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: DAI prepare error: %d\n", ret);
 734                                 goto out;
 735                         }
 736                 }
 737         }
 738
 739         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 740                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 741                 if (ret < 0) {
 742                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
 743                                 ret);
 744                         goto out;
 745                 }
 746         }
 747
 748         /* cancel any delayed stream shutdown that is pending */
 749         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 750             rtd->pop_wait) {
 751                 rtd->pop_wait = 0;
 752                 cancel_delayed_work(&rtd->delayed_work);
 753         }
 754
 755         snd_soc_dapm_stream_event(rtd, substream->stream,
 756                         SND_SOC_DAPM_STREAM_START);
 757
 758         for (i = 0; i < rtd->num_codecs; i++)
 759                 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
 760                                          substream->stream);
 761         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
 762
 763 out:
 764         mutex_unlock(&rtd->pcm_mutex);
 765         return ret;
 766 }
 767
 768 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 769                                        unsigned int mask)
 770 {
 771         struct snd_interval *interval;
 772         int channels = hweight_long(mask);
 773
 774         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 775         interval->min = channels;
 776         interval->max = channels;
 777 }
 778
 779 int soc_dai_hw_params(struct snd_pcm_substream *substream,
 780                       struct snd_pcm_hw_params *params,
 781                       struct snd_soc_dai *dai)
 782 {
 783         int ret;
 784
 785         if (dai->driver->ops && dai->driver->ops->hw_params) {
 786                 ret = dai->driver->ops->hw_params(substream, params, dai);
 787                 if (ret < 0) {
 788                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
 789                                 dai->name, ret);
 790                         return ret;
 791                 }
 792         }
 793
 794         return 0;
 795 }
 796
 797 /*
 798  * Called by ALSA when the hardware params are set by application. This
 799  * function can also be called multiple times and can allocate buffers
 800  * (using snd_pcm_lib_* ). It's non-atomic.
 801  */
 802 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 803                                 struct snd_pcm_hw_params *params)
 804 {
 805         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 806         struct snd_soc_platform *platform = rtd->platform;
 807         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 808         int i, ret = 0;
 809
 810         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 811
 812         ret = soc_pcm_params_symmetry(substream, params);
 813         if (ret)
 814                 goto out;
 815
 816         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 817                 ret = rtd->dai_link->ops->hw_params(substream, params);
 818                 if (ret < 0) {
 819                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 820                                 " failed: %d\n", ret);
 821                         goto out;
 822                 }
 823         }
 824
 825         for (i = 0; i < rtd->num_codecs; i++) {
 826                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 827                 struct snd_pcm_hw_params codec_params;
 828
 829                 /* copy params for each codec */
 830                 codec_params = *params;
 831
 832                 /* fixup params based on TDM slot masks */
 833                 if (codec_dai->tx_mask)
 834                         soc_pcm_codec_params_fixup(&codec_params,
 835                                                    codec_dai->tx_mask);
 836                 if (codec_dai->rx_mask)
 837                         soc_pcm_codec_params_fixup(&codec_params,
 838                                                    codec_dai->rx_mask);
 839
 840                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
 841                 if(ret < 0)
 842                         goto codec_err;
 843
 844                 codec_dai->rate = params_rate(&codec_params);
 845                 codec_dai->channels = params_channels(&codec_params);
 846                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 847                                                 params_format(&codec_params));
 848         }
 849
 850         ret = soc_dai_hw_params(substream, params, cpu_dai);
 851         if (ret < 0)
 852                 goto interface_err;
 853
 854         if (platform->driver->ops && platform->driver->ops->hw_params) {
 855                 ret = platform->driver->ops->hw_params(substream, params);
 856                 if (ret < 0) {
 857                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 858                                platform->component.name, ret);
 859                         goto platform_err;
 860                 }
 861         }
 862
 863         /* store the parameters for each DAIs */
 864         cpu_dai->rate = params_rate(params);
 865         cpu_dai->channels = params_channels(params);
 866         cpu_dai->sample_bits =
 867                 snd_pcm_format_physical_width(params_format(params));
 868
 869 out:
 870         mutex_unlock(&rtd->pcm_mutex);
 871         return ret;
 872
 873 platform_err:
 874         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 875                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 876
 877 interface_err:
 878         i = rtd->num_codecs;
 879
 880 codec_err:
 881         while (--i >= 0) {
 882                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 883                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 884                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 885                 codec_dai->rate = 0;
 886         }
 887
 888         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 889                 rtd->dai_link->ops->hw_free(substream);
 890
 891         mutex_unlock(&rtd->pcm_mutex);
 892         return ret;
 893 }
 894
 895 /*
 896  * Frees resources allocated by hw_params, can be called multiple times
 897  */
 898 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 899 {
 900         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 901         struct snd_soc_platform *platform = rtd->platform;
 902         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 903         struct snd_soc_dai *codec_dai;
 904         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 905         int i;
 906
 907         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 908
 909         /* clear the corresponding DAIs parameters when going to be inactive */
 910         if (cpu_dai->active == 1) {
 911                 cpu_dai->rate = 0;
 912                 cpu_dai->channels = 0;
 913                 cpu_dai->sample_bits = 0;
 914         }
 915
 916         for (i = 0; i < rtd->num_codecs; i++) {
 917                 codec_dai = rtd->codec_dais[i];
 918                 if (codec_dai->active == 1) {
 919                         codec_dai->rate = 0;
 920                         codec_dai->channels = 0;
 921                         codec_dai->sample_bits = 0;
 922                 }
 923         }
 924
 925         /* apply codec digital mute */
 926         for (i = 0; i < rtd->num_codecs; i++) {
 927                 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
 928                     (!playback && rtd->codec_dais[i]->capture_active == 1))
 929                         snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
 930                                                  substream->stream);
 931         }
 932
 933         /* free any machine hw params */
 934         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 935                 rtd->dai_link->ops->hw_free(substream);
 936
 937         /* free any DMA resources */
 938         if (platform->driver->ops && platform->driver->ops->hw_free)
 939                 platform->driver->ops->hw_free(substream);
 940
 941         /* now free hw params for the DAIs  */
 942         for (i = 0; i < rtd->num_codecs; i++) {
 943                 codec_dai = rtd->codec_dais[i];
 944                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 945                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 946         }
 947
 948         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 949                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 950
 951         mutex_unlock(&rtd->pcm_mutex);
 952         return 0;
 953 }
 954
 955 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 956 {
 957         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 958         struct snd_soc_platform *platform = rtd->platform;
 959         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 960         struct snd_soc_dai *codec_dai;
 961         int i, ret;
 962
 963         for (i = 0; i < rtd->num_codecs; i++) {
 964                 codec_dai = rtd->codec_dais[i];
 965                 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
 966                         ret = codec_dai->driver->ops->trigger(substream,
 967                                                               cmd, codec_dai);
 968                         if (ret < 0)
 969                                 return ret;
 970                 }
 971         }
 972
 973         if (platform->driver->ops && platform->driver->ops->trigger) {
 974                 ret = platform->driver->ops->trigger(substream, cmd);
 975                 if (ret < 0)
 976                         return ret;
 977         }
 978
 979         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
 980                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 981                 if (ret < 0)
 982                         return ret;
 983         }
 984
 985         if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
 986                 ret = rtd->dai_link->ops->trigger(substream, cmd);
 987                 if (ret < 0)
 988                         return ret;
 989         }
 990
 991         return 0;
 992 }
 993
 994 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
 995                                    int cmd)
 996 {
 997         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 998         struct snd_soc_platform *platform = rtd->platform;
 999         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1000         struct snd_soc_dai *codec_dai;
1001         int i, ret;
1002
1003         for (i = 0; i < rtd->num_codecs; i++) {
1004                 codec_dai = rtd->codec_dais[i];
1005                 if (codec_dai->driver->ops &&
1006                     codec_dai->driver->ops->bespoke_trigger) {
1007                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1008                                                                 cmd, codec_dai);
1009                         if (ret < 0)
1010                                 return ret;
1011                 }
1012         }
1013
1014         if (platform->driver->bespoke_trigger) {
1015                 ret = platform->driver->bespoke_trigger(substream, cmd);
1016                 if (ret < 0)
1017                         return ret;
1018         }
1019
1020         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1021                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1022                 if (ret < 0)
1023                         return ret;
1024         }
1025         return 0;
1026 }
1027 /*
1028  * soc level wrapper for pointer callback
1029  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1030  * the runtime->delay will be updated accordingly.
