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
 728         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 729         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 730                 goto dynamic;
 731
 732         /* Check that the codec and cpu DAIs are compatible */
 733         soc_pcm_init_runtime_hw(substream);
 734
 735         if (rtd->num_codecs == 1)
 736                 codec_dai_name = asoc_rtd_to_codec(rtd, 0)->name;
 737
 738         if (rtd->num_cpus == 1)
 739                 cpu_dai_name = asoc_rtd_to_cpu(rtd, 0)->name;
 740
 741         if (soc_pcm_has_symmetry(substream))
 742                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 743
 744         ret = -EINVAL;
 745         if (!runtime->hw.rates) {
 746                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 747                         codec_dai_name, cpu_dai_name);
 748                 goto err;
 749         }
 750         if (!runtime->hw.formats) {
 751                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 752                         codec_dai_name, cpu_dai_name);
 753                 goto err;
 754         }
 755         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 756             runtime->hw.channels_min > runtime->hw.channels_max) {
 757                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 758                                 codec_dai_name, cpu_dai_name);
 759                 goto err;
 760         }
 761
 762         soc_pcm_apply_msb(substream);
 763
 764         /* Symmetry only applies if we've already got an active stream. */
 765         for_each_rtd_dais(rtd, i, dai) {
 766                 if (snd_soc_dai_active(dai)) {
 767                         ret = soc_pcm_apply_symmetry(substream, dai);
 768                         if (ret != 0)
 769                                 goto err;
 770                 }
 771         }
 772
 773         pr_debug("ASoC: %s <-> %s info:\n",
 774                  codec_dai_name, cpu_dai_name);
 775         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 776         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 777                  runtime->hw.channels_max);
 778         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 779                  runtime->hw.rate_max);
 780 dynamic:
 781         snd_soc_runtime_activate(rtd, substream->stream);
 782         ret = 0;
 783 err:
 784         mutex_unlock(&rtd->card->pcm_mutex);
 785 pm_err:
 786         if (ret < 0)
 787                 soc_pcm_clean(substream, 1);
 788
 789         return ret;
 790 }
 791
 792 static void codec2codec_close_delayed_work(struct snd_soc_pcm_runtime *rtd)
 793 {
 794         /*
 795          * Currently nothing to do for c2c links
 796          * Since c2c links are internal nodes in the DAPM graph and
 797          * don't interface with the outside world or application layer
 798          * we don't have to do any special handling on close.
 799          */
 800 }
 801
 802 /*
 803  * Called by ALSA when the PCM substream is prepared, can set format, sample
 804  * rate, etc.  This function is non atomic and can be called multiple times,
 805  * it can refer to the runtime info.
 806  */
 807 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 808 {
 809         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 810         struct snd_soc_dai *dai;
 811         int i, ret = 0;
 812
 813         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 814
 815         ret = snd_soc_link_prepare(substream);
 816         if (ret < 0)
 817                 goto out;
 818
 819         ret = snd_soc_pcm_component_prepare(substream);
 820         if (ret < 0)
 821                 goto out;
 822
 823         ret = snd_soc_pcm_dai_prepare(substream);
 824         if (ret < 0) {
 825                 dev_err(rtd->dev, "ASoC: DAI prepare error: %d\n", ret);
 826                 goto out;
 827         }
 828
 829         /* cancel any delayed stream shutdown that is pending */
 830         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 831             rtd->pop_wait) {
 832                 rtd->pop_wait = 0;
 833                 cancel_delayed_work(&rtd->delayed_work);
 834         }
 835
 836         snd_soc_dapm_stream_event(rtd, substream->stream,
 837                         SND_SOC_DAPM_STREAM_START);
 838
 839         for_each_rtd_dais(rtd, i, dai)
 840                 snd_soc_dai_digital_mute(dai, 0, substream->stream);
 841
 842 out:
 843         mutex_unlock(&rtd->card->pcm_mutex);
 844         return ret;
 845 }
 846
 847 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 848                                        unsigned int mask)
 849 {
 850         struct snd_interval *interval;
 851         int channels = hweight_long(mask);
 852
 853         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 854         interval->min = channels;
 855         interval->max = channels;
 856 }
 857
 858 /*
 859  * Called by ALSA when the hardware params are set by application. This
 860  * function can also be called multiple times and can allocate buffers
 861  * (using snd_pcm_lib_* ). It's non-atomic.
 862  */
 863 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 864                                 struct snd_pcm_hw_params *params)
 865 {
 866         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 867         struct snd_soc_component *component;
 868         struct snd_soc_dai *cpu_dai;
 869         struct snd_soc_dai *codec_dai;
 870         int i, ret = 0;
 871
 872         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 873
 874         ret = soc_pcm_params_symmetry(substream, params);
 875         if (ret)
 876                 goto out;
 877
 878         ret = snd_soc_link_hw_params(substream, params);
 879         if (ret < 0)
 880                 goto out;
 881
 882         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 883                 struct snd_pcm_hw_params codec_params;
 884
 885                 /*
 886                  * Skip CODECs which don't support the current stream type,
 887                  * the idea being that if a CODEC is not used for the currently
 888                  * set up transfer direction, it should not need to be
 889                  * configured, especially since the configuration used might
 890                  * not even be supported by that CODEC. There may be cases
 891                  * however where a CODEC needs to be set up although it is
 892                  * actually not being used for the transfer, e.g. if a
 893                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
 894                  * for the DAI link including a playback-only CODEC.
 895                  * If this becomes necessary, we will have to augment the
 896                  * machine driver setup with information on how to act, so
 897                  * we can do the right thing here.
 898                  */
 899                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 900                         continue;
 901
 902                 /* copy params for each codec */
 903                 codec_params = *params;
 904
 905                 /* fixup params based on TDM slot masks */
 906                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 907                     codec_dai->tx_mask)
 908                         soc_pcm_codec_params_fixup(&codec_params,
 909                                                    codec_dai->tx_mask);
 910
 911                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
 912                     codec_dai->rx_mask)
 913                         soc_pcm_codec_params_fixup(&codec_params,
 914                                                    codec_dai->rx_mask);
 915
 916                 ret = snd_soc_dai_hw_params(codec_dai, substream,
 917                                             &codec_params);
 918                 if(ret < 0)
 919                         goto codec_err;
 920
 921                 codec_dai->rate = params_rate(&codec_params);
 922                 codec_dai->channels = params_channels(&codec_params);
 923                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 924                                                 params_format(&codec_params));
 925
 926                 snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
 927         }
 928
 929         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 930                 /*
 931                  * Skip CPUs which don't support the current stream
 932                  * type. See soc_pcm_init_runtime_hw() for more details
 933                  */
 934                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
 935                         continue;
 936
 937                 ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
 938                 if (ret < 0)
 939                         goto interface_err;
 940
 941                 /* store the parameters for each DAI */
 942                 cpu_dai->rate = params_rate(params);
 943                 cpu_dai->channels = params_channels(params);
 944                 cpu_dai->sample_bits =
 945                         snd_pcm_format_physical_width(params_format(params));
 946
 947                 snd_soc_dapm_update_dai(substream, params, cpu_dai);
 948         }
 949
 950         ret = snd_soc_pcm_component_hw_params(substream, params, &component);
 951         if (ret < 0)
 952                 goto component_err;
 953
 954 out:
 955         mutex_unlock(&rtd->card->pcm_mutex);
 956         return ret;
 957
 958 component_err:
 959         snd_soc_pcm_component_hw_free(substream, component);
 960
 961         i = rtd->num_cpus;
 962
 963 interface_err:
 964         for_each_rtd_cpu_dais_rollback(rtd, i, cpu_dai) {
 965                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
 966                         continue;
 967
 968                 snd_soc_dai_hw_free(cpu_dai, substream);
 969                 cpu_dai->rate = 0;
 970         }
 971
 972         i = rtd->num_codecs;
 973
 974 codec_err:
 975         for_each_rtd_codec_dais_rollback(rtd, i, codec_dai) {
 976                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 977                         continue;
 978
 979                 snd_soc_dai_hw_free(codec_dai, substream);
 980                 codec_dai->rate = 0;
 981         }
 982
 983         snd_soc_link_hw_free(substream);
 984
 985         mutex_unlock(&rtd->card->pcm_mutex);
 986         return ret;
 987 }
 988
 989 /*
 990  * Frees resources allocated by hw_params, can be called multiple times
 991  */
 992 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 993 {
 994         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 995         struct snd_soc_dai *dai;
 996         int i;
 997
 998         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 999
1000         /* clear the corresponding DAIs parameters when going to be inactive */
1001         for_each_rtd_dais(rtd, i, dai) {
1002                 int active = snd_soc_dai_stream_active(dai, substream->stream);
