed %d\n",
1922                                         ret);
1923                                 goto unwind;
1924                         }
1925                 }
1926
1927                 /* only allow hw_params() if no connected FEs are running */
1928                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1929                         continue;
1930
1931                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1932                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1933                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1934                         continue;
1935
1936                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1937                         dpcm->fe->dai_link->name);
1938
1939                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1940                 if (ret < 0) {
1941                         dev_err(dpcm->be->dev,
1942                                 "ASoC: hw_params BE failed %d\n", ret);
1943                         goto unwind;
1944                 }
1945
1946                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1947         }
1948         return 0;
1949
1950 unwind:
1951         /* disable any enabled and non active backends */
1952         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1953                 struct snd_soc_pcm_runtime *be = dpcm->be;
1954                 struct snd_pcm_substream *be_substream =
1955                         snd_soc_dpcm_get_substream(be, stream);
1956
1957                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1958                         continue;
1959
1960                 /* only allow hw_free() if no connected FEs are running */
1961                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1962                         continue;
1963
1964                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1965                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1966                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1967                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1968                         continue;
1969
1970                 soc_pcm_hw_free(be_substream);
1971         }
1972
1973         return ret;
1974 }
1975
1976 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1977                                  struct snd_pcm_hw_params *params)
1978 {
1979         struct snd_soc_pcm_runtime *fe = substream->private_data;
1980         int ret, stream = substream->stream;
1981
1982         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1983         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1984
1985         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1986                         sizeof(struct snd_pcm_hw_params));
1987         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1988         if (ret < 0) {
1989                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1990                 goto out;
1991         }
1992
1993         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1994                         fe->dai_link->name, params_rate(params),
1995                         params_channels(params), params_format(params));
1996
1997         /* call hw_params on the frontend */
1998         ret = soc_pcm_hw_params(substream, params);
1999         if (ret < 0) {
2000                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
2001                 dpcm_be_dai_hw_free(fe, stream);
2002          } else
2003                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2004
2005 out:
2006         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2007         mutex_unlock(&fe->card->mutex);
2008         return ret;
2009 }
2010
2011 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2012                 struct snd_pcm_substream *substream, int cmd)
2013 {
2014         int ret;
2015
2016         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2017                         dpcm->fe->dai_link->name, cmd);
2018
2019         ret = soc_pcm_trigger(substream, cmd);
2020         if (ret < 0)
2021                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2022
2023         return ret;
2024 }
2025
2026 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2027                                int cmd)
2028 {
2029         struct snd_soc_dpcm *dpcm;
2030         int ret = 0;
2031
2032         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2033
2034                 struct snd_soc_pcm_runtime *be = dpcm->be;
2035                 struct snd_pcm_substream *be_substream =
2036                         snd_soc_dpcm_get_substream(be, stream);
2037
2038                 /* is this op for this BE ? */
2039                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2040                         continue;
2041
2042                 switch (cmd) {
2043                 case SNDRV_PCM_TRIGGER_START:
2044                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2045                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2046                                 continue;
2047
2048                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2049                         if (ret)
2050                                 return ret;
2051
2052                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2053                         break;
2054                 case SNDRV_PCM_TRIGGER_RESUME:
2055                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2056                                 continue;
2057
2058                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2059                         if (ret)
2060                                 return ret;
2061
2062                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2063                         break;
2064                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2065                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2066                                 continue;
2067
2068                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2069                         if (ret)
2070                                 return ret;
2071
2072                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2073                         break;
2074                 case SNDRV_PCM_TRIGGER_STOP:
2075                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2076                                 continue;
2077
2078                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2079                                 continue;
2080
2081                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2082                         if (ret)
2083                                 return ret;
2084
2085                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2086                         break;
2087                 case SNDRV_PCM_TRIGGER_SUSPEND:
2088                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2089                                 continue;