1031  */
1032 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1033 {
1034         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1035         struct snd_soc_platform *platform = rtd->platform;
1036         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1037         struct snd_soc_dai *codec_dai;
1038         struct snd_pcm_runtime *runtime = substream->runtime;
1039         snd_pcm_uframes_t offset = 0;
1040         snd_pcm_sframes_t delay = 0;
1041         snd_pcm_sframes_t codec_delay = 0;
1042         int i;
1043
1044         if (platform->driver->ops && platform->driver->ops->pointer)
1045                 offset = platform->driver->ops->pointer(substream);
1046
1047         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1048                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1049
1050         for (i = 0; i < rtd->num_codecs; i++) {
1051                 codec_dai = rtd->codec_dais[i];
1052                 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1053                         codec_delay = max(codec_delay,
1054                                         codec_dai->driver->ops->delay(substream,
1055                                                                     codec_dai));
1056         }
1057         delay += codec_delay;
1058
1059         /*
1060          * None of the existing platform drivers implement delay(), so
1061          * for now the codec_dai of first multicodec entry is used
1062          */
1063         if (platform->driver->delay)
1064                 delay += platform->driver->delay(substream, rtd->codec_dais[0]);
1065
1066         runtime->delay = delay;
1067
1068         return offset;
1069 }
1070
1071 /* connect a FE and BE */
1072 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1073                 struct snd_soc_pcm_runtime *be, int stream)
1074 {
1075         struct snd_soc_dpcm *dpcm;
1076
1077         /* only add new dpcms */
1078         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1079                 if (dpcm->be == be && dpcm->fe == fe)
1080                         return 0;
1081         }
1082
1083         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1084         if (!dpcm)
1085                 return -ENOMEM;
1086
1087         dpcm->be = be;
1088         dpcm->fe = fe;
1089         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1090         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1091         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1092         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1093
1094         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1095                         stream ? "capture" : "playback",  fe->dai_link->name,
1096                         stream ? "<-" : "->", be->dai_link->name);
1097
1098 #ifdef CONFIG_DEBUG_FS
1099         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1100                         fe->debugfs_dpcm_root, &dpcm->state);
1101 #endif
1102         return 1;
1103 }
1104
1105 /* reparent a BE onto another FE */
1106 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1107                         struct snd_soc_pcm_runtime *be, int stream)
1108 {
1109         struct snd_soc_dpcm *dpcm;
1110         struct snd_pcm_substream *fe_substream, *be_substream;
1111
1112         /* reparent if BE is connected to other FEs */
1113         if (!be->dpcm[stream].users)
1114                 return;
1115
1116         be_substream = snd_soc_dpcm_get_substream(be, stream);
1117
1118         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1119                 if (dpcm->fe == fe)
1120                         continue;
1121
1122                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1123                         stream ? "capture" : "playback",
1124                         dpcm->fe->dai_link->name,
1125                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1126
1127                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1128                 be_substream->runtime = fe_substream->runtime;
1129                 break;
1130         }
1131 }
1132
1133 /* disconnect a BE and FE */
1134 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1135 {
1136         struct snd_soc_dpcm *dpcm, *d;
1137
1138         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1139                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1140                                 stream ? "capture" : "playback",
1141                                 dpcm->be->dai_link->name);
1142
1143                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1144                         continue;
1145
1146                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1147                         stream ? "capture" : "playback", fe->dai_link->name,
1148                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1149
1150                 /* BEs still alive need new FE */
1151                 dpcm_be_reparent(fe, dpcm->be, stream);
1152
1153 #ifdef CONFIG_DEBUG_FS
1154                 debugfs_remove(dpcm->debugfs_state);
1155 #endif
1156                 list_del(&dpcm->list_be);
1157                 list_del(&dpcm->list_fe);
1158                 kfree(dpcm);
1159         }
1160 }
1161
1162 /* get BE for DAI widget and stream */
1163 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1164                 struct snd_soc_dapm_widget *widget, int stream)
1165 {
1166         struct snd_soc_pcm_runtime *be;
1167         int i, j;
1168
1169         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1170                 for (i = 0; i < card->num_links; i++) {
1171                         be = &card->rtd[i];
1172
1173                         if (!be->dai_link->no_pcm)
1174                                 continue;
1175
1176                         if (be->cpu_dai->playback_widget == widget)
1177                                 return be;
1178
1179                         for (j = 0; j < be->num_codecs; j++) {
1180                                 struct snd_soc_dai *dai = be->codec_dais[j];
1181                                 if (dai->playback_widget == widget)
1182                                         return be;
1183                         }
1184                 }
1185         } else {
1186
1187                 for (i = 0; i < card->num_links; i++) {
1188                         be = &card->rtd[i];
1189
1190                         if (!be->dai_link->no_pcm)
1191                                 continue;
1192
1193                         if (be->cpu_dai->capture_widget == widget)
1194                                 return be;
1195
1196                         for (j = 0; j < be->num_codecs; j++) {
1197                                 struct snd_soc_dai *dai = be->codec_dais[j];
1198                                 if (dai->capture_widget == widget)
1199                                         return be;
1200                         }
1201                 }
1202         }
1203
1204         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1205                 stream ? "capture" : "playback", widget->name);
1206         return NULL;
1207 }
1208
1209 static inline struct snd_soc_dapm_widget *
1210         dai_get_widget(struct snd_soc_dai *dai, int stream)
1211 {
1212         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1213                 return dai->playback_widget;
1214         else
1215                 return dai->capture_widget;
1216 }
1217
1218 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1219                 struct snd_soc_dapm_widget *widget)
1220 {
1221         int i;
1222
1223         for (i = 0; i < list->num_widgets; i++) {
1224                 if (widget == list->widgets[i])
1225                         return 1;
1226         }
1227
1228         return 0;
1229 }
1230
1231 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1232         int stream, struct snd_soc_dapm_widget_list **list_)
1233 {
1234         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1235         struct snd_soc_dapm_widget_list *list;
1236         int paths;
1237
1238         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
1239                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
1240         if (list == NULL)
1241                 return -ENOMEM;
1242
1243         /* get number of valid DAI paths and their widgets */
1244         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
1245
1246         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1247                         stream ? "capture" : "playback");
1248
1249         *list_ = list;
1250         return paths;
1251 }
1252
1253 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1254         struct snd_soc_dapm_widget_list **list_)
1255 {
1256         struct snd_soc_dpcm *dpcm;
1257         struct snd_soc_dapm_widget_list *list = *list_;
1258         struct snd_soc_dapm_widget *widget;
1259         int prune = 0;
1260
1261         /* Destroy any old FE <--> BE connections */
1262         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1263                 unsigned int i;
1264
1265                 /* is there a valid CPU DAI widget for this BE */
1266                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1267
1268                 /* prune the BE if it's no longer in our active list */
1269                 if (widget && widget_in_list(list, widget))
1270                         continue;
1271
1272                 /* is there a valid CODEC DAI widget for this BE */
1273                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1274                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1275                         widget = dai_get_widget(dai, stream);
1276