1003
1004                 if (snd_soc_dai_active(dai) == 1) {
1005                         dai->rate = 0;
1006                         dai->channels = 0;
1007                         dai->sample_bits = 0;
1008                 }
1009
1010                 if (active == 1)
1011                         snd_soc_dai_digital_mute(dai, 1, substream->stream);
1012         }
1013
1014         /* free any machine hw params */
1015         snd_soc_link_hw_free(substream);
1016
1017         /* free any component resources */
1018         snd_soc_pcm_component_hw_free(substream, NULL);
1019
1020         /* now free hw params for the DAIs  */
1021         for_each_rtd_dais(rtd, i, dai) {
1022                 if (!snd_soc_dai_stream_valid(dai, substream->stream))
1023                         continue;
1024
1025                 snd_soc_dai_hw_free(dai, substream);
1026         }
1027
1028         mutex_unlock(&rtd->card->pcm_mutex);
1029         return 0;
1030 }
1031
1032 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1033 {
1034         int ret = -EINVAL;
1035
1036         switch (cmd) {
1037         case SNDRV_PCM_TRIGGER_START:
1038         case SNDRV_PCM_TRIGGER_RESUME:
1039         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1040                 ret = snd_soc_link_trigger(substream, cmd);
1041                 if (ret < 0)
1042                         break;
1043
1044                 ret = snd_soc_pcm_component_trigger(substream, cmd);
1045                 if (ret < 0)
1046                         break;
1047
1048                 ret = snd_soc_pcm_dai_trigger(substream, cmd);
1049                 break;
1050         case SNDRV_PCM_TRIGGER_STOP:
1051         case SNDRV_PCM_TRIGGER_SUSPEND:
1052         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1053                 ret = snd_soc_pcm_dai_trigger(substream, cmd);
1054                 if (ret < 0)
1055                         break;
1056
1057                 ret = snd_soc_pcm_component_trigger(substream, cmd);
1058                 if (ret < 0)
1059                         break;
1060
1061                 ret = snd_soc_link_trigger(substream, cmd);
1062                 break;
1063         }
1064
1065         return ret;
1066 }
1067
1068 /*
1069  * soc level wrapper for pointer callback
1070  * If cpu_dai, codec_dai, component driver has the delay callback, then
1071  * the runtime->delay will be updated accordingly.
1072  */
1073 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1074 {
1075         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1076         struct snd_soc_dai *cpu_dai;
1077         struct snd_soc_dai *codec_dai;
1078         struct snd_pcm_runtime *runtime = substream->runtime;
1079         snd_pcm_uframes_t offset = 0;
1080         snd_pcm_sframes_t delay = 0;
1081         snd_pcm_sframes_t codec_delay = 0;
1082         snd_pcm_sframes_t cpu_delay = 0;
1083         int i;
1084
1085         /* clearing the previous total delay */
1086         runtime->delay = 0;
1087
1088         offset = snd_soc_pcm_component_pointer(substream);
1089
1090         /* base delay if assigned in pointer callback */
1091         delay = runtime->delay;
1092
1093         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1094                 cpu_delay = max(cpu_delay,
1095                                 snd_soc_dai_delay(cpu_dai, substream));
1096         }
1097         delay += cpu_delay;
1098
1099         for_each_rtd_codec_dais(rtd, i, codec_dai) {
1100                 codec_delay = max(codec_delay,
1101                                   snd_soc_dai_delay(codec_dai, substream));
1102         }
1103         delay += codec_delay;
1104
1105         runtime->delay = delay;
1106
1107         return offset;
1108 }
1109
1110 /* connect a FE and BE */
1111 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1112                 struct snd_soc_pcm_runtime *be, int stream)
1113 {
1114         struct snd_soc_dpcm *dpcm;
1115         unsigned long flags;
1116
1117         /* only add new dpcms */
1118         for_each_dpcm_be(fe, stream, dpcm) {
1119                 if (dpcm->be == be && dpcm->fe == fe)
1120                         return 0;
1121         }
1122
1123         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1124         if (!dpcm)
1125                 return -ENOMEM;
1126
1127         dpcm->be = be;
1128         dpcm->fe = fe;
1129         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1130         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1131         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1132         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1133         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1134         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1135
1136         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1137                         stream ? "capture" : "playback",  fe->dai_link->name,
1138                         stream ? "<-" : "->", be->dai_link->name);
1139
1140         dpcm_create_debugfs_state(dpcm, stream);
1141
1142         return 1;
1143 }
1144
1145 /* reparent a BE onto another FE */
1146 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1147                         struct snd_soc_pcm_runtime *be, int stream)
1148 {
1149         struct snd_soc_dpcm *dpcm;
1150         struct snd_pcm_substream *fe_substream, *be_substream;
1151
1152         /* reparent if BE is connected to other FEs */
1153         if (!be->dpcm[stream].users)
1154                 return;
1155
1156         be_substream = snd_soc_dpcm_get_substream(be, stream);
1157         if (!be_substream)
1158                 return;
1159
1160         for_each_dpcm_fe(be, stream, dpcm) {
1161                 if (dpcm->fe == fe)
1162                         continue;
1163
1164                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1165                         stream ? "capture" : "playback",
1166                         dpcm->fe->dai_link->name,
1167                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1168
1169                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1170                 be_substream->runtime = fe_substream->runtime;
1171                 break;
1172         }
1173 }
1174
1175 /* disconnect a BE and FE */
1176 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1177 {
1178         struct snd_soc_dpcm *dpcm, *d;
1179         unsigned long flags;
1180
1181         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1182                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1183                                 stream ? "capture" : "playback",
1184                                 dpcm->be->dai_link->name);
1185
1186                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1187                         continue;
1188
1189                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1190                         stream ? "capture" : "playback", fe->dai_link->name,
1191                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1192
1193                 /* BEs still alive need new FE */
1194                 dpcm_be_reparent(fe, dpcm->be, stream);
1195
1196                 dpcm_remove_debugfs_state(dpcm);
1197
1198                 spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1199                 list_del(&dpcm->list_be);
1200                 list_del(&dpcm->list_fe);
1201                 spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1202                 kfree(dpcm);
1203         }
1204 }
1205
1206 /* get BE for DAI widget and stream */
1207 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1208                 struct snd_soc_dapm_widget *widget, int stream)
1209 {
1210         struct snd_soc_pcm_runtime *be;
1211         struct snd_soc_dapm_widget *w;
1212         struct snd_soc_dai *dai;
1213         int i;
1214
1215         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1216
1217         for_each_card_rtds(card, be) {
1218
1219                 if (!be->dai_link->no_pcm)
1220                         continue;
1221
1222                 for_each_rtd_dais(be, i, dai) {
1223                         w = snd_soc_dai_get_widget(dai, stream);
1224
1225                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1226                                 w ? w->name : "(not set)");
1227
1228                         if (w == widget)
1229                                 return be;
1230                 }
1231         }
1232
1233         /* Widget provided is not a BE */
1234         return NULL;
1235 }
1236
1237 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1238                 struct snd_soc_dapm_widget *widget)
1239 {
1240         struct snd_soc_dapm_widget *w;
1241         int i;
1242
1243         for_each_dapm_widgets(list, i, w)
1244                 if (widget == w)
1245                         return 1;
1246
1247         return 0;
1248 }
1249
1250 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1251                 enum snd_soc_dapm_direction dir)
1252 {
1253         struct snd_soc_card *card = widget->dapm->card;
1254         struct snd_soc_pcm_runtime *rtd;
1255         int stream;
1256
1257         /* adjust dir to stream */
1258         if (dir == SND_SOC_DAPM_DIR_OUT)
1259                 stream = SNDRV_PCM_STREAM_PLAYBACK;
1260         else
1261                 stream = SNDRV_PCM_STREAM_CAPTURE;
1262
1263         rtd = dpcm_get_be(card, widget, stream);
1264         if (rtd)
1265                 return true;
1266
1267         return false;
1268 }
1269
1270 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1271         int stream, struct snd_soc_dapm_widget_list **list)
1272 {
1273         struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
1274         int paths;
1275
1276         if (fe->num_cpus > 1) {
1277                 dev_err(fe->dev,
1278                         "%s doesn't support Multi CPU yet\n", __func__);
1279                 return -EINVAL;
1280         }
1281
1282         /* get number of valid DAI paths and their widgets */
1283         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1284                         dpcm_end_walk_at_be);
1285
1286         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1287                         stream ? "capture" : "playback");
1288
1289         return paths;
1290 }
1291
1292 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1293 {
1294         snd_soc_dapm_dai_free_widgets(list);
1295 }
1296
1297 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1298                               struct snd_soc_dapm_widget_list *list)
1299 {
1300         struct snd_soc_dapm_widget *widget;
1301         struct snd_soc_dai *dai;
1302         unsigned int i;
1303
1304         /* is there a valid DAI widget for this BE */
1305         for_each_rtd_dais(dpcm->be, i, dai) {
1306                 widget = snd_soc_dai_get_widget(dai, stream);
1307
1308                 /*
1309                  * The BE is pruned only if none of the dai
1310                  * widgets are in the active list.
