sound/soc/soc-pcm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // soc-pcm.c  --  ALSA SoC PCM
   4 //
   5 // Copyright 2005 Wolfson Microelectronics PLC.
   6 // Copyright 2005 Openedhand Ltd.
   7 // Copyright (C) 2010 Slimlogic Ltd.
   8 // Copyright (C) 2010 Texas Instruments Inc.
   9 //
  10 // Authors: Liam Girdwood <lrg@ti.com>
  11 //          Mark Brown <broonie@opensource.wolfsonmicro.com>
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/delay.h>
  16 #include <linux/pinctrl/consumer.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/slab.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/export.h>
  21 #include <linux/debugfs.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/soc-dpcm.h>
  27 #include <sound/soc-link.h>
  28 #include <sound/initval.h>
  29
  30 #define soc_pcm_ret(rtd, ret) _soc_pcm_ret(rtd, __func__, ret)
  31 static inline int _soc_pcm_ret(struct snd_soc_pcm_runtime *rtd,
  32                                const char *func, int ret)
  33 {
  34         /* Positive, Zero values are not errors */
  35         if (ret >= 0)
  36                 return ret;
  37
  38         /* Negative values might be errors */
  39         switch (ret) {
  40         case -EPROBE_DEFER:
  41         case -ENOTSUPP:
  42                 break;
  43         default:
  44                 dev_err(rtd->dev,
  45                         "ASoC: error at %s on %s: %d\n",
  46                         func, rtd->dai_link->name, ret);
  47         }
  48
  49         return ret;
  50 }
  51
  52 static inline void snd_soc_dpcm_mutex_lock(struct snd_soc_pcm_runtime *rtd)
  53 {
  54         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
  55 }
  56
  57 static inline void snd_soc_dpcm_mutex_unlock(struct snd_soc_pcm_runtime *rtd)
  58 {
  59         mutex_unlock(&rtd->card->pcm_mutex);
  60 }
  61
  62 #define snd_soc_dpcm_mutex_assert_held(rtd) \
  63         lockdep_assert_held(&(rtd)->card->pcm_mutex)
  64
  65 static inline void snd_soc_dpcm_stream_lock_irq(struct snd_soc_pcm_runtime *rtd,
  66                                                 int stream)
  67 {
  68         snd_pcm_stream_lock_irq(snd_soc_dpcm_get_substream(rtd, stream));
  69 }
  70
  71 #define snd_soc_dpcm_stream_lock_irqsave_nested(rtd, stream, flags) \
  72         snd_pcm_stream_lock_irqsave_nested(snd_soc_dpcm_get_substream(rtd, stream), flags)
  73
  74 static inline void snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime *rtd,
  75                                                   int stream)
  76 {
  77         snd_pcm_stream_unlock_irq(snd_soc_dpcm_get_substream(rtd, stream));
  78 }
  79
  80 #define snd_soc_dpcm_stream_unlock_irqrestore(rtd, stream, flags) \
  81         snd_pcm_stream_unlock_irqrestore(snd_soc_dpcm_get_substream(rtd, stream), flags)
  82
  83 #define DPCM_MAX_BE_USERS       8
  84
  85 static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd)
  86 {
  87         return (rtd)->dai_link->num_cpus == 1 ? asoc_rtd_to_cpu(rtd, 0)->name : "multicpu";
  88 }
  89 static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd)
  90 {
  91         return (rtd)->dai_link->num_codecs == 1 ? asoc_rtd_to_codec(rtd, 0)->name : "multicodec";
  92 }
  93
  94 #ifdef CONFIG_DEBUG_FS
  95 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
  96 {
  97         switch (state) {
  98         case SND_SOC_DPCM_STATE_NEW:
  99                 return "new";
 100         case SND_SOC_DPCM_STATE_OPEN:
 101                 return "open";
 102         case SND_SOC_DPCM_STATE_HW_PARAMS:
 103                 return "hw_params";
 104         case SND_SOC_DPCM_STATE_PREPARE:
 105                 return "prepare";
 106         case SND_SOC_DPCM_STATE_START:
 107                 return "start";
 108         case SND_SOC_DPCM_STATE_STOP:
 109                 return "stop";
 110         case SND_SOC_DPCM_STATE_SUSPEND:
 111                 return "suspend";
 112         case SND_SOC_DPCM_STATE_PAUSED:
 113                 return "paused";
 114         case SND_SOC_DPCM_STATE_HW_FREE:
 115                 return "hw_free";
 116         case SND_SOC_DPCM_STATE_CLOSE:
 117                 return "close";
 118         }
 119
 120         return "unknown";
 121 }
 122
 123 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
 124                                int stream, char *buf, size_t size)
 125 {
 126         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
 127         struct snd_soc_dpcm *dpcm;
 128         ssize_t offset = 0;
 129
 130         /* FE state */
 131         offset += scnprintf(buf + offset, size - offset,
 132                            "[%s - %s]\n", fe->dai_link->name,
 133                            stream ? "Capture" : "Playback");
 134
 135         offset += scnprintf(buf + offset, size - offset, "State: %s\n",
 136                            dpcm_state_string(fe->dpcm[stream].state));
 137
 138         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
 139             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
 140                 offset += scnprintf(buf + offset, size - offset,
 141                                    "Hardware Params: "
 142                                    "Format = %s, Channels = %d, Rate = %d\n",
 143                                    snd_pcm_format_name(params_format(params)),
 144                                    params_channels(params),
 145                                    params_rate(params));
 146
 147         /* BEs state */
 148         offset += scnprintf(buf + offset, size - offset, "Backends:\n");
 149
 150         if (list_empty(&fe->dpcm[stream].be_clients)) {
 151                 offset += scnprintf(buf + offset, size - offset,
 152                                    " No active DSP links\n");
 153                 goto out;
 154         }
 155
 156         for_each_dpcm_be(fe, stream, dpcm) {
 157                 struct snd_soc_pcm_runtime *be = dpcm->be;
 158                 params = &dpcm->hw_params;
 159
 160                 offset += scnprintf(buf + offset, size - offset,
 161                                    "- %s\n", be->dai_link->name);
 162
 163                 offset += scnprintf(buf + offset, size - offset,
 164                                    "   State: %s\n",
 165                                    dpcm_state_string(be->dpcm[stream].state));
 166
 167                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
 168                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
 169                         offset += scnprintf(buf + offset, size - offset,
 170                                            "   Hardware Params: "
 171                                            "Format = %s, Channels = %d, Rate = %d\n",
 172                                            snd_pcm_format_name(params_format(params)),
 173                                            params_channels(params),
 174                                            params_rate(params));
 175         }
 176 out:
 177         return offset;
 178 }
 179
 180 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
 181                                     size_t count, loff_t *ppos)
 182 {
 183         struct snd_soc_pcm_runtime *fe = file->private_data;
 184         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
 185         int stream;
 186         char *buf;
 187
 188         if (fe->dai_link->num_cpus > 1) {
 189                 dev_err(fe->dev,
 190                         "%s doesn't support Multi CPU yet\n", __func__);
 191                 return -EINVAL;
 192         }
 193
 194         buf = kmalloc(out_count, GFP_KERNEL);
 195         if (!buf)
 196                 return -ENOMEM;
 197
 198         snd_soc_dpcm_mutex_lock(fe);
 199         for_each_pcm_streams(stream)
 200                 if (snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream))
 201                         offset += dpcm_show_state(fe, stream,
 202                                                   buf + offset,
 203                                                   out_count - offset);
 204         snd_soc_dpcm_mutex_unlock(fe);
 205
 206         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
 207
 208         kfree(buf);
 209         return ret;
 210 }
 211
 212 static const struct file_operations dpcm_state_fops = {
 213         .open = simple_open,
 214         .read = dpcm_state_read_file,
 215         .llseek = default_llseek,
 216 };
 217
 218 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
 219 {
 220         if (!rtd->dai_link->dynamic)
 221                 return;
 222
 223         if (!rtd->card->debugfs_card_root)
 224                 return;
 225
 226         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
 227                                                     rtd->card->debugfs_card_root);
 228
 229         debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
 230                             rtd, &dpcm_state_fops);
 231 }
 232
 233 static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream)
 234 {
 235         char *name;
 236
 237         name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name,
 238                          stream ? "capture" : "playback");
 239         if (name) {
 240                 dpcm->debugfs_state = debugfs_create_dir(
 241                         name, dpcm->fe->debugfs_dpcm_root);
 242                 debugfs_create_u32("state", 0644, dpcm->debugfs_state,
 243                                    &dpcm->state);
 244                 kfree(name);
 245         }
 246 }
 247
 248 static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 249 {
 250         debugfs_remove_recursive(dpcm->debugfs_state);
 251 }
 252
 253 #else
 254 static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
 255                                              int stream)
 256 {
 257 }
 258
 259 static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 260 {
 261 }
 262 #endif
 263
 264 /* Set FE's runtime_update state; the state is protected via PCM stream lock
 265  * for avoiding the race with trigger callback.
 266  * If the state is unset and a trigger is pending while the previous operation,
 267  * process the pending trigger action here.
 268  */
 269 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
 270 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
 271                                      int stream, enum snd_soc_dpcm_update state)
 272 {
 273         struct snd_pcm_substream *substream =
 274                 snd_soc_dpcm_get_substream(fe, stream);
 275
 276         snd_soc_dpcm_stream_lock_irq(fe, stream);
 277         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
 278                 dpcm_fe_dai_do_trigger(substream,
 279                                        fe->dpcm[stream].trigger_pending - 1);
 280                 fe->dpcm[stream].trigger_pending = 0;
 281         }
 282         fe->dpcm[stream].runtime_update = state;
 283         snd_soc_dpcm_stream_unlock_irq(fe, stream);
 284 }
 285
 286 static void dpcm_set_be_update_state(struct snd_soc_pcm_runtime *be,
 287                                      int stream, enum snd_soc_dpcm_update state)
 288 {
 289         be->dpcm[stream].runtime_update = state;
 290 }
 291
 292 /**
 293  * snd_soc_runtime_action() - Increment/Decrement active count for
 294  * PCM runtime components
 295  * @rtd: ASoC PCM runtime that is activated
 296  * @stream: Direction of the PCM stream
 297  * @action: Activate stream if 1. Deactivate if -1.
 298  *
 299  * Increments/Decrements the active count for all the DAIs and components
 300  * attached to a PCM runtime.
 301  * Should typically be called when a stream is opened.
 302  *
 303  * Must be called with the rtd->card->pcm_mutex being held
 304  */
 305 void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
 306                             int stream, int action)
 307 {
 308         struct snd_soc_dai *dai;
 309         int i;
 310
 311         snd_soc_dpcm_mutex_assert_held(rtd);
 312
 313         for_each_rtd_dais(rtd, i, dai)
 314                 snd_soc_dai_action(dai, stream, action);
 315 }
 316 EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
 317
 318 /**
 319  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 320  * @rtd: The ASoC PCM runtime that should be checked.