1277                         /* prune the BE if it's no longer in our active list */
1278                         if (widget && widget_in_list(list, widget))
1279                                 continue;
1280                 }
1281
1282                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1283                         stream ? "capture" : "playback",
1284                         dpcm->be->dai_link->name, fe->dai_link->name);
1285                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1286                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1287                 prune++;
1288         }
1289
1290         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1291         return prune;
1292 }
1293
1294 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1295         struct snd_soc_dapm_widget_list **list_)
1296 {
1297         struct snd_soc_card *card = fe->card;
1298         struct snd_soc_dapm_widget_list *list = *list_;
1299         struct snd_soc_pcm_runtime *be;
1300         int i, new = 0, err;
1301
1302         /* Create any new FE <--> BE connections */
1303         for (i = 0; i < list->num_widgets; i++) {
1304
1305                 switch (list->widgets[i]->id) {
1306                 case snd_soc_dapm_dai_in:
1307                 case snd_soc_dapm_dai_out:
1308                         break;
1309                 default:
1310                         continue;
1311                 }
1312
1313                 /* is there a valid BE rtd for this widget */
1314                 be = dpcm_get_be(card, list->widgets[i], stream);
1315                 if (!be) {
1316                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1317                                         list->widgets[i]->name);
1318                         continue;
1319                 }
1320
1321                 /* make sure BE is a real BE */
1322                 if (!be->dai_link->no_pcm)
1323                         continue;
1324
1325                 /* don't connect if FE is not running */
1326                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1327                         continue;
1328
1329                 /* newly connected FE and BE */
1330                 err = dpcm_be_connect(fe, be, stream);
1331                 if (err < 0) {
1332                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1333                                 list->widgets[i]->name);
1334                         break;
1335                 } else if (err == 0) /* already connected */
1336                         continue;
1337
1338                 /* new */
1339                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1340                 new++;
1341         }
1342
1343         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1344         return new;
1345 }
1346
1347 /*
1348  * Find the corresponding BE DAIs that source or sink audio to this
1349  * FE substream.
1350  */
1351 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1352         int stream, struct snd_soc_dapm_widget_list **list, int new)
1353 {
1354         if (new)
1355                 return dpcm_add_paths(fe, stream, list);
1356         else
1357                 return dpcm_prune_paths(fe, stream, list);
1358 }
1359
1360 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1361 {
1362         struct snd_soc_dpcm *dpcm;
1363
1364         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1365                 dpcm->be->dpcm[stream].runtime_update =
1366                                                 SND_SOC_DPCM_UPDATE_NO;
1367 }
1368
1369 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1370         int stream)
1371 {
1372         struct snd_soc_dpcm *dpcm;
1373
1374         /* disable any enabled and non active backends */
1375         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1376
1377                 struct snd_soc_pcm_runtime *be = dpcm->be;
1378                 struct snd_pcm_substream *be_substream =
1379                         snd_soc_dpcm_get_substream(be, stream);
1380
1381                 if (be->dpcm[stream].users == 0)
1382                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1383                                 stream ? "capture" : "playback",
1384                                 be->dpcm[stream].state);
1385
1386                 if (--be->dpcm[stream].users != 0)
1387                         continue;
1388
1389                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1390                         continue;
1391
1392                 soc_pcm_close(be_substream);
1393                 be_substream->runtime = NULL;
1394                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1395         }
1396 }
1397
1398 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1399 {
1400         struct snd_soc_dpcm *dpcm;
1401         int err, count = 0;
1402
1403         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1404         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1405
1406                 struct snd_soc_pcm_runtime *be = dpcm->be;
1407                 struct snd_pcm_substream *be_substream =
1408                         snd_soc_dpcm_get_substream(be, stream);
1409
1410                 if (!be_substream) {
1411                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1412                                 stream ? "capture" : "playback");
1413                         continue;
1414                 }
1415
1416                 /* is this op for this BE ? */
1417                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1418                         continue;
1419
1420                 /* first time the dpcm is open ? */
1421                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1422                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1423                                 stream ? "capture" : "playback",
1424                                 be->dpcm[stream].state);
1425
1426                 if (be->dpcm[stream].users++ != 0)
1427                         continue;
1428
1429                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1430                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1431                         continue;
1432
1433                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1434                         stream ? "capture" : "playback", be->dai_link->name);
1435
1436                 be_substream->runtime = be->dpcm[stream].runtime;
1437                 err = soc_pcm_open(be_substream);
1438                 if (err < 0) {
1439                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1440                         be->dpcm[stream].users--;
1441                         if (be->dpcm[stream].users < 0)
1442                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1443                                         stream ? "capture" : "playback",
1444                                         be->dpcm[stream].state);
1445
1446                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1447                         goto unwind;
1448                 }
1449
1450                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1451                 count++;
1452         }
1453
1454         return count;
1455
1456 unwind:
1457         /* disable any enabled and non active backends */
1458         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1459                 struct snd_soc_pcm_runtime *be = dpcm->be;
1460                 struct snd_pcm_substream *be_substream =
1461                         snd_soc_dpcm_get_substream(be, stream);
1462
1463                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1464                         continue;
1465
1466                 if (be->dpcm[stream].users == 0)
1467                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1468                                 stream ? "capture" : "playback",
1469                                 be->dpcm[stream].state);
1470
1471                 if (--be->dpcm[stream].users != 0)
1472                         continue;
1473
1474                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1475                         continue;
1476
1477                 soc_pcm_close(be_substream);
1478                 be_substream->runtime = NULL;
1479                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1480         }
1481
1482         return err;
1483 }
1484
1485 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1486         struct snd_soc_pcm_stream *stream)
1487 {
1488         runtime->hw.rate_min = stream->rate_min;
1489         runtime->hw.rate_max = stream->rate_max;
1490         runtime->hw.channels_min = stream->channels_min;
1491         runtime->hw.channels_max = stream->channels_max;
1492         if (runtime->hw.formats)
1493                 runtime->hw.formats &= stream->formats;
1494         else
1495                 runtime->hw.formats = stream->formats;
1496         runtime->hw.rates = stream->rates;
1497 }
1498
1499 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1500 {
1501         struct snd_pcm_runtime *runtime = substream->runtime;
1502         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1503         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1504         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1505
1506         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1507                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback);
1508         else
1509                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture);
1510 }
1511
1512 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1513
1514 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1515  * for avoiding the race with trigger callback.
