sound/soc/soc-pcm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // soc-pcm.c  --  ALSA SoC PCM
   4 //
   5 // Copyright 2005 Wolfson Microelectronics PLC.
   6 // Copyright 2005 Openedhand Ltd.
   7 // Copyright (C) 2010 Slimlogic Ltd.
   8 // Copyright (C) 2010 Texas Instruments Inc.
   9 //
  10 // Authors: Liam Girdwood <lrg@ti.com>
  11 //          Mark Brown <broonie@opensource.wolfsonmicro.com>
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/delay.h>
  16 #include <linux/pinctrl/consumer.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/slab.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/export.h>
  21 #include <linux/debugfs.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/soc-dpcm.h>
  27 #include <sound/soc-link.h>
  28 #include <sound/initval.h>
  29
  30 #define DPCM_MAX_BE_USERS       8
  31
  32 #ifdef CONFIG_DEBUG_FS
  33 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
  34 {
  35         switch (state) {
  36         case SND_SOC_DPCM_STATE_NEW:
  37                 return "new";
  38         case SND_SOC_DPCM_STATE_OPEN:
  39                 return "open";
  40         case SND_SOC_DPCM_STATE_HW_PARAMS:
  41                 return "hw_params";
  42         case SND_SOC_DPCM_STATE_PREPARE:
  43                 return "prepare";
  44         case SND_SOC_DPCM_STATE_START:
  45                 return "start";
  46         case SND_SOC_DPCM_STATE_STOP:
  47                 return "stop";
  48         case SND_SOC_DPCM_STATE_SUSPEND:
  49                 return "suspend";
  50         case SND_SOC_DPCM_STATE_PAUSED:
  51                 return "paused";
  52         case SND_SOC_DPCM_STATE_HW_FREE:
  53                 return "hw_free";
  54         case SND_SOC_DPCM_STATE_CLOSE:
  55                 return "close";
  56         }
  57
  58         return "unknown";
  59 }
  60
  61 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
  62                                int stream, char *buf, size_t size)
  63 {
  64         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
  65         struct snd_soc_dpcm *dpcm;
  66         ssize_t offset = 0;
  67         unsigned long flags;
  68
  69         /* FE state */
  70         offset += scnprintf(buf + offset, size - offset,
  71                            "[%s - %s]\n", fe->dai_link->name,
  72                            stream ? "Capture" : "Playback");
  73
  74         offset += scnprintf(buf + offset, size - offset, "State: %s\n",
  75                            dpcm_state_string(fe->dpcm[stream].state));
  76
  77         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
  78             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
  79                 offset += scnprintf(buf + offset, size - offset,
  80                                    "Hardware Params: "
  81                                    "Format = %s, Channels = %d, Rate = %d\n",
  82                                    snd_pcm_format_name(params_format(params)),
  83                                    params_channels(params),
  84                                    params_rate(params));
  85
  86         /* BEs state */
  87         offset += scnprintf(buf + offset, size - offset, "Backends:\n");
  88
  89         if (list_empty(&fe->dpcm[stream].be_clients)) {
  90                 offset += scnprintf(buf + offset, size - offset,
  91                                    " No active DSP links\n");
  92                 goto out;
  93         }
  94
  95         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
  96         for_each_dpcm_be(fe, stream, dpcm) {
  97                 struct snd_soc_pcm_runtime *be = dpcm->be;
  98                 params = &dpcm->hw_params;
  99
 100                 offset += scnprintf(buf + offset, size - offset,
 101                                    "- %s\n", be->dai_link->name);
 102
 103                 offset += scnprintf(buf + offset, size - offset,
 104                                    "   State: %s\n",
 105                                    dpcm_state_string(be->dpcm[stream].state));
 106
 107                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
 108                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
 109                         offset += scnprintf(buf + offset, size - offset,
 110                                            "   Hardware Params: "
 111                                            "Format = %s, Channels = %d, Rate = %d\n",
 112                                            snd_pcm_format_name(params_format(params)),
 113                                            params_channels(params),
 114                                            params_rate(params));
 115         }
 116         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
 117 out:
 118         return offset;
 119 }
 120
 121 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
 122                                     size_t count, loff_t *ppos)
 123 {
 124         struct snd_soc_pcm_runtime *fe = file->private_data;
 125         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
 126         int stream;
 127         char *buf;
 128
 129         if (fe->num_cpus > 1) {
 130                 dev_err(fe->dev,
 131                         "%s doesn't support Multi CPU yet\n", __func__);
 132                 return -EINVAL;
 133         }
 134
 135         buf = kmalloc(out_count, GFP_KERNEL);
 136         if (!buf)
 137                 return -ENOMEM;
 138
 139         for_each_pcm_streams(stream)
 140                 if (snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream))
 141                         offset += dpcm_show_state(fe, stream,
 142                                                   buf + offset,
 143                                                   out_count - offset);
 144
 145         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
 146
 147         kfree(buf);
 148         return ret;
 149 }
 150
 151 static const struct file_operations dpcm_state_fops = {
 152         .open = simple_open,
 153         .read = dpcm_state_read_file,
 154         .llseek = default_llseek,
 155 };
 156
 157 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
 158 {
 159         if (!rtd->dai_link)
 160                 return;
 161
 162         if (!rtd->dai_link->dynamic)
 163                 return;
 164
 165         if (!rtd->card->debugfs_card_root)
 166                 return;
 167
 168         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
 169                                                     rtd->card->debugfs_card_root);
 170
 171         debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
 172                             rtd, &dpcm_state_fops);
 173 }
 174
 175 static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream)
 176 {
 177         char *name;
 178
 179         name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name,
 180                          stream ? "capture" : "playback");
 181         if (name) {
 182                 dpcm->debugfs_state = debugfs_create_dir(
 183                         name, dpcm->fe->debugfs_dpcm_root);
 184                 debugfs_create_u32("state", 0644, dpcm->debugfs_state,
 185                                    &dpcm->state);
 186                 kfree(name);
 187         }
 188 }
 189
 190 static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 191 {
 192         debugfs_remove_recursive(dpcm->debugfs_state);
 193 }
 194
 195 #else
 196 static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
 197                                              int stream)
 198 {
 199 }
 200
 201 static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 202 {
 203 }
 204 #endif
 205
 206 /**
 207  * snd_soc_runtime_action() - Increment/Decrement active count for
 208  * PCM runtime components
 209  * @rtd: ASoC PCM runtime that is activated
 210  * @stream: Direction of the PCM stream
 211  * @action: Activate stream if 1. Deactivate if -1.
 212  *
 213  * Increments/Decrements the active count for all the DAIs and components
 214  * attached to a PCM runtime.
 215  * Should typically be called when a stream is opened.
 216  *
 217  * Must be called with the rtd->card->pcm_mutex being held
 218  */
 219 void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
 220                             int stream, int action)
 221 {
 222         struct snd_soc_dai *dai;
 223         int i;
 224
 225         lockdep_assert_held(&rtd->card->pcm_mutex);
 226
 227         for_each_rtd_dais(rtd, i, dai)
 228                 snd_soc_dai_action(dai, stream, action);
 229 }
 230 EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
 231
 232 /**
 233  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 234  * @rtd: The ASoC PCM runtime that should be checked.
 235  *
 236  * This function checks whether the power down delay should be ignored for a
 237  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 238  * been configured to ignore the delay, or if none of the components benefits
 239  * from having the delay.
 240  */
 241 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 242 {
 243         struct snd_soc_component *component;
 244         bool ignore = true;
 245         int i;
 246
 247         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 248                 return true;
 249
 250         for_each_rtd_components(rtd, i, component)
 251                 ignore &= !component->driver->use_pmdown_time;
 252
 253         return ignore;
 254 }
 255
 256 /**
 257  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 258  * @substream: the pcm substream
 259  * @hw: the hardware parameters
 260  *
 261  * Sets the substream runtime hardware parameters.
