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
1186         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1187                 if (dpcm->fe == fe)
1188                         continue;
1189
1190                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1191                         stream ? "capture" : "playback",
1192                         dpcm->fe->dai_link->name,
1193                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1194
1195                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1196                 be_substream->runtime = fe_substream->runtime;
1197                 break;
1198         }
1199 }
1200
1201 /* disconnect a BE and FE */
1202 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1203 {
1204         struct snd_soc_dpcm *dpcm, *d;
1205
1206         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1207                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1208                                 stream ? "capture" : "playback",
1209                                 dpcm->be->dai_link->name);
1210
1211                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1212                         continue;
1213
1214                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1215                         stream ? "capture" : "playback", fe->dai_link->name,
1216                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1217
1218                 /* BEs still alive need new FE */
1219                 dpcm_be_reparent(fe, dpcm->be, stream);
1220
1221 #ifdef CONFIG_DEBUG_FS
1222                 debugfs_remove(dpcm->debugfs_state);
1223 #endif
1224                 list_del(&dpcm->list_be);
1225                 list_del(&dpcm->list_fe);
1226                 kfree(dpcm);
1227         }
1228 }
1229
1230 /* get BE for DAI widget and stream */
1231 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1232                 struct snd_soc_dapm_widget *widget, int stream)
1233 {
1234         struct snd_soc_pcm_runtime *be;
1235         int i;
1236
1237         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1238                 list_for_each_entry(be, &card->rtd_list, list) {
1239
1240                         if (!be->dai_link->no_pcm)
1241                                 continue;
1242
1243                         if (be->cpu_dai->playback_widget == widget)
1244                                 return be;
1245
1246                         for (i = 0; i < be->num_codecs; i++) {
1247                                 struct snd_soc_dai *dai = be->codec_dais[i];
1248                                 if (dai->playback_widget == widget)
1249                                         return be;
1250                         }
1251                 }
1252         } else {
1253
1254                 list_for_each_entry(be, &card->rtd_list, list) {
1255
1256                         if (!be->dai_link->no_pcm)
1257                                 continue;
1258
1259                         if (be->cpu_dai->capture_widget == widget)
1260                                 return be;
1261
1262                         for (i = 0; i < be->num_codecs; i++) {
1263                                 struct snd_soc_dai *dai = be->codec_dais[i];
1264                                 if (dai->capture_widget == widget)
1265                                         return be;
1266                         }
1267                 }
1268         }
1269
1270         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1271                 stream ? "capture" : "playback", widget->name);
1272         return NULL;
1273 }
1274
1275 static inline struct snd_soc_dapm_widget *
1276         dai_get_widget(struct snd_soc_dai *dai, int stream)
1277 {
1278         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1279                 return dai->playback_widget;
1280         else
1281                 return dai->capture_widget;
1282 }
1283
1284 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1285                 struct snd_soc_dapm_widget *widget)
1286 {
1287         int i;
1288
1289         for (i = 0; i < list->num_widgets; i++) {
1290                 if (widget == list->widgets[i])
1291                         return 1;
1292         }
1293
1294         return 0;
1295 }
1296
1297 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1298                 enum snd_soc_dapm_direction dir)
1299 {
1300         struct snd_soc_card *card = widget->dapm->card;
1301         struct snd_soc_pcm_runtime *rtd;
1302         int i;
1303
1304         if (dir == SND_SOC_DAPM_DIR_OUT) {
1305                 list_for_each_entry(rtd, &card->rtd_list, list) {
1306                         if (!rtd->dai_link->no_pcm)
1307                                 continue;
1308
1309                         if (rtd->cpu_dai->playback_widget == widget)
1310                                 return true;
1311
1312                         for (i = 0; i < rtd->num_codecs; ++i) {
1313                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1314                                 if (dai->playback_widget == widget)
1315                                         return true;
1316                         }
1317                 }
1318         } else { /* SND_SOC_DAPM_DIR_IN */
1319                 list_for_each_entry(rtd, &card->rtd_list, list) {
1320                         if (!rtd->dai_link->no_pcm)
1321                                 continue;
1322
1323                         if (rtd->cpu_dai->capture_widget == widget)
1324                                 return true;
1325
1326                         for (i = 0; i < rtd->num_codecs; ++i) {
1327                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1328                                 if (dai->capture_widget == widget)
1329                                         return true;
1330                         }
1331                 }
1332         }
1333
1334         return false;
1335 }
1336
1337 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1338         int stream, struct snd_soc_dapm_widget_list **list)
1339 {
1340         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1341         int paths;
1342
1343         /* get number of valid DAI paths and their widgets */
1344         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1345                         dpcm_end_walk_at_be);
1346
1347         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1348                         stream ? "capture" : "playback");
1349
1350         return paths;
1351 }
1352
1353 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1354         struct snd_soc_dapm_widget_list **list_)
1355 {
1356         struct snd_soc_dpcm *dpcm;
1357         struct snd_soc_dapm_widget_list *list = *list_;
1358         struct snd_soc_dapm_widget *widget;
1359         int prune = 0;
1360
1361         /* Destroy any old FE <--> BE connections */
1362         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1363                 unsigned int i;
1364
1365                 /* is there a valid CPU DAI widget for this BE */
1366                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1367
1368                 /* prune the BE if it's no longer in our active list */
1369                 if (widget && widget_in_list(list, widget))
1370                         continue;
1371
1372                 /* is there a valid CODEC DAI widget for this BE */
1373                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1374                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1375                         widget = dai_get_widget(dai, stream);
1376
1377                         /* prune the BE if it's no longer in our active list */
1378                         if (widget && widget_in_list(list, widget))
1379                                 continue;
1380                 }
1381
1382                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1383                         stream ? "capture" : "playback",
1384                         dpcm->be->dai_link->name, fe->dai_link->name);
1385                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1386                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1387                 prune++;
1388         }
1389
1390         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1391         return prune;
1392 }
1393
1394 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1395         struct snd_soc_dapm_widget_list **list_)
1396 {
1397         struct snd_soc_card *card = fe->card;
1398         struct snd_soc_dapm_widget_list *list = *list_;
1399         struct snd_soc_pcm_runtime *be;
1400         int i, new = 0, err;
1401
1402         /* Create any new FE <--> BE connections */
1403         for (i = 0; i < list->num_widgets; i++) {
1404
1405                 switch (list->widgets[i]->id) {
1406                 case snd_soc_dapm_dai_in:
1407                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1408                                 continue;
1409                         break;
1410                 case snd_soc_dapm_dai_out:
1411                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1412                                 continue;
1413                         break;
1414                 default:
1415                         continue;
1416                 }
1417
1418                 /* is there a valid BE rtd for this widget */
1419                 be = dpcm_get_be(card, list->widgets[i], stream);
1420                 if (!be) {
1421                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1422                                         list->widgets[i]->name);
1423                         continue;
1424                 }
1425
1426                 /* make sure BE is a real BE */
1427                 if (!be->dai_link->no_pcm)
1428                         continue;
1429
1430                 /* don't connect if FE is not running */
1431                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1432                         continue;
1433
1434                 /* newly connected FE and BE */
1435                 err = dpcm_be_connect(fe, be, stream);
1436                 if (err < 0) {
1437                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1438                                 list->widgets[i]->name);
1439                         break;
1440                 } else if (err == 0) /* already connected */
1441                         continue;
1442
1443                 /* new */
1444                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1445                 new++;
1446         }
1447
1448         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1449         return new;
1450 }
1451
1452 /*
1453  * Find the corresponding BE DAIs that source or sink audio to this
1454  * FE substream.
