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 static inline void snd_soc_dpcm_mutex_lock(struct snd_soc_pcm_runtime *rtd)
  31 {
  32         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
  33 }
  34
  35 static inline void snd_soc_dpcm_mutex_unlock(struct snd_soc_pcm_runtime *rtd)
  36 {
  37         mutex_unlock(&rtd->card->pcm_mutex);
  38 }
  39
  40 #define snd_soc_dpcm_mutex_assert_held(rtd) \
  41         lockdep_assert_held(&(rtd)->card->pcm_mutex)
  42
  43 static inline void snd_soc_dpcm_stream_lock_irq(struct snd_soc_pcm_runtime *rtd,
  44                                                 int stream)
  45 {
  46         snd_pcm_stream_lock_irq(snd_soc_dpcm_get_substream(rtd, stream));
  47 }
  48
  49 #define snd_soc_dpcm_stream_lock_irqsave_nested(rtd, stream, flags) \
  50         snd_pcm_stream_lock_irqsave_nested(snd_soc_dpcm_get_substream(rtd, stream), flags)
  51
  52 static inline void snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime *rtd,
  53                                                   int stream)
  54 {
  55         snd_pcm_stream_unlock_irq(snd_soc_dpcm_get_substream(rtd, stream));
  56 }
  57
  58 #define snd_soc_dpcm_stream_unlock_irqrestore(rtd, stream, flags) \
  59         snd_pcm_stream_unlock_irqrestore(snd_soc_dpcm_get_substream(rtd, stream), flags)
  60
  61 #define DPCM_MAX_BE_USERS       8
  62
  63 static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd)
  64 {
  65         return (rtd)->num_cpus == 1 ? asoc_rtd_to_cpu(rtd, 0)->name : "multicpu";
  66 }
  67 static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd)
  68 {
  69         return (rtd)->num_codecs == 1 ? asoc_rtd_to_codec(rtd, 0)->name : "multicodec";
  70 }
  71
  72 #ifdef CONFIG_DEBUG_FS
  73 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
  74 {
  75         switch (state) {
  76         case SND_SOC_DPCM_STATE_NEW:
  77                 return "new";
  78         case SND_SOC_DPCM_STATE_OPEN:
  79                 return "open";
  80         case SND_SOC_DPCM_STATE_HW_PARAMS:
  81                 return "hw_params";
  82         case SND_SOC_DPCM_STATE_PREPARE:
  83                 return "prepare";
  84         case SND_SOC_DPCM_STATE_START:
  85                 return "start";
  86         case SND_SOC_DPCM_STATE_STOP:
  87                 return "stop";
  88         case SND_SOC_DPCM_STATE_SUSPEND:
  89                 return "suspend";
  90         case SND_SOC_DPCM_STATE_PAUSED:
  91                 return "paused";
  92         case SND_SOC_DPCM_STATE_HW_FREE:
  93                 return "hw_free";
  94         case SND_SOC_DPCM_STATE_CLOSE:
  95                 return "close";
  96         }
  97
  98         return "unknown";
  99 }
 100
 101 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
 102                                int stream, char *buf, size_t size)
 103 {
 104         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
 105         struct snd_soc_dpcm *dpcm;
 106         ssize_t offset = 0;
 107
 108         /* FE state */
 109         offset += scnprintf(buf + offset, size - offset,
 110                            "[%s - %s]\n", fe->dai_link->name,
 111                            stream ? "Capture" : "Playback");
 112
 113         offset += scnprintf(buf + offset, size - offset, "State: %s\n",
 114                            dpcm_state_string(fe->dpcm[stream].state));
 115
 116         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
 117             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
 118                 offset += scnprintf(buf + offset, size - offset,
 119                                    "Hardware Params: "
 120                                    "Format = %s, Channels = %d, Rate = %d\n",
 121                                    snd_pcm_format_name(params_format(params)),
 122                                    params_channels(params),
 123                                    params_rate(params));
 124
 125         /* BEs state */
 126         offset += scnprintf(buf + offset, size - offset, "Backends:\n");
 127
 128         if (list_empty(&fe->dpcm[stream].be_clients)) {
 129                 offset += scnprintf(buf + offset, size - offset,
 130                                    " No active DSP links\n");
 131                 goto out;
 132         }
 133
 134         for_each_dpcm_be(fe, stream, dpcm) {
 135                 struct snd_soc_pcm_runtime *be = dpcm->be;
 136                 params = &dpcm->hw_params;
 137
 138                 offset += scnprintf(buf + offset, size - offset,
 139                                    "- %s\n", be->dai_link->name);
 140
 141                 offset += scnprintf(buf + offset, size - offset,
 142                                    "   State: %s\n",
 143                                    dpcm_state_string(be->dpcm[stream].state));
 144
 145                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
 146                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
 147                         offset += scnprintf(buf + offset, size - offset,
 148                                            "   Hardware Params: "
 149                                            "Format = %s, Channels = %d, Rate = %d\n",
 150                                            snd_pcm_format_name(params_format(params)),
 151                                            params_channels(params),
 152                                            params_rate(params));
 153         }
 154 out:
 155         return offset;
 156 }
 157
 158 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
 159                                     size_t count, loff_t *ppos)
 160 {
 161         struct snd_soc_pcm_runtime *fe = file->private_data;
 162         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
 163         int stream;
 164         char *buf;
 165
 166         if (fe->num_cpus > 1) {
 167                 dev_err(fe->dev,
 168                         "%s doesn't support Multi CPU yet\n", __func__);
 169                 return -EINVAL;
 170         }
 171
 172         buf = kmalloc(out_count, GFP_KERNEL);
 173         if (!buf)
 174                 return -ENOMEM;
 175
 176         snd_soc_dpcm_mutex_lock(fe);
 177         for_each_pcm_streams(stream)
 178                 if (snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream))
 179                         offset += dpcm_show_state(fe, stream,
 180                                                   buf + offset,
 181                                                   out_count - offset);
 182         snd_soc_dpcm_mutex_unlock(fe);
 183
 184         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
 185
 186         kfree(buf);
 187         return ret;
 188 }
 189
 190 static const struct file_operations dpcm_state_fops = {
 191         .open = simple_open,
 192         .read = dpcm_state_read_file,
 193         .llseek = default_llseek,
 194 };
 195
 196 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
 197 {
 198         if (!rtd->dai_link->dynamic)
 199                 return;
 200
 201         if (!rtd->card->debugfs_card_root)
 202                 return;
 203
 204         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
 205                                                     rtd->card->debugfs_card_root);
 206
 207         debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
 208                             rtd, &dpcm_state_fops);
 209 }
 210
 211 static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream)
 212 {
 213         char *name;
 214
 215         name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name,
 216                          stream ? "capture" : "playback");
 217         if (name) {
 218                 dpcm->debugfs_state = debugfs_create_dir(
 219                         name, dpcm->fe->debugfs_dpcm_root);
 220                 debugfs_create_u32("state", 0644, dpcm->debugfs_state,
 221                                    &dpcm->state);
 222                 kfree(name);
 223         }
 224 }
 225
 226 static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 227 {
 228         debugfs_remove_recursive(dpcm->debugfs_state);
 229 }
 230
 231 #else
 232 static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
 233                                              int stream)
 234 {
 235 }
 236
 237 static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 238 {
 239 }
 240 #endif
 241
 242 /* Set FE's runtime_update state; the state is protected via PCM stream lock
 243  * for avoiding the race with trigger callback.
 244  * If the state is unset and a trigger is pending while the previous operation,
 245  * process the pending trigger action here.
 246  */
 247 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
 248 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
 249                                      int stream, enum snd_soc_dpcm_update state)
 250 {
 251         struct snd_pcm_substream *substream =
 252                 snd_soc_dpcm_get_substream(fe, stream);
 253
 254         snd_soc_dpcm_stream_lock_irq(fe, stream);
 255         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
 256                 dpcm_fe_dai_do_trigger(substream,
 257                                        fe->dpcm[stream].trigger_pending - 1);
 258                 fe->dpcm[stream].trigger_pending = 0;
 259         }
 260         fe->dpcm[stream].runtime_update = state;
 261         snd_soc_dpcm_stream_unlock_irq(fe, stream);
 262 }
 263
 264 static void dpcm_set_be_update_state(struct snd_soc_pcm_runtime *be,
 265                                      int stream, enum snd_soc_dpcm_update state)
 266 {
 267         be->dpcm[stream].runtime_update = state;
 268 }
 269
 270 /**
 271  * snd_soc_runtime_action() - Increment/Decrement active count for
 272  * PCM runtime components
 273  * @rtd: ASoC PCM runtime that is activated
 274  * @stream: Direction of the PCM stream
 275  * @action: Activate stream if 1. Deactivate if -1.
 276  *
 277  * Increments/Decrements the active count for all the DAIs and components
 278  * attached to a PCM runtime.
 279  * Should typically be called when a stream is opened.
 280  *
 281  * Must be called with the rtd->card->pcm_mutex being held
 282  */
 283 void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
 284                             int stream, int action)
 285 {
 286         struct snd_soc_dai *dai;
 287         int i;
 288
 289         snd_soc_dpcm_mutex_assert_held(rtd);
 290
 291         for_each_rtd_dais(rtd, i, dai)
 292                 snd_soc_dai_action(dai, stream, action);
 293 }
 294 EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
 295
 296 /**
 297  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 298  * @rtd: The ASoC PCM runtime that should be checked.
 299  *
 300  * This function checks whether the power down delay should be ignored for a
 301  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 302  * been configured to ignore the delay, or if none of the components benefits
 303  * from having the delay.
 304  */
 305 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 306 {
 307         struct snd_soc_component *component;
 308         bool ignore = true;
 309         int i;
 310
 311         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 312                 return true;
 313
 314         for_each_rtd_components(rtd, i, component)
 315                 ignore &= !component->driver->use_pmdown_time;
 316
 317         return ignore;
 318 }
 319
 320 /**
 321  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 322  * @substream: the pcm substream
 323  * @hw: the hardware parameters
 324  *
 325  * Sets the substream runtime hardware parameters.
