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                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1303                                 continue;
1304                         break;
1305                 case snd_soc_dapm_dai_out:
1306                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1307                                 continue;
1308                         break;
1309                 default:
1310                         continue;
1311                 }
1312
1313                 /* is there a valid BE rtd for this widget */
1314                 be = dpcm_get_be(card, list->widgets[i], stream);
1315                 if (!be) {
1316                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1317                                         list->widgets[i]->name);
1318                         continue;
1319                 }
1320
1321                 /* make sure BE is a real BE */
1322                 if (!be->dai_link->no_pcm)
1323                         continue;
1324
1325                 /* don't connect if FE is not running */
1326                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1327                         continue;
1328
1329                 /* newly connected FE and BE */
1330                 err = dpcm_be_connect(fe, be, stream);
1331                 if (err < 0) {
1332                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1333                                 list->widgets[i]->name);
1334                         break;
1335                 } else if (err == 0) /* already connected */
1336                         continue;
1337
1338                 /* new */
1339                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1340                 new++;
1341         }
1342
1343         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1344         return new;
1345 }
1346
1347 /*
1348  * Find the corresponding BE DAIs that source or sink audio to this
1349  * FE substream.
1350  */
1351 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1352         int stream, struct snd_soc_dapm_widget_list **list, int new)
1353 {
1354         if (new)
1355                 return dpcm_add_paths(fe, stream, list);
1356         else
1357                 return dpcm_prune_paths(fe, stream, list);
1358 }
1359
1360 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1361 {
1362         struct snd_soc_dpcm *dpcm;
1363
1364         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1365                 dpcm->be->dpcm[stream].runtime_update =
1366                                                 SND_SOC_DPCM_UPDATE_NO;
1367 }
1368
1369 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1370         int stream)
1371 {
1372         struct snd_soc_dpcm *dpcm;
1373
1374         /* disable any enabled and non active backends */
1375         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1376
1377                 struct snd_soc_pcm_runtime *be = dpcm->be;
1378                 struct snd_pcm_substream *be_substream =
1379                         snd_soc_dpcm_get_substream(be, stream);
1380
1381                 if (be->dpcm[stream].users == 0)
1382                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1383                                 stream ? "capture" : "playback",
1384                                 be->dpcm[stream].state);
1385
1386                 if (--be->dpcm[stream].users != 0)
1387                         continue;
1388
1389                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1390                         continue;
1391
1392                 soc_pcm_close(be_substream);
1393                 be_substream->runtime = NULL;
1394                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1395         }
1396 }
1397
1398 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1399 {
1400         struct snd_soc_dpcm *dpcm;
1401         int err, count = 0;
1402
1403         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1404         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1405
1406                 struct snd_soc_pcm_runtime *be = dpcm->be;
1407                 struct snd_pcm_substream *be_substream =
1408                         snd_soc_dpcm_get_substream(be, stream);
1409
1410                 if (!be_substream) {
1411                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1412                                 stream ? "capture" : "playback");
1413                         continue;
1414                 }
1415
1416                 /* is this op for this BE ? */
1417                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1418                         continue;
1419
1420                 /* first time the dpcm is open ? */
1421                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1422                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1423                                 stream ? "capture" : "playback",
1424                                 be->dpcm[stream].state);
1425
1426                 if (be->dpcm[stream].users++ != 0)
1427                         continue;
1428
1429                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1430                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1431                         continue;
1432
1433                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1434                         stream ? "capture" : "playback", be->dai_link->name);
1435
1436                 be_substream->runtime = be->dpcm[stream].runtime;
1437                 err = soc_pcm_open(be_substream);
1438                 if (err < 0) {
1439                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1440                         be->dpcm[stream].users--;
1441                         if (be->dpcm[stream].users < 0)
1442                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1443                                         stream ? "capture" : "playback",
1444                                         be->dpcm[stream].state);
1445
1446                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1447                         goto unwind;
1448                 }
1449
1450                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1451                 count++;
1452         }
1453
1454         return count;
1455
1456 unwind:
1457         /* disable any enabled and non active backends */
1458         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1459                 struct snd_soc_pcm_runtime *be = dpcm->be;
1460                 struct snd_pcm_substream *be_substream =
1461                         snd_soc_dpcm_get_substream(be, stream);
1462
1463                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1464                         continue;
1465
1466                 if (be->dpcm[stream].users == 0)
1467                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1468                                 stream ? "capture" : "playback",
1469                                 be->dpcm[stream].state);
1470
1471                 if (--be->dpcm[stream].users != 0)
1472                         continue;
1473
1474                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1475                         continue;
1476
1477                 soc_pcm_close(be_substream);
1478                 be_substream->runtime = NULL;
1479                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1480         }
1481
1482         return err;
1483 }
1484
1485 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1486                                  struct snd_soc_pcm_stream *stream,
1487                                  u64 formats)
1488 {
1489         runtime->hw.rate_min = stream->rate_min;
1490         runtime->hw.rate_max = stream->rate_max;
1491         runtime->hw.channels_min = stream->channels_min;
1492         runtime->hw.channels_max = stream->channels_max;
1493         if (runtime->hw.formats)