 262  */
 263 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 264         const struct snd_pcm_hardware *hw)
 265 {
 266         struct snd_pcm_runtime *runtime = substream->runtime;
 267         runtime->hw.info = hw->info;
 268         runtime->hw.formats = hw->formats;
 269         runtime->hw.period_bytes_min = hw->period_bytes_min;
 270         runtime->hw.period_bytes_max = hw->period_bytes_max;
 271         runtime->hw.periods_min = hw->periods_min;
 272         runtime->hw.periods_max = hw->periods_max;
 273         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
 274         runtime->hw.fifo_size = hw->fifo_size;
 275         return 0;
 276 }
 277 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 278
 279 /* DPCM stream event, send event to FE and all active BEs. */
 280 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 281         int event)
 282 {
 283         struct snd_soc_dpcm *dpcm;
 284
 285         for_each_dpcm_be(fe, dir, dpcm) {
 286
 287                 struct snd_soc_pcm_runtime *be = dpcm->be;
 288
 289                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 290                                 be->dai_link->name, event, dir);
 291
 292                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
 293                     (be->dpcm[dir].users >= 1))
 294                         continue;
 295
 296                 snd_soc_dapm_stream_event(be, dir, event);
 297         }
 298
 299         snd_soc_dapm_stream_event(fe, dir, event);
 300
 301         return 0;
 302 }
 303
 304 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 305                                         struct snd_soc_dai *soc_dai)
 306 {
 307         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 308         int ret;
 309
 310         if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
 311                                 rtd->dai_link->symmetric_rates)) {
 312                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
 313                                 soc_dai->rate);
 314
 315                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 316                                                 SNDRV_PCM_HW_PARAM_RATE,
 317                                                 soc_dai->rate);
 318                 if (ret < 0) {
 319                         dev_err(soc_dai->dev,
 320                                 "ASoC: Unable to apply rate constraint: %d\n",
 321                                 ret);
 322                         return ret;
 323                 }
 324         }
 325
 326         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
 327                                 rtd->dai_link->symmetric_channels)) {
 328                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
 329                                 soc_dai->channels);
 330
 331                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 332                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
 333                                                 soc_dai->channels);
 334                 if (ret < 0) {
 335                         dev_err(soc_dai->dev,
 336                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
 337                                 ret);
 338                         return ret;
 339                 }
 340         }
 341
 342         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
 343                                 rtd->dai_link->symmetric_samplebits)) {
 344                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
 345                                 soc_dai->sample_bits);
 346
 347                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 348                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
 349                                                 soc_dai->sample_bits);
 350                 if (ret < 0) {
 351                         dev_err(soc_dai->dev,
 352                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
 353                                 ret);
 354                         return ret;
 355                 }
 356         }
 357
 358         return 0;
 359 }
 360
 361 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 362                                 struct snd_pcm_hw_params *params)
 363 {
 364         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 365         struct snd_soc_dai *dai;
 366         struct snd_soc_dai *cpu_dai;
 367         unsigned int rate, channels, sample_bits, symmetry, i;
 368
 369         rate = params_rate(params);
 370         channels = params_channels(params);
 371         sample_bits = snd_pcm_format_physical_width(params_format(params));
 372
 373         /* reject unmatched parameters when applying symmetry */
 374         symmetry = rtd->dai_link->symmetric_rates;
 375
 376         for_each_rtd_cpu_dais(rtd, i, dai)
 377                 symmetry |= dai->driver->symmetric_rates;
 378
 379         if (symmetry) {
 380                 for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 381                         if (cpu_dai->rate && cpu_dai->rate != rate) {
 382                                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
 383                                         cpu_dai->rate, rate);
 384                                 return -EINVAL;
 385                         }
 386                 }
 387         }
 388
 389         symmetry = rtd->dai_link->symmetric_channels;
 390
 391         for_each_rtd_dais(rtd, i, dai)
 392                 symmetry |= dai->driver->symmetric_channels;
 393
 394         if (symmetry) {
 395                 for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 396                         if (cpu_dai->channels &&
 397                             cpu_dai->channels != channels) {
 398                                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
 399                                         cpu_dai->channels, channels);
 400                                 return -EINVAL;
 401                         }
 402                 }
 403         }
 404
 405         symmetry = rtd->dai_link->symmetric_samplebits;
 406
 407         for_each_rtd_dais(rtd, i, dai)
 408                 symmetry |= dai->driver->symmetric_samplebits;
 409
 410         if (symmetry) {
 411                 for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 412                         if (cpu_dai->sample_bits &&
 413                             cpu_dai->sample_bits != sample_bits) {
 414                                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
 415                                         cpu_dai->sample_bits, sample_bits);
 416                                 return -EINVAL;
 417                         }
 418                 }
 419         }
 420
 421         return 0;
 422 }
 423
 424 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
 425 {
 426         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 427         struct snd_soc_dai_link *link = rtd->dai_link;
 428         struct snd_soc_dai *dai;
 429         unsigned int symmetry, i;
 430
 431         symmetry = link->symmetric_rates ||
 432                 link->symmetric_channels ||
 433                 link->symmetric_samplebits;
 434
 435         for_each_rtd_dais(rtd, i, dai)
 436                 symmetry = symmetry ||
 437                         dai->driver->symmetric_rates ||
 438                         dai->driver->symmetric_channels ||
 439                         dai->driver->symmetric_samplebits;
 440
 441         return symmetry;
 442 }
 443
 444 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 445 {
 446         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 447         int ret;
 448
 449         if (!bits)
 450                 return;
 451
 452         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 453         if (ret != 0)
 454                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 455                                  bits, ret);
 456 }
 457
 458 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 459 {
 460         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 461         struct snd_soc_dai *cpu_dai;
 462         struct snd_soc_dai *codec_dai;
 463         struct snd_soc_pcm_stream *pcm_codec, *pcm_cpu;
 464         int stream = substream->stream;
 465         int i;
 466         unsigned int bits = 0, cpu_bits = 0;
 467
 468         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 469                 pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 470
 471                 if (pcm_codec->sig_bits == 0) {
 472                         bits = 0;
 473                         break;
 474                 }
 475                 bits = max(pcm_codec->sig_bits, bits);
 476         }
 477
 478         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 479                 pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 480
 481                 if (pcm_cpu->sig_bits == 0) {
 482                         cpu_bits = 0;
 483                         break;
 484                 }
 485                 cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
 486         }
 487
 488         soc_pcm_set_msb(substream, bits);
 489         soc_pcm_set_msb(substream, cpu_bits);
 490 }
 491
 492 /**
 493  * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
 494  * @rtd: ASoC PCM runtime
 495  * @hw: PCM hardware parameters (output)
 496  * @stream: Direction of the PCM stream
 497  *
 498  * Calculates the subset of stream parameters supported by all DAIs
 499  * associated with the PCM stream.
 500  */
 501 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
 502                             struct snd_pcm_hardware *hw, int stream)
 503 {
 504         struct snd_soc_dai *codec_dai;
 505         struct snd_soc_dai *cpu_dai;
 506         struct snd_soc_pcm_stream *codec_stream;
 507         struct snd_soc_pcm_stream *cpu_stream;
 508         unsigned int chan_min = 0, chan_max = UINT_MAX;
 509         unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
 510         unsigned int rate_min = 0, rate_max = UINT_MAX;
 511         unsigned int cpu_rate_min = 0, cpu_rate_max = UINT_MAX;
 512         unsigned int rates = UINT_MAX, cpu_rates = UINT_MAX;
 513         u64 formats = ULLONG_MAX;
 514         int i;
 515
 516         /* first calculate min/max only for CPUs in the DAI link */
 517         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 518
 519                 /*
 520                  * Skip CPUs which don't support the current stream type.
 521                  * Otherwise, since the rate, channel, and format values will
 522                  * zero in that case, we would have no usable settings left,
 523                  * causing the resulting setup to fail.
 524                  */
 525                 if (!snd_soc_dai_stream_valid(cpu_dai, stream))
 526                         continue;
 527
 528                 cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 529
 530                 cpu_chan_min = max(cpu_chan_min, cpu_stream->channels_min);
 531                 cpu_chan_max = min(cpu_chan_max, cpu_stream->channels_max);
 532                 cpu_rate_min = max(cpu_rate_min, cpu_stream->rate_min);
 533                 cpu_rate_max = min_not_zero(cpu_rate_max, cpu_stream->rate_max);
 534                 formats &= cpu_stream->formats;
 535                 cpu_rates = snd_pcm_rate_mask_intersect(cpu_stream->rates,
 536                                                         cpu_rates);
 537         }
 538
 539         /* second calculate min/max only for CODECs in the DAI link */
 540         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 541
 542                 /*
 543                  * Skip CODECs which don't support the current stream type.
 544                  * Otherwise, since the rate, channel, and format values will
 545                  * zero in that case, we would have no usable settings left,
 546                  * causing the resulting setup to fail.
 547                  */
 548                 if (!snd_soc_dai_stream_valid(codec_dai, stream))
 549                         continue;
 550
 551                 codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 552
 553                 chan_min = max(chan_min, codec_stream->channels_min);
 554                 chan_max = min(chan_max, codec_stream->channels_max);
 555                 rate_min = max(rate_min, codec_stream->rate_min);
 556                 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
 557                 formats &= codec_stream->formats;
 558                 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
 559         }
 560
 561         /* Verify both a valid CPU DAI and a valid CODEC DAI were found */
 562         if (!chan_min || !cpu_chan_min)
 563                 return -EINVAL;
 564
 565         /*
 566          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 567          * connected to CPU DAI(s), use CPU DAI's directly and let
 568          * channel allocation be fixed up later
 569          */
 570         if (rtd->num_codecs > 1) {
 571                 chan_min = cpu_chan_min;
 572                 chan_max = cpu_chan_max;
 573         }
 574
 575         /* finally find a intersection between CODECs and CPUs */
 576         hw->channels_min = max(chan_min, cpu_chan_min);
 577         hw->channels_max = min(chan_max, cpu_chan_max);
 578         hw->formats = formats;
 579         hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_rates);
 580
 581         snd_pcm_hw_limit_rates(hw);
 582
 583         hw->rate_min = max(hw->rate_min, cpu_rate_min);
 584         hw->rate_min = max(hw->rate_min, rate_min);
 585         hw->rate_max = min_not_zero(hw->rate_max, cpu_rate_max);
 586         hw->rate_max = min_not_zero(hw->rate_max, rate_max);
 587
 588         return 0;
 589 }
 590 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
 591
 592 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 593 {
 594         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 595         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 596         u64 formats = hw->formats;
 597
 598         /*
 599          * At least one CPU and one CODEC should match. Otherwise, we should
 600          * have bailed out on a higher level, since there would be no CPU or
 601          * CODEC to support the transfer direction in that case.
 602          */
 603         snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
 604
 605         if (formats)
 606                 hw->formats &= formats;
 607 }
 608
 609 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
 610 {
 611         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 612         struct snd_soc_component *component;
 613         int i, ret = 0;
 614
 615         for_each_rtd_components(rtd, i, component) {
 616                 ret = snd_soc_component_module_get_when_open(component, substream);
 617                 if (ret < 0)
 618                         break;
 619
 620                 ret = snd_soc_component_open(component, substream);
 621                 if (ret < 0)
 622                         break;
 623         }
 624
 625         return ret;
 626 }
 627
 628 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
 629                                     int rollback)
 630 {
 631         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 632         struct snd_soc_component *component;
 633         int i, r, ret = 0;
 634
 635         for_each_rtd_components(rtd, i, component) {
 636                 r = snd_soc_component_close(component, substream, rollback);
 637                 if (r < 0)
 638                         ret = r; /* use last ret */
 639
 640                 snd_soc_component_module_put_when_close(component, substream, rollback);
 641         }
 642
 643         return ret;
 644 }
 645
 646 static int soc_pcm_clean(struct snd_pcm_substream *substream, int rollback)
 647 {
 648         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 649         struct snd_soc_component *component;
 650         struct snd_soc_dai *dai;
 651         int i;
 652
 653         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 654
 655         if (!rollback)
 656                 snd_soc_runtime_deactivate(rtd, substream->stream);
 657
 658         for_each_rtd_dais(rtd, i, dai)
 659                 snd_soc_dai_shutdown(dai, substream, rollback);
 660
 661         snd_soc_link_shutdown(substream, rollback);
 662
 663         soc_pcm_components_close(substream, rollback);
 664
 665         if (!rollback)
 666                 snd_soc_dapm_stream_stop(rtd, substream->stream);
 667
 668         mutex_unlock(&rtd->card->pcm_mutex);
 669
 670         snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
 671
 672         for_each_rtd_components(rtd, i, component)
 673                 if (!snd_soc_component_active(component))
 674                         pinctrl_pm_select_sleep_state(component->dev);
 675
 676         return 0;
 677 }
 678
 679 /*
 680  * Called by ALSA when a PCM substream is closed. Private data can be
 681  * freed here. The cpu DAI, codec DAI, machine and components are also
 682  * shutdown.
 683  */
 684 static int soc_pcm_close(struct snd_pcm_substream *substream)
 685 {
 686         return soc_pcm_clean(substream, 0);
 687 }
 688
 689 /*
 690  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 691  * then initialized and any private data can be allocated. This also calls
 692  * startup for the cpu DAI, component, machine and codec DAI.