1516  * If the state is unset and a trigger is pending while the previous operation,
1517  * process the pending trigger action here.
1518  */
1519 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1520                                      int stream, enum snd_soc_dpcm_update state)
1521 {
1522         struct snd_pcm_substream *substream =
1523                 snd_soc_dpcm_get_substream(fe, stream);
1524
1525         snd_pcm_stream_lock_irq(substream);
1526         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1527                 dpcm_fe_dai_do_trigger(substream,
1528                                        fe->dpcm[stream].trigger_pending - 1);
1529                 fe->dpcm[stream].trigger_pending = 0;
1530         }
1531         fe->dpcm[stream].runtime_update = state;
1532         snd_pcm_stream_unlock_irq(substream);
1533 }
1534
1535 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1536 {
1537         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1538         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1539         int stream = fe_substream->stream, ret = 0;
1540
1541         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1542
1543         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1544         if (ret < 0) {
1545                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1546                 goto be_err;
1547         }
1548
1549         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1550
1551         /* start the DAI frontend */
1552         ret = soc_pcm_open(fe_substream);
1553         if (ret < 0) {
1554                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1555                 goto unwind;
1556         }
1557
1558         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1559
1560         dpcm_set_fe_runtime(fe_substream);
1561         snd_pcm_limit_hw_rates(runtime);
1562
1563         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1564         return 0;
1565
1566 unwind:
1567         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1568 be_err:
1569         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1570         return ret;
1571 }
1572
1573 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1574 {
1575         struct snd_soc_dpcm *dpcm;
1576
1577         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1578         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1579
1580                 struct snd_soc_pcm_runtime *be = dpcm->be;
1581                 struct snd_pcm_substream *be_substream =
1582                         snd_soc_dpcm_get_substream(be, stream);
1583
1584                 /* is this op for this BE ? */
1585                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1586                         continue;
1587
1588                 if (be->dpcm[stream].users == 0)
1589                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1590                                 stream ? "capture" : "playback",
1591                                 be->dpcm[stream].state);
1592
1593                 if (--be->dpcm[stream].users != 0)
1594                         continue;
1595
1596                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1597                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1598                         continue;
1599
1600                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1601                         dpcm->fe->dai_link->name);
1602
1603                 soc_pcm_close(be_substream);
1604                 be_substream->runtime = NULL;
1605
1606                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1607         }
1608         return 0;
1609 }
1610
1611 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1612 {
1613         struct snd_soc_pcm_runtime *fe = substream->private_data;
1614         int stream = substream->stream;
1615
1616         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1617
1618         /* shutdown the BEs */
1619         dpcm_be_dai_shutdown(fe, substream->stream);
1620
1621         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1622
1623         /* now shutdown the frontend */
1624         soc_pcm_close(substream);
1625
1626         /* run the stream event for each BE */
1627         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1628
1629         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1630         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1631         return 0;
1632 }
1633
1634 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1635 {
1636         struct snd_soc_dpcm *dpcm;
1637
1638         /* only hw_params backends that are either sinks or sources
1639          * to this frontend DAI */
1640         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1641
1642                 struct snd_soc_pcm_runtime *be = dpcm->be;
1643                 struct snd_pcm_substream *be_substream =
1644                         snd_soc_dpcm_get_substream(be, stream);
1645
1646                 /* is this op for this BE ? */
1647                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1648                         continue;
1649
1650                 /* only free hw when no longer used - check all FEs */
1651                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1652                                 continue;
1653
1654                 /* do not free hw if this BE is used by other FE */
1655                 if (be->dpcm[stream].users > 1)
1656                         continue;
1657
1658                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1659                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1660                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1661                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1662                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1663                         continue;
1664
1665                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1666                         dpcm->fe->dai_link->name);
1667
1668                 soc_pcm_hw_free(be_substream);
1669
1670                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1671         }
1672
1673         return 0;
1674 }
1675
1676 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1677 {
1678         struct snd_soc_pcm_runtime *fe = substream->private_data;
1679         int err, stream = substream->stream;
1680
1681         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1682         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1683
1684         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1685
1686         /* call hw_free on the frontend */
1687         err = soc_pcm_hw_free(substream);
1688         if (err < 0)
1689                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1690                         fe->dai_link->name);
1691
1692         /* only hw_params backends that are either sinks or sources
1693          * to this frontend DAI */
1694         err = dpcm_be_dai_hw_free(fe, stream);
1695
1696         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1697         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1698
1699         mutex_unlock(&fe->card->mutex);
1700         return 0;
1701 }
1702
1703 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1704 {
1705         struct snd_soc_dpcm *dpcm;
1706         int ret;
1707
1708         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1709
1710                 struct snd_soc_pcm_runtime *be = dpcm->be;
1711                 struct snd_pcm_substream *be_substream =
1712                         snd_soc_dpcm_get_substream(be, stream);
1713
1714                 /* is this op for this BE ? */
1715                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1716                         continue;
1717
1718                 /* only allow hw_params() if no connected FEs are running */
1719                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1720                         continue;
1721
1722                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1723                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1724                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1725                         continue;
1726
1727                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1728                         dpcm->fe->dai_link->name);
1729
1730                 /* copy params for each dpcm */
1731                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1732                                 sizeof(struct snd_pcm_hw_params));
1733
1734                 /* perform any hw_params fixups */
1735                 if (be->dai_link->be_hw_params_fixup) {
1736                         ret = be->dai_link->be_hw_params_fixup(be,
1737                                         &dpcm->hw_params);
1738                         if (ret < 0) {
1739                                 dev_err(be->dev,
1740                                         "ASoC: hw_params BE fixup failed %d\n",
1741                                         ret);
1742                                 goto unwind;
1743                         }
1744                 }
1745
1746                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1747                 if (ret < 0) {
1748                         dev_err(dpcm->be->dev,
1749                                 "ASoC: hw_params BE failed %d\n", ret);
1750                         goto unwind;
1751                 }
1752
1753                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1754         }
1755         return 0;
1756
1757 unwind:
1758         /* disable any enabled and non active backends */
1759         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1760                 struct snd_soc_pcm_runtime *be = dpcm->be;
1761                 struct snd_pcm_substream *be_substream =
1762                         snd_soc_dpcm_get_substream(be, stream);
1763
1764                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1765                         continue;
1766
1767                 /* only allow hw_free() if no connected FEs are running */
1768                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1769                         continue;
1770
1771                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1772                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1773                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1774                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1775                         continue;
1776
1777                 soc_pcm_hw_free(be_substream);
1778         }
1779
1780         return ret;
1781 }
1782
1783 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1784                                  struct snd_pcm_hw_params *params)
1785 {
1786         struct snd_soc_pcm_runtime *fe = substream->private_data;
1787         int ret, stream = substream->stream;
1788
1789         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1790         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1791