2090
2091                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2092                                 continue;
2093
2094                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2095                         if (ret)
2096                                 return ret;
2097
2098                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2099                         break;
2100                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2101                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2102                                 continue;
2103
2104                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2105                                 continue;
2106
2107                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2108                         if (ret)
2109                                 return ret;
2110
2111                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2112                         break;
2113                 }
2114         }
2115
2116         return ret;
2117 }
2118 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2119
2120 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2121 {
2122         struct snd_soc_pcm_runtime *fe = substream->private_data;
2123         int stream = substream->stream, ret;
2124         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2125
2126         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2127
2128         switch (trigger) {
2129         case SND_SOC_DPCM_TRIGGER_PRE:
2130                 /* call trigger on the frontend before the backend. */
2131
2132                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2133                                 fe->dai_link->name, cmd);
2134
2135                 ret = soc_pcm_trigger(substream, cmd);
2136                 if (ret < 0) {
2137                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2138                         goto out;
2139                 }
2140
2141                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2142                 break;
2143         case SND_SOC_DPCM_TRIGGER_POST:
2144                 /* call trigger on the frontend after the backend. */
2145
2146                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2147                 if (ret < 0) {
2148                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2149                         goto out;
2150                 }
2151
2152                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2153                                 fe->dai_link->name, cmd);
2154
2155                 ret = soc_pcm_trigger(substream, cmd);
2156                 break;
2157         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2158                 /* bespoke trigger() - handles both FE and BEs */
2159
2160                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2161                                 fe->dai_link->name, cmd);
2162
2163                 ret = soc_pcm_bespoke_trigger(substream, cmd);
2164                 if (ret < 0) {
2165                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2166                         goto out;
2167                 }
2168                 break;
2169         default:
2170                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2171                                 fe->dai_link->name);
2172                 ret = -EINVAL;
2173                 goto out;
2174         }
2175
2176         switch (cmd) {
2177         case SNDRV_PCM_TRIGGER_START:
2178         case SNDRV_PCM_TRIGGER_RESUME:
2179         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2180                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2181                 break;
2182         case SNDRV_PCM_TRIGGER_STOP:
2183         case SNDRV_PCM_TRIGGER_SUSPEND:
2184         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2185                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2186                 break;
2187         }
2188
2189 out:
2190         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2191         return ret;
2192 }
2193
2194 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2195 {
2196         struct snd_soc_pcm_runtime *fe = substream->private_data;
2197         int stream = substream->stream;
2198
2199         /* if FE's runtime_update is already set, we're in race;
2200          * process this trigger later at exit
2201          */
2202         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2203                 fe->dpcm[stream].trigger_pending = cmd + 1;
2204                 return 0; /* delayed, assuming it's successful */
2205         }
2206
2207         /* we're alone, let's trigger */
2208         return dpcm_fe_dai_do_trigger(substream, cmd);
2209 }
2210
2211 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2212 {
2213         struct snd_soc_dpcm *dpcm;
2214         int ret = 0;
2215
2216         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2217
2218                 struct snd_soc_pcm_runtime *be = dpcm->be;
2219                 struct snd_pcm_substream *be_substream =
2220                         snd_soc_dpcm_get_substream(be, stream);
2221
2222                 /* is this op for this BE ? */
2223                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2224                         continue;
2225
2226                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2227                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2228                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2229                         continue;
2230
2231                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2232                         dpcm->fe->dai_link->name);
2233
2234                 ret = soc_pcm_prepare(be_substream);
2235                 if (ret < 0) {
2236                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2237                                 ret);
2238                         break;
2239                 }
2240
2241                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2242         }
2243         return ret;
2244 }
2245
2246 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2247 {
2248         struct snd_soc_pcm_runtime *fe = substream->private_data;
2249         int stream = substream->stream, ret = 0;
2250
2251         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2252
2253         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2254
2255         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2256
2257         /* there is no point preparing this FE if there are no BEs */
2258         if (list_empty(&fe->dpcm[stream].be_clients)) {
2259                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2260                                 fe->dai_link->name);
2261                 ret = -EINVAL;
2262                 goto out;
2263         }
2264
2265         ret = dpcm_be_dai_prepare(fe, substream->stream);
2266         if (ret < 0)
2267                 goto out;
2268