1311                  */
1312                 if (widget && widget_in_list(list, widget))
1313                         return true;
1314         }
1315
1316         return false;
1317 }
1318
1319 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1320                             struct snd_soc_dapm_widget_list **list_)
1321 {
1322         struct snd_soc_dpcm *dpcm;
1323         int prune = 0;
1324
1325         /* Destroy any old FE <--> BE connections */
1326         for_each_dpcm_be(fe, stream, dpcm) {
1327                 if (dpcm_be_is_active(dpcm, stream, *list_))
1328                         continue;
1329
1330                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1331                         stream ? "capture" : "playback",
1332                         dpcm->be->dai_link->name, fe->dai_link->name);
1333                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1334                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1335                 prune++;
1336         }
1337
1338         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1339         return prune;
1340 }
1341
1342 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1343         struct snd_soc_dapm_widget_list **list_)
1344 {
1345         struct snd_soc_card *card = fe->card;
1346         struct snd_soc_dapm_widget_list *list = *list_;
1347         struct snd_soc_pcm_runtime *be;
1348         struct snd_soc_dapm_widget *widget;
1349         int i, new = 0, err;
1350
1351         /* Create any new FE <--> BE connections */
1352         for_each_dapm_widgets(list, i, widget) {
1353
1354                 switch (widget->id) {
1355                 case snd_soc_dapm_dai_in:
1356                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1357                                 continue;
1358                         break;
1359                 case snd_soc_dapm_dai_out:
1360                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1361                                 continue;
1362                         break;
1363                 default:
1364                         continue;
1365                 }
1366
1367                 /* is there a valid BE rtd for this widget */
1368                 be = dpcm_get_be(card, widget, stream);
1369                 if (!be) {
1370                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1371                                         widget->name);
1372                         continue;
1373                 }
1374
1375                 /* don't connect if FE is not running */
1376                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1377                         continue;
1378
1379                 /* newly connected FE and BE */
1380                 err = dpcm_be_connect(fe, be, stream);
1381                 if (err < 0) {
1382                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1383                                 widget->name);
1384                         break;
1385                 } else if (err == 0) /* already connected */
1386                         continue;
1387
1388                 /* new */
1389                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1390                 new++;
1391         }
1392
1393         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1394         return new;
1395 }
1396
1397 /*
1398  * Find the corresponding BE DAIs that source or sink audio to this
1399  * FE substream.
1400  */
1401 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1402         int stream, struct snd_soc_dapm_widget_list **list, int new)
1403 {
1404         if (new)
1405                 return dpcm_add_paths(fe, stream, list);
1406         else
1407                 return dpcm_prune_paths(fe, stream, list);
1408 }
1409
1410 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1411 {
1412         struct snd_soc_dpcm *dpcm;
1413         unsigned long flags;
1414
1415         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1416         for_each_dpcm_be(fe, stream, dpcm)
1417                 dpcm->be->dpcm[stream].runtime_update =
1418                                                 SND_SOC_DPCM_UPDATE_NO;
1419         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1420 }
1421
1422 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1423         int stream)
1424 {
1425         struct snd_soc_dpcm *dpcm;
1426
1427         /* disable any enabled and non active backends */
1428         for_each_dpcm_be(fe, stream, dpcm) {
1429
1430                 struct snd_soc_pcm_runtime *be = dpcm->be;
1431                 struct snd_pcm_substream *be_substream =
1432                         snd_soc_dpcm_get_substream(be, stream);
1433
1434                 if (be->dpcm[stream].users == 0)
1435                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1436                                 stream ? "capture" : "playback",
1437                                 be->dpcm[stream].state);
1438
1439                 if (--be->dpcm[stream].users != 0)
1440                         continue;
1441
1442                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1443                         continue;
1444
1445                 soc_pcm_close(be_substream);
1446                 be_substream->runtime = NULL;
1447                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1448         }
1449 }
1450
1451 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1452 {
1453         struct snd_soc_dpcm *dpcm;
1454         int err, count = 0;
1455
1456         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1457         for_each_dpcm_be(fe, stream, dpcm) {
1458
1459                 struct snd_soc_pcm_runtime *be = dpcm->be;
1460                 struct snd_pcm_substream *be_substream =
1461                         snd_soc_dpcm_get_substream(be, stream);
1462
1463                 if (!be_substream) {
1464                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1465                                 stream ? "capture" : "playback");
1466                         continue;
1467                 }
1468
1469                 /* is this op for this BE ? */
1470                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1471                         continue;
1472
1473                 /* first time the dpcm is open ? */
1474                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1475                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1476                                 stream ? "capture" : "playback",
1477                                 be->dpcm[stream].state);
1478
1479                 if (be->dpcm[stream].users++ != 0)
1480                         continue;
1481
1482                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1483                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1484                         continue;
1485
1486                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1487                         stream ? "capture" : "playback", be->dai_link->name);
1488
1489                 be_substream->runtime = be->dpcm[stream].runtime;
1490                 err = soc_pcm_open(be_substream);
1491                 if (err < 0) {
1492                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1493                         be->dpcm[stream].users--;
1494                         if (be->dpcm[stream].users < 0)
1495                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1496                                         stream ? "capture" : "playback",
1497                                         be->dpcm[stream].state);
1498
1499                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1500                         goto unwind;
1501                 }
1502
1503                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1504                 count++;
1505         }
1506
1507         return count;
1508
1509 unwind:
1510         /* disable any enabled and non active backends */
1511         for_each_dpcm_be_rollback(fe, stream, dpcm) {
1512                 struct snd_soc_pcm_runtime *be = dpcm->be;
1513                 struct snd_pcm_substream *be_substream =
1514                         snd_soc_dpcm_get_substream(be, stream);
1515
1516                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1517                         continue;
1518