 321  *
 322  * This function checks whether the power down delay should be ignored for a
 323  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 324  * been configured to ignore the delay, or if none of the components benefits
 325  * from having the delay.
 326  */
 327 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 328 {
 329         struct snd_soc_component *component;
 330         bool ignore = true;
 331         int i;
 332
 333         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 334                 return true;
 335
 336         for_each_rtd_components(rtd, i, component)
 337                 ignore &= !component->driver->use_pmdown_time;
 338
 339         return ignore;
 340 }
 341
 342 /**
 343  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 344  * @substream: the pcm substream
 345  * @hw: the hardware parameters
 346  *
 347  * Sets the substream runtime hardware parameters.
 348  */
 349 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 350         const struct snd_pcm_hardware *hw)
 351 {
 352         substream->runtime->hw = *hw;
 353
 354         return 0;
 355 }
 356 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 357
 358 /* DPCM stream event, send event to FE and all active BEs. */
 359 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 360         int event)
 361 {
 362         struct snd_soc_dpcm *dpcm;
 363
 364         snd_soc_dpcm_mutex_assert_held(fe);
 365
 366         for_each_dpcm_be(fe, dir, dpcm) {
 367
 368                 struct snd_soc_pcm_runtime *be = dpcm->be;
 369
 370                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 371                                 be->dai_link->name, event, dir);
 372
 373                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
 374                     (be->dpcm[dir].users >= 1))
 375                         continue;
 376
 377                 snd_soc_dapm_stream_event(be, dir, event);
 378         }
 379
 380         snd_soc_dapm_stream_event(fe, dir, event);
 381
 382         return 0;
 383 }
 384
 385 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
 386                                    struct snd_pcm_hw_params *params)
 387 {
 388         if (params) {
 389                 dai->rate        = params_rate(params);
 390                 dai->channels    = params_channels(params);
 391                 dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
 392         } else {
 393                 dai->rate        = 0;
 394                 dai->channels    = 0;
 395                 dai->sample_bits = 0;
 396         }
 397 }
 398
 399 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 400                                         struct snd_soc_dai *soc_dai)
 401 {
 402         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 403         int ret;
 404
 405         if (!snd_soc_dai_active(soc_dai))
 406                 return 0;
 407
 408 #define __soc_pcm_apply_symmetry(name, NAME)                            \
 409         if (soc_dai->name && (soc_dai->driver->symmetric_##name ||      \
 410                               rtd->dai_link->symmetric_##name)) {       \
 411                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
 412                         #name, soc_dai->name);                          \
 413                                                                         \
 414                 ret = snd_pcm_hw_constraint_single(substream->runtime,  \
 415                                                    SNDRV_PCM_HW_PARAM_##NAME,\
 416                                                    soc_dai->name);      \
 417                 if (ret < 0) {                                          \
 418                         dev_err(soc_dai->dev,                           \
 419                                 "ASoC: Unable to apply %s constraint: %d\n",\
 420                                 #name, ret);                            \
 421                         return ret;                                     \
 422                 }                                                       \
 423         }
 424
 425         __soc_pcm_apply_symmetry(rate,          RATE);
 426         __soc_pcm_apply_symmetry(channels,      CHANNELS);
 427         __soc_pcm_apply_symmetry(sample_bits,   SAMPLE_BITS);
 428
 429         return 0;
 430 }
 431
 432 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 433                                 struct snd_pcm_hw_params *params)
 434 {
 435         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 436         struct snd_soc_dai d;
 437         struct snd_soc_dai *dai;
 438         struct snd_soc_dai *cpu_dai;
 439         unsigned int symmetry, i;
 440
 441         d.name = __func__;
 442         soc_pcm_set_dai_params(&d, params);
 443
 444 #define __soc_pcm_params_symmetry(xxx)                                  \
 445         symmetry = rtd->dai_link->symmetric_##xxx;                      \
 446         for_each_rtd_dais(rtd, i, dai)                                  \
 447                 symmetry |= dai->driver->symmetric_##xxx;               \
 448                                                                         \
 449         if (symmetry)                                                   \
 450                 for_each_rtd_cpu_dais(rtd, i, cpu_dai)                  \
 451                         if (!snd_soc_dai_is_dummy(cpu_dai) &&           \
 452                             cpu_dai->xxx && cpu_dai->xxx != d.xxx) {    \
 453                                 dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
 454                                         #xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
 455                                 return -EINVAL;                         \
 456                         }
 457
 458         /* reject unmatched parameters when applying symmetry */
 459         __soc_pcm_params_symmetry(rate);
 460         __soc_pcm_params_symmetry(channels);
 461         __soc_pcm_params_symmetry(sample_bits);
 462
 463         return 0;
 464 }
 465
 466 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
 467 {
 468         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 469         struct snd_soc_dai_link *link = rtd->dai_link;
 470         struct snd_soc_dai *dai;
 471         unsigned int symmetry, i;
 472
 473         symmetry = link->symmetric_rate ||
 474                 link->symmetric_channels ||
 475                 link->symmetric_sample_bits;
 476
 477         for_each_rtd_dais(rtd, i, dai)
 478                 symmetry = symmetry ||
 479                         dai->driver->symmetric_rate ||
 480                         dai->driver->symmetric_channels ||
 481                         dai->driver->symmetric_sample_bits;
 482
 483         if (symmetry)
 484                 substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 485 }
 486
 487 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 488 {
 489         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 490         int ret;
 491
 492         if (!bits)
 493                 return;
 494
 495         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 496         if (ret != 0)
 497                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 498                                  bits, ret);
 499 }
 500
 501 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 502 {
 503         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 504         struct snd_soc_dai *cpu_dai;
 505         struct snd_soc_dai *codec_dai;
 506         int stream = substream->stream;
 507         int i;
 508         unsigned int bits = 0, cpu_bits = 0;
 509
 510         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 511                 struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 512
 513                 if (pcm_codec->sig_bits == 0) {
 514                         bits = 0;
 515                         break;
 516                 }
 517                 bits = max(pcm_codec->sig_bits, bits);
 518         }
 519
 520         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 521                 struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 522
 523                 if (pcm_cpu->sig_bits == 0) {
 524                         cpu_bits = 0;
 525                         break;
 526                 }
 527                 cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
 528         }
 529
 530         soc_pcm_set_msb(substream, bits);
 531         soc_pcm_set_msb(substream, cpu_bits);
 532 }
 533
 534 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
 535 {
 536         hw->rates               = UINT_MAX;
 537         hw->rate_min            = 0;
 538         hw->rate_max            = UINT_MAX;
 539         hw->channels_min        = 0;
 540         hw->channels_max        = UINT_MAX;
 541         hw->formats             = ULLONG_MAX;
 542 }
 543
 544 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
 545                                    struct snd_soc_pcm_stream *p)
 546 {
 547         hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
 548
 549         /* setup hw->rate_min/max via hw->rates first */
 550         snd_pcm_hw_limit_rates(hw);
 551
 552         /* update hw->rate_min/max by snd_soc_pcm_stream */
 553         hw->rate_min = max(hw->rate_min, p->rate_min);
 554         hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
 555 }
 556
 557 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
 558                                    struct snd_soc_pcm_stream *p)
 559 {
 560         hw->channels_min = max(hw->channels_min, p->channels_min);
 561         hw->channels_max = min(hw->channels_max, p->channels_max);
 562 }
 563
 564 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
 565                                      struct snd_soc_pcm_stream *p)
 566 {
 567         hw->formats &= p->formats;
 568 }
 569
 570 /**
 571  * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
 572  * @rtd: ASoC PCM runtime
 573  * @hw: PCM hardware parameters (output)
 574  * @stream: Direction of the PCM stream
 575  *
 576  * Calculates the subset of stream parameters supported by all DAIs
 577  * associated with the PCM stream.
 578  */
 579 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
 580                             struct snd_pcm_hardware *hw, int stream)
 581 {
 582         struct snd_soc_dai *codec_dai;
 583         struct snd_soc_dai *cpu_dai;
 584         struct snd_soc_pcm_stream *codec_stream;
 585         struct snd_soc_pcm_stream *cpu_stream;
 586         unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
 587         int i;
 588
 589         soc_pcm_hw_init(hw);
 590
 591         /* first calculate min/max only for CPUs in the DAI link */
 592         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 593
 594                 /*
 595                  * Skip CPUs which don't support the current stream type.
 596                  * Otherwise, since the rate, channel, and format values will
 597                  * zero in that case, we would have no usable settings left,
 598                  * causing the resulting setup to fail.
 599                  */
 600                 if (!snd_soc_dai_stream_valid(cpu_dai, stream))
 601                         continue;
 602
 603                 cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 604
 605                 soc_pcm_hw_update_chan(hw, cpu_stream);
 606                 soc_pcm_hw_update_rate(hw, cpu_stream);
 607                 soc_pcm_hw_update_format(hw, cpu_stream);
 608         }
 609         cpu_chan_min = hw->channels_min;
 610         cpu_chan_max = hw->channels_max;
 611
 612         /* second calculate min/max only for CODECs in the DAI link */
 613         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 614
 615                 /*
 616                  * Skip CODECs which don't support the current stream type.
 617                  * Otherwise, since the rate, channel, and format values will
 618                  * zero in that case, we would have no usable settings left,
 619                  * causing the resulting setup to fail.
 620                  */
 621                 if (!snd_soc_dai_stream_valid(codec_dai, stream))
 622                         continue;
 623
 624                 codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 625
 626                 soc_pcm_hw_update_chan(hw, codec_stream);
 627                 soc_pcm_hw_update_rate(hw, codec_stream);
 628                 soc_pcm_hw_update_format(hw, codec_stream);
 629         }
 630
 631         /* Verify both a valid CPU DAI and a valid CODEC DAI were found */
 632         if (!hw->channels_min)
 633                 return -EINVAL;
 634
 635         /*
 636          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 637          * connected to CPU DAI(s), use CPU DAI's directly and let
 638          * channel allocation be fixed up later
 639          */
 640         if (rtd->dai_link->num_codecs > 1) {
 641                 hw->channels_min = cpu_chan_min;
 642                 hw->channels_max = cpu_chan_max;
 643         }
 644
 645         return 0;
 646 }
 647 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
 648
 649 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 650 {
 651         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 652         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 653         u64 formats = hw->formats;
 654
 655         /*
 656          * At least one CPU and one CODEC should match. Otherwise, we should
 657          * have bailed out on a higher level, since there would be no CPU or
 658          * CODEC to support the transfer direction in that case.
