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 = &be->dpcm[stream].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                 /* clear the corresponding DAIs parameters when going to be inactive */
 715                 for_each_rtd_dais(rtd, i, dai) {
 716                         if (snd_soc_dai_active(dai) == 0)
 717                                 soc_pcm_set_dai_params(dai, NULL);
 718
 719                         if (snd_soc_dai_stream_active(dai, substream->stream) == 0)
 720                                 snd_soc_dai_digital_mute(dai, 1, substream->stream);
 721                 }
 722         }
 723
 724         for_each_rtd_dais(rtd, i, dai)
 725                 snd_soc_dai_shutdown(dai, substream, rollback);
 726
 727         snd_soc_link_shutdown(substream, rollback);
 728
 729         soc_pcm_components_close(substream, rollback);
 730
 731         snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
 732
 733         for_each_rtd_components(rtd, i, component)
 734                 if (!snd_soc_component_active(component))
 735                         pinctrl_pm_select_sleep_state(component->dev);
 736
 737         return 0;
 738 }
 739
 740 /*
 741  * Called by ALSA when a PCM substream is closed. Private data can be
 742  * freed here. The cpu DAI, codec DAI, machine and components are also
 743  * shutdown.
 744  */
 745 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
 746                            struct snd_pcm_substream *substream)
 747 {
 748         return soc_pcm_clean(rtd, substream, 0);
 749 }
 750
 751 /* PCM close ops for non-DPCM streams */
 752 static int soc_pcm_close(struct snd_pcm_substream *substream)
 753 {
 754         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 755
 756         snd_soc_dpcm_mutex_lock(rtd);
 757         __soc_pcm_close(rtd, substream);
 758         snd_soc_dpcm_mutex_unlock(rtd);
 759         return 0;
 760 }
 761
 762 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
 763 {
 764         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 765         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 766         const char *name_cpu = soc_cpu_dai_name(rtd);
 767         const char *name_codec = soc_codec_dai_name(rtd);
 768         const char *err_msg;
 769         struct device *dev = rtd->dev;
 770
 771         err_msg = "rates";
 772         if (!hw->rates)
 773                 goto config_err;
 774
 775         err_msg = "formats";
 776         if (!hw->formats)
 777                 goto config_err;
 778
 779         err_msg = "channels";
 780         if (!hw->channels_min || !hw->channels_max ||
 781              hw->channels_min  >  hw->channels_max)
 782                 goto config_err;
 783
 784         dev_dbg(dev, "ASoC: %s <-> %s info:\n",         name_codec,
 785                                                         name_cpu);
 786         dev_dbg(dev, "ASoC: rate mask 0x%x\n",          hw->rates);
 787         dev_dbg(dev, "ASoC: ch   min %d max %d\n",      hw->channels_min,
 788                                                         hw->channels_max);
 789         dev_dbg(dev, "ASoC: rate min %d max %d\n",      hw->rate_min,
 790                                                         hw->rate_max);
 791
 792         return 0;
 793
 794 config_err:
 795         dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
 796                 name_codec, name_cpu, err_msg);
 797         return -EINVAL;
 798 }
 799
 800 /*
 801  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 802  * then initialized and any private data can be allocated. This also calls
 803  * startup for the cpu DAI, component, machine and codec DAI.
 804  */
 805 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
 806                           struct snd_pcm_substream *substream)
 807 {
 808         struct snd_soc_component *component;
 809         struct snd_soc_dai *dai;
 810         int i, ret = 0;
 811
 812         snd_soc_dpcm_mutex_assert_held(rtd);
 813
 814         for_each_rtd_components(rtd, i, component)
 815                 pinctrl_pm_select_default_state(component->dev);
 816
 817         ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
 818         if (ret < 0)
 819                 goto err;
 820
 821         ret = soc_pcm_components_open(substream);
 822         if (ret < 0)
 823                 goto err;
 824
 825         ret = snd_soc_link_startup(substream);
 826         if (ret < 0)
 827                 goto err;
 828
 829         /* startup the audio subsystem */
 830         for_each_rtd_dais(rtd, i, dai) {
 831                 ret = snd_soc_dai_startup(dai, substream);
 832                 if (ret < 0)
 833                         goto err;
 834         }
 835
 836         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 837         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 838                 goto dynamic;
 839
 840         /* Check that the codec and cpu DAIs are compatible */
 841         soc_pcm_init_runtime_hw(substream);
 842
 843         soc_pcm_update_symmetry(substream);
 844
 845         ret = soc_hw_sanity_check(substream);
 846         if (ret < 0)
 847                 goto err;
 848
 849         soc_pcm_apply_msb(substream);
 850
 851         /* Symmetry only applies if we've already got an active stream. */
 852         for_each_rtd_dais(rtd, i, dai) {
 853                 ret = soc_pcm_apply_symmetry(substream, dai);
 854                 if (ret != 0)
 855                         goto err;
 856         }
 857 dynamic:
 858         snd_soc_runtime_activate(rtd, substream->stream);
 859         ret = 0;
 860 err:
 861         if (ret < 0)
 862                 soc_pcm_clean(rtd, substream, 1);
 863
 864         return soc_pcm_ret(rtd, ret);
 865 }
 866
 867 /* PCM open ops for non-DPCM streams */
 868 static int soc_pcm_open(struct snd_pcm_substream *substream)
 869 {
 870         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 871         int ret;
 872
 873         snd_soc_dpcm_mutex_lock(rtd);
 874         ret = __soc_pcm_open(rtd, substream);
 875         snd_soc_dpcm_mutex_unlock(rtd);
 876         return ret;
 877 }
 878
 879 /*
 880  * Called by ALSA when the PCM substream is prepared, can set format, sample
 881  * rate, etc.  This function is non atomic and can be called multiple times,
 882  * it can refer to the runtime info.
 883  */
 884 static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
 885                              struct snd_pcm_substream *substream)
 886 {
 887         struct snd_soc_dai *dai;
 888         int i, ret = 0;
 889
 890         snd_soc_dpcm_mutex_assert_held(rtd);
 891
 892         ret = snd_soc_link_prepare(substream);
 893         if (ret < 0)
 894                 goto out;
 895
 896         ret = snd_soc_pcm_component_prepare(substream);
 897         if (ret < 0)
 898                 goto out;
 899
 900         ret = snd_soc_pcm_dai_prepare(substream);
 901         if (ret < 0)
 902                 goto out;
 903
 904         /* cancel any delayed stream shutdown that is pending */
 905         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 906             rtd->pop_wait) {
 907                 rtd->pop_wait = 0;
 908                 cancel_delayed_work(&rtd->delayed_work);
 909         }
 910
 911         snd_soc_dapm_stream_event(rtd, substream->stream,
 912                         SND_SOC_DAPM_STREAM_START);
 913
 914         for_each_rtd_dais(rtd, i, dai)
 915                 snd_soc_dai_digital_mute(dai, 0, substream->stream);
 916
 917 out:
 918         return soc_pcm_ret(rtd, ret);
 919 }
 920
 921 /* PCM prepare ops for non-DPCM streams */
 922 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 923 {
 924         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 925         int ret;
 926
 927         snd_soc_dpcm_mutex_lock(rtd);
 928         ret = __soc_pcm_prepare(rtd, substream);
 929         snd_soc_dpcm_mutex_unlock(rtd);
 930         return ret;
 931 }
 932
 933 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 934                                        unsigned int mask)
 935 {
 936         struct snd_interval *interval;
 937         int channels = hweight_long(mask);
 938
 939         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 940         interval->min = channels;
 941         interval->max = channels;
 942 }
 943
 944 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
 945                             struct snd_pcm_substream *substream, int rollback)
 946 {
 947         struct snd_soc_dai *dai;
 948         int i;
 949
 950         snd_soc_dpcm_mutex_assert_held(rtd);
 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                 unsigned int tdm_mask = snd_soc_dai_tdm_mask_get(codec_dai, substream->stream);
1016
1017                 /*
1018                  * Skip CODECs which don't support the current stream type,
1019                  * the idea being that if a CODEC is not used for the currently
1020                  * set up transfer direction, it should not need to be
1021                  * configured, especially since the configuration used might
1022                  * not even be supported by that CODEC. There may be cases
1023                  * however where a CODEC needs to be set up although it is
1024                  * actually not being used for the transfer, e.g. if a
1025                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
1026                  * for the DAI link including a playback-only CODEC.