1792         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1793                         sizeof(struct snd_pcm_hw_params));
1794         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1795         if (ret < 0) {
1796                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1797                 goto out;
1798         }
1799
1800         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1801                         fe->dai_link->name, params_rate(params),
1802                         params_channels(params), params_format(params));
1803
1804         /* call hw_params on the frontend */
1805         ret = soc_pcm_hw_params(substream, params);
1806         if (ret < 0) {
1807                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1808                 dpcm_be_dai_hw_free(fe, stream);
1809          } else
1810                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1811
1812 out:
1813         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1814         mutex_unlock(&fe->card->mutex);
1815         return ret;
1816 }
1817
1818 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1819                 struct snd_pcm_substream *substream, int cmd)
1820 {
1821         int ret;
1822
1823         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1824                         dpcm->fe->dai_link->name, cmd);
1825
1826         ret = soc_pcm_trigger(substream, cmd);
1827         if (ret < 0)
1828                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1829
1830         return ret;
1831 }
1832
1833 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1834                                int cmd)
1835 {
1836         struct snd_soc_dpcm *dpcm;
1837         int ret = 0;
1838
1839         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1840
1841                 struct snd_soc_pcm_runtime *be = dpcm->be;
1842                 struct snd_pcm_substream *be_substream =
1843                         snd_soc_dpcm_get_substream(be, stream);
1844
1845                 /* is this op for this BE ? */
1846                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1847                         continue;
1848
1849                 switch (cmd) {
1850                 case SNDRV_PCM_TRIGGER_START:
1851                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1852                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1853                                 continue;
1854
1855                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1856                         if (ret)
1857                                 return ret;
1858
1859                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1860                         break;
1861                 case SNDRV_PCM_TRIGGER_RESUME:
1862                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1863                                 continue;
1864
1865                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1866                         if (ret)
1867                                 return ret;
1868
1869                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1870                         break;
1871                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1872                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1873                                 continue;
1874
1875                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1876                         if (ret)
1877                                 return ret;
1878
1879                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1880                         break;
1881                 case SNDRV_PCM_TRIGGER_STOP:
1882                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1883                                 continue;
1884
1885                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1886                                 continue;
1887
1888                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1889                         if (ret)
1890                                 return ret;
1891
1892                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1893                         break;
1894                 case SNDRV_PCM_TRIGGER_SUSPEND:
1895                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1896                                 continue;
1897
1898                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1899                                 continue;
1900
1901                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1902                         if (ret)
1903                                 return ret;
1904
1905                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1906                         break;
1907                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1908                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1909                                 continue;
1910
1911                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1912                                 continue;
1913
1914                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1915                         if (ret)
1916                                 return ret;
1917
1918                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1919                         break;
1920                 }
1921         }
1922
1923         return ret;
1924 }
1925 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1926
1927 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
1928 {
1929         struct snd_soc_pcm_runtime *fe = substream->private_data;
1930         int stream = substream->stream, ret;
1931         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1932
1933         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1934
1935         switch (trigger) {
1936         case SND_SOC_DPCM_TRIGGER_PRE:
1937                 /* call trigger on the frontend before the backend. */
1938
1939                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1940                                 fe->dai_link->name, cmd);
1941
1942                 ret = soc_pcm_trigger(substream, cmd);
1943                 if (ret < 0) {
1944                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1945                         goto out;
1946                 }
1947
1948                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1949                 break;
1950         case SND_SOC_DPCM_TRIGGER_POST:
1951                 /* call trigger on the frontend after the backend. */
1952
1953                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1954                 if (ret < 0) {
1955                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1956                         goto out;
1957                 }
1958
1959                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1960                                 fe->dai_link->name, cmd);
1961
1962                 ret = soc_pcm_trigger(substream, cmd);
1963                 break;
1964         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1965                 /* bespoke trigger() - handles both FE and BEs */
1966
1967                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1968                                 fe->dai_link->name, cmd);
1969
1970                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1971                 if (ret < 0) {
1972                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1973                         goto out;
1974                 }
1975                 break;
1976         default:
1977                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1978                                 fe->dai_link->name);
1979                 ret = -EINVAL;
1980                 goto out;
1981         }
1982
1983         switch (cmd) {
1984         case SNDRV_PCM_TRIGGER_START:
1985         case SNDRV_PCM_TRIGGER_RESUME:
1986         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1987                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1988                 break;
1989         case SNDRV_PCM_TRIGGER_STOP:
1990         case SNDRV_PCM_TRIGGER_SUSPEND:
1991         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1992                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1993                 break;
1994         }
1995
1996 out:
1997         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1998         return ret;
1999 }
2000
2001 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2002 {
2003         struct snd_soc_pcm_runtime *fe = substream->private_data;
2004         int stream = substream->stream;
2005
2006         /* if FE's runtime_update is already set, we're in race;
2007          * process this trigger later at exit
2008          */
2009         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2010                 fe->dpcm[stream].trigger_pending = cmd + 1;
2011                 return 0; /* delayed, assuming it's successful */
2012         }
2013
2014         /* we're alone, let's trigger */
2015         return dpcm_fe_dai_do_trigger(substream, cmd);
2016 }
2017
2018 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2019 {
2020         struct snd_soc_dpcm *dpcm;
2021         int ret = 0;
2022
2023         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2024
2025                 struct snd_soc_pcm_runtime *be = dpcm->be;
2026                 struct snd_pcm_substream *be_substream =
2027                         snd_soc_dpcm_get_substream(be, stream);
2028
2029                 /* is this op for this BE ? */
2030                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2031                         continue;
2032
2033                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2034                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2035                         continue;
2036
2037                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2038                         dpcm->fe->dai_link->name);
2039
2040                 ret = soc_pcm_prepare(be_substream);
2041                 if (ret < 0) {
2042                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2043                                 ret);
2044                         break;
2045                 }
2046
2047                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2048         }
2049         return ret;
2050 }
2051
2052 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2053 {
2054         struct snd_soc_pcm_runtime *fe = substream->private_data;
2055         int stream = substream->stream, ret = 0;
2056
2057         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2058
2059         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2060
2061         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2062
2063         /* there is no point preparing this FE if there are no BEs */
2064         if (list_empty(&fe->dpcm[stream].be_clients)) {
2065                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2066                                 fe->dai_link->name);
2067                 ret = -EINVAL;
2068                 goto out;
2069         }
2070
