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 channels at all, it supports the stream */
  52         return codec_stream->channels_min;
  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                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
 185                     (be->dpcm[dir].users >= 1))
 186                         continue;
 187
 188                 snd_soc_dapm_stream_event(be, dir, event);
 189         }
 190
 191         snd_soc_dapm_stream_event(fe, dir, event);
 192
 193         return 0;
 194 }
 195
 196 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 197                                         struct snd_soc_dai *soc_dai)
 198 {
 199         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 200         int ret;
 201
 202         if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
 203                                 rtd->dai_link->symmetric_rates)) {
 204                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
 205                                 soc_dai->rate);
 206
 207                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 208                                                 SNDRV_PCM_HW_PARAM_RATE,
 209                                                 soc_dai->rate);
 210                 if (ret < 0) {
 211                         dev_err(soc_dai->dev,
 212                                 "ASoC: Unable to apply rate constraint: %d\n",
 213                                 ret);
 214                         return ret;
 215                 }
 216         }
 217
 218         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
 219                                 rtd->dai_link->symmetric_channels)) {
 220                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
 221                                 soc_dai->channels);
 222
 223                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 224                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
 225                                                 soc_dai->channels);
 226                 if (ret < 0) {
 227                         dev_err(soc_dai->dev,
 228                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
 229                                 ret);
 230                         return ret;
 231                 }
 232         }
 233
 234         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
 235                                 rtd->dai_link->symmetric_samplebits)) {
 236                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
 237                                 soc_dai->sample_bits);
 238
 239                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 240                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
 241                                                 soc_dai->sample_bits);
 242                 if (ret < 0) {
 243                         dev_err(soc_dai->dev,
 244                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
 245                                 ret);
 246                         return ret;
 247                 }
 248         }
 249
 250         return 0;
 251 }
 252
 253 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 254                                 struct snd_pcm_hw_params *params)
 255 {
 256         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 257         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 258         unsigned int rate, channels, sample_bits, symmetry, i;
 259
 260         rate = params_rate(params);
 261         channels = params_channels(params);
 262         sample_bits = snd_pcm_format_physical_width(params_format(params));
 263
 264         /* reject unmatched parameters when applying symmetry */
 265         symmetry = cpu_dai->driver->symmetric_rates ||
 266                 rtd->dai_link->symmetric_rates;
 267
 268         for (i = 0; i < rtd->num_codecs; i++)
 269                 symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;
 270
 271         if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
 272                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
 273                                 cpu_dai->rate, rate);
 274                 return -EINVAL;
 275         }
 276
 277         symmetry = cpu_dai->driver->symmetric_channels ||
 278                 rtd->dai_link->symmetric_channels;
 279
 280         for (i = 0; i < rtd->num_codecs; i++)
 281                 symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;
 282
 283         if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
 284                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
 285                                 cpu_dai->channels, channels);
 286                 return -EINVAL;
 287         }
 288
 289         symmetry = cpu_dai->driver->symmetric_samplebits ||
 290                 rtd->dai_link->symmetric_samplebits;
 291
 292         for (i = 0; i < rtd->num_codecs; i++)
 293                 symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;
 294
 295         if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
 296                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
 297                                 cpu_dai->sample_bits, sample_bits);
 298                 return -EINVAL;
 299         }
 300
 301         return 0;
 302 }
 303
 304 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
 305 {
 306         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 307         struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
 308         struct snd_soc_dai_link *link = rtd->dai_link;
 309         unsigned int symmetry, i;
 310
 311         symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
 312                 cpu_driver->symmetric_channels || link->symmetric_channels ||
 313                 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
 314
 315         for (i = 0; i < rtd->num_codecs; i++)
 316                 symmetry = symmetry ||
 317                         rtd->codec_dais[i]->driver->symmetric_rates ||
 318                         rtd->codec_dais[i]->driver->symmetric_channels ||
 319                         rtd->codec_dais[i]->driver->symmetric_samplebits;
 320
 321         return symmetry;
 322 }
 323
 324 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 325 {
 326         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 327         int ret;
 328
 329         if (!bits)
 330                 return;
 331
 332         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 333         if (ret != 0)
 334                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 335                                  bits, ret);
 336 }
 337
 338 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 339 {
 340         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 341         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 342         struct snd_soc_dai *codec_dai;
 343         int i;
 344         unsigned int bits = 0, cpu_bits;
 345
 346         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 347                 for (i = 0; i < rtd->num_codecs; i++) {
 348                         codec_dai = rtd->codec_dais[i];
 349                         if (codec_dai->driver->playback.sig_bits == 0) {
 350                                 bits = 0;
 351                                 break;
 352                         }
 353                         bits = max(codec_dai->driver->playback.sig_bits, bits);
 354                 }
 355                 cpu_bits = cpu_dai->driver->playback.sig_bits;
 356         } else {
 357                 for (i = 0; i < rtd->num_codecs; i++) {
 358                         codec_dai = rtd->codec_dais[i];
 359                         if (codec_dai->driver->capture.sig_bits == 0) {
 360                                 bits = 0;
 361                                 break;
 362                         }
 363                         bits = max(codec_dai->driver->capture.sig_bits, bits);
 364                 }
 365                 cpu_bits = cpu_dai->driver->capture.sig_bits;
 366         }
 367
 368         soc_pcm_set_msb(substream, bits);
 369         soc_pcm_set_msb(substream, cpu_bits);
 370 }
 371
 372 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 373 {
 374         struct snd_pcm_runtime *runtime = substream->runtime;
 375         struct snd_pcm_hardware *hw = &runtime->hw;
 376         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 377         struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
 378         struct snd_soc_dai_driver *codec_dai_drv;
 379         struct snd_soc_pcm_stream *codec_stream;
 380         struct snd_soc_pcm_stream *cpu_stream;
 381         unsigned int chan_min = 0, chan_max = UINT_MAX;
 382         unsigned int rate_min = 0, rate_max = UINT_MAX;
 383         unsigned int rates = UINT_MAX;
 384         u64 formats = ULLONG_MAX;
 385         int i;
 386
 387         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 388                 cpu_stream = &cpu_dai_drv->playback;
 389         else
 390                 cpu_stream = &cpu_dai_drv->capture;
 391
 392         /* first calculate min/max only for CODECs in the DAI link */
 393         for (i = 0; i < rtd->num_codecs; i++) {
 394
 395                 /*
 396                  * Skip CODECs which don't support the current stream type.
 397                  * Otherwise, since the rate, channel, and format values will
 398                  * zero in that case, we would have no usable settings left,
 399                  * causing the resulting setup to fail.
 400                  * At least one CODEC should match, otherwise we should have
 401                  * bailed out on a higher level, since there would be no
 402                  * CODEC to support the transfer direction in that case.
 403                  */
 404                 if (!snd_soc_dai_stream_valid(rtd->codec_dais[i],
 405                                               substream->stream))
 406                         continue;
 407
 408                 codec_dai_drv = rtd->codec_dais[i]->driver;
 409                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 410                         codec_stream = &codec_dai_drv->playback;
 411                 else
 412                         codec_stream = &codec_dai_drv->capture;
 413                 chan_min = max(chan_min, codec_stream->channels_min);
 414                 chan_max = min(chan_max, codec_stream->channels_max);
 415                 rate_min = max(rate_min, codec_stream->rate_min);
 416                 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
 417                 formats &= codec_stream->formats;
 418                 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
 419         }
 420
 421         /*
 422          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 423          * connected to a single CPU DAI, use CPU DAI's directly and let
 424          * channel allocation be fixed up later
 425          */
 426         if (rtd->num_codecs > 1) {
 427                 chan_min = cpu_stream->channels_min;
 428                 chan_max = cpu_stream->channels_max;
 429         }
 430
 431         hw->channels_min = max(chan_min, cpu_stream->channels_min);
 432         hw->channels_max = min(chan_max, cpu_stream->channels_max);
 433         if (hw->formats)
 434                 hw->formats &= formats & cpu_stream->formats;
 435         else
 436                 hw->formats = formats & cpu_stream->formats;
 437         hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
 438
 439         snd_pcm_limit_hw_rates(runtime);
 440
 441         hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
 442         hw->rate_min = max(hw->rate_min, rate_min);
 443         hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
 444         hw->rate_max = min_not_zero(hw->rate_max, rate_max);
 445 }
 446
 447 /*
 448  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 449  * then initialized and any private data can be allocated. This also calls
 450  * startup for the cpu DAI, platform, machine and codec DAI.