 659          */
 660         snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
 661
 662         if (formats)
 663                 hw->formats &= formats;
 664 }
 665
 666 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
 667 {
 668         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 669         struct snd_soc_component *component;
 670         int i, ret = 0;
 671
 672         for_each_rtd_components(rtd, i, component) {
 673                 ret = snd_soc_component_module_get_when_open(component, substream);
 674                 if (ret < 0)
 675                         break;
 676
 677                 ret = snd_soc_component_open(component, substream);
 678                 if (ret < 0)
 679                         break;
 680         }
 681
 682         return ret;
 683 }
 684
 685 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
 686                                     int rollback)
 687 {
 688         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 689         struct snd_soc_component *component;
 690         int i, ret = 0;
 691
 692         for_each_rtd_components(rtd, i, component) {
 693                 int r = snd_soc_component_close(component, substream, rollback);
 694                 if (r < 0)
 695                         ret = r; /* use last ret */
 696
 697                 snd_soc_component_module_put_when_close(component, substream, rollback);
 698         }
 699
 700         return ret;
 701 }
 702
 703 static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
 704                          struct snd_pcm_substream *substream, int rollback)
 705 {
 706         struct snd_soc_component *component;
 707         struct snd_soc_dai *dai;
 708         int i;
 709
 710         snd_soc_dpcm_mutex_assert_held(rtd);
 711
 712         if (!rollback)
 713                 snd_soc_runtime_deactivate(rtd, substream->stream);
 714
 715         for_each_rtd_dais(rtd, i, dai)
 716                 snd_soc_dai_shutdown(dai, substream, rollback);
 717
 718         snd_soc_link_shutdown(substream, rollback);
 719
 720         soc_pcm_components_close(substream, rollback);
 721
 722         snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
 723
 724         for_each_rtd_components(rtd, i, component)
 725                 if (!snd_soc_component_active(component))
 726                         pinctrl_pm_select_sleep_state(component->dev);
 727
 728         return 0;
 729 }
 730
 731 /*
 732  * Called by ALSA when a PCM substream is closed. Private data can be
 733  * freed here. The cpu DAI, codec DAI, machine and components are also
 734  * shutdown.
 735  */
 736 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
 737                            struct snd_pcm_substream *substream)
 738 {
 739         return soc_pcm_clean(rtd, substream, 0);
 740 }
 741
 742 /* PCM close ops for non-DPCM streams */
 743 static int soc_pcm_close(struct snd_pcm_substream *substream)
 744 {
 745         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 746
 747         snd_soc_dpcm_mutex_lock(rtd);
 748         __soc_pcm_close(rtd, substream);
 749         snd_soc_dpcm_mutex_unlock(rtd);
 750         return 0;
 751 }
 752
 753 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
 754 {
 755         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 756         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 757         const char *name_cpu = soc_cpu_dai_name(rtd);
 758         const char *name_codec = soc_codec_dai_name(rtd);
 759         const char *err_msg;
 760         struct device *dev = rtd->dev;
 761
 762         err_msg = "rates";
 763         if (!hw->rates)
 764                 goto config_err;
 765
 766         err_msg = "formats";
 767         if (!hw->formats)
 768                 goto config_err;
 769
 770         err_msg = "channels";
 771         if (!hw->channels_min || !hw->channels_max ||
 772              hw->channels_min  >  hw->channels_max)
 773                 goto config_err;
 774
 775         dev_dbg(dev, "ASoC: %s <-> %s info:\n",         name_codec,
 776                                                         name_cpu);
 777         dev_dbg(dev, "ASoC: rate mask 0x%x\n",          hw->rates);
 778         dev_dbg(dev, "ASoC: ch   min %d max %d\n",      hw->channels_min,
 779                                                         hw->channels_max);
 780         dev_dbg(dev, "ASoC: rate min %d max %d\n",      hw->rate_min,
 781                                                         hw->rate_max);
 782
 783         return 0;
 784
 785 config_err:
 786         dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
 787                 name_codec, name_cpu, err_msg);
 788         return -EINVAL;
 789 }
 790
 791 /*
 792  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 793  * then initialized and any private data can be allocated. This also calls
 794  * startup for the cpu DAI, component, machine and codec DAI.
 795  */
 796 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
 797                           struct snd_pcm_substream *substream)
 798 {
 799         struct snd_soc_component *component;
 800         struct snd_soc_dai *dai;
 801         int i, ret = 0;
 802
 803         snd_soc_dpcm_mutex_assert_held(rtd);
 804
 805         for_each_rtd_components(rtd, i, component)
 806                 pinctrl_pm_select_default_state(component->dev);
 807
 808         ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
 809         if (ret < 0)
 810                 goto err;
 811
 812         ret = soc_pcm_components_open(substream);
 813         if (ret < 0)
 814                 goto err;
 815
 816         ret = snd_soc_link_startup(substream);
 817         if (ret < 0)
 818                 goto err;
 819
 820         /* startup the audio subsystem */
 821         for_each_rtd_dais(rtd, i, dai) {
 822                 ret = snd_soc_dai_startup(dai, substream);
 823                 if (ret < 0)
 824                         goto err;
 825         }
 826
 827         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 828         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 829                 goto dynamic;
 830
 831         /* Check that the codec and cpu DAIs are compatible */
 832         soc_pcm_init_runtime_hw(substream);
 833
 834         soc_pcm_update_symmetry(substream);
 835
 836         ret = soc_hw_sanity_check(substream);
 837         if (ret < 0)
 838                 goto err;
 839
 840         soc_pcm_apply_msb(substream);
 841
 842         /* Symmetry only applies if we've already got an active stream. */
 843         for_each_rtd_dais(rtd, i, dai) {
 844                 ret = soc_pcm_apply_symmetry(substream, dai);
 845                 if (ret != 0)
 846                         goto err;
 847         }
 848 dynamic:
 849         snd_soc_runtime_activate(rtd, substream->stream);
 850         ret = 0;
 851 err:
 852         if (ret < 0)
 853                 soc_pcm_clean(rtd, substream, 1);
 854
 855         return soc_pcm_ret(rtd, ret);
 856 }
 857
 858 /* PCM open ops for non-DPCM streams */
 859 static int soc_pcm_open(struct snd_pcm_substream *substream)
 860 {
 861         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 862         int ret;
 863
 864         snd_soc_dpcm_mutex_lock(rtd);
 865         ret = __soc_pcm_open(rtd, substream);
 866         snd_soc_dpcm_mutex_unlock(rtd);
 867         return ret;
 868 }
 869
 870 /*
 871  * Called by ALSA when the PCM substream is prepared, can set format, sample
 872  * rate, etc.  This function is non atomic and can be called multiple times,
 873  * it can refer to the runtime info.
 874  */
 875 static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
 876                              struct snd_pcm_substream *substream)
 877 {
 878         struct snd_soc_dai *dai;
 879         int i, ret = 0;
 880
 881         snd_soc_dpcm_mutex_assert_held(rtd);
 882
 883         ret = snd_soc_link_prepare(substream);
 884         if (ret < 0)
 885                 goto out;
 886
 887         ret = snd_soc_pcm_component_prepare(substream);
 888         if (ret < 0)
 889                 goto out;
 890
 891         ret = snd_soc_pcm_dai_prepare(substream);
 892         if (ret < 0)
 893                 goto out;
 894
 895         /* cancel any delayed stream shutdown that is pending */
 896         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 897             rtd->pop_wait) {
 898                 rtd->pop_wait = 0;
 899                 cancel_delayed_work(&rtd->delayed_work);
 900         }
 901
 902         snd_soc_dapm_stream_event(rtd, substream->stream,
 903                         SND_SOC_DAPM_STREAM_START);
 904
 905         for_each_rtd_dais(rtd, i, dai)
 906                 snd_soc_dai_digital_mute(dai, 0, substream->stream);
 907
 908 out:
 909         return soc_pcm_ret(rtd, ret);
 910 }
 911
 912 /* PCM prepare ops for non-DPCM streams */
 913 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 914 {
 915         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 916         int ret;
 917
 918         snd_soc_dpcm_mutex_lock(rtd);
 919         ret = __soc_pcm_prepare(rtd, substream);
 920         snd_soc_dpcm_mutex_unlock(rtd);
 921         return ret;
 922 }
 923
 924 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 925                                        unsigned int mask)
 926 {
 927         struct snd_interval *interval;
 928         int channels = hweight_long(mask);
 929
 930         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 931         interval->min = channels;
 932         interval->max = channels;
 933 }
 934
 935 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
 936                             struct snd_pcm_substream *substream, int rollback)
 937 {
 938         struct snd_soc_dai *dai;
 939         int i;
 940
 941         snd_soc_dpcm_mutex_assert_held(rtd);
 942
 943         /* clear the corresponding DAIs parameters when going to be inactive */
 944         for_each_rtd_dais(rtd, i, dai) {
 945                 if (snd_soc_dai_active(dai) == 1)
 946                         soc_pcm_set_dai_params(dai, NULL);
 947
 948                 if (snd_soc_dai_stream_active(dai, substream->stream) == 1)
 949                         snd_soc_dai_digital_mute(dai, 1, substream->stream);
 950         }
 951
 952         /* run the stream event */
 953         snd_soc_dapm_stream_stop(rtd, substream->stream);
 954
 955         /* free any machine hw params */
 956         snd_soc_link_hw_free(substream, rollback);
 957
 958         /* free any component resources */
 959         snd_soc_pcm_component_hw_free(substream, rollback);
 960
 961         /* now free hw params for the DAIs  */
 962         for_each_rtd_dais(rtd, i, dai)
 963                 if (snd_soc_dai_stream_valid(dai, substream->stream))
 964                         snd_soc_dai_hw_free(dai, substream, rollback);
 965
 966         return 0;
 967 }
 968
 969 /*
 970  * Frees resources allocated by hw_params, can be called multiple times
 971  */
 972 static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
 973                              struct snd_pcm_substream *substream)
 974 {
 975         return soc_pcm_hw_clean(rtd, substream, 0);
 976 }
 977
 978 /* hw_free PCM ops for non-DPCM streams */
 979 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 980 {
 981         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 982         int ret;
 983
 984         snd_soc_dpcm_mutex_lock(rtd);
 985         ret = __soc_pcm_hw_free(rtd, substream);
 986         snd_soc_dpcm_mutex_unlock(rtd);
 987         return ret;
 988 }
 989
 990 /*
 991  * Called by ALSA when the hardware params are set by application. This
 992  * function can also be called multiple times and can allocate buffers
 993  * (using snd_pcm_lib_* ). It's non-atomic.