 326  */
 327 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 328         const struct snd_pcm_hardware *hw)
 329 {
 330         substream->runtime->hw = *hw;
 331
 332         return 0;
 333 }
 334 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 335
 336 /* DPCM stream event, send event to FE and all active BEs. */
 337 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 338         int event)
 339 {
 340         struct snd_soc_dpcm *dpcm;
 341
 342         snd_soc_dpcm_mutex_assert_held(fe);
 343
 344         for_each_dpcm_be(fe, dir, dpcm) {
 345
 346                 struct snd_soc_pcm_runtime *be = dpcm->be;
 347
 348                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 349                                 be->dai_link->name, event, dir);
 350
 351                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
 352                     (be->dpcm[dir].users >= 1))
 353                         continue;
 354
 355                 snd_soc_dapm_stream_event(be, dir, event);
 356         }
 357
 358         snd_soc_dapm_stream_event(fe, dir, event);
 359
 360         return 0;
 361 }
 362
 363 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
 364                                    struct snd_pcm_hw_params *params)
 365 {
 366         if (params) {
 367                 dai->rate        = params_rate(params);
 368                 dai->channels    = params_channels(params);
 369                 dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
 370         } else {
 371                 dai->rate        = 0;
 372                 dai->channels    = 0;
 373                 dai->sample_bits = 0;
 374         }
 375 }
 376
 377 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 378                                         struct snd_soc_dai *soc_dai)
 379 {
 380         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 381         int ret;
 382
 383         if (!snd_soc_dai_active(soc_dai))
 384                 return 0;
 385
 386 #define __soc_pcm_apply_symmetry(name, NAME)                            \
 387         if (soc_dai->name && (soc_dai->driver->symmetric_##name ||      \
 388                               rtd->dai_link->symmetric_##name)) {       \
 389                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
 390                         #name, soc_dai->name);                          \
 391                                                                         \
 392                 ret = snd_pcm_hw_constraint_single(substream->runtime,  \
 393                                                    SNDRV_PCM_HW_PARAM_##NAME,\
 394                                                    soc_dai->name);      \
 395                 if (ret < 0) {                                          \
 396                         dev_err(soc_dai->dev,                           \
 397                                 "ASoC: Unable to apply %s constraint: %d\n",\
 398                                 #name, ret);                            \
 399                         return ret;                                     \
 400                 }                                                       \
 401         }
 402
 403         __soc_pcm_apply_symmetry(rate,          RATE);
 404         __soc_pcm_apply_symmetry(channels,      CHANNELS);
 405         __soc_pcm_apply_symmetry(sample_bits,   SAMPLE_BITS);
 406
 407         return 0;
 408 }
 409
 410 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 411                                 struct snd_pcm_hw_params *params)
 412 {
 413         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 414         struct snd_soc_dai d;
 415         struct snd_soc_dai *dai;
 416         struct snd_soc_dai *cpu_dai;
 417         unsigned int symmetry, i;
 418
 419         d.name = __func__;
 420         soc_pcm_set_dai_params(&d, params);
 421
 422 #define __soc_pcm_params_symmetry(xxx)                                  \
 423         symmetry = rtd->dai_link->symmetric_##xxx;                      \
 424         for_each_rtd_dais(rtd, i, dai)                                  \
 425                 symmetry |= dai->driver->symmetric_##xxx;               \
 426                                                                         \
 427         if (symmetry)                                                   \
 428                 for_each_rtd_cpu_dais(rtd, i, cpu_dai)                  \
 429                         if (!snd_soc_dai_is_dummy(cpu_dai) &&           \
 430                             cpu_dai->xxx && cpu_dai->xxx != d.xxx) {    \
 431                                 dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
 432                                         #xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
 433                                 return -EINVAL;                         \
 434                         }
 435
 436         /* reject unmatched parameters when applying symmetry */
 437         __soc_pcm_params_symmetry(rate);
 438         __soc_pcm_params_symmetry(channels);
 439         __soc_pcm_params_symmetry(sample_bits);
 440
 441         return 0;
 442 }
 443
 444 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
 445 {
 446         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 447         struct snd_soc_dai_link *link = rtd->dai_link;
 448         struct snd_soc_dai *dai;
 449         unsigned int symmetry, i;
 450
 451         symmetry = link->symmetric_rate ||
 452                 link->symmetric_channels ||
 453                 link->symmetric_sample_bits;
 454
 455         for_each_rtd_dais(rtd, i, dai)
 456                 symmetry = symmetry ||
 457                         dai->driver->symmetric_rate ||
 458                         dai->driver->symmetric_channels ||
 459                         dai->driver->symmetric_sample_bits;
 460
 461         if (symmetry)
 462                 substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 463 }
 464
 465 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 466 {
 467         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 468         int ret;
 469
 470         if (!bits)
 471                 return;
 472
 473         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 474         if (ret != 0)
 475                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 476                                  bits, ret);
 477 }
 478
 479 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 480 {
 481         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 482         struct snd_soc_dai *cpu_dai;
 483         struct snd_soc_dai *codec_dai;
 484         int stream = substream->stream;
 485         int i;
 486         unsigned int bits = 0, cpu_bits = 0;
 487
 488         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 489                 struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 490
 491                 if (pcm_codec->sig_bits == 0) {
 492                         bits = 0;
 493                         break;
 494                 }
 495                 bits = max(pcm_codec->sig_bits, bits);
 496         }
 497
 498         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 499                 struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 500
 501                 if (pcm_cpu->sig_bits == 0) {
 502                         cpu_bits = 0;
 503                         break;
 504                 }
 505                 cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
 506         }
 507
 508         soc_pcm_set_msb(substream, bits);
 509         soc_pcm_set_msb(substream, cpu_bits);
 510 }
 511
 512 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
 513 {
 514         hw->rates               = UINT_MAX;
 515         hw->rate_min            = 0;
 516         hw->rate_max            = UINT_MAX;
 517         hw->channels_min        = 0;
 518         hw->channels_max        = UINT_MAX;
 519         hw->formats             = ULLONG_MAX;
 520 }
 521
 522 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
 523                                    struct snd_soc_pcm_stream *p)
 524 {
 525         hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
 526
 527         /* setup hw->rate_min/max via hw->rates first */
 528         snd_pcm_hw_limit_rates(hw);
 529
 530         /* update hw->rate_min/max by snd_soc_pcm_stream */
 531         hw->rate_min = max(hw->rate_min, p->rate_min);
 532         hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
 533 }
 534
 535 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
 536                                    struct snd_soc_pcm_stream *p)
 537 {
 538         hw->channels_min = max(hw->channels_min, p->channels_min);
 539         hw->channels_max = min(hw->channels_max, p->channels_max);
 540 }
 541
 542 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
 543                                      struct snd_soc_pcm_stream *p)
 544 {
 545         hw->formats &= p->formats;
 546 }
 547
 548 /**
 549  * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
 550  * @rtd: ASoC PCM runtime
 551  * @hw: PCM hardware parameters (output)
 552  * @stream: Direction of the PCM stream
 553  *
 554  * Calculates the subset of stream parameters supported by all DAIs
 555  * associated with the PCM stream.
 556  */
 557 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
 558                             struct snd_pcm_hardware *hw, int stream)
 559 {
 560         struct snd_soc_dai *codec_dai;
 561         struct snd_soc_dai *cpu_dai;
 562         struct snd_soc_pcm_stream *codec_stream;
 563         struct snd_soc_pcm_stream *cpu_stream;
 564         unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
 565         int i;
 566
 567         soc_pcm_hw_init(hw);
 568
 569         /* first calculate min/max only for CPUs in the DAI link */
 570         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 571
 572                 /*
 573                  * Skip CPUs which don't support the current stream type.
 574                  * Otherwise, since the rate, channel, and format values will
 575                  * zero in that case, we would have no usable settings left,
 576                  * causing the resulting setup to fail.
 577                  */
 578                 if (!snd_soc_dai_stream_valid(cpu_dai, stream))
 579                         continue;
 580
 581                 cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 582
 583                 soc_pcm_hw_update_chan(hw, cpu_stream);
 584                 soc_pcm_hw_update_rate(hw, cpu_stream);
 585                 soc_pcm_hw_update_format(hw, cpu_stream);
 586         }
 587         cpu_chan_min = hw->channels_min;
 588         cpu_chan_max = hw->channels_max;
 589
 590         /* second calculate min/max only for CODECs in the DAI link */
 591         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 592
 593                 /*
 594                  * Skip CODECs which don't support the current stream type.
 595                  * Otherwise, since the rate, channel, and format values will
 596                  * zero in that case, we would have no usable settings left,
 597                  * causing the resulting setup to fail.
 598                  */
 599                 if (!snd_soc_dai_stream_valid(codec_dai, stream))
 600                         continue;
 601
 602                 codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 603
 604                 soc_pcm_hw_update_chan(hw, codec_stream);
 605                 soc_pcm_hw_update_rate(hw, codec_stream);
 606                 soc_pcm_hw_update_format(hw, codec_stream);
 607         }
 608
 609         /* Verify both a valid CPU DAI and a valid CODEC DAI were found */
 610         if (!hw->channels_min)
 611                 return -EINVAL;
 612
 613         /*
 614          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 615          * connected to CPU DAI(s), use CPU DAI's directly and let
 616          * channel allocation be fixed up later
 617          */
 618         if (rtd->num_codecs > 1) {
 619                 hw->channels_min = cpu_chan_min;
 620                 hw->channels_max = cpu_chan_max;
 621         }
 622
 623         return 0;
 624 }
 625 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
 626
 627 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 628 {
 629         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 630         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 631         u64 formats = hw->formats;
 632
 633         /*
 634          * At least one CPU and one CODEC should match. Otherwise, we should
 635          * have bailed out on a higher level, since there would be no CPU or
 636          * CODEC to support the transfer direction in that case.
 637          */
 638         snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
 639
 640         if (formats)
 641                 hw->formats &= formats;
 642 }
 643
 644 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
 645 {
 646         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 647         struct snd_soc_component *component;
 648         int i, ret = 0;
 649
 650         for_each_rtd_components(rtd, i, component) {
 651                 ret = snd_soc_component_module_get_when_open(component, substream);
 652                 if (ret < 0)
 653                         break;
 654
 655                 ret = snd_soc_component_open(component, substream);
 656                 if (ret < 0)
 657                         break;
 658         }
 659
 660         return ret;
 661 }
 662
 663 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
 664                                     int rollback)
 665 {
 666         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 667         struct snd_soc_component *component;
 668         int i, ret = 0;
 669
 670         for_each_rtd_components(rtd, i, component) {
 671                 int r = snd_soc_component_close(component, substream, rollback);
 672                 if (r < 0)
 673                         ret = r; /* use last ret */
 674
 675                 snd_soc_component_module_put_when_close(component, substream, rollback);
 676         }
 677
 678         return ret;
 679 }
 680
 681 static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
 682                          struct snd_pcm_substream *substream, int rollback)
 683 {
 684         struct snd_soc_component *component;
 685         struct snd_soc_dai *dai;
 686         int i;
 687
 688         snd_soc_dpcm_mutex_assert_held(rtd);
 689
 690         if (!rollback)
 691                 snd_soc_runtime_deactivate(rtd, substream->stream);
 692
 693         for_each_rtd_dais(rtd, i, dai)
 694                 snd_soc_dai_shutdown(dai, substream, rollback);
 695
 696         snd_soc_link_shutdown(substream, rollback);
 697
 698         soc_pcm_components_close(substream, rollback);
 699
 700         snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
 701
 702         for_each_rtd_components(rtd, i, component)
 703                 if (!snd_soc_component_active(component))
 704                         pinctrl_pm_select_sleep_state(component->dev);
 705
 706         return 0;
 707 }
 708
 709 /*
 710  * Called by ALSA when a PCM substream is closed. Private data can be
 711  * freed here. The cpu DAI, codec DAI, machine and components are also
 712  * shutdown.