1519                 if (be->dpcm[stream].users == 0)
1520                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1521                                 stream ? "capture" : "playback",
1522                                 be->dpcm[stream].state);
1523
1524                 if (--be->dpcm[stream].users != 0)
1525                         continue;
1526
1527                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1528                         continue;
1529
1530                 soc_pcm_close(be_substream);
1531                 be_substream->runtime = NULL;
1532                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1533         }
1534
1535         return err;
1536 }
1537
1538 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1539                                  struct snd_soc_pcm_stream *stream)
1540 {
1541         runtime->hw.rate_min = stream->rate_min;
1542         runtime->hw.rate_max = min_not_zero(stream->rate_max, UINT_MAX);
1543         runtime->hw.channels_min = stream->channels_min;
1544         runtime->hw.channels_max = stream->channels_max;
1545         if (runtime->hw.formats)
1546                 runtime->hw.formats &= stream->formats;
1547         else
1548                 runtime->hw.formats = stream->formats;
1549         runtime->hw.rates = stream->rates;
1550 }
1551
1552 static void dpcm_runtime_merge_format(struct snd_pcm_substream *substream,
1553                                       u64 *formats)
1554 {
1555         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1556         struct snd_soc_dpcm *dpcm;
1557         struct snd_soc_dai *dai;
1558         int stream = substream->stream;
1559
1560         if (!fe->dai_link->dpcm_merged_format)
1561                 return;
1562
1563         /*
1564          * It returns merged BE codec format
1565          * if FE want to use it (= dpcm_merged_format)
1566          */
1567
1568         for_each_dpcm_be(fe, stream, dpcm) {
1569                 struct snd_soc_pcm_runtime *be = dpcm->be;
1570                 struct snd_soc_pcm_stream *codec_stream;
1571                 int i;
1572
1573                 for_each_rtd_codec_dais(be, i, dai) {
1574                         /*
1575                          * Skip CODECs which don't support the current stream
1576                          * type. See soc_pcm_init_runtime_hw() for more details
1577                          */
1578                         if (!snd_soc_dai_stream_valid(dai, stream))
1579                                 continue;
1580
1581                         codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1582
1583                         *formats &= codec_stream->formats;
1584                 }
1585         }
1586 }
1587
1588 static void dpcm_runtime_merge_chan(struct snd_pcm_substream *substream,
1589                                     unsigned int *channels_min,
1590                                     unsigned int *channels_max)
1591 {
1592         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1593         struct snd_soc_dpcm *dpcm;
1594         int stream = substream->stream;
1595
1596         if (!fe->dai_link->dpcm_merged_chan)
1597                 return;
1598
1599         /*
1600          * It returns merged BE codec channel;
1601          * if FE want to use it (= dpcm_merged_chan)
1602          */
1603
1604         for_each_dpcm_be(fe, stream, dpcm) {
1605                 struct snd_soc_pcm_runtime *be = dpcm->be;
1606                 struct snd_soc_pcm_stream *codec_stream;
1607                 struct snd_soc_pcm_stream *cpu_stream;
1608                 struct snd_soc_dai *dai;
1609                 int i;
1610
1611                 for_each_rtd_cpu_dais(be, i, dai) {
1612                         /*
1613                          * Skip CPUs which don't support the current stream
1614                          * type. See soc_pcm_init_runtime_hw() for more details
1615                          */
1616                         if (!snd_soc_dai_stream_valid(dai, stream))
1617                                 continue;
1618
1619                         cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1620
1621                         *channels_min = max(*channels_min,
1622                                             cpu_stream->channels_min);
1623                         *channels_max = min(*channels_max,
1624                                             cpu_stream->channels_max);
1625                 }
1626
1627                 /*
1628                  * chan min/max cannot be enforced if there are multiple CODEC
1629                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1630                  */
1631                 if (be->num_codecs == 1) {
1632                         codec_stream = snd_soc_dai_get_pcm_stream(asoc_rtd_to_codec(be, 0), stream);
1633
1634                         *channels_min = max(*channels_min,
1635                                             codec_stream->channels_min);
1636                         *channels_max = min(*channels_max,
1637                                             codec_stream->channels_max);
1638                 }
1639         }
1640 }
1641
1642 static void dpcm_runtime_merge_rate(struct snd_pcm_substream *substream,
1643                                     unsigned int *rates,
1644                                     unsigned int *rate_min,
1645                                     unsigned int *rate_max)
1646 {
1647         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1648         struct snd_soc_dpcm *dpcm;
1649         int stream = substream->stream;
1650
1651         if (!fe->dai_link->dpcm_merged_rate)
1652                 return;
1653
1654         /*
1655          * It returns merged BE codec channel;
1656          * if FE want to use it (= dpcm_merged_chan)
1657          */
1658
1659         for_each_dpcm_be(fe, stream, dpcm) {
1660                 struct snd_soc_pcm_runtime *be = dpcm->be;
1661                 struct snd_soc_pcm_stream *pcm;
1662                 struct snd_soc_dai *dai;
1663                 int i;
1664
1665                 for_each_rtd_dais(be, i, dai) {
1666                         /*
1667                          * Skip DAIs which don't support the current stream
1668                          * type. See soc_pcm_init_runtime_hw() for more details
1669                          */
1670                         if (!snd_soc_dai_stream_valid(dai, stream))
1671                                 continue;
1672
1673                         pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1674
1675                         *rate_min = max(*rate_min, pcm->rate_min);
1676                         *rate_max = min_not_zero(*rate_max, pcm->rate_max);
1677                         *rates = snd_pcm_rate_mask_intersect(*rates, pcm->rates);
1678                 }
1679         }
1680 }
1681
1682 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1683 {
1684         struct snd_pcm_runtime *runtime = substream->runtime;
1685         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1686         struct snd_soc_dai *cpu_dai;
1687         int i;
1688
1689         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1690                 /*
1691                  * Skip CPUs which don't support the current stream
1692                  * type. See soc_pcm_init_runtime_hw() for more details
1693                  */
1694                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1695                         continue;
1696
1697                 dpcm_init_runtime_hw(runtime,
1698                         snd_soc_dai_get_pcm_stream(cpu_dai,
1699                                                    substream->stream));
1700         }
1701
1702         dpcm_runtime_merge_format(substream, &runtime->hw.formats);
1703         dpcm_runtime_merge_chan(substream, &runtime->hw.channels_min,
1704                                 &runtime->hw.channels_max);
1705         dpcm_runtime_merge_rate(substream, &runtime->hw.rates,
1706                                 &runtime->hw.rate_min, &runtime->hw.rate_max);
1707 }
1708
1709 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1710
1711 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1712  * for avoiding the race with trigger callback.
1713  * If the state is unset and a trigger is pending while the previous operation,
1714  * process the pending trigger action here.