 451  */
 452 static int soc_pcm_open(struct snd_pcm_substream *substream)
 453 {
 454         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 455         struct snd_pcm_runtime *runtime = substream->runtime;
 456         struct snd_soc_platform *platform = rtd->platform;
 457         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 458         struct snd_soc_dai *codec_dai;
 459         const char *codec_dai_name = "multicodec";
 460         int i, ret = 0;
 461
 462         pinctrl_pm_select_default_state(cpu_dai->dev);
 463         for (i = 0; i < rtd->num_codecs; i++)
 464                 pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
 465         pm_runtime_get_sync(cpu_dai->dev);
 466         for (i = 0; i < rtd->num_codecs; i++)
 467                 pm_runtime_get_sync(rtd->codec_dais[i]->dev);
 468         pm_runtime_get_sync(platform->dev);
 469
 470         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 471
 472         /* startup the audio subsystem */
 473         if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
 474                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 475                 if (ret < 0) {
 476                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 477                                 " %s: %d\n", cpu_dai->name, ret);
 478                         goto out;
 479                 }
 480         }
 481
 482         if (platform->driver->ops && platform->driver->ops->open) {
 483                 ret = platform->driver->ops->open(substream);
 484                 if (ret < 0) {
 485                         dev_err(platform->dev, "ASoC: can't open platform"
 486                                 " %s: %d\n", platform->component.name, ret);
 487                         goto platform_err;
 488                 }
 489         }
 490
 491         for (i = 0; i < rtd->num_codecs; i++) {
 492                 codec_dai = rtd->codec_dais[i];
 493                 if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
 494                         ret = codec_dai->driver->ops->startup(substream,
 495                                                               codec_dai);
 496                         if (ret < 0) {
 497                                 dev_err(codec_dai->dev,
 498                                         "ASoC: can't open codec %s: %d\n",
 499                                         codec_dai->name, ret);
 500                                 goto codec_dai_err;
 501                         }
 502                 }
 503
 504                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 505                         codec_dai->tx_mask = 0;
 506                 else
 507                         codec_dai->rx_mask = 0;
 508         }
 509
 510         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 511                 ret = rtd->dai_link->ops->startup(substream);
 512                 if (ret < 0) {
 513                         pr_err("ASoC: %s startup failed: %d\n",
 514                                rtd->dai_link->name, ret);
 515                         goto machine_err;
 516                 }
 517         }
 518
 519         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 520         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 521                 goto dynamic;
 522
 523         /* Check that the codec and cpu DAIs are compatible */
 524         soc_pcm_init_runtime_hw(substream);
 525
 526         if (rtd->num_codecs == 1)
 527                 codec_dai_name = rtd->codec_dai->name;
 528
 529         if (soc_pcm_has_symmetry(substream))
 530                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 531
 532         ret = -EINVAL;
 533         if (!runtime->hw.rates) {
 534                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 535                         codec_dai_name, cpu_dai->name);
 536                 goto config_err;
 537         }
 538         if (!runtime->hw.formats) {
 539                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 540                         codec_dai_name, cpu_dai->name);
 541                 goto config_err;
 542         }
 543         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 544             runtime->hw.channels_min > runtime->hw.channels_max) {
 545                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 546                                 codec_dai_name, cpu_dai->name);
 547                 goto config_err;
 548         }
 549
 550         soc_pcm_apply_msb(substream);
 551
 552         /* Symmetry only applies if we've already got an active stream. */
 553         if (cpu_dai->active) {
 554                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 555                 if (ret != 0)
 556                         goto config_err;
 557         }
 558
 559         for (i = 0; i < rtd->num_codecs; i++) {
 560                 if (rtd->codec_dais[i]->active) {
 561                         ret = soc_pcm_apply_symmetry(substream,
 562                                                      rtd->codec_dais[i]);
 563                         if (ret != 0)
 564                                 goto config_err;
 565                 }
 566         }
 567
 568         pr_debug("ASoC: %s <-> %s info:\n",
 569                         codec_dai_name, cpu_dai->name);
 570         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 571         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 572                  runtime->hw.channels_max);
 573         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 574                  runtime->hw.rate_max);
 575
 576 dynamic:
 577
 578         snd_soc_runtime_activate(rtd, substream->stream);
 579
 580         mutex_unlock(&rtd->pcm_mutex);
 581         return 0;
 582
 583 config_err:
 584         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 585                 rtd->dai_link->ops->shutdown(substream);
 586
 587 machine_err:
 588         i = rtd->num_codecs;
 589
 590 codec_dai_err:
 591         while (--i >= 0) {
 592                 codec_dai = rtd->codec_dais[i];
 593                 if (codec_dai->driver->ops->shutdown)
 594                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 595         }
 596
 597         if (platform->driver->ops && platform->driver->ops->close)
 598                 platform->driver->ops->close(substream);
 599
 600 platform_err:
 601         if (cpu_dai->driver->ops->shutdown)
 602                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 603 out:
 604         mutex_unlock(&rtd->pcm_mutex);
 605
 606         pm_runtime_mark_last_busy(platform->dev);
 607         pm_runtime_put_autosuspend(platform->dev);
 608         for (i = 0; i < rtd->num_codecs; i++) {
 609                 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
 610                 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
 611         }
 612
 613         pm_runtime_mark_last_busy(cpu_dai->dev);
 614         pm_runtime_put_autosuspend(cpu_dai->dev);
 615         for (i = 0; i < rtd->num_codecs; i++) {
 616                 if (!rtd->codec_dais[i]->active)
 617                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 618         }
 619         if (!cpu_dai->active)
 620                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 621
 622         return ret;
 623 }
 624
 625 /*
 626  * Power down the audio subsystem pmdown_time msecs after close is called.
 627  * This is to ensure there are no pops or clicks in between any music tracks
 628  * due to DAPM power cycling.
 629  */
 630 static void close_delayed_work(struct work_struct *work)
 631 {
 632         struct snd_soc_pcm_runtime *rtd =
 633                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 634         struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
 635
 636         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 637
 638         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 639                  codec_dai->driver->playback.stream_name,
 640                  codec_dai->playback_active ? "active" : "inactive",
 641                  rtd->pop_wait ? "yes" : "no");
 642
 643         /* are we waiting on this codec DAI stream */
 644         if (rtd->pop_wait == 1) {
 645                 rtd->pop_wait = 0;
 646                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 647                                           SND_SOC_DAPM_STREAM_STOP);
 648         }
 649
 650         mutex_unlock(&rtd->pcm_mutex);
 651 }
 652
 653 /*
 654  * Called by ALSA when a PCM substream is closed. Private data can be
 655  * freed here. The cpu DAI, codec DAI, machine and platform are also
 656  * shutdown.
 657  */
 658 static int soc_pcm_close(struct snd_pcm_substream *substream)
 659 {
 660         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 661         struct snd_soc_platform *platform = rtd->platform;
 662         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 663         struct snd_soc_dai *codec_dai;
 664         int i;
 665
 666         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 667
 668         snd_soc_runtime_deactivate(rtd, substream->stream);
 669
 670         /* clear the corresponding DAIs rate when inactive */
 671         if (!cpu_dai->active)
 672                 cpu_dai->rate = 0;
 673
 674         for (i = 0; i < rtd->num_codecs; i++) {
 675                 codec_dai = rtd->codec_dais[i];
 676                 if (!codec_dai->active)
 677                         codec_dai->rate = 0;
 678         }
 679
 680         snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
 681
 682         if (cpu_dai->driver->ops->shutdown)
 683                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 684
 685         for (i = 0; i < rtd->num_codecs; i++) {
 686                 codec_dai = rtd->codec_dais[i];
 687                 if (codec_dai->driver->ops->shutdown)
 688                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 689         }
 690
 691         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 692                 rtd->dai_link->ops->shutdown(substream);
 693
 694         if (platform->driver->ops && platform->driver->ops->close)
 695                 platform->driver->ops->close(substream);
 696
 697         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 698                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
 699                         /* powered down playback stream now */
 700                         snd_soc_dapm_stream_event(rtd,
 701                                                   SNDRV_PCM_STREAM_PLAYBACK,
 702                                                   SND_SOC_DAPM_STREAM_STOP);
 703                 } else {
 704                         /* start delayed pop wq here for playback streams */
 705                         rtd->pop_wait = 1;
 706                         queue_delayed_work(system_power_efficient_wq,
 707                                            &rtd->delayed_work,
 708                                            msecs_to_jiffies(rtd->pmdown_time));
 709                 }
 710         } else {
 711                 /* capture streams can be powered down now */
 712                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 713                                           SND_SOC_DAPM_STREAM_STOP);
 714         }
 715
 716         mutex_unlock(&rtd->pcm_mutex);
 717
 718         pm_runtime_mark_last_busy(platform->dev);
 719         pm_runtime_put_autosuspend(platform->dev);
 720
 721         for (i = 0; i < rtd->num_codecs; i++) {
 722                 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
 723                 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
 724         }
 725
 726         pm_runtime_mark_last_busy(cpu_dai->dev);
 727         pm_runtime_put_autosuspend(cpu_dai->dev);
 728
 729         for (i = 0; i < rtd->num_codecs; i++) {
 730                 if (!rtd->codec_dais[i]->active)
 731                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 732         }
 733         if (!cpu_dai->active)
 734                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 735
 736         return 0;
 737 }
 738
 739 /*
 740  * Called by ALSA when the PCM substream is prepared, can set format, sample
 741  * rate, etc.  This function is non atomic and can be called multiple times,
 742  * it can refer to the runtime info.
 743  */
 744 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 745 {
 746         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 747         struct snd_soc_platform *platform = rtd->platform;
 748         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 749         struct snd_soc_dai *codec_dai;
 750         int i, ret = 0;
 751
 752         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 753
 754         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 755                 ret = rtd->dai_link->ops->prepare(substream);
 756                 if (ret < 0) {
 757                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 758                                 " %d\n", ret);
 759                         goto out;
 760                 }
 761         }
 762
 763         if (platform->driver->ops && platform->driver->ops->prepare) {
 764                 ret = platform->driver->ops->prepare(substream);
 765                 if (ret < 0) {
 766                         dev_err(platform->dev, "ASoC: platform prepare error:"
 767                                 " %d\n", ret);
 768                         goto out;
 769                 }
 770         }
 771
 772         for (i = 0; i < rtd->num_codecs; i++) {
 773                 codec_dai = rtd->codec_dais[i];
 774                 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
 775                         ret = codec_dai->driver->ops->prepare(substream,
 776                                                               codec_dai);
 777                         if (ret < 0) {
 778                                 dev_err(codec_dai->dev,
 779                                         "ASoC: codec DAI prepare error: %d\n",
 780                                         ret);
 781                                 goto out;
 782                         }
 783                 }
 784         }
 785
 786         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 787                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 788                 if (ret < 0) {
 789                         dev_err(cpu_dai->dev,
 790                                 "ASoC: cpu DAI prepare error: %d\n", ret);
 791                         goto out;
 792                 }
 793         }
 794
 795         /* cancel any delayed stream shutdown that is pending */
 796         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 797             rtd->pop_wait) {
 798                 rtd->pop_wait = 0;
 799                 cancel_delayed_work(&rtd->delayed_work);
 800         }
 801
 802         snd_soc_dapm_stream_event(rtd, substream->stream,
 803                         SND_SOC_DAPM_STREAM_START);
 804
 805         for (i = 0; i < rtd->num_codecs; i++)
 806                 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
 807                                          substream->stream);
 808         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
 809
 810 out:
 811         mutex_unlock(&rtd->pcm_mutex);
 812         return ret;
 813 }
 814
 815 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 816                                        unsigned int mask)
 817 {
 818         struct snd_interval *interval;
 819         int channels = hweight_long(mask);
 820
 821         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 822         interval->min = channels;
 823         interval->max = channels;
 824 }
 825
 826 int soc_dai_hw_params(struct snd_pcm_substream *substream,
 827                       struct snd_pcm_hw_params *params,
 828                       struct snd_soc_dai *dai)
 829 {
 830         int ret;
 831
 832         if (dai->driver->ops && dai->driver->ops->hw_params) {
 833                 ret = dai->driver->ops->hw_params(substream, params, dai);
 834                 if (ret < 0) {
 835                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
 836                                 dai->name, ret);
 837                         return ret;
 838                 }
 839         }
 840
 841         return 0;
 842 }
 843
 844 /*
 845  * Called by ALSA when the hardware params are set by application. This
 846  * function can also be called multiple times and can allocate buffers
 847  * (using snd_pcm_lib_* ). It's non-atomic.