1455  */
1456 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1457         int stream, struct snd_soc_dapm_widget_list **list, int new)
1458 {
1459         if (new)
1460                 return dpcm_add_paths(fe, stream, list);
1461         else
1462                 return dpcm_prune_paths(fe, stream, list);
1463 }
1464
1465 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1466 {
1467         struct snd_soc_dpcm *dpcm;
1468
1469         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1470                 dpcm->be->dpcm[stream].runtime_update =
1471                                                 SND_SOC_DPCM_UPDATE_NO;
1472 }
1473
1474 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1475         int stream)
1476 {
1477         struct snd_soc_dpcm *dpcm;
1478
1479         /* disable any enabled and non active backends */
1480         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1481
1482                 struct snd_soc_pcm_runtime *be = dpcm->be;
1483                 struct snd_pcm_substream *be_substream =
1484                         snd_soc_dpcm_get_substream(be, stream);
1485
1486                 if (be->dpcm[stream].users == 0)
1487                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1488                                 stream ? "capture" : "playback",
1489                                 be->dpcm[stream].state);
1490
1491                 if (--be->dpcm[stream].users != 0)
1492                         continue;
1493
1494                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1495                         continue;
1496
1497                 soc_pcm_close(be_substream);
1498                 be_substream->runtime = NULL;
1499                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1500         }
1501 }
1502
1503 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1504 {
1505         struct snd_soc_dpcm *dpcm;
1506         int err, count = 0;
1507
1508         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1509         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1510
1511                 struct snd_soc_pcm_runtime *be = dpcm->be;
1512                 struct snd_pcm_substream *be_substream =
1513                         snd_soc_dpcm_get_substream(be, stream);
1514
1515                 if (!be_substream) {
1516                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1517                                 stream ? "capture" : "playback");
1518                         continue;
1519                 }
1520
1521                 /* is this op for this BE ? */
1522                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1523                         continue;
1524
1525                 /* first time the dpcm is open ? */
1526                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1527                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1528                                 stream ? "capture" : "playback",
1529                                 be->dpcm[stream].state);
1530
1531                 if (be->dpcm[stream].users++ != 0)
1532                         continue;
1533
1534                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1535                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1536                         continue;
1537
1538                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1539                         stream ? "capture" : "playback", be->dai_link->name);
1540
1541                 be_substream->runtime = be->dpcm[stream].runtime;
1542                 err = soc_pcm_open(be_substream);
1543                 if (err < 0) {
1544                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1545                         be->dpcm[stream].users--;
1546                         if (be->dpcm[stream].users < 0)
1547                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1548                                         stream ? "capture" : "playback",
1549                                         be->dpcm[stream].state);
1550
1551                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1552                         goto unwind;
1553                 }
1554
1555                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1556                 count++;
1557         }
1558
1559         return count;
1560
1561 unwind:
1562         /* disable any enabled and non active backends */
1563         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1564                 struct snd_soc_pcm_runtime *be = dpcm->be;
1565                 struct snd_pcm_substream *be_substream =
1566                         snd_soc_dpcm_get_substream(be, stream);
1567
1568                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1569                         continue;
1570
1571                 if (be->dpcm[stream].users == 0)
1572                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1573                                 stream ? "capture" : "playback",
1574                                 be->dpcm[stream].state);
1575
1576                 if (--be->dpcm[stream].users != 0)
1577                         continue;
1578
1579                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1580                         continue;
1581
1582                 soc_pcm_close(be_substream);
1583                 be_substream->runtime = NULL;
1584                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1585         }
1586
1587         return err;
1588 }
1589
1590 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1591                                  struct snd_soc_pcm_stream *stream,
1592                                  u64 formats)
1593 {
1594         runtime->hw.rate_min = stream->rate_min;
1595         runtime->hw.rate_max = min_not_zero(stream->rate_max, UINT_MAX);
1596         runtime->hw.channels_min = stream->channels_min;
1597         runtime->hw.channels_max = stream->channels_max;
1598         if (runtime->hw.formats)
1599                 runtime->hw.formats &= formats & stream->formats;
1600         else
1601                 runtime->hw.formats = formats & stream->formats;
1602         runtime->hw.rates = stream->rates;
1603 }
1604
1605 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1606 {
1607         struct snd_soc_pcm_runtime *fe = substream->private_data;
1608         struct snd_soc_dpcm *dpcm;
1609         u64 formats = ULLONG_MAX;
1610         int stream = substream->stream;
1611
1612         if (!fe->dai_link->dpcm_merged_format)
1613                 return formats;
1614
1615         /*
1616          * It returns merged BE codec format
1617          * if FE want to use it (= dpcm_merged_format)
1618          */
1619
1620         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1621                 struct snd_soc_pcm_runtime *be = dpcm->be;
1622                 struct snd_soc_dai_driver *codec_dai_drv;
1623                 struct snd_soc_pcm_stream *codec_stream;
1624                 int i;
1625
1626                 for (i = 0; i < be->num_codecs; i++) {
1627                         /*
1628                          * Skip CODECs which don't support the current stream
1629                          * type. See soc_pcm_init_runtime_hw() for more details
1630                          */
1631                         if (!snd_soc_dai_stream_valid(be->codec_dais[i],
1632                                                       stream))
1633                                 continue;
1634
1635                         codec_dai_drv = be->codec_dais[i]->driver;
1636                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1637                                 codec_stream = &codec_dai_drv->playback;
1638                         else
1639                                 codec_stream = &codec_dai_drv->capture;
1640
1641                         formats &= codec_stream->formats;
1642                 }
1643         }
1644
1645         return formats;
1646 }
1647
1648 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1649 {
1650         struct snd_pcm_runtime *runtime = substream->runtime;
1651         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1652         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1653         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1654         u64 format = dpcm_runtime_base_format(substream);
1655
1656         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1657                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1658         else
1659                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1660 }
1661
1662 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1663
1664 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1665  * for avoiding the race with trigger callback.