2269         /* call prepare on the frontend */
2270         ret = soc_pcm_prepare(substream);
2271         if (ret < 0) {
2272                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2273                         fe->dai_link->name);
2274                 goto out;
2275         }
2276
2277         /* run the stream event for each BE */
2278         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2279         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2280
2281 out:
2282         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2283         mutex_unlock(&fe->card->mutex);
2284
2285         return ret;
2286 }
2287
2288 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2289                      unsigned int cmd, void *arg)
2290 {
2291         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2292         struct snd_soc_platform *platform = rtd->platform;
2293
2294         if (platform->driver->ops && platform->driver->ops->ioctl)
2295                 return platform->driver->ops->ioctl(substream, cmd, arg);
2296         return snd_pcm_lib_ioctl(substream, cmd, arg);
2297 }
2298
2299 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2300 {
2301         struct snd_pcm_substream *substream =
2302                 snd_soc_dpcm_get_substream(fe, stream);
2303         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2304         int err;
2305
2306         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2307                         stream ? "capture" : "playback", fe->dai_link->name);
2308
2309         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2310                 /* call bespoke trigger - FE takes care of all BE triggers */
2311                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2312                                 fe->dai_link->name);
2313
2314                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2315                 if (err < 0)
2316                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2317         } else {
2318                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2319                         fe->dai_link->name);
2320
2321                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2322                 if (err < 0)
2323                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2324         }
2325
2326         err = dpcm_be_dai_hw_free(fe, stream);
2327         if (err < 0)
2328                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2329
2330         err = dpcm_be_dai_shutdown(fe, stream);
2331         if (err < 0)
2332                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2333
2334         /* run the stream event for each BE */
2335         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2336
2337         return 0;
2338 }
2339
2340 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2341 {
2342         struct snd_pcm_substream *substream =
2343                 snd_soc_dpcm_get_substream(fe, stream);
2344         struct snd_soc_dpcm *dpcm;
2345         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2346         int ret;
2347
2348         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2349                         stream ? "capture" : "playback", fe->dai_link->name);
2350
2351         /* Only start the BE if the FE is ready */
2352         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2353                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2354                 return -EINVAL;
2355
2356         /* startup must always be called for new BEs */
2357         ret = dpcm_be_dai_startup(fe, stream);
2358         if (ret < 0)
2359                 goto disconnect;
2360
2361         /* keep going if FE state is > open */
2362         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2363                 return 0;
2364
2365         ret = dpcm_be_dai_hw_params(fe, stream);
2366         if (ret < 0)
2367                 goto close;
2368
2369         /* keep going if FE state is > hw_params */
2370         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2371                 return 0;
2372
2373
2374         ret = dpcm_be_dai_prepare(fe, stream);
2375         if (ret < 0)
2376                 goto hw_free;
2377
2378         /* run the stream event for each BE */
2379         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2380
2381         /* keep going if FE state is > prepare */
2382         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2383                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2384                 return 0;
2385
2386         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2387                 /* call trigger on the frontend - FE takes care of all BE triggers */
2388                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2389                                 fe->dai_link->name);
2390
2391                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2392                 if (ret < 0) {
2393                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2394                         goto hw_free;
2395                 }
2396         } else {
2397                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2398                         fe->dai_link->name);
2399
2400                 ret = dpcm_be_dai_trigger(fe, stream,
2401                                         SNDRV_PCM_TRIGGER_START);
2402                 if (ret < 0) {
2403                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2404                         goto hw_free;
2405                 }
2406         }
2407
2408         return 0;
2409
2410 hw_free:
2411         dpcm_be_dai_hw_free(fe, stream);
2412 close:
2413         dpcm_be_dai_shutdown(fe, stream);
2414 disconnect:
2415         /* disconnect any non started BEs */
2416         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2417                 struct snd_soc_pcm_runtime *be = dpcm->be;
2418                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2419                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2420         }
2421
2422         return ret;
2423 }
2424
2425 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2426 {
2427         int ret;
2428
2429         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2430         ret = dpcm_run_update_startup(fe, stream);
2431         if (ret < 0)
2432                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2433         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2434
2435         return ret;
2436 }
2437
2438 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2439 {
2440         int ret;
2441
2442         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2443         ret = dpcm_run_update_shutdown(fe, stream);
2444         if (ret < 0)
2445                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2446         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2447
2448         return ret;
2449 }
2450
2451 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2452  * any DAI links.