1715  */
1716 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1717                                      int stream, enum snd_soc_dpcm_update state)
1718 {
1719         struct snd_pcm_substream *substream =
1720                 snd_soc_dpcm_get_substream(fe, stream);
1721
1722         snd_pcm_stream_lock_irq(substream);
1723         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1724                 dpcm_fe_dai_do_trigger(substream,
1725                                        fe->dpcm[stream].trigger_pending - 1);
1726                 fe->dpcm[stream].trigger_pending = 0;
1727         }
1728         fe->dpcm[stream].runtime_update = state;
1729         snd_pcm_stream_unlock_irq(substream);
1730 }
1731
1732 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1733                                int stream)
1734 {
1735         struct snd_soc_dpcm *dpcm;
1736         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1737         struct snd_soc_dai *fe_cpu_dai;
1738         int err = 0;
1739         int i;
1740
1741         /* apply symmetry for FE */
1742         if (soc_pcm_has_symmetry(fe_substream))
1743                 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1744
1745         for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1746                 /* Symmetry only applies if we've got an active stream. */
1747                 if (snd_soc_dai_active(fe_cpu_dai)) {
1748                         err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1749                         if (err < 0)
1750                                 return err;
1751                 }
1752         }
1753
1754         /* apply symmetry for BE */
1755         for_each_dpcm_be(fe, stream, dpcm) {
1756                 struct snd_soc_pcm_runtime *be = dpcm->be;
1757                 struct snd_pcm_substream *be_substream =
1758                         snd_soc_dpcm_get_substream(be, stream);
1759                 struct snd_soc_pcm_runtime *rtd;
1760                 struct snd_soc_dai *dai;
1761                 int i;
1762
1763                 /* A backend may not have the requested substream */
1764                 if (!be_substream)
1765                         continue;
1766
1767                 rtd = asoc_substream_to_rtd(be_substream);
1768                 if (rtd->dai_link->be_hw_params_fixup)
1769                         continue;
1770
1771                 if (soc_pcm_has_symmetry(be_substream))
1772                         be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1773
1774                 /* Symmetry only applies if we've got an active stream. */
1775                 for_each_rtd_dais(rtd, i, dai) {
1776                         if (snd_soc_dai_active(dai)) {
1777                                 err = soc_pcm_apply_symmetry(fe_substream, dai);
1778                                 if (err < 0)
1779                                         return err;
1780                         }
1781                 }
1782         }
1783
1784         return 0;
1785 }
1786
1787 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1788 {
1789         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1790         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1791         int stream = fe_substream->stream, ret = 0;
1792
1793         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1794
1795         ret = dpcm_be_dai_startup(fe, stream);
1796         if (ret < 0) {
1797                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1798                 goto be_err;
1799         }
1800
1801         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1802
1803         /* start the DAI frontend */
1804         ret = soc_pcm_open(fe_substream);
1805         if (ret < 0) {
1806                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1807                 goto unwind;
1808         }
1809
1810         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1811
1812         dpcm_set_fe_runtime(fe_substream);
1813         snd_pcm_limit_hw_rates(runtime);
1814
1815         ret = dpcm_apply_symmetry(fe_substream, stream);
1816         if (ret < 0)
1817                 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1818                         ret);
1819
1820 unwind:
1821         if (ret < 0)
1822                 dpcm_be_dai_startup_unwind(fe, stream);
1823 be_err:
1824         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1825         return ret;
1826 }
1827
1828 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1829 {
1830         struct snd_soc_dpcm *dpcm;
1831
1832         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1833         for_each_dpcm_be(fe, stream, dpcm) {
1834
1835                 struct snd_soc_pcm_runtime *be = dpcm->be;
1836                 struct snd_pcm_substream *be_substream =
1837                         snd_soc_dpcm_get_substream(be, stream);
1838
1839                 /* is this op for this BE ? */
1840                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1841                         continue;
1842
1843                 if (be->dpcm[stream].users == 0)
1844                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1845                                 stream ? "capture" : "playback",
1846                                 be->dpcm[stream].state);
1847
1848                 if (--be->dpcm[stream].users != 0)
1849                         continue;
1850
1851                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1852                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)) {
1853                         soc_pcm_hw_free(be_substream);
1854                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1855                 }
1856
1857                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1858                         be->dai_link->name);
1859
1860                 soc_pcm_close(be_substream);
1861                 be_substream->runtime = NULL;
1862
1863                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1864         }
1865         return 0;
1866 }
1867
1868 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1869 {
1870         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1871         int stream = substream->stream;
1872
1873         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1874
1875         /* shutdown the BEs */
1876         dpcm_be_dai_shutdown(fe, stream);
1877
1878         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1879
1880         /* now shutdown the frontend */
1881         soc_pcm_close(substream);
1882
1883         /* run the stream event for each BE */
1884         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1885
1886         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1887         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1888         return 0;
1889 }
1890
1891 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1892 {
1893         struct snd_soc_dpcm *dpcm;
1894
1895         /* only hw_params backends that are either sinks or sources
1896          * to this frontend DAI */
1897         for_each_dpcm_be(fe, stream, dpcm) {
1898
1899                 struct snd_soc_pcm_runtime *be = dpcm->be;
1900                 struct snd_pcm_substream *be_substream =
1901                         snd_soc_dpcm_get_substream(be, stream);
1902
1903                 /* is this op for this BE ? */
1904                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1905                         continue;
1906
1907                 /* only free hw when no longer used - check all FEs */
1908                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1909                                 continue;
1910
1911                 /* do not free hw if this BE is used by other FE */
1912                 if (be->dpcm[stream].users > 1)
1913                         continue;
1914
1915                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1916                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1917                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1918                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1919                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1920                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1921                         continue;
1922
1923                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1924                         be->dai_link->name);
1925
1926                 soc_pcm_hw_free(be_substream);
1927
1928                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1929         }
1930
1931         return 0;
1932 }
1933
1934 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1935 {
1936         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1937         int err, stream = substream->stream;
1938
1939         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1940         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1941
1942         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1943
1944         /* call hw_free on the frontend */
1945         err = soc_pcm_hw_free(substream);
1946         if (err < 0)
1947                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1948                         fe->dai_link->name);
1949
1950         /* only hw_params backends that are either sinks or sources
1951          * to this frontend DAI */
1952         err = dpcm_be_dai_hw_free(fe, stream);
1953
1954         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1955         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1956
1957         mutex_unlock(&fe->card->mutex);
1958         return 0;
1959 }
1960
1961 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1962 {
1963         struct snd_soc_dpcm *dpcm;
1964         int ret;
1965
1966         for_each_dpcm_be(fe, stream, dpcm) {
1967
1968                 struct snd_soc_pcm_runtime *be = dpcm->be;
1969                 struct snd_pcm_substream *be_substream =
1970                         snd_soc_dpcm_get_substream(be, stream);
1971
1972                 /* is this op for this BE ? */
1973                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1974                         continue;
1975
1976                 /* copy params for each dpcm */
1977                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1978                                 sizeof(struct snd_pcm_hw_params));
1979
1980                 /* perform any hw_params fixups */
1981                 ret = snd_soc_link_be_hw_params_fixup(be, &dpcm->hw_params);
1982                 if (ret < 0)
1983                         goto unwind;
1984
1985                 /* copy the fixed-up hw params for BE dai */
1986                 memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
1987                        sizeof(struct snd_pcm_hw_params));
1988
1989                 /* only allow hw_params() if no connected FEs are running */
1990                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1991                         continue;
1992
1993                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1994                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1995                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1996                         continue;
1997
1998                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1999                         be->dai_link->name);
2000
2001                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
2002                 if (ret < 0) {
2003                         dev_err(dpcm->be->dev,
2004                                 "ASoC: hw_params BE failed %d\n", ret);
2005                         goto unwind;
2006                 }
2007
2008                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2009         }
2010         return 0;
2011
2012 unwind:
2013         /* disable any enabled and non active backends */
2014         for_each_dpcm_be_rollback(fe, stream, dpcm) {
2015                 struct snd_soc_pcm_runtime *be = dpcm->be;
2016                 struct snd_pcm_substream *be_substream =
2017                         snd_soc_dpcm_get_substream(be, stream);
2018
2019                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2020                         continue;
2021
2022                 /* only allow hw_free() if no connected FEs are running */
2023                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2024                         continue;
2025
2026                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2027                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2028                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2029                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2030                         continue;
2031
2032                 soc_pcm_hw_free(be_substream);
2033         }
2034
2035         return ret;
2036 }
2037
2038 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2039                                  struct snd_pcm_hw_params *params)
2040 {
2041         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2042         int ret, stream = substream->stream;
2043
2044         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2045         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2046
2047         memcpy(&fe->dpcm[stream].hw_params, params,
2048                         sizeof(struct snd_pcm_hw_params));
2049         ret = dpcm_be_dai_hw_params(fe, stream);
2050         if (ret < 0) {
2051                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
2052                 goto out;