1666  * If the state is unset and a trigger is pending while the previous operation,
1667  * process the pending trigger action here.
1668  */
1669 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1670                                      int stream, enum snd_soc_dpcm_update state)
1671 {
1672         struct snd_pcm_substream *substream =
1673                 snd_soc_dpcm_get_substream(fe, stream);
1674
1675         snd_pcm_stream_lock_irq(substream);
1676         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1677                 dpcm_fe_dai_do_trigger(substream,
1678                                        fe->dpcm[stream].trigger_pending - 1);
1679                 fe->dpcm[stream].trigger_pending = 0;
1680         }
1681         fe->dpcm[stream].runtime_update = state;
1682         snd_pcm_stream_unlock_irq(substream);
1683 }
1684
1685 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1686                                int stream)
1687 {
1688         struct snd_soc_dpcm *dpcm;
1689         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1690         struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1691         int err;
1692
1693         /* apply symmetry for FE */
1694         if (soc_pcm_has_symmetry(fe_substream))
1695                 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1696
1697         /* Symmetry only applies if we've got an active stream. */
1698         if (fe_cpu_dai->active) {
1699                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1700                 if (err < 0)
1701                         return err;
1702         }
1703
1704         /* apply symmetry for BE */
1705         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1706                 struct snd_soc_pcm_runtime *be = dpcm->be;
1707                 struct snd_pcm_substream *be_substream =
1708                         snd_soc_dpcm_get_substream(be, stream);
1709                 struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
1710                 int i;
1711
1712                 if (rtd->dai_link->be_hw_params_fixup)
1713                         continue;
1714
1715                 if (soc_pcm_has_symmetry(be_substream))
1716                         be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1717
1718                 /* Symmetry only applies if we've got an active stream. */
1719                 if (rtd->cpu_dai->active) {
1720                         err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
1721                         if (err < 0)
1722                                 return err;
1723                 }
1724
1725                 for (i = 0; i < rtd->num_codecs; i++) {
1726                         if (rtd->codec_dais[i]->active) {
1727                                 err = soc_pcm_apply_symmetry(be_substream,
1728                                                              rtd->codec_dais[i]);
1729                                 if (err < 0)
1730                                         return err;
1731                         }
1732                 }
1733         }
1734
1735         return 0;
1736 }
1737
1738 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1739 {
1740         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1741         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1742         int stream = fe_substream->stream, ret = 0;
1743
1744         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1745
1746         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1747         if (ret < 0) {
1748                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1749                 goto be_err;
1750         }
1751
1752         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1753
1754         /* start the DAI frontend */
1755         ret = soc_pcm_open(fe_substream);
1756         if (ret < 0) {
1757                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1758                 goto unwind;
1759         }
1760
1761         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1762
1763         dpcm_set_fe_runtime(fe_substream);
1764         snd_pcm_limit_hw_rates(runtime);
1765
1766         ret = dpcm_apply_symmetry(fe_substream, stream);
1767         if (ret < 0) {
1768                 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1769                         ret);
1770                 goto unwind;
1771         }
1772
1773         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1774         return 0;
1775
1776 unwind:
1777         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1778 be_err:
1779         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1780         return ret;
1781 }
1782
1783 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1784 {
1785         struct snd_soc_dpcm *dpcm;
1786
1787         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1788         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1789
1790                 struct snd_soc_pcm_runtime *be = dpcm->be;
1791                 struct snd_pcm_substream *be_substream =
1792                         snd_soc_dpcm_get_substream(be, stream);
1793
1794                 /* is this op for this BE ? */
1795                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1796                         continue;
1797
1798                 if (be->dpcm[stream].users == 0)
1799                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1800                                 stream ? "capture" : "playback",
1801                                 be->dpcm[stream].state);
1802
1803                 if (--be->dpcm[stream].users != 0)
1804                         continue;
1805
1806                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1807                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)) {
1808                         soc_pcm_hw_free(be_substream);
1809                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1810                 }
1811
1812                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1813                         be->dai_link->name);
1814
1815                 soc_pcm_close(be_substream);
1816                 be_substream->runtime = NULL;
1817
1818                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1819         }
1820         return 0;
1821 }
1822
1823 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1824 {
1825         struct snd_soc_pcm_runtime *fe = substream->private_data;
1826         int stream = substream->stream;
1827
1828         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1829
1830         /* shutdown the BEs */
1831         dpcm_be_dai_shutdown(fe, substream->stream);
1832
1833         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1834
1835         /* now shutdown the frontend */
1836         soc_pcm_close(substream);
1837
1838         /* run the stream event for each BE */
1839         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1840
1841         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1842         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1843         return 0;
1844 }
1845
1846 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1847 {
1848         struct snd_soc_dpcm *dpcm;
1849
1850         /* only hw_params backends that are either sinks or sources
1851          * to this frontend DAI */
1852         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1853
1854                 struct snd_soc_pcm_runtime *be = dpcm->be;
1855                 struct snd_pcm_substream *be_substream =
1856                         snd_soc_dpcm_get_substream(be, stream);
1857
1858                 /* is this op for this BE ? */
1859                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1860                         continue;
1861
1862                 /* only free hw when no longer used - check all FEs */
1863                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1864                                 continue;
1865
1866                 /* do not free hw if this BE is used by other FE */
1867                 if (be->dpcm[stream].users > 1)
1868                         continue;
1869
1870                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1871                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1872                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1873                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1874                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1875                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1876                         continue;
1877
1878                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1879                         be->dai_link->name);
1880
1881                 soc_pcm_hw_free(be_substream);
1882
1883                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1884         }
1885
1886         return 0;
1887 }
1888
1889 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1890 {
1891         struct snd_soc_pcm_runtime *fe = substream->private_data;
1892         int err, stream = substream->stream;
1893
1894         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1895         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1896
1897         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1898
1899         /* call hw_free on the frontend */
1900         err = soc_pcm_hw_free(substream);
1901         if (err < 0)
1902                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1903                         fe->dai_link->name);
1904
1905         /* only hw_params backends that are either sinks or sources
1906          * to this frontend DAI */
1907         err = dpcm_be_dai_hw_free(fe, stream);
1908
1909         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1910         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1911
1912         mutex_unlock(&fe->card->mutex);