1027                  * If this becomes necessary, we will have to augment the
1028                  * machine driver setup with information on how to act, so
1029                  * we can do the right thing here.
1030                  */
1031                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1032                         continue;
1033
1034                 /* copy params for each codec */
1035                 codec_params = *params;
1036
1037                 /* fixup params based on TDM slot masks */
1038                 if (tdm_mask)
1039                         soc_pcm_codec_params_fixup(&codec_params, tdm_mask);
1040
1041                 ret = snd_soc_dai_hw_params(codec_dai, substream,
1042                                             &codec_params);
1043                 if(ret < 0)
1044                         goto out;
1045
1046                 soc_pcm_set_dai_params(codec_dai, &codec_params);
1047                 snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
1048         }
1049
1050         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1051                 /*
1052                  * Skip CPUs which don't support the current stream
1053                  * type. See soc_pcm_init_runtime_hw() for more details
1054                  */
1055                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1056                         continue;
1057
1058                 ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
1059                 if (ret < 0)
1060                         goto out;
1061
1062                 /* store the parameters for each DAI */
1063                 soc_pcm_set_dai_params(cpu_dai, params);
1064                 snd_soc_dapm_update_dai(substream, params, cpu_dai);
1065         }
1066
1067         ret = snd_soc_pcm_component_hw_params(substream, params);
1068 out:
1069         if (ret < 0)
1070                 soc_pcm_hw_clean(rtd, substream, 1);
1071
1072         return soc_pcm_ret(rtd, ret);
1073 }
1074
1075 /* hw_params PCM ops for non-DPCM streams */
1076 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
1077                              struct snd_pcm_hw_params *params)
1078 {
1079         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1080         int ret;
1081
1082         snd_soc_dpcm_mutex_lock(rtd);
1083         ret = __soc_pcm_hw_params(rtd, substream, params);
1084         snd_soc_dpcm_mutex_unlock(rtd);
1085         return ret;
1086 }
1087
1088 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1089 {
1090         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1091         struct snd_soc_component *component;
1092         int ret = -EINVAL, _ret = 0, start_dma_last = 0, i;
1093         int rollback = 0;
1094
1095         switch (cmd) {
1096         case SNDRV_PCM_TRIGGER_START:
1097         case SNDRV_PCM_TRIGGER_RESUME:
1098         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1099                 /* Do we need to start dma last? */
1100                 for_each_rtd_components(rtd, i, component) {
1101                         if (component->driver->start_dma_last) {
1102                                 start_dma_last = 1;
1103                                 break;
1104                         }
1105                 }
1106
1107                 ret = snd_soc_link_trigger(substream, cmd, 0);
1108                 if (ret < 0)
1109                         goto start_err;
1110
1111                 if (start_dma_last) {
1112                         ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
1113                         if (ret < 0)
1114                                 goto start_err;
1115
1116                         ret = snd_soc_pcm_component_trigger(substream, cmd, 0);
1117                 } else {
1118                         ret = snd_soc_pcm_component_trigger(substream, cmd, 0);
1119                         if (ret < 0)
1120                                 goto start_err;
1121
1122                         ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
1123                 }
1124 start_err:
1125                 if (ret < 0)
1126                         rollback = 1;
1127         }
1128
1129         if (rollback) {
1130                 _ret = ret;
1131                 switch (cmd) {
1132                 case SNDRV_PCM_TRIGGER_START:
1133                         cmd = SNDRV_PCM_TRIGGER_STOP;
1134                         break;
1135                 case SNDRV_PCM_TRIGGER_RESUME:
1136                         cmd = SNDRV_PCM_TRIGGER_SUSPEND;
1137                         break;
1138                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1139                         cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
1140                         break;
1141                 }
1142         }
1143
1144         switch (cmd) {
1145         case SNDRV_PCM_TRIGGER_STOP:
1146         case SNDRV_PCM_TRIGGER_SUSPEND:
1147         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1148                 if (rtd->dai_link->stop_dma_first) {
1149                         ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
1150                         if (ret < 0)
1151                                 break;
1152
1153                         ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
1154                         if (ret < 0)
1155                                 break;
1156                 } else {
1157                         ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
1158                         if (ret < 0)
1159                                 break;
1160
1161                         ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
1162                         if (ret < 0)
1163                                 break;
1164                 }
1165                 ret = snd_soc_link_trigger(substream, cmd, rollback);
1166                 break;
1167         }
1168
1169         if (_ret)
1170                 ret = _ret;
1171
1172         return ret;
1173 }
1174
1175 /*
1176  * soc level wrapper for pointer callback
1177  * If cpu_dai, codec_dai, component driver has the delay callback, then
1178  * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
1179  */
1180 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1181 {
1182         struct snd_pcm_runtime *runtime = substream->runtime;
1183         snd_pcm_uframes_t offset = 0;
1184         snd_pcm_sframes_t codec_delay = 0;
1185         snd_pcm_sframes_t cpu_delay = 0;
1186
1187         offset = snd_soc_pcm_component_pointer(substream);
1188
1189         /* should be called *after* snd_soc_pcm_component_pointer() */
1190         snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
1191         snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
1192
1193         runtime->delay = cpu_delay + codec_delay;
1194
1195         return offset;
1196 }
1197
1198 /* connect a FE and BE */
1199 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1200                 struct snd_soc_pcm_runtime *be, int stream)
1201 {
1202         struct snd_pcm_substream *fe_substream;
1203         struct snd_pcm_substream *be_substream;
1204         struct snd_soc_dpcm *dpcm;
1205
1206         snd_soc_dpcm_mutex_assert_held(fe);
1207
1208         /* only add new dpcms */
1209         for_each_dpcm_be(fe, stream, dpcm) {
1210                 if (dpcm->be == be && dpcm->fe == fe)
1211                         return 0;
1212         }
1213
1214         fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1215         be_substream = snd_soc_dpcm_get_substream(be, stream);
1216
1217         if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
1218                 dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
1219                         __func__);
1220                 return -EINVAL;
1221         }
1222         if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
1223                 dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n");
1224                 be_substream->pcm->nonatomic = 1;
1225         }
1226
1227         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1228         if (!dpcm)
1229                 return -ENOMEM;
1230
1231         dpcm->be = be;
1232         dpcm->fe = fe;
1233         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1234         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1235         snd_soc_dpcm_stream_lock_irq(fe, stream);
1236         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1237         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1238         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1239
1240         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1241                         stream ? "capture" : "playback",  fe->dai_link->name,
1242                         stream ? "<-" : "->", be->dai_link->name);
1243
1244         dpcm_create_debugfs_state(dpcm, stream);
1245
1246         return 1;
1247 }
1248
1249 /* reparent a BE onto another FE */
1250 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1251                         struct snd_soc_pcm_runtime *be, int stream)
1252 {
1253         struct snd_soc_dpcm *dpcm;
1254         struct snd_pcm_substream *fe_substream, *be_substream;
1255
1256         /* reparent if BE is connected to other FEs */
1257         if (!be->dpcm[stream].users)
1258                 return;
1259
1260         be_substream = snd_soc_dpcm_get_substream(be, stream);
1261         if (!be_substream)
1262                 return;
1263
1264         for_each_dpcm_fe(be, stream, dpcm) {
1265                 if (dpcm->fe == fe)
1266                         continue;
1267
1268                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1269                         stream ? "capture" : "playback",
1270                         dpcm->fe->dai_link->name,