 848  */
 849 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 850                                 struct snd_pcm_hw_params *params)
 851 {
 852         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 853         struct snd_soc_platform *platform = rtd->platform;
 854         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 855         int i, ret = 0;
 856
 857         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 858
 859         ret = soc_pcm_params_symmetry(substream, params);
 860         if (ret)
 861                 goto out;
 862
 863         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 864                 ret = rtd->dai_link->ops->hw_params(substream, params);
 865                 if (ret < 0) {
 866                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 867                                 " failed: %d\n", ret);
 868                         goto out;
 869                 }
 870         }
 871
 872         for (i = 0; i < rtd->num_codecs; i++) {
 873                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 874                 struct snd_pcm_hw_params codec_params;
 875
 876                 /*
 877                  * Skip CODECs which don't support the current stream type,
 878                  * the idea being that if a CODEC is not used for the currently
 879                  * set up transfer direction, it should not need to be
 880                  * configured, especially since the configuration used might
 881                  * not even be supported by that CODEC. There may be cases
 882                  * however where a CODEC needs to be set up although it is
 883                  * actually not being used for the transfer, e.g. if a
 884                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
 885                  * for the DAI link including a playback-only CODEC.
 886                  * If this becomes necessary, we will have to augment the
 887                  * machine driver setup with information on how to act, so
 888                  * we can do the right thing here.
 889                  */
 890                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 891                         continue;
 892
 893                 /* copy params for each codec */
 894                 codec_params = *params;
 895
 896                 /* fixup params based on TDM slot masks */
 897                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 898                     codec_dai->tx_mask)
 899                         soc_pcm_codec_params_fixup(&codec_params,
 900                                                    codec_dai->tx_mask);
 901
 902                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
 903                     codec_dai->rx_mask)
 904                         soc_pcm_codec_params_fixup(&codec_params,
 905                                                    codec_dai->rx_mask);
 906
 907                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
 908                 if(ret < 0)
 909                         goto codec_err;
 910
 911                 codec_dai->rate = params_rate(&codec_params);
 912                 codec_dai->channels = params_channels(&codec_params);
 913                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 914                                                 params_format(&codec_params));
 915         }
 916
 917         ret = soc_dai_hw_params(substream, params, cpu_dai);
 918         if (ret < 0)
 919                 goto interface_err;
 920
 921         if (platform->driver->ops && platform->driver->ops->hw_params) {
 922                 ret = platform->driver->ops->hw_params(substream, params);
 923                 if (ret < 0) {
 924                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 925                                platform->component.name, ret);
 926                         goto platform_err;
 927                 }
 928         }
 929
 930         /* store the parameters for each DAIs */
 931         cpu_dai->rate = params_rate(params);
 932         cpu_dai->channels = params_channels(params);
 933         cpu_dai->sample_bits =
 934                 snd_pcm_format_physical_width(params_format(params));
 935
 936 out:
 937         mutex_unlock(&rtd->pcm_mutex);
 938         return ret;
 939
 940 platform_err:
 941         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 942                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 943
 944 interface_err:
 945         i = rtd->num_codecs;
 946
 947 codec_err:
 948         while (--i >= 0) {
 949                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 950                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 951                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 952                 codec_dai->rate = 0;
 953         }
 954
 955         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 956                 rtd->dai_link->ops->hw_free(substream);
 957
 958         mutex_unlock(&rtd->pcm_mutex);
 959         return ret;
 960 }
 961
 962 /*
 963  * Frees resources allocated by hw_params, can be called multiple times
 964  */
 965 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 966 {
 967         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 968         struct snd_soc_platform *platform = rtd->platform;
 969         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 970         struct snd_soc_dai *codec_dai;
 971         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 972         int i;
 973
 974         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 975
 976         /* clear the corresponding DAIs parameters when going to be inactive */
 977         if (cpu_dai->active == 1) {
 978                 cpu_dai->rate = 0;
 979                 cpu_dai->channels = 0;
 980                 cpu_dai->sample_bits = 0;
 981         }
 982
 983         for (i = 0; i < rtd->num_codecs; i++) {
 984                 codec_dai = rtd->codec_dais[i];
 985                 if (codec_dai->active == 1) {
 986                         codec_dai->rate = 0;
 987                         codec_dai->channels = 0;
 988                         codec_dai->sample_bits = 0;
 989                 }
 990         }
 991
 992         /* apply codec digital mute */
 993         for (i = 0; i < rtd->num_codecs; i++) {
 994                 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
 995                     (!playback && rtd->codec_dais[i]->capture_active == 1))
 996                         snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
 997                                                  substream->stream);
 998         }
 999
1000         /* free any machine hw params */
1001         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
1002                 rtd->dai_link->ops->hw_free(substream);
1003
1004         /* free any DMA resources */
1005         if (platform->driver->ops && platform->driver->ops->hw_free)
1006                 platform->driver->ops->hw_free(substream);
1007
1008         /* now free hw params for the DAIs  */
1009         for (i = 0; i < rtd->num_codecs; i++) {
1010                 codec_dai = rtd->codec_dais[i];
1011                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
1012                         codec_dai->driver->ops->hw_free(substream, codec_dai);
1013         }
1014
1015         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
1016                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
1017
1018         mutex_unlock(&rtd->pcm_mutex);
1019         return 0;
1020 }
1021
1022 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1023 {
1024         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1025         struct snd_soc_platform *platform = rtd->platform;
1026         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1027         struct snd_soc_dai *codec_dai;
1028         int i, ret;
1029
1030         for (i = 0; i < rtd->num_codecs; i++) {
1031                 codec_dai = rtd->codec_dais[i];
1032                 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
1033                         ret = codec_dai->driver->ops->trigger(substream,
1034                                                               cmd, codec_dai);
1035                         if (ret < 0)
1036                                 return ret;
1037                 }
1038         }
1039
1040         if (platform->driver->ops && platform->driver->ops->trigger) {
1041                 ret = platform->driver->ops->trigger(substream, cmd);
1042                 if (ret < 0)
1043                         return ret;
1044         }
1045
1046         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
1047                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
1048                 if (ret < 0)
1049                         return ret;
1050         }
1051
1052         if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1053                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1054                 if (ret < 0)
1055                         return ret;
1056         }
1057
1058         return 0;
1059 }
1060
1061 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1062                                    int cmd)
1063 {
1064         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1065         struct snd_soc_platform *platform = rtd->platform;
1066         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1067         struct snd_soc_dai *codec_dai;
1068         int i, ret;
1069
1070         for (i = 0; i < rtd->num_codecs; i++) {
1071                 codec_dai = rtd->codec_dais[i];
1072                 if (codec_dai->driver->ops &&
1073                     codec_dai->driver->ops->bespoke_trigger) {
1074                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1075                                                                 cmd, codec_dai);
1076                         if (ret < 0)
1077                                 return ret;
1078                 }
1079         }
1080
1081         if (platform->driver->bespoke_trigger) {
1082                 ret = platform->driver->bespoke_trigger(substream, cmd);
1083                 if (ret < 0)
1084                         return ret;
1085         }
1086
1087         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1088                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1089                 if (ret < 0)
1090                         return ret;
1091         }
1092         return 0;
1093 }
1094 /*
1095  * soc level wrapper for pointer callback
1096  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1097  * the runtime->delay will be updated accordingly.