 693  */
 694 static int soc_pcm_open(struct snd_pcm_substream *substream)
 695 {
 696         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 697         struct snd_pcm_runtime *runtime = substream->runtime;
 698         struct snd_soc_component *component;
 699         struct snd_soc_dai *dai;
 700         const char *codec_dai_name = "multicodec";
 701         const char *cpu_dai_name = "multicpu";
 702         int i, ret = 0;
 703
 704         for_each_rtd_components(rtd, i, component)
 705                 pinctrl_pm_select_default_state(component->dev);
 706
 707         ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
 708         if (ret < 0)
 709                 goto pm_err;
 710
 711         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 712
 713         ret = soc_pcm_components_open(substream);
 714         if (ret < 0)
 715                 goto err;
 716
 717         ret = snd_soc_link_startup(substream);
 718         if (ret < 0)
 719                 goto err;
 720
 721         /* startup the audio subsystem */
 722         for_each_rtd_dais(rtd, i, dai) {
 723                 ret = snd_soc_dai_startup(dai, substream);
 724                 if (ret < 0)
 725                         goto err;
 726
 727                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 728                         dai->tx_mask = 0;
 729                 else
 730                         dai->rx_mask = 0;
 731         }
 732
 733         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 734         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 735                 goto dynamic;
 736
 737         /* Check that the codec and cpu DAIs are compatible */
 738         soc_pcm_init_runtime_hw(substream);
 739
 740         if (rtd->num_codecs == 1)
 741                 codec_dai_name = asoc_rtd_to_codec(rtd, 0)->name;
 742
 743         if (rtd->num_cpus == 1)
 744                 cpu_dai_name = asoc_rtd_to_cpu(rtd, 0)->name;
 745
 746         if (soc_pcm_has_symmetry(substream))
 747                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 748
 749         ret = -EINVAL;
 750         if (!runtime->hw.rates) {
 751                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 752                         codec_dai_name, cpu_dai_name);
 753                 goto err;
 754         }
 755         if (!runtime->hw.formats) {
 756                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 757                         codec_dai_name, cpu_dai_name);
 758                 goto err;
 759         }
 760         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 761             runtime->hw.channels_min > runtime->hw.channels_max) {
 762                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 763                                 codec_dai_name, cpu_dai_name);
 764                 goto err;
 765         }
 766
 767         soc_pcm_apply_msb(substream);
 768
 769         /* Symmetry only applies if we've already got an active stream. */
 770         for_each_rtd_dais(rtd, i, dai) {
 771                 if (snd_soc_dai_active(dai)) {
 772                         ret = soc_pcm_apply_symmetry(substream, dai);
 773                         if (ret != 0)
 774                                 goto err;
 775                 }
 776         }
 777
 778         pr_debug("ASoC: %s <-> %s info:\n",
 779                  codec_dai_name, cpu_dai_name);
 780         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 781         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 782                  runtime->hw.channels_max);
 783         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 784                  runtime->hw.rate_max);
 785 dynamic:
 786         snd_soc_runtime_activate(rtd, substream->stream);
 787         ret = 0;
 788 err:
 789         mutex_unlock(&rtd->card->pcm_mutex);
 790 pm_err:
 791         if (ret < 0)
 792                 soc_pcm_clean(substream, 1);
 793
 794         return ret;
 795 }
 796
 797 static void codec2codec_close_delayed_work(struct snd_soc_pcm_runtime *rtd)
 798 {
 799         /*
 800          * Currently nothing to do for c2c links
 801          * Since c2c links are internal nodes in the DAPM graph and
 802          * don't interface with the outside world or application layer
 803          * we don't have to do any special handling on close.
 804          */
 805 }
 806
 807 /*
 808  * Called by ALSA when the PCM substream is prepared, can set format, sample
 809  * rate, etc.  This function is non atomic and can be called multiple times,
 810  * it can refer to the runtime info.
 811  */
 812 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 813 {
 814         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 815         struct snd_soc_dai *dai;
 816         int i, ret = 0;
 817
 818         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 819
 820         ret = snd_soc_link_prepare(substream);
 821         if (ret < 0)
 822                 goto out;
 823
 824         ret = snd_soc_pcm_component_prepare(substream);
 825         if (ret < 0)
 826                 goto out;
 827
 828         ret = snd_soc_pcm_dai_prepare(substream);
 829         if (ret < 0) {
 830                 dev_err(rtd->dev, "ASoC: DAI prepare error: %d\n", ret);
 831                 goto out;
 832         }
 833
 834         /* cancel any delayed stream shutdown that is pending */
 835         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 836             rtd->pop_wait) {
 837                 rtd->pop_wait = 0;
 838                 cancel_delayed_work(&rtd->delayed_work);
 839         }
 840
 841         snd_soc_dapm_stream_event(rtd, substream->stream,
 842                         SND_SOC_DAPM_STREAM_START);
 843
 844         for_each_rtd_dais(rtd, i, dai)
 845                 snd_soc_dai_digital_mute(dai, 0, substream->stream);
 846
 847 out:
 848         mutex_unlock(&rtd->card->pcm_mutex);
 849         return ret;
 850 }
 851
 852 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 853                                        unsigned int mask)
 854 {
 855         struct snd_interval *interval;
 856         int channels = hweight_long(mask);
 857
 858         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 859         interval->min = channels;
 860         interval->max = channels;
 861 }
 862
 863 /*
 864  * Called by ALSA when the hardware params are set by application. This
 865  * function can also be called multiple times and can allocate buffers
 866  * (using snd_pcm_lib_* ). It's non-atomic.
 867  */
 868 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 869                                 struct snd_pcm_hw_params *params)
 870 {
 871         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 872         struct snd_soc_component *component;
 873         struct snd_soc_dai *cpu_dai;
 874         struct snd_soc_dai *codec_dai;
 875         int i, ret = 0;
 876
 877         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 878
 879         ret = soc_pcm_params_symmetry(substream, params);
 880         if (ret)
 881                 goto out;
 882
 883         ret = snd_soc_link_hw_params(substream, params);
 884         if (ret < 0)
 885                 goto out;
 886
 887         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 888                 struct snd_pcm_hw_params codec_params;
 889
 890                 /*
 891                  * Skip CODECs which don't support the current stream type,
 892                  * the idea being that if a CODEC is not used for the currently
 893                  * set up transfer direction, it should not need to be
 894                  * configured, especially since the configuration used might
 895                  * not even be supported by that CODEC. There may be cases
 896                  * however where a CODEC needs to be set up although it is
 897                  * actually not being used for the transfer, e.g. if a
 898                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
 899                  * for the DAI link including a playback-only CODEC.
 900                  * If this becomes necessary, we will have to augment the
 901                  * machine driver setup with information on how to act, so
 902                  * we can do the right thing here.
 903                  */
 904                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 905                         continue;
 906
 907                 /* copy params for each codec */
 908                 codec_params = *params;
 909
 910                 /* fixup params based on TDM slot masks */
 911                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 912                     codec_dai->tx_mask)
 913                         soc_pcm_codec_params_fixup(&codec_params,
 914                                                    codec_dai->tx_mask);
 915
 916                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
 917                     codec_dai->rx_mask)
 918                         soc_pcm_codec_params_fixup(&codec_params,
 919                                                    codec_dai->rx_mask);
 920
 921                 ret = snd_soc_dai_hw_params(codec_dai, substream,
 922                                             &codec_params);
 923                 if(ret < 0)
 924                         goto codec_err;
 925
 926                 codec_dai->rate = params_rate(&codec_params);
 927                 codec_dai->channels = params_channels(&codec_params);
 928                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 929                                                 params_format(&codec_params));
 930
 931                 snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
 932         }
 933
 934         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 935                 /*
 936                  * Skip CPUs which don't support the current stream
 937                  * type. See soc_pcm_init_runtime_hw() for more details
 938                  */
 939                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
 940                         continue;
 941
 942                 ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
 943                 if (ret < 0)
 944                         goto interface_err;
 945
 946                 /* store the parameters for each DAI */
 947                 cpu_dai->rate = params_rate(params);
 948                 cpu_dai->channels = params_channels(params);
 949                 cpu_dai->sample_bits =
 950                         snd_pcm_format_physical_width(params_format(params));
 951
 952                 snd_soc_dapm_update_dai(substream, params, cpu_dai);
 953         }
 954
 955         ret = snd_soc_pcm_component_hw_params(substream, params, &component);
 956         if (ret < 0)
 957                 goto component_err;
 958
 959 out:
 960         mutex_unlock(&rtd->card->pcm_mutex);
 961         return ret;
 962
 963 component_err:
 964         snd_soc_pcm_component_hw_free(substream, component);
 965
 966         i = rtd->num_cpus;
 967
 968 interface_err:
 969         for_each_rtd_cpu_dais_rollback(rtd, i, cpu_dai) {
 970                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
 971                         continue;
 972
 973                 snd_soc_dai_hw_free(cpu_dai, substream);
 974                 cpu_dai->rate = 0;
 975         }
 976
 977         i = rtd->num_codecs;
 978
 979 codec_err:
 980         for_each_rtd_codec_dais_rollback(rtd, i, codec_dai) {
 981                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 982                         continue;
 983
 984                 snd_soc_dai_hw_free(codec_dai, substream);
 985                 codec_dai->rate = 0;
 986         }
 987
 988         snd_soc_link_hw_free(substream);
 989
 990         mutex_unlock(&rtd->card->pcm_mutex);
 991         return ret;
 992 }
 993
 994 /*
 995  * Frees resources allocated by hw_params, can be called multiple times
 996  */
 997 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 998 {
 999         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1000         struct snd_soc_dai *dai;
1001         int i;
1002
1003         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
1004
1005         /* clear the corresponding DAIs parameters when going to be inactive */
1006         for_each_rtd_dais(rtd, i, dai) {
1007                 int active = snd_soc_dai_stream_active(dai, substream->stream);
1008
1009                 if (snd_soc_dai_active(dai) == 1) {
1010                         dai->rate = 0;
1011                         dai->channels = 0;
1012                         dai->sample_bits = 0;
1013                 }
1014
1015                 if (active == 1)
1016                         snd_soc_dai_digital_mute(dai, 1, substream->stream);
1017         }
1018
1019         /* free any machine hw params */
1020         snd_soc_link_hw_free(substream);
1021
1022         /* free any component resources */
1023         snd_soc_pcm_component_hw_free(substream, NULL);
1024
1025         /* now free hw params for the DAIs  */
1026         for_each_rtd_dais(rtd, i, dai) {
1027                 if (!snd_soc_dai_stream_valid(dai, substream->stream))
1028                         continue;
1029
1030                 snd_soc_dai_hw_free(dai, substream);
1031         }
1032
1033         mutex_unlock(&rtd->card->pcm_mutex);
1034         return 0;
1035 }
1036
1037 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1038 {
1039         int ret = -EINVAL;
1040
1041         switch (cmd) {
1042         case SNDRV_PCM_TRIGGER_START:
1043         case SNDRV_PCM_TRIGGER_RESUME:
1044         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1045                 ret = snd_soc_link_trigger(substream, cmd);
1046                 if (ret < 0)
1047                         break;
1048
1049                 ret = snd_soc_pcm_component_trigger(substream, cmd);
1050                 if (ret < 0)
1051                         break;
1052
1053                 ret = snd_soc_pcm_dai_trigger(substream, cmd);
1054                 break;
1055         case SNDRV_PCM_TRIGGER_STOP:
1056         case SNDRV_PCM_TRIGGER_SUSPEND:
1057         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1058                 ret = snd_soc_pcm_dai_trigger(substream, cmd);
1059                 if (ret < 0)
1060                         break;
1061
1062                 ret = snd_soc_pcm_component_trigger(substream, cmd);
1063                 if (ret < 0)
1064                         break;
1065
1066                 ret = snd_soc_link_trigger(substream, cmd);
1067                 break;
1068         }
1069
1070         return ret;
1071 }
1072
1073 /*
1074  * soc level wrapper for pointer callback
1075  * If cpu_dai, codec_dai, component driver has the delay callback, then
1076  * the runtime->delay will be updated accordingly.