1494                 runtime->hw.formats &= formats & stream->formats;
1495         else
1496                 runtime->hw.formats = formats & stream->formats;
1497         runtime->hw.rates = stream->rates;
1498 }
1499
1500 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1501 {
1502         struct snd_soc_pcm_runtime *fe = substream->private_data;
1503         struct snd_soc_dpcm *dpcm;
1504         u64 formats = ULLONG_MAX;
1505         int stream = substream->stream;
1506
1507         if (!fe->dai_link->dpcm_merged_format)
1508                 return formats;
1509
1510         /*
1511          * It returns merged BE codec format
1512          * if FE want to use it (= dpcm_merged_format)
1513          */
1514
1515         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1516                 struct snd_soc_pcm_runtime *be = dpcm->be;
1517                 struct snd_soc_dai_driver *codec_dai_drv;
1518                 struct snd_soc_pcm_stream *codec_stream;
1519                 int i;
1520
1521                 for (i = 0; i < be->num_codecs; i++) {
1522                         codec_dai_drv = be->codec_dais[i]->driver;
1523                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1524                                 codec_stream = &codec_dai_drv->playback;
1525                         else
1526                                 codec_stream = &codec_dai_drv->capture;
1527
1528                         formats &= codec_stream->formats;
1529                 }
1530         }
1531
1532         return formats;
1533 }
1534
1535 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1536 {
1537         struct snd_pcm_runtime *runtime = substream->runtime;
1538         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1539         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1540         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1541         u64 format = dpcm_runtime_base_format(substream);
1542
1543         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1544                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1545         else
1546                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1547 }
1548
1549 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1550
1551 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1552  * for avoiding the race with trigger callback.
1553  * If the state is unset and a trigger is pending while the previous operation,
1554  * process the pending trigger action here.
1555  */
1556 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1557                                      int stream, enum snd_soc_dpcm_update state)
1558 {
1559         struct snd_pcm_substream *substream =
1560                 snd_soc_dpcm_get_substream(fe, stream);
1561
1562         snd_pcm_stream_lock_irq(substream);
1563         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1564                 dpcm_fe_dai_do_trigger(substream,
1565                                        fe->dpcm[stream].trigger_pending - 1);
1566                 fe->dpcm[stream].trigger_pending = 0;
1567         }
1568         fe->dpcm[stream].runtime_update = state;
1569         snd_pcm_stream_unlock_irq(substream);
1570 }
1571
1572 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1573 {
1574         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1575         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1576         int stream = fe_substream->stream, ret = 0;
1577
1578         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1579
1580         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1581         if (ret < 0) {
1582                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1583                 goto be_err;
1584         }
1585
1586         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1587
1588         /* start the DAI frontend */
1589         ret = soc_pcm_open(fe_substream);
1590         if (ret < 0) {
1591                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1592                 goto unwind;
1593         }
1594
1595         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1596
1597         dpcm_set_fe_runtime(fe_substream);
1598         snd_pcm_limit_hw_rates(runtime);
1599
1600         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1601         return 0;
1602
1603 unwind:
1604         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1605 be_err:
1606         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1607         return ret;
1608 }
1609
1610 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1611 {
1612         struct snd_soc_dpcm *dpcm;
1613
1614         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1615         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1616
1617                 struct snd_soc_pcm_runtime *be = dpcm->be;
1618                 struct snd_pcm_substream *be_substream =
1619                         snd_soc_dpcm_get_substream(be, stream);
1620
1621                 /* is this op for this BE ? */
1622                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1623                         continue;
1624
1625                 if (be->dpcm[stream].users == 0)
1626                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1627                                 stream ? "capture" : "playback",
1628                                 be->dpcm[stream].state);
1629
1630                 if (--be->dpcm[stream].users != 0)
1631                         continue;
1632
1633                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1634                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1635                         continue;
1636
1637                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1638                         dpcm->fe->dai_link->name);
1639
1640                 soc_pcm_close(be_substream);
1641                 be_substream->runtime = NULL;
1642
1643                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1644         }
1645         return 0;
1646 }
1647
1648 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1649 {
1650         struct snd_soc_pcm_runtime *fe = substream->private_data;
1651         int stream = substream->stream;
1652
1653         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1654
1655         /* shutdown the BEs */
1656         dpcm_be_dai_shutdown(fe, substream->stream);
1657
1658         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1659
1660         /* now shutdown the frontend */
1661         soc_pcm_close(substream);
1662
1663         /* run the stream event for each BE */
1664         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1665
1666         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1667         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1668         return 0;
1669 }
1670
1671 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1672 {
1673         struct snd_soc_dpcm *dpcm;
1674
1675         /* only hw_params backends that are either sinks or sources
1676          * to this frontend DAI */
1677         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1678
1679                 struct snd_soc_pcm_runtime *be = dpcm->be;
1680                 struct snd_pcm_substream *be_substream =
1681                         snd_soc_dpcm_get_substream(be, stream);
1682
1683                 /* is this op for this BE ? */
1684                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1685                         continue;
1686
1687                 /* only free hw when no longer used - check all FEs */
1688                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1689                                 continue;
1690
1691                 /* do not free hw if this BE is used by other FE */
1692                 if (be->dpcm[stream].users > 1)
1693                         continue;
1694
