sound/soc/soc-pcm.c

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