 994  */
 995 static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
 996                                struct snd_pcm_substream *substream,
 997                                struct snd_pcm_hw_params *params)
 998 {
 999         struct snd_soc_dai *cpu_dai;
1000         struct snd_soc_dai *codec_dai;
1001         int i, ret = 0;
1002
1003         snd_soc_dpcm_mutex_assert_held(rtd);
1004
1005         ret = soc_pcm_params_symmetry(substream, params);
1006         if (ret)
1007                 goto out;
1008
1009         ret = snd_soc_link_hw_params(substream, params);
1010         if (ret < 0)
1011                 goto out;
1012
1013         for_each_rtd_codec_dais(rtd, i, codec_dai) {
1014                 struct snd_pcm_hw_params codec_params;
1015
1016                 /*
1017                  * Skip CODECs which don't support the current stream type,
1018                  * the idea being that if a CODEC is not used for the currently
1019                  * set up transfer direction, it should not need to be
1020                  * configured, especially since the configuration used might
1021                  * not even be supported by that CODEC. There may be cases
1022                  * however where a CODEC needs to be set up although it is
1023                  * actually not being used for the transfer, e.g. if a
1024                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
1025                  * for the DAI link including a playback-only CODEC.
1026                  * If this becomes necessary, we will have to augment the
1027                  * machine driver setup with information on how to act, so
1028                  * we can do the right thing here.
1029                  */
1030                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1031                         continue;
1032
1033                 /* copy params for each codec */
1034                 codec_params = *params;
1035
1036                 /* fixup params based on TDM slot masks */
1037                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1038                     codec_dai->tx_mask)
1039                         soc_pcm_codec_params_fixup(&codec_params,
1040                                                    codec_dai->tx_mask);
1041
1042                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
1043                     codec_dai->rx_mask)
1044                         soc_pcm_codec_params_fixup(&codec_params,
1045                                                    codec_dai->rx_mask);
1046
1047                 ret = snd_soc_dai_hw_params(codec_dai, substream,
1048                                             &codec_params);
1049                 if(ret < 0)
1050                         goto out;
1051
1052                 soc_pcm_set_dai_params(codec_dai, &codec_params);
1053                 snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
1054         }
1055
1056         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1057                 /*
1058                  * Skip CPUs which don't support the current stream
1059                  * type. See soc_pcm_init_runtime_hw() for more details
1060                  */
1061                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1062                         continue;
1063
1064                 ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
1065                 if (ret < 0)
1066                         goto out;
1067
1068                 /* store the parameters for each DAI */
1069                 soc_pcm_set_dai_params(cpu_dai, params);
1070                 snd_soc_dapm_update_dai(substream, params, cpu_dai);
1071         }
1072
1073         ret = snd_soc_pcm_component_hw_params(substream, params);
1074 out:
1075         if (ret < 0)
1076                 soc_pcm_hw_clean(rtd, substream, 1);
1077
1078         return soc_pcm_ret(rtd, 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_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n");
1213                 be_substream->pcm->nonatomic = 1;
1214         }
1215
1216         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1217         if (!dpcm)
1218                 return -ENOMEM;
1219
1220         dpcm->be = be;
1221         dpcm->fe = fe;
1222         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1223         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1224         snd_soc_dpcm_stream_lock_irq(fe, stream);
1225         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1226         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1227         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1228
1229         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1230                         stream ? "capture" : "playback",  fe->dai_link->name,
1231                         stream ? "<-" : "->", be->dai_link->name);
1232
1233         dpcm_create_debugfs_state(dpcm, stream);
1234
1235         return 1;
1236 }
1237
1238 /* reparent a BE onto another FE */
1239 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1240                         struct snd_soc_pcm_runtime *be, int stream)
1241 {
1242         struct snd_soc_dpcm *dpcm;
1243         struct snd_pcm_substream *fe_substream, *be_substream;
1244
1245         /* reparent if BE is connected to other FEs */
1246         if (!be->dpcm[stream].users)
1247                 return;
1248
1249         be_substream = snd_soc_dpcm_get_substream(be, stream);
1250         if (!be_substream)
1251                 return;
1252
1253         for_each_dpcm_fe(be, stream, dpcm) {
1254                 if (dpcm->fe == fe)
1255                         continue;
1256
1257                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1258                         stream ? "capture" : "playback",
1259                         dpcm->fe->dai_link->name,
1260                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1261
1262                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1263                 be_substream->runtime = fe_substream->runtime;
1264                 break;
1265         }
1266 }
1267
1268 /* disconnect a BE and FE */
1269 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1270 {
1271         struct snd_soc_dpcm *dpcm, *d;
1272         LIST_HEAD(deleted_dpcms);
1273
1274         snd_soc_dpcm_mutex_assert_held(fe);
1275
1276         snd_soc_dpcm_stream_lock_irq(fe, stream);
1277         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1278                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1279                                 stream ? "capture" : "playback",
1280                                 dpcm->be->dai_link->name);
1281
1282                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1283                         continue;
1284
1285                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1286                         stream ? "capture" : "playback", fe->dai_link->name,
1287                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1288
1289                 /* BEs still alive need new FE */
1290                 dpcm_be_reparent(fe, dpcm->be, stream);
1291
1292                 list_del(&dpcm->list_be);
1293                 list_move(&dpcm->list_fe, &deleted_dpcms);
1294         }
1295         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1296
1297         while (!list_empty(&deleted_dpcms)) {
1298                 dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
1299                                         list_fe);
1300                 list_del(&dpcm->list_fe);
1301                 dpcm_remove_debugfs_state(dpcm);
1302                 kfree(dpcm);
1303         }
1304 }
1305
1306 /* get BE for DAI widget and stream */
1307 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1308                 struct snd_soc_dapm_widget *widget, int stream)
1309 {
1310         struct snd_soc_pcm_runtime *be;
1311         struct snd_soc_dapm_widget *w;
1312         struct snd_soc_dai *dai;
1313         int i;
1314
1315         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1316
1317         for_each_card_rtds(card, be) {
1318
1319                 if (!be->dai_link->no_pcm)
1320                         continue;
1321
1322                 if (!snd_soc_dpcm_get_substream(be, stream))
1323                         continue;
1324
1325                 for_each_rtd_dais(be, i, dai) {
1326                         w = snd_soc_dai_get_widget(dai, stream);
1327
1328                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1329                                 w ? w->name : "(not set)");
1330
1331                         if (w == widget)
1332                                 return be;
1333                 }
1334         }
1335
1336         /* Widget provided is not a BE */
1337         return NULL;
1338 }
1339
1340 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1341                 struct snd_soc_dapm_widget *widget)
1342 {
1343         struct snd_soc_dapm_widget *w;
1344         int i;
1345
1346         for_each_dapm_widgets(list, i, w)
1347                 if (widget == w)
1348                         return 1;
1349
1350         return 0;
1351 }
1352
1353 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
1354 {
1355         struct snd_soc_card *card = widget->dapm->card;
1356         struct snd_soc_pcm_runtime *rtd;
1357         int stream;
1358
1359         /* adjust dir to stream */
1360         if (dir == SND_SOC_DAPM_DIR_OUT)
1361                 stream = SNDRV_PCM_STREAM_PLAYBACK;
1362         else
1363                 stream = SNDRV_PCM_STREAM_CAPTURE;
1364
1365         rtd = dpcm_get_be(card, widget, stream);
1366         if (rtd)
1367                 return true;
1368
1369         return false;
1370 }
1371 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
1372
1373 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1374         int stream, struct snd_soc_dapm_widget_list **list)
1375 {
1376         struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
1377         int paths;
1378
1379         if (fe->dai_link->num_cpus > 1) {
1380                 dev_err(fe->dev,
1381                         "%s doesn't support Multi CPU yet\n", __func__);
1382                 return -EINVAL;
1383         }
1384
1385         /* get number of valid DAI paths and their widgets */
1386         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1387                         fe->card->component_chaining ?
1388                                 NULL : dpcm_end_walk_at_be);
1389
1390         if (paths > 0)
1391                 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1392                         stream ? "capture" : "playback");
1393         else if (paths == 0)
1394                 dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
1395                          stream ? "capture" : "playback");
1396
1397         return paths;
1398 }
1399
1400 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1401 {
1402         snd_soc_dapm_dai_free_widgets(list);
1403 }
1404
1405 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1406                               struct snd_soc_dapm_widget_list *list)
1407 {
1408         struct snd_soc_dai *dai;
1409         unsigned int i;
1410
1411         /* is there a valid DAI widget for this BE */
1412         for_each_rtd_dais(dpcm->be, i, dai) {
1413                 struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
1414
1415                 /*
1416                  * The BE is pruned only if none of the dai
1417                  * widgets are in the active list.
1418                  */
1419                 if (widget && widget_in_list(list, widget))
1420                         return true;
1421         }
1422
1423         return false;
1424 }
1425
1426 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1427                             struct snd_soc_dapm_widget_list **list_)
1428 {
1429         struct snd_soc_dpcm *dpcm;
1430         int prune = 0;
1431
1432         /* Destroy any old FE <--> BE connections */
1433         for_each_dpcm_be(fe, stream, dpcm) {
1434                 if (dpcm_be_is_active(dpcm, stream, *list_))
1435                         continue;
1436
1437                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1438                         stream ? "capture" : "playback",
1439                         dpcm->be->dai_link->name, fe->dai_link->name);
1440                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1441                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
1442                 prune++;
1443         }
1444
1445         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1446         return prune;
1447 }
1448
1449 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1450         struct snd_soc_dapm_widget_list **list_)
1451 {
1452         struct snd_soc_card *card = fe->card;
1453         struct snd_soc_dapm_widget_list *list = *list_;
1454         struct snd_soc_pcm_runtime *be;
1455         struct snd_soc_dapm_widget *widget;
1456         int i, new = 0, err;
1457
1458         /* don't connect if FE is not running */
1459         if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1460                 return new;
1461
1462         /* Create any new FE <--> BE connections */
1463         for_each_dapm_widgets(list, i, widget) {
1464
1465                 switch (widget->id) {
1466                 case snd_soc_dapm_dai_in:
1467                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1468                                 continue;
1469                         break;
1470                 case snd_soc_dapm_dai_out:
1471                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1472                                 continue;
1473                         break;
1474                 default:
1475                         continue;
1476                 }
1477
1478                 /* is there a valid BE rtd for this widget */
1479                 be = dpcm_get_be(card, widget, stream);
1480                 if (!be) {
1481                         dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
1482                                 widget->name);
1483                         continue;
1484                 }
1485
1486                 /*
1487                  * Filter for systems with 'component_chaining' enabled.
1488                  * This helps to avoid unnecessary re-configuration of an
1489                  * already active BE on such systems.
1490                  */
1491                 if (fe->card->component_chaining &&
1492                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1493                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1494                         continue;
1495
1496                 /* newly connected FE and BE */
1497                 err = dpcm_be_connect(fe, be, stream);
1498                 if (err < 0) {
1499                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1500                                 widget->name);
1501                         break;
1502                 } else if (err == 0) /* already connected */
1503                         continue;
1504
1505                 /* new */
1506                 dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
1507                 new++;
1508         }
1509
1510         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1511         return new;
1512 }
1513
1514 /*
1515  * Find the corresponding BE DAIs that source or sink audio to this
1516  * FE substream.