1695                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1696                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1697                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1698                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1699                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1700                         continue;
1701
1702                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1703                         dpcm->fe->dai_link->name);
1704
1705                 soc_pcm_hw_free(be_substream);
1706
1707                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1708         }
1709
1710         return 0;
1711 }
1712
1713 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1714 {
1715         struct snd_soc_pcm_runtime *fe = substream->private_data;
1716         int err, stream = substream->stream;
1717
1718         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1719         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1720
1721         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1722
1723         /* call hw_free on the frontend */
1724         err = soc_pcm_hw_free(substream);
1725         if (err < 0)
1726                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1727                         fe->dai_link->name);
1728
1729         /* only hw_params backends that are either sinks or sources
1730          * to this frontend DAI */
1731         err = dpcm_be_dai_hw_free(fe, stream);
1732
1733         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1734         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1735
1736         mutex_unlock(&fe->card->mutex);
1737         return 0;
1738 }
1739
1740 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1741 {
1742         struct snd_soc_dpcm *dpcm;
1743         int ret;
1744
1745         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1746
1747                 struct snd_soc_pcm_runtime *be = dpcm->be;
1748                 struct snd_pcm_substream *be_substream =
1749                         snd_soc_dpcm_get_substream(be, stream);
1750
1751                 /* is this op for this BE ? */
1752                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1753                         continue;
1754
1755                 /* only allow hw_params() if no connected FEs are running */
1756                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1757                         continue;
1758
1759                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1760                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1761                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1762                         continue;
1763
1764                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1765                         dpcm->fe->dai_link->name);
1766
1767                 /* copy params for each dpcm */
1768                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1769                                 sizeof(struct snd_pcm_hw_params));
1770
1771                 /* perform any hw_params fixups */
1772                 if (be->dai_link->be_hw_params_fixup) {
1773                         ret = be->dai_link->be_hw_params_fixup(be,
1774                                         &dpcm->hw_params);
1775                         if (ret < 0) {
1776                                 dev_err(be->dev,
1777                                         "ASoC: hw_params BE fixup failed %d\n",
1778                                         ret);
1779                                 goto unwind;
1780                         }
1781                 }
1782
1783                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1784                 if (ret < 0) {
1785                         dev_err(dpcm->be->dev,
1786                                 "ASoC: hw_params BE failed %d\n", ret);
1787                         goto unwind;
1788                 }
1789
1790                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1791         }
1792         return 0;
1793
1794 unwind:
1795         /* disable any enabled and non active backends */
1796         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1797                 struct snd_soc_pcm_runtime *be = dpcm->be;
1798                 struct snd_pcm_substream *be_substream =
1799                         snd_soc_dpcm_get_substream(be, stream);
1800
1801                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1802                         continue;
1803
1804                 /* only allow hw_free() if no connected FEs are running */
1805                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1806                         continue;
1807
1808                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1809                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1810                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1811                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1812                         continue;
1813
1814                 soc_pcm_hw_free(be_substream);
1815         }
1816
1817         return ret;
1818 }
1819
1820 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1821                                  struct snd_pcm_hw_params *params)
1822 {
1823         struct snd_soc_pcm_runtime *fe = substream->private_data;
1824         int ret, stream = substream->stream;
1825
1826         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1827         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1828
1829         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1830                         sizeof(struct snd_pcm_hw_params));
1831         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1832         if (ret < 0) {
1833                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1834                 goto out;
1835         }
1836
1837         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1838                         fe->dai_link->name, params_rate(params),
1839                         params_channels(params), params_format(params));
1840
1841         /* call hw_params on the frontend */
1842         ret = soc_pcm_hw_params(substream, params);
1843         if (ret < 0) {
1844                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1845                 dpcm_be_dai_hw_free(fe, stream);
1846          } else
1847                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1848
1849 out:
1850         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1851         mutex_unlock(&fe->card->mutex);
1852         return ret;
1853 }
1854
1855 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1856                 struct snd_pcm_substream *substream, int cmd)
1857 {
1858         int ret;
1859
1860         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1861                         dpcm->fe->dai_link->name, cmd);
1862
1863         ret = soc_pcm_trigger(substream, cmd);
1864         if (ret < 0)
1865                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1866
1867         return ret;
1868 }
1869
1870 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1871                                int cmd)
1872 {
1873         struct snd_soc_dpcm *dpcm;
1874         int ret = 0;
1875
1876         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1877
1878                 struct snd_soc_pcm_runtime *be = dpcm->be;
1879                 struct snd_pcm_substream *be_substream =
1880                         snd_soc_dpcm_get_substream(be, stream);
1881
1882                 /* is this op for this BE ? */
1883                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1884                         continue;
1885
1886                 switch (cmd) {
1887                 case SNDRV_PCM_TRIGGER_START:
1888                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1889                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1890                                 continue;
1891