 713  */
 714 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
 715                            struct snd_pcm_substream *substream)
 716 {
 717         return soc_pcm_clean(rtd, substream, 0);
 718 }
 719
 720 /* PCM close ops for non-DPCM streams */
 721 static int soc_pcm_close(struct snd_pcm_substream *substream)
 722 {
 723         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 724
 725         snd_soc_dpcm_mutex_lock(rtd);
 726         soc_pcm_clean(rtd, substream, 0);
 727         snd_soc_dpcm_mutex_unlock(rtd);
 728         return 0;
 729 }
 730
 731 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
 732 {
 733         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 734         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 735         const char *name_cpu = soc_cpu_dai_name(rtd);
 736         const char *name_codec = soc_codec_dai_name(rtd);
 737         const char *err_msg;
 738         struct device *dev = rtd->dev;
 739
 740         err_msg = "rates";
 741         if (!hw->rates)
 742                 goto config_err;
 743
 744         err_msg = "formats";
 745         if (!hw->formats)
 746                 goto config_err;
 747
 748         err_msg = "channels";
 749         if (!hw->channels_min || !hw->channels_max ||
 750              hw->channels_min  >  hw->channels_max)
 751                 goto config_err;
 752
 753         dev_dbg(dev, "ASoC: %s <-> %s info:\n",         name_codec,
 754                                                         name_cpu);
 755         dev_dbg(dev, "ASoC: rate mask 0x%x\n",          hw->rates);
 756         dev_dbg(dev, "ASoC: ch   min %d max %d\n",      hw->channels_min,
 757                                                         hw->channels_max);
 758         dev_dbg(dev, "ASoC: rate min %d max %d\n",      hw->rate_min,
 759                                                         hw->rate_max);
 760
 761         return 0;
 762
 763 config_err:
 764         dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
 765                 name_codec, name_cpu, err_msg);
 766         return -EINVAL;
 767 }
 768
 769 /*
 770  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 771  * then initialized and any private data can be allocated. This also calls
 772  * startup for the cpu DAI, component, machine and codec DAI.
 773  */
 774 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
 775                           struct snd_pcm_substream *substream)
 776 {
 777         struct snd_soc_component *component;
 778         struct snd_soc_dai *dai;
 779         int i, ret = 0;
 780
 781         snd_soc_dpcm_mutex_assert_held(rtd);
 782
 783         for_each_rtd_components(rtd, i, component)
 784                 pinctrl_pm_select_default_state(component->dev);
 785
 786         ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
 787         if (ret < 0)
 788                 goto err;
 789
 790         ret = soc_pcm_components_open(substream);
 791         if (ret < 0)
 792                 goto err;
 793
 794         ret = snd_soc_link_startup(substream);
 795         if (ret < 0)
 796                 goto err;
 797
 798         /* startup the audio subsystem */
 799         for_each_rtd_dais(rtd, i, dai) {
 800                 ret = snd_soc_dai_startup(dai, substream);
 801                 if (ret < 0)
 802                         goto err;
 803
 804                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 805                         dai->tx_mask = 0;
 806                 else
 807                         dai->rx_mask = 0;
 808         }
 809
 810         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 811         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 812                 goto dynamic;
 813
 814         /* Check that the codec and cpu DAIs are compatible */
 815         soc_pcm_init_runtime_hw(substream);
 816
 817         soc_pcm_update_symmetry(substream);
 818
 819         ret = soc_hw_sanity_check(substream);
 820         if (ret < 0)
 821                 goto err;
 822
 823         soc_pcm_apply_msb(substream);
 824
 825         /* Symmetry only applies if we've already got an active stream. */
 826         for_each_rtd_dais(rtd, i, dai) {
 827                 ret = soc_pcm_apply_symmetry(substream, dai);
 828                 if (ret != 0)
 829                         goto err;
 830         }
 831 dynamic:
 832         snd_soc_runtime_activate(rtd, substream->stream);
 833         ret = 0;
 834 err:
 835         if (ret < 0) {
 836                 soc_pcm_clean(rtd, substream, 1);
 837                 dev_err(rtd->dev, "%s() failed (%d)", __func__, ret);
 838         }
 839
 840         return ret;
 841 }
 842
 843 /* PCM open ops for non-DPCM streams */
 844 static int soc_pcm_open(struct snd_pcm_substream *substream)
 845 {
 846         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 847         int ret;
 848
 849         snd_soc_dpcm_mutex_lock(rtd);
 850         ret = __soc_pcm_open(rtd, substream);
 851         snd_soc_dpcm_mutex_unlock(rtd);
 852         return ret;
 853 }
 854
 855 static void codec2codec_close_delayed_work(struct snd_soc_pcm_runtime *rtd)
 856 {
 857         /*
 858          * Currently nothing to do for c2c links
 859          * Since c2c links are internal nodes in the DAPM graph and
 860          * don't interface with the outside world or application layer
 861          * we don't have to do any special handling on close.
 862          */
 863 }
 864
 865 /*
 866  * Called by ALSA when the PCM substream is prepared, can set format, sample
 867  * rate, etc.  This function is non atomic and can be called multiple times,
 868  * it can refer to the runtime info.
 869  */
 870 static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
 871                              struct snd_pcm_substream *substream)
 872 {
 873         struct snd_soc_dai *dai;
 874         int i, ret = 0;
 875
 876         snd_soc_dpcm_mutex_assert_held(rtd);
 877
 878         ret = snd_soc_link_prepare(substream);
 879         if (ret < 0)
 880                 goto out;
 881
 882         ret = snd_soc_pcm_component_prepare(substream);
 883         if (ret < 0)
 884                 goto out;
 885
 886         ret = snd_soc_pcm_dai_prepare(substream);
 887         if (ret < 0)
 888                 goto out;
 889
 890         /* cancel any delayed stream shutdown that is pending */
 891         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 892             rtd->pop_wait) {
 893                 rtd->pop_wait = 0;
 894                 cancel_delayed_work(&rtd->delayed_work);
 895         }
 896
 897         snd_soc_dapm_stream_event(rtd, substream->stream,
 898                         SND_SOC_DAPM_STREAM_START);
 899
 900         for_each_rtd_dais(rtd, i, dai)
 901                 snd_soc_dai_digital_mute(dai, 0, substream->stream);
 902
 903 out:
 904         if (ret < 0)
 905                 dev_err(rtd->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
 906
 907         return ret;
 908 }
 909
 910 /* PCM prepare ops for non-DPCM streams */
 911 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 912 {
 913         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 914         int ret;
 915
 916         snd_soc_dpcm_mutex_lock(rtd);
 917         ret = __soc_pcm_prepare(rtd, substream);
 918         snd_soc_dpcm_mutex_unlock(rtd);
 919         return ret;
 920 }
 921
 922 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 923                                        unsigned int mask)
 924 {
 925         struct snd_interval *interval;
 926         int channels = hweight_long(mask);
 927
 928         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 929         interval->min = channels;
 930         interval->max = channels;
 931 }
 932
 933 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
 934                             struct snd_pcm_substream *substream, int rollback)
 935 {
 936         struct snd_soc_dai *dai;
 937         int i;
 938
 939         snd_soc_dpcm_mutex_assert_held(rtd);
 940
 941         /* clear the corresponding DAIs parameters when going to be inactive */
 942         for_each_rtd_dais(rtd, i, dai) {
 943                 if (snd_soc_dai_active(dai) == 1)
 944                         soc_pcm_set_dai_params(dai, NULL);
 945
 946                 if (snd_soc_dai_stream_active(dai, substream->stream) == 1)
 947                         snd_soc_dai_digital_mute(dai, 1, substream->stream);
 948         }
 949
 950         /* run the stream event */
 951         snd_soc_dapm_stream_stop(rtd, substream->stream);
 952
 953         /* free any machine hw params */
 954         snd_soc_link_hw_free(substream, rollback);
 955
 956         /* free any component resources */
 957         snd_soc_pcm_component_hw_free(substream, rollback);
 958
 959         /* now free hw params for the DAIs  */
 960         for_each_rtd_dais(rtd, i, dai)
 961                 if (snd_soc_dai_stream_valid(dai, substream->stream))
 962                         snd_soc_dai_hw_free(dai, substream, rollback);
 963
 964         return 0;
 965 }
 966
 967 /*
 968  * Frees resources allocated by hw_params, can be called multiple times
 969  */
 970 static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
 971                              struct snd_pcm_substream *substream)
 972 {
 973         return soc_pcm_hw_clean(rtd, substream, 0);
 974 }
 975
 976 /* hw_free PCM ops for non-DPCM streams */
 977 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 978 {
 979         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 980         int ret;
 981
 982         snd_soc_dpcm_mutex_lock(rtd);
 983         ret = __soc_pcm_hw_free(rtd, substream);
 984         snd_soc_dpcm_mutex_unlock(rtd);
 985         return ret;
 986 }
 987
 988 /*
 989  * Called by ALSA when the hardware params are set by application. This
 990  * function can also be called multiple times and can allocate buffers
 991  * (using snd_pcm_lib_* ). It's non-atomic.
 992  */
 993 static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
 994                                struct snd_pcm_substream *substream,
 995                                struct snd_pcm_hw_params *params)
 996 {
 997         struct snd_soc_dai *cpu_dai;
 998         struct snd_soc_dai *codec_dai;
 999         int i, ret = 0;
1000
1001         snd_soc_dpcm_mutex_assert_held(rtd);
1002
1003         ret = soc_pcm_params_symmetry(substream, params);
1004         if (ret)
1005                 goto out;
1006
1007         ret = snd_soc_link_hw_params(substream, params);
1008         if (ret < 0)
1009                 goto out;
1010
1011         for_each_rtd_codec_dais(rtd, i, codec_dai) {
1012                 struct snd_pcm_hw_params codec_params;
1013
1014                 /*
1015                  * Skip CODECs which don't support the current stream type,
1016                  * the idea being that if a CODEC is not used for the currently
1017                  * set up transfer direction, it should not need to be
1018                  * configured, especially since the configuration used might
1019                  * not even be supported by that CODEC. There may be cases
1020                  * however where a CODEC needs to be set up although it is
1021                  * actually not being used for the transfer, e.g. if a
1022                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
1023                  * for the DAI link including a playback-only CODEC.
1024                  * If this becomes necessary, we will have to augment the
1025                  * machine driver setup with information on how to act, so
1026                  * we can do the right thing here.
