sound/soc/soc-pcm.c

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