2053         }
2054
2055         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2056                         fe->dai_link->name, params_rate(params),
2057                         params_channels(params), params_format(params));
2058
2059         /* call hw_params on the frontend */
2060         ret = soc_pcm_hw_params(substream, params);
2061         if (ret < 0) {
2062                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
2063                 dpcm_be_dai_hw_free(fe, stream);
2064          } else
2065                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2066
2067 out:
2068         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2069         mutex_unlock(&fe->card->mutex);
2070         return ret;
2071 }
2072
2073 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2074                 struct snd_pcm_substream *substream, int cmd)
2075 {
2076         int ret;
2077
2078         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2079                         dpcm->be->dai_link->name, cmd);
2080
2081         ret = soc_pcm_trigger(substream, cmd);
2082         if (ret < 0)
2083                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2084
2085         return ret;
2086 }
2087
2088 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2089                                int cmd)
2090 {
2091         struct snd_soc_dpcm *dpcm;
2092         int ret = 0;
2093
2094         for_each_dpcm_be(fe, stream, dpcm) {
2095
2096                 struct snd_soc_pcm_runtime *be = dpcm->be;
2097                 struct snd_pcm_substream *be_substream =
2098                         snd_soc_dpcm_get_substream(be, stream);
2099
2100                 /* is this op for this BE ? */
2101                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2102                         continue;
2103
2104                 switch (cmd) {
2105                 case SNDRV_PCM_TRIGGER_START:
2106                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2107                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2108                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2109                                 continue;
2110
2111                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2112                         if (ret)
2113                                 return ret;
2114
2115                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2116                         break;
2117                 case SNDRV_PCM_TRIGGER_RESUME:
2118                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2119                                 continue;
2120
2121                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2122                         if (ret)
2123                                 return ret;
2124
2125                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2126                         break;
2127                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2128                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2129                                 continue;
2130
2131                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2132                         if (ret)
2133                                 return ret;
2134
2135                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2136                         break;
2137                 case SNDRV_PCM_TRIGGER_STOP:
2138                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2139                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2140                                 continue;
2141
2142                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2143                                 continue;
2144
2145                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2146                         if (ret)
2147                                 return ret;
2148
2149                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2150                         break;
2151                 case SNDRV_PCM_TRIGGER_SUSPEND:
2152                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2153                                 continue;
2154
2155                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2156                                 continue;
2157
2158                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2159                         if (ret)
2160                                 return ret;
2161
2162                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2163                         break;
2164                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2165                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2166                                 continue;
2167
2168                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2169                                 continue;
2170
2171                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2172                         if (ret)
2173                                 return ret;
2174
2175                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2176                         break;
2177                 }
2178         }
2179
2180         return ret;
2181 }
2182 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2183
2184 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2185                                   int cmd, bool fe_first)
2186 {
2187         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2188         int ret;
2189
2190         /* call trigger on the frontend before the backend. */
2191         if (fe_first) {
2192                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2193                         fe->dai_link->name, cmd);
2194
2195                 ret = soc_pcm_trigger(substream, cmd);
2196                 if (ret < 0)
2197                         return ret;
2198
2199                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2200                 return ret;
2201         }
2202
2203         /* call trigger on the frontend after the backend. */
2204         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2205         if (ret < 0)
2206                 return ret;
2207
2208         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2209                 fe->dai_link->name, cmd);
2210
2211         ret = soc_pcm_trigger(substream, cmd);
2212
2213         return ret;
2214 }
2215
2216 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2217 {
2218         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2219         int stream = substream->stream;
2220         int ret = 0;
2221         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2222
2223         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2224
2225         switch (trigger) {
2226         case SND_SOC_DPCM_TRIGGER_PRE:
2227                 switch (cmd) {
2228                 case SNDRV_PCM_TRIGGER_START:
2229                 case SNDRV_PCM_TRIGGER_RESUME:
2230                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2231                 case SNDRV_PCM_TRIGGER_DRAIN:
2232                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2233                         break;
2234                 case SNDRV_PCM_TRIGGER_STOP:
2235                 case SNDRV_PCM_TRIGGER_SUSPEND:
2236                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2237                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2238                         break;
2239                 default:
2240                         ret = -EINVAL;
2241                         break;
2242                 }
2243                 break;
2244         case SND_SOC_DPCM_TRIGGER_POST:
2245                 switch (cmd) {
2246                 case SNDRV_PCM_TRIGGER_START:
2247                 case SNDRV_PCM_TRIGGER_RESUME:
2248                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2249                 case SNDRV_PCM_TRIGGER_DRAIN:
2250                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2251                         break;
2252                 case SNDRV_PCM_TRIGGER_STOP:
2253                 case SNDRV_PCM_TRIGGER_SUSPEND:
2254                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2255                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2256                         break;
2257                 default:
2258                         ret = -EINVAL;
2259                         break;
2260                 }
2261                 break;
2262         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2263                 /* bespoke trigger() - handles both FE and BEs */
2264
2265                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2266                                 fe->dai_link->name, cmd);
2267
2268                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2269                 break;
2270         default:
2271                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2272                                 fe->dai_link->name);
2273                 ret = -EINVAL;
2274                 goto out;
2275         }
2276
2277         if (ret < 0) {
2278                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2279                         cmd, ret);
2280                 goto out;
2281         }
2282
2283         switch (cmd) {
2284         case SNDRV_PCM_TRIGGER_START:
2285         case SNDRV_PCM_TRIGGER_RESUME:
2286         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2287                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2288                 break;
2289         case SNDRV_PCM_TRIGGER_STOP:
2290         case SNDRV_PCM_TRIGGER_SUSPEND:
2291                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2292                 break;
2293         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2294                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2295                 break;
2296         }
2297
2298 out:
2299         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2300         return ret;
2301 }
2302
2303 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2304 {
2305         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2306         int stream = substream->stream;
2307
2308         /* if FE's runtime_update is already set, we're in race;
2309          * process this trigger later at exit
2310          */
2311         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2312                 fe->dpcm[stream].trigger_pending = cmd + 1;
2313                 return 0; /* delayed, assuming it's successful */
2314         }
2315
2316         /* we're alone, let's trigger */
2317         return dpcm_fe_dai_do_trigger(substream, cmd);
2318 }
2319
2320 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2321 {
2322         struct snd_soc_dpcm *dpcm;
2323         int ret = 0;
2324
2325         for_each_dpcm_be(fe, stream, dpcm) {
2326
2327                 struct snd_soc_pcm_runtime *be = dpcm->be;
2328                 struct snd_pcm_substream *be_substream =
2329                         snd_soc_dpcm_get_substream(be, stream);
2330
2331                 /* is this op for this BE ? */
2332                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2333                         continue;
2334
2335                 if (!snd_soc_dpcm_can_be_prepared(fe, be, stream))
2336                         continue;
2337
2338                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2339                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2340                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2341                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2342                         continue;
2343
2344                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2345                         be->dai_link->name);
2346
2347                 ret = soc_pcm_prepare(be_substream);
2348                 if (ret < 0) {
2349                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2350                                 ret);
2351                         break;
2352                 }
2353
2354                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2355         }
2356         return ret;
2357 }
2358
2359 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2360 {
2361         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2362         int stream = substream->stream, ret = 0;
2363
2364         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2365
2366         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2367
2368         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2369
2370         /* there is no point preparing this FE if there are no BEs */
2371         if (list_empty(&fe->dpcm[stream].be_clients)) {
2372                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2373                                 fe->dai_link->name);
2374                 ret = -EINVAL;
2375                 goto out;
2376         }
2377
2378         ret = dpcm_be_dai_prepare(fe, stream);
2379         if (ret < 0)
2380                 goto out;
2381
2382         /* call prepare on the frontend */
2383         ret = soc_pcm_prepare(substream);
2384         if (ret < 0) {
2385                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2386                         fe->dai_link->name);
2387                 goto out;
2388         }
2389
2390         /* run the stream event for each BE */
2391         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2392         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2393
2394 out:
2395         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2396         mutex_unlock(&fe->card->mutex);
2397
2398         return ret;
2399 }
2400
2401 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2402 {
2403         struct snd_pcm_substream *substream =
2404                 snd_soc_dpcm_get_substream(fe, stream);
2405         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2406         int err;
2407
2408         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2409                         stream ? "capture" : "playback", fe->dai_link->name);
2410
2411         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2412                 /* call bespoke trigger - FE takes care of all BE triggers */
2413                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2414                                 fe->dai_link->name);
2415
2416                 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2417                 if (err < 0)
2418                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2419         } else {
2420                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2421                         fe->dai_link->name);
2422
2423                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2424                 if (err < 0)
2425                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2426         }
2427
2428         err = dpcm_be_dai_hw_free(fe, stream);
2429         if (err < 0)
2430                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2431
2432         err = dpcm_be_dai_shutdown(fe, stream);
2433         if (err < 0)
2434                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2435
2436         /* run the stream event for each BE */
2437         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2438
2439         return 0;
2440 }
2441
2442 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2443 {
2444         struct snd_pcm_substream *substream =
2445                 snd_soc_dpcm_get_substream(fe, stream);
2446         struct snd_soc_dpcm *dpcm;
2447         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2448         int ret;
2449         unsigned long flags;
2450
2451         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2452                         stream ? "capture" : "playback", fe->dai_link->name);
2453
2454         /* Only start the BE if the FE is ready */
2455         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2456                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2457                 return -EINVAL;
2458
2459         /* startup must always be called for new BEs */
2460         ret = dpcm_be_dai_startup(fe, stream);
2461         if (ret < 0)
2462                 goto disconnect;
2463
2464         /* keep going if FE state is > open */
2465         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2466                 return 0;
2467
2468         ret = dpcm_be_dai_hw_params(fe, stream);
2469         if (ret < 0)
2470                 goto close;
2471
2472         /* keep going if FE state is > hw_params */
2473         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2474                 return 0;
2475
2476
2477         ret = dpcm_be_dai_prepare(fe, stream);
2478         if (ret < 0)
2479                 goto hw_free;
2480
2481         /* run the stream event for each BE */
2482         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2483
2484         /* keep going if FE state is > prepare */
2485         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2486                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2487                 return 0;
2488
2489         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2490                 /* call trigger on the frontend - FE takes care of all BE triggers */
2491                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2492                                 fe->dai_link->name);
2493
2494                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2495                 if (ret < 0) {
2496                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2497                         goto hw_free;
2498                 }
2499         } else {
2500                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2501                         fe->dai_link->name);
2502
2503                 ret = dpcm_be_dai_trigger(fe, stream,
2504                                         SNDRV_PCM_TRIGGER_START);
2505                 if (ret < 0) {
2506                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2507                         goto hw_free;
2508                 }
2509         }
2510
2511         return 0;
2512
2513 hw_free:
2514         dpcm_be_dai_hw_free(fe, stream);
2515 close:
2516         dpcm_be_dai_shutdown(fe, stream);
2517 disconnect:
2518         /* disconnect any closed BEs */
2519         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
2520         for_each_dpcm_be(fe, stream, dpcm) {
2521                 struct snd_soc_pcm_runtime *be = dpcm->be;
2522                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2523                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2524         }
2525         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
2526
2527         return ret;
2528 }
2529
2530 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2531 {
2532         struct snd_soc_dapm_widget_list *list;
2533         int stream;
2534         int count, paths;
2535         int ret;
2536
2537         if (!fe->dai_link->dynamic)
2538                 return 0;
2539
2540         if (fe->num_cpus > 1) {
2541                 dev_err(fe->dev,
2542                         "%s doesn't support Multi CPU yet\n", __func__);
2543                 return -EINVAL;
2544         }
2545
2546         /* only check active links */
2547         if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
2548                 return 0;
2549
2550         /* DAPM sync will call this to update DSP paths */
2551         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2552                 new ? "new" : "old", fe->dai_link->name);
2553
2554         for_each_pcm_streams(stream) {
2555
2556                 /* skip if FE doesn't have playback/capture capability */
2557                 if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
2558                     !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
2559                         continue;
2560
2561                 /* skip if FE isn't currently playing/capturing */
2562                 if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
2563                     !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
2564                         continue;
2565
2566                 paths = dpcm_path_get(fe, stream, &list);
2567                 if (paths < 0) {
2568                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2569                                  fe->dai_link->name,
2570                                  stream == SNDRV_PCM_STREAM_PLAYBACK ?
2571                                  "playback" : "capture");
2572                         return paths;
2573                 }
2574
2575                 /* update any playback/capture paths */
2576                 count = dpcm_process_paths(fe, stream, &list, new);
2577                 if (count) {
2578                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2579                         if (new)
2580                                 ret = dpcm_run_update_startup(fe, stream);
2581                         else
2582                                 ret = dpcm_run_update_shutdown(fe, stream);
2583                         if (ret < 0)
2584                                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2585                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2586
2587                         dpcm_clear_pending_state(fe, stream);
2588                         dpcm_be_disconnect(fe, stream);
2589                 }
2590
2591                 dpcm_path_put(&list);
2592         }
2593
2594         return 0;
2595 }
2596
2597 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2598  * any DAI links.
2599  */
2600 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2601 {
2602         struct snd_soc_pcm_runtime *fe;
2603         int ret = 0;
2604
2605         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2606         /* shutdown all old paths first */
2607         for_each_card_rtds(card, fe) {
2608                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2609                 if (ret)
2610                         goto out;
2611         }
2612
2613         /* bring new paths up */
2614         for_each_card_rtds(card, fe) {
2615                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2616                 if (ret)
2617                         goto out;
2618         }
2619
2620 out:
2621         mutex_unlock(&card->mutex);
2622         return ret;
2623 }
2624 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2625
2626 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2627 {
2628         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2629         struct snd_soc_dpcm *dpcm;
2630         int stream = fe_substream->stream;
2631
2632         /* mark FE's links ready to prune */
2633         for_each_dpcm_be(fe, stream, dpcm)
2634                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2635
2636         dpcm_be_disconnect(fe, stream);
2637
2638         fe->dpcm[stream].runtime = NULL;
2639 }
2640
2641 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2642 {
2643         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2644         int ret;
2645
2646         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2647         ret = dpcm_fe_dai_shutdown(fe_substream);
2648
2649         dpcm_fe_dai_cleanup(fe_substream);
2650
2651         mutex_unlock(&fe->card->mutex);
2652         return ret;
2653 }
2654
2655 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2656 {
2657         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2658         struct snd_soc_dapm_widget_list *list;
2659         int ret;
2660         int stream = fe_substream->stream;
2661
2662         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2663         fe->dpcm[stream].runtime = fe_substream->runtime;
2664
2665         ret = dpcm_path_get(fe, stream, &list);
2666         if (ret < 0) {
2667                 goto open_end;
2668         } else if (ret == 0) {
2669                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2670                         fe->dai_link->name, stream ? "capture" : "playback");
2671         }
2672
2673         /* calculate valid and active FE <-> BE dpcms */
2674         dpcm_process_paths(fe, stream, &list, 1);
2675
2676         ret = dpcm_fe_dai_startup(fe_substream);
2677         if (ret < 0)
2678                 dpcm_fe_dai_cleanup(fe_substream);
2679
2680         dpcm_clear_pending_state(fe, stream);
2681         dpcm_path_put(&list);
2682 open_end:
2683         mutex_unlock(&fe->card->mutex);
2684         return ret;
2685 }
2686
2687 /* create a new pcm */
2688 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2689 {
2690         struct snd_soc_dai *codec_dai;
2691         struct snd_soc_dai *cpu_dai;
2692         struct snd_soc_component *component;
2693         struct snd_pcm *pcm;
2694         char new_name[64];
2695         int ret = 0, playback = 0, capture = 0;
2696         int stream;
2697         int i;
2698
2699         if (rtd->dai_link->dynamic && rtd->num_cpus > 1) {
2700                 dev_err(rtd->dev,
2701                         "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2702                 return -EINVAL;
2703         }
2704
2705         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2706                 if (rtd->dai_link->dpcm_playback) {
2707                         stream = SNDRV_PCM_STREAM_PLAYBACK;
2708
2709                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2710                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2711                                         playback = 1;
2712                                         break;
2713                                 }
2714                         }
2715
2716                         if (!playback) {
2717                                 dev_err(rtd->card->dev,
2718                                         "No CPU DAIs support playback for stream %s\n",
2719                                         rtd->dai_link->stream_name);
2720                                 return -EINVAL;
2721                         }
2722                 }
2723                 if (rtd->dai_link->dpcm_capture) {
2724                         stream = SNDRV_PCM_STREAM_CAPTURE;
2725
2726                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2727                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2728                                         capture = 1;
2729                                         break;
2730                                 }
2731                         }
2732
2733                         if (!capture) {
2734                                 dev_err(rtd->card->dev,
2735                                         "No CPU DAIs support capture for stream %s\n",
2736                                         rtd->dai_link->stream_name);
2737                                 return -EINVAL;
2738                         }
2739                 }
2740         } else {
2741                 /* Adapt stream for codec2codec links */
2742                 int cpu_capture = rtd->dai_link->params ?