1913         return 0;
1914 }
1915
1916 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1917 {
1918         struct snd_soc_dpcm *dpcm;
1919         int ret;
1920
1921         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1922
1923                 struct snd_soc_pcm_runtime *be = dpcm->be;
1924                 struct snd_pcm_substream *be_substream =
1925                         snd_soc_dpcm_get_substream(be, stream);
1926
1927                 /* is this op for this BE ? */
1928                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1929                         continue;
1930
1931                 /* copy params for each dpcm */
1932                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1933                                 sizeof(struct snd_pcm_hw_params));
1934
1935                 /* perform any hw_params fixups */
1936                 if (be->dai_link->be_hw_params_fixup) {
1937                         ret = be->dai_link->be_hw_params_fixup(be,
1938                                         &dpcm->hw_params);
1939                         if (ret < 0) {
1940                                 dev_err(be->dev,
1941                                         "ASoC: hw_params BE fixup failed %d\n",
1942                                         ret);
1943                                 goto unwind;
1944                         }
1945                 }
1946
1947                 /* only allow hw_params() if no connected FEs are running */
1948                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1949                         continue;
1950
1951                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1952                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1953                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1954                         continue;
1955
1956                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1957                         be->dai_link->name);
1958
1959                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1960                 if (ret < 0) {
1961                         dev_err(dpcm->be->dev,
1962                                 "ASoC: hw_params BE failed %d\n", ret);
1963                         goto unwind;
1964                 }
1965
1966                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1967         }
1968         return 0;
1969
1970 unwind:
1971         /* disable any enabled and non active backends */
1972         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1973                 struct snd_soc_pcm_runtime *be = dpcm->be;
1974                 struct snd_pcm_substream *be_substream =
1975                         snd_soc_dpcm_get_substream(be, stream);
1976
1977                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1978                         continue;
1979
1980                 /* only allow hw_free() if no connected FEs are running */
1981                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1982                         continue;
1983
1984                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1985                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1986                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1987                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1988                         continue;
1989
1990                 soc_pcm_hw_free(be_substream);
1991         }
1992
1993         return ret;
1994 }
1995
1996 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1997                                  struct snd_pcm_hw_params *params)
1998 {
1999         struct snd_soc_pcm_runtime *fe = substream->private_data;
2000         int ret, stream = substream->stream;
2001
2002         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2003         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2004
2005         memcpy(&fe->dpcm[substream->stream].hw_params, params,
2006                         sizeof(struct snd_pcm_hw_params));
2007         ret = dpcm_be_dai_hw_params(fe, substream->stream);
2008         if (ret < 0) {
2009                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
2010                 goto out;
2011         }
2012
2013         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2014                         fe->dai_link->name, params_rate(params),
2015                         params_channels(params), params_format(params));
2016
2017         /* call hw_params on the frontend */
2018         ret = soc_pcm_hw_params(substream, params);
2019         if (ret < 0) {
2020                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
2021                 dpcm_be_dai_hw_free(fe, stream);
2022          } else
2023                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2024
2025 out:
2026         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2027         mutex_unlock(&fe->card->mutex);
2028         return ret;
2029 }
2030
2031 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2032                 struct snd_pcm_substream *substream, int cmd)
2033 {
2034         int ret;
2035
2036         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2037                         dpcm->be->dai_link->name, cmd);
2038
2039         ret = soc_pcm_trigger(substream, cmd);
2040         if (ret < 0)
2041                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2042
2043         return ret;
2044 }
2045
2046 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2047                                int cmd)
2048 {
2049         struct snd_soc_dpcm *dpcm;
2050         int ret = 0;
2051
2052         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2053
2054                 struct snd_soc_pcm_runtime *be = dpcm->be;
2055                 struct snd_pcm_substream *be_substream =
2056                         snd_soc_dpcm_get_substream(be, stream);
2057
2058                 /* is this op for this BE ? */
2059                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2060                         continue;
2061
2062                 switch (cmd) {
2063                 case SNDRV_PCM_TRIGGER_START:
2064                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2065                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2066                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2067                                 continue;
2068
2069                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2070                         if (ret)
2071                                 return ret;
2072
2073                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2074                         break;
2075                 case SNDRV_PCM_TRIGGER_RESUME:
2076                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2077                                 continue;
2078
2079                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2080                         if (ret)
2081                                 return ret;
2082
2083                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2084                         break;
2085                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2086                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2087                                 continue;
2088
2089                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2090                         if (ret)
2091                                 return ret;
2092
2093                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2094                         break;
2095                 case SNDRV_PCM_TRIGGER_STOP:
2096                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2097                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2098                                 continue;
2099
2100                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2101                                 continue;
2102
2103                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2104                         if (ret)
2105                                 return ret;
2106
2107                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2108                         break;
2109                 case SNDRV_PCM_TRIGGER_SUSPEND:
2110                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2111                                 continue;
2112
2113                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2114                                 continue;
2115
2116                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2117                         if (ret)
2118                                 return ret;
2119
2120                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2121                         break;
2122                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2123                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2124                                 continue;
2125
2126                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2127                                 continue;
2128
2129                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2130                         if (ret)
2131                                 return ret;
2132
2133                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2134                         break;
2135                 }
2136         }
2137
2138         return ret;
2139 }
2140 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2141
2142 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2143                                   int cmd, bool fe_first)
2144 {
2145         struct snd_soc_pcm_runtime *fe = substream->private_data;
2146         int ret;
2147
2148         /* call trigger on the frontend before the backend. */
2149         if (fe_first) {