2071         ret = dpcm_be_dai_prepare(fe, substream->stream);
2072         if (ret < 0)
2073                 goto out;
2074
2075         /* call prepare on the frontend */
2076         ret = soc_pcm_prepare(substream);
2077         if (ret < 0) {
2078                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2079                         fe->dai_link->name);
2080                 goto out;
2081         }
2082
2083         /* run the stream event for each BE */
2084         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2085         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2086
2087 out:
2088         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2089         mutex_unlock(&fe->card->mutex);
2090
2091         return ret;
2092 }
2093
2094 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2095                      unsigned int cmd, void *arg)
2096 {
2097         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2098         struct snd_soc_platform *platform = rtd->platform;
2099
2100         if (platform->driver->ops && platform->driver->ops->ioctl)
2101                 return platform->driver->ops->ioctl(substream, cmd, arg);
2102         return snd_pcm_lib_ioctl(substream, cmd, arg);
2103 }
2104
2105 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2106 {
2107         struct snd_pcm_substream *substream =
2108                 snd_soc_dpcm_get_substream(fe, stream);
2109         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2110         int err;
2111
2112         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2113                         stream ? "capture" : "playback", fe->dai_link->name);
2114
2115         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2116                 /* call bespoke trigger - FE takes care of all BE triggers */
2117                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2118                                 fe->dai_link->name);
2119
2120                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2121                 if (err < 0)
2122                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2123         } else {
2124                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2125                         fe->dai_link->name);
2126
2127                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2128                 if (err < 0)
2129                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2130         }
2131
2132         err = dpcm_be_dai_hw_free(fe, stream);
2133         if (err < 0)
2134                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2135
2136         err = dpcm_be_dai_shutdown(fe, stream);
2137         if (err < 0)
2138                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2139
2140         /* run the stream event for each BE */
2141         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2142
2143         return 0;
2144 }
2145
2146 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2147 {
2148         struct snd_pcm_substream *substream =
2149                 snd_soc_dpcm_get_substream(fe, stream);
2150         struct snd_soc_dpcm *dpcm;
2151         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2152         int ret;
2153
2154         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2155                         stream ? "capture" : "playback", fe->dai_link->name);
2156
2157         /* Only start the BE if the FE is ready */
2158         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2159                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2160                 return -EINVAL;
2161
2162         /* startup must always be called for new BEs */
2163         ret = dpcm_be_dai_startup(fe, stream);
2164         if (ret < 0)
2165                 goto disconnect;
2166
2167         /* keep going if FE state is > open */
2168         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2169                 return 0;
2170
2171         ret = dpcm_be_dai_hw_params(fe, stream);
2172         if (ret < 0)
2173                 goto close;
2174
2175         /* keep going if FE state is > hw_params */
2176         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2177                 return 0;
2178
2179
2180         ret = dpcm_be_dai_prepare(fe, stream);
2181         if (ret < 0)
2182                 goto hw_free;
2183
2184         /* run the stream event for each BE */
2185         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2186
2187         /* keep going if FE state is > prepare */
2188         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2189                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2190                 return 0;
2191
2192         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2193                 /* call trigger on the frontend - FE takes care of all BE triggers */
2194                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2195                                 fe->dai_link->name);
2196
2197                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2198                 if (ret < 0) {
2199                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2200                         goto hw_free;
2201                 }
2202         } else {
2203                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2204                         fe->dai_link->name);
2205
2206                 ret = dpcm_be_dai_trigger(fe, stream,
2207                                         SNDRV_PCM_TRIGGER_START);
2208                 if (ret < 0) {
2209                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2210                         goto hw_free;
2211                 }
2212         }
2213
2214         return 0;
2215
2216 hw_free:
2217         dpcm_be_dai_hw_free(fe, stream);
2218 close:
2219         dpcm_be_dai_shutdown(fe, stream);
2220 disconnect:
2221         /* disconnect any non started BEs */
2222         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2223                 struct snd_soc_pcm_runtime *be = dpcm->be;
2224                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2225                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2226         }
2227
2228         return ret;
2229 }
2230
2231 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2232 {
2233         int ret;
2234
2235         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2236         ret = dpcm_run_update_startup(fe, stream);
2237         if (ret < 0)
2238                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2239         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2240
2241         return ret;
2242 }
2243
2244 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2245 {
2246         int ret;
2247
2248         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2249         ret = dpcm_run_update_shutdown(fe, stream);
2250         if (ret < 0)
2251                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2252         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2253
2254         return ret;
2255 }
2256
2257 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2258  * any DAI links.
2259  */
2260 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2261 {
2262         int i, old, new, paths;
2263
2264         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2265         for (i = 0; i < card->num_rtd; i++) {
2266                 struct snd_soc_dapm_widget_list *list;
2267                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
2268
2269                 /* make sure link is FE */
2270                 if (!fe->dai_link->dynamic)
2271                         continue;
2272
2273                 /* only check active links */
2274                 if (!fe->cpu_dai->active)
2275                         continue;
2276
2277                 /* DAPM sync will call this to update DSP paths */
2278                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2279                         fe->dai_link->name);
2280
2281                 /* skip if FE doesn't have playback capability */
2282                 if (!fe->cpu_dai->driver->playback.channels_min
2283                     || !fe->codec_dai->driver->playback.channels_min)
2284                         goto capture;
2285
2286                 /* skip if FE isn't currently playing */
2287                 if (!fe->cpu_dai->playback_active
2288                     || !fe->codec_dai->playback_active)
2289                         goto capture;
2290
2291                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2292                 if (paths < 0) {
2293                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2294                                         fe->dai_link->name,  "playback");
2295                         mutex_unlock(&card->mutex);
2296                         return paths;
2297                 }
2298
2299                 /* update any new playback paths */
2300                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2301                 if (new) {
2302                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2303                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2304                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2305                 }
2306
2307                 /* update any old playback paths */
2308                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2309                 if (old) {
2310                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2311                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2312                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2313                 }
2314
2315                 dpcm_path_put(&list);
2316 capture:
2317                 /* skip if FE doesn't have capture capability */
2318                 if (!fe->cpu_dai->driver->capture.channels_min
2319                     || !fe->codec_dai->driver->capture.channels_min)
2320                         continue;
2321
2322                 /* skip if FE isn't currently capturing */
2323                 if (!fe->cpu_dai->capture_active
2324                     || !fe->codec_dai->capture_active)
2325                         continue;
2326
2327                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2328                 if (paths < 0) {
2329                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2330                                         fe->dai_link->name,  "capture");
2331                         mutex_unlock(&card->mutex);
2332                         return paths;
2333                 }
2334
2335                 /* update any new capture paths */
2336                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2337                 if (new) {
2338                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2339                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2340                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2341                 }
2342
2343                 /* update any old capture paths */
2344                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2345                 if (old) {