1098  */
1099 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1100 {
1101         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1102         struct snd_soc_platform *platform = rtd->platform;
1103         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1104         struct snd_soc_dai *codec_dai;
1105         struct snd_pcm_runtime *runtime = substream->runtime;
1106         snd_pcm_uframes_t offset = 0;
1107         snd_pcm_sframes_t delay = 0;
1108         snd_pcm_sframes_t codec_delay = 0;
1109         int i;
1110
1111         if (platform->driver->ops && platform->driver->ops->pointer)
1112                 offset = platform->driver->ops->pointer(substream);
1113
1114         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1115                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1116
1117         for (i = 0; i < rtd->num_codecs; i++) {
1118                 codec_dai = rtd->codec_dais[i];
1119                 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1120                         codec_delay = max(codec_delay,
1121                                         codec_dai->driver->ops->delay(substream,
1122                                                                     codec_dai));
1123         }
1124         delay += codec_delay;
1125
1126         /*
1127          * None of the existing platform drivers implement delay(), so
1128          * for now the codec_dai of first multicodec entry is used
1129          */
1130         if (platform->driver->delay)
1131                 delay += platform->driver->delay(substream, rtd->codec_dais[0]);
1132
1133         runtime->delay = delay;
1134
1135         return offset;
1136 }
1137
1138 /* connect a FE and BE */
1139 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1140                 struct snd_soc_pcm_runtime *be, int stream)
1141 {
1142         struct snd_soc_dpcm *dpcm;
1143
1144         /* only add new dpcms */
1145         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1146                 if (dpcm->be == be && dpcm->fe == fe)
1147                         return 0;
1148         }
1149
1150         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1151         if (!dpcm)
1152                 return -ENOMEM;
1153
1154         dpcm->be = be;
1155         dpcm->fe = fe;
1156         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1157         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1158         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1159         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1160
1161         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1162                         stream ? "capture" : "playback",  fe->dai_link->name,
1163                         stream ? "<-" : "->", be->dai_link->name);
1164
1165 #ifdef CONFIG_DEBUG_FS
1166         if (fe->debugfs_dpcm_root)
1167                 dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1168                                 fe->debugfs_dpcm_root, &dpcm->state);
1169 #endif
1170         return 1;
1171 }
1172
1173 /* reparent a BE onto another FE */
1174 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1175                         struct snd_soc_pcm_runtime *be, int stream)
1176 {
1177         struct snd_soc_dpcm *dpcm;
1178         struct snd_pcm_substream *fe_substream, *be_substream;
1179
1180         /* reparent if BE is connected to other FEs */
1181         if (!be->dpcm[stream].users)
1182                 return;
1183
1184         be_substream = snd_soc_dpcm_get_substream(be, stream);
1185         if (!be_substream)
1186                 return;
1187
1188         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1189                 if (dpcm->fe == fe)
1190                         continue;
1191
1192                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1193                         stream ? "capture" : "playback",
1194                         dpcm->fe->dai_link->name,
1195                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1196
1197                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1198                 be_substream->runtime = fe_substream->runtime;
1199                 break;
1200         }
1201 }
1202
1203 /* disconnect a BE and FE */
1204 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1205 {
1206         struct snd_soc_dpcm *dpcm, *d;
1207
1208         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1209                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1210                                 stream ? "capture" : "playback",
1211                                 dpcm->be->dai_link->name);
1212
1213                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1214                         continue;
1215
1216                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1217                         stream ? "capture" : "playback", fe->dai_link->name,
1218                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1219
1220                 /* BEs still alive need new FE */
1221                 dpcm_be_reparent(fe, dpcm->be, stream);
1222
1223 #ifdef CONFIG_DEBUG_FS
1224                 debugfs_remove(dpcm->debugfs_state);
1225 #endif
1226                 list_del(&dpcm->list_be);
1227                 list_del(&dpcm->list_fe);
1228                 kfree(dpcm);
1229         }
1230 }
1231
1232 /* get BE for DAI widget and stream */
1233 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1234                 struct snd_soc_dapm_widget *widget, int stream)
1235 {
1236         struct snd_soc_pcm_runtime *be;
1237         int i;
1238
1239         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1240                 list_for_each_entry(be, &card->rtd_list, list) {
1241
1242                         if (!be->dai_link->no_pcm)
1243                                 continue;
1244
1245                         if (be->cpu_dai->playback_widget == widget)
1246                                 return be;
1247
1248                         for (i = 0; i < be->num_codecs; i++) {
1249                                 struct snd_soc_dai *dai = be->codec_dais[i];
1250                                 if (dai->playback_widget == widget)
1251                                         return be;
1252                         }
1253                 }
1254         } else {
1255
1256                 list_for_each_entry(be, &card->rtd_list, list) {
1257
1258                         if (!be->dai_link->no_pcm)
1259                                 continue;
1260
1261                         if (be->cpu_dai->capture_widget == widget)
1262                                 return be;
1263
1264                         for (i = 0; i < be->num_codecs; i++) {
1265                                 struct snd_soc_dai *dai = be->codec_dais[i];
1266                                 if (dai->capture_widget == widget)
1267                                         return be;
1268                         }
1269                 }
1270         }
1271
1272         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1273                 stream ? "capture" : "playback", widget->name);
1274         return NULL;
1275 }
1276
1277 static inline struct snd_soc_dapm_widget *
1278         dai_get_widget(struct snd_soc_dai *dai, int stream)
1279 {
1280         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1281                 return dai->playback_widget;
1282         else
1283                 return dai->capture_widget;
1284 }
1285
1286 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1287                 struct snd_soc_dapm_widget *widget)
1288 {
1289         int i;
1290
1291         for (i = 0; i < list->num_widgets; i++) {
1292                 if (widget == list->widgets[i])
1293                         return 1;
1294         }
1295
1296         return 0;
1297 }
1298
1299 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1300                 enum snd_soc_dapm_direction dir)
1301 {
1302         struct snd_soc_card *card = widget->dapm->card;
1303         struct snd_soc_pcm_runtime *rtd;
1304         int i;
1305
1306         if (dir == SND_SOC_DAPM_DIR_OUT) {
1307                 list_for_each_entry(rtd, &card->rtd_list, list) {
1308                         if (!rtd->dai_link->no_pcm)
1309                                 continue;
1310
1311                         if (rtd->cpu_dai->playback_widget == widget)
1312                                 return true;
1313
1314                         for (i = 0; i < rtd->num_codecs; ++i) {
1315                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1316                                 if (dai->playback_widget == widget)
1317                                         return true;
1318                         }
1319                 }
1320         } else { /* SND_SOC_DAPM_DIR_IN */
1321                 list_for_each_entry(rtd, &card->rtd_list, list) {
1322                         if (!rtd->dai_link->no_pcm)
1323                                 continue;
1324
1325                         if (rtd->cpu_dai->capture_widget == widget)
1326                                 return true;
1327
1328                         for (i = 0; i < rtd->num_codecs; ++i) {
1329                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1330                                 if (dai->capture_widget == widget)
1331                                         return true;
1332                         }
1333                 }
1334         }
1335
1336         return false;
1337 }
1338
1339 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1340         int stream, struct snd_soc_dapm_widget_list **list)
1341 {
1342         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1343         int paths;
1344
1345         /* get number of valid DAI paths and their widgets */
1346         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1347                         dpcm_end_walk_at_be);
1348
1349         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1350                         stream ? "capture" : "playback");
1351
1352         return paths;
1353 }
1354
1355 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1356         struct snd_soc_dapm_widget_list **list_)
1357 {
1358         struct snd_soc_dpcm *dpcm;
1359         struct snd_soc_dapm_widget_list *list = *list_;
1360         struct snd_soc_dapm_widget *widget;
1361         int prune = 0;
1362
1363         /* Destroy any old FE <--> BE connections */
1364         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1365                 unsigned int i;
1366
1367                 /* is there a valid CPU DAI widget for this BE */
1368                 widget = dai_get_widget(dpcm->be->cpu_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                 /* is there a valid CODEC DAI widget for this BE */
1375                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1376                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1377                         widget = dai_get_widget(dai, stream);
1378
1379                         /* prune the BE if it's no longer in our active list */
1380                         if (widget && widget_in_list(list, widget))
1381                                 continue;
1382                 }
1383
1384                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1385                         stream ? "capture" : "playback",
1386                         dpcm->be->dai_link->name, fe->dai_link->name);
1387                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1388                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1389                 prune++;
1390         }
1391
1392         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1393         return prune;
1394 }
1395
1396 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1397         struct snd_soc_dapm_widget_list **list_)
1398 {
1399         struct snd_soc_card *card = fe->card;
1400         struct snd_soc_dapm_widget_list *list = *list_;
1401         struct snd_soc_pcm_runtime *be;
1402         int i, new = 0, err;
1403
1404         /* Create any new FE <--> BE connections */
1405         for (i = 0; i < list->num_widgets; i++) {
1406
1407                 switch (list->widgets[i]->id) {
1408                 case snd_soc_dapm_dai_in:
1409                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1410                                 continue;
1411                         break;
1412                 case snd_soc_dapm_dai_out:
1413                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1414                                 continue;
1415                         break;
1416                 default:
1417                         continue;
1418                 }
1419
1420                 /* is there a valid BE rtd for this widget */
1421                 be = dpcm_get_be(card, list->widgets[i], stream);
1422                 if (!be) {
1423                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1424                                         list->widgets[i]->name);
1425                         continue;
1426                 }
1427
1428                 /* make sure BE is a real BE */
1429                 if (!be->dai_link->no_pcm)
1430                         continue;
1431
1432                 /* don't connect if FE is not running */
1433                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1434                         continue;
1435
1436                 /* newly connected FE and BE */
1437                 err = dpcm_be_connect(fe, be, stream);
1438                 if (err < 0) {
1439                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1440                                 list->widgets[i]->name);
1441                         break;
1442                 } else if (err == 0) /* already connected */
1443                         continue;
1444
1445                 /* new */
1446                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1447                 new++;
1448         }
1449
1450         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1451         return new;
1452 }
1453
1454 /*
1455  * Find the corresponding BE DAIs that source or sink audio to this
1456  * FE substream.