1027                  */
1028                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1029                         continue;
1030
1031                 /* copy params for each codec */
1032                 codec_params = *params;
1033
1034                 /* fixup params based on TDM slot masks */
1035                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1036                     codec_dai->tx_mask)
1037                         soc_pcm_codec_params_fixup(&codec_params,
1038                                                    codec_dai->tx_mask);
1039
1040                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
1041                     codec_dai->rx_mask)
1042                         soc_pcm_codec_params_fixup(&codec_params,
1043                                                    codec_dai->rx_mask);
1044
1045                 ret = snd_soc_dai_hw_params(codec_dai, substream,
1046                                             &codec_params);
1047                 if(ret < 0)
1048                         goto out;
1049
1050                 soc_pcm_set_dai_params(codec_dai, &codec_params);
1051                 snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
1052         }
1053
1054         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1055                 /*
1056                  * Skip CPUs which don't support the current stream
1057                  * type. See soc_pcm_init_runtime_hw() for more details
1058                  */
1059                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1060                         continue;
1061
1062                 ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
1063                 if (ret < 0)
1064                         goto out;
1065
1066                 /* store the parameters for each DAI */
1067                 soc_pcm_set_dai_params(cpu_dai, params);
1068                 snd_soc_dapm_update_dai(substream, params, cpu_dai);
1069         }
1070
1071         ret = snd_soc_pcm_component_hw_params(substream, params);
1072 out:
1073         if (ret < 0) {
1074                 soc_pcm_hw_clean(rtd, substream, 1);
1075                 dev_err(rtd->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
1076         }
1077
1078         return ret;
1079 }
1080
1081 /* hw_params PCM ops for non-DPCM streams */
1082 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
1083                              struct snd_pcm_hw_params *params)
1084 {
1085         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1086         int ret;
1087
1088         snd_soc_dpcm_mutex_lock(rtd);
1089         ret = __soc_pcm_hw_params(rtd, substream, params);
1090         snd_soc_dpcm_mutex_unlock(rtd);
1091         return ret;
1092 }
1093
1094 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1095 {
1096         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1097         int ret = -EINVAL, _ret = 0;
1098         int rollback = 0;
1099
1100         switch (cmd) {
1101         case SNDRV_PCM_TRIGGER_START:
1102         case SNDRV_PCM_TRIGGER_RESUME:
1103         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1104                 ret = snd_soc_link_trigger(substream, cmd, 0);
1105                 if (ret < 0)
1106                         goto start_err;
1107
1108                 ret = snd_soc_pcm_component_trigger(substream, cmd, 0);
1109                 if (ret < 0)
1110                         goto start_err;
1111
1112                 ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
1113 start_err:
1114                 if (ret < 0)
1115                         rollback = 1;
1116         }
1117
1118         if (rollback) {
1119                 _ret = ret;
1120                 switch (cmd) {
1121                 case SNDRV_PCM_TRIGGER_START:
1122                         cmd = SNDRV_PCM_TRIGGER_STOP;
1123                         break;
1124                 case SNDRV_PCM_TRIGGER_RESUME:
1125                         cmd = SNDRV_PCM_TRIGGER_SUSPEND;
1126                         break;
1127                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1128                         cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
1129                         break;
1130                 }
1131         }
1132
1133         switch (cmd) {
1134         case SNDRV_PCM_TRIGGER_STOP:
1135         case SNDRV_PCM_TRIGGER_SUSPEND:
1136         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1137                 if (rtd->dai_link->stop_dma_first) {
1138                         ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
1139                         if (ret < 0)
1140                                 break;
1141
1142                         ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
1143                         if (ret < 0)
1144                                 break;
1145                 } else {
1146                         ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
1147                         if (ret < 0)
1148                                 break;
1149
1150                         ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
1151                         if (ret < 0)
1152                                 break;
1153                 }
1154                 ret = snd_soc_link_trigger(substream, cmd, rollback);
1155                 break;
1156         }
1157
1158         if (_ret)
1159                 ret = _ret;
1160
1161         return ret;
1162 }
1163
1164 /*
1165  * soc level wrapper for pointer callback
1166  * If cpu_dai, codec_dai, component driver has the delay callback, then
1167  * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
1168  */
1169 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1170 {
1171         struct snd_pcm_runtime *runtime = substream->runtime;
1172         snd_pcm_uframes_t offset = 0;
1173         snd_pcm_sframes_t codec_delay = 0;
1174         snd_pcm_sframes_t cpu_delay = 0;
1175
1176         offset = snd_soc_pcm_component_pointer(substream);
1177
1178         /* should be called *after* snd_soc_pcm_component_pointer() */
1179         snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
1180         snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
1181
1182         runtime->delay = cpu_delay + codec_delay;
1183
1184         return offset;
1185 }
1186
1187 /* connect a FE and BE */
1188 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1189                 struct snd_soc_pcm_runtime *be, int stream)
1190 {
1191         struct snd_pcm_substream *fe_substream;
1192         struct snd_pcm_substream *be_substream;
1193         struct snd_soc_dpcm *dpcm;
1194
1195         snd_soc_dpcm_mutex_assert_held(fe);
1196
1197         /* only add new dpcms */
1198         for_each_dpcm_be(fe, stream, dpcm) {
1199                 if (dpcm->be == be && dpcm->fe == fe)
1200                         return 0;
1201         }
1202
1203         fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1204         be_substream = snd_soc_dpcm_get_substream(be, stream);
1205
1206         if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
1207                 dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
1208                         __func__);
1209                 return -EINVAL;
1210         }
1211         if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
1212                 dev_warn(be->dev, "%s: FE is nonatomic but BE is not, forcing BE as nonatomic\n",
1213                          __func__);
1214                 be_substream->pcm->nonatomic = 1;
1215         }
1216
1217         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1218         if (!dpcm)
1219                 return -ENOMEM;
1220
1221         dpcm->be = be;
1222         dpcm->fe = fe;
1223         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1224         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1225         snd_soc_dpcm_stream_lock_irq(fe, stream);
1226         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1227         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1228         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1229
1230         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1231                         stream ? "capture" : "playback",  fe->dai_link->name,
1232                         stream ? "<-" : "->", be->dai_link->name);
1233
1234         dpcm_create_debugfs_state(dpcm, stream);
1235
1236         return 1;
1237 }
1238
1239 /* reparent a BE onto another FE */
1240 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1241                         struct snd_soc_pcm_runtime *be, int stream)
1242 {
1243         struct snd_soc_dpcm *dpcm;
1244         struct snd_pcm_substream *fe_substream, *be_substream;
1245
1246         /* reparent if BE is connected to other FEs */
1247         if (!be->dpcm[stream].users)
1248                 return;
1249
1250         be_substream = snd_soc_dpcm_get_substream(be, stream);
1251
1252         for_each_dpcm_fe(be, stream, dpcm) {
1253                 if (dpcm->fe == fe)
1254                         continue;
1255
1256                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1257                         stream ? "capture" : "playback",
1258                         dpcm->fe->dai_link->name,
1259                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1260
1261                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1262                 be_substream->runtime = fe_substream->runtime;
1263                 break;
1264         }
1265 }
1266
1267 /* disconnect a BE and FE */
1268 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1269 {
1270         struct snd_soc_dpcm *dpcm, *d;
1271         LIST_HEAD(deleted_dpcms);
1272
1273         snd_soc_dpcm_mutex_assert_held(fe);
1274
1275         snd_soc_dpcm_stream_lock_irq(fe, stream);
1276         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1277                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1278                                 stream ? "capture" : "playback",
1279                                 dpcm->be->dai_link->name);
1280
1281                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1282                         continue;
1283
1284                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1285                         stream ? "capture" : "playback", fe->dai_link->name,
1286                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1287
1288                 /* BEs still alive need new FE */
1289                 dpcm_be_reparent(fe, dpcm->be, stream);
1290
1291                 list_del(&dpcm->list_be);
1292                 list_move(&dpcm->list_fe, &deleted_dpcms);
1293         }
1294         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1295
1296         while (!list_empty(&deleted_dpcms)) {
1297                 dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
1298                                         list_fe);
1299                 list_del(&dpcm->list_fe);
1300                 dpcm_remove_debugfs_state(dpcm);
1301                 kfree(dpcm);
1302         }
1303 }
1304
1305 /* get BE for DAI widget and stream */
1306 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1307                 struct snd_soc_dapm_widget *widget, int stream)
1308 {
1309         struct snd_soc_pcm_runtime *be;
1310         struct snd_soc_dapm_widget *w;
1311         struct snd_soc_dai *dai;
1312         int i;
1313
1314         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1315
1316         for_each_card_rtds(card, be) {
1317
1318                 if (!be->dai_link->no_pcm)
1319                         continue;
1320
1321                 for_each_rtd_dais(be, i, dai) {
1322                         w = snd_soc_dai_get_widget(dai, stream);
1323
1324                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1325                                 w ? w->name : "(not set)");
1326
1327                         if (w == widget)
1328                                 return be;
1329                 }
1330         }
1331
1332         /* Widget provided is not a BE */
1333         return NULL;
1334 }
1335
1336 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1337                 struct snd_soc_dapm_widget *widget)
1338 {
1339         struct snd_soc_dapm_widget *w;
1340         int i;
1341
1342         for_each_dapm_widgets(list, i, w)
1343                 if (widget == w)
1344                         return 1;
1345
1346         return 0;
1347 }
1348
1349 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
1350 {
1351         struct snd_soc_card *card = widget->dapm->card;
1352         struct snd_soc_pcm_runtime *rtd;
1353         int stream;
1354
1355         /* adjust dir to stream */
1356         if (dir == SND_SOC_DAPM_DIR_OUT)
1357                 stream = SNDRV_PCM_STREAM_PLAYBACK;
1358         else
1359                 stream = SNDRV_PCM_STREAM_CAPTURE;
1360
1361         rtd = dpcm_get_be(card, widget, stream);
1362         if (rtd)
1363                 return true;
1364
1365         return false;
1366 }
1367 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
1368
1369 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1370         int stream, struct snd_soc_dapm_widget_list **list)
1371 {
1372         struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
1373         int paths;
1374
1375         if (fe->num_cpus > 1) {
1376                 dev_err(fe->dev,
1377                         "%s doesn't support Multi CPU yet\n", __func__);
1378                 return -EINVAL;
1379         }
1380
1381         /* get number of valid DAI paths and their widgets */
1382         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1383                         fe->card->component_chaining ?
1384                                 NULL : dpcm_end_walk_at_be);
1385
1386         if (paths > 0)
1387                 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1388                         stream ? "capture" : "playback");
1389         else if (paths == 0)
1390                 dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
1391                          stream ? "capture" : "playback");
1392
1393         return paths;
1394 }
1395
1396 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1397 {
1398         snd_soc_dapm_dai_free_widgets(list);
1399 }
1400
1401 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1402                               struct snd_soc_dapm_widget_list *list)
1403 {
1404         struct snd_soc_dai *dai;
1405         unsigned int i;
1406
1407         /* is there a valid DAI widget for this BE */
1408         for_each_rtd_dais(dpcm->be, i, dai) {
1409                 struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
1410
1411                 /*
1412                  * The BE is pruned only if none of the dai
1413                  * widgets are in the active list.
1414                  */
1415                 if (widget && widget_in_list(list, widget))
1416                         return true;
1417         }
1418
1419         return false;
1420 }
1421
1422 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1423                             struct snd_soc_dapm_widget_list **list_)
1424 {
1425         struct snd_soc_dpcm *dpcm;
1426         int prune = 0;
1427
1428         /* Destroy any old FE <--> BE connections */
1429         for_each_dpcm_be(fe, stream, dpcm) {
1430                 if (dpcm_be_is_active(dpcm, stream, *list_))
1431                         continue;
1432
1433                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1434                         stream ? "capture" : "playback",
1435                         dpcm->be->dai_link->name, fe->dai_link->name);
1436                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1437                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
1438                 prune++;
1439         }
1440
1441         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1442         return prune;
1443 }
1444
1445 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1446         struct snd_soc_dapm_widget_list **list_)
1447 {
1448         struct snd_soc_card *card = fe->card;
1449         struct snd_soc_dapm_widget_list *list = *list_;
1450         struct snd_soc_pcm_runtime *be;
1451         struct snd_soc_dapm_widget *widget;
1452         int i, new = 0, err;
1453
1454         /* Create any new FE <--> BE connections */
1455         for_each_dapm_widgets(list, i, widget) {
1456
1457                 switch (widget->id) {
1458                 case snd_soc_dapm_dai_in:
1459                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1460                                 continue;
1461                         break;
1462                 case snd_soc_dapm_dai_out:
1463                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1464                                 continue;
1465                         break;
1466                 default:
1467                         continue;
1468                 }
1469
1470                 /* is there a valid BE rtd for this widget */
1471                 be = dpcm_get_be(card, widget, stream);
1472                 if (!be) {
1473                         dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
1474                                 widget->name);
1475                         continue;
1476                 }
1477
1478                 /* don't connect if FE is not running */
1479                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1480                         continue;
1481
1482                 /*
1483                  * Filter for systems with 'component_chaining' enabled.