2453  */
2454 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2455 {
2456         struct snd_soc_pcm_runtime *fe;
2457         int old, new, paths;
2458
2459         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2460         list_for_each_entry(fe, &card->rtd_list, list) {
2461                 struct snd_soc_dapm_widget_list *list;
2462
2463                 /* make sure link is FE */
2464                 if (!fe->dai_link->dynamic)
2465                         continue;
2466
2467                 /* only check active links */
2468                 if (!fe->cpu_dai->active)
2469                         continue;
2470
2471                 /* DAPM sync will call this to update DSP paths */
2472                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2473                         fe->dai_link->name);
2474
2475                 /* skip if FE doesn't have playback capability */
2476                 if (!fe->cpu_dai->driver->playback.channels_min
2477                     || !fe->codec_dai->driver->playback.channels_min)
2478                         goto capture;
2479
2480                 /* skip if FE isn't currently playing */
2481                 if (!fe->cpu_dai->playback_active
2482                     || !fe->codec_dai->playback_active)
2483                         goto capture;
2484
2485                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2486                 if (paths < 0) {
2487                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2488                                         fe->dai_link->name,  "playback");
2489                         mutex_unlock(&card->mutex);
2490                         return paths;
2491                 }
2492
2493                 /* update any new playback paths */
2494                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2495                 if (new) {
2496                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2497                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2498                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2499                 }
2500
2501                 /* update any old playback paths */
2502                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2503                 if (old) {
2504                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2505                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2506                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2507                 }
2508
2509                 dpcm_path_put(&list);
2510 capture:
2511                 /* skip if FE doesn't have capture capability */
2512                 if (!fe->cpu_dai->driver->capture.channels_min
2513                     || !fe->codec_dai->driver->capture.channels_min)
2514                         continue;
2515
2516                 /* skip if FE isn't currently capturing */
2517                 if (!fe->cpu_dai->capture_active
2518                     || !fe->codec_dai->capture_active)
2519                         continue;
2520
2521                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2522                 if (paths < 0) {
2523                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2524                                         fe->dai_link->name,  "capture");
2525                         mutex_unlock(&card->mutex);
2526                         return paths;
2527                 }
2528
2529                 /* update any new capture paths */
2530                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2531                 if (new) {
2532                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2533                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2534                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2535                 }
2536
2537                 /* update any old capture paths */
2538                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2539                 if (old) {
2540                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2541                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2542                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2543                 }
2544
2545                 dpcm_path_put(&list);
2546         }
2547
2548         mutex_unlock(&card->mutex);
2549         return 0;
2550 }
2551 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2552 {
2553         struct snd_soc_dpcm *dpcm;
2554         struct list_head *clients =
2555                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2556
2557         list_for_each_entry(dpcm, clients, list_be) {
2558
2559                 struct snd_soc_pcm_runtime *be = dpcm->be;
2560                 int i;
2561
2562                 if (be->dai_link->ignore_suspend)
2563                         continue;
2564
2565                 for (i = 0; i < be->num_codecs; i++) {
2566                         struct snd_soc_dai *dai = be->codec_dais[i];
2567                         struct snd_soc_dai_driver *drv = dai->driver;
2568
2569                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2570                                          be->dai_link->name);
2571
2572                         if (drv->ops && drv->ops->digital_mute &&
2573                                                         dai->playback_active)
2574                                 drv->ops->digital_mute(dai, mute);