1077  */
1078 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1079 {
1080         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1081         struct snd_soc_dai *cpu_dai;
1082         struct snd_soc_dai *codec_dai;
1083         struct snd_pcm_runtime *runtime = substream->runtime;
1084         snd_pcm_uframes_t offset = 0;
1085         snd_pcm_sframes_t delay = 0;
1086         snd_pcm_sframes_t codec_delay = 0;
1087         snd_pcm_sframes_t cpu_delay = 0;
1088         int i;
1089
1090         /* clearing the previous total delay */
1091         runtime->delay = 0;
1092
1093         offset = snd_soc_pcm_component_pointer(substream);
1094
1095         /* base delay if assigned in pointer callback */
1096         delay = runtime->delay;
1097
1098         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1099                 cpu_delay = max(cpu_delay,
1100                                 snd_soc_dai_delay(cpu_dai, substream));
1101         }
1102         delay += cpu_delay;
1103
1104         for_each_rtd_codec_dais(rtd, i, codec_dai) {
1105                 codec_delay = max(codec_delay,
1106                                   snd_soc_dai_delay(codec_dai, substream));
1107         }
1108         delay += codec_delay;
1109
1110         runtime->delay = delay;
1111
1112         return offset;
1113 }
1114
1115 /* connect a FE and BE */
1116 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1117                 struct snd_soc_pcm_runtime *be, int stream)
1118 {
1119         struct snd_soc_dpcm *dpcm;
1120         unsigned long flags;
1121
1122         /* only add new dpcms */
1123         for_each_dpcm_be(fe, stream, dpcm) {
1124                 if (dpcm->be == be && dpcm->fe == fe)
1125                         return 0;
1126         }
1127
1128         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1129         if (!dpcm)
1130                 return -ENOMEM;
1131
1132         dpcm->be = be;
1133         dpcm->fe = fe;
1134         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1135         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1136         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1137         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1138         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1139         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1140
1141         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1142                         stream ? "capture" : "playback",  fe->dai_link->name,
1143                         stream ? "<-" : "->", be->dai_link->name);
1144
1145         dpcm_create_debugfs_state(dpcm, stream);
1146
1147         return 1;
1148 }
1149
1150 /* reparent a BE onto another FE */
1151 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1152                         struct snd_soc_pcm_runtime *be, int stream)
1153 {
1154         struct snd_soc_dpcm *dpcm;
1155         struct snd_pcm_substream *fe_substream, *be_substream;
1156
1157         /* reparent if BE is connected to other FEs */
1158         if (!be->dpcm[stream].users)
1159                 return;
1160
1161         be_substream = snd_soc_dpcm_get_substream(be, stream);
1162
1163         for_each_dpcm_fe(be, stream, dpcm) {
1164                 if (dpcm->fe == fe)
1165                         continue;
1166
1167                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1168                         stream ? "capture" : "playback",
1169                         dpcm->fe->dai_link->name,
1170                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1171
1172                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1173                 be_substream->runtime = fe_substream->runtime;
1174                 break;
1175         }
1176 }
1177
1178 /* disconnect a BE and FE */
1179 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1180 {
1181         struct snd_soc_dpcm *dpcm, *d;
1182         unsigned long flags;
1183
1184         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1185                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1186                                 stream ? "capture" : "playback",
1187                                 dpcm->be->dai_link->name);
1188
1189                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1190                         continue;
1191
1192                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1193                         stream ? "capture" : "playback", fe->dai_link->name,
1194                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1195
1196                 /* BEs still alive need new FE */
1197                 dpcm_be_reparent(fe, dpcm->be, stream);
1198
1199                 dpcm_remove_debugfs_state(dpcm);
1200
1201                 spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1202                 list_del(&dpcm->list_be);
1203                 list_del(&dpcm->list_fe);
1204                 spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1205                 kfree(dpcm);
1206         }
1207 }
1208
1209 /* get BE for DAI widget and stream */
1210 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1211                 struct snd_soc_dapm_widget *widget, int stream)
1212 {
1213         struct snd_soc_pcm_runtime *be;
1214         struct snd_soc_dapm_widget *w;
1215         struct snd_soc_dai *dai;
1216         int i;
1217
1218         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1219
1220         for_each_card_rtds(card, be) {
1221
1222                 if (!be->dai_link->no_pcm)
1223                         continue;
1224
1225                 for_each_rtd_dais(be, i, dai) {
1226                         w = snd_soc_dai_get_widget(dai, stream);
1227
1228                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1229                                 w ? w->name : "(not set)");
1230
1231                         if (w == widget)
1232                                 return be;
1233                 }
1234         }
1235
1236         /* Widget provided is not a BE */
1237         return NULL;
1238 }
1239
1240 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1241                 struct snd_soc_dapm_widget *widget)
1242 {
1243         struct snd_soc_dapm_widget *w;
1244         int i;
1245
1246         for_each_dapm_widgets(list, i, w)
1247                 if (widget == w)
1248                         return 1;
1249
1250         return 0;
1251 }
1252
1253 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1254                 enum snd_soc_dapm_direction dir)
1255 {
1256         struct snd_soc_card *card = widget->dapm->card;
1257         struct snd_soc_pcm_runtime *rtd;
1258         int stream;
1259
1260         /* adjust dir to stream */
1261         if (dir == SND_SOC_DAPM_DIR_OUT)
1262                 stream = SNDRV_PCM_STREAM_PLAYBACK;
1263         else
1264                 stream = SNDRV_PCM_STREAM_CAPTURE;
1265
1266         rtd = dpcm_get_be(card, widget, stream);
1267         if (rtd)
1268                 return true;
1269
1270         return false;
1271 }
1272
1273 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1274         int stream, struct snd_soc_dapm_widget_list **list)
1275 {
1276         struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
1277         int paths;
1278
1279         if (fe->num_cpus > 1) {
1280                 dev_err(fe->dev,
1281                         "%s doesn't support Multi CPU yet\n", __func__);
1282                 return -EINVAL;
1283         }
1284
1285         /* get number of valid DAI paths and their widgets */
1286         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1287                         dpcm_end_walk_at_be);
1288
1289         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1290                         stream ? "capture" : "playback");
1291
1292         return paths;
1293 }
1294
1295 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1296 {
1297         snd_soc_dapm_dai_free_widgets(list);
1298 }
1299
1300 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1301                               struct snd_soc_dapm_widget_list *list)
1302 {
1303         struct snd_soc_dapm_widget *widget;
1304         struct snd_soc_dai *dai;
1305         unsigned int i;
1306
1307         /* is there a valid DAI widget for this BE */
1308         for_each_rtd_dais(dpcm->be, i, dai) {
1309                 widget = snd_soc_dai_get_widget(dai, stream);
1310
1311                 /*
1312                  * The BE is pruned only if none of the dai
1313                  * widgets are in the active list.
1314                  */
1315                 if (widget && widget_in_list(list, widget))
1316                         return true;
1317         }
1318
1319         return false;
1320 }
1321
1322 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1323                             struct snd_soc_dapm_widget_list **list_)
1324 {
1325         struct snd_soc_dpcm *dpcm;
1326         int prune = 0;
1327
1328         /* Destroy any old FE <--> BE connections */
1329         for_each_dpcm_be(fe, stream, dpcm) {
1330                 if (dpcm_be_is_active(dpcm, stream, *list_))
1331                         continue;
1332
1333                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1334                         stream ? "capture" : "playback",
1335                         dpcm->be->dai_link->name, fe->dai_link->name);
1336                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1337                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1338                 prune++;
1339         }
1340
1341         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1342         return prune;
1343 }
1344
1345 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1346         struct snd_soc_dapm_widget_list **list_)
1347 {
1348         struct snd_soc_card *card = fe->card;
1349         struct snd_soc_dapm_widget_list *list = *list_;
1350         struct snd_soc_pcm_runtime *be;
1351         struct snd_soc_dapm_widget *widget;
1352         int i, new = 0, err;
1353
1354         /* Create any new FE <--> BE connections */
1355         for_each_dapm_widgets(list, i, widget) {
1356
1357                 switch (widget->id) {
1358                 case snd_soc_dapm_dai_in:
1359                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1360                                 continue;
1361                         break;
1362                 case snd_soc_dapm_dai_out:
1363                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1364                                 continue;
1365                         break;
1366                 default:
1367                         continue;
1368                 }
1369
1370                 /* is there a valid BE rtd for this widget */
1371                 be = dpcm_get_be(card, widget, stream);
1372                 if (!be) {
1373                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1374                                         widget->name);
1375                         continue;
1376                 }
1377
1378                 /* don't connect if FE is not running */
1379                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1380                         continue;
1381
1382                 /* newly connected FE and BE */
1383                 err = dpcm_be_connect(fe, be, stream);
1384                 if (err < 0) {
1385                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1386                                 widget->name);
1387                         break;
1388                 } else if (err == 0) /* already connected */
1389                         continue;
1390
1391                 /* new */
1392                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1393                 new++;
1394         }
1395
1396         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1397         return new;
1398 }
1399
1400 /*
1401  * Find the corresponding BE DAIs that source or sink audio to this
1402  * FE substream.