1517  */
1518 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1519         int stream, struct snd_soc_dapm_widget_list **list, int new)
1520 {
1521         if (new)
1522                 return dpcm_add_paths(fe, stream, list);
1523         else
1524                 return dpcm_prune_paths(fe, stream, list);
1525 }
1526
1527 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1528 {
1529         struct snd_soc_dpcm *dpcm;
1530
1531         for_each_dpcm_be(fe, stream, dpcm)
1532                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
1533 }
1534
1535 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
1536                       int do_hw_free, struct snd_soc_dpcm *last)
1537 {
1538         struct snd_soc_dpcm *dpcm;
1539
1540         /* disable any enabled and non active backends */
1541         for_each_dpcm_be(fe, stream, dpcm) {
1542                 struct snd_soc_pcm_runtime *be = dpcm->be;
1543                 struct snd_pcm_substream *be_substream =
1544                         snd_soc_dpcm_get_substream(be, stream);
1545
1546                 if (dpcm == last)
1547                         return;
1548
1549                 /* is this op for this BE ? */
1550                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1551                         continue;
1552
1553                 if (be->dpcm[stream].users == 0) {
1554                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1555                                 stream ? "capture" : "playback",
1556                                 be->dpcm[stream].state);
1557                         continue;
1558                 }
1559
1560                 if (--be->dpcm[stream].users != 0)
1561                         continue;
1562
1563                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
1564                         if (!do_hw_free)
1565                                 continue;
1566
1567                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
1568                                 __soc_pcm_hw_free(be, be_substream);
1569                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1570                         }
1571                 }
1572
1573                 __soc_pcm_close(be, be_substream);
1574                 be_substream->runtime = NULL;
1575                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1576         }
1577 }
1578
1579 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1580 {
1581         struct snd_soc_pcm_runtime *be;
1582         struct snd_soc_dpcm *dpcm;
1583         int err, count = 0;
1584
1585         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1586         for_each_dpcm_be(fe, stream, dpcm) {
1587                 struct snd_pcm_substream *be_substream;
1588
1589                 be = dpcm->be;
1590                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1591
1592                 if (!be_substream) {
1593                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1594                                 stream ? "capture" : "playback");
1595                         continue;
1596                 }
1597
1598                 /* is this op for this BE ? */
1599                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1600                         continue;
1601
1602                 /* first time the dpcm is open ? */
1603                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
1604                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1605                                 stream ? "capture" : "playback",
1606                                 be->dpcm[stream].state);
1607                         continue;
1608                 }
1609
1610                 if (be->dpcm[stream].users++ != 0)
1611                         continue;
1612
1613                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1614                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1615                         continue;
1616
1617                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1618                         stream ? "capture" : "playback", be->dai_link->name);
1619
1620                 be_substream->runtime = be->dpcm[stream].runtime;
1621                 err = __soc_pcm_open(be, be_substream);
1622                 if (err < 0) {
1623                         be->dpcm[stream].users--;
1624                         if (be->dpcm[stream].users < 0)
1625                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1626                                         stream ? "capture" : "playback",
1627                                         be->dpcm[stream].state);
1628
1629                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1630                         goto unwind;
1631                 }
1632                 be->dpcm[stream].be_start = 0;
1633                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1634                 count++;
1635         }
1636
1637         return count;
1638
1639 unwind:
1640         dpcm_be_dai_startup_rollback(fe, stream, dpcm);
1641
1642         return soc_pcm_ret(fe, err);
1643 }
1644
1645 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
1646 {
1647         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1648         struct snd_pcm_runtime *runtime = substream->runtime;
1649         struct snd_pcm_hardware *hw = &runtime->hw;
1650         struct snd_soc_dai *dai;
1651         int stream = substream->stream;
1652         int i;
1653
1654         soc_pcm_hw_init(hw);
1655
1656         for_each_rtd_cpu_dais(fe, i, dai) {
1657                 struct snd_soc_pcm_stream *cpu_stream;
1658
1659                 /*
1660                  * Skip CPUs which don't support the current stream
1661                  * type. See soc_pcm_init_runtime_hw() for more details
1662                  */
1663                 if (!snd_soc_dai_stream_valid(dai, stream))
1664                         continue;
1665
1666                 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1667
1668                 soc_pcm_hw_update_rate(hw, cpu_stream);
1669                 soc_pcm_hw_update_chan(hw, cpu_stream);
1670                 soc_pcm_hw_update_format(hw, cpu_stream);
1671         }
1672
1673 }
1674
1675 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
1676 {
1677         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1678         struct snd_pcm_runtime *runtime = substream->runtime;
1679         struct snd_pcm_hardware *hw = &runtime->hw;
1680         struct snd_soc_dpcm *dpcm;
1681         struct snd_soc_dai *dai;
1682         int stream = substream->stream;
1683
1684         if (!fe->dai_link->dpcm_merged_format)
1685                 return;
1686
1687         /*
1688          * It returns merged BE codec format
1689          * if FE want to use it (= dpcm_merged_format)
1690          */
1691
1692         for_each_dpcm_be(fe, stream, dpcm) {
1693                 struct snd_soc_pcm_runtime *be = dpcm->be;
1694                 struct snd_soc_pcm_stream *codec_stream;
1695                 int i;
1696
1697                 for_each_rtd_codec_dais(be, i, dai) {
1698                         /*
1699                          * Skip CODECs which don't support the current stream
1700                          * type. See soc_pcm_init_runtime_hw() for more details
1701                          */
1702                         if (!snd_soc_dai_stream_valid(dai, stream))
1703                                 continue;
1704
1705                         codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1706
1707                         soc_pcm_hw_update_format(hw, codec_stream);
1708                 }
1709         }
1710 }
1711
1712 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
1713 {
1714         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1715         struct snd_pcm_runtime *runtime = substream->runtime;
1716         struct snd_pcm_hardware *hw = &runtime->hw;
1717         struct snd_soc_dpcm *dpcm;
1718         int stream = substream->stream;
1719
1720         if (!fe->dai_link->dpcm_merged_chan)
1721                 return;
1722
1723         /*
1724          * It returns merged BE codec channel;
1725          * if FE want to use it (= dpcm_merged_chan)
1726          */
1727
1728         for_each_dpcm_be(fe, stream, dpcm) {
1729                 struct snd_soc_pcm_runtime *be = dpcm->be;
1730                 struct snd_soc_pcm_stream *cpu_stream;
1731                 struct snd_soc_dai *dai;
1732                 int i;
1733
1734                 for_each_rtd_cpu_dais(be, i, dai) {
1735                         /*
1736                          * Skip CPUs which don't support the current stream
1737                          * type. See soc_pcm_init_runtime_hw() for more details
1738                          */
1739                         if (!snd_soc_dai_stream_valid(dai, stream))
1740                                 continue;
1741
1742                         cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1743
1744                         soc_pcm_hw_update_chan(hw, cpu_stream);
1745                 }
1746
1747                 /*
1748                  * chan min/max cannot be enforced if there are multiple CODEC
1749                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1750                  */
1751                 if (be->dai_link->num_codecs == 1) {
1752                         struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
1753                                 asoc_rtd_to_codec(be, 0), stream);
1754
1755                         soc_pcm_hw_update_chan(hw, codec_stream);
1756                 }
1757         }
1758 }
1759
1760 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
1761 {
1762         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1763         struct snd_pcm_runtime *runtime = substream->runtime;
1764         struct snd_pcm_hardware *hw = &runtime->hw;
1765         struct snd_soc_dpcm *dpcm;
1766         int stream = substream->stream;
1767
1768         if (!fe->dai_link->dpcm_merged_rate)
1769                 return;
1770
1771         /*
1772          * It returns merged BE codec channel;
1773          * if FE want to use it (= dpcm_merged_chan)
1774          */
1775
1776         for_each_dpcm_be(fe, stream, dpcm) {
1777                 struct snd_soc_pcm_runtime *be = dpcm->be;
1778                 struct snd_soc_pcm_stream *pcm;
1779                 struct snd_soc_dai *dai;
1780                 int i;
1781
1782                 for_each_rtd_dais(be, i, dai) {
1783                         /*
1784                          * Skip DAIs which don't support the current stream
1785                          * type. See soc_pcm_init_runtime_hw() for more details
1786                          */
1787                         if (!snd_soc_dai_stream_valid(dai, stream))
1788                                 continue;
1789
1790                         pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1791
1792                         soc_pcm_hw_update_rate(hw, pcm);
1793                 }
1794         }
1795 }
1796
1797 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1798                                int stream)
1799 {
1800         struct snd_soc_dpcm *dpcm;
1801         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1802         struct snd_soc_dai *fe_cpu_dai;
1803         int err = 0;
1804         int i;
1805
1806         /* apply symmetry for FE */
1807         soc_pcm_update_symmetry(fe_substream);
1808
1809         for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1810                 /* Symmetry only applies if we've got an active stream. */
1811                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1812                 if (err < 0)
1813                         goto error;
1814         }
1815
1816         /* apply symmetry for BE */
1817         for_each_dpcm_be(fe, stream, dpcm) {
1818                 struct snd_soc_pcm_runtime *be = dpcm->be;
1819                 struct snd_pcm_substream *be_substream =
1820                         snd_soc_dpcm_get_substream(be, stream);
1821                 struct snd_soc_pcm_runtime *rtd;
1822                 struct snd_soc_dai *dai;
1823
1824                 /* A backend may not have the requested substream */
1825                 if (!be_substream)
1826                         continue;
1827
1828                 rtd = asoc_substream_to_rtd(be_substream);
1829                 if (rtd->dai_link->be_hw_params_fixup)
1830                         continue;
1831
1832                 soc_pcm_update_symmetry(be_substream);
1833
1834                 /* Symmetry only applies if we've got an active stream. */
1835                 for_each_rtd_dais(rtd, i, dai) {
1836                         err = soc_pcm_apply_symmetry(fe_substream, dai);
1837                         if (err < 0)
1838                                 goto error;
1839                 }
1840         }
1841 error:
1842         return soc_pcm_ret(fe, err);
1843 }
1844
1845 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1846 {
1847         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1848         int stream = fe_substream->stream, ret = 0;
1849
1850         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1851
1852         ret = dpcm_be_dai_startup(fe, stream);
1853         if (ret < 0)
1854                 goto be_err;
1855
1856         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1857
1858         /* start the DAI frontend */
1859         ret = __soc_pcm_open(fe, fe_substream);
1860         if (ret < 0)
1861                 goto unwind;
1862
1863         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1864
1865         dpcm_runtime_setup_fe(fe_substream);
1866
1867         dpcm_runtime_setup_be_format(fe_substream);
1868         dpcm_runtime_setup_be_chan(fe_substream);
1869         dpcm_runtime_setup_be_rate(fe_substream);
1870
1871         ret = dpcm_apply_symmetry(fe_substream, stream);
1872
1873 unwind:
1874         if (ret < 0)
1875                 dpcm_be_dai_startup_unwind(fe, stream);
1876 be_err:
1877         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1878
1879         return soc_pcm_ret(fe, ret);
1880 }
1881
1882 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1883 {
1884         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1885         int stream = substream->stream;
1886
1887         snd_soc_dpcm_mutex_assert_held(fe);
1888
1889         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1890
1891         /* shutdown the BEs */
1892         dpcm_be_dai_shutdown(fe, stream);
1893
1894         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1895
1896         /* now shutdown the frontend */
1897         __soc_pcm_close(fe, substream);
1898
1899         /* run the stream stop event */
1900         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1901
1902         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1903         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1904         return 0;
1905 }
1906
1907 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1908 {