1271                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1272
1273                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1274                 be_substream->runtime = fe_substream->runtime;
1275                 break;
1276         }
1277 }
1278
1279 /* disconnect a BE and FE */
1280 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1281 {
1282         struct snd_soc_dpcm *dpcm, *d;
1283         LIST_HEAD(deleted_dpcms);
1284
1285         snd_soc_dpcm_mutex_assert_held(fe);
1286
1287         snd_soc_dpcm_stream_lock_irq(fe, stream);
1288         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1289                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1290                                 stream ? "capture" : "playback",
1291                                 dpcm->be->dai_link->name);
1292
1293                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1294                         continue;
1295
1296                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1297                         stream ? "capture" : "playback", fe->dai_link->name,
1298                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1299
1300                 /* BEs still alive need new FE */
1301                 dpcm_be_reparent(fe, dpcm->be, stream);
1302
1303                 list_del(&dpcm->list_be);
1304                 list_move(&dpcm->list_fe, &deleted_dpcms);
1305         }
1306         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1307
1308         while (!list_empty(&deleted_dpcms)) {
1309                 dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
1310                                         list_fe);
1311                 list_del(&dpcm->list_fe);
1312                 dpcm_remove_debugfs_state(dpcm);
1313                 kfree(dpcm);
1314         }
1315 }
1316
1317 /* get BE for DAI widget and stream */
1318 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1319                 struct snd_soc_dapm_widget *widget, int stream)
1320 {
1321         struct snd_soc_pcm_runtime *be;
1322         struct snd_soc_dapm_widget *w;
1323         struct snd_soc_dai *dai;
1324         int i;
1325
1326         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1327
1328         for_each_card_rtds(card, be) {
1329
1330                 if (!be->dai_link->no_pcm)
1331                         continue;
1332
1333                 if (!snd_soc_dpcm_get_substream(be, stream))
1334                         continue;
1335
1336                 for_each_rtd_dais(be, i, dai) {
1337                         w = snd_soc_dai_get_widget(dai, stream);
1338
1339                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1340                                 w ? w->name : "(not set)");
1341
1342                         if (w == widget)
1343                                 return be;
1344                 }
1345         }
1346
1347         /* Widget provided is not a BE */
1348         return NULL;
1349 }
1350
1351 int widget_in_list(struct snd_soc_dapm_widget_list *list,
1352                 struct snd_soc_dapm_widget *widget)
1353 {
1354         struct snd_soc_dapm_widget *w;
1355         int i;
1356
1357         for_each_dapm_widgets(list, i, w)
1358                 if (widget == w)
1359                         return 1;
1360
1361         return 0;
1362 }
1363 EXPORT_SYMBOL_GPL(widget_in_list);
1364
1365 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
1366 {
1367         struct snd_soc_card *card = widget->dapm->card;
1368         struct snd_soc_pcm_runtime *rtd;
1369         int stream;
1370
1371         /* adjust dir to stream */
1372         if (dir == SND_SOC_DAPM_DIR_OUT)
1373                 stream = SNDRV_PCM_STREAM_PLAYBACK;
1374         else
1375                 stream = SNDRV_PCM_STREAM_CAPTURE;
1376
1377         rtd = dpcm_get_be(card, widget, stream);
1378         if (rtd)
1379                 return true;
1380
1381         return false;
1382 }
1383 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
1384
1385 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1386         int stream, struct snd_soc_dapm_widget_list **list)
1387 {
1388         struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
1389         int paths;
1390
1391         if (fe->dai_link->num_cpus > 1) {
1392                 dev_err(fe->dev,
1393                         "%s doesn't support Multi CPU yet\n", __func__);
1394                 return -EINVAL;
1395         }
1396
1397         /* get number of valid DAI paths and their widgets */
1398         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1399                         fe->card->component_chaining ?
1400                                 NULL : dpcm_end_walk_at_be);
1401
1402         if (paths > 0)
1403                 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1404                         stream ? "capture" : "playback");
1405         else if (paths == 0)
1406                 dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
1407                          stream ? "capture" : "playback");
1408
1409         return paths;
1410 }
1411
1412 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1413 {
1414         snd_soc_dapm_dai_free_widgets(list);
1415 }
1416
1417 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1418                               struct snd_soc_dapm_widget_list *list)
1419 {
1420         struct snd_soc_dai *dai;
1421         unsigned int i;
1422
1423         /* is there a valid DAI widget for this BE */
1424         for_each_rtd_dais(dpcm->be, i, dai) {
1425                 struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
1426
1427                 /*
1428                  * The BE is pruned only if none of the dai
1429                  * widgets are in the active list.
1430                  */
1431                 if (widget && widget_in_list(list, widget))
1432                         return true;
1433         }
1434
1435         return false;
1436 }
1437
1438 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1439                             struct snd_soc_dapm_widget_list **list_)
1440 {
1441         struct snd_soc_dpcm *dpcm;
1442         int prune = 0;
1443
1444         /* Destroy any old FE <--> BE connections */
1445         for_each_dpcm_be(fe, stream, dpcm) {
1446                 if (dpcm_be_is_active(dpcm, stream, *list_))
1447                         continue;
1448
1449                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1450                         stream ? "capture" : "playback",
1451                         dpcm->be->dai_link->name, fe->dai_link->name);
1452                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1453                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
1454                 prune++;
1455         }
1456
1457         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1458         return prune;
1459 }
1460
1461 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1462         struct snd_soc_dapm_widget_list **list_)
1463 {
1464         struct snd_soc_card *card = fe->card;
1465         struct snd_soc_dapm_widget_list *list = *list_;
1466         struct snd_soc_pcm_runtime *be;
1467         struct snd_soc_dapm_widget *widget;
1468         int i, new = 0, err;
1469
1470         /* don't connect if FE is not running */
1471         if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1472                 return new;
1473
1474         /* Create any new FE <--> BE connections */
1475         for_each_dapm_widgets(list, i, widget) {
1476
1477                 switch (widget->id) {
1478                 case snd_soc_dapm_dai_in:
1479                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1480                                 continue;
1481                         break;
1482                 case snd_soc_dapm_dai_out:
1483                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1484                                 continue;
1485                         break;
1486                 default:
1487                         continue;
1488                 }
1489
1490                 /* is there a valid BE rtd for this widget */
1491                 be = dpcm_get_be(card, widget, stream);
1492                 if (!be) {
1493                         dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
1494                                 widget->name);
1495                         continue;
1496                 }
1497
1498                 /*
1499                  * Filter for systems with 'component_chaining' enabled.
1500                  * This helps to avoid unnecessary re-configuration of an
1501                  * already active BE on such systems.
1502                  */
1503                 if (fe->card->component_chaining &&
1504                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1505                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1506                         continue;
1507
1508                 /* newly connected FE and BE */
1509                 err = dpcm_be_connect(fe, be, stream);
1510                 if (err < 0) {
1511                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1512                                 widget->name);
1513                         break;
1514                 } else if (err == 0) /* already connected */
1515                         continue;
1516
1517                 /* new */
1518                 dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
1519                 new++;
1520         }
1521
1522         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1523         return new;
1524 }
1525
1526 /*
1527  * Find the corresponding BE DAIs that source or sink audio to this
1528  * FE substream.