1457  */
1458 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1459         int stream, struct snd_soc_dapm_widget_list **list, int new)
1460 {
1461         if (new)
1462                 return dpcm_add_paths(fe, stream, list);
1463         else
1464                 return dpcm_prune_paths(fe, stream, list);
1465 }
1466
1467 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1468 {
1469         struct snd_soc_dpcm *dpcm;
1470
1471         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1472                 dpcm->be->dpcm[stream].runtime_update =
1473                                                 SND_SOC_DPCM_UPDATE_NO;
1474 }
1475
1476 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1477         int stream)
1478 {
1479         struct snd_soc_dpcm *dpcm;
1480
1481         /* disable any enabled and non active backends */
1482         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1483
1484                 struct snd_soc_pcm_runtime *be = dpcm->be;
1485                 struct snd_pcm_substream *be_substream =
1486                         snd_soc_dpcm_get_substream(be, stream);
1487
1488                 if (be->dpcm[stream].users == 0)
1489                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1490                                 stream ? "capture" : "playback",
1491                                 be->dpcm[stream].state);
1492
1493                 if (--be->dpcm[stream].users != 0)
1494                         continue;
1495
1496                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1497                         continue;
1498
1499                 soc_pcm_close(be_substream);
1500                 be_substream->runtime = NULL;
1501                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1502         }
1503 }
1504
1505 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1506 {
1507         struct snd_soc_dpcm *dpcm;
1508         int err, count = 0;
1509
1510         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1511         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1512
1513                 struct snd_soc_pcm_runtime *be = dpcm->be;
1514                 struct snd_pcm_substream *be_substream =
1515                         snd_soc_dpcm_get_substream(be, stream);
1516
1517                 if (!be_substream) {
1518                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1519                                 stream ? "capture" : "playback");
1520                         continue;
1521                 }
1522
1523                 /* is this op for this BE ? */
1524                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1525                         continue;
1526
1527                 /* first time the dpcm is open ? */
1528                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1529                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1530                                 stream ? "capture" : "playback",
1531                                 be->dpcm[stream].state);
1532
1533                 if (be->dpcm[stream].users++ != 0)
1534                         continue;
1535
1536                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1537                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1538                         continue;
1539
1540                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1541                         stream ? "capture" : "playback", be->dai_link->name);
1542
1543                 be_substream->runtime = be->dpcm[stream].runtime;
1544                 err = soc_pcm_open(be_substream);
1545                 if (err < 0) {
1546                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1547                         be->dpcm[stream].users--;
1548                         if (be->dpcm[stream].users < 0)
1549                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1550                                         stream ? "capture" : "playback",
1551                                         be->dpcm[stream].state);
1552
1553                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1554                         goto unwind;
1555                 }
1556
1557                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1558                 count++;
1559         }
1560
1561         return count;
1562
1563 unwind:
1564         /* disable any enabled and non active backends */
1565         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1566                 struct snd_soc_pcm_runtime *be = dpcm->be;
1567                 struct snd_pcm_substream *be_substream =
1568                         snd_soc_dpcm_get_substream(be, stream);
1569
1570                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1571                         continue;
1572
1573                 if (be->dpcm[stream].users == 0)
1574                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1575                                 stream ? "capture" : "playback",
1576                                 be->dpcm[stream].state);
1577
1578                 if (--be->dpcm[stream].users != 0)
1579                         continue;
1580
1581                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1582                         continue;
1583
1584                 soc_pcm_close(be_substream);
1585                 be_substream->runtime = NULL;
1586                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1587         }
1588
1589         return err;
1590 }
1591
1592 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1593                                  struct snd_soc_pcm_stream *stream,
1594                                  u64 formats)
1595 {
1596         runtime->hw.rate_min = stream->rate_min;
1597         runtime->hw.rate_max = min_not_zero(stream->rate_max, UINT_MAX);
1598         runtime->hw.channels_min = stream->channels_min;
1599         runtime->hw.channels_max = stream->channels_max;
1600         if (runtime->hw.formats)
1601                 runtime->hw.formats &= formats & stream->formats;
1602         else
1603                 runtime->hw.formats = formats & stream->formats;
1604         runtime->hw.rates = stream->rates;
1605 }
1606
1607 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1608 {
1609         struct snd_soc_pcm_runtime *fe = substream->private_data;
1610         struct snd_soc_dpcm *dpcm;
1611         u64 formats = ULLONG_MAX;
1612         int stream = substream->stream;
1613
1614         if (!fe->dai_link->dpcm_merged_format)
1615                 return formats;
1616
1617         /*
1618          * It returns merged BE codec format
1619          * if FE want to use it (= dpcm_merged_format)
1620          */
1621
1622         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1623                 struct snd_soc_pcm_runtime *be = dpcm->be;
1624                 struct snd_soc_dai_driver *codec_dai_drv;
1625                 struct snd_soc_pcm_stream *codec_stream;
1626                 int i;
1627
1628                 for (i = 0; i < be->num_codecs; i++) {
1629                         /*
1630                          * Skip CODECs which don't support the current stream
1631                          * type. See soc_pcm_init_runtime_hw() for more details
1632                          */
1633                         if (!snd_soc_dai_stream_valid(be->codec_dais[i],
1634                                                       stream))
1635                                 continue;
1636
1637                         codec_dai_drv = be->codec_dais[i]->driver;
1638                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1639                                 codec_stream = &codec_dai_drv->playback;
1640                         else
1641                                 codec_stream = &codec_dai_drv->capture;
1642
1643                         formats &= codec_stream->formats;
1644                 }
1645         }
1646
1647         return formats;
1648 }
1649
1650 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1651 {
1652         struct snd_pcm_runtime *runtime = substream->runtime;
1653         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1654         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1655         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1656         u64 format = dpcm_runtime_base_format(substream);
1657
1658         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1659                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1660         else
1661                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1662 }
1663
1664 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1665
1666 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1667  * for avoiding the race with trigger callback.
1668  * If the state is unset and a trigger is pending while the previous operation,
1669  * process the pending trigger action here.
1670  */
1671 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1672                                      int stream, enum snd_soc_dpcm_update state)
1673 {
1674         struct snd_pcm_substream *substream =
1675                 snd_soc_dpcm_get_substream(fe, stream);
1676
1677         snd_pcm_stream_lock_irq(substream);
1678         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1679                 dpcm_fe_dai_do_trigger(substream,
1680                                        fe->dpcm[stream].trigger_pending - 1);
1681                 fe->dpcm[stream].trigger_pending = 0;
1682         }
1683         fe->dpcm[stream].runtime_update = state;
1684         snd_pcm_stream_unlock_irq(substream);
1685 }
1686
1687 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1688                                int stream)
1689 {
1690         struct snd_soc_dpcm *dpcm;
1691         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1692         struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1693         int err;
1694
1695         /* apply symmetry for FE */
1696         if (soc_pcm_has_symmetry(fe_substream))
1697                 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1698
1699         /* Symmetry only applies if we've got an active stream. */
1700         if (fe_cpu_dai->active) {
1701                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1702                 if (err < 0)
1703                         return err;
1704         }
1705
1706         /* apply symmetry for BE */
1707         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1708                 struct snd_soc_pcm_runtime *be = dpcm->be;
1709                 struct snd_pcm_substream *be_substream =
1710                         snd_soc_dpcm_get_substream(be, stream);
1711                 struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
1712                 int i;
1713
1714                 if (rtd->dai_link->be_hw_params_fixup)
1715                         continue;
1716
1717                 if (soc_pcm_has_symmetry(be_substream))
1718                         be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1719
1720                 /* Symmetry only applies if we've got an active stream. */
1721                 if (rtd->cpu_dai->active) {
1722                         err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
1723                         if (err < 0)
1724                                 return err;
1725                 }
1726
1727                 for (i = 0; i < rtd->num_codecs; i++) {
1728                         if (rtd->codec_dais[i]->active) {
1729                                 err = soc_pcm_apply_symmetry(be_substream,
1730                                                              rtd->codec_dais[i]);
1731                                 if (err < 0)
1732                                         return err;
1733                         }
1734                 }
1735         }
1736
1737         return 0;
1738 }
1739
1740 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1741 {
1742         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1743         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1744         int stream = fe_substream->stream, ret = 0;
1745
1746         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1747
1748         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1749         if (ret < 0) {
1750                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1751                 goto be_err;
1752         }
1753
1754         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1755
1756         /* start the DAI frontend */
1757         ret = soc_pcm_open(fe_substream);
1758         if (ret < 0) {
1759                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1760                 goto unwind;
1761         }
1762
1763         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1764
1765         dpcm_set_fe_runtime(fe_substream);
1766         snd_pcm_limit_hw_rates(runtime);
1767
1768         ret = dpcm_apply_symmetry(fe_substream, stream);
1769         if (ret < 0) {
1770                 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1771                         ret);
1772                 goto unwind;
1773         }
1774
1775         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1776         return 0;
1777
1778 unwind:
1779         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1780 be_err:
1781         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1782         return ret;
1783 }
1784
1785 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1786 {
1787         struct snd_soc_dpcm *dpcm;
1788
1789         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1790         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1791
1792                 struct snd_soc_pcm_runtime *be = dpcm->be;
1793                 struct snd_pcm_substream *be_substream =
1794                         snd_soc_dpcm_get_substream(be, stream);
1795
1796                 /* is this op for this BE ? */
1797                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1798                         continue;
1799
1800                 if (be->dpcm[stream].users == 0)
1801                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1802                                 stream ? "capture" : "playback",
1803                                 be->dpcm[stream].state);
1804
1805                 if (--be->dpcm[stream].users != 0)
1806                         continue;
1807
1808                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1809                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)) {
1810                         soc_pcm_hw_free(be_substream);
1811                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1812                 }
1813
1814                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1815                         be->dai_link->name);
1816
1817                 soc_pcm_close(be_substream);
1818                 be_substream->runtime = NULL;
1819
1820                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1821         }
1822         return 0;
1823 }
1824
1825 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1826 {
1827         struct snd_soc_pcm_runtime *fe = substream->private_data;
1828         int stream = substream->stream;
1829
1830         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1831
1832         /* shutdown the BEs */
1833         dpcm_be_dai_shutdown(fe, substream->stream);
1834
1835         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1836
1837         /* now shutdown the frontend */
1838         soc_pcm_close(substream);
1839
1840         /* run the stream event for each BE */
1841         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1842
1843         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1844         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1845         return 0;
1846 }
1847
1848 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1849 {
1850         struct snd_soc_dpcm *dpcm;
1851
1852         /* only hw_params backends that are either sinks or sources
1853          * to this frontend DAI */
1854         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1855
1856                 struct snd_soc_pcm_runtime *be = dpcm->be;
1857                 struct snd_pcm_substream *be_substream =
1858                         snd_soc_dpcm_get_substream(be, stream);
1859
1860                 /* is this op for this BE ? */
1861                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1862                         continue;
1863
1864                 /* only free hw when no longer used - check all FEs */
1865                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1866                                 continue;
1867
1868                 /* do not free hw if this BE is used by other FE */
1869                 if (be->dpcm[stream].users > 1)
1870                         continue;
1871
1872                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1873                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1874                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1875                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1876                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1877                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1878                         continue;
1879
1880                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1881                         be->dai_link->name);
1882
1883                 soc_pcm_hw_free(be_substream);
1884