2743                         SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
2744                 int cpu_playback = rtd->dai_link->params ?
2745                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2746
2747                 for_each_rtd_codec_dais(rtd, i, codec_dai) {
2748                         if (rtd->num_cpus == 1) {
2749                                 cpu_dai = asoc_rtd_to_cpu(rtd, 0);
2750                         } else if (rtd->num_cpus == rtd->num_codecs) {
2751                                 cpu_dai = asoc_rtd_to_cpu(rtd, i);
2752                         } else {
2753                                 dev_err(rtd->card->dev,
2754                                         "N cpus to M codecs link is not supported yet\n");
2755                                 return -EINVAL;
2756                         }
2757
2758                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2759                             snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2760                                 playback = 1;
2761                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2762                             snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2763                                 capture = 1;
2764                 }
2765         }
2766
2767         if (rtd->dai_link->playback_only) {
2768                 playback = 1;
2769                 capture = 0;
2770         }
2771
2772         if (rtd->dai_link->capture_only) {
2773                 playback = 0;
2774                 capture = 1;
2775         }
2776
2777         /* create the PCM */
2778         if (rtd->dai_link->params) {
2779                 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2780                          rtd->dai_link->stream_name);
2781
2782                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2783                                            playback, capture, &pcm);
2784         } else if (rtd->dai_link->no_pcm) {
2785                 snprintf(new_name, sizeof(new_name), "(%s)",
2786                         rtd->dai_link->stream_name);
2787
2788                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2789                                 playback, capture, &pcm);
2790         } else {
2791                 if (rtd->dai_link->dynamic)
2792                         snprintf(new_name, sizeof(new_name), "%s (*)",
2793                                 rtd->dai_link->stream_name);
2794                 else
2795                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2796                                 rtd->dai_link->stream_name,
2797                                 (rtd->num_codecs > 1) ?
2798                                 "multicodec" : asoc_rtd_to_codec(rtd, 0)->name, num);
2799
2800                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2801                         capture, &pcm);
2802         }
2803         if (ret < 0) {
2804                 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2805                         new_name, rtd->dai_link->name, ret);
2806                 return ret;
2807         }
2808         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2809
2810         /* DAPM dai link stream work */
2811         if (rtd->dai_link->params)
2812                 rtd->close_delayed_work_func = codec2codec_close_delayed_work;
2813         else
2814                 rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2815
2816         pcm->nonatomic = rtd->dai_link->nonatomic;
2817         rtd->pcm = pcm;
2818         pcm->private_data = rtd;
2819
2820         if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
2821                 if (playback)
2822                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2823                 if (capture)
2824                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2825                 goto out;
2826         }
2827
2828         /* ASoC PCM operations */
2829         if (rtd->dai_link->dynamic) {
2830                 rtd->ops.open           = dpcm_fe_dai_open;
2831                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2832                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2833                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2834                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2835                 rtd->ops.close          = dpcm_fe_dai_close;
2836                 rtd->ops.pointer        = soc_pcm_pointer;
2837         } else {
2838                 rtd->ops.open           = soc_pcm_open;
2839                 rtd->ops.hw_params      = soc_pcm_hw_params;
2840                 rtd->ops.prepare        = soc_pcm_prepare;
2841                 rtd->ops.trigger        = soc_pcm_trigger;
2842                 rtd->ops.hw_free        = soc_pcm_hw_free;
2843                 rtd->ops.close          = soc_pcm_close;
2844                 rtd->ops.pointer        = soc_pcm_pointer;
2845         }
2846
2847         for_each_rtd_components(rtd, i, component) {
2848                 const struct snd_soc_component_driver *drv = component->driver;
2849
2850                 if (drv->ioctl)
2851                         rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2852                 if (drv->sync_stop)
2853                         rtd->ops.sync_stop      = snd_soc_pcm_component_sync_stop;
2854                 if (drv->copy_user)
2855                         rtd->ops.copy_user      = snd_soc_pcm_component_copy_user;
2856                 if (drv->page)
2857                         rtd->ops.page           = snd_soc_pcm_component_page;
2858                 if (drv->mmap)
2859                         rtd->ops.mmap           = snd_soc_pcm_component_mmap;
2860         }
2861
2862         if (playback)
2863                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2864
2865         if (capture)
2866                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2867
2868         ret = snd_soc_pcm_component_new(rtd);
2869         if (ret < 0) {
2870                 dev_err(rtd->dev, "ASoC: pcm %s constructor failed for dailink %s: %d\n",
2871                         new_name, rtd->dai_link->name, ret);
2872                 return ret;
2873         }
2874
2875         pcm->no_device_suspend = true;
2876 out:
2877         dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
2878                 (rtd->num_codecs > 1) ? "multicodec" : asoc_rtd_to_codec(rtd, 0)->name,
2879                 (rtd->num_cpus > 1)   ? "multicpu"   : asoc_rtd_to_cpu(rtd, 0)->name);
2880         return ret;
2881 }
2882
2883 /* is the current PCM operation for this FE ? */
2884 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2885 {
2886         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2887                 return 1;
2888         return 0;
2889 }
2890 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2891
2892 /* is the current PCM operation for this BE ? */
2893 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2894                 struct snd_soc_pcm_runtime *be, int stream)
2895 {
2896         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2897            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2898                   be->dpcm[stream].runtime_update))
2899                 return 1;
2900         return 0;
2901 }
2902 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2903
2904 /* get the substream for this BE */
2905 struct snd_pcm_substream *
2906         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2907 {
2908         return be->pcm->streams[stream].substream;
2909 }
2910 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2911
2912 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
2913                                     struct snd_soc_pcm_runtime *be,
2914                                     int stream,
2915                                     const enum snd_soc_dpcm_state *states,
2916                                     int num_states)
2917 {
2918         struct snd_soc_dpcm *dpcm;
2919         int state;
2920         int ret = 1;
2921         unsigned long flags;
2922         int i;
2923
2924         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
2925         for_each_dpcm_fe(be, stream, dpcm) {
2926
2927                 if (dpcm->fe == fe)
2928                         continue;
2929
2930                 state = dpcm->fe->dpcm[stream].state;
2931                 for (i = 0; i < num_states; i++) {
2932                         if (state == states[i]) {
2933                                 ret = 0;
2934                                 break;
2935                         }
2936                 }
2937         }
2938         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
2939
2940         /* it's safe to do this BE DAI */
2941         return ret;
2942 }
2943
2944 /*
2945  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2946  * are not running, paused or suspended for the specified stream direction.
2947  */
2948 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2949                 struct snd_soc_pcm_runtime *be, int stream)
2950 {
2951         const enum snd_soc_dpcm_state state[] = {
2952                 SND_SOC_DPCM_STATE_START,
2953                 SND_SOC_DPCM_STATE_PAUSED,
2954                 SND_SOC_DPCM_STATE_SUSPEND,
2955         };
2956
2957         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
2958 }
2959 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2960
2961 /*
2962  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2963  * running, paused or suspended for the specified stream direction.
2964  */
2965 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2966                 struct snd_soc_pcm_runtime *be, int stream)
2967 {
2968         const enum snd_soc_dpcm_state state[] = {
2969                 SND_SOC_DPCM_STATE_START,
2970                 SND_SOC_DPCM_STATE_PAUSED,
2971                 SND_SOC_DPCM_STATE_SUSPEND,
2972                 SND_SOC_DPCM_STATE_PREPARE,
2973         };
2974
2975         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
2976 }
2977 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2978
2979 /*
2980  * We can only prepare a BE DAI if any of it's FE are not prepared,
2981  * running or paused for the specified stream direction.
2982  */
2983 int snd_soc_dpcm_can_be_prepared(struct snd_soc_pcm_runtime *fe,
2984                                  struct snd_soc_pcm_runtime *be, int stream)
2985 {
2986         const enum snd_soc_dpcm_state state[] = {
2987                 SND_SOC_DPCM_STATE_START,
2988                 SND_SOC_DPCM_STATE_PAUSED,
2989                 SND_SOC_DPCM_STATE_PREPARE,
2990         };
2991
2992         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
2993 }
2994 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_prepared);