2346                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2347                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2348                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2349                 }
2350
2351                 dpcm_path_put(&list);
2352         }
2353
2354         mutex_unlock(&card->mutex);
2355         return 0;
2356 }
2357 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2358 {
2359         struct snd_soc_dpcm *dpcm;
2360         struct list_head *clients =
2361                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2362
2363         list_for_each_entry(dpcm, clients, list_be) {
2364
2365                 struct snd_soc_pcm_runtime *be = dpcm->be;
2366                 int i;
2367
2368                 if (be->dai_link->ignore_suspend)
2369                         continue;
2370
2371                 for (i = 0; i < be->num_codecs; i++) {
2372                         struct snd_soc_dai *dai = be->codec_dais[i];
2373                         struct snd_soc_dai_driver *drv = dai->driver;
2374
2375                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2376                                          be->dai_link->name);
2377
2378                         if (drv->ops && drv->ops->digital_mute &&
2379                                                         dai->playback_active)
2380                                 drv->ops->digital_mute(dai, mute);
2381                 }
2382         }
2383
2384         return 0;
2385 }
2386
2387 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2388 {
2389         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2390         struct snd_soc_dpcm *dpcm;
2391         struct snd_soc_dapm_widget_list *list;
2392         int ret;
2393         int stream = fe_substream->stream;
2394
2395         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2396         fe->dpcm[stream].runtime = fe_substream->runtime;
2397
2398         ret = dpcm_path_get(fe, stream, &list);
2399         if (ret < 0) {
2400                 mutex_unlock(&fe->card->mutex);
2401                 return ret;
2402         } else if (ret == 0) {
2403                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2404                         fe->dai_link->name, stream ? "capture" : "playback");
2405         }
2406
2407         /* calculate valid and active FE <-> BE dpcms */
2408         dpcm_process_paths(fe, stream, &list, 1);
2409
2410         ret = dpcm_fe_dai_startup(fe_substream);
2411         if (ret < 0) {
2412                 /* clean up all links */
2413                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2414                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2415
2416                 dpcm_be_disconnect(fe, stream);
2417                 fe->dpcm[stream].runtime = NULL;
2418         }
2419
2420         dpcm_clear_pending_state(fe, stream);
2421         dpcm_path_put(&list);
2422         mutex_unlock(&fe->card->mutex);
2423         return ret;
2424 }
2425
2426 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2427 {
2428         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2429         struct snd_soc_dpcm *dpcm;
2430         int stream = fe_substream->stream, ret;
2431
2432         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2433         ret = dpcm_fe_dai_shutdown(fe_substream);
2434
2435         /* mark FE's links ready to prune */
2436         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2437                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2438
2439         dpcm_be_disconnect(fe, stream);
2440
2441         fe->dpcm[stream].runtime = NULL;
2442         mutex_unlock(&fe->card->mutex);
2443         return ret;
2444 }
2445
2446 /* create a new pcm */
2447 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2448 {
2449         struct snd_soc_platform *platform = rtd->platform;
2450         struct snd_soc_dai *codec_dai;
2451         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2452         struct snd_pcm *pcm;
2453         char new_name[64];
2454         int ret = 0, playback = 0, capture = 0;
2455         int i;
2456
2457         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2458                 playback = rtd->dai_link->dpcm_playback;
2459                 capture = rtd->dai_link->dpcm_capture;
2460         } else {
2461                 for (i = 0; i < rtd->num_codecs; i++) {
2462                         codec_dai = rtd->codec_dais[i];
2463                         if (codec_dai->driver->playback.channels_min)
2464                                 playback = 1;
2465                         if (codec_dai->driver->capture.channels_min)
2466                                 capture = 1;
2467                 }
2468
2469                 capture = capture && cpu_dai->driver->capture.channels_min;
2470                 playback = playback && cpu_dai->driver->playback.channels_min;
2471         }
2472
2473         if (rtd->dai_link->playback_only) {
2474                 playback = 1;
2475                 capture = 0;
2476         }
2477
2478         if (rtd->dai_link->capture_only) {
2479                 playback = 0;
2480                 capture = 1;
2481         }
2482
2483         /* create the PCM */
2484         if (rtd->dai_link->no_pcm) {
2485                 snprintf(new_name, sizeof(new_name), "(%s)",
2486                         rtd->dai_link->stream_name);
2487
2488                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2489                                 playback, capture, &pcm);
2490         } else {
2491                 if (rtd->dai_link->dynamic)
2492                         snprintf(new_name, sizeof(new_name), "%s (*)",
2493                                 rtd->dai_link->stream_name);
2494                 else
2495                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2496                                 rtd->dai_link->stream_name,
2497                                 (rtd->num_codecs > 1) ?
2498                                 "multicodec" : rtd->codec_dai->name, num);
2499
2500                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2501                         capture, &pcm);
2502         }
2503         if (ret < 0) {
2504                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2505                         rtd->dai_link->name);
2506                 return ret;
2507         }
2508         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2509
2510         /* DAPM dai link stream work */
2511         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2512
2513         rtd->pcm = pcm;
2514         pcm->private_data = rtd;
2515
2516         if (rtd->dai_link->no_pcm) {
2517                 if (playback)
2518                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2519                 if (capture)
2520                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2521                 goto out;
2522         }
2523
2524         /* ASoC PCM operations */
2525         if (rtd->dai_link->dynamic) {
2526                 rtd->ops.open           = dpcm_fe_dai_open;
2527                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2528                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2529                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2530                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2531                 rtd->ops.close          = dpcm_fe_dai_close;
2532                 rtd->ops.pointer        = soc_pcm_pointer;
2533                 rtd->ops.ioctl          = soc_pcm_ioctl;
2534         } else {
2535                 rtd->ops.open           = soc_pcm_open;
2536                 rtd->ops.hw_params      = soc_pcm_hw_params;
2537                 rtd->ops.prepare        = soc_pcm_prepare;
2538                 rtd->ops.trigger        = soc_pcm_trigger;
2539                 rtd->ops.hw_free        = soc_pcm_hw_free;
2540                 rtd->ops.close          = soc_pcm_close;
2541                 rtd->ops.pointer        = soc_pcm_pointer;
2542                 rtd->ops.ioctl          = soc_pcm_ioctl;
2543         }
2544
2545         if (platform->driver->ops) {
2546                 rtd->ops.ack            = platform->driver->ops->ack;
2547                 rtd->ops.copy           = platform->driver->ops->copy;
2548                 rtd->ops.silence        = platform->driver->ops->silence;
2549                 rtd->ops.page           = platform->driver->ops->page;
2550                 rtd->ops.mmap           = platform->driver->ops->mmap;
2551         }
2552
2553         if (playback)
2554                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2555
2556         if (capture)
2557                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2558
2559         if (platform->driver->pcm_new) {
2560                 ret = platform->driver->pcm_new(rtd);
2561                 if (ret < 0) {
2562                         dev_err(platform->dev,
2563                                 "ASoC: pcm constructor failed: %d\n",
2564                                 ret);
2565                         return ret;
2566                 }
2567         }
2568
2569         pcm->private_free = platform->driver->pcm_free;
2570 out:
2571         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2572                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2573                  cpu_dai->name);
2574         return ret;
2575 }
2576
2577 /* is the current PCM operation for this FE ? */
2578 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2579 {
2580         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2581                 return 1;
2582         return 0;
2583 }
2584 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2585
2586 /* is the current PCM operation for this BE ? */
2587 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2588                 struct snd_soc_pcm_runtime *be, int stream)
2589 {
2590         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2591            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2592                   be->dpcm[stream].runtime_update))
2593                 return 1;
2594         return 0;
2595 }
2596 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2597
2598 /* get the substream for this BE */
2599 struct snd_pcm_substream *
2600         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2601 {
2602         return be->pcm->streams[stream].substream;
2603 }
2604 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2605
2606 /* get the BE runtime state */
2607 enum snd_soc_dpcm_state
2608         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2609 {
2610         return be->dpcm[stream].state;
2611 }
2612 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2613
2614 /* set the BE runtime state */
2615 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2616                 int stream, enum snd_soc_dpcm_state state)
2617 {
2618         be->dpcm[stream].state = state;
2619 }
2620 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2621
2622 /*
2623  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2624  * are not running, paused or suspended for the specified stream direction.