1885                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1886         }
1887
1888         return 0;
1889 }
1890
1891 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1892 {
1893         struct snd_soc_pcm_runtime *fe = substream->private_data;
1894         int err, stream = substream->stream;
1895
1896         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1897         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1898
1899         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1900
1901         /* call hw_free on the frontend */
1902         err = soc_pcm_hw_free(substream);
1903         if (err < 0)
1904                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1905                         fe->dai_link->name);
1906
1907         /* only hw_params backends that are either sinks or sources
1908          * to this frontend DAI */
1909         err = dpcm_be_dai_hw_free(fe, stream);
1910
1911         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1912         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1913
1914         mutex_unlock(&fe->card->mutex);
1915         return 0;
1916 }
1917
1918 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1919 {
1920         struct snd_soc_dpcm *dpcm;
1921         int ret;
1922
1923         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1924
1925                 struct snd_soc_pcm_runtime *be = dpcm->be;
1926                 struct snd_pcm_substream *be_substream =
1927                         snd_soc_dpcm_get_substream(be, stream);
1928
1929                 /* is this op for this BE ? */
1930                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1931                         continue;
1932
1933                 /* copy params for each dpcm */
1934                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1935                                 sizeof(struct snd_pcm_hw_params));
1936
1937                 /* perform any hw_params fixups */
1938                 if (be->dai_link->be_hw_params_fixup) {
1939                         ret = be->dai_link->be_hw_params_fixup(be,
1940                                         &dpcm->hw_params);
1941                         if (ret < 0) {
1942                                 dev_err(be->dev,
1943                                         "ASoC: hw_params BE fixup failed %d\n",
1944                                         ret);
1945                                 goto unwind;
1946                         }
1947                 }
1948
1949                 /* only allow hw_params() if no connected FEs are running */
1950                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1951                         continue;
1952
1953                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1954                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1955                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1956                         continue;
1957
1958                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1959                         be->dai_link->name);
1960
1961                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1962                 if (ret < 0) {
1963                         dev_err(dpcm->be->dev,
1964                                 "ASoC: hw_params BE failed %d\n", ret);
1965                         goto unwind;
1966                 }
1967
1968                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1969         }
1970         return 0;
1971
1972 unwind:
1973         /* disable any enabled and non active backends */
1974         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1975                 struct snd_soc_pcm_runtime *be = dpcm->be;
1976                 struct snd_pcm_substream *be_substream =
1977                         snd_soc_dpcm_get_substream(be, stream);
1978
1979                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1980                         continue;
1981
1982                 /* only allow hw_free() if no connected FEs are running */
1983                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1984                         continue;
1985
1986                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1987                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1988                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1989                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1990                         continue;
1991
1992                 soc_pcm_hw_free(be_substream);
1993         }
1994
1995         return ret;
1996 }
1997
1998 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1999                                  struct snd_pcm_hw_params *params)
2000 {
2001         struct snd_soc_pcm_runtime *fe = substream->private_data;
2002         int ret, stream = substream->stream;
2003
2004         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2005         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2006
2007         memcpy(&fe->dpcm[substream->stream].hw_params, params,
2008                         sizeof(struct snd_pcm_hw_params));
2009         ret = dpcm_be_dai_hw_params(fe, substream->stream);
2010         if (ret < 0) {
2011                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
2012                 goto out;
2013         }
2014
2015         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2016                         fe->dai_link->name, params_rate(params),
2017                         params_channels(params), params_format(params));
2018
2019         /* call hw_params on the frontend */
2020         ret = soc_pcm_hw_params(substream, params);
2021         if (ret < 0) {
2022                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
2023                 dpcm_be_dai_hw_free(fe, stream);
2024          } else
2025                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2026
2027 out:
2028         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2029         mutex_unlock(&fe->card->mutex);
2030         return ret;
2031 }
2032
2033 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2034                 struct snd_pcm_substream *substream, int cmd)
2035 {
2036         int ret;
2037
2038         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2039                         dpcm->be->dai_link->name, cmd);
2040
2041         ret = soc_pcm_trigger(substream, cmd);
2042         if (ret < 0)
2043                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2044
2045         return ret;
2046 }
2047
2048 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2049                                int cmd)
2050 {
2051         struct snd_soc_dpcm *dpcm;
2052         int ret = 0;
2053
2054         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2055
2056                 struct snd_soc_pcm_runtime *be = dpcm->be;
2057                 struct snd_pcm_substream *be_substream =
2058                         snd_soc_dpcm_get_substream(be, stream);
2059
2060                 /* is this op for this BE ? */
2061                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2062                         continue;
2063
2064                 switch (cmd) {
2065                 case SNDRV_PCM_TRIGGER_START:
2066                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2067                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2068                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2069                                 continue;
2070
2071                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2072                         if (ret)
2073                                 return ret;
2074
2075                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2076                         break;
2077                 case SNDRV_PCM_TRIGGER_RESUME:
2078                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
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_START;
2086                         break;
2087                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2088                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2089                                 continue;
2090
2091                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2092                         if (ret)
2093                                 return ret;
2094
2095                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2096                         break;
2097                 case SNDRV_PCM_TRIGGER_STOP:
2098                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2099                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2100                                 continue;
2101
2102                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2103                                 continue;
2104
2105                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2106                         if (ret)
2107                                 return ret;
2108
2109                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2110                         break;
2111                 case SNDRV_PCM_TRIGGER_SUSPEND:
2112                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2113                                 continue;
2114
2115                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2116                                 continue;
2117
2118                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2119                         if (ret)
2120                                 return ret;
2121
2122                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2123                         break;
2124                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2125                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2126                                 continue;
2127
2128                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2129                                 continue;
2130
2131                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2132                         if (ret)
2133                                 return ret;
2134
2135                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2136                         break;
2137                 }
2138         }
2139
2140         return ret;
2141 }
2142 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2143
2144 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2145                                   int cmd, bool fe_first)
2146 {
2147         struct snd_soc_pcm_runtime *fe = substream->private_data;
2148         int ret;
2149
2150         /* call trigger on the frontend before the backend. */
2151         if (fe_first) {
2152                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2153                         fe->dai_link->name, cmd);
2154
2155                 ret = soc_pcm_trigger(substream, cmd);
2156                 if (ret < 0)
2157                         return ret;
2158
2159                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2160                 return ret;
2161         }
2162
2163         /* call trigger on the frontend after the backend. */
2164         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2165         if (ret < 0)
2166                 return ret;
2167
2168         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2169                 fe->dai_link->name, cmd);
2170
2171         ret = soc_pcm_trigger(substream, cmd);
2172
2173         return ret;
2174 }
2175
2176 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2177 {
2178         struct snd_soc_pcm_runtime *fe = substream->private_data;
2179         int stream = substream->stream;
2180         int ret = 0;
2181         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2182
2183         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2184
2185         switch (trigger) {
2186         case SND_SOC_DPCM_TRIGGER_PRE:
2187                 switch (cmd) {
2188                 case SNDRV_PCM_TRIGGER_START:
2189                 case SNDRV_PCM_TRIGGER_RESUME:
2190                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2191                 case SNDRV_PCM_TRIGGER_DRAIN:
2192                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2193                         break;
2194                 case SNDRV_PCM_TRIGGER_STOP:
2195                 case SNDRV_PCM_TRIGGER_SUSPEND:
2196                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2197                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2198                         break;
2199                 default:
2200                         ret = -EINVAL;
2201                         break;
2202                 }
2203                 break;
2204         case SND_SOC_DPCM_TRIGGER_POST:
2205                 switch (cmd) {
2206                 case SNDRV_PCM_TRIGGER_START:
2207                 case SNDRV_PCM_TRIGGER_RESUME:
2208                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2209                 case SNDRV_PCM_TRIGGER_DRAIN:
2210                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2211                         break;
2212                 case SNDRV_PCM_TRIGGER_STOP:
2213                 case SNDRV_PCM_TRIGGER_SUSPEND:
2214                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2215                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2216                         break;
2217                 default:
2218                         ret = -EINVAL;
2219                         break;
2220                 }
2221                 break;
2222         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2223                 /* bespoke trigger() - handles both FE and BEs */
2224
2225                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2226                                 fe->dai_link->name, cmd);
2227
2228                 ret = soc_pcm_bespoke_trigger(substream, cmd);
2229                 break;
2230         default:
2231                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2232                                 fe->dai_link->name);
2233                 ret = -EINVAL;
2234                 goto out;
2235         }
2236
2237         if (ret < 0) {
2238                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2239                         cmd, ret);
2240                 goto out;
2241         }
2242
2243         switch (cmd) {
2244         case SNDRV_PCM_TRIGGER_START:
2245         case SNDRV_PCM_TRIGGER_RESUME:
2246         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2247                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2248                 break;
2249         case SNDRV_PCM_TRIGGER_STOP:
2250         case SNDRV_PCM_TRIGGER_SUSPEND:
2251                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2252                 break;
2253         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2254                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2255                 break;
2256         }
2257
2258 out:
2259         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2260         return ret;
2261 }
2262
2263 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2264 {
2265         struct snd_soc_pcm_runtime *fe = substream->private_data;
2266         int stream = substream->stream;
2267
2268         /* if FE's runtime_update is already set, we're in race;
2269          * process this trigger later at exit
2270          */
2271         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2272                 fe->dpcm[stream].trigger_pending = cmd + 1;
2273                 return 0; /* delayed, assuming it's successful */
2274         }
2275
2276         /* we're alone, let's trigger */
2277         return dpcm_fe_dai_do_trigger(substream, cmd);
2278 }
2279
2280 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2281 {
2282         struct snd_soc_dpcm *dpcm;
2283         int ret = 0;
2284
2285         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2286
2287                 struct snd_soc_pcm_runtime *be = dpcm->be;
2288                 struct snd_pcm_substream *be_substream =
2289                         snd_soc_dpcm_get_substream(be, stream);
2290
2291                 /* is this op for this BE ? */
2292                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2293                         continue;
2294
2295                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2296                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2297                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2298                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2299                         continue;
2300
2301                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2302                         be->dai_link->name);
2303
2304                 ret = soc_pcm_prepare(be_substream);
2305                 if (ret < 0) {
2306                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2307                                 ret);
2308                         break;
2309                 }
2310
2311                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2312         }
2313         return ret;
2314 }
2315
2316 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2317 {
2318         struct snd_soc_pcm_runtime *fe = substream->private_data;
2319         int stream = substream->stream, ret = 0;
2320
2321         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2322
2323         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2324