1892                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1893                         if (ret)
1894                                 return ret;
1895
1896                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1897                         break;
1898                 case SNDRV_PCM_TRIGGER_RESUME:
1899                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1900                                 continue;
1901
1902                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1903                         if (ret)
1904                                 return ret;
1905
1906                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1907                         break;
1908                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1909                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1910                                 continue;
1911
1912                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1913                         if (ret)
1914                                 return ret;
1915
1916                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1917                         break;
1918                 case SNDRV_PCM_TRIGGER_STOP:
1919                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1920                                 continue;
1921
1922                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1923                                 continue;
1924
1925                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1926                         if (ret)
1927                                 return ret;
1928
1929                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1930                         break;
1931                 case SNDRV_PCM_TRIGGER_SUSPEND:
1932                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1933                                 continue;
1934
1935                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1936                                 continue;
1937
1938                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1939                         if (ret)
1940                                 return ret;
1941
1942                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1943                         break;
1944                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1945                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1946                                 continue;
1947
1948                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1949                                 continue;
1950
1951                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1952                         if (ret)
1953                                 return ret;
1954
1955                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1956                         break;
1957                 }
1958         }
1959
1960         return ret;
1961 }
1962 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1963
1964 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
1965 {
1966         struct snd_soc_pcm_runtime *fe = substream->private_data;
1967         int stream = substream->stream, ret;
1968         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1969
1970         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1971
1972         switch (trigger) {
1973         case SND_SOC_DPCM_TRIGGER_PRE:
1974                 /* call trigger on the frontend before the backend. */
1975
1976                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1977                                 fe->dai_link->name, cmd);
1978
1979                 ret = soc_pcm_trigger(substream, cmd);
1980                 if (ret < 0) {
1981                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1982                         goto out;
1983                 }
1984
1985                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1986                 break;
1987         case SND_SOC_DPCM_TRIGGER_POST:
1988                 /* call trigger on the frontend after the backend. */
1989
1990                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1991                 if (ret < 0) {
1992                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1993                         goto out;
1994                 }
1995
1996                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1997                                 fe->dai_link->name, cmd);
1998
1999                 ret = soc_pcm_trigger(substream, cmd);
2000                 break;
2001         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2002                 /* bespoke trigger() - handles both FE and BEs */
2003
2004                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2005                                 fe->dai_link->name, cmd);
2006
2007                 ret = soc_pcm_bespoke_trigger(substream, cmd);
2008                 if (ret < 0) {
2009                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2010                         goto out;
2011                 }
2012                 break;
2013         default:
2014                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2015                                 fe->dai_link->name);
2016                 ret = -EINVAL;
2017                 goto out;
2018         }
2019
2020         switch (cmd) {
2021         case SNDRV_PCM_TRIGGER_START:
2022         case SNDRV_PCM_TRIGGER_RESUME:
2023         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2024                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2025                 break;
2026         case SNDRV_PCM_TRIGGER_STOP:
2027         case SNDRV_PCM_TRIGGER_SUSPEND:
2028         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2029                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2030                 break;
2031         }
2032
2033 out:
2034         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2035         return ret;
2036 }
2037
2038 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2039 {
2040         struct snd_soc_pcm_runtime *fe = substream->private_data;
2041         int stream = substream->stream;
2042
2043         /* if FE's runtime_update is already set, we're in race;
2044          * process this trigger later at exit
2045          */
2046         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2047                 fe->dpcm[stream].trigger_pending = cmd + 1;
2048                 return 0; /* delayed, assuming it's successful */
2049         }
2050
2051         /* we're alone, let's trigger */
2052         return dpcm_fe_dai_do_trigger(substream, cmd);
2053 }
2054
2055 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2056 {
2057         struct snd_soc_dpcm *dpcm;
2058         int ret = 0;
2059
2060         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2061
2062                 struct snd_soc_pcm_runtime *be = dpcm->be;
2063                 struct snd_pcm_substream *be_substream =
2064                         snd_soc_dpcm_get_substream(be, stream);
2065
2066                 /* is this op for this BE ? */
2067                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2068                         continue;
2069
2070                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2071                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2072                         continue;
2073
2074                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2075                         dpcm->fe->dai_link->name);
2076
2077                 ret = soc_pcm_prepare(be_substream);
2078                 if (ret < 0) {
2079                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2080                                 ret);
2081                         break;
2082                 }
2083
2084                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2085         }
