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