2575                 }
2576         }
2577
2578         return 0;
2579 }
2580
2581 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2582 {
2583         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2584         struct snd_soc_dpcm *dpcm;
2585         struct snd_soc_dapm_widget_list *list;
2586         int ret;
2587         int stream = fe_substream->stream;
2588
2589         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2590         fe->dpcm[stream].runtime = fe_substream->runtime;
2591
2592         ret = dpcm_path_get(fe, stream, &list);
2593         if (ret < 0) {
2594                 mutex_unlock(&fe->card->mutex);
2595                 return ret;
2596         } else if (ret == 0) {
2597                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2598                         fe->dai_link->name, stream ? "capture" : "playback");
2599         }
2600
2601         /* calculate valid and active FE <-> BE dpcms */
2602         dpcm_process_paths(fe, stream, &list, 1);
2603
2604         ret = dpcm_fe_dai_startup(fe_substream);
2605         if (ret < 0) {
2606                 /* clean up all links */
2607                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2608                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2609
2610                 dpcm_be_disconnect(fe, stream);
2611                 fe->dpcm[stream].runtime = NULL;
2612         }
2613
2614         dpcm_clear_pending_state(fe, stream);
2615         dpcm_path_put(&list);
2616         mutex_unlock(&fe->card->mutex);
2617         return ret;
2618 }
2619
2620 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2621 {
2622         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2623         struct snd_soc_dpcm *dpcm;
2624         int stream = fe_substream->stream, ret;
2625
2626         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2627         ret = dpcm_fe_dai_shutdown(fe_substream);
2628
2629         /* mark FE's links ready to prune */
2630         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2631                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2632
2633         dpcm_be_disconnect(fe, stream);
2634
2635         fe->dpcm[stream].runtime = NULL;
2636         mutex_unlock(&fe->card->mutex);
2637         return ret;
2638 }
2639
2640 /* create a new pcm */
2641 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2642 {
2643         struct snd_soc_platform *platform = rtd->platform;
2644         struct snd_soc_dai *codec_dai;
2645         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2646         struct snd_pcm *pcm;
2647         char new_name[64];
2648         int ret = 0, playback = 0, capture = 0;
2649         int i;
2650
2651         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2652                 playback = rtd->dai_link->dpcm_playback;
2653                 capture = rtd->dai_link->dpcm_capture;
2654         } else {
2655                 for (i = 0; i < rtd->num_codecs; i++) {
2656                         codec_dai = rtd->codec_dais[i];
2657                         if (codec_dai->driver->playback.channels_min)
2658                                 playback = 1;
2659                         if (codec_dai->driver->capture.channels_min)
2660                                 capture = 1;
2661                 }
2662
2663                 capture = capture && cpu_dai->driver->capture.channels_min;
2664                 playback = playback && cpu_dai->driver->playback.channels_min;
2665         }
2666
2667         if (rtd->dai_link->playback_only) {
2668                 playback = 1;
2669                 capture = 0;
2670         }
2671
2672         if (rtd->dai_link->capture_only) {
2673                 playback = 0;
2674                 capture = 1;
2675         }
2676
2677         /* create the PCM */
2678         if (rtd->dai_link->no_pcm) {
2679                 snprintf(new_name, sizeof(new_name), "(%s)",
2680                         rtd->dai_link->stream_name);
2681
2682                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2683                                 playback, capture, &pcm);
2684         } else {
2685                 if (rtd->dai_link->dynamic)
2686                         snprintf(new_name, sizeof(new_name), "%s (*)",
2687                                 rtd->dai_link->stream_name);
2688                 else
2689                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2690                                 rtd->dai_link->stream_name,
2691                                 (rtd->num_codecs > 1) ?
2692                                 "multicodec" : rtd->codec_dai->name, num);
2693
2694                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2695                         capture, &pcm);
2696         }
2697         if (ret < 0) {
2698                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2699                         rtd->dai_link->name);
2700                 return ret;
2701         }
2702         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2703
2704         /* DAPM dai link stream work */
2705         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2706
2707         pcm->nonatomic = rtd->dai_link->nonatomic;
2708         rtd->pcm = pcm;
2709         pcm->private_data = rtd;
2710
2711         if (rtd->dai_link->no_pcm) {
2712                 if (playback)