2325         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2326
2327         /* there is no point preparing this FE if there are no BEs */
2328         if (list_empty(&fe->dpcm[stream].be_clients)) {
2329                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2330                                 fe->dai_link->name);
2331                 ret = -EINVAL;
2332                 goto out;
2333         }
2334
2335         ret = dpcm_be_dai_prepare(fe, substream->stream);
2336         if (ret < 0)
2337                 goto out;
2338
2339         /* call prepare on the frontend */
2340         ret = soc_pcm_prepare(substream);
2341         if (ret < 0) {
2342                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2343                         fe->dai_link->name);
2344                 goto out;
2345         }
2346
2347         /* run the stream event for each BE */
2348         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2349         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2350
2351 out:
2352         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2353         mutex_unlock(&fe->card->mutex);
2354
2355         return ret;
2356 }
2357
2358 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2359                      unsigned int cmd, void *arg)
2360 {
2361         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2362         struct snd_soc_platform *platform = rtd->platform;
2363
2364         if (platform->driver->ops && platform->driver->ops->ioctl)
2365                 return platform->driver->ops->ioctl(substream, cmd, arg);
2366         return snd_pcm_lib_ioctl(substream, cmd, arg);
2367 }
2368
2369 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2370 {
2371         struct snd_pcm_substream *substream =
2372                 snd_soc_dpcm_get_substream(fe, stream);
2373         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2374         int err;
2375
2376         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2377                         stream ? "capture" : "playback", fe->dai_link->name);
2378
2379         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2380                 /* call bespoke trigger - FE takes care of all BE triggers */
2381                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2382                                 fe->dai_link->name);
2383
2384                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2385                 if (err < 0)
2386                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2387         } else {
2388                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2389                         fe->dai_link->name);
2390
2391                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2392                 if (err < 0)
2393                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2394         }
2395
2396         err = dpcm_be_dai_hw_free(fe, stream);
2397         if (err < 0)
2398                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2399
2400         err = dpcm_be_dai_shutdown(fe, stream);
2401         if (err < 0)
2402                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2403
2404         /* run the stream event for each BE */
2405         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2406
2407         return 0;
2408 }
2409
2410 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2411 {
2412         struct snd_pcm_substream *substream =
2413                 snd_soc_dpcm_get_substream(fe, stream);
2414         struct snd_soc_dpcm *dpcm;
2415         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2416         int ret;
2417
2418         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2419                         stream ? "capture" : "playback", fe->dai_link->name);
2420
2421         /* Only start the BE if the FE is ready */
2422         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2423                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2424                 return -EINVAL;
2425
2426         /* startup must always be called for new BEs */
2427         ret = dpcm_be_dai_startup(fe, stream);
2428         if (ret < 0)
2429                 goto disconnect;
2430
2431         /* keep going if FE state is > open */
2432         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2433                 return 0;
2434
2435         ret = dpcm_be_dai_hw_params(fe, stream);
2436         if (ret < 0)
2437                 goto close;
2438
2439         /* keep going if FE state is > hw_params */
2440         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2441                 return 0;
2442
2443
2444         ret = dpcm_be_dai_prepare(fe, stream);
2445         if (ret < 0)
2446                 goto hw_free;
2447
2448         /* run the stream event for each BE */
2449         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2450
2451         /* keep going if FE state is > prepare */
2452         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2453                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2454                 return 0;
2455
2456         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2457                 /* call trigger on the frontend - FE takes care of all BE triggers */
2458                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2459                                 fe->dai_link->name);
2460
2461                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2462                 if (ret < 0) {
2463                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2464                         goto hw_free;
2465                 }
2466         } else {
2467                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2468                         fe->dai_link->name);
2469
2470                 ret = dpcm_be_dai_trigger(fe, stream,
2471                                         SNDRV_PCM_TRIGGER_START);
2472                 if (ret < 0) {
2473                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2474                         goto hw_free;
2475                 }
2476         }
2477
2478         return 0;
2479
2480 hw_free:
2481         dpcm_be_dai_hw_free(fe, stream);
2482 close:
2483         dpcm_be_dai_shutdown(fe, stream);
2484 disconnect:
2485         /* disconnect any non started BEs */
2486         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2487                 struct snd_soc_pcm_runtime *be = dpcm->be;
2488                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2489                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2490         }
2491
2492         return ret;
2493 }
2494
2495 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2496 {
2497         int ret;
2498
2499         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2500         ret = dpcm_run_update_startup(fe, stream);
2501         if (ret < 0)
2502                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2503         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2504
2505         return ret;
2506 }
2507
2508 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2509 {
2510         int ret;
2511
2512         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2513         ret = dpcm_run_update_shutdown(fe, stream);
2514         if (ret < 0)
2515                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2516         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2517
2518         return ret;
2519 }
2520
2521 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2522  * any DAI links.
2523  */
2524 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2525 {
2526         struct snd_soc_pcm_runtime *fe;
2527         int old, new, paths;
2528
2529         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2530         list_for_each_entry(fe, &card->rtd_list, list) {
2531                 struct snd_soc_dapm_widget_list *list;
2532
2533                 /* make sure link is FE */
2534                 if (!fe->dai_link->dynamic)
2535                         continue;
2536
2537                 /* only check active links */
2538                 if (!fe->cpu_dai->active)
2539                         continue;
2540
2541                 /* DAPM sync will call this to update DSP paths */
2542                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2543                         fe->dai_link->name);
2544
2545                 /* skip if FE doesn't have playback capability */
2546                 if (!fe->cpu_dai->driver->playback.channels_min
2547                     || !fe->codec_dai->driver->playback.channels_min)
2548                         goto capture;
2549
2550                 /* skip if FE isn't currently playing */
2551                 if (!fe->cpu_dai->playback_active
2552                     || !fe->codec_dai->playback_active)
2553                         goto capture;
2554
2555                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2556                 if (paths < 0) {
2557                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2558                                         fe->dai_link->name,  "playback");
2559                         mutex_unlock(&card->mutex);
2560                         return paths;
2561                 }
2562
2563                 /* update any new playback paths */
2564                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2565                 if (new) {
2566                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2567                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2568                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2569                 }
2570
2571                 /* update any old playback paths */
2572                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2573                 if (old) {
2574                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2575                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2576                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2577                 }
2578
2579                 dpcm_path_put(&list);
2580 capture:
2581                 /* skip if FE doesn't have capture capability */
2582                 if (!fe->cpu_dai->driver->capture.channels_min
2583                     || !fe->codec_dai->driver->capture.channels_min)
2584                         continue;
2585
2586                 /* skip if FE isn't currently capturing */
2587                 if (!fe->cpu_dai->capture_active
2588                     || !fe->codec_dai->capture_active)
2589                         continue;
2590
2591                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2592                 if (paths < 0) {
2593                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2594                                         fe->dai_link->name,  "capture");
2595                         mutex_unlock(&card->mutex);
2596                         return paths;
2597                 }
2598
2599                 /* update any new capture paths */
2600                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2601                 if (new) {
2602                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2603                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2604                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2605                 }
2606
2607                 /* update any old capture paths */
2608                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2609                 if (old) {
2610                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2611                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2612                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2613                 }
2614
2615                 dpcm_path_put(&list);
2616         }
2617
2618         mutex_unlock(&card->mutex);
2619         return 0;
2620 }
2621 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2622 {
2623         struct snd_soc_dpcm *dpcm;
2624         struct list_head *clients =
2625                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2626
2627         list_for_each_entry(dpcm, clients, list_be) {
2628
2629                 struct snd_soc_pcm_runtime *be = dpcm->be;
2630                 int i;
2631
2632                 if (be->dai_link->ignore_suspend)
2633                         continue;
2634
2635                 for (i = 0; i < be->num_codecs; i++) {
2636                         struct snd_soc_dai *dai = be->codec_dais[i];
2637                         struct snd_soc_dai_driver *drv = dai->driver;
2638
2639                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2640                                          be->dai_link->name);
2641
2642                         if (drv->ops && drv->ops->digital_mute &&
2643                                                         dai->playback_active)
2644                                 drv->ops->digital_mute(dai, mute);
2645                 }
2646         }
2647
2648         return 0;
2649 }
2650
2651 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2652 {
2653         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2654         struct snd_soc_dpcm *dpcm;
2655         struct snd_soc_dapm_widget_list *list;
2656         int ret;
2657         int stream = fe_substream->stream;
2658
2659         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2660         fe->dpcm[stream].runtime = fe_substream->runtime;
2661
2662         ret = dpcm_path_get(fe, stream, &list);
2663         if (ret < 0) {
2664                 mutex_unlock(&fe->card->mutex);
2665                 return ret;
2666         } else if (ret == 0) {
2667                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2668                         fe->dai_link->name, stream ? "capture" : "playback");
2669         }
2670
2671         /* calculate valid and active FE <-> BE dpcms */
2672         dpcm_process_paths(fe, stream, &list, 1);
2673
2674         ret = dpcm_fe_dai_startup(fe_substream);
2675         if (ret < 0) {
2676                 /* clean up all links */
2677                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2678                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2679
2680                 dpcm_be_disconnect(fe, stream);
2681                 fe->dpcm[stream].runtime = NULL;
2682         }
2683
2684         dpcm_clear_pending_state(fe, stream);
2685         dpcm_path_put(&list);
2686         mutex_unlock(&fe->card->mutex);
2687         return ret;
2688 }
2689
2690 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2691 {
2692         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2693         struct snd_soc_dpcm *dpcm;
2694         int stream = fe_substream->stream, ret;
2695
2696         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2697         ret = dpcm_fe_dai_shutdown(fe_substream);
2698
2699         /* mark FE's links ready to prune */
2700         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2701                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2702
2703         dpcm_be_disconnect(fe, stream);
2704
2705         fe->dpcm[stream].runtime = NULL;
2706         mutex_unlock(&fe->card->mutex);
2707         return ret;
2708 }
2709
2710 /* create a new pcm */
2711 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2712 {
2713         struct snd_soc_platform *platform = rtd->platform;
2714         struct snd_soc_dai *codec_dai;
2715         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2716         struct snd_pcm *pcm;
2717         char new_name[64];
2718         int ret = 0, playback = 0, capture = 0;
2719         int i;
2720
2721         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2722                 playback = rtd->dai_link->dpcm_playback;
2723                 capture = rtd->dai_link->dpcm_capture;
2724         } else {
2725                 for (i = 0; i < rtd->num_codecs; i++) {
2726                         codec_dai = rtd->codec_dais[i];
2727                         if (codec_dai->driver->playback.channels_min)
2728                                 playback = 1;
2729                         if (codec_dai->driver->capture.channels_min)
2730                                 capture = 1;
2731                 }
2732
2733                 capture = capture && cpu_dai->driver->capture.channels_min;
2734                 playback = playback && cpu_dai->driver->playback.channels_min;
2735         }
2736
2737         if (rtd->dai_link->playback_only) {
2738                 playback = 1;
2739                 capture = 0;
2740         }
2741
2742         if (rtd->dai_link->capture_only) {
2743                 playback = 0;
2744                 capture = 1;
2745         }
2746
2747         /* create the PCM */
2748         if (rtd->dai_link->no_pcm) {
2749                 snprintf(new_name, sizeof(new_name), "(%s)",
2750                         rtd->dai_link->stream_name);
2751
2752                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2753                                 playback, capture, &pcm);
2754         } else {
2755                 if (rtd->dai_link->dynamic)
2756                         snprintf(new_name, sizeof(new_name), "%s (*)",
2757                                 rtd->dai_link->stream_name);
2758                 else
2759                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2760                                 rtd->dai_link->stream_name,
2761                                 (rtd->num_codecs > 1) ?