1529  */
1530 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1531         int stream, struct snd_soc_dapm_widget_list **list, int new)
1532 {
1533         if (new)
1534                 return dpcm_add_paths(fe, stream, list);
1535         else
1536                 return dpcm_prune_paths(fe, stream, list);
1537 }
1538
1539 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1540 {
1541         struct snd_soc_dpcm *dpcm;
1542
1543         for_each_dpcm_be(fe, stream, dpcm)
1544                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
1545 }
1546
1547 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
1548                       int do_hw_free, struct snd_soc_dpcm *last)
1549 {
1550         struct snd_soc_dpcm *dpcm;
1551
1552         /* disable any enabled and non active backends */
1553         for_each_dpcm_be(fe, stream, dpcm) {
1554                 struct snd_soc_pcm_runtime *be = dpcm->be;
1555                 struct snd_pcm_substream *be_substream =
1556                         snd_soc_dpcm_get_substream(be, stream);
1557
1558                 if (dpcm == last)
1559                         return;
1560
1561                 /* is this op for this BE ? */
1562                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1563                         continue;
1564
1565                 if (be->dpcm[stream].users == 0) {
1566                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1567                                 stream ? "capture" : "playback",
1568                                 be->dpcm[stream].state);
1569                         continue;
1570                 }
1571
1572                 if (--be->dpcm[stream].users != 0)
1573                         continue;
1574
1575                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
1576                         if (!do_hw_free)
1577                                 continue;
1578
1579                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
1580                                 __soc_pcm_hw_free(be, be_substream);
1581                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1582                         }
1583                 }
1584
1585                 __soc_pcm_close(be, be_substream);
1586                 be_substream->runtime = NULL;
1587                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1588         }
1589 }
1590
1591 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1592 {
1593         struct snd_soc_pcm_runtime *be;
1594         struct snd_soc_dpcm *dpcm;
1595         int err, count = 0;
1596
1597         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1598         for_each_dpcm_be(fe, stream, dpcm) {
1599                 struct snd_pcm_substream *be_substream;
1600
1601                 be = dpcm->be;
1602                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1603
1604                 if (!be_substream) {
1605                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1606                                 stream ? "capture" : "playback");
1607                         continue;
1608                 }
1609
1610                 /* is this op for this BE ? */
1611                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1612                         continue;
1613
1614                 /* first time the dpcm is open ? */
1615                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
1616                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1617                                 stream ? "capture" : "playback",
1618                                 be->dpcm[stream].state);
1619                         continue;
1620                 }
1621
1622                 if (be->dpcm[stream].users++ != 0)
1623                         continue;
1624
1625                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1626                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1627                         continue;
1628
1629                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1630                         stream ? "capture" : "playback", be->dai_link->name);
1631
1632                 be_substream->runtime = be->dpcm[stream].runtime;
1633                 err = __soc_pcm_open(be, be_substream);
1634                 if (err < 0) {
1635                         be->dpcm[stream].users--;
1636                         if (be->dpcm[stream].users < 0)
1637                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1638                                         stream ? "capture" : "playback",
1639                                         be->dpcm[stream].state);
1640
1641                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1642                         goto unwind;
1643                 }
1644                 be->dpcm[stream].be_start = 0;
1645                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1646                 count++;
1647         }
1648
1649         return count;
1650
1651 unwind:
1652         dpcm_be_dai_startup_rollback(fe, stream, dpcm);
1653
1654         return soc_pcm_ret(fe, err);
1655 }
1656
1657 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
1658 {
1659         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1660         struct snd_pcm_runtime *runtime = substream->runtime;
1661         struct snd_pcm_hardware *hw = &runtime->hw;
1662         struct snd_soc_dai *dai;
1663         int stream = substream->stream;
1664         int i;
1665
1666         soc_pcm_hw_init(hw);
1667
1668         for_each_rtd_cpu_dais(fe, i, dai) {
1669                 struct snd_soc_pcm_stream *cpu_stream;
1670
1671                 /*
1672                  * Skip CPUs which don't support the current stream
1673                  * type. See soc_pcm_init_runtime_hw() for more details
1674                  */
1675                 if (!snd_soc_dai_stream_valid(dai, stream))
1676                         continue;
1677
1678                 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1679
1680                 soc_pcm_hw_update_rate(hw, cpu_stream);
1681                 soc_pcm_hw_update_chan(hw, cpu_stream);
1682                 soc_pcm_hw_update_format(hw, cpu_stream);
1683         }
1684
1685 }
1686
1687 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
1688 {
1689         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1690         struct snd_pcm_runtime *runtime = substream->runtime;
1691         struct snd_pcm_hardware *hw = &runtime->hw;
1692         struct snd_soc_dpcm *dpcm;
1693         struct snd_soc_dai *dai;
1694         int stream = substream->stream;
1695
1696         if (!fe->dai_link->dpcm_merged_format)
1697                 return;
1698
1699         /*
1700          * It returns merged BE codec format
1701          * if FE want to use it (= dpcm_merged_format)
1702          */
1703
1704         for_each_dpcm_be(fe, stream, dpcm) {
1705                 struct snd_soc_pcm_runtime *be = dpcm->be;
1706                 struct snd_soc_pcm_stream *codec_stream;
1707                 int i;
1708
1709                 for_each_rtd_codec_dais(be, i, dai) {
1710                         /*
1711                          * Skip CODECs which don't support the current stream
1712                          * type. See soc_pcm_init_runtime_hw() for more details
1713                          */
1714                         if (!snd_soc_dai_stream_valid(dai, stream))
1715                                 continue;
1716
1717                         codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1718
1719                         soc_pcm_hw_update_format(hw, codec_stream);
1720                 }
1721         }
1722 }
1723
1724 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
1725 {
1726         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1727         struct snd_pcm_runtime *runtime = substream->runtime;
1728         struct snd_pcm_hardware *hw = &runtime->hw;
1729         struct snd_soc_dpcm *dpcm;
1730         int stream = substream->stream;
1731
1732         if (!fe->dai_link->dpcm_merged_chan)
1733                 return;
1734
1735         /*
1736          * It returns merged BE codec channel;
1737          * if FE want to use it (= dpcm_merged_chan)
1738          */
1739
1740         for_each_dpcm_be(fe, stream, dpcm) {
1741                 struct snd_soc_pcm_runtime *be = dpcm->be;
1742                 struct snd_soc_pcm_stream *cpu_stream;
1743                 struct snd_soc_dai *dai;
1744                 int i;
1745
1746                 for_each_rtd_cpu_dais(be, i, dai) {
1747                         /*
1748                          * Skip CPUs which don't support the current stream
1749                          * type. See soc_pcm_init_runtime_hw() for more details
1750                          */
1751                         if (!snd_soc_dai_stream_valid(dai, stream))
1752                                 continue;
1753
1754                         cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1755
1756                         soc_pcm_hw_update_chan(hw, cpu_stream);
1757                 }
1758
1759                 /*
1760                  * chan min/max cannot be enforced if there are multiple CODEC
1761                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1762                  */
1763                 if (be->dai_link->num_codecs == 1) {
1764                         struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
1765                                 asoc_rtd_to_codec(be, 0), stream);
1766
1767                         soc_pcm_hw_update_chan(hw, codec_stream);
1768                 }
1769         }
1770 }
1771
1772 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
1773 {
1774         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1775         struct snd_pcm_runtime *runtime = substream->runtime;
1776         struct snd_pcm_hardware *hw = &runtime->hw;
1777         struct snd_soc_dpcm *dpcm;
1778         int stream = substream->stream;
1779
1780         if (!fe->dai_link->dpcm_merged_rate)
1781                 return;
1782
1783         /*
1784          * It returns merged BE codec channel;
1785          * if FE want to use it (= dpcm_merged_chan)
1786          */
1787
1788         for_each_dpcm_be(fe, stream, dpcm) {
1789                 struct snd_soc_pcm_runtime *be = dpcm->be;
1790                 struct snd_soc_pcm_stream *pcm;
1791                 struct snd_soc_dai *dai;
1792                 int i;
1793
1794                 for_each_rtd_dais(be, i, dai) {
1795                         /*
1796                          * Skip DAIs which don't support the current stream
1797                          * type. See soc_pcm_init_runtime_hw() for more details
1798                          */
1799                         if (!snd_soc_dai_stream_valid(dai, stream))
1800                                 continue;
1801
1802                         pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1803
1804                         soc_pcm_hw_update_rate(hw, pcm);
1805                 }
1806         }
1807 }
1808
1809 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1810                                int stream)
1811 {
1812         struct snd_soc_dpcm *dpcm;
1813         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1814         struct snd_soc_dai *fe_cpu_dai;