1403  */
1404 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1405         int stream, struct snd_soc_dapm_widget_list **list, int new)
1406 {
1407         if (new)
1408                 return dpcm_add_paths(fe, stream, list);
1409         else
1410                 return dpcm_prune_paths(fe, stream, list);
1411 }
1412
1413 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1414 {
1415         struct snd_soc_dpcm *dpcm;
1416         unsigned long flags;
1417
1418         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1419         for_each_dpcm_be(fe, stream, dpcm)
1420                 dpcm->be->dpcm[stream].runtime_update =
1421                                                 SND_SOC_DPCM_UPDATE_NO;
1422         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1423 }
1424
1425 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1426         int stream)
1427 {
1428         struct snd_soc_dpcm *dpcm;
1429
1430         /* disable any enabled and non active backends */
1431         for_each_dpcm_be(fe, stream, dpcm) {
1432
1433                 struct snd_soc_pcm_runtime *be = dpcm->be;
1434                 struct snd_pcm_substream *be_substream =
1435                         snd_soc_dpcm_get_substream(be, stream);
1436
1437                 if (be->dpcm[stream].users == 0)
1438                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1439                                 stream ? "capture" : "playback",
1440                                 be->dpcm[stream].state);
1441
1442                 if (--be->dpcm[stream].users != 0)
1443                         continue;
1444
1445                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1446                         continue;
1447
1448                 soc_pcm_close(be_substream);
1449                 be_substream->runtime = NULL;
1450                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1451         }
1452 }
1453
1454 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1455 {
1456         struct snd_soc_dpcm *dpcm;
1457         int err, count = 0;
1458
1459         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1460         for_each_dpcm_be(fe, stream, dpcm) {
1461
1462                 struct snd_soc_pcm_runtime *be = dpcm->be;
1463                 struct snd_pcm_substream *be_substream =
1464                         snd_soc_dpcm_get_substream(be, stream);
1465
1466                 if (!be_substream) {
1467                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1468                                 stream ? "capture" : "playback");
1469                         continue;
1470                 }
1471
1472                 /* is this op for this BE ? */
1473                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1474                         continue;
1475
1476                 /* first time the dpcm is open ? */
1477                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1478                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1479                                 stream ? "capture" : "playback",
1480                                 be->dpcm[stream].state);
1481
1482                 if (be->dpcm[stream].users++ != 0)
1483                         continue;
1484
1485                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1486                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1487                         continue;
1488
1489                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1490                         stream ? "capture" : "playback", be->dai_link->name);
1491
1492                 be_substream->runtime = be->dpcm[stream].runtime;
1493                 err = soc_pcm_open(be_substream);
1494                 if (err < 0) {
1495                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1496                         be->dpcm[stream].users--;
1497                         if (be->dpcm[stream].users < 0)
1498                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1499                                         stream ? "capture" : "playback",
1500                                         be->dpcm[stream].state);
1501
1502                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1503                         goto unwind;
1504                 }
1505
1506                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1507                 count++;
1508         }
1509
1510         return count;
1511
1512 unwind:
1513         /* disable any enabled and non active backends */
1514         for_each_dpcm_be_rollback(fe, stream, dpcm) {
1515                 struct snd_soc_pcm_runtime *be = dpcm->be;
1516                 struct snd_pcm_substream *be_substream =
1517                         snd_soc_dpcm_get_substream(be, stream);
1518
1519                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1520                         continue;
1521
1522                 if (be->dpcm[stream].users == 0)
1523                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1524                                 stream ? "capture" : "playback",
1525                                 be->dpcm[stream].state);
1526
1527                 if (--be->dpcm[stream].users != 0)
1528                         continue;
1529
1530                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1531                         continue;
1532
1533                 soc_pcm_close(be_substream);
1534                 be_substream->runtime = NULL;
1535                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1536         }
1537
1538         return err;
1539 }
1540
1541 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1542                                  struct snd_soc_pcm_stream *stream)
1543 {
1544         runtime->hw.rate_min = stream->rate_min;
1545         runtime->hw.rate_max = min_not_zero(stream->rate_max, UINT_MAX);
1546         runtime->hw.channels_min = stream->channels_min;
1547         runtime->hw.channels_max = stream->channels_max;
1548         if (runtime->hw.formats)
1549                 runtime->hw.formats &= stream->formats;
1550         else
1551                 runtime->hw.formats = stream->formats;
1552         runtime->hw.rates = stream->rates;
1553 }
1554
1555 static void dpcm_runtime_merge_format(struct snd_pcm_substream *substream,
1556                                       u64 *formats)
1557 {
1558         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1559         struct snd_soc_dpcm *dpcm;
1560         struct snd_soc_dai *dai;
1561         int stream = substream->stream;
1562
1563         if (!fe->dai_link->dpcm_merged_format)
1564                 return;
1565
1566         /*
1567          * It returns merged BE codec format
1568          * if FE want to use it (= dpcm_merged_format)
1569          */
1570
1571         for_each_dpcm_be(fe, stream, dpcm) {
1572                 struct snd_soc_pcm_runtime *be = dpcm->be;
1573                 struct snd_soc_pcm_stream *codec_stream;
1574                 int i;
1575
1576                 for_each_rtd_codec_dais(be, i, dai) {
1577                         /*
1578                          * Skip CODECs which don't support the current stream
1579                          * type. See soc_pcm_init_runtime_hw() for more details
1580                          */
1581                         if (!snd_soc_dai_stream_valid(dai, stream))
1582                                 continue;
1583
1584                         codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1585
1586                         *formats &= codec_stream->formats;
1587                 }
1588         }
1589 }
1590
1591 static void dpcm_runtime_merge_chan(struct snd_pcm_substream *substream,
1592                                     unsigned int *channels_min,
1593                                     unsigned int *channels_max)
1594 {
1595         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1596         struct snd_soc_dpcm *dpcm;
1597         int stream = substream->stream;
1598
1599         if (!fe->dai_link->dpcm_merged_chan)
1600                 return;
1601
1602         /*
1603          * It returns merged BE codec channel;
1604          * if FE want to use it (= dpcm_merged_chan)
1605          */
1606
1607         for_each_dpcm_be(fe, stream, dpcm) {
1608                 struct snd_soc_pcm_runtime *be = dpcm->be;
1609                 struct snd_soc_pcm_stream *codec_stream;
1610                 struct snd_soc_pcm_stream *cpu_stream;
1611                 struct snd_soc_dai *dai;
1612                 int i;
1613
1614                 for_each_rtd_cpu_dais(be, i, dai) {
1615                         /*
1616                          * Skip CPUs which don't support the current stream
1617                          * type. See soc_pcm_init_runtime_hw() for more details
1618                          */
1619                         if (!snd_soc_dai_stream_valid(dai, stream))
1620                                 continue;
1621
1622                         cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1623
1624                         *channels_min = max(*channels_min,
1625                                             cpu_stream->channels_min);
1626                         *channels_max = min(*channels_max,
1627                                             cpu_stream->channels_max);
1628                 }
1629
1630                 /*
1631                  * chan min/max cannot be enforced if there are multiple CODEC
1632                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1633                  */
1634                 if (be->num_codecs == 1) {
1635                         codec_stream = snd_soc_dai_get_pcm_stream(asoc_rtd_to_codec(be, 0), stream);
1636
1637                         *channels_min = max(*channels_min,
1638                                             codec_stream->channels_min);
1639                         *channels_max = min(*channels_max,
1640                                             codec_stream->channels_max);
1641                 }
1642         }
1643 }
1644
1645 static void dpcm_runtime_merge_rate(struct snd_pcm_substream *substream,
1646                                     unsigned int *rates,
1647                                     unsigned int *rate_min,
1648                                     unsigned int *rate_max)
1649 {
1650         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1651         struct snd_soc_dpcm *dpcm;
1652         int stream = substream->stream;
1653
1654         if (!fe->dai_link->dpcm_merged_rate)
1655                 return;
1656
1657         /*
1658          * It returns merged BE codec channel;
1659          * if FE want to use it (= dpcm_merged_chan)
1660          */
1661
1662         for_each_dpcm_be(fe, stream, dpcm) {
1663                 struct snd_soc_pcm_runtime *be = dpcm->be;
1664                 struct snd_soc_pcm_stream *pcm;
1665                 struct snd_soc_dai *dai;
1666                 int i;
1667
1668                 for_each_rtd_dais(be, i, dai) {
1669                         /*
1670                          * Skip DAIs which don't support the current stream
1671                          * type. See soc_pcm_init_runtime_hw() for more details
1672                          */
1673                         if (!snd_soc_dai_stream_valid(dai, stream))
1674                                 continue;
1675
1676                         pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1677
1678                         *rate_min = max(*rate_min, pcm->rate_min);
1679                         *rate_max = min_not_zero(*rate_max, pcm->rate_max);
1680                         *rates = snd_pcm_rate_mask_intersect(*rates, pcm->rates);
1681                 }
1682         }
1683 }
1684
1685 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1686 {
1687         struct snd_pcm_runtime *runtime = substream->runtime;
1688         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1689         struct snd_soc_dai *cpu_dai;
1690         int i;
1691
1692         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1693                 /*
1694                  * Skip CPUs which don't support the current stream
1695                  * type. See soc_pcm_init_runtime_hw() for more details
1696                  */
1697                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1698                         continue;
1699
1700                 dpcm_init_runtime_hw(runtime,
1701                         snd_soc_dai_get_pcm_stream(cpu_dai,
1702                                                    substream->stream));
1703         }
1704
1705         dpcm_runtime_merge_format(substream, &runtime->hw.formats);
1706         dpcm_runtime_merge_chan(substream, &runtime->hw.channels_min,
1707                                 &runtime->hw.channels_max);
1708         dpcm_runtime_merge_rate(substream, &runtime->hw.rates,
1709                                 &runtime->hw.rate_min, &runtime->hw.rate_max);
1710 }
1711
1712 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1713
1714 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1715  * for avoiding the race with trigger callback.
1716  * If the state is unset and a trigger is pending while the previous operation,
1717  * process the pending trigger action here.