2150                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2151                         fe->dai_link->name, cmd);
2152
2153                 ret = soc_pcm_trigger(substream, cmd);
2154                 if (ret < 0)
2155                         return ret;
2156
2157                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2158                 return ret;
2159         }
2160
2161         /* call trigger on the frontend after the backend. */
2162         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2163         if (ret < 0)
2164                 return ret;
2165
2166         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2167                 fe->dai_link->name, cmd);
2168
2169         ret = soc_pcm_trigger(substream, cmd);
2170
2171         return ret;
2172 }
2173
2174 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2175 {
2176         struct snd_soc_pcm_runtime *fe = substream->private_data;
2177         int stream = substream->stream;
2178         int ret = 0;
2179         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2180
2181         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2182
2183         switch (trigger) {
2184         case SND_SOC_DPCM_TRIGGER_PRE:
2185                 switch (cmd) {
2186                 case SNDRV_PCM_TRIGGER_START:
2187                 case SNDRV_PCM_TRIGGER_RESUME:
2188                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2189                 case SNDRV_PCM_TRIGGER_DRAIN:
2190                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2191                         break;
2192                 case SNDRV_PCM_TRIGGER_STOP:
2193                 case SNDRV_PCM_TRIGGER_SUSPEND:
2194                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2195                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2196                         break;
2197                 default:
2198                         ret = -EINVAL;
2199                         break;
2200                 }
2201                 break;
2202         case SND_SOC_DPCM_TRIGGER_POST:
2203                 switch (cmd) {
2204                 case SNDRV_PCM_TRIGGER_START:
2205                 case SNDRV_PCM_TRIGGER_RESUME:
2206                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2207                 case SNDRV_PCM_TRIGGER_DRAIN:
2208                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2209                         break;
2210                 case SNDRV_PCM_TRIGGER_STOP:
2211                 case SNDRV_PCM_TRIGGER_SUSPEND:
2212                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2213                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2214                         break;
2215                 default:
2216                         ret = -EINVAL;
2217                         break;
2218                 }
2219                 break;
2220         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2221                 /* bespoke trigger() - handles both FE and BEs */
2222
2223                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2224                                 fe->dai_link->name, cmd);
2225
2226                 ret = soc_pcm_bespoke_trigger(substream, cmd);
2227                 break;
2228         default:
2229                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2230                                 fe->dai_link->name);
2231                 ret = -EINVAL;
2232                 goto out;
2233         }
2234
2235         if (ret < 0) {
2236                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2237                         cmd, ret);
2238                 goto out;
2239         }
2240
2241         switch (cmd) {
2242         case SNDRV_PCM_TRIGGER_START:
2243         case SNDRV_PCM_TRIGGER_RESUME:
2244         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2245                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2246                 break;
2247         case SNDRV_PCM_TRIGGER_STOP:
2248         case SNDRV_PCM_TRIGGER_SUSPEND:
2249                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2250                 break;
2251         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2252                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2253                 break;
2254         }
2255
2256 out:
2257         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2258         return ret;
2259 }
2260
2261 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2262 {
2263         struct snd_soc_pcm_runtime *fe = substream->private_data;
2264         int stream = substream->stream;
2265
2266         /* if FE's runtime_update is already set, we're in race;
2267          * process this trigger later at exit
2268          */
2269         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2270                 fe->dpcm[stream].trigger_pending = cmd + 1;
2271                 return 0; /* delayed, assuming it's successful */
2272         }
2273
2274         /* we're alone, let's trigger */
2275         return dpcm_fe_dai_do_trigger(substream, cmd);
2276 }
2277
2278 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2279 {
2280         struct snd_soc_dpcm *dpcm;
2281         int ret = 0;
2282
2283         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2284
2285                 struct snd_soc_pcm_runtime *be = dpcm->be;
2286                 struct snd_pcm_substream *be_substream =
2287                         snd_soc_dpcm_get_substream(be, stream);
2288
2289                 /* is this op for this BE ? */
2290                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2291                         continue;
2292
2293                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2294                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2295                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2296                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2297                         continue;
2298
2299                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2300                         be->dai_link->name);
2301
2302                 ret = soc_pcm_prepare(be_substream);
2303                 if (ret < 0) {
2304                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2305                                 ret);
2306                         break;
2307                 }
2308
2309                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2310         }
2311         return ret;
2312 }
2313
2314 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2315 {
2316         struct snd_soc_pcm_runtime *fe = substream->private_data;
2317         int stream = substream->stream, ret = 0;
2318
2319         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2320
2321         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2322
2323         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2324
2325         /* there is no point preparing this FE if there are no BEs */
2326         if (list_empty(&fe->dpcm[stream].be_clients)) {
2327                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2328                                 fe->dai_link->name);
2329                 ret = -EINVAL;
2330                 goto out;
2331         }
2332
2333         ret = dpcm_be_dai_prepare(fe, substream->stream);
2334         if (ret < 0)
2335                 goto out;
2336
2337         /* call prepare on the frontend */
2338         ret = soc_pcm_prepare(substream);
2339         if (ret < 0) {
2340                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2341                         fe->dai_link->name);
2342                 goto out;
2343         }
2344
2345         /* run the stream event for each BE */
2346         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2347         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2348
2349 out:
2350         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2351         mutex_unlock(&fe->card->mutex);
2352
2353         return ret;
2354 }
2355
2356 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2357                      unsigned int cmd, void *arg)
2358 {
2359         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2360         struct snd_soc_platform *platform = rtd->platform;
2361
2362         if (platform->driver->ops && platform->driver->ops->ioctl)
2363                 return platform->driver->ops->ioctl(substream, cmd, arg);
2364         return snd_pcm_lib_ioctl(substream, cmd, arg);
2365 }
2366
2367 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2368 {
2369         struct snd_pcm_substream *substream =
2370                 snd_soc_dpcm_get_substream(fe, stream);
2371         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2372         int err;
2373
2374         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2375                         stream ? "capture" : "playback", fe->dai_link->name);
2376
2377         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2378                 /* call bespoke trigger - FE takes care of all BE triggers */
2379                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2380                                 fe->dai_link->name);
2381
2382                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2383                 if (err < 0)
2384                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2385         } else {
2386                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2387                         fe->dai_link->name);
2388
2389                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2390                 if (err < 0)
2391                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2392         }
2393
2394         err = dpcm_be_dai_hw_free(fe, stream);
2395         if (err < 0)
2396                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2397