1815         int err = 0;
1816         int i;
1817
1818         /* apply symmetry for FE */
1819         soc_pcm_update_symmetry(fe_substream);
1820
1821         for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1822                 /* Symmetry only applies if we've got an active stream. */
1823                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1824                 if (err < 0)
1825                         goto error;
1826         }
1827
1828         /* apply symmetry for BE */
1829         for_each_dpcm_be(fe, stream, dpcm) {
1830                 struct snd_soc_pcm_runtime *be = dpcm->be;
1831                 struct snd_pcm_substream *be_substream =
1832                         snd_soc_dpcm_get_substream(be, stream);
1833                 struct snd_soc_pcm_runtime *rtd;
1834                 struct snd_soc_dai *dai;
1835
1836                 /* A backend may not have the requested substream */
1837                 if (!be_substream)
1838                         continue;
1839
1840                 rtd = asoc_substream_to_rtd(be_substream);
1841                 if (rtd->dai_link->be_hw_params_fixup)
1842                         continue;
1843
1844                 soc_pcm_update_symmetry(be_substream);
1845
1846                 /* Symmetry only applies if we've got an active stream. */
1847                 for_each_rtd_dais(rtd, i, dai) {
1848                         err = soc_pcm_apply_symmetry(fe_substream, dai);
1849                         if (err < 0)
1850                                 goto error;
1851                 }
1852         }
1853 error:
1854         return soc_pcm_ret(fe, err);
1855 }
1856
1857 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1858 {
1859         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1860         int stream = fe_substream->stream, ret = 0;
1861
1862         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1863
1864         ret = dpcm_be_dai_startup(fe, stream);
1865         if (ret < 0)
1866                 goto be_err;
1867
1868         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1869
1870         /* start the DAI frontend */
1871         ret = __soc_pcm_open(fe, fe_substream);
1872         if (ret < 0)
1873                 goto unwind;
1874
1875         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1876
1877         dpcm_runtime_setup_fe(fe_substream);
1878
1879         dpcm_runtime_setup_be_format(fe_substream);
1880         dpcm_runtime_setup_be_chan(fe_substream);
1881         dpcm_runtime_setup_be_rate(fe_substream);
1882
1883         ret = dpcm_apply_symmetry(fe_substream, stream);
1884
1885 unwind:
1886         if (ret < 0)
1887                 dpcm_be_dai_startup_unwind(fe, stream);
1888 be_err:
1889         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1890
1891         return soc_pcm_ret(fe, ret);
1892 }
1893
1894 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1895 {
1896         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1897         int stream = substream->stream;
1898
1899         snd_soc_dpcm_mutex_assert_held(fe);
1900
1901         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1902
1903         /* shutdown the BEs */
1904         dpcm_be_dai_shutdown(fe, stream);
1905
1906         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1907
1908         /* now shutdown the frontend */
1909         __soc_pcm_close(fe, substream);
1910
1911         /* run the stream stop event */
1912         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1913
1914         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1915         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1916         return 0;
1917 }
1918
1919 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1920 {
1921         struct snd_soc_dpcm *dpcm;
1922
1923         /* only hw_params backends that are either sinks or sources
1924          * to this frontend DAI */
1925         for_each_dpcm_be(fe, stream, dpcm) {
1926
1927                 struct snd_soc_pcm_runtime *be = dpcm->be;
1928                 struct snd_pcm_substream *be_substream =
1929                         snd_soc_dpcm_get_substream(be, stream);
1930
1931                 /* is this op for this BE ? */
1932                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1933                         continue;
1934
1935                 /* only free hw when no longer used - check all FEs */
1936                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1937                                 continue;
1938
1939                 /* do not free hw if this BE is used by other FE */
1940                 if (be->dpcm[stream].users > 1)
1941                         continue;
1942
1943                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1944                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1945                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1946                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1947                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1948                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1949                         continue;
1950
1951                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1952                         be->dai_link->name);
1953
1954                 __soc_pcm_hw_free(be, be_substream);
1955
1956                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1957         }
1958 }
1959
1960 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1961 {
1962         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1963         int stream = substream->stream;
1964
1965         snd_soc_dpcm_mutex_lock(fe);
1966         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1967
1968         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1969
1970         /* call hw_free on the frontend */
1971         soc_pcm_hw_clean(fe, substream, 0);
1972
1973         /* only hw_params backends that are either sinks or sources
1974          * to this frontend DAI */
1975         dpcm_be_dai_hw_free(fe, stream);
1976
1977         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1978         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1979
1980         snd_soc_dpcm_mutex_unlock(fe);
1981         return 0;
1982 }
1983
1984 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1985 {
1986         struct snd_soc_pcm_runtime *be;
1987         struct snd_pcm_substream *be_substream;
1988         struct snd_soc_dpcm *dpcm;
1989         int ret;
1990
1991         for_each_dpcm_be(fe, stream, dpcm) {
1992                 struct snd_pcm_hw_params hw_params;
1993
1994                 be = dpcm->be;
1995                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1996
1997                 /* is this op for this BE ? */
1998                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1999                         continue;
2000
2001                 /* copy params for each dpcm */
2002                 memcpy(&hw_params, &fe->dpcm[stream].hw_params,
2003                                 sizeof(struct snd_pcm_hw_params));
2004
2005                 /* perform any hw_params fixups */
2006                 ret = snd_soc_link_be_hw_params_fixup(be, &hw_params);
2007                 if (ret < 0)
2008                         goto unwind;
2009
2010                 /* copy the fixed-up hw params for BE dai */
2011                 memcpy(&be->dpcm[stream].hw_params, &hw_params,
2012                        sizeof(struct snd_pcm_hw_params));
2013
2014                 /* only allow hw_params() if no connected FEs are running */
2015                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2016                         continue;
2017
2018                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2019                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2020                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2021                         continue;
2022
2023                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2024                         be->dai_link->name);
2025
2026                 ret = __soc_pcm_hw_params(be, be_substream, &hw_params);
2027                 if (ret < 0)
2028                         goto unwind;
2029
2030                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2031         }
2032         return 0;
2033
2034 unwind:
2035         dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2036                 __func__, be->dai_link->name, ret);
2037
2038         /* disable any enabled and non active backends */
2039         for_each_dpcm_be_rollback(fe, stream, dpcm) {
2040                 be = dpcm->be;
2041                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2042
2043                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2044                         continue;
2045
2046                 /* only allow hw_free() if no connected FEs are running */
2047                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2048                         continue;
2049
2050                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2051                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2052                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2053                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2054                         continue;
2055
2056                 __soc_pcm_hw_free(be, be_substream);
2057         }
2058
2059         return ret;
2060 }
2061
2062 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2063                                  struct snd_pcm_hw_params *params)
2064 {
2065         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2066         int ret, stream = substream->stream;
2067
2068         snd_soc_dpcm_mutex_lock(fe);
2069         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2070
2071         memcpy(&fe->dpcm[stream].hw_params, params,
2072                         sizeof(struct snd_pcm_hw_params));
2073         ret = dpcm_be_dai_hw_params(fe, stream);
2074         if (ret < 0)
2075                 goto out;
2076
2077         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2078                         fe->dai_link->name, params_rate(params),
2079                         params_channels(params), params_format(params));
2080
2081         /* call hw_params on the frontend */
2082         ret = __soc_pcm_hw_params(fe, substream, params);
2083         if (ret < 0)
2084                 dpcm_be_dai_hw_free(fe, stream);
2085         else
2086                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2087
2088 out:
2089         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2090         snd_soc_dpcm_mutex_unlock(fe);
2091
2092         return soc_pcm_ret(fe, ret);
2093 }
2094
2095 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2096                                int cmd)
2097 {
2098         struct snd_soc_pcm_runtime *be;
2099         bool pause_stop_transition;
2100         struct snd_soc_dpcm *dpcm;
2101         unsigned long flags;
2102         int ret = 0;
2103
2104         for_each_dpcm_be(fe, stream, dpcm) {
2105                 struct snd_pcm_substream *be_substream;
2106
2107                 be = dpcm->be;