1484                  * This helps to avoid unnecessary re-configuration of an
1485                  * already active BE on such systems.
1486                  */
1487                 if (fe->card->component_chaining &&
1488                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1489                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1490                         continue;
1491
1492                 /* newly connected FE and BE */
1493                 err = dpcm_be_connect(fe, be, stream);
1494                 if (err < 0) {
1495                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1496                                 widget->name);
1497                         break;
1498                 } else if (err == 0) /* already connected */
1499                         continue;
1500
1501                 /* new */
1502                 dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
1503                 new++;
1504         }
1505
1506         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1507         return new;
1508 }
1509
1510 /*
1511  * Find the corresponding BE DAIs that source or sink audio to this
1512  * FE substream.
1513  */
1514 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1515         int stream, struct snd_soc_dapm_widget_list **list, int new)
1516 {
1517         if (new)
1518                 return dpcm_add_paths(fe, stream, list);
1519         else
1520                 return dpcm_prune_paths(fe, stream, list);
1521 }
1522
1523 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1524 {
1525         struct snd_soc_dpcm *dpcm;
1526
1527         for_each_dpcm_be(fe, stream, dpcm)
1528                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
1529 }
1530
1531 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
1532                       int do_hw_free, struct snd_soc_dpcm *last)
1533 {
1534         struct snd_soc_dpcm *dpcm;
1535
1536         /* disable any enabled and non active backends */
1537         for_each_dpcm_be(fe, stream, dpcm) {
1538                 struct snd_soc_pcm_runtime *be = dpcm->be;
1539                 struct snd_pcm_substream *be_substream =
1540                         snd_soc_dpcm_get_substream(be, stream);
1541
1542                 if (dpcm == last)
1543                         return;
1544
1545                 /* is this op for this BE ? */
1546                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1547                         continue;
1548
1549                 if (be->dpcm[stream].users == 0) {
1550                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1551                                 stream ? "capture" : "playback",
1552                                 be->dpcm[stream].state);
1553                         continue;
1554                 }
1555
1556                 if (--be->dpcm[stream].users != 0)
1557                         continue;
1558
1559                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
1560                         if (!do_hw_free)
1561                                 continue;
1562
1563                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
1564                                 __soc_pcm_hw_free(be, be_substream);
1565                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1566                         }
1567                 }
1568
1569                 __soc_pcm_close(be, be_substream);
1570                 be_substream->runtime = NULL;
1571                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1572         }
1573 }
1574
1575 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1576 {
1577         struct snd_soc_pcm_runtime *be;
1578         struct snd_soc_dpcm *dpcm;
1579         int err, count = 0;
1580
1581         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1582         for_each_dpcm_be(fe, stream, dpcm) {
1583                 struct snd_pcm_substream *be_substream;
1584
1585                 be = dpcm->be;
1586                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1587
1588                 if (!be_substream) {
1589                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1590                                 stream ? "capture" : "playback");
1591                         continue;
1592                 }
1593
1594                 /* is this op for this BE ? */
1595                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1596                         continue;
1597
1598                 /* first time the dpcm is open ? */
1599                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
1600                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1601                                 stream ? "capture" : "playback",
1602                                 be->dpcm[stream].state);
1603                         continue;
1604                 }
1605
1606                 if (be->dpcm[stream].users++ != 0)
1607                         continue;
1608
1609                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1610                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1611                         continue;
1612
1613                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1614                         stream ? "capture" : "playback", be->dai_link->name);
1615
1616                 be_substream->runtime = be->dpcm[stream].runtime;
1617                 err = __soc_pcm_open(be, be_substream);
1618                 if (err < 0) {
1619                         be->dpcm[stream].users--;
1620                         if (be->dpcm[stream].users < 0)
1621                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1622                                         stream ? "capture" : "playback",
1623                                         be->dpcm[stream].state);
1624
1625                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1626                         goto unwind;
1627                 }
1628                 be->dpcm[stream].be_start = 0;
1629                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1630                 count++;
1631         }
1632
1633         return count;
1634
1635 unwind:
1636         dpcm_be_dai_startup_rollback(fe, stream, dpcm);
1637
1638         dev_err(fe->dev, "ASoC: %s() failed at %s (%d)\n",
1639                 __func__, be->dai_link->name, err);
1640
1641         return err;
1642 }
1643
1644 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
1645 {
1646         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1647         struct snd_pcm_runtime *runtime = substream->runtime;
1648         struct snd_pcm_hardware *hw = &runtime->hw;
1649         struct snd_soc_dai *dai;
1650         int stream = substream->stream;
1651         int i;
1652
1653         soc_pcm_hw_init(hw);
1654
1655         for_each_rtd_cpu_dais(fe, i, dai) {
1656                 struct snd_soc_pcm_stream *cpu_stream;
1657
1658                 /*
1659                  * Skip CPUs which don't support the current stream
1660                  * type. See soc_pcm_init_runtime_hw() for more details
1661                  */
1662                 if (!snd_soc_dai_stream_valid(dai, stream))
1663                         continue;
1664
1665                 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1666
1667                 soc_pcm_hw_update_rate(hw, cpu_stream);
1668                 soc_pcm_hw_update_chan(hw, cpu_stream);
1669                 soc_pcm_hw_update_format(hw, cpu_stream);
1670         }
1671
1672 }
1673
1674 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
1675 {
1676         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1677         struct snd_pcm_runtime *runtime = substream->runtime;
1678         struct snd_pcm_hardware *hw = &runtime->hw;
1679         struct snd_soc_dpcm *dpcm;
1680         struct snd_soc_dai *dai;
1681         int stream = substream->stream;
1682
1683         if (!fe->dai_link->dpcm_merged_format)
1684                 return;
1685
1686         /*
1687          * It returns merged BE codec format
1688          * if FE want to use it (= dpcm_merged_format)
1689          */
1690
1691         for_each_dpcm_be(fe, stream, dpcm) {
1692                 struct snd_soc_pcm_runtime *be = dpcm->be;
1693                 struct snd_soc_pcm_stream *codec_stream;
1694                 int i;
1695
1696                 for_each_rtd_codec_dais(be, i, dai) {
1697                         /*
1698                          * Skip CODECs which don't support the current stream
1699                          * type. See soc_pcm_init_runtime_hw() for more details
1700                          */
1701                         if (!snd_soc_dai_stream_valid(dai, stream))
1702                                 continue;
1703
1704                         codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1705
1706                         soc_pcm_hw_update_format(hw, codec_stream);
1707                 }
1708         }
1709 }
1710
1711 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
1712 {
1713         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1714         struct snd_pcm_runtime *runtime = substream->runtime;
1715         struct snd_pcm_hardware *hw = &runtime->hw;
1716         struct snd_soc_dpcm *dpcm;
1717         int stream = substream->stream;
1718
1719         if (!fe->dai_link->dpcm_merged_chan)
1720                 return;
1721
1722         /*
1723          * It returns merged BE codec channel;
1724          * if FE want to use it (= dpcm_merged_chan)
1725          */
1726
1727         for_each_dpcm_be(fe, stream, dpcm) {
1728                 struct snd_soc_pcm_runtime *be = dpcm->be;
1729                 struct snd_soc_pcm_stream *cpu_stream;
1730                 struct snd_soc_dai *dai;
1731                 int i;
1732
1733                 for_each_rtd_cpu_dais(be, i, dai) {
1734                         /*
1735                          * Skip CPUs which don't support the current stream
1736                          * type. See soc_pcm_init_runtime_hw() for more details
1737                          */
1738                         if (!snd_soc_dai_stream_valid(dai, stream))
1739                                 continue;
1740
1741                         cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1742
1743                         soc_pcm_hw_update_chan(hw, cpu_stream);
1744                 }
1745
1746                 /*
1747                  * chan min/max cannot be enforced if there are multiple CODEC
1748                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1749                  */
1750                 if (be->num_codecs == 1) {
1751                         struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
1752                                 asoc_rtd_to_codec(be, 0), stream);
1753
1754                         soc_pcm_hw_update_chan(hw, codec_stream);
1755                 }
1756         }
1757 }
1758
1759 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
1760 {
1761         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1762         struct snd_pcm_runtime *runtime = substream->runtime;
1763         struct snd_pcm_hardware *hw = &runtime->hw;
1764         struct snd_soc_dpcm *dpcm;
1765         int stream = substream->stream;
1766
1767         if (!fe->dai_link->dpcm_merged_rate)
1768                 return;
1769
1770         /*
1771          * It returns merged BE codec channel;
1772          * if FE want to use it (= dpcm_merged_chan)
1773          */
1774
1775         for_each_dpcm_be(fe, stream, dpcm) {
1776                 struct snd_soc_pcm_runtime *be = dpcm->be;
1777                 struct snd_soc_pcm_stream *pcm;
1778                 struct snd_soc_dai *dai;
1779                 int i;
1780
1781                 for_each_rtd_dais(be, i, dai) {
1782                         /*
1783                          * Skip DAIs which don't support the current stream
1784                          * type. See soc_pcm_init_runtime_hw() for more details
1785                          */
1786                         if (!snd_soc_dai_stream_valid(dai, stream))
1787                                 continue;
1788
1789                         pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1790
1791                         soc_pcm_hw_update_rate(hw, pcm);
1792                 }
1793         }
1794 }
1795
1796 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1797                                int stream)
1798 {
1799         struct snd_soc_dpcm *dpcm;
1800         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1801         struct snd_soc_dai *fe_cpu_dai;
1802         int err = 0;
1803         int i;
1804
1805         /* apply symmetry for FE */
1806         soc_pcm_update_symmetry(fe_substream);
1807
1808         for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1809                 /* Symmetry only applies if we've got an active stream. */
1810                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1811                 if (err < 0)
1812                         goto error;
1813         }
1814
1815         /* apply symmetry for BE */
1816         for_each_dpcm_be(fe, stream, dpcm) {
1817                 struct snd_soc_pcm_runtime *be = dpcm->be;
1818                 struct snd_pcm_substream *be_substream =
1819                         snd_soc_dpcm_get_substream(be, stream);
1820                 struct snd_soc_pcm_runtime *rtd;
1821                 struct snd_soc_dai *dai;
1822
1823                 /* A backend may not have the requested substream */
1824                 if (!be_substream)
1825                         continue;
1826
1827                 rtd = asoc_substream_to_rtd(be_substream);
1828                 if (rtd->dai_link->be_hw_params_fixup)
1829                         continue;
1830
1831                 soc_pcm_update_symmetry(be_substream);
1832
1833                 /* Symmetry only applies if we've got an active stream. */
1834                 for_each_rtd_dais(rtd, i, dai) {
1835                         err = soc_pcm_apply_symmetry(fe_substream, dai);
1836                         if (err < 0)
1837                                 goto error;
1838                 }
1839         }
1840 error:
1841         if (err < 0)
1842                 dev_err(fe->dev, "ASoC: %s failed (%d)\n", __func__, err);
1843
1844         return err;
1845 }
1846
1847 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1848 {
1849         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1850         int stream = fe_substream->stream, ret = 0;
1851
1852         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1853
1854         ret = dpcm_be_dai_startup(fe, stream);
1855         if (ret < 0)
1856                 goto be_err;
1857
1858         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1859
1860         /* start the DAI frontend */
1861         ret = __soc_pcm_open(fe, fe_substream);
1862         if (ret < 0)
1863                 goto unwind;
1864
1865         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1866
1867         dpcm_runtime_setup_fe(fe_substream);
1868
1869         dpcm_runtime_setup_be_format(fe_substream);
1870         dpcm_runtime_setup_be_chan(fe_substream);
1871         dpcm_runtime_setup_be_rate(fe_substream);
1872
1873         ret = dpcm_apply_symmetry(fe_substream, stream);
1874
1875 unwind:
1876         if (ret < 0)
1877                 dpcm_be_dai_startup_unwind(fe, stream);
1878 be_err:
1879         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1880
1881         if (ret < 0)
1882                 dev_err(fe->dev, "%s() failed (%d)\n", __func__, ret);
1883
1884         return ret;
1885 }
1886
1887 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1888 {
1889         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1890         int stream = substream->stream;