1909         struct snd_soc_dpcm *dpcm;
1910
1911         /* only hw_params backends that are either sinks or sources
1912          * to this frontend DAI */
1913         for_each_dpcm_be(fe, stream, dpcm) {
1914
1915                 struct snd_soc_pcm_runtime *be = dpcm->be;
1916                 struct snd_pcm_substream *be_substream =
1917                         snd_soc_dpcm_get_substream(be, stream);
1918
1919                 /* is this op for this BE ? */
1920                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1921                         continue;
1922
1923                 /* only free hw when no longer used - check all FEs */
1924                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1925                                 continue;
1926
1927                 /* do not free hw if this BE is used by other FE */
1928                 if (be->dpcm[stream].users > 1)
1929                         continue;
1930
1931                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1932                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1933                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1934                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1935                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1936                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1937                         continue;
1938
1939                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1940                         be->dai_link->name);
1941
1942                 __soc_pcm_hw_free(be, be_substream);
1943
1944                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1945         }
1946 }
1947
1948 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1949 {
1950         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1951         int stream = substream->stream;
1952
1953         snd_soc_dpcm_mutex_lock(fe);
1954         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1955
1956         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1957
1958         /* call hw_free on the frontend */
1959         soc_pcm_hw_clean(fe, substream, 0);
1960
1961         /* only hw_params backends that are either sinks or sources
1962          * to this frontend DAI */
1963         dpcm_be_dai_hw_free(fe, stream);
1964
1965         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1966         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1967
1968         snd_soc_dpcm_mutex_unlock(fe);
1969         return 0;
1970 }
1971
1972 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1973 {
1974         struct snd_soc_pcm_runtime *be;
1975         struct snd_pcm_substream *be_substream;
1976         struct snd_soc_dpcm *dpcm;
1977         int ret;
1978
1979         for_each_dpcm_be(fe, stream, dpcm) {
1980                 be = dpcm->be;
1981                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1982
1983                 /* is this op for this BE ? */
1984                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1985                         continue;
1986
1987                 /* copy params for each dpcm */
1988                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1989                                 sizeof(struct snd_pcm_hw_params));
1990
1991                 /* perform any hw_params fixups */
1992                 ret = snd_soc_link_be_hw_params_fixup(be, &dpcm->hw_params);
1993                 if (ret < 0)
1994                         goto unwind;
1995
1996                 /* copy the fixed-up hw params for BE dai */
1997                 memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
1998                        sizeof(struct snd_pcm_hw_params));
1999
2000                 /* only allow hw_params() if no connected FEs are running */
2001                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2002                         continue;
2003
2004                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2005                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2006                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2007                         continue;
2008
2009                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2010                         be->dai_link->name);
2011
2012                 ret = __soc_pcm_hw_params(be, be_substream, &dpcm->hw_params);
2013                 if (ret < 0)
2014                         goto unwind;
2015
2016                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2017         }
2018         return 0;
2019
2020 unwind:
2021         dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2022                 __func__, be->dai_link->name, ret);
2023
2024         /* disable any enabled and non active backends */
2025         for_each_dpcm_be_rollback(fe, stream, dpcm) {
2026                 be = dpcm->be;
2027                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2028
2029                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2030                         continue;
2031
2032                 /* only allow hw_free() if no connected FEs are running */
2033                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2034                         continue;
2035
2036                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2037                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2038                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2039                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2040                         continue;
2041
2042                 __soc_pcm_hw_free(be, be_substream);
2043         }
2044
2045         return ret;
2046 }
2047
2048 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2049                                  struct snd_pcm_hw_params *params)
2050 {
2051         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2052         int ret, stream = substream->stream;
2053
2054         snd_soc_dpcm_mutex_lock(fe);
2055         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2056
2057         memcpy(&fe->dpcm[stream].hw_params, params,
2058                         sizeof(struct snd_pcm_hw_params));
2059         ret = dpcm_be_dai_hw_params(fe, stream);
2060         if (ret < 0)
2061                 goto out;
2062
2063         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2064                         fe->dai_link->name, params_rate(params),
2065                         params_channels(params), params_format(params));
2066
2067         /* call hw_params on the frontend */
2068         ret = __soc_pcm_hw_params(fe, substream, params);
2069         if (ret < 0)
2070                 dpcm_be_dai_hw_free(fe, stream);
2071         else
2072                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2073
2074 out:
2075         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2076         snd_soc_dpcm_mutex_unlock(fe);
2077
2078         return soc_pcm_ret(fe, ret);
2079 }
2080
2081 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2082                                int cmd)
2083 {
2084         struct snd_soc_pcm_runtime *be;
2085         bool pause_stop_transition;
2086         struct snd_soc_dpcm *dpcm;
2087         unsigned long flags;
2088         int ret = 0;
2089
2090         for_each_dpcm_be(fe, stream, dpcm) {
2091                 struct snd_pcm_substream *be_substream;
2092
2093                 be = dpcm->be;
2094                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2095
2096                 snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
2097
2098                 /* is this op for this BE ? */
2099                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2100                         goto next;
2101
2102                 dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
2103                         be->dai_link->name, cmd);
2104
2105                 switch (cmd) {
2106                 case SNDRV_PCM_TRIGGER_START:
2107                         if (!be->dpcm[stream].be_start &&
2108                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2109                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2110                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2111                                 goto next;
2112
2113                         be->dpcm[stream].be_start++;
2114                         if (be->dpcm[stream].be_start != 1)
2115                                 goto next;
2116
2117                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
2118                                 ret = soc_pcm_trigger(be_substream,
2119                                                       SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
2120                         else
2121                                 ret = soc_pcm_trigger(be_substream,
2122                                                       SNDRV_PCM_TRIGGER_START);
2123                         if (ret) {
2124                                 be->dpcm[stream].be_start--;
2125                                 goto next;
2126                         }
2127
2128                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2129                         break;
2130                 case SNDRV_PCM_TRIGGER_RESUME:
2131                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2132                                 goto next;
2133
2134                         be->dpcm[stream].be_start++;
2135                         if (be->dpcm[stream].be_start != 1)
2136                                 goto next;
2137
2138                         ret = soc_pcm_trigger(be_substream, cmd);
2139                         if (ret) {
2140                                 be->dpcm[stream].be_start--;
2141                                 goto next;
2142                         }
2143
2144                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2145                         break;
2146                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2147                         if (!be->dpcm[stream].be_start &&
2148                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2149                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2150                                 goto next;
2151
2152                         fe->dpcm[stream].fe_pause = false;
2153                         be->dpcm[stream].be_pause--;
2154
2155                         be->dpcm[stream].be_start++;
2156                         if (be->dpcm[stream].be_start != 1)
2157                                 goto next;
2158
2159                         ret = soc_pcm_trigger(be_substream, cmd);
2160                         if (ret) {
2161                                 be->dpcm[stream].be_start--;
2162                                 goto next;
2163                         }
2164
2165                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2166                         break;
2167                 case SNDRV_PCM_TRIGGER_STOP:
2168                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2169                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2170                                 goto next;
2171
2172                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2173                                 be->dpcm[stream].be_start--;
2174
2175                         if (be->dpcm[stream].be_start != 0)
2176                                 goto next;
2177
2178                         pause_stop_transition = false;
2179                         if (fe->dpcm[stream].fe_pause) {
2180                                 pause_stop_transition = true;
2181                                 fe->dpcm[stream].fe_pause = false;
2182                                 be->dpcm[stream].be_pause--;
2183                         }
2184
2185                         if (be->dpcm[stream].be_pause != 0)
2186                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
2187                         else
2188                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
2189
2190                         if (ret) {
2191                                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2192                                         be->dpcm[stream].be_start++;
2193                                 if (pause_stop_transition) {
2194                                         fe->dpcm[stream].fe_pause = true;
2195                                         be->dpcm[stream].be_pause++;
2196                                 }
2197                                 goto next;
2198                         }
2199
2200                         if (be->dpcm[stream].be_pause != 0)
2201                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2202                         else
2203                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2204
2205                         break;
2206                 case SNDRV_PCM_TRIGGER_SUSPEND:
2207                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2208                                 goto next;
2209
2210                         be->dpcm[stream].be_start--;
2211                         if (be->dpcm[stream].be_start != 0)
2212                                 goto next;
2213
2214                         ret = soc_pcm_trigger(be_substream, cmd);
2215                         if (ret) {
2216                                 be->dpcm[stream].be_start++;
2217                                 goto next;
2218                         }
2219
2220                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2221                         break;
2222                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2223                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2224                                 goto next;
2225
2226                         fe->dpcm[stream].fe_pause = true;
2227                         be->dpcm[stream].be_pause++;
2228
2229                         be->dpcm[stream].be_start--;
2230                         if (be->dpcm[stream].be_start != 0)
2231                                 goto next;
2232
2233                         ret = soc_pcm_trigger(be_substream, cmd);
2234                         if (ret) {
2235                                 be->dpcm[stream].be_start++;
2236                                 goto next;
2237                         }
2238
2239                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2240                         break;
2241                 }
2242 next:
2243                 snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
2244                 if (ret)
2245                         break;
2246         }
2247         return soc_pcm_ret(fe, ret);
2248 }
2249 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2250
2251 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2252                                   int cmd, bool fe_first)
2253 {
2254         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2255         int ret;
2256