2086         return ret;
2087 }
2088
2089 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2090 {
2091         struct snd_soc_pcm_runtime *fe = substream->private_data;
2092         int stream = substream->stream, ret = 0;
2093
2094         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2095
2096         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2097
2098         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2099
2100         /* there is no point preparing this FE if there are no BEs */
2101         if (list_empty(&fe->dpcm[stream].be_clients)) {
2102                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2103                                 fe->dai_link->name);
2104                 ret = -EINVAL;
2105                 goto out;
2106         }
2107
2108         ret = dpcm_be_dai_prepare(fe, substream->stream);
2109         if (ret < 0)
2110                 goto out;
2111
2112         /* call prepare on the frontend */
2113         ret = soc_pcm_prepare(substream);
2114         if (ret < 0) {
2115                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2116                         fe->dai_link->name);
2117                 goto out;
2118         }
2119
2120         /* run the stream event for each BE */
2121         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2122         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2123
2124 out:
2125         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2126         mutex_unlock(&fe->card->mutex);
2127
2128         return ret;
2129 }
2130
2131 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2132                      unsigned int cmd, void *arg)
2133 {
2134         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2135         struct snd_soc_platform *platform = rtd->platform;
2136
2137         if (platform->driver->ops && platform->driver->ops->ioctl)
2138                 return platform->driver->ops->ioctl(substream, cmd, arg);
2139         return snd_pcm_lib_ioctl(substream, cmd, arg);
2140 }
2141
2142 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2143 {
2144         struct snd_pcm_substream *substream =
2145                 snd_soc_dpcm_get_substream(fe, stream);
2146         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2147         int err;
2148
2149         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2150                         stream ? "capture" : "playback", fe->dai_link->name);
2151
2152         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2153                 /* call bespoke trigger - FE takes care of all BE triggers */
2154                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2155                                 fe->dai_link->name);
2156
2157                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2158                 if (err < 0)
2159                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2160         } else {
2161                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2162                         fe->dai_link->name);
2163
2164                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2165                 if (err < 0)
2166                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2167         }
2168
2169         err = dpcm_be_dai_hw_free(fe, stream);
2170         if (err < 0)
2171                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2172
2173         err = dpcm_be_dai_shutdown(fe, stream);
2174         if (err < 0)
2175                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2176
2177         /* run the stream event for each BE */
2178         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2179
2180         return 0;
2181 }
2182
2183 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2184 {
2185         struct snd_pcm_substream *substream =
2186                 snd_soc_dpcm_get_substream(fe, stream);
2187         struct snd_soc_dpcm *dpcm;
2188         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2189         int ret;
2190
2191         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2192                         stream ? "capture" : "playback", fe->dai_link->name);
2193
2194         /* Only start the BE if the FE is ready */
2195         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2196                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2197                 return -EINVAL;
2198
2199         /* startup must always be called for new BEs */
2200         ret = dpcm_be_dai_startup(fe, stream);
2201         if (ret < 0)
2202                 goto disconnect;
2203
2204         /* keep going if FE state is > open */
2205         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2206                 return 0;
2207
2208         ret = dpcm_be_dai_hw_params(fe, stream);
2209         if (ret < 0)
2210                 goto close;
2211
2212         /* keep going if FE state is > hw_params */
2213         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2214                 return 0;
2215
2216
2217         ret = dpcm_be_dai_prepare(fe, stream);
2218         if (ret < 0)
2219                 goto hw_free;
2220
2221         /* run the stream event for each BE */
2222         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2223
2224         /* keep going if FE state is > prepare */
2225         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2226                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2227                 return 0;
2228
2229         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2230                 /* call trigger on the frontend - FE takes care of all BE triggers */
2231                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2232                                 fe->dai_link->name);
2233
2234                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2235                 if (ret < 0) {
2236                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2237                         goto hw_free;
2238                 }
2239         } else {
2240                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2241                         fe->dai_link->name);
2242
2243                 ret = dpcm_be_dai_trigger(fe, stream,
2244                                         SNDRV_PCM_TRIGGER_START);
2245                 if (ret < 0) {
2246                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2247                         goto hw_free;
2248                 }
2249         }
2250
2251         return 0;
2252
2253 hw_free:
2254         dpcm_be_dai_hw_free(fe, stream);
2255 close:
2256         dpcm_be_dai_shutdown(fe, stream);
2257 disconnect:
2258         /* disconnect any non started BEs */
2259         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2260                 struct snd_soc_pcm_runtime *be = dpcm->be;
2261                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2262                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2263         }
2264
2265         return ret;
2266 }
2267
2268 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2269 {
2270         int ret;
2271
2272         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2273         ret = dpcm_run_update_startup(fe, stream);
2274         if (ret < 0)
2275                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2276         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2277
2278         return ret;
2279 }
2280
2281 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2282 {
2283         int ret;
2284
2285         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2286         ret = dpcm_run_update_shutdown(fe, stream);
2287         if (ret < 0)
2288                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2289         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2290
2291         return ret;
2292 }
2293
2294 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2295  * any DAI links.