1891
1892         snd_soc_dpcm_mutex_assert_held(fe);
1893
1894         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1895
1896         /* shutdown the BEs */
1897         dpcm_be_dai_shutdown(fe, stream);
1898
1899         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1900
1901         /* now shutdown the frontend */
1902         __soc_pcm_close(fe, substream);
1903
1904         /* run the stream stop event */
1905         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1906
1907         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1908         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1909         return 0;
1910 }
1911
1912 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1913 {
1914         struct snd_soc_dpcm *dpcm;
1915
1916         /* only hw_params backends that are either sinks or sources
1917          * to this frontend DAI */
1918         for_each_dpcm_be(fe, stream, dpcm) {
1919
1920                 struct snd_soc_pcm_runtime *be = dpcm->be;
1921                 struct snd_pcm_substream *be_substream =
1922                         snd_soc_dpcm_get_substream(be, stream);
1923
1924                 /* is this op for this BE ? */
1925                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1926                         continue;
1927
1928                 /* only free hw when no longer used - check all FEs */
1929                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1930                                 continue;
1931
1932                 /* do not free hw if this BE is used by other FE */
1933                 if (be->dpcm[stream].users > 1)
1934                         continue;
1935
1936                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1937                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1938                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1939                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1940                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1941                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1942                         continue;
1943
1944                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1945                         be->dai_link->name);
1946
1947                 __soc_pcm_hw_free(be, be_substream);
1948
1949                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1950         }
1951 }
1952
1953 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1954 {
1955         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1956         int stream = substream->stream;
1957
1958         snd_soc_dpcm_mutex_lock(fe);
1959         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1960
1961         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1962
1963         /* call hw_free on the frontend */
1964         soc_pcm_hw_clean(fe, substream, 0);
1965
1966         /* only hw_params backends that are either sinks or sources
1967          * to this frontend DAI */
1968         dpcm_be_dai_hw_free(fe, stream);
1969
1970         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1971         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1972
1973         snd_soc_dpcm_mutex_unlock(fe);
1974         return 0;
1975 }
1976
1977 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1978 {
1979         struct snd_soc_pcm_runtime *be;
1980         struct snd_pcm_substream *be_substream;
1981         struct snd_soc_dpcm *dpcm;
1982         int ret;
1983
1984         for_each_dpcm_be(fe, stream, dpcm) {
1985                 be = dpcm->be;
1986                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1987
1988                 /* is this op for this BE ? */
1989                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1990                         continue;
1991
1992                 /* copy params for each dpcm */
1993                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1994                                 sizeof(struct snd_pcm_hw_params));
1995
1996                 /* perform any hw_params fixups */
1997                 ret = snd_soc_link_be_hw_params_fixup(be, &dpcm->hw_params);
1998                 if (ret < 0)
1999                         goto unwind;
2000
2001                 /* copy the fixed-up hw params for BE dai */
2002                 memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
2003                        sizeof(struct snd_pcm_hw_params));
2004
2005                 /* only allow hw_params() if no connected FEs are running */
2006                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2007                         continue;
2008
2009                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2010                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2011                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2012                         continue;
2013
2014                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2015                         be->dai_link->name);
2016
2017                 ret = __soc_pcm_hw_params(be, be_substream, &dpcm->hw_params);
2018                 if (ret < 0)
2019                         goto unwind;
2020
2021                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2022         }
2023         return 0;
2024
2025 unwind:
2026         dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2027                 __func__, be->dai_link->name, ret);
2028
2029         /* disable any enabled and non active backends */
2030         for_each_dpcm_be_rollback(fe, stream, dpcm) {
2031                 be = dpcm->be;
2032                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2033
2034                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2035                         continue;
2036
2037                 /* only allow hw_free() if no connected FEs are running */
2038                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2039                         continue;
2040
2041                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2042                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2043                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2044                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2045                         continue;
2046
2047                 __soc_pcm_hw_free(be, be_substream);
2048         }
2049
2050         return ret;
2051 }
2052
2053 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2054                                  struct snd_pcm_hw_params *params)
2055 {
2056         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2057         int ret, stream = substream->stream;
2058
2059         snd_soc_dpcm_mutex_lock(fe);
2060         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2061
2062         memcpy(&fe->dpcm[stream].hw_params, params,
2063                         sizeof(struct snd_pcm_hw_params));
2064         ret = dpcm_be_dai_hw_params(fe, stream);
2065         if (ret < 0)
2066                 goto out;
2067
2068         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2069                         fe->dai_link->name, params_rate(params),
2070                         params_channels(params), params_format(params));
2071
2072         /* call hw_params on the frontend */
2073         ret = __soc_pcm_hw_params(fe, substream, params);
2074         if (ret < 0)
2075                 dpcm_be_dai_hw_free(fe, stream);
2076         else
2077                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2078
2079 out:
2080         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2081         snd_soc_dpcm_mutex_unlock(fe);
2082
2083         if (ret < 0)
2084                 dev_err(fe->dev, "ASoC: %s failed (%d)\n", __func__, ret);
2085
2086         return ret;
2087 }
2088
2089 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2090                                int cmd)
2091 {
2092         struct snd_soc_pcm_runtime *be;
2093         bool pause_stop_transition;
2094         struct snd_soc_dpcm *dpcm;
2095         unsigned long flags;
2096         int ret = 0;
2097
2098         for_each_dpcm_be(fe, stream, dpcm) {
2099                 struct snd_pcm_substream *be_substream;
2100
2101                 be = dpcm->be;
2102                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2103
2104                 snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
2105
2106                 /* is this op for this BE ? */
2107                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2108                         goto next;
2109
2110                 dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
2111                         be->dai_link->name, cmd);
2112
2113                 switch (cmd) {
2114                 case SNDRV_PCM_TRIGGER_START:
2115                         if (!be->dpcm[stream].be_start &&
2116                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2117                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2118                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2119                                 goto next;
2120
2121                         be->dpcm[stream].be_start++;
2122                         if (be->dpcm[stream].be_start != 1)
2123                                 goto next;
2124
2125                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
2126                                 ret = soc_pcm_trigger(be_substream,
2127                                                       SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
2128                         else
2129                                 ret = soc_pcm_trigger(be_substream,
2130                                                       SNDRV_PCM_TRIGGER_START);
2131
2132                         ret = soc_pcm_trigger(be_substream, cmd);
2133                         if (ret) {
2134                                 be->dpcm[stream].be_start--;
2135                                 goto next;
2136                         }
2137
2138                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2139                         break;
2140                 case SNDRV_PCM_TRIGGER_RESUME:
2141                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2142                                 goto next;
2143
2144                         be->dpcm[stream].be_start++;
2145                         if (be->dpcm[stream].be_start != 1)
2146                                 goto next;
2147
2148                         ret = soc_pcm_trigger(be_substream, cmd);
2149                         if (ret) {
2150                                 be->dpcm[stream].be_start--;
2151                                 goto next;
2152                         }
2153
2154                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2155                         break;
2156                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2157                         if (!be->dpcm[stream].be_start &&
2158                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2159                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2160                                 goto next;
2161
2162                         fe->dpcm[stream].fe_pause = false;
2163                         be->dpcm[stream].be_pause--;
2164
2165                         be->dpcm[stream].be_start++;
2166                         if (be->dpcm[stream].be_start != 1)
2167                                 goto next;
2168
2169                         ret = soc_pcm_trigger(be_substream, cmd);
2170                         if (ret) {
2171                                 be->dpcm[stream].be_start--;
2172                                 goto next;
2173                         }
2174
2175                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2176                         break;
2177                 case SNDRV_PCM_TRIGGER_STOP:
2178                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2179                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2180                                 goto next;
2181
2182                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2183                                 be->dpcm[stream].be_start--;
2184
2185                         if (be->dpcm[stream].be_start != 0)
2186                                 goto next;
2187
2188                         pause_stop_transition = false;
2189                         if (fe->dpcm[stream].fe_pause) {
2190                                 pause_stop_transition = true;
2191                                 fe->dpcm[stream].fe_pause = false;
2192                                 be->dpcm[stream].be_pause--;
2193                         }
2194
2195                         if (be->dpcm[stream].be_pause != 0)
2196                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
2197                         else
2198                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
2199
2200                         if (ret) {
2201                                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2202                                         be->dpcm[stream].be_start++;
2203                                 if (pause_stop_transition) {
2204                                         fe->dpcm[stream].fe_pause = true;
2205                                         be->dpcm[stream].be_pause++;
2206                                 }
2207                                 goto next;
2208                         }
2209
2210                         if (be->dpcm[stream].be_pause != 0)
2211                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2212                         else
2213                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2214
2215                         break;
2216                 case SNDRV_PCM_TRIGGER_SUSPEND:
2217                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2218                                 goto next;
2219
2220                         be->dpcm[stream].be_start--;
2221                         if (be->dpcm[stream].be_start != 0)
2222                                 goto next;
2223
2224                         ret = soc_pcm_trigger(be_substream, cmd);
2225                         if (ret) {
2226                                 be->dpcm[stream].be_start++;
2227                                 goto next;
2228                         }
2229
2230                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2231                         break;
2232                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2233                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2234                                 goto next;
2235
2236                         fe->dpcm[stream].fe_pause = true;
2237                         be->dpcm[stream].be_pause++;
2238
2239                         be->dpcm[stream].be_start--;
2240                         if (be->dpcm[stream].be_start != 0)
2241                                 goto next;
2242
2243                         ret = soc_pcm_trigger(be_substream, cmd);
2244                         if (ret) {
2245                                 be->dpcm[stream].be_start++;
2246                                 goto next;
2247                         }
2248
2249                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2250                         break;
2251                 }
2252 next:
2253                 snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
2254                 if (ret)
2255                         break;
2256         }
2257         if (ret < 0)
2258                 dev_err(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2259                         __func__, be->dai_link->name, ret);