2257         /* call trigger on the frontend before the backend. */
2258         if (fe_first) {
2259                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2260                         fe->dai_link->name, cmd);
2261
2262                 ret = soc_pcm_trigger(substream, cmd);
2263                 if (ret < 0)
2264                         return ret;
2265
2266                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2267                 return ret;
2268         }
2269
2270         /* call trigger on the frontend after the backend. */
2271         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2272         if (ret < 0)
2273                 return ret;
2274
2275         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2276                 fe->dai_link->name, cmd);
2277
2278         ret = soc_pcm_trigger(substream, cmd);
2279
2280         return ret;
2281 }
2282
2283 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2284 {
2285         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2286         int stream = substream->stream;
2287         int ret = 0;
2288         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2289
2290         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2291
2292         switch (trigger) {
2293         case SND_SOC_DPCM_TRIGGER_PRE:
2294                 switch (cmd) {
2295                 case SNDRV_PCM_TRIGGER_START:
2296                 case SNDRV_PCM_TRIGGER_RESUME:
2297                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2298                 case SNDRV_PCM_TRIGGER_DRAIN:
2299                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2300                         break;
2301                 case SNDRV_PCM_TRIGGER_STOP:
2302                 case SNDRV_PCM_TRIGGER_SUSPEND:
2303                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2304                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2305                         break;
2306                 default:
2307                         ret = -EINVAL;
2308                         break;
2309                 }
2310                 break;
2311         case SND_SOC_DPCM_TRIGGER_POST:
2312                 switch (cmd) {
2313                 case SNDRV_PCM_TRIGGER_START:
2314                 case SNDRV_PCM_TRIGGER_RESUME:
2315                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2316                 case SNDRV_PCM_TRIGGER_DRAIN:
2317                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2318                         break;
2319                 case SNDRV_PCM_TRIGGER_STOP:
2320                 case SNDRV_PCM_TRIGGER_SUSPEND:
2321                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2322                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2323                         break;
2324                 default:
2325                         ret = -EINVAL;
2326                         break;
2327                 }
2328                 break;
2329         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2330                 /* bespoke trigger() - handles both FE and BEs */
2331
2332                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2333                                 fe->dai_link->name, cmd);
2334
2335                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2336                 break;
2337         default:
2338                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2339                                 fe->dai_link->name);
2340                 ret = -EINVAL;
2341                 goto out;
2342         }
2343
2344         if (ret < 0) {
2345                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2346                         cmd, ret);
2347                 goto out;
2348         }
2349
2350         switch (cmd) {
2351         case SNDRV_PCM_TRIGGER_START:
2352         case SNDRV_PCM_TRIGGER_RESUME:
2353         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2354                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2355                 break;
2356         case SNDRV_PCM_TRIGGER_STOP:
2357         case SNDRV_PCM_TRIGGER_SUSPEND:
2358                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2359                 break;
2360         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2361                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2362                 break;
2363         }
2364
2365 out:
2366         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2367         return ret;
2368 }
2369
2370 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2371 {
2372         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2373         int stream = substream->stream;
2374
2375         /* if FE's runtime_update is already set, we're in race;
2376          * process this trigger later at exit
2377          */
2378         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2379                 fe->dpcm[stream].trigger_pending = cmd + 1;
2380                 return 0; /* delayed, assuming it's successful */
2381         }
2382
2383         /* we're alone, let's trigger */
2384         return dpcm_fe_dai_do_trigger(substream, cmd);
2385 }
2386
2387 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2388 {
2389         struct snd_soc_dpcm *dpcm;
2390         int ret = 0;
2391
2392         for_each_dpcm_be(fe, stream, dpcm) {
2393
2394                 struct snd_soc_pcm_runtime *be = dpcm->be;
2395                 struct snd_pcm_substream *be_substream =
2396                         snd_soc_dpcm_get_substream(be, stream);
2397
2398                 /* is this op for this BE ? */
2399                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2400                         continue;
2401
2402                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2403                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2404                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2405                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2406                         continue;
2407
2408                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2409                         be->dai_link->name);
2410
2411                 ret = __soc_pcm_prepare(be, be_substream);
2412                 if (ret < 0)
2413                         break;
2414
2415                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2416         }
2417
2418         return soc_pcm_ret(fe, ret);
2419 }
2420
2421 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2422 {
2423         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2424         int stream = substream->stream, ret = 0;
2425
2426         snd_soc_dpcm_mutex_lock(fe);
2427
2428         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2429
2430         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2431
2432         /* there is no point preparing this FE if there are no BEs */
2433         if (list_empty(&fe->dpcm[stream].be_clients)) {
2434                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2435                                 fe->dai_link->name);
2436                 ret = -EINVAL;
2437                 goto out;
2438         }
2439
2440         ret = dpcm_be_dai_prepare(fe, stream);
2441         if (ret < 0)
2442                 goto out;
2443
2444         /* call prepare on the frontend */
2445         ret = __soc_pcm_prepare(fe, substream);
2446         if (ret < 0)
2447                 goto out;
2448
2449         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2450
2451 out:
2452         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2453         snd_soc_dpcm_mutex_unlock(fe);
2454
2455         return soc_pcm_ret(fe, ret);
2456 }
2457
2458 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2459 {
2460         struct snd_pcm_substream *substream =
2461                 snd_soc_dpcm_get_substream(fe, stream);
2462         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2463         int err;
2464
2465         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2466                         stream ? "capture" : "playback", fe->dai_link->name);
2467
2468         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2469                 /* call bespoke trigger - FE takes care of all BE triggers */
2470                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2471                                 fe->dai_link->name);
2472
2473                 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2474         } else {
2475                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2476                         fe->dai_link->name);
2477
2478                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2479         }
2480
2481         dpcm_be_dai_hw_free(fe, stream);
2482
2483         dpcm_be_dai_shutdown(fe, stream);
2484
2485         /* run the stream event for each BE */
2486         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2487
2488         return soc_pcm_ret(fe, err);
2489 }
2490
2491 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2492 {
2493         struct snd_pcm_substream *substream =
2494                 snd_soc_dpcm_get_substream(fe, stream);
2495         struct snd_soc_dpcm *dpcm;
2496         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2497         int ret = 0;
2498
2499         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2500                         stream ? "capture" : "playback", fe->dai_link->name);
2501
2502         /* Only start the BE if the FE is ready */
2503         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2504                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
2505                 dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
2506                         fe->dai_link->name, fe->dpcm[stream].state);
2507                 ret = -EINVAL;
2508                 goto disconnect;
2509         }
2510
2511         /* startup must always be called for new BEs */
2512         ret = dpcm_be_dai_startup(fe, stream);
2513         if (ret < 0)
2514                 goto disconnect;
2515
2516         /* keep going if FE state is > open */
2517         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2518                 return 0;
2519
2520         ret = dpcm_be_dai_hw_params(fe, stream);
2521         if (ret < 0)
2522                 goto close;
2523
2524         /* keep going if FE state is > hw_params */
2525         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2526                 return 0;
2527
2528         ret = dpcm_be_dai_prepare(fe, stream);
2529         if (ret < 0)
2530                 goto hw_free;
2531
2532         /* run the stream event for each BE */
2533         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2534
2535         /* keep going if FE state is > prepare */
2536         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2537                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2538                 return 0;
2539
2540         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2541                 /* call trigger on the frontend - FE takes care of all BE triggers */
2542                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2543                                 fe->dai_link->name);
2544
2545                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2546                 if (ret < 0)
2547                         goto hw_free;
2548         } else {
2549                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2550                         fe->dai_link->name);
2551
2552                 ret = dpcm_be_dai_trigger(fe, stream,
2553                                         SNDRV_PCM_TRIGGER_START);
2554                 if (ret < 0)
2555                         goto hw_free;
2556         }
2557
2558         return 0;
2559
2560 hw_free:
2561         dpcm_be_dai_hw_free(fe, stream);
2562 close:
2563         dpcm_be_dai_shutdown(fe, stream);
2564 disconnect:
2565         /* disconnect any pending BEs */
2566         for_each_dpcm_be(fe, stream, dpcm) {
2567                 struct snd_soc_pcm_runtime *be = dpcm->be;
2568
2569                 /* is this op for this BE ? */
2570                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2571                         continue;
2572
2573                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
2574                         be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
2575                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2576         }
2577
2578         return soc_pcm_ret(fe, ret);
2579 }
2580
2581 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2582 {
2583         struct snd_soc_dapm_widget_list *list;
2584         int stream;
2585         int count, paths;
2586
2587         if (!fe->dai_link->dynamic)
2588                 return 0;
2589
2590         if (fe->dai_link->num_cpus > 1) {
2591                 dev_err(fe->dev,
2592                         "%s doesn't support Multi CPU yet\n", __func__);
2593                 return -EINVAL;
2594         }
2595
2596         /* only check active links */
2597         if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
2598                 return 0;
2599
2600         /* DAPM sync will call this to update DSP paths */
2601         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2602                 new ? "new" : "old", fe->dai_link->name);
2603
2604         for_each_pcm_streams(stream) {
2605
2606                 /* skip if FE doesn't have playback/capture capability */
2607                 if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
2608                     !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
2609                         continue;
2610
2611                 /* skip if FE isn't currently playing/capturing */
2612                 if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
2613                     !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
2614                         continue;
2615
2616                 paths = dpcm_path_get(fe, stream, &list);
2617                 if (paths < 0)
2618                         return paths;
2619
2620                 /* update any playback/capture paths */
2621                 count = dpcm_process_paths(fe, stream, &list, new);
2622                 if (count) {
2623                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2624                         if (new)
2625                                 dpcm_run_update_startup(fe, stream);
2626                         else
2627                                 dpcm_run_update_shutdown(fe, stream);
2628                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2629
2630                         dpcm_clear_pending_state(fe, stream);
2631                         dpcm_be_disconnect(fe, stream);
2632                 }
2633
2634                 dpcm_path_put(&list);
2635         }
2636
2637         return 0;
2638 }
2639
2640 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2641  * any DAI links.