2713                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2714                 if (capture)
2715                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2716                 goto out;
2717         }
2718
2719         /* ASoC PCM operations */
2720         if (rtd->dai_link->dynamic) {
2721                 rtd->ops.open           = dpcm_fe_dai_open;
2722                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2723                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2724                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2725                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2726                 rtd->ops.close          = dpcm_fe_dai_close;
2727                 rtd->ops.pointer        = soc_pcm_pointer;
2728                 rtd->ops.ioctl          = soc_pcm_ioctl;
2729         } else {
2730                 rtd->ops.open           = soc_pcm_open;
2731                 rtd->ops.hw_params      = soc_pcm_hw_params;
2732                 rtd->ops.prepare        = soc_pcm_prepare;
2733                 rtd->ops.trigger        = soc_pcm_trigger;
2734                 rtd->ops.hw_free        = soc_pcm_hw_free;
2735                 rtd->ops.close          = soc_pcm_close;
2736                 rtd->ops.pointer        = soc_pcm_pointer;
2737                 rtd->ops.ioctl          = soc_pcm_ioctl;
2738         }
2739
2740         if (platform->driver->ops) {
2741                 rtd->ops.ack            = platform->driver->ops->ack;
2742                 rtd->ops.copy           = platform->driver->ops->copy;
2743                 rtd->ops.silence        = platform->driver->ops->silence;
2744                 rtd->ops.page           = platform->driver->ops->page;
2745                 rtd->ops.mmap           = platform->driver->ops->mmap;
2746         }
2747
2748         if (playback)
2749                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2750
2751         if (capture)
2752                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2753
2754         if (platform->driver->pcm_new) {
2755                 ret = platform->driver->pcm_new(rtd);
2756                 if (ret < 0) {
2757                         dev_err(platform->dev,
2758                                 "ASoC: pcm constructor failed: %d\n",
2759                                 ret);
2760                         return ret;
2761                 }
2762         }
2763
2764         pcm->private_free = platform->driver->pcm_free;
2765 out:
2766         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2767                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2768                  cpu_dai->name);
2769         return ret;
2770 }
2771
2772 /* is the current PCM operation for this FE ? */
2773 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2774 {
2775         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2776                 return 1;
2777         return 0;
2778 }
2779 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2780
2781 /* is the current PCM operation for this BE ? */
2782 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2783                 struct snd_soc_pcm_runtime *be, int stream)
2784 {
2785         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2786            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2787                   be->dpcm[stream].runtime_update))
2788                 return 1;
2789         return 0;
2790 }
2791 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2792
2793 /* get the substream for this BE */
2794 struct snd_pcm_substream *
2795         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2796 {
2797         return be->pcm->streams[stream].substream;
2798 }
2799 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2800
2801 /* get the BE runtime state */
2802 enum snd_soc_dpcm_state
2803         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2804 {
2805         return be->dpcm[stream].state;
2806 }
2807 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2808
2809 /* set the BE runtime state */
2810 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2811                 int stream, enum snd_soc_dpcm_state state)
2812 {
2813         be->dpcm[stream].state = state;
2814 }
2815 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2816
2817 /*
2818  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2819  * are not running, paused or suspended for the specified stream direction.
2820  */
2821 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2822                 struct snd_soc_pcm_runtime *be, int stream)
2823 {
2824         struct snd_soc_dpcm *dpcm;
2825         int state;
2826
2827         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2828
2829                 if (dpcm->fe == fe)
2830                         continue;
2831
2832                 state = dpcm->fe->dpcm[stream].state;
2833                 if (state == SND_SOC_DPCM_STATE_START ||
2834                         state == SND_SOC_DPCM_STATE_PAUSED ||
2835                         state == SND_SOC_DPCM_STATE_SUSPEND)
2836                         return 0;
2837         }
2838
2839         /* it's safe to free/stop this BE DAI */
2840         return 1;
2841 }
2842 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2843
2844 /*
2845  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2846  * running, paused or suspended for the specified stream direction.