2398         err = dpcm_be_dai_shutdown(fe, stream);
2399         if (err < 0)
2400                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2401
2402         /* run the stream event for each BE */
2403         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2404
2405         return 0;
2406 }
2407
2408 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2409 {
2410         struct snd_pcm_substream *substream =
2411                 snd_soc_dpcm_get_substream(fe, stream);
2412         struct snd_soc_dpcm *dpcm;
2413         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2414         int ret;
2415
2416         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2417                         stream ? "capture" : "playback", fe->dai_link->name);
2418
2419         /* Only start the BE if the FE is ready */
2420         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2421                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2422                 return -EINVAL;
2423
2424         /* startup must always be called for new BEs */
2425         ret = dpcm_be_dai_startup(fe, stream);
2426         if (ret < 0)
2427                 goto disconnect;
2428
2429         /* keep going if FE state is > open */
2430         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2431                 return 0;
2432
2433         ret = dpcm_be_dai_hw_params(fe, stream);
2434         if (ret < 0)
2435                 goto close;
2436
2437         /* keep going if FE state is > hw_params */
2438         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2439                 return 0;
2440
2441
2442         ret = dpcm_be_dai_prepare(fe, stream);
2443         if (ret < 0)
2444                 goto hw_free;
2445
2446         /* run the stream event for each BE */
2447         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2448
2449         /* keep going if FE state is > prepare */
2450         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2451                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2452                 return 0;
2453
2454         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2455                 /* call trigger on the frontend - FE takes care of all BE triggers */
2456                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2457                                 fe->dai_link->name);
2458
2459                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2460                 if (ret < 0) {
2461                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2462                         goto hw_free;
2463                 }
2464         } else {
2465                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2466                         fe->dai_link->name);
2467
2468                 ret = dpcm_be_dai_trigger(fe, stream,
2469                                         SNDRV_PCM_TRIGGER_START);
2470                 if (ret < 0) {
2471                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2472                         goto hw_free;
2473                 }
2474         }
2475
2476         return 0;
2477
2478 hw_free:
2479         dpcm_be_dai_hw_free(fe, stream);
2480 close:
2481         dpcm_be_dai_shutdown(fe, stream);
2482 disconnect:
2483         /* disconnect any non started BEs */
2484         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2485                 struct snd_soc_pcm_runtime *be = dpcm->be;
2486                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2487                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2488         }
2489
2490         return ret;
2491 }
2492
2493 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2494 {
2495         int ret;
2496
2497         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2498         ret = dpcm_run_update_startup(fe, stream);
2499         if (ret < 0)
2500                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2501         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2502
2503         return ret;
2504 }
2505
2506 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2507 {
2508         int ret;
2509
2510         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2511         ret = dpcm_run_update_shutdown(fe, stream);
2512         if (ret < 0)
2513                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2514         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2515
2516         return ret;
2517 }
2518
2519 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2520  * any DAI links.
2521  */
2522 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2523 {
2524         struct snd_soc_pcm_runtime *fe;
2525         int old, new, paths;
2526
2527         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2528         list_for_each_entry(fe, &card->rtd_list, list) {
2529                 struct snd_soc_dapm_widget_list *list;
2530
2531                 /* make sure link is FE */
2532                 if (!fe->dai_link->dynamic)
2533                         continue;
2534
2535                 /* only check active links */
2536                 if (!fe->cpu_dai->active)
2537                         continue;
2538
2539                 /* DAPM sync will call this to update DSP paths */
2540                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2541                         fe->dai_link->name);
2542
2543                 /* skip if FE doesn't have playback capability */
2544                 if (!fe->cpu_dai->driver->playback.channels_min
2545                     || !fe->codec_dai->driver->playback.channels_min)
2546                         goto capture;
2547
2548                 /* skip if FE isn't currently playing */
2549                 if (!fe->cpu_dai->playback_active
2550                     || !fe->codec_dai->playback_active)
2551                         goto capture;
2552
2553                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2554                 if (paths < 0) {
2555                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2556                                         fe->dai_link->name,  "playback");
2557                         mutex_unlock(&card->mutex);
2558                         return paths;
2559                 }
2560
2561                 /* update any new playback paths */
2562                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2563                 if (new) {
2564                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2565                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2566                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2567                 }
2568
2569                 /* update any old playback paths */
2570                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2571                 if (old) {
2572                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2573                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2574                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2575                 }
2576
2577                 dpcm_path_put(&list);
2578 capture:
2579                 /* skip if FE doesn't have capture capability */
2580                 if (!fe->cpu_dai->driver->capture.channels_min
2581                     || !fe->codec_dai->driver->capture.channels_min)
2582                         continue;
2583
2584                 /* skip if FE isn't currently capturing */
2585                 if (!fe->cpu_dai->capture_active
2586                     || !fe->codec_dai->capture_active)
2587                         continue;
2588
2589                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2590                 if (paths < 0) {
2591                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2592                                         fe->dai_link->name,  "capture");
2593                         mutex_unlock(&card->mutex);
2594                         return paths;
2595                 }
2596
2597                 /* update any new capture paths */
2598                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2599                 if (new) {
2600                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2601                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2602                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2603                 }
2604
2605                 /* update any old capture paths */
2606                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2607                 if (old) {
2608                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2609                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2610                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2611                 }
2612
2613                 dpcm_path_put(&list);
2614         }
2615
2616         mutex_unlock(&card->mutex);
2617         return 0;
2618 }
2619 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2620 {
2621         struct snd_soc_dpcm *dpcm;
2622         struct list_head *clients =
2623                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2624
2625         list_for_each_entry(dpcm, clients, list_be) {
2626
2627                 struct snd_soc_pcm_runtime *be = dpcm->be;
2628                 int i;
2629
2630                 if (be->dai_link->ignore_suspend)
2631                         continue;
2632
2633                 for (i = 0; i < be->num_codecs; i++) {
2634                         struct snd_soc_dai *dai = be->codec_dais[i];
2635                         struct snd_soc_dai_driver *drv = dai->driver;
2636
2637                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2638                                          be->dai_link->name);
2639
2640                         if (drv->ops && drv->ops->digital_mute &&
2641                                                         dai->playback_active)