2108                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2109
2110                 snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
2111
2112                 /* is this op for this BE ? */
2113                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2114                         goto next;
2115
2116                 dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
2117                         be->dai_link->name, cmd);
2118
2119                 switch (cmd) {
2120                 case SNDRV_PCM_TRIGGER_START:
2121                         if (!be->dpcm[stream].be_start &&
2122                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2123                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2124                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2125                                 goto next;
2126
2127                         be->dpcm[stream].be_start++;
2128                         if (be->dpcm[stream].be_start != 1)
2129                                 goto next;
2130
2131                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
2132                                 ret = soc_pcm_trigger(be_substream,
2133                                                       SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
2134                         else
2135                                 ret = soc_pcm_trigger(be_substream,
2136                                                       SNDRV_PCM_TRIGGER_START);
2137                         if (ret) {
2138                                 be->dpcm[stream].be_start--;
2139                                 goto next;
2140                         }
2141
2142                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2143                         break;
2144                 case SNDRV_PCM_TRIGGER_RESUME:
2145                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2146                                 goto next;
2147
2148                         be->dpcm[stream].be_start++;
2149                         if (be->dpcm[stream].be_start != 1)
2150                                 goto next;
2151
2152                         ret = soc_pcm_trigger(be_substream, cmd);
2153                         if (ret) {
2154                                 be->dpcm[stream].be_start--;
2155                                 goto next;
2156                         }
2157
2158                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2159                         break;
2160                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2161                         if (!be->dpcm[stream].be_start &&
2162                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2163                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2164                                 goto next;
2165
2166                         fe->dpcm[stream].fe_pause = false;
2167                         be->dpcm[stream].be_pause--;
2168
2169                         be->dpcm[stream].be_start++;
2170                         if (be->dpcm[stream].be_start != 1)
2171                                 goto next;
2172
2173                         ret = soc_pcm_trigger(be_substream, cmd);
2174                         if (ret) {
2175                                 be->dpcm[stream].be_start--;
2176                                 goto next;
2177                         }
2178
2179                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2180                         break;
2181                 case SNDRV_PCM_TRIGGER_STOP:
2182                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2183                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2184                                 goto next;
2185
2186                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2187                                 be->dpcm[stream].be_start--;
2188
2189                         if (be->dpcm[stream].be_start != 0)
2190                                 goto next;
2191
2192                         pause_stop_transition = false;
2193                         if (fe->dpcm[stream].fe_pause) {
2194                                 pause_stop_transition = true;
2195                                 fe->dpcm[stream].fe_pause = false;
2196                                 be->dpcm[stream].be_pause--;
2197                         }
2198
2199                         if (be->dpcm[stream].be_pause != 0)
2200                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
2201                         else
2202                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
2203
2204                         if (ret) {
2205                                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2206                                         be->dpcm[stream].be_start++;
2207                                 if (pause_stop_transition) {
2208                                         fe->dpcm[stream].fe_pause = true;
2209                                         be->dpcm[stream].be_pause++;
2210                                 }
2211                                 goto next;
2212                         }
2213
2214                         if (be->dpcm[stream].be_pause != 0)
2215                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2216                         else
2217                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2218
2219                         break;
2220                 case SNDRV_PCM_TRIGGER_SUSPEND:
2221                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2222                                 goto next;
2223
2224                         be->dpcm[stream].be_start--;
2225                         if (be->dpcm[stream].be_start != 0)
2226                                 goto next;
2227
2228                         ret = soc_pcm_trigger(be_substream, cmd);
2229                         if (ret) {
2230                                 be->dpcm[stream].be_start++;
2231                                 goto next;
2232                         }
2233
2234                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2235                         break;
2236                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2237                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2238                                 goto next;
2239
2240                         fe->dpcm[stream].fe_pause = true;
2241                         be->dpcm[stream].be_pause++;
2242
2243                         be->dpcm[stream].be_start--;
2244                         if (be->dpcm[stream].be_start != 0)
2245                                 goto next;
2246
2247                         ret = soc_pcm_trigger(be_substream, cmd);
2248                         if (ret) {
2249                                 be->dpcm[stream].be_start++;
2250                                 goto next;
2251                         }
2252
2253                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2254                         break;
2255                 }
2256 next:
2257                 snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
2258                 if (ret)
2259                         break;
2260         }
2261         return soc_pcm_ret(fe, ret);
2262 }
2263 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2264
2265 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2266                                   int cmd, bool fe_first)
2267 {
2268         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2269         int ret;
2270
2271         /* call trigger on the frontend before the backend. */
2272         if (fe_first) {
2273                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2274                         fe->dai_link->name, cmd);
2275
2276                 ret = soc_pcm_trigger(substream, cmd);
2277                 if (ret < 0)
2278                         return ret;
2279
2280                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2281                 return ret;
2282         }
2283
2284         /* call trigger on the frontend after the backend. */
2285         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2286         if (ret < 0)
2287                 return ret;
2288
2289         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2290                 fe->dai_link->name, cmd);
2291
2292         ret = soc_pcm_trigger(substream, cmd);
2293
2294         return ret;
2295 }
2296
2297 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2298 {
2299         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2300         int stream = substream->stream;
2301         int ret = 0;
2302         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2303
2304         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2305
2306         switch (trigger) {
2307         case SND_SOC_DPCM_TRIGGER_PRE:
2308                 switch (cmd) {
2309                 case SNDRV_PCM_TRIGGER_START:
2310                 case SNDRV_PCM_TRIGGER_RESUME:
2311                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2312                 case SNDRV_PCM_TRIGGER_DRAIN:
2313                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2314                         break;
2315                 case SNDRV_PCM_TRIGGER_STOP:
2316                 case SNDRV_PCM_TRIGGER_SUSPEND:
2317                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2318                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2319                         break;
2320                 default:
2321                         ret = -EINVAL;
2322                         break;
2323                 }
2324                 break;
2325         case SND_SOC_DPCM_TRIGGER_POST:
2326                 switch (cmd) {
2327                 case SNDRV_PCM_TRIGGER_START:
2328                 case SNDRV_PCM_TRIGGER_RESUME:
2329                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2330                 case SNDRV_PCM_TRIGGER_DRAIN:
2331                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2332                         break;
2333                 case SNDRV_PCM_TRIGGER_STOP:
2334                 case SNDRV_PCM_TRIGGER_SUSPEND:
2335                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2336                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2337                         break;
2338                 default:
2339                         ret = -EINVAL;
2340                         break;
2341                 }
2342                 break;
2343         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2344                 /* bespoke trigger() - handles both FE and BEs */
2345
2346                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2347                                 fe->dai_link->name, cmd);
2348
2349                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2350                 break;
2351         default:
2352                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2353                                 fe->dai_link->name);
2354                 ret = -EINVAL;
2355                 goto out;
2356         }
2357
2358         if (ret < 0) {
2359                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2360                         cmd, ret);
2361                 goto out;