2296  */
2297 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2298 {
2299         int i, old, new, paths;
2300
2301         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2302         for (i = 0; i < card->num_rtd; i++) {
2303                 struct snd_soc_dapm_widget_list *list;
2304                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
2305
2306                 /* make sure link is FE */
2307                 if (!fe->dai_link->dynamic)
2308                         continue;
2309
2310                 /* only check active links */
2311                 if (!fe->cpu_dai->active)
2312                         continue;
2313
2314                 /* DAPM sync will call this to update DSP paths */
2315                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2316                         fe->dai_link->name);
2317
2318                 /* skip if FE doesn't have playback capability */
2319                 if (!fe->cpu_dai->driver->playback.channels_min
2320                     || !fe->codec_dai->driver->playback.channels_min)
2321                         goto capture;
2322
2323                 /* skip if FE isn't currently playing */
2324                 if (!fe->cpu_dai->playback_active
2325                     || !fe->codec_dai->playback_active)
2326                         goto capture;
2327
2328                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2329                 if (paths < 0) {
2330                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2331                                         fe->dai_link->name,  "playback");
2332                         mutex_unlock(&card->mutex);
2333                         return paths;
2334                 }
2335
2336                 /* update any new playback paths */
2337                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2338                 if (new) {
2339                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2340                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2341                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2342                 }
2343
2344                 /* update any old playback paths */
2345                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2346                 if (old) {
2347                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2348                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2349                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2350                 }
2351
2352                 dpcm_path_put(&list);
2353 capture:
2354                 /* skip if FE doesn't have capture capability */
2355                 if (!fe->cpu_dai->driver->capture.channels_min
2356                     || !fe->codec_dai->driver->capture.channels_min)
2357                         continue;
2358
2359                 /* skip if FE isn't currently capturing */
2360                 if (!fe->cpu_dai->capture_active
2361                     || !fe->codec_dai->capture_active)
2362                         continue;
2363
2364                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2365                 if (paths < 0) {
2366                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2367                                         fe->dai_link->name,  "capture");
2368                         mutex_unlock(&card->mutex);
2369                         return paths;
2370                 }
2371
2372                 /* update any new capture paths */
2373                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2374                 if (new) {
2375                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2376                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2377                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2378                 }
2379
2380                 /* update any old capture paths */
2381                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2382                 if (old) {
2383                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2384                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2385                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2386                 }
2387
2388                 dpcm_path_put(&list);
2389         }
2390
2391         mutex_unlock(&card->mutex);
2392         return 0;
2393 }
2394 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2395 {
2396         struct snd_soc_dpcm *dpcm;
2397         struct list_head *clients =
2398                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2399
2400         list_for_each_entry(dpcm, clients, list_be) {
2401
2402                 struct snd_soc_pcm_runtime *be = dpcm->be;
2403                 int i;
2404
2405                 if (be->dai_link->ignore_suspend)
2406                         continue;
2407
2408                 for (i = 0; i < be->num_codecs; i++) {
2409                         struct snd_soc_dai *dai = be->codec_dais[i];
2410                         struct snd_soc_dai_driver *drv = dai->driver;
2411
2412                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2413                                          be->dai_link->name);
2414
2415                         if (drv->ops && drv->ops->digital_mute &&
2416                                                         dai->playback_active)
2417                                 drv->ops->digital_mute(dai, mute);
2418                 }
2419         }
2420
2421         return 0;
2422 }
2423
2424 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2425 {
2426         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2427         struct snd_soc_dpcm *dpcm;
2428         struct snd_soc_dapm_widget_list *list;
2429         int ret;
2430         int stream = fe_substream->stream;
2431
2432         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2433         fe->dpcm[stream].runtime = fe_substream->runtime;
2434
2435         ret = dpcm_path_get(fe, stream, &list);
2436         if (ret < 0) {
2437                 mutex_unlock(&fe->card->mutex);
2438                 return ret;
2439         } else if (ret == 0) {
2440                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2441                         fe->dai_link->name, stream ? "capture" : "playback");
2442         }
2443
2444         /* calculate valid and active FE <-> BE dpcms */
2445         dpcm_process_paths(fe, stream, &list, 1);
2446
2447         ret = dpcm_fe_dai_startup(fe_substream);
2448         if (ret < 0) {
2449                 /* clean up all links */
2450                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2451                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2452
2453                 dpcm_be_disconnect(fe, stream);
2454                 fe->dpcm[stream].runtime = NULL;
2455         }
2456
2457         dpcm_clear_pending_state(fe, stream);
2458         dpcm_path_put(&list);
2459         mutex_unlock(&fe->card->mutex);
2460         return ret;
2461 }
2462
2463 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2464 {
2465         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2466         struct snd_soc_dpcm *dpcm;
2467         int stream = fe_substream->stream, ret;
2468
2469         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2470         ret = dpcm_fe_dai_shutdown(fe_substream);
2471
2472         /* mark FE's links ready to prune */
2473         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2474                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2475
2476         dpcm_be_disconnect(fe, stream);
2477
2478         fe->dpcm[stream].runtime = NULL;
2479         mutex_unlock(&fe->card->mutex);
2480         return ret;
2481 }
2482
2483 /* create a new pcm */
2484 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2485 {
2486         struct snd_soc_platform *platform = rtd->platform;
2487         struct snd_soc_dai *codec_dai;
2488         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2489         struct snd_pcm *pcm;
2490         char new_name[64];
2491         int ret = 0, playback = 0, capture = 0;
2492         int i;
2493
2494         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2495                 playback = rtd->dai_link->dpcm_playback;
2496                 capture = rtd->dai_link->dpcm_capture;
2497         } else {
2498                 for (i = 0; i < rtd->num_codecs; i++) {
2499                         codec_dai = rtd->codec_dais[i];
2500                         if (codec_dai->driver->playback.channels_min)
2501                                 playback = 1;
2502                         if (codec_dai->driver->capture.channels_min)
2503                                 capture = 1;
2504                 }
2505
2506                 capture = capture && cpu_dai->driver->capture.channels_min;
2507                 playback = playback && cpu_dai->driver->playback.channels_min;
2508         }
2509
2510         if (rtd->dai_link->playback_only) {
2511                 playback = 1;
2512                 capture = 0;
2513         }
2514
2515         if (rtd->dai_link->capture_only) {
2516                 playback = 0;
2517                 capture = 1;
2518         }
2519
2520         /* create the PCM */
2521         if (rtd->dai_link->no_pcm) {
2522                 snprintf(new_name, sizeof(new_name), "(%s)",
2523                         rtd->dai_link->stream_name);
2524
2525                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2526                                 playback, capture, &pcm);
2527         } else {
2528                 if (rtd->dai_link->dynamic)
2529                         snprintf(new_name, sizeof(new_name), "%s (*)",
2530                                 rtd->dai_link->stream_name);
2531                 else
2532                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2533                                 rtd->dai_link->stream_name,
2534                                 (rtd->num_codecs > 1) ?