1718  */
1719 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1720                                      int stream, enum snd_soc_dpcm_update state)
1721 {
1722         struct snd_pcm_substream *substream =
1723                 snd_soc_dpcm_get_substream(fe, stream);
1724
1725         snd_pcm_stream_lock_irq(substream);
1726         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1727                 dpcm_fe_dai_do_trigger(substream,
1728                                        fe->dpcm[stream].trigger_pending - 1);
1729                 fe->dpcm[stream].trigger_pending = 0;
1730         }
1731         fe->dpcm[stream].runtime_update = state;
1732         snd_pcm_stream_unlock_irq(substream);
1733 }
1734
1735 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1736                                int stream)
1737 {
1738         struct snd_soc_dpcm *dpcm;
1739         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1740         struct snd_soc_dai *fe_cpu_dai;
1741         int err;
1742         int i;
1743
1744         /* apply symmetry for FE */
1745         if (soc_pcm_has_symmetry(fe_substream))
1746                 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1747
1748         for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1749                 /* Symmetry only applies if we've got an active stream. */
1750                 if (snd_soc_dai_active(fe_cpu_dai)) {
1751                         err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1752                         if (err < 0)
1753                                 return err;
1754                 }
1755         }
1756
1757         /* apply symmetry for BE */
1758         for_each_dpcm_be(fe, stream, dpcm) {
1759                 struct snd_soc_pcm_runtime *be = dpcm->be;
1760                 struct snd_pcm_substream *be_substream =
1761                         snd_soc_dpcm_get_substream(be, stream);
1762                 struct snd_soc_pcm_runtime *rtd;
1763                 struct snd_soc_dai *dai;
1764                 int i;
1765
1766                 /* A backend may not have the requested substream */
1767                 if (!be_substream)
1768                         continue;
1769
1770                 rtd = asoc_substream_to_rtd(be_substream);
1771                 if (rtd->dai_link->be_hw_params_fixup)
1772                         continue;
1773
1774                 if (soc_pcm_has_symmetry(be_substream))
1775                         be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1776
1777                 /* Symmetry only applies if we've got an active stream. */
1778                 for_each_rtd_dais(rtd, i, dai) {
1779                         if (snd_soc_dai_active(dai)) {
1780                                 err = soc_pcm_apply_symmetry(fe_substream, dai);
1781                                 if (err < 0)
1782                                         return err;
1783                         }
1784                 }
1785         }
1786
1787         return 0;
1788 }
1789
1790 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1791 {
1792         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1793         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1794         int stream = fe_substream->stream, ret = 0;
1795
1796         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1797
1798         ret = dpcm_be_dai_startup(fe, stream);
1799         if (ret < 0) {
1800                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1801                 goto be_err;
1802         }
1803
1804         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1805
1806         /* start the DAI frontend */
1807         ret = soc_pcm_open(fe_substream);
1808         if (ret < 0) {
1809                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1810                 goto unwind;
1811         }
1812
1813         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1814
1815         dpcm_set_fe_runtime(fe_substream);
1816         snd_pcm_limit_hw_rates(runtime);
1817
1818         ret = dpcm_apply_symmetry(fe_substream, stream);
1819         if (ret < 0)
1820                 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1821                         ret);
1822
1823 unwind:
1824         if (ret < 0)
1825                 dpcm_be_dai_startup_unwind(fe, stream);
1826 be_err:
1827         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1828         return ret;
1829 }
1830
1831 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1832 {
1833         struct snd_soc_dpcm *dpcm;
1834
1835         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1836         for_each_dpcm_be(fe, stream, dpcm) {
1837
1838                 struct snd_soc_pcm_runtime *be = dpcm->be;
1839                 struct snd_pcm_substream *be_substream =
1840                         snd_soc_dpcm_get_substream(be, stream);
1841
1842                 /* is this op for this BE ? */
1843                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1844                         continue;
1845
1846                 if (be->dpcm[stream].users == 0)
1847                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1848                                 stream ? "capture" : "playback",
1849                                 be->dpcm[stream].state);
1850
1851                 if (--be->dpcm[stream].users != 0)
1852                         continue;
1853
1854                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1855                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)) {
1856                         soc_pcm_hw_free(be_substream);
1857                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1858                 }
1859
1860                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1861                         be->dai_link->name);
1862
1863                 soc_pcm_close(be_substream);
1864                 be_substream->runtime = NULL;
1865
1866                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1867         }
1868         return 0;
1869 }
1870
1871 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1872 {
1873         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1874         int stream = substream->stream;
1875
1876         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1877
1878         /* shutdown the BEs */
1879         dpcm_be_dai_shutdown(fe, stream);
1880
1881         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1882
1883         /* now shutdown the frontend */
1884         soc_pcm_close(substream);
1885
1886         /* run the stream event for each BE */
1887         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1888
1889         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1890         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1891         return 0;
1892 }
1893
1894 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1895 {
1896         struct snd_soc_dpcm *dpcm;
1897
1898         /* only hw_params backends that are either sinks or sources
1899          * to this frontend DAI */
1900         for_each_dpcm_be(fe, stream, dpcm) {
1901
1902                 struct snd_soc_pcm_runtime *be = dpcm->be;
1903                 struct snd_pcm_substream *be_substream =
1904                         snd_soc_dpcm_get_substream(be, stream);
1905
1906                 /* is this op for this BE ? */
1907                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1908                         continue;
1909
1910                 /* only free hw when no longer used - check all FEs */
1911                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1912                                 continue;
1913
1914                 /* do not free hw if this BE is used by other FE */
1915                 if (be->dpcm[stream].users > 1)
1916                         continue;
1917
1918                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1919                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1920                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1921                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1922                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1923                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1924                         continue;
1925
1926                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1927                         be->dai_link->name);
1928
1929                 soc_pcm_hw_free(be_substream);
1930
1931                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1932         }
1933
1934         return 0;
1935 }
1936
1937 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1938 {
1939         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1940         int err, stream = substream->stream;
1941
1942         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1943         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1944
1945         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1946
1947         /* call hw_free on the frontend */
1948         err = soc_pcm_hw_free(substream);
1949         if (err < 0)
1950                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1951                         fe->dai_link->name);
1952
1953         /* only hw_params backends that are either sinks or sources
1954          * to this frontend DAI */
1955         err = dpcm_be_dai_hw_free(fe, stream);
1956
1957         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1958         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1959
1960         mutex_unlock(&fe->card->mutex);
1961         return 0;
1962 }
1963
1964 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1965 {
1966         struct snd_soc_dpcm *dpcm;
1967         int ret;
1968
1969         for_each_dpcm_be(fe, stream, dpcm) {
1970
1971                 struct snd_soc_pcm_runtime *be = dpcm->be;
1972                 struct snd_pcm_substream *be_substream =
1973                         snd_soc_dpcm_get_substream(be, stream);
1974
1975                 /* is this op for this BE ? */
1976                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1977                         continue;
1978
1979                 /* copy params for each dpcm */
1980                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1981                                 sizeof(struct snd_pcm_hw_params));
1982
1983                 /* perform any hw_params fixups */
1984                 ret = snd_soc_link_be_hw_params_fixup(be, &dpcm->hw_params);
1985                 if (ret < 0)
1986                         goto unwind;
1987
1988                 /* copy the fixed-up hw params for BE dai */
1989                 memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
1990                        sizeof(struct snd_pcm_hw_params));
1991
1992                 /* only allow hw_params() if no connected FEs are running */
1993                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1994                         continue;
1995
1996                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1997                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1998                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1999                         continue;
2000
2001                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2002                         be->dai_link->name);
2003
2004                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
2005                 if (ret < 0) {
2006                         dev_err(dpcm->be->dev,
2007                                 "ASoC: hw_params BE failed %d\n", ret);
2008                         goto unwind;
2009                 }
2010
2011                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2012         }
2013         return 0;
2014
2015 unwind:
2016         /* disable any enabled and non active backends */
2017         for_each_dpcm_be_rollback(fe, stream, dpcm) {
2018                 struct snd_soc_pcm_runtime *be = dpcm->be;
2019                 struct snd_pcm_substream *be_substream =
2020                         snd_soc_dpcm_get_substream(be, stream);
2021
2022                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2023                         continue;
2024
2025                 /* only allow hw_free() if no connected FEs are running */
2026                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2027                         continue;
2028
2029                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2030                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2031                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2032                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2033                         continue;
2034
2035                 soc_pcm_hw_free(be_substream);
2036         }
2037
2038         return ret;
2039 }
2040
2041 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2042                                  struct snd_pcm_hw_params *params)
2043 {
2044         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2045         int ret, stream = substream->stream;
2046
2047         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2048         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2049
2050         memcpy(&fe->dpcm[stream].hw_params, params,
2051                         sizeof(struct snd_pcm_hw_params));
2052         ret = dpcm_be_dai_hw_params(fe, stream);
2053         if (ret < 0) {
2054                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
2055                 goto out;
2056         }
2057
2058         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2059                         fe->dai_link->name, params_rate(params),
2060                         params_channels(params), params_format(params));
2061
2062         /* call hw_params on the frontend */
2063         ret = soc_pcm_hw_params(substream, params);
2064         if (ret < 0) {
2065                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
2066                 dpcm_be_dai_hw_free(fe, stream);
2067          } else
2068                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2069
2070 out:
2071         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2072         mutex_unlock(&fe->card->mutex);
2073         return ret;
2074 }
2075
2076 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2077                 struct snd_pcm_substream *substream, int cmd)
2078 {
2079         int ret;
2080
2081         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2082                         dpcm->be->dai_link->name, cmd);
2083
2084         ret = soc_pcm_trigger(substream, cmd);
2085         if (ret < 0)
2086                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2087
2088         return ret;
2089 }
2090
2091 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2092                                int cmd)
2093 {
2094         struct snd_soc_dpcm *dpcm;
2095         int ret = 0;
2096
2097         for_each_dpcm_be(fe, stream, dpcm) {
2098
2099                 struct snd_soc_pcm_runtime *be = dpcm->be;
2100                 struct snd_pcm_substream *be_substream =
2101                         snd_soc_dpcm_get_substream(be, stream);
2102
2103                 /* is this op for this BE ? */
2104                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2105                         continue;
2106
2107                 switch (cmd) {
2108                 case SNDRV_PCM_TRIGGER_START:
2109                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2110                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2111                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2112                                 continue;
2113
2114                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2115                         if (ret)
2116                                 return ret;
2117
2118                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2119                         break;
2120                 case SNDRV_PCM_TRIGGER_RESUME:
2121                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2122                                 continue;
2123
2124                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2125                         if (ret)
2126                                 return ret;
2127
2128                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2129                         break;
2130                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2131                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2132                                 continue;
2133
2134                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2135                         if (ret)
2136                                 return ret;
2137
2138                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2139                         break;
2140                 case SNDRV_PCM_TRIGGER_STOP:
2141                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2142                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2143                                 continue;
2144
2145                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2146                                 continue;
2147
2148                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2149                         if (ret)
2150                                 return ret;
2151
2152                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2153                         break;