2642                                 drv->ops->digital_mute(dai, mute);
2643                 }
2644         }
2645
2646         return 0;
2647 }
2648
2649 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2650 {
2651         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2652         struct snd_soc_dpcm *dpcm;
2653         struct snd_soc_dapm_widget_list *list;
2654         int ret;
2655         int stream = fe_substream->stream;
2656
2657         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2658         fe->dpcm[stream].runtime = fe_substream->runtime;
2659
2660         ret = dpcm_path_get(fe, stream, &list);
2661         if (ret < 0) {
2662                 mutex_unlock(&fe->card->mutex);
2663                 return ret;
2664         } else if (ret == 0) {
2665                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2666                         fe->dai_link->name, stream ? "capture" : "playback");
2667         }
2668
2669         /* calculate valid and active FE <-> BE dpcms */
2670         dpcm_process_paths(fe, stream, &list, 1);
2671
2672         ret = dpcm_fe_dai_startup(fe_substream);
2673         if (ret < 0) {
2674                 /* clean up all links */
2675                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2676                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2677
2678                 dpcm_be_disconnect(fe, stream);
2679                 fe->dpcm[stream].runtime = NULL;
2680         }
2681
2682         dpcm_clear_pending_state(fe, stream);
2683         dpcm_path_put(&list);
2684         mutex_unlock(&fe->card->mutex);
2685         return ret;
2686 }
2687
2688 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2689 {
2690         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2691         struct snd_soc_dpcm *dpcm;
2692         int stream = fe_substream->stream, ret;
2693
2694         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2695         ret = dpcm_fe_dai_shutdown(fe_substream);
2696
2697         /* mark FE's links ready to prune */
2698         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2699                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2700
2701         dpcm_be_disconnect(fe, stream);
2702
2703         fe->dpcm[stream].runtime = NULL;
2704         mutex_unlock(&fe->card->mutex);
2705         return ret;
2706 }
2707
2708 /* create a new pcm */
2709 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2710 {
2711         struct snd_soc_platform *platform = rtd->platform;
2712         struct snd_soc_dai *codec_dai;
2713         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2714         struct snd_pcm *pcm;
2715         char new_name[64];
2716         int ret = 0, playback = 0, capture = 0;
2717         int i;
2718
2719         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2720                 playback = rtd->dai_link->dpcm_playback;
2721                 capture = rtd->dai_link->dpcm_capture;
2722         } else {
2723                 for (i = 0; i < rtd->num_codecs; i++) {
2724                         codec_dai = rtd->codec_dais[i];
2725                         if (codec_dai->driver->playback.channels_min)
2726                                 playback = 1;
2727                         if (codec_dai->driver->capture.channels_min)
2728                                 capture = 1;
2729                 }
2730
2731                 capture = capture && cpu_dai->driver->capture.channels_min;
2732                 playback = playback && cpu_dai->driver->playback.channels_min;
2733         }
2734
2735         if (rtd->dai_link->playback_only) {
2736                 playback = 1;
2737                 capture = 0;
2738         }
2739
2740         if (rtd->dai_link->capture_only) {
2741                 playback = 0;
2742                 capture = 1;
2743         }
2744
2745         /* create the PCM */
2746         if (rtd->dai_link->no_pcm) {
2747                 snprintf(new_name, sizeof(new_name), "(%s)",
2748                         rtd->dai_link->stream_name);
2749
2750                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2751                                 playback, capture, &pcm);
2752         } else {
2753                 if (rtd->dai_link->dynamic)
2754                         snprintf(new_name, sizeof(new_name), "%s (*)",
2755                                 rtd->dai_link->stream_name);
2756                 else
2757                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2758                                 rtd->dai_link->stream_name,
2759                                 (rtd->num_codecs > 1) ?
2760                                 "multicodec" : rtd->codec_dai->name, num);
2761
2762                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2763                         capture, &pcm);
2764         }
2765         if (ret < 0) {
2766                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2767                         rtd->dai_link->name);
2768                 return ret;
2769         }
2770         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2771
2772         /* DAPM dai link stream work */
2773         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2774
2775         pcm->nonatomic = rtd->dai_link->nonatomic;
2776         rtd->pcm = pcm;
2777         pcm->private_data = rtd;
2778
2779         if (rtd->dai_link->no_pcm) {
2780                 if (playback)
2781                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2782                 if (capture)
2783                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2784                 goto out;
2785         }
2786
2787         /* ASoC PCM operations */
2788         if (rtd->dai_link->dynamic) {
2789                 rtd->ops.open           = dpcm_fe_dai_open;
2790                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2791                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2792                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2793                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2794                 rtd->ops.close          = dpcm_fe_dai_close;
2795                 rtd->ops.pointer        = soc_pcm_pointer;
2796                 rtd->ops.ioctl          = soc_pcm_ioctl;
2797         } else {
2798                 rtd->ops.open           = soc_pcm_open;
2799                 rtd->ops.hw_params      = soc_pcm_hw_params;
2800                 rtd->ops.prepare        = soc_pcm_prepare;
2801                 rtd->ops.trigger        = soc_pcm_trigger;
2802                 rtd->ops.hw_free        = soc_pcm_hw_free;
2803                 rtd->ops.close          = soc_pcm_close;
2804                 rtd->ops.pointer        = soc_pcm_pointer;
2805                 rtd->ops.ioctl          = soc_pcm_ioctl;
2806         }
2807
2808         if (platform->driver->ops) {
2809                 rtd->ops.ack            = platform->driver->ops->ack;
2810                 rtd->ops.copy           = platform->driver->ops->copy;
2811                 rtd->ops.silence        = platform->driver->ops->silence;
2812                 rtd->ops.page           = platform->driver->ops->page;
2813                 rtd->ops.mmap           = platform->driver->ops->mmap;
2814         }
2815
2816         if (playback)
2817                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2818
2819         if (capture)
2820                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2821
2822         if (platform->driver->pcm_new) {
2823                 ret = platform->driver->pcm_new(rtd);
2824                 if (ret < 0) {
2825                         dev_err(platform->dev,
2826                                 "ASoC: pcm constructor failed: %d\n",
2827                                 ret);
2828                         return ret;
2829                 }
2830         }
2831
2832         pcm->private_free = platform->driver->pcm_free;
2833 out:
2834         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2835                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2836                  cpu_dai->name);
2837         return ret;
2838 }
2839
2840 /* is the current PCM operation for this FE ? */
2841 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2842 {
2843         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2844                 return 1;
2845         return 0;
2846 }
2847 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2848
2849 /* is the current PCM operation for this BE ? */
2850 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2851                 struct snd_soc_pcm_runtime *be, int stream)
2852 {
2853         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2854            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2855                   be->dpcm[stream].runtime_update))
2856                 return 1;
2857         return 0;
2858 }
2859 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2860
2861 /* get the substream for this BE */
2862 struct snd_pcm_substream *
2863         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2864 {
2865         return be->pcm->streams[stream].substream;
2866 }
2867 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2868
2869 /* get the BE runtime state */
2870 enum snd_soc_dpcm_state
2871         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2872 {
2873         return be->dpcm[stream].state;
2874 }
2875 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2876
2877 /* set the BE runtime state */
2878 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2879                 int stream, enum snd_soc_dpcm_state state)
2880 {
2881         be->dpcm[stream].state = state;
2882 }
2883 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2884
2885 /*
2886  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2887  * are not running, paused or suspended for the specified stream direction.