2535                                 "multicodec" : rtd->codec_dai->name, num);
2536
2537                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2538                         capture, &pcm);
2539         }
2540         if (ret < 0) {
2541                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2542                         rtd->dai_link->name);
2543                 return ret;
2544         }
2545         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2546
2547         /* DAPM dai link stream work */
2548         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2549
2550         pcm->nonatomic = rtd->dai_link->nonatomic;
2551         rtd->pcm = pcm;
2552         pcm->private_data = rtd;
2553
2554         if (rtd->dai_link->no_pcm) {
2555                 if (playback)
2556                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2557                 if (capture)
2558                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2559                 goto out;
2560         }
2561
2562         /* ASoC PCM operations */
2563         if (rtd->dai_link->dynamic) {
2564                 rtd->ops.open           = dpcm_fe_dai_open;
2565                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2566                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2567                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2568                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2569                 rtd->ops.close          = dpcm_fe_dai_close;
2570                 rtd->ops.pointer        = soc_pcm_pointer;
2571                 rtd->ops.ioctl          = soc_pcm_ioctl;
2572         } else {
2573                 rtd->ops.open           = soc_pcm_open;
2574                 rtd->ops.hw_params      = soc_pcm_hw_params;
2575                 rtd->ops.prepare        = soc_pcm_prepare;
2576                 rtd->ops.trigger        = soc_pcm_trigger;
2577                 rtd->ops.hw_free        = soc_pcm_hw_free;
2578                 rtd->ops.close          = soc_pcm_close;
2579                 rtd->ops.pointer        = soc_pcm_pointer;
2580                 rtd->ops.ioctl          = soc_pcm_ioctl;
2581         }
2582
2583         if (platform->driver->ops) {
2584                 rtd->ops.ack            = platform->driver->ops->ack;
2585                 rtd->ops.copy           = platform->driver->ops->copy;
2586                 rtd->ops.silence        = platform->driver->ops->silence;
2587                 rtd->ops.page           = platform->driver->ops->page;
2588                 rtd->ops.mmap           = platform->driver->ops->mmap;
2589         }
2590
2591         if (playback)
2592                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2593
2594         if (capture)
2595                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2596
2597         if (platform->driver->pcm_new) {
2598                 ret = platform->driver->pcm_new(rtd);
2599                 if (ret < 0) {
2600                         dev_err(platform->dev,
2601                                 "ASoC: pcm constructor failed: %d\n",
2602                                 ret);
2603                         return ret;
2604                 }
2605         }
2606
2607         pcm->private_free = platform->driver->pcm_free;
2608 out:
2609         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2610                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2611                  cpu_dai->name);
2612         return ret;
2613 }
2614
2615 /* is the current PCM operation for this FE ? */
2616 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2617 {
2618         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2619                 return 1;
2620         return 0;
2621 }
2622 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2623
2624 /* is the current PCM operation for this BE ? */
2625 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2626                 struct snd_soc_pcm_runtime *be, int stream)
2627 {
2628         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2629            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2630                   be->dpcm[stream].runtime_update))
2631                 return 1;
2632         return 0;
2633 }
2634 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2635
2636 /* get the substream for this BE */
2637 struct snd_pcm_substream *
2638         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2639 {
2640         return be->pcm->streams[stream].substream;
2641 }
2642 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2643
2644 /* get the BE runtime state */
2645 enum snd_soc_dpcm_state
2646         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2647 {
2648         return be->dpcm[stream].state;
2649 }
2650 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2651
2652 /* set the BE runtime state */
2653 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2654                 int stream, enum snd_soc_dpcm_state state)
2655 {
2656         be->dpcm[stream].state = state;
2657 }
2658 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2659
2660 /*
2661  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2662  * are not running, paused or suspended for the specified stream direction.
2663  */
2664 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2665                 struct snd_soc_pcm_runtime *be, int stream)
2666 {
2667         struct snd_soc_dpcm *dpcm;
2668         int state;
2669
2670         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2671
2672                 if (dpcm->fe == fe)
2673                         continue;
2674
2675                 state = dpcm->fe->dpcm[stream].state;
2676                 if (state == SND_SOC_DPCM_STATE_START ||
2677                         state == SND_SOC_DPCM_STATE_PAUSED ||
2678                         state == SND_SOC_DPCM_STATE_SUSPEND)
2679                         return 0;
2680         }
2681
2682         /* it's safe to free/stop this BE DAI */
2683         return 1;
2684 }
2685 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2686
2687 /*
2688  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2689  * running, paused or suspended for the specified stream direction.