2154                 case SNDRV_PCM_TRIGGER_SUSPEND:
2155                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2156                                 continue;
2157
2158                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2159                                 continue;
2160
2161                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2162                         if (ret)
2163                                 return ret;
2164
2165                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2166                         break;
2167                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2168                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2169                                 continue;
2170
2171                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2172                                 continue;
2173
2174                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2175                         if (ret)
2176                                 return ret;
2177
2178                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2179                         break;
2180                 }
2181         }
2182
2183         return ret;
2184 }
2185 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2186
2187 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2188                                   int cmd, bool fe_first)
2189 {
2190         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2191         int ret;
2192
2193         /* call trigger on the frontend before the backend. */
2194         if (fe_first) {
2195                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2196                         fe->dai_link->name, cmd);
2197
2198                 ret = soc_pcm_trigger(substream, cmd);
2199                 if (ret < 0)
2200                         return ret;
2201
2202                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2203                 return ret;
2204         }
2205
2206         /* call trigger on the frontend after the backend. */
2207         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2208         if (ret < 0)
2209                 return ret;
2210
2211         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2212                 fe->dai_link->name, cmd);
2213
2214         ret = soc_pcm_trigger(substream, cmd);
2215
2216         return ret;
2217 }
2218
2219 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2220 {
2221         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2222         int stream = substream->stream;
2223         int ret = 0;
2224         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2225
2226         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2227
2228         switch (trigger) {
2229         case SND_SOC_DPCM_TRIGGER_PRE:
2230                 switch (cmd) {
2231                 case SNDRV_PCM_TRIGGER_START:
2232                 case SNDRV_PCM_TRIGGER_RESUME:
2233                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2234                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2235                         break;
2236                 case SNDRV_PCM_TRIGGER_STOP:
2237                 case SNDRV_PCM_TRIGGER_SUSPEND:
2238                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2239                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2240                         break;
2241                 default:
2242                         ret = -EINVAL;
2243                         break;
2244                 }
2245                 break;
2246         case SND_SOC_DPCM_TRIGGER_POST:
2247                 switch (cmd) {
2248                 case SNDRV_PCM_TRIGGER_START:
2249                 case SNDRV_PCM_TRIGGER_RESUME:
2250                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2251                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2252                         break;
2253                 case SNDRV_PCM_TRIGGER_STOP:
2254                 case SNDRV_PCM_TRIGGER_SUSPEND:
2255                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2256                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2257                         break;
2258                 default:
2259                         ret = -EINVAL;
2260                         break;
2261                 }
2262                 break;
2263         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2264                 /* bespoke trigger() - handles both FE and BEs */
2265
2266                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2267                                 fe->dai_link->name, cmd);
2268
2269                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2270                 break;
2271         default:
2272                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2273                                 fe->dai_link->name);
2274                 ret = -EINVAL;
2275                 goto out;
2276         }
2277
2278         if (ret < 0) {
2279                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2280                         cmd, ret);
2281                 goto out;
2282         }
2283
2284         switch (cmd) {
2285         case SNDRV_PCM_TRIGGER_START:
2286         case SNDRV_PCM_TRIGGER_RESUME:
2287         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2288                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2289                 break;
2290         case SNDRV_PCM_TRIGGER_STOP:
2291         case SNDRV_PCM_TRIGGER_SUSPEND:
2292                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2293                 break;
2294         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2295                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2296                 break;
2297         }
2298
2299 out:
2300         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2301         return ret;
2302 }
2303
2304 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2305 {
2306         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2307         int stream = substream->stream;
2308
2309         /* if FE's runtime_update is already set, we're in race;
2310          * process this trigger later at exit
2311          */
2312         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2313                 fe->dpcm[stream].trigger_pending = cmd + 1;
2314                 return 0; /* delayed, assuming it's successful */
2315         }
2316
2317         /* we're alone, let's trigger */
2318         return dpcm_fe_dai_do_trigger(substream, cmd);
2319 }
2320
2321 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2322 {
2323         struct snd_soc_dpcm *dpcm;
2324         int ret = 0;
2325
2326         for_each_dpcm_be(fe, stream, dpcm) {
2327
2328                 struct snd_soc_pcm_runtime *be = dpcm->be;
2329                 struct snd_pcm_substream *be_substream =
2330                         snd_soc_dpcm_get_substream(be, stream);
2331
2332                 /* is this op for this BE ? */
2333                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2334                         continue;
2335
2336                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2337                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2338                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2339                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2340                         continue;
2341
2342                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2343                         be->dai_link->name);
2344
2345                 ret = soc_pcm_prepare(be_substream);
2346                 if (ret < 0) {
2347                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2348                                 ret);
2349                         break;
2350                 }
2351
2352                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2353         }
2354         return ret;
2355 }
2356
2357 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2358 {
2359         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2360         int stream = substream->stream, ret = 0;
2361
2362         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2363
2364         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2365
2366         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2367
2368         /* there is no point preparing this FE if there are no BEs */
2369         if (list_empty(&fe->dpcm[stream].be_clients)) {
2370                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2371                                 fe->dai_link->name);
2372                 ret = -EINVAL;
2373                 goto out;
2374         }
2375
2376         ret = dpcm_be_dai_prepare(fe, stream);
2377         if (ret < 0)
2378                 goto out;
2379
2380         /* call prepare on the frontend */
2381         ret = soc_pcm_prepare(substream);
2382         if (ret < 0) {
2383                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2384                         fe->dai_link->name);
2385                 goto out;
2386         }
2387
2388         /* run the stream event for each BE */
2389         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2390         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2391
2392 out:
2393         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2394         mutex_unlock(&fe->card->mutex);
2395
2396         return ret;
2397 }
2398
2399 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2400 {
2401         struct snd_pcm_substream *substream =
2402                 snd_soc_dpcm_get_substream(fe, stream);
2403         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2404         int err;
2405
2406         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2407                         stream ? "capture" : "playback", fe->dai_link->name);
2408
2409         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2410                 /* call bespoke trigger - FE takes care of all BE triggers */
2411                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2412                                 fe->dai_link->name);
2413
2414                 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2415                 if (err < 0)
2416                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2417         } else {
2418                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2419                         fe->dai_link->name);
2420
2421                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2422                 if (err < 0)
2423                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2424         }
2425
2426         err = dpcm_be_dai_hw_free(fe, stream);
2427         if (err < 0)
2428                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2429
2430         err = dpcm_be_dai_shutdown(fe, stream);
2431         if (err < 0)
2432                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2433
2434         /* run the stream event for each BE */
2435         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2436
2437         return 0;
2438 }
2439
2440 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2441 {
2442         struct snd_pcm_substream *substream =
2443                 snd_soc_dpcm_get_substream(fe, stream);
2444         struct snd_soc_dpcm *dpcm;
2445         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2446         int ret;
2447         unsigned long flags;
2448
2449         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2450                         stream ? "capture" : "playback", fe->dai_link->name);
2451
2452         /* Only start the BE if the FE is ready */
2453         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2454                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2455                 return -EINVAL;
2456
2457         /* startup must always be called for new BEs */
2458         ret = dpcm_be_dai_startup(fe, stream);
2459         if (ret < 0)
2460                 goto disconnect;
2461
2462         /* keep going if FE state is > open */
2463         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2464                 return 0;
2465
2466         ret = dpcm_be_dai_hw_params(fe, stream);
2467         if (ret < 0)
2468                 goto close;
2469
2470         /* keep going if FE state is > hw_params */
2471         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2472                 return 0;
2473
2474
2475         ret = dpcm_be_dai_prepare(fe, stream);
2476         if (ret < 0)
2477                 goto hw_free;
2478
2479         /* run the stream event for each BE */
2480         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2481
2482         /* keep going if FE state is > prepare */
2483         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2484                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2485                 return 0;
2486
2487         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2488                 /* call trigger on the frontend - FE takes care of all BE triggers */
2489                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2490                                 fe->dai_link->name);
2491
2492                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2493                 if (ret < 0) {
2494                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2495                         goto hw_free;
2496                 }
2497         } else {
2498                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2499                         fe->dai_link->name);
2500
2501                 ret = dpcm_be_dai_trigger(fe, stream,
2502                                         SNDRV_PCM_TRIGGER_START);
2503                 if (ret < 0) {
2504                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2505                         goto hw_free;
2506                 }
2507         }
2508
2509         return 0;
2510
2511 hw_free:
2512         dpcm_be_dai_hw_free(fe, stream);
2513 close:
2514         dpcm_be_dai_shutdown(fe, stream);
2515 disconnect:
2516         /* disconnect any closed BEs */
2517         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
2518         for_each_dpcm_be(fe, stream, dpcm) {
2519                 struct snd_soc_pcm_runtime *be = dpcm->be;
2520                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2521                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2522         }
2523         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
2524
2525         return ret;
2526 }
2527
2528 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2529 {
2530         struct snd_soc_dapm_widget_list *list;
2531         int stream;
2532         int count, paths;
2533         int ret;
2534
2535         if (!fe->dai_link->dynamic)
2536                 return 0;
2537
2538         if (fe->num_cpus > 1) {
2539                 dev_err(fe->dev,
2540                         "%s doesn't support Multi CPU yet\n", __func__);
2541                 return -EINVAL;
2542         }
2543
2544         /* only check active links */
2545         if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
2546                 return 0;
2547
2548         /* DAPM sync will call this to update DSP paths */
2549         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2550                 new ? "new" : "old", fe->dai_link->name);
2551
2552         for_each_pcm_streams(stream) {
2553
2554                 /* skip if FE doesn't have playback/capture capability */
2555                 if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
2556                     !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
2557                         continue;
2558
2559                 /* skip if FE isn't currently playing/capturing */
2560                 if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
2561                     !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
2562                         continue;
2563
2564                 paths = dpcm_path_get(fe, stream, &list);
2565                 if (paths < 0) {
2566                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2567                                  fe->dai_link->name,
2568                                  stream == SNDRV_PCM_STREAM_PLAYBACK ?
2569                                  "playback" : "capture");
2570                         return paths;
2571                 }
2572
2573                 /* update any playback/capture paths */
2574                 count = dpcm_process_paths(fe, stream, &list, new);
2575                 if (count) {
2576                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2577                         if (new)
2578                                 ret = dpcm_run_update_startup(fe, stream);
2579                         else
2580                                 ret = dpcm_run_update_shutdown(fe, stream);
2581                         if (ret < 0)
2582                                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2583                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2584
2585                         dpcm_clear_pending_state(fe, stream);
2586                         dpcm_be_disconnect(fe, stream);
2587                 }
2588
2589                 dpcm_path_put(&list);
2590         }
2591
2592         return 0;
2593 }
2594
2595 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2596  * any DAI links.