2260         return ret;
2261 }
2262 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2263
2264 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2265                                   int cmd, bool fe_first)
2266 {
2267         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2268         int ret;
2269
2270         /* call trigger on the frontend before the backend. */
2271         if (fe_first) {
2272                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2273                         fe->dai_link->name, cmd);
2274
2275                 ret = soc_pcm_trigger(substream, cmd);
2276                 if (ret < 0)
2277                         return ret;
2278
2279                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2280                 return ret;
2281         }
2282
2283         /* call trigger on the frontend after the backend. */
2284         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2285         if (ret < 0)
2286                 return ret;
2287
2288         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2289                 fe->dai_link->name, cmd);
2290
2291         ret = soc_pcm_trigger(substream, cmd);
2292
2293         return ret;
2294 }
2295
2296 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2297 {
2298         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2299         int stream = substream->stream;
2300         int ret = 0;
2301         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2302
2303         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2304
2305         switch (trigger) {
2306         case SND_SOC_DPCM_TRIGGER_PRE:
2307                 switch (cmd) {
2308                 case SNDRV_PCM_TRIGGER_START:
2309                 case SNDRV_PCM_TRIGGER_RESUME:
2310                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2311                 case SNDRV_PCM_TRIGGER_DRAIN:
2312                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2313                         break;
2314                 case SNDRV_PCM_TRIGGER_STOP:
2315                 case SNDRV_PCM_TRIGGER_SUSPEND:
2316                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2317                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2318                         break;
2319                 default:
2320                         ret = -EINVAL;
2321                         break;
2322                 }
2323                 break;
2324         case SND_SOC_DPCM_TRIGGER_POST:
2325                 switch (cmd) {
2326                 case SNDRV_PCM_TRIGGER_START:
2327                 case SNDRV_PCM_TRIGGER_RESUME:
2328                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2329                 case SNDRV_PCM_TRIGGER_DRAIN:
2330                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2331                         break;
2332                 case SNDRV_PCM_TRIGGER_STOP:
2333                 case SNDRV_PCM_TRIGGER_SUSPEND:
2334                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2335                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2336                         break;
2337                 default:
2338                         ret = -EINVAL;
2339                         break;
2340                 }
2341                 break;
2342         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2343                 /* bespoke trigger() - handles both FE and BEs */
2344
2345                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2346                                 fe->dai_link->name, cmd);
2347
2348                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2349                 break;
2350         default:
2351                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2352                                 fe->dai_link->name);
2353                 ret = -EINVAL;
2354                 goto out;
2355         }
2356
2357         if (ret < 0) {
2358                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2359                         cmd, ret);
2360                 goto out;
2361         }
2362
2363         switch (cmd) {
2364         case SNDRV_PCM_TRIGGER_START:
2365         case SNDRV_PCM_TRIGGER_RESUME:
2366         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2367                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2368                 break;
2369         case SNDRV_PCM_TRIGGER_STOP:
2370         case SNDRV_PCM_TRIGGER_SUSPEND:
2371                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2372                 break;
2373         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2374                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2375                 break;
2376         }
2377
2378 out:
2379         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2380         return ret;
2381 }
2382
2383 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2384 {
2385         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2386         int stream = substream->stream;
2387
2388         /* if FE's runtime_update is already set, we're in race;
2389          * process this trigger later at exit
2390          */
2391         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2392                 fe->dpcm[stream].trigger_pending = cmd + 1;
2393                 return 0; /* delayed, assuming it's successful */
2394         }
2395
2396         /* we're alone, let's trigger */
2397         return dpcm_fe_dai_do_trigger(substream, cmd);
2398 }
2399
2400 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2401 {
2402         struct snd_soc_dpcm *dpcm;
2403         int ret = 0;
2404
2405         for_each_dpcm_be(fe, stream, dpcm) {
2406
2407                 struct snd_soc_pcm_runtime *be = dpcm->be;
2408                 struct snd_pcm_substream *be_substream =
2409                         snd_soc_dpcm_get_substream(be, stream);
2410
2411                 /* is this op for this BE ? */
2412                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2413                         continue;
2414
2415                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2416                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2417                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2418                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2419                         continue;
2420
2421                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2422                         be->dai_link->name);
2423
2424                 ret = __soc_pcm_prepare(be, be_substream);
2425                 if (ret < 0)
2426                         break;
2427
2428                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2429         }
2430
2431         if (ret < 0)
2432                 dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
2433
2434         return ret;
2435 }
2436
2437 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2438 {
2439         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2440         int stream = substream->stream, ret = 0;
2441
2442         snd_soc_dpcm_mutex_lock(fe);
2443
2444         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2445
2446         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2447
2448         /* there is no point preparing this FE if there are no BEs */
2449         if (list_empty(&fe->dpcm[stream].be_clients)) {
2450                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2451                                 fe->dai_link->name);
2452                 ret = -EINVAL;
2453                 goto out;
2454         }
2455
2456         ret = dpcm_be_dai_prepare(fe, stream);
2457         if (ret < 0)
2458                 goto out;
2459
2460         /* call prepare on the frontend */
2461         ret = __soc_pcm_prepare(fe, substream);
2462         if (ret < 0)
2463                 goto out;
2464
2465         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2466
2467 out:
2468         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2469         snd_soc_dpcm_mutex_unlock(fe);
2470
2471         if (ret < 0)
2472                 dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
2473
2474         return ret;
2475 }
2476
2477 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2478 {
2479         struct snd_pcm_substream *substream =
2480                 snd_soc_dpcm_get_substream(fe, stream);
2481         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2482         int err;
2483
2484         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2485                         stream ? "capture" : "playback", fe->dai_link->name);
2486
2487         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2488                 /* call bespoke trigger - FE takes care of all BE triggers */
2489                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2490                                 fe->dai_link->name);
2491
2492                 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2493         } else {
2494                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2495                         fe->dai_link->name);
2496
2497                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2498         }
2499
2500         dpcm_be_dai_hw_free(fe, stream);
2501
2502         dpcm_be_dai_shutdown(fe, stream);
2503
2504         /* run the stream event for each BE */
2505         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2506
2507         if (err < 0)
2508                 dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, err);
2509
2510         return err;
2511 }
2512
2513 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2514 {
2515         struct snd_pcm_substream *substream =
2516                 snd_soc_dpcm_get_substream(fe, stream);
2517         struct snd_soc_dpcm *dpcm;
2518         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2519         int ret = 0;
2520
2521         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2522                         stream ? "capture" : "playback", fe->dai_link->name);
2523
2524         /* Only start the BE if the FE is ready */
2525         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2526                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
2527                 dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
2528                         fe->dai_link->name, fe->dpcm[stream].state);
2529                 ret = -EINVAL;
2530                 goto disconnect;
2531         }
2532
2533         /* startup must always be called for new BEs */
2534         ret = dpcm_be_dai_startup(fe, stream);
2535         if (ret < 0)
2536                 goto disconnect;
2537
2538         /* keep going if FE state is > open */
2539         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2540                 return 0;
2541
2542         ret = dpcm_be_dai_hw_params(fe, stream);
2543         if (ret < 0)
2544                 goto close;
2545
2546         /* keep going if FE state is > hw_params */
2547         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2548                 return 0;
2549
2550         ret = dpcm_be_dai_prepare(fe, stream);
2551         if (ret < 0)
2552                 goto hw_free;
2553
2554         /* run the stream event for each BE */
2555         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2556
2557         /* keep going if FE state is > prepare */
2558         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2559                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2560                 return 0;
2561
2562         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2563                 /* call trigger on the frontend - FE takes care of all BE triggers */
2564                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2565                                 fe->dai_link->name);
2566
2567                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2568                 if (ret < 0)
2569                         goto hw_free;
2570         } else {
2571                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2572                         fe->dai_link->name);
2573
2574                 ret = dpcm_be_dai_trigger(fe, stream,
2575                                         SNDRV_PCM_TRIGGER_START);
2576                 if (ret < 0)
2577                         goto hw_free;
2578         }
2579
2580         return 0;
2581
2582 hw_free:
2583         dpcm_be_dai_hw_free(fe, stream);
2584 close:
2585         dpcm_be_dai_shutdown(fe, stream);
2586 disconnect:
2587         /* disconnect any pending BEs */
2588         for_each_dpcm_be(fe, stream, dpcm) {
2589                 struct snd_soc_pcm_runtime *be = dpcm->be;
2590
2591                 /* is this op for this BE ? */
2592                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2593                         continue;
2594
2595                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
2596                         be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
2597                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2598         }
2599
2600         if (ret < 0)
2601                 dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
2602
2603         return ret;
2604 }
2605
2606 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2607 {
2608         struct snd_soc_dapm_widget_list *list;
2609         int stream;
2610         int count, paths;
2611
2612         if (!fe->dai_link->dynamic)
2613                 return 0;
2614
2615         if (fe->num_cpus > 1) {
2616                 dev_err(fe->dev,
2617                         "%s doesn't support Multi CPU yet\n", __func__);
2618                 return -EINVAL;
2619         }
2620
2621         /* only check active links */
2622         if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
2623                 return 0;
2624
2625         /* DAPM sync will call this to update DSP paths */
2626         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2627                 new ? "new" : "old", fe->dai_link->name);
2628
2629         for_each_pcm_streams(stream) {
2630
2631                 /* skip if FE doesn't have playback/capture capability */
2632                 if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
2633                     !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
2634                         continue;
2635
2636                 /* skip if FE isn't currently playing/capturing */
2637                 if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
2638                     !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
2639                         continue;
2640
2641                 paths = dpcm_path_get(fe, stream, &list);
2642                 if (paths < 0)
2643                         return paths;
2644
2645                 /* update any playback/capture paths */
2646                 count = dpcm_process_paths(fe, stream, &list, new);
2647                 if (count) {
2648                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2649                         if (new)
2650                                 dpcm_run_update_startup(fe, stream);
2651                         else
2652                                 dpcm_run_update_shutdown(fe, stream);
2653                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2654
2655                         dpcm_clear_pending_state(fe, stream);
2656                         dpcm_be_disconnect(fe, stream);
2657                 }
2658
2659                 dpcm_path_put(&list);
2660         }
2661
2662         return 0;
2663 }
2664
2665 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2666  * any DAI links.
