sound/soc/soc-pcm.c

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