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