2642  */
2643 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2644 {
2645         struct snd_soc_pcm_runtime *fe;
2646         int ret = 0;
2647
2648         mutex_lock_nested(&card->pcm_mutex, card->pcm_subclass);
2649         /* shutdown all old paths first */
2650         for_each_card_rtds(card, fe) {
2651                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2652                 if (ret)
2653                         goto out;
2654         }
2655
2656         /* bring new paths up */
2657         for_each_card_rtds(card, fe) {
2658                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2659                 if (ret)
2660                         goto out;
2661         }
2662
2663 out:
2664         mutex_unlock(&card->pcm_mutex);
2665         return ret;
2666 }
2667 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2668
2669 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2670 {
2671         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2672         struct snd_soc_dpcm *dpcm;
2673         int stream = fe_substream->stream;
2674
2675         snd_soc_dpcm_mutex_assert_held(fe);
2676
2677         /* mark FE's links ready to prune */
2678         for_each_dpcm_be(fe, stream, dpcm)
2679                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2680
2681         dpcm_be_disconnect(fe, stream);
2682
2683         fe->dpcm[stream].runtime = NULL;
2684 }
2685
2686 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2687 {
2688         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2689         int ret;
2690
2691         snd_soc_dpcm_mutex_lock(fe);
2692         ret = dpcm_fe_dai_shutdown(fe_substream);
2693
2694         dpcm_fe_dai_cleanup(fe_substream);
2695
2696         snd_soc_dpcm_mutex_unlock(fe);
2697         return ret;
2698 }
2699
2700 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2701 {
2702         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2703         struct snd_soc_dapm_widget_list *list;
2704         int ret;
2705         int stream = fe_substream->stream;
2706
2707         snd_soc_dpcm_mutex_lock(fe);
2708         fe->dpcm[stream].runtime = fe_substream->runtime;
2709
2710         ret = dpcm_path_get(fe, stream, &list);
2711         if (ret < 0)
2712                 goto open_end;
2713
2714         /* calculate valid and active FE <-> BE dpcms */
2715         dpcm_process_paths(fe, stream, &list, 1);
2716
2717         ret = dpcm_fe_dai_startup(fe_substream);
2718         if (ret < 0)
2719                 dpcm_fe_dai_cleanup(fe_substream);
2720
2721         dpcm_clear_pending_state(fe, stream);
2722         dpcm_path_put(&list);
2723 open_end:
2724         snd_soc_dpcm_mutex_unlock(fe);
2725         return ret;
2726 }
2727
2728 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
2729                                     int *playback, int *capture)
2730 {
2731         struct snd_soc_dai *cpu_dai;
2732         int i;
2733
2734         if (rtd->dai_link->dynamic && rtd->dai_link->num_cpus > 1) {
2735                 dev_err(rtd->dev,
2736                         "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2737                 return -EINVAL;
2738         }
2739
2740         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2741                 int stream;
2742
2743                 if (rtd->dai_link->dpcm_playback) {
2744                         stream = SNDRV_PCM_STREAM_PLAYBACK;
2745
2746                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2747                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2748                                         *playback = 1;
2749                                         break;
2750                                 }
2751                         }
2752                         if (!*playback) {
2753                                 dev_err(rtd->card->dev,
2754                                         "No CPU DAIs support playback for stream %s\n",
2755                                         rtd->dai_link->stream_name);
2756                                 return -EINVAL;
2757                         }
2758                 }
2759                 if (rtd->dai_link->dpcm_capture) {
2760                         stream = SNDRV_PCM_STREAM_CAPTURE;
2761
2762                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2763                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2764                                         *capture = 1;
2765                                         break;
2766                                 }
2767                         }
2768
2769                         if (!*capture) {
2770                                 dev_err(rtd->card->dev,
2771                                         "No CPU DAIs support capture for stream %s\n",
2772                                         rtd->dai_link->stream_name);
2773                                 return -EINVAL;
2774                         }
2775                 }
2776         } else {
2777                 struct snd_soc_dai *codec_dai;
2778
2779                 /* Adapt stream for codec2codec links */
2780                 int cpu_capture = rtd->dai_link->params ?
2781                         SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
2782                 int cpu_playback = rtd->dai_link->params ?
2783                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2784
2785                 for_each_rtd_codec_dais(rtd, i, codec_dai) {
2786                         if (rtd->dai_link->num_cpus == 1) {
2787                                 cpu_dai = asoc_rtd_to_cpu(rtd, 0);
2788                         } else if (rtd->dai_link->num_cpus == rtd->dai_link->num_codecs) {
2789                                 cpu_dai = asoc_rtd_to_cpu(rtd, i);
2790                         } else {
2791                                 dev_err(rtd->card->dev,
2792                                         "N cpus to M codecs link is not supported yet\n");
2793                                 return -EINVAL;
2794                         }
2795
2796                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2797                             snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2798                                 *playback = 1;
2799                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2800                             snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2801                                 *capture = 1;
2802                 }
2803         }
2804
2805         if (rtd->dai_link->playback_only) {
2806                 *playback = 1;
2807                 *capture = 0;
2808         }
2809
2810         if (rtd->dai_link->capture_only) {
2811                 *playback = 0;
2812                 *capture = 1;
2813         }
2814
2815         return 0;
2816 }
2817
2818 static int soc_create_pcm(struct snd_pcm **pcm,
2819                           struct snd_soc_pcm_runtime *rtd,
2820                           int playback, int capture, int num)
2821 {
2822         char new_name[64];
2823         int ret;
2824
2825         /* create the PCM */
2826         if (rtd->dai_link->params) {
2827                 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2828                          rtd->dai_link->stream_name);
2829
2830                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2831                                            playback, capture, pcm);
2832         } else if (rtd->dai_link->no_pcm) {
2833                 snprintf(new_name, sizeof(new_name), "(%s)",
2834                         rtd->dai_link->stream_name);
2835
2836                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2837                                 playback, capture, pcm);
2838         } else {
2839                 if (rtd->dai_link->dynamic)
2840                         snprintf(new_name, sizeof(new_name), "%s (*)",
2841                                 rtd->dai_link->stream_name);
2842                 else
2843                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2844                                 rtd->dai_link->stream_name,
2845                                 soc_codec_dai_name(rtd), num);
2846
2847                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2848                         capture, pcm);
2849         }
2850         if (ret < 0) {
2851                 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2852                         new_name, rtd->dai_link->name, ret);
2853                 return ret;
2854         }
2855         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2856
2857         return 0;
2858 }
2859
2860 /* create a new pcm */
2861 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2862 {
2863         struct snd_soc_component *component;
2864         struct snd_pcm *pcm;
2865         int ret = 0, playback = 0, capture = 0;
2866         int i;
2867
2868         ret = soc_get_playback_capture(rtd, &playback, &capture);
2869         if (ret < 0)
2870                 return ret;
2871
2872         ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
2873         if (ret < 0)
2874                 return ret;
2875
2876         /* DAPM dai link stream work */
2877         /*
2878          * Currently nothing to do for c2c links
2879          * Since c2c links are internal nodes in the DAPM graph and
2880          * don't interface with the outside world or application layer
2881          * we don't have to do any special handling on close.
2882          */
2883         if (!rtd->dai_link->params)
2884                 rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2885
2886         rtd->pcm = pcm;
2887         pcm->nonatomic = rtd->dai_link->nonatomic;
2888         pcm->private_data = rtd;
2889         pcm->no_device_suspend = true;
2890
2891         if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
2892                 if (playback)
2893                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2894                 if (capture)
2895                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2896                 goto out;
2897         }
2898
2899         /* ASoC PCM operations */
2900         if (rtd->dai_link->dynamic) {
2901                 rtd->ops.open           = dpcm_fe_dai_open;
2902                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2903                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2904                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2905                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2906                 rtd->ops.close          = dpcm_fe_dai_close;
2907                 rtd->ops.pointer        = soc_pcm_pointer;
2908         } else {
2909                 rtd->ops.open           = soc_pcm_open;
2910                 rtd->ops.hw_params      = soc_pcm_hw_params;
2911                 rtd->ops.prepare        = soc_pcm_prepare;
2912                 rtd->ops.trigger        = soc_pcm_trigger;
2913                 rtd->ops.hw_free        = soc_pcm_hw_free;
2914                 rtd->ops.close          = soc_pcm_close;
2915                 rtd->ops.pointer        = soc_pcm_pointer;
2916         }
2917
2918         for_each_rtd_components(rtd, i, component) {
2919                 const struct snd_soc_component_driver *drv = component->driver;
2920
2921                 if (drv->ioctl)
2922                         rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2923                 if (drv->sync_stop)
2924                         rtd->ops.sync_stop      = snd_soc_pcm_component_sync_stop;
2925                 if (drv->copy_user)
2926                         rtd->ops.copy_user      = snd_soc_pcm_component_copy_user;
2927                 if (drv->page)
2928                         rtd->ops.page           = snd_soc_pcm_component_page;
2929                 if (drv->mmap)
2930                         rtd->ops.mmap           = snd_soc_pcm_component_mmap;
2931                 if (drv->ack)
2932                         rtd->ops.ack            = snd_soc_pcm_component_ack;
2933         }
2934
2935         if (playback)
2936                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2937
2938         if (capture)
2939                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2940
2941         ret = snd_soc_pcm_component_new(rtd);
2942         if (ret < 0)
2943                 return ret;
2944 out:
2945         dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
2946                 soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
2947         return ret;
2948 }
2949
2950 /* is the current PCM operation for this FE ? */
2951 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2952 {
2953         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2954                 return 1;
2955         return 0;
2956 }
2957 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2958
2959 /* is the current PCM operation for this BE ? */
2960 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2961                 struct snd_soc_pcm_runtime *be, int stream)
2962 {
2963         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2964            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2965                   be->dpcm[stream].runtime_update))
2966                 return 1;
2967         return 0;
2968 }
2969 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2970
2971 /* get the substream for this BE */
2972 struct snd_pcm_substream *
2973         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2974 {
2975         return be->pcm->streams[stream].substream;
2976 }
2977 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2978
2979 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
2980                                     struct snd_soc_pcm_runtime *be,
2981                                     int stream,
2982                                     const enum snd_soc_dpcm_state *states,
2983                                     int num_states)
2984 {
2985         struct snd_soc_dpcm *dpcm;
2986         int state;
2987         int ret = 1;
2988         int i;
2989
2990         for_each_dpcm_fe(be, stream, dpcm) {
2991
2992                 if (dpcm->fe == fe)
2993                         continue;
2994
2995                 state = dpcm->fe->dpcm[stream].state;
2996                 for (i = 0; i < num_states; i++) {
2997                         if (state == states[i]) {
2998                                 ret = 0;
2999                                 break;
3000                         }
3001                 }
3002         }
3003
3004         /* it's safe to do this BE DAI */
3005         return ret;
3006 }
3007
3008 /*
3009  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3010  * are not running, paused or suspended for the specified stream direction.
3011  */
3012 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3013                 struct snd_soc_pcm_runtime *be, int stream)
3014 {
3015         const enum snd_soc_dpcm_state state[] = {
3016                 SND_SOC_DPCM_STATE_START,
3017                 SND_SOC_DPCM_STATE_PAUSED,
3018                 SND_SOC_DPCM_STATE_SUSPEND,
3019         };
3020
3021         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3022 }
3023 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3024
3025 /*
3026  * We can only change hw params a BE DAI if any of it's FE are not prepared,
3027  * running, paused or suspended for the specified stream direction.
3028  */
3029 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3030                 struct snd_soc_pcm_runtime *be, int stream)
3031 {
3032         const enum snd_soc_dpcm_state state[] = {
3033                 SND_SOC_DPCM_STATE_START,
3034                 SND_SOC_DPCM_STATE_PAUSED,
3035                 SND_SOC_DPCM_STATE_SUSPEND,
3036                 SND_SOC_DPCM_STATE_PREPARE,
3037         };
3038
3039         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3040 }
3041 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);