2362         }
2363
2364         switch (cmd) {
2365         case SNDRV_PCM_TRIGGER_START:
2366         case SNDRV_PCM_TRIGGER_RESUME:
2367         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2368                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2369                 break;
2370         case SNDRV_PCM_TRIGGER_STOP:
2371         case SNDRV_PCM_TRIGGER_SUSPEND:
2372                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2373                 break;
2374         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2375                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2376                 break;
2377         }
2378
2379 out:
2380         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2381         return ret;
2382 }
2383
2384 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2385 {
2386         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2387         int stream = substream->stream;
2388
2389         /* if FE's runtime_update is already set, we're in race;
2390          * process this trigger later at exit
2391          */
2392         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2393                 fe->dpcm[stream].trigger_pending = cmd + 1;
2394                 return 0; /* delayed, assuming it's successful */
2395         }
2396
2397         /* we're alone, let's trigger */
2398         return dpcm_fe_dai_do_trigger(substream, cmd);
2399 }
2400
2401 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2402 {
2403         struct snd_soc_dpcm *dpcm;
2404         int ret = 0;
2405
2406         for_each_dpcm_be(fe, stream, dpcm) {
2407
2408                 struct snd_soc_pcm_runtime *be = dpcm->be;
2409                 struct snd_pcm_substream *be_substream =
2410                         snd_soc_dpcm_get_substream(be, stream);
2411
2412                 /* is this op for this BE ? */
2413                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2414                         continue;
2415
2416                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2417                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2418                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2419                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2420                         continue;
2421
2422                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2423                         be->dai_link->name);
2424
2425                 ret = __soc_pcm_prepare(be, be_substream);
2426                 if (ret < 0)
2427                         break;
2428
2429                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2430         }
2431
2432         return soc_pcm_ret(fe, ret);
2433 }
2434
2435 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2436 {
2437         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2438         int stream = substream->stream, ret = 0;
2439
2440         snd_soc_dpcm_mutex_lock(fe);
2441
2442         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2443
2444         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2445
2446         /* there is no point preparing this FE if there are no BEs */
2447         if (list_empty(&fe->dpcm[stream].be_clients)) {
2448                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2449                                 fe->dai_link->name);
2450                 ret = -EINVAL;
2451                 goto out;
2452         }
2453
2454         ret = dpcm_be_dai_prepare(fe, stream);
2455         if (ret < 0)
2456                 goto out;
2457
2458         /* call prepare on the frontend */
2459         ret = __soc_pcm_prepare(fe, substream);
2460         if (ret < 0)
2461                 goto out;
2462
2463         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2464
2465 out:
2466         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2467         snd_soc_dpcm_mutex_unlock(fe);
2468
2469         return soc_pcm_ret(fe, ret);
2470 }
2471
2472 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2473 {
2474         struct snd_pcm_substream *substream =
2475                 snd_soc_dpcm_get_substream(fe, stream);
2476         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2477         int err;
2478
2479         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2480                         stream ? "capture" : "playback", fe->dai_link->name);
2481
2482         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2483                 /* call bespoke trigger - FE takes care of all BE triggers */
2484                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2485                                 fe->dai_link->name);
2486
2487                 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2488         } else {
2489                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2490                         fe->dai_link->name);
2491
2492                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2493         }
2494
2495         dpcm_be_dai_hw_free(fe, stream);
2496
2497         dpcm_be_dai_shutdown(fe, stream);
2498
2499         /* run the stream event for each BE */
2500         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2501
2502         return soc_pcm_ret(fe, err);
2503 }
2504
2505 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2506 {
2507         struct snd_pcm_substream *substream =
2508                 snd_soc_dpcm_get_substream(fe, stream);
2509         struct snd_soc_dpcm *dpcm;
2510         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2511         int ret = 0;
2512
2513         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2514                         stream ? "capture" : "playback", fe->dai_link->name);
2515
2516         /* Only start the BE if the FE is ready */
2517         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2518                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
2519                 dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
2520                         fe->dai_link->name, fe->dpcm[stream].state);
2521                 ret = -EINVAL;
2522                 goto disconnect;
2523         }
2524
2525         /* startup must always be called for new BEs */
2526         ret = dpcm_be_dai_startup(fe, stream);
2527         if (ret < 0)
2528                 goto disconnect;
2529
2530         /* keep going if FE state is > open */
2531         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2532                 return 0;
2533
2534         ret = dpcm_be_dai_hw_params(fe, stream);
2535         if (ret < 0)
2536                 goto close;
2537
2538         /* keep going if FE state is > hw_params */
2539         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2540                 return 0;
2541
2542         ret = dpcm_be_dai_prepare(fe, stream);
2543         if (ret < 0)
2544                 goto hw_free;
2545
2546         /* run the stream event for each BE */
2547         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2548
2549         /* keep going if FE state is > prepare */
2550         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2551                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2552                 return 0;
2553
2554         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2555                 /* call trigger on the frontend - FE takes care of all BE triggers */
2556                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2557                                 fe->dai_link->name);
2558
2559                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2560                 if (ret < 0)
2561                         goto hw_free;
2562         } else {
2563                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2564                         fe->dai_link->name);
2565
2566                 ret = dpcm_be_dai_trigger(fe, stream,
2567                                         SNDRV_PCM_TRIGGER_START);
2568                 if (ret < 0)
2569                         goto hw_free;
2570         }
2571
2572         return 0;
2573
2574 hw_free:
2575         dpcm_be_dai_hw_free(fe, stream);
2576 close:
2577         dpcm_be_dai_shutdown(fe, stream);
2578 disconnect:
2579         /* disconnect any pending BEs */
2580         for_each_dpcm_be(fe, stream, dpcm) {
2581                 struct snd_soc_pcm_runtime *be = dpcm->be;
2582
2583                 /* is this op for this BE ? */
2584                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2585                         continue;
2586
2587                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
2588                         be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
2589                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2590         }
2591
2592         return soc_pcm_ret(fe, ret);
2593 }
2594
2595 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2596 {
2597         struct snd_soc_dapm_widget_list *list;
2598         int stream;
2599         int count, paths;
2600
2601         if (!fe->dai_link->dynamic)
2602                 return 0;
2603
2604         if (fe->dai_link->num_cpus > 1) {
2605                 dev_err(fe->dev,
2606                         "%s doesn't support Multi CPU yet\n", __func__);
2607                 return -EINVAL;
2608         }
2609
2610         /* only check active links */
2611         if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
2612                 return 0;
2613
2614         /* DAPM sync will call this to update DSP paths */
2615         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2616                 new ? "new" : "old", fe->dai_link->name);
2617
2618         for_each_pcm_streams(stream) {
2619
2620                 /* skip if FE doesn't have playback/capture capability */
2621                 if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
2622                     !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
2623                         continue;
2624
2625                 /* skip if FE isn't currently playing/capturing */
2626                 if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
2627                     !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
2628                         continue;
2629
2630                 paths = dpcm_path_get(fe, stream, &list);
2631                 if (paths < 0)
2632                         return paths;
2633
2634                 /* update any playback/capture paths */
2635                 count = dpcm_process_paths(fe, stream, &list, new);
2636                 if (count) {
2637                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2638                         if (new)
2639                                 dpcm_run_update_startup(fe, stream);
2640                         else
2641                                 dpcm_run_update_shutdown(fe, stream);
2642                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2643
2644                         dpcm_clear_pending_state(fe, stream);
2645                         dpcm_be_disconnect(fe, stream);
2646                 }
2647
2648                 dpcm_path_put(&list);
2649         }
2650
2651         return 0;
2652 }
2653
2654 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2655  * any DAI links.