2847  */
2848 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2849                 struct snd_soc_pcm_runtime *be, int stream)
2850 {
2851         struct snd_soc_dpcm *dpcm;
2852         int state;
2853
2854         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2855
2856                 if (dpcm->fe == fe)
2857                         continue;
2858
2859                 state = dpcm->fe->dpcm[stream].state;
2860                 if (state == SND_SOC_DPCM_STATE_START ||
2861                         state == SND_SOC_DPCM_STATE_PAUSED ||
2862                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2863                         state == SND_SOC_DPCM_STATE_PREPARE)
2864                         return 0;
2865         }
2866
2867         /* it's safe to change hw_params */
2868         return 1;
2869 }
2870 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2871
2872 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2873                 int cmd, struct snd_soc_platform *platform)
2874 {
2875         if (platform->driver->ops && platform->driver->ops->trigger)
2876                 return platform->driver->ops->trigger(substream, cmd);
2877         return 0;
2878 }
2879 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2880
2881 #ifdef CONFIG_DEBUG_FS
2882 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2883 {
2884         switch (state) {
2885         case SND_SOC_DPCM_STATE_NEW:
2886                 return "new";
2887         case SND_SOC_DPCM_STATE_OPEN:
2888                 return "open";
2889         case SND_SOC_DPCM_STATE_HW_PARAMS:
2890                 return "hw_params";
2891         case SND_SOC_DPCM_STATE_PREPARE:
2892                 return "prepare";
2893         case SND_SOC_DPCM_STATE_START:
2894                 return "start";
2895         case SND_SOC_DPCM_STATE_STOP:
2896                 return "stop";
2897         case SND_SOC_DPCM_STATE_SUSPEND:
2898                 return "suspend";
2899         case SND_SOC_DPCM_STATE_PAUSED:
2900                 return "paused";
2901         case SND_SOC_DPCM_STATE_HW_FREE:
2902                 return "hw_free";
2903         case SND_SOC_DPCM_STATE_CLOSE:
2904                 return "close";
2905         }
2906
2907         return "unknown";
2908 }
2909
2910 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2911                                 int stream, char *buf, size_t size)
2912 {
2913         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2914         struct snd_soc_dpcm *dpcm;
2915         ssize_t offset = 0;
2916
2917         /* FE state */
2918         offset += snprintf(buf + offset, size - offset,
2919                         "[%s - %s]\n", fe->dai_link->name,
2920                         stream ? "Capture" : "Playback");
2921
2922         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2923                         dpcm_state_string(fe->dpcm[stream].state));
2924
2925         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2926             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2927                 offset += snprintf(buf + offset, size - offset,
2928                                 "Hardware Params: "
2929                                 "Format = %s, Channels = %d, Rate = %d\n",
2930                                 snd_pcm_format_name(params_format(params)),
2931                                 params_channels(params),
2932                                 params_rate(params));
2933
2934         /* BEs state */
2935         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2936
2937         if (list_empty(&fe->dpcm[stream].be_clients)) {
2938                 offset += snprintf(buf + offset, size - offset,
2939                                 " No active DSP links\n");
2940                 goto out;
2941         }
2942
2943         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2944                 struct snd_soc_pcm_runtime *be = dpcm->be;
2945                 params = &dpcm->hw_params;
2946
2947                 offset += snprintf(buf + offset, size - offset,
2948                                 "- %s\n", be->dai_link->name);
2949
2950                 offset += snprintf(buf + offset, size - offset,
2951                                 "   State: %s\n",
2952                                 dpcm_state_string(be->dpcm[stream].state));
2953
2954                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2955                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2956                         offset += snprintf(buf + offset, size - offset,
2957                                 "   Hardware Params: "
2958                                 "Format = %s, Channels = %d, Rate = %d\n",
2959                                 snd_pcm_format_name(params_format(params)),
2960                                 params_channels(params),
2961                                 params_rate(params));
2962         }
2963
2964 out:
2965         return offset;
2966 }
2967
2968 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2969                                 size_t count, loff_t *ppos)
2970 {
2971         struct snd_soc_pcm_runtime *fe = file->private_data;
2972         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2973         char *buf;
2974
2975         buf = kmalloc(out_count, GFP_KERNEL);
2976         if (!buf)
2977                 return -ENOMEM;
2978
2979         if (fe->cpu_dai->driver->playback.channels_min)
2980                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2981                                         buf + offset, out_count - offset);
2982
2983         if (fe->cpu_dai->driver->capture.channels_min)
2984                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2985                                         buf + offset, out_count - offset);
2986
2987         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2988
2989         kfree(buf);
2990         return ret;
2991 }
2992
2993 static const struct file_operations dpcm_state_fops = {
2994         .open = simple_open,
2995         .read = dpcm_state_read_file,
2996         .llseek = default_llseek,
2997 };
2998
2999 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
3000 {
3001         if (!rtd->dai_link)
3002                 return;
3003
3004         if (!rtd->card->debugfs_card_root)
3005                 return;
3006
3007         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
3008                         rtd->card->debugfs_card_root);
3009         if (!rtd->debugfs_dpcm_root) {
3010                 dev_dbg(rtd->dev,
3011                          "ASoC: Failed to create dpcm debugfs directory %s\n",
3012                          rtd->dai_link->name);
3013                 return;
3014         }
3015
3016         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
3017                                                 rtd->debugfs_dpcm_root,
3018                                                 rtd, &dpcm_state_fops);
3019 }
3020 #endif