2690  */
2691 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2692                 struct snd_soc_pcm_runtime *be, int stream)
2693 {
2694         struct snd_soc_dpcm *dpcm;
2695         int state;
2696
2697         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2698
2699                 if (dpcm->fe == fe)
2700                         continue;
2701
2702                 state = dpcm->fe->dpcm[stream].state;
2703                 if (state == SND_SOC_DPCM_STATE_START ||
2704                         state == SND_SOC_DPCM_STATE_PAUSED ||
2705                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2706                         state == SND_SOC_DPCM_STATE_PREPARE)
2707                         return 0;
2708         }
2709
2710         /* it's safe to change hw_params */
2711         return 1;
2712 }
2713 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2714
2715 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2716                 int cmd, struct snd_soc_platform *platform)
2717 {
2718         if (platform->driver->ops && platform->driver->ops->trigger)
2719                 return platform->driver->ops->trigger(substream, cmd);
2720         return 0;
2721 }
2722 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2723
2724 #ifdef CONFIG_DEBUG_FS
2725 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2726 {
2727         switch (state) {
2728         case SND_SOC_DPCM_STATE_NEW:
2729                 return "new";
2730         case SND_SOC_DPCM_STATE_OPEN:
2731                 return "open";
2732         case SND_SOC_DPCM_STATE_HW_PARAMS:
2733                 return "hw_params";
2734         case SND_SOC_DPCM_STATE_PREPARE:
2735                 return "prepare";
2736         case SND_SOC_DPCM_STATE_START:
2737                 return "start";
2738         case SND_SOC_DPCM_STATE_STOP:
2739                 return "stop";
2740         case SND_SOC_DPCM_STATE_SUSPEND:
2741                 return "suspend";
2742         case SND_SOC_DPCM_STATE_PAUSED:
2743                 return "paused";
2744         case SND_SOC_DPCM_STATE_HW_FREE:
2745                 return "hw_free";
2746         case SND_SOC_DPCM_STATE_CLOSE:
2747                 return "close";
2748         }
2749
2750         return "unknown";
2751 }
2752
2753 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2754                                 int stream, char *buf, size_t size)
2755 {
2756         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2757         struct snd_soc_dpcm *dpcm;
2758         ssize_t offset = 0;
2759
2760         /* FE state */
2761         offset += snprintf(buf + offset, size - offset,
2762                         "[%s - %s]\n", fe->dai_link->name,
2763                         stream ? "Capture" : "Playback");
2764
2765         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2766                         dpcm_state_string(fe->dpcm[stream].state));
2767
2768         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2769             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2770                 offset += snprintf(buf + offset, size - offset,
2771                                 "Hardware Params: "
2772                                 "Format = %s, Channels = %d, Rate = %d\n",
2773                                 snd_pcm_format_name(params_format(params)),
2774                                 params_channels(params),
2775                                 params_rate(params));
2776
2777         /* BEs state */
2778         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2779
2780         if (list_empty(&fe->dpcm[stream].be_clients)) {
2781                 offset += snprintf(buf + offset, size - offset,
2782                                 " No active DSP links\n");
2783                 goto out;
2784         }
2785
2786         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2787                 struct snd_soc_pcm_runtime *be = dpcm->be;
2788                 params = &dpcm->hw_params;
2789
2790                 offset += snprintf(buf + offset, size - offset,
2791                                 "- %s\n", be->dai_link->name);
2792
2793                 offset += snprintf(buf + offset, size - offset,
2794                                 "   State: %s\n",
2795                                 dpcm_state_string(be->dpcm[stream].state));
2796
2797                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2798                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2799                         offset += snprintf(buf + offset, size - offset,
2800                                 "   Hardware Params: "
2801                                 "Format = %s, Channels = %d, Rate = %d\n",
2802                                 snd_pcm_format_name(params_format(params)),
2803                                 params_channels(params),
2804                                 params_rate(params));
2805         }
2806
2807 out:
2808         return offset;
2809 }
2810
2811 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2812                                 size_t count, loff_t *ppos)
2813 {
2814         struct snd_soc_pcm_runtime *fe = file->private_data;
2815         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2816         char *buf;
2817
2818         buf = kmalloc(out_count, GFP_KERNEL);
2819         if (!buf)
2820                 return -ENOMEM;
2821
2822         if (fe->cpu_dai->driver->playback.channels_min)
2823                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2824                                         buf + offset, out_count - offset);
2825
2826         if (fe->cpu_dai->driver->capture.channels_min)
2827                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2828                                         buf + offset, out_count - offset);
2829
2830         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2831
2832         kfree(buf);
2833         return ret;
2834 }
2835
2836 static const struct file_operations dpcm_state_fops = {
2837         .open = simple_open,
2838         .read = dpcm_state_read_file,
2839         .llseek = default_llseek,
2840 };
2841
2842 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2843 {
2844         if (!rtd->dai_link)
2845                 return;
2846
2847         if (!rtd->card->debugfs_card_root)
2848                 return;
2849
2850         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2851                         rtd->card->debugfs_card_root);
2852         if (!rtd->debugfs_dpcm_root) {
2853                 dev_dbg(rtd->dev,
2854                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2855                          rtd->dai_link->name);
2856                 return;
2857         }
2858
2859         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2860                                                 rtd->debugfs_dpcm_root,
2861                                                 rtd, &dpcm_state_fops);
2862 }
2863 #endif