2625  */
2626 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2627                 struct snd_soc_pcm_runtime *be, int stream)
2628 {
2629         struct snd_soc_dpcm *dpcm;
2630         int state;
2631
2632         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2633
2634                 if (dpcm->fe == fe)
2635                         continue;
2636
2637                 state = dpcm->fe->dpcm[stream].state;
2638                 if (state == SND_SOC_DPCM_STATE_START ||
2639                         state == SND_SOC_DPCM_STATE_PAUSED ||
2640                         state == SND_SOC_DPCM_STATE_SUSPEND)
2641                         return 0;
2642         }
2643
2644         /* it's safe to free/stop this BE DAI */
2645         return 1;
2646 }
2647 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2648
2649 /*
2650  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2651  * running, paused or suspended for the specified stream direction.
2652  */
2653 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2654                 struct snd_soc_pcm_runtime *be, int stream)
2655 {
2656         struct snd_soc_dpcm *dpcm;
2657         int state;
2658
2659         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2660
2661                 if (dpcm->fe == fe)
2662                         continue;
2663
2664                 state = dpcm->fe->dpcm[stream].state;
2665                 if (state == SND_SOC_DPCM_STATE_START ||
2666                         state == SND_SOC_DPCM_STATE_PAUSED ||
2667                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2668                         state == SND_SOC_DPCM_STATE_PREPARE)
2669                         return 0;
2670         }
2671
2672         /* it's safe to change hw_params */
2673         return 1;
2674 }
2675 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2676
2677 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2678                 int cmd, struct snd_soc_platform *platform)
2679 {
2680         if (platform->driver->ops && platform->driver->ops->trigger)
2681                 return platform->driver->ops->trigger(substream, cmd);
2682         return 0;
2683 }
2684 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2685
2686 #ifdef CONFIG_DEBUG_FS
2687 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2688 {
2689         switch (state) {
2690         case SND_SOC_DPCM_STATE_NEW:
2691                 return "new";
2692         case SND_SOC_DPCM_STATE_OPEN:
2693                 return "open";
2694         case SND_SOC_DPCM_STATE_HW_PARAMS:
2695                 return "hw_params";
2696         case SND_SOC_DPCM_STATE_PREPARE:
2697                 return "prepare";
2698         case SND_SOC_DPCM_STATE_START:
2699                 return "start";
2700         case SND_SOC_DPCM_STATE_STOP:
2701                 return "stop";
2702         case SND_SOC_DPCM_STATE_SUSPEND:
2703                 return "suspend";
2704         case SND_SOC_DPCM_STATE_PAUSED:
2705                 return "paused";
2706         case SND_SOC_DPCM_STATE_HW_FREE:
2707                 return "hw_free";
2708         case SND_SOC_DPCM_STATE_CLOSE:
2709                 return "close";
2710         }
2711
2712         return "unknown";
2713 }
2714
2715 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2716                                 int stream, char *buf, size_t size)
2717 {
2718         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2719         struct snd_soc_dpcm *dpcm;
2720         ssize_t offset = 0;
2721
2722         /* FE state */
2723         offset += snprintf(buf + offset, size - offset,
2724                         "[%s - %s]\n", fe->dai_link->name,
2725                         stream ? "Capture" : "Playback");
2726
2727         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2728                         dpcm_state_string(fe->dpcm[stream].state));
2729
2730         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2731             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2732                 offset += snprintf(buf + offset, size - offset,
2733                                 "Hardware Params: "
2734                                 "Format = %s, Channels = %d, Rate = %d\n",
2735                                 snd_pcm_format_name(params_format(params)),
2736                                 params_channels(params),
2737                                 params_rate(params));
2738
2739         /* BEs state */
2740         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2741
2742         if (list_empty(&fe->dpcm[stream].be_clients)) {
2743                 offset += snprintf(buf + offset, size - offset,
2744                                 " No active DSP links\n");
2745                 goto out;
2746         }
2747
2748         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2749                 struct snd_soc_pcm_runtime *be = dpcm->be;
2750                 params = &dpcm->hw_params;
2751
2752                 offset += snprintf(buf + offset, size - offset,
2753                                 "- %s\n", be->dai_link->name);
2754
2755                 offset += snprintf(buf + offset, size - offset,
2756                                 "   State: %s\n",
2757                                 dpcm_state_string(be->dpcm[stream].state));
2758
2759                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2760                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2761                         offset += snprintf(buf + offset, size - offset,
2762                                 "   Hardware Params: "
2763                                 "Format = %s, Channels = %d, Rate = %d\n",
2764                                 snd_pcm_format_name(params_format(params)),
2765                                 params_channels(params),
2766                                 params_rate(params));
2767         }
2768
2769 out:
2770         return offset;
2771 }
2772
2773 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2774                                 size_t count, loff_t *ppos)
2775 {
2776         struct snd_soc_pcm_runtime *fe = file->private_data;
2777         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2778         char *buf;
2779
2780         buf = kmalloc(out_count, GFP_KERNEL);
2781         if (!buf)
2782                 return -ENOMEM;
2783
2784         if (fe->cpu_dai->driver->playback.channels_min)
2785                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2786                                         buf + offset, out_count - offset);
2787
2788         if (fe->cpu_dai->driver->capture.channels_min)
2789                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2790                                         buf + offset, out_count - offset);
2791
2792         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2793
2794         kfree(buf);
2795         return ret;
2796 }
2797
2798 static const struct file_operations dpcm_state_fops = {
2799         .open = simple_open,
2800         .read = dpcm_state_read_file,
2801         .llseek = default_llseek,
2802 };
2803
2804 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2805 {
2806         if (!rtd->dai_link)
2807                 return 0;
2808
2809         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2810                         rtd->card->debugfs_card_root);
2811         if (!rtd->debugfs_dpcm_root) {
2812                 dev_dbg(rtd->dev,
2813                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2814                          rtd->dai_link->name);
2815                 return -EINVAL;
2816         }
2817
2818         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2819                                                 rtd->debugfs_dpcm_root,
2820                                                 rtd, &dpcm_state_fops);
2821
2822         return 0;
2823 }
2824 #endif