2597  */
2598 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2599 {
2600         struct snd_soc_pcm_runtime *fe;
2601         int ret = 0;
2602
2603         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2604         /* shutdown all old paths first */
2605         for_each_card_rtds(card, fe) {
2606                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2607                 if (ret)
2608                         goto out;
2609         }
2610
2611         /* bring new paths up */
2612         for_each_card_rtds(card, fe) {
2613                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2614                 if (ret)
2615                         goto out;
2616         }
2617
2618 out:
2619         mutex_unlock(&card->mutex);
2620         return ret;
2621 }
2622 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2623
2624 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2625 {
2626         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2627         struct snd_soc_dpcm *dpcm;
2628         int stream = fe_substream->stream;
2629
2630         /* mark FE's links ready to prune */
2631         for_each_dpcm_be(fe, stream, dpcm)
2632                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2633
2634         dpcm_be_disconnect(fe, stream);
2635
2636         fe->dpcm[stream].runtime = NULL;
2637 }
2638
2639 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2640 {
2641         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2642         int ret;
2643
2644         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2645         ret = dpcm_fe_dai_shutdown(fe_substream);
2646
2647         dpcm_fe_dai_cleanup(fe_substream);
2648
2649         mutex_unlock(&fe->card->mutex);
2650         return ret;
2651 }
2652
2653 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2654 {
2655         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2656         struct snd_soc_dapm_widget_list *list;
2657         int ret;
2658         int stream = fe_substream->stream;
2659
2660         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2661         fe->dpcm[stream].runtime = fe_substream->runtime;
2662
2663         ret = dpcm_path_get(fe, stream, &list);
2664         if (ret < 0) {
2665                 goto open_end;
2666         } else if (ret == 0) {
2667                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2668                         fe->dai_link->name, stream ? "capture" : "playback");
2669         }
2670
2671         /* calculate valid and active FE <-> BE dpcms */
2672         dpcm_process_paths(fe, stream, &list, 1);
2673
2674         ret = dpcm_fe_dai_startup(fe_substream);
2675         if (ret < 0)
2676                 dpcm_fe_dai_cleanup(fe_substream);
2677
2678         dpcm_clear_pending_state(fe, stream);
2679         dpcm_path_put(&list);
2680 open_end:
2681         mutex_unlock(&fe->card->mutex);
2682         return ret;
2683 }
2684
2685 /* create a new pcm */
2686 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2687 {
2688         struct snd_soc_dai *codec_dai;
2689         struct snd_soc_dai *cpu_dai;
2690         struct snd_soc_component *component;
2691         struct snd_pcm *pcm;
2692         char new_name[64];
2693         int ret = 0, playback = 0, capture = 0;
2694         int stream;
2695         int i;
2696
2697         if (rtd->dai_link->dynamic && rtd->num_cpus > 1) {
2698                 dev_err(rtd->dev,
2699                         "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2700                 return -EINVAL;
2701         }
2702
2703         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2704                 if (rtd->dai_link->dpcm_playback) {
2705                         stream = SNDRV_PCM_STREAM_PLAYBACK;
2706
2707                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2708                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2709                                         playback = 1;
2710                                         break;
2711                                 }
2712                         }
2713
2714                         if (!playback) {
2715                                 dev_err(rtd->card->dev,
2716                                         "No CPU DAIs support playback for stream %s\n",
2717                                         rtd->dai_link->stream_name);
2718                                 return -EINVAL;
2719                         }
2720                 }
2721                 if (rtd->dai_link->dpcm_capture) {
2722                         stream = SNDRV_PCM_STREAM_CAPTURE;
2723
2724                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2725                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2726                                         capture = 1;
2727                                         break;
2728                                 }
2729                         }
2730
2731                         if (!capture) {
2732                                 dev_err(rtd->card->dev,
2733                                         "No CPU DAIs support capture for stream %s\n",
2734                                         rtd->dai_link->stream_name);
2735                                 return -EINVAL;
2736                         }
2737                 }
2738         } else {
2739                 /* Adapt stream for codec2codec links */
2740                 int cpu_capture = rtd->dai_link->params ?
2741                         SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
2742                 int cpu_playback = rtd->dai_link->params ?
2743                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2744
2745                 for_each_rtd_codec_dais(rtd, i, codec_dai) {
2746                         if (rtd->num_cpus == 1) {
2747                                 cpu_dai = asoc_rtd_to_cpu(rtd, 0);
2748                         } else if (rtd->num_cpus == rtd->num_codecs) {
2749                                 cpu_dai = asoc_rtd_to_cpu(rtd, i);
2750                         } else {
2751                                 dev_err(rtd->card->dev,
2752                                         "N cpus to M codecs link is not supported yet\n");
2753                                 return -EINVAL;
2754                         }
2755
2756                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2757                             snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2758                                 playback = 1;
2759                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2760                             snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2761                                 capture = 1;
2762                 }
2763         }
2764
2765         if (rtd->dai_link->playback_only) {
2766                 playback = 1;
2767                 capture = 0;
2768         }
2769
2770         if (rtd->dai_link->capture_only) {
2771                 playback = 0;
2772                 capture = 1;
2773         }
2774
2775         /* create the PCM */
2776         if (rtd->dai_link->params) {
2777                 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2778                          rtd->dai_link->stream_name);
2779
2780                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2781                                            playback, capture, &pcm);
2782         } else if (rtd->dai_link->no_pcm) {
2783                 snprintf(new_name, sizeof(new_name), "(%s)",
2784                         rtd->dai_link->stream_name);
2785
2786                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2787                                 playback, capture, &pcm);
2788         } else {
2789                 if (rtd->dai_link->dynamic)
2790                         snprintf(new_name, sizeof(new_name), "%s (*)",
2791                                 rtd->dai_link->stream_name);
2792                 else
2793                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2794                                 rtd->dai_link->stream_name,
2795                                 (rtd->num_codecs > 1) ?
2796                                 "multicodec" : asoc_rtd_to_codec(rtd, 0)->name, num);
2797
2798                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2799                         capture, &pcm);
2800         }
2801         if (ret < 0) {
2802                 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2803                         new_name, rtd->dai_link->name, ret);
2804                 return ret;
2805         }
2806         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2807
2808         /* DAPM dai link stream work */
2809         if (rtd->dai_link->params)
2810                 rtd->close_delayed_work_func = codec2codec_close_delayed_work;
2811         else
2812                 rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2813
2814         pcm->nonatomic = rtd->dai_link->nonatomic;
2815         rtd->pcm = pcm;
2816         pcm->private_data = rtd;
2817
2818         if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
2819                 if (playback)
2820                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2821                 if (capture)
2822                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2823                 goto out;
2824         }
2825
2826         /* ASoC PCM operations */
2827         if (rtd->dai_link->dynamic) {
2828                 rtd->ops.open           = dpcm_fe_dai_open;
2829                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2830                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2831                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2832                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2833                 rtd->ops.close          = dpcm_fe_dai_close;
2834                 rtd->ops.pointer        = soc_pcm_pointer;
2835         } else {
2836                 rtd->ops.open           = soc_pcm_open;
2837                 rtd->ops.hw_params      = soc_pcm_hw_params;
2838                 rtd->ops.prepare        = soc_pcm_prepare;
2839                 rtd->ops.trigger        = soc_pcm_trigger;
2840                 rtd->ops.hw_free        = soc_pcm_hw_free;
2841                 rtd->ops.close          = soc_pcm_close;
2842                 rtd->ops.pointer        = soc_pcm_pointer;
2843         }
2844
2845         for_each_rtd_components(rtd, i, component) {
2846                 const struct snd_soc_component_driver *drv = component->driver;
2847
2848                 if (drv->ioctl)
2849                         rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2850                 if (drv->sync_stop)
2851                         rtd->ops.sync_stop      = snd_soc_pcm_component_sync_stop;
2852                 if (drv->copy_user)
2853                         rtd->ops.copy_user      = snd_soc_pcm_component_copy_user;
2854                 if (drv->page)
2855                         rtd->ops.page           = snd_soc_pcm_component_page;
2856                 if (drv->mmap)
2857                         rtd->ops.mmap           = snd_soc_pcm_component_mmap;
2858         }
2859
2860         if (playback)
2861                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2862
2863         if (capture)
2864                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2865
2866         ret = snd_soc_pcm_component_new(rtd);
2867         if (ret < 0) {
2868                 dev_err(rtd->dev, "ASoC: pcm %s constructor failed for dailink %s: %d\n",
2869                         new_name, rtd->dai_link->name, ret);
2870                 return ret;
2871         }
2872
2873         pcm->no_device_suspend = true;
2874 out:
2875         dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
2876                 (rtd->num_codecs > 1) ? "multicodec" : asoc_rtd_to_codec(rtd, 0)->name,
2877                 (rtd->num_cpus > 1)   ? "multicpu"   : asoc_rtd_to_cpu(rtd, 0)->name);
2878         return ret;
2879 }
2880
2881 /* is the current PCM operation for this FE ? */
2882 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2883 {
2884         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2885                 return 1;
2886         return 0;
2887 }
2888 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2889
2890 /* is the current PCM operation for this BE ? */
2891 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2892                 struct snd_soc_pcm_runtime *be, int stream)
2893 {
2894         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2895            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2896                   be->dpcm[stream].runtime_update))
2897                 return 1;
2898         return 0;
2899 }
2900 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2901
2902 /* get the substream for this BE */
2903 struct snd_pcm_substream *
2904         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2905 {
2906         return be->pcm->streams[stream].substream;
2907 }
2908 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2909
2910 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
2911                                     struct snd_soc_pcm_runtime *be,
2912                                     int stream,
2913                                     const enum snd_soc_dpcm_state *states,
2914                                     int num_states)
2915 {
2916         struct snd_soc_dpcm *dpcm;
2917         int state;
2918         int ret = 1;
2919         unsigned long flags;
2920         int i;
2921
2922         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
2923         for_each_dpcm_fe(be, stream, dpcm) {
2924
2925                 if (dpcm->fe == fe)
2926                         continue;
2927
2928                 state = dpcm->fe->dpcm[stream].state;
2929                 for (i = 0; i < num_states; i++) {
2930                         if (state == states[i]) {
2931                                 ret = 0;
2932                                 break;
2933                         }
2934                 }
2935         }
2936         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
2937
2938         /* it's safe to do this BE DAI */
2939         return ret;
2940 }
2941
2942 /*
2943  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2944  * are not running, paused or suspended for the specified stream direction.
2945  */
2946 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2947                 struct snd_soc_pcm_runtime *be, int stream)
2948 {
2949         const enum snd_soc_dpcm_state state[] = {
2950                 SND_SOC_DPCM_STATE_START,
2951                 SND_SOC_DPCM_STATE_PAUSED,
2952                 SND_SOC_DPCM_STATE_SUSPEND,
2953         };
2954
2955         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
2956 }
2957 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2958
2959 /*
2960  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2961  * running, paused or suspended for the specified stream direction.
2962  */
2963 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2964                 struct snd_soc_pcm_runtime *be, int stream)
2965 {
2966         const enum snd_soc_dpcm_state state[] = {
2967                 SND_SOC_DPCM_STATE_START,
2968                 SND_SOC_DPCM_STATE_PAUSED,
2969                 SND_SOC_DPCM_STATE_SUSPEND,
2970                 SND_SOC_DPCM_STATE_PREPARE,
2971         };
2972
2973         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
2974 }
2975 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);