2667  */
2668 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2669 {
2670         struct snd_soc_pcm_runtime *fe;
2671         int ret = 0;
2672
2673         mutex_lock_nested(&card->pcm_mutex, card->pcm_subclass);
2674         /* shutdown all old paths first */
2675         for_each_card_rtds(card, fe) {
2676                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2677                 if (ret)
2678                         goto out;
2679         }
2680
2681         /* bring new paths up */
2682         for_each_card_rtds(card, fe) {
2683                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2684                 if (ret)
2685                         goto out;
2686         }
2687
2688 out:
2689         mutex_unlock(&card->pcm_mutex);
2690         return ret;
2691 }
2692 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2693
2694 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2695 {
2696         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2697         struct snd_soc_dpcm *dpcm;
2698         int stream = fe_substream->stream;
2699
2700         snd_soc_dpcm_mutex_assert_held(fe);
2701
2702         /* mark FE's links ready to prune */
2703         for_each_dpcm_be(fe, stream, dpcm)
2704                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2705
2706         dpcm_be_disconnect(fe, stream);
2707
2708         fe->dpcm[stream].runtime = NULL;
2709 }
2710
2711 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2712 {
2713         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2714         int ret;
2715
2716         snd_soc_dpcm_mutex_lock(fe);
2717         ret = dpcm_fe_dai_shutdown(fe_substream);
2718
2719         dpcm_fe_dai_cleanup(fe_substream);
2720
2721         snd_soc_dpcm_mutex_unlock(fe);
2722         return ret;
2723 }
2724
2725 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2726 {
2727         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2728         struct snd_soc_dapm_widget_list *list;
2729         int ret;
2730         int stream = fe_substream->stream;
2731
2732         snd_soc_dpcm_mutex_lock(fe);
2733         fe->dpcm[stream].runtime = fe_substream->runtime;
2734
2735         ret = dpcm_path_get(fe, stream, &list);
2736         if (ret < 0)
2737                 goto open_end;
2738
2739         /* calculate valid and active FE <-> BE dpcms */
2740         dpcm_process_paths(fe, stream, &list, 1);
2741
2742         ret = dpcm_fe_dai_startup(fe_substream);
2743         if (ret < 0)
2744                 dpcm_fe_dai_cleanup(fe_substream);
2745
2746         dpcm_clear_pending_state(fe, stream);
2747         dpcm_path_put(&list);
2748 open_end:
2749         snd_soc_dpcm_mutex_unlock(fe);
2750         return ret;
2751 }
2752
2753 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
2754                                     int *playback, int *capture)
2755 {
2756         struct snd_soc_dai *cpu_dai;
2757         int i;
2758
2759         if (rtd->dai_link->dynamic && rtd->num_cpus > 1) {
2760                 dev_err(rtd->dev,
2761                         "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2762                 return -EINVAL;
2763         }
2764
2765         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2766                 int stream;
2767
2768                 if (rtd->dai_link->dpcm_playback) {
2769                         stream = SNDRV_PCM_STREAM_PLAYBACK;
2770
2771                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2772                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2773                                         *playback = 1;
2774                                         break;
2775                                 }
2776                         }
2777                         if (!*playback) {
2778                                 dev_err(rtd->card->dev,
2779                                         "No CPU DAIs support playback for stream %s\n",
2780                                         rtd->dai_link->stream_name);
2781                                 return -EINVAL;
2782                         }
2783                 }
2784                 if (rtd->dai_link->dpcm_capture) {
2785                         stream = SNDRV_PCM_STREAM_CAPTURE;
2786
2787                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2788                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2789                                         *capture = 1;
2790                                         break;
2791                                 }
2792                         }
2793
2794                         if (!*capture) {
2795                                 dev_err(rtd->card->dev,
2796                                         "No CPU DAIs support capture for stream %s\n",
2797                                         rtd->dai_link->stream_name);
2798                                 return -EINVAL;
2799                         }
2800                 }
2801         } else {
2802                 struct snd_soc_dai *codec_dai;
2803
2804                 /* Adapt stream for codec2codec links */
2805                 int cpu_capture = rtd->dai_link->params ?
2806                         SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
2807                 int cpu_playback = rtd->dai_link->params ?
2808                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2809
2810                 for_each_rtd_codec_dais(rtd, i, codec_dai) {
2811                         if (rtd->num_cpus == 1) {
2812                                 cpu_dai = asoc_rtd_to_cpu(rtd, 0);
2813                         } else if (rtd->num_cpus == rtd->num_codecs) {
2814                                 cpu_dai = asoc_rtd_to_cpu(rtd, i);
2815                         } else {
2816                                 dev_err(rtd->card->dev,
2817                                         "N cpus to M codecs link is not supported yet\n");
2818                                 return -EINVAL;
2819                         }
2820
2821                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2822                             snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2823                                 *playback = 1;
2824                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2825                             snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2826                                 *capture = 1;
2827                 }
2828         }
2829
2830         if (rtd->dai_link->playback_only) {
2831                 *playback = 1;
2832                 *capture = 0;
2833         }
2834
2835         if (rtd->dai_link->capture_only) {
2836                 *playback = 0;
2837                 *capture = 1;
2838         }
2839
2840         return 0;
2841 }
2842
2843 static int soc_create_pcm(struct snd_pcm **pcm,
2844                           struct snd_soc_pcm_runtime *rtd,
2845                           int playback, int capture, int num)
2846 {
2847         char new_name[64];
2848         int ret;
2849
2850         /* create the PCM */
2851         if (rtd->dai_link->params) {
2852                 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2853                          rtd->dai_link->stream_name);
2854
2855                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2856                                            playback, capture, pcm);
2857         } else if (rtd->dai_link->no_pcm) {
2858                 snprintf(new_name, sizeof(new_name), "(%s)",
2859                         rtd->dai_link->stream_name);
2860
2861                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2862                                 playback, capture, pcm);
2863         } else {
2864                 if (rtd->dai_link->dynamic)
2865                         snprintf(new_name, sizeof(new_name), "%s (*)",
2866                                 rtd->dai_link->stream_name);
2867                 else
2868                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2869                                 rtd->dai_link->stream_name,
2870                                 soc_codec_dai_name(rtd), num);
2871
2872                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2873                         capture, pcm);
2874         }
2875         if (ret < 0) {
2876                 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2877                         new_name, rtd->dai_link->name, ret);
2878                 return ret;
2879         }
2880         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2881
2882         return 0;
2883 }
2884
2885 /* create a new pcm */
2886 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2887 {
2888         struct snd_soc_component *component;
2889         struct snd_pcm *pcm;
2890         int ret = 0, playback = 0, capture = 0;
2891         int i;
2892
2893         ret = soc_get_playback_capture(rtd, &playback, &capture);
2894         if (ret < 0)
2895                 return ret;
2896
2897         ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
2898         if (ret < 0)
2899                 return ret;
2900
2901         /* DAPM dai link stream work */
2902         if (rtd->dai_link->params)
2903                 rtd->close_delayed_work_func = codec2codec_close_delayed_work;
2904         else
2905                 rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2906
2907         rtd->pcm = pcm;
2908         pcm->nonatomic = rtd->dai_link->nonatomic;
2909         pcm->private_data = rtd;
2910
2911         if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
2912                 if (playback)
2913                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2914                 if (capture)
2915                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2916                 goto out;
2917         }
2918
2919         /* ASoC PCM operations */
2920         if (rtd->dai_link->dynamic) {
2921                 rtd->ops.open           = dpcm_fe_dai_open;
2922                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2923                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2924                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2925                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2926                 rtd->ops.close          = dpcm_fe_dai_close;
2927                 rtd->ops.pointer        = soc_pcm_pointer;
2928         } else {
2929                 rtd->ops.open           = soc_pcm_open;
2930                 rtd->ops.hw_params      = soc_pcm_hw_params;
2931                 rtd->ops.prepare        = soc_pcm_prepare;
2932                 rtd->ops.trigger        = soc_pcm_trigger;
2933                 rtd->ops.hw_free        = soc_pcm_hw_free;
2934                 rtd->ops.close          = soc_pcm_close;
2935                 rtd->ops.pointer        = soc_pcm_pointer;
2936         }
2937
2938         for_each_rtd_components(rtd, i, component) {
2939                 const struct snd_soc_component_driver *drv = component->driver;
2940
2941                 if (drv->ioctl)
2942                         rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2943                 if (drv->sync_stop)
2944                         rtd->ops.sync_stop      = snd_soc_pcm_component_sync_stop;
2945                 if (drv->copy_user)
2946                         rtd->ops.copy_user      = snd_soc_pcm_component_copy_user;
2947                 if (drv->page)
2948                         rtd->ops.page           = snd_soc_pcm_component_page;
2949                 if (drv->mmap)
2950                         rtd->ops.mmap           = snd_soc_pcm_component_mmap;
2951                 if (drv->ack)
2952                         rtd->ops.ack            = snd_soc_pcm_component_ack;
2953         }
2954
2955         if (playback)
2956                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2957
2958         if (capture)
2959                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2960
2961         ret = snd_soc_pcm_component_new(rtd);
2962         if (ret < 0)
2963                 return ret;
2964
2965         pcm->no_device_suspend = true;
2966 out:
2967         dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
2968                 soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
2969         return ret;
2970 }
2971
2972 /* is the current PCM operation for this FE ? */
2973 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2974 {
2975         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2976                 return 1;
2977         return 0;
2978 }
2979 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2980
2981 /* is the current PCM operation for this BE ? */
2982 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2983                 struct snd_soc_pcm_runtime *be, int stream)
2984 {
2985         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2986            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2987                   be->dpcm[stream].runtime_update))
2988                 return 1;
2989         return 0;
2990 }
2991 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2992
2993 /* get the substream for this BE */
2994 struct snd_pcm_substream *
2995         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2996 {
2997         return be->pcm->streams[stream].substream;
2998 }
2999 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
3000
3001 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
3002                                     struct snd_soc_pcm_runtime *be,
3003                                     int stream,
3004                                     const enum snd_soc_dpcm_state *states,
3005                                     int num_states)
3006 {
3007         struct snd_soc_dpcm *dpcm;
3008         int state;
3009         int ret = 1;
3010         int i;
3011
3012         for_each_dpcm_fe(be, stream, dpcm) {
3013
3014                 if (dpcm->fe == fe)
3015                         continue;
3016
3017                 state = dpcm->fe->dpcm[stream].state;
3018                 for (i = 0; i < num_states; i++) {
3019                         if (state == states[i]) {
3020                                 ret = 0;
3021                                 break;
3022                         }
3023                 }
3024         }
3025
3026         /* it's safe to do this BE DAI */
3027         return ret;
3028 }
3029
3030 /*
3031  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3032  * are not running, paused or suspended for the specified stream direction.
3033  */
3034 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3035                 struct snd_soc_pcm_runtime *be, int stream)
3036 {
3037         const enum snd_soc_dpcm_state state[] = {
3038                 SND_SOC_DPCM_STATE_START,
3039                 SND_SOC_DPCM_STATE_PAUSED,
3040                 SND_SOC_DPCM_STATE_SUSPEND,
3041         };
3042
3043         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3044 }
3045 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3046
3047 /*
3048  * We can only change hw params a BE DAI if any of it's FE are not prepared,
3049  * running, paused or suspended for the specified stream direction.
3050  */
3051 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3052                 struct snd_soc_pcm_runtime *be, int stream)
3053 {
3054         const enum snd_soc_dpcm_state state[] = {
3055                 SND_SOC_DPCM_STATE_START,
3056                 SND_SOC_DPCM_STATE_PAUSED,
3057                 SND_SOC_DPCM_STATE_SUSPEND,
3058                 SND_SOC_DPCM_STATE_PREPARE,
3059         };
3060
3061         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3062 }
3063 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);