2888  */
2889 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2890                 struct snd_soc_pcm_runtime *be, int stream)
2891 {
2892         struct snd_soc_dpcm *dpcm;
2893         int state;
2894
2895         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2896
2897                 if (dpcm->fe == fe)
2898                         continue;
2899
2900                 state = dpcm->fe->dpcm[stream].state;
2901                 if (state == SND_SOC_DPCM_STATE_START ||
2902                         state == SND_SOC_DPCM_STATE_PAUSED ||
2903                         state == SND_SOC_DPCM_STATE_SUSPEND)
2904                         return 0;
2905         }
2906
2907         /* it's safe to free/stop this BE DAI */
2908         return 1;
2909 }
2910 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2911
2912 /*
2913  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2914  * running, paused or suspended for the specified stream direction.
2915  */
2916 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2917                 struct snd_soc_pcm_runtime *be, int stream)
2918 {
2919         struct snd_soc_dpcm *dpcm;
2920         int state;
2921
2922         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2923
2924                 if (dpcm->fe == fe)
2925                         continue;
2926
2927                 state = dpcm->fe->dpcm[stream].state;
2928                 if (state == SND_SOC_DPCM_STATE_START ||
2929                         state == SND_SOC_DPCM_STATE_PAUSED ||
2930                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2931                         state == SND_SOC_DPCM_STATE_PREPARE)
2932                         return 0;
2933         }
2934
2935         /* it's safe to change hw_params */
2936         return 1;
2937 }
2938 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2939
2940 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2941                 int cmd, struct snd_soc_platform *platform)
2942 {
2943         if (platform->driver->ops && platform->driver->ops->trigger)
2944                 return platform->driver->ops->trigger(substream, cmd);
2945         return 0;
2946 }
2947 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2948
2949 #ifdef CONFIG_DEBUG_FS
2950 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2951 {
2952         switch (state) {
2953         case SND_SOC_DPCM_STATE_NEW:
2954                 return "new";
2955         case SND_SOC_DPCM_STATE_OPEN:
2956                 return "open";
2957         case SND_SOC_DPCM_STATE_HW_PARAMS:
2958                 return "hw_params";
2959         case SND_SOC_DPCM_STATE_PREPARE:
2960                 return "prepare";
2961         case SND_SOC_DPCM_STATE_START:
2962                 return "start";
2963         case SND_SOC_DPCM_STATE_STOP:
2964                 return "stop";
2965         case SND_SOC_DPCM_STATE_SUSPEND:
2966                 return "suspend";
2967         case SND_SOC_DPCM_STATE_PAUSED:
2968                 return "paused";
2969         case SND_SOC_DPCM_STATE_HW_FREE:
2970                 return "hw_free";
2971         case SND_SOC_DPCM_STATE_CLOSE:
2972                 return "close";
2973         }
2974
2975         return "unknown";
2976 }
2977
2978 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2979                                 int stream, char *buf, size_t size)
2980 {
2981         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2982         struct snd_soc_dpcm *dpcm;
2983         ssize_t offset = 0;
2984
2985         /* FE state */
2986         offset += scnprintf(buf + offset, size - offset,
2987                         "[%s - %s]\n", fe->dai_link->name,
2988                         stream ? "Capture" : "Playback");
2989
2990         offset += scnprintf(buf + offset, size - offset, "State: %s\n",
2991                         dpcm_state_string(fe->dpcm[stream].state));
2992
2993         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2994             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2995                 offset += scnprintf(buf + offset, size - offset,
2996                                 "Hardware Params: "
2997                                 "Format = %s, Channels = %d, Rate = %d\n",
2998                                 snd_pcm_format_name(params_format(params)),
2999                                 params_channels(params),
3000                                 params_rate(params));
3001
3002         /* BEs state */
3003         offset += scnprintf(buf + offset, size - offset, "Backends:\n");
3004
3005         if (list_empty(&fe->dpcm[stream].be_clients)) {
3006                 offset += scnprintf(buf + offset, size - offset,
3007                                 " No active DSP links\n");
3008                 goto out;
3009         }
3010
3011         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
3012                 struct snd_soc_pcm_runtime *be = dpcm->be;
3013                 params = &dpcm->hw_params;
3014
3015                 offset += scnprintf(buf + offset, size - offset,
3016                                 "- %s\n", be->dai_link->name);
3017
3018                 offset += scnprintf(buf + offset, size - offset,
3019                                 "   State: %s\n",
3020                                 dpcm_state_string(be->dpcm[stream].state));
3021
3022                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
3023                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
3024                         offset += scnprintf(buf + offset, size - offset,
3025                                 "   Hardware Params: "
3026                                 "Format = %s, Channels = %d, Rate = %d\n",
3027                                 snd_pcm_format_name(params_format(params)),
3028                                 params_channels(params),
3029                                 params_rate(params));
3030         }
3031
3032 out:
3033         return offset;
3034 }
3035
3036 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
3037                                 size_t count, loff_t *ppos)
3038 {
3039         struct snd_soc_pcm_runtime *fe = file->private_data;
3040         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
3041         char *buf;
3042
3043         buf = kmalloc(out_count, GFP_KERNEL);
3044         if (!buf)
3045                 return -ENOMEM;
3046
3047         if (fe->cpu_dai->driver->playback.channels_min)
3048                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
3049                                         buf + offset, out_count - offset);
3050
3051         if (fe->cpu_dai->driver->capture.channels_min)
3052                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
3053                                         buf + offset, out_count - offset);
3054
3055         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
3056
3057         kfree(buf);
3058         return ret;
3059 }
3060
3061 static const struct file_operations dpcm_state_fops = {
3062         .open = simple_open,
3063         .read = dpcm_state_read_file,
3064         .llseek = default_llseek,
3065 };
3066
3067 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
3068 {
3069         if (!rtd->dai_link)
3070                 return;
3071
3072         if (!rtd->card->debugfs_card_root)
3073                 return;
3074
3075         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
3076                         rtd->card->debugfs_card_root);
3077         if (!rtd->debugfs_dpcm_root) {
3078                 dev_dbg(rtd->dev,
3079                          "ASoC: Failed to create dpcm debugfs directory %s\n",
3080                          rtd->dai_link->name);
3081                 return;
3082         }
3083
3084         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
3085                                                 rtd->debugfs_dpcm_root,
3086                                                 rtd, &dpcm_state_fops);
3087 }
3088 #endif