2762                                 "multicodec" : rtd->codec_dai->name, num);
2763
2764                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2765                         capture, &pcm);
2766         }
2767         if (ret < 0) {
2768                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2769                         rtd->dai_link->name);
2770                 return ret;
2771         }
2772         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2773
2774         /* DAPM dai link stream work */
2775         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2776
2777         pcm->nonatomic = rtd->dai_link->nonatomic;
2778         rtd->pcm = pcm;
2779         pcm->private_data = rtd;
2780
2781         if (rtd->dai_link->no_pcm) {
2782                 if (playback)
2783                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2784                 if (capture)
2785                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2786                 goto out;
2787         }
2788
2789         /* ASoC PCM operations */
2790         if (rtd->dai_link->dynamic) {
2791                 rtd->ops.open           = dpcm_fe_dai_open;
2792                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2793                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2794                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2795                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2796                 rtd->ops.close          = dpcm_fe_dai_close;
2797                 rtd->ops.pointer        = soc_pcm_pointer;
2798                 rtd->ops.ioctl          = soc_pcm_ioctl;
2799         } else {
2800                 rtd->ops.open           = soc_pcm_open;
2801                 rtd->ops.hw_params      = soc_pcm_hw_params;
2802                 rtd->ops.prepare        = soc_pcm_prepare;
2803                 rtd->ops.trigger        = soc_pcm_trigger;
2804                 rtd->ops.hw_free        = soc_pcm_hw_free;
2805                 rtd->ops.close          = soc_pcm_close;
2806                 rtd->ops.pointer        = soc_pcm_pointer;
2807                 rtd->ops.ioctl          = soc_pcm_ioctl;
2808         }
2809
2810         if (platform->driver->ops) {
2811                 rtd->ops.ack            = platform->driver->ops->ack;
2812                 rtd->ops.copy           = platform->driver->ops->copy;
2813                 rtd->ops.silence        = platform->driver->ops->silence;
2814                 rtd->ops.page           = platform->driver->ops->page;
2815                 rtd->ops.mmap           = platform->driver->ops->mmap;
2816         }
2817
2818         if (playback)
2819                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2820
2821         if (capture)
2822                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2823
2824         if (platform->driver->pcm_new) {
2825                 ret = platform->driver->pcm_new(rtd);
2826                 if (ret < 0) {
2827                         dev_err(platform->dev,
2828                                 "ASoC: pcm constructor failed: %d\n",
2829                                 ret);
2830                         return ret;
2831                 }
2832         }
2833
2834         pcm->private_free = platform->driver->pcm_free;
2835 out:
2836         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2837                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2838                  cpu_dai->name);
2839         return ret;
2840 }
2841
2842 /* is the current PCM operation for this FE ? */
2843 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2844 {
2845         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2846                 return 1;
2847         return 0;
2848 }
2849 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2850
2851 /* is the current PCM operation for this BE ? */
2852 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2853                 struct snd_soc_pcm_runtime *be, int stream)
2854 {
2855         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2856            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2857                   be->dpcm[stream].runtime_update))
2858                 return 1;
2859         return 0;
2860 }
2861 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2862
2863 /* get the substream for this BE */
2864 struct snd_pcm_substream *
2865         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2866 {
2867         return be->pcm->streams[stream].substream;
2868 }
2869 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2870
2871 /* get the BE runtime state */
2872 enum snd_soc_dpcm_state
2873         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2874 {
2875         return be->dpcm[stream].state;
2876 }
2877 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2878
2879 /* set the BE runtime state */
2880 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2881                 int stream, enum snd_soc_dpcm_state state)
2882 {
2883         be->dpcm[stream].state = state;
2884 }
2885 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2886
2887 /*
2888  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2889  * are not running, paused or suspended for the specified stream direction.
2890  */
2891 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2892                 struct snd_soc_pcm_runtime *be, int stream)
2893 {
2894         struct snd_soc_dpcm *dpcm;
2895         int state;
2896
2897         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2898
2899                 if (dpcm->fe == fe)
2900                         continue;
2901
2902                 state = dpcm->fe->dpcm[stream].state;
2903                 if (state == SND_SOC_DPCM_STATE_START ||
2904                         state == SND_SOC_DPCM_STATE_PAUSED ||
2905                         state == SND_SOC_DPCM_STATE_SUSPEND)
2906                         return 0;
2907         }
2908
2909         /* it's safe to free/stop this BE DAI */
2910         return 1;
2911 }
2912 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2913
2914 /*
2915  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2916  * running, paused or suspended for the specified stream direction.
2917  */
2918 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2919                 struct snd_soc_pcm_runtime *be, int stream)
2920 {
2921         struct snd_soc_dpcm *dpcm;
2922         int state;
2923
2924         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2925
2926                 if (dpcm->fe == fe)
2927                         continue;
2928
2929                 state = dpcm->fe->dpcm[stream].state;
2930                 if (state == SND_SOC_DPCM_STATE_START ||
2931                         state == SND_SOC_DPCM_STATE_PAUSED ||
2932                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2933                         state == SND_SOC_DPCM_STATE_PREPARE)
2934                         return 0;
2935         }
2936
2937         /* it's safe to change hw_params */
2938         return 1;
2939 }
2940 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2941
2942 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2943                 int cmd, struct snd_soc_platform *platform)
2944 {
2945         if (platform->driver->ops && platform->driver->ops->trigger)
2946                 return platform->driver->ops->trigger(substream, cmd);
2947         return 0;
2948 }
2949 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2950
2951 #ifdef CONFIG_DEBUG_FS
2952 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2953 {
2954         switch (state) {
2955         case SND_SOC_DPCM_STATE_NEW:
2956                 return "new";
2957         case SND_SOC_DPCM_STATE_OPEN:
2958                 return "open";
2959         case SND_SOC_DPCM_STATE_HW_PARAMS:
2960                 return "hw_params";
2961         case SND_SOC_DPCM_STATE_PREPARE:
2962                 return "prepare";
2963         case SND_SOC_DPCM_STATE_START:
2964                 return "start";
2965         case SND_SOC_DPCM_STATE_STOP:
2966                 return "stop";
2967         case SND_SOC_DPCM_STATE_SUSPEND:
2968                 return "suspend";
2969         case SND_SOC_DPCM_STATE_PAUSED:
2970                 return "paused";
2971         case SND_SOC_DPCM_STATE_HW_FREE:
2972                 return "hw_free";
2973         case SND_SOC_DPCM_STATE_CLOSE:
2974                 return "close";
2975         }
2976
2977         return "unknown";
2978 }
2979
2980 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2981                                 int stream, char *buf, size_t size)
2982 {
2983         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2984         struct snd_soc_dpcm *dpcm;
2985         ssize_t offset = 0;
2986
2987         /* FE state */
2988         offset += scnprintf(buf + offset, size - offset,
2989                         "[%s - %s]\n", fe->dai_link->name,
2990                         stream ? "Capture" : "Playback");
2991
2992         offset += scnprintf(buf + offset, size - offset, "State: %s\n",
2993                         dpcm_state_string(fe->dpcm[stream].state));
2994
2995         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2996             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2997                 offset += scnprintf(buf + offset, size - offset,
2998                                 "Hardware Params: "
2999                                 "Format = %s, Channels = %d, Rate = %d\n",
3000                                 snd_pcm_format_name(params_format(params)),
3001                                 params_channels(params),
3002                                 params_rate(params));
3003
3004         /* BEs state */
3005         offset += scnprintf(buf + offset, size - offset, "Backends:\n");
3006
3007         if (list_empty(&fe->dpcm[stream].be_clients)) {
3008                 offset += scnprintf(buf + offset, size - offset,
3009                                 " No active DSP links\n");
3010                 goto out;
3011         }
3012
3013         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
3014                 struct snd_soc_pcm_runtime *be = dpcm->be;
3015                 params = &dpcm->hw_params;
3016
3017                 offset += scnprintf(buf + offset, size - offset,
3018                                 "- %s\n", be->dai_link->name);
3019
3020                 offset += scnprintf(buf + offset, size - offset,
3021                                 "   State: %s\n",
3022                                 dpcm_state_string(be->dpcm[stream].state));
3023
3024                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
3025                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
3026                         offset += scnprintf(buf + offset, size - offset,
3027                                 "   Hardware Params: "
3028                                 "Format = %s, Channels = %d, Rate = %d\n",
3029                                 snd_pcm_format_name(params_format(params)),
3030                                 params_channels(params),
3031                                 params_rate(params));
3032         }
3033
3034 out:
3035         return offset;
3036 }
3037
3038 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
3039                                 size_t count, loff_t *ppos)
3040 {
3041         struct snd_soc_pcm_runtime *fe = file->private_data;
3042         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
3043         char *buf;
3044
3045         buf = kmalloc(out_count, GFP_KERNEL);
3046         if (!buf)
3047                 return -ENOMEM;
3048
3049         if (fe->cpu_dai->driver->playback.channels_min)
3050                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
3051                                         buf + offset, out_count - offset);
3052
3053         if (fe->cpu_dai->driver->capture.channels_min)
3054                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
3055                                         buf + offset, out_count - offset);
3056
3057         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
3058
3059         kfree(buf);
3060         return ret;
3061 }
3062
3063 static const struct file_operations dpcm_state_fops = {
3064         .open = simple_open,
3065         .read = dpcm_state_read_file,
3066         .llseek = default_llseek,
3067 };
3068
3069 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
3070 {
3071         if (!rtd->dai_link)
3072                 return;
3073
3074         if (!rtd->card->debugfs_card_root)
3075                 return;
3076
3077         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
3078                         rtd->card->debugfs_card_root);
3079         if (!rtd->debugfs_dpcm_root) {
3080                 dev_dbg(rtd->dev,
3081                          "ASoC: Failed to create dpcm debugfs directory %s\n",
3082                          rtd->dai_link->name);
3083                 return;
3084         }
3085
3086         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
3087                                                 rtd->debugfs_dpcm_root,
3088                                                 rtd, &dpcm_state_fops);
3089 }
3090 #endif