2656  */
2657 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2658 {
2659         struct snd_soc_pcm_runtime *fe;
2660         int ret = 0;
2661
2662         mutex_lock_nested(&card->pcm_mutex, card->pcm_subclass);
2663         /* shutdown all old paths first */
2664         for_each_card_rtds(card, fe) {
2665                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2666                 if (ret)
2667                         goto out;
2668         }
2669
2670         /* bring new paths up */
2671         for_each_card_rtds(card, fe) {
2672                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2673                 if (ret)
2674                         goto out;
2675         }
2676
2677 out:
2678         mutex_unlock(&card->pcm_mutex);
2679         return ret;
2680 }
2681 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2682
2683 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2684 {
2685         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2686         struct snd_soc_dpcm *dpcm;
2687         int stream = fe_substream->stream;
2688
2689         snd_soc_dpcm_mutex_assert_held(fe);
2690
2691         /* mark FE's links ready to prune */
2692         for_each_dpcm_be(fe, stream, dpcm)
2693                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2694
2695         dpcm_be_disconnect(fe, stream);
2696
2697         fe->dpcm[stream].runtime = NULL;
2698 }
2699
2700 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2701 {
2702         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2703         int ret;
2704
2705         snd_soc_dpcm_mutex_lock(fe);
2706         ret = dpcm_fe_dai_shutdown(fe_substream);
2707
2708         dpcm_fe_dai_cleanup(fe_substream);
2709
2710         snd_soc_dpcm_mutex_unlock(fe);
2711         return ret;
2712 }
2713
2714 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2715 {
2716         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2717         struct snd_soc_dapm_widget_list *list;
2718         int ret;
2719         int stream = fe_substream->stream;
2720
2721         snd_soc_dpcm_mutex_lock(fe);
2722         fe->dpcm[stream].runtime = fe_substream->runtime;
2723
2724         ret = dpcm_path_get(fe, stream, &list);
2725         if (ret < 0)
2726                 goto open_end;
2727
2728         /* calculate valid and active FE <-> BE dpcms */
2729         dpcm_process_paths(fe, stream, &list, 1);
2730
2731         ret = dpcm_fe_dai_startup(fe_substream);
2732         if (ret < 0)
2733                 dpcm_fe_dai_cleanup(fe_substream);
2734
2735         dpcm_clear_pending_state(fe, stream);
2736         dpcm_path_put(&list);
2737 open_end:
2738         snd_soc_dpcm_mutex_unlock(fe);
2739         return ret;
2740 }
2741
2742 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
2743                                     int *playback, int *capture)
2744 {
2745         struct snd_soc_dai *cpu_dai;
2746         int i;
2747
2748         if (rtd->dai_link->dynamic && rtd->dai_link->num_cpus > 1) {
2749                 dev_err(rtd->dev,
2750                         "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2751                 return -EINVAL;
2752         }
2753
2754         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2755                 int stream;
2756
2757                 if (rtd->dai_link->dpcm_playback) {
2758                         stream = SNDRV_PCM_STREAM_PLAYBACK;
2759
2760                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2761                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2762                                         *playback = 1;
2763                                         break;
2764                                 }
2765                         }
2766                         if (!*playback) {
2767                                 dev_err(rtd->card->dev,
2768                                         "No CPU DAIs support playback for stream %s\n",
2769                                         rtd->dai_link->stream_name);
2770                                 return -EINVAL;
2771                         }
2772                 }
2773                 if (rtd->dai_link->dpcm_capture) {
2774                         stream = SNDRV_PCM_STREAM_CAPTURE;
2775
2776                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2777                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2778                                         *capture = 1;
2779                                         break;
2780                                 }
2781                         }
2782
2783                         if (!*capture) {
2784                                 dev_err(rtd->card->dev,
2785                                         "No CPU DAIs support capture for stream %s\n",
2786                                         rtd->dai_link->stream_name);
2787                                 return -EINVAL;
2788                         }
2789                 }
2790         } else {
2791                 struct snd_soc_dai *codec_dai;
2792
2793                 /* Adapt stream for codec2codec links */
2794                 int cpu_capture = rtd->dai_link->params ?
2795                         SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
2796                 int cpu_playback = rtd->dai_link->params ?
2797                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2798
2799                 for_each_rtd_codec_dais(rtd, i, codec_dai) {
2800                         if (rtd->dai_link->num_cpus == 1) {
2801                                 cpu_dai = asoc_rtd_to_cpu(rtd, 0);
2802                         } else if (rtd->dai_link->num_cpus == rtd->dai_link->num_codecs) {
2803                                 cpu_dai = asoc_rtd_to_cpu(rtd, i);
2804                         } else {
2805                                 dev_err(rtd->card->dev,
2806                                         "N cpus to M codecs link is not supported yet\n");
2807                                 return -EINVAL;
2808                         }
2809
2810                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2811                             snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2812                                 *playback = 1;
2813                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2814                             snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2815                                 *capture = 1;
2816                 }
2817         }
2818
2819         if (rtd->dai_link->playback_only) {
2820                 *playback = 1;
2821                 *capture = 0;
2822         }
2823
2824         if (rtd->dai_link->capture_only) {
2825                 *playback = 0;
2826                 *capture = 1;
2827         }
2828
2829         return 0;
2830 }
2831
2832 static int soc_create_pcm(struct snd_pcm **pcm,
2833                           struct snd_soc_pcm_runtime *rtd,
2834                           int playback, int capture, int num)
2835 {
2836         char new_name[64];
2837         int ret;
2838
2839         /* create the PCM */
2840         if (rtd->dai_link->params) {
2841                 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2842                          rtd->dai_link->stream_name);
2843
2844                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2845                                            playback, capture, pcm);
2846         } else if (rtd->dai_link->no_pcm) {
2847                 snprintf(new_name, sizeof(new_name), "(%s)",
2848                         rtd->dai_link->stream_name);
2849
2850                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2851                                 playback, capture, pcm);
2852         } else {
2853                 if (rtd->dai_link->dynamic)
2854                         snprintf(new_name, sizeof(new_name), "%s (*)",
2855                                 rtd->dai_link->stream_name);
2856                 else
2857                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2858                                 rtd->dai_link->stream_name,
2859                                 soc_codec_dai_name(rtd), num);
2860
2861                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2862                         capture, pcm);
2863         }
2864         if (ret < 0) {
2865                 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2866                         new_name, rtd->dai_link->name, ret);
2867                 return ret;
2868         }
2869         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2870
2871         return 0;
2872 }
2873
2874 /* create a new pcm */
2875 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2876 {
2877         struct snd_soc_component *component;
2878         struct snd_pcm *pcm;
2879         int ret = 0, playback = 0, capture = 0;
2880         int i;
2881
2882         ret = soc_get_playback_capture(rtd, &playback, &capture);
2883         if (ret < 0)
2884                 return ret;
2885
2886         ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
2887         if (ret < 0)
2888                 return ret;
2889
2890         /* DAPM dai link stream work */
2891         /*
2892          * Currently nothing to do for c2c links
2893          * Since c2c links are internal nodes in the DAPM graph and
2894          * don't interface with the outside world or application layer
2895          * we don't have to do any special handling on close.
2896          */
2897         if (!rtd->dai_link->params)
2898                 rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2899
2900         rtd->pcm = pcm;
2901         pcm->nonatomic = rtd->dai_link->nonatomic;
2902         pcm->private_data = rtd;
2903         pcm->no_device_suspend = true;
2904
2905         if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
2906                 if (playback)
2907                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2908                 if (capture)
2909                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2910                 goto out;
2911         }
2912
2913         /* ASoC PCM operations */
2914         if (rtd->dai_link->dynamic) {
2915                 rtd->ops.open           = dpcm_fe_dai_open;
2916                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2917                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2918                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2919                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2920                 rtd->ops.close          = dpcm_fe_dai_close;
2921                 rtd->ops.pointer        = soc_pcm_pointer;
2922         } else {
2923                 rtd->ops.open           = soc_pcm_open;
2924                 rtd->ops.hw_params      = soc_pcm_hw_params;
2925                 rtd->ops.prepare        = soc_pcm_prepare;
2926                 rtd->ops.trigger        = soc_pcm_trigger;
2927                 rtd->ops.hw_free        = soc_pcm_hw_free;
2928                 rtd->ops.close          = soc_pcm_close;
2929                 rtd->ops.pointer        = soc_pcm_pointer;
2930         }
2931
2932         for_each_rtd_components(rtd, i, component) {
2933                 const struct snd_soc_component_driver *drv = component->driver;
2934
2935                 if (drv->ioctl)
2936                         rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2937                 if (drv->sync_stop)
2938                         rtd->ops.sync_stop      = snd_soc_pcm_component_sync_stop;
2939                 if (drv->copy_user)
2940                         rtd->ops.copy_user      = snd_soc_pcm_component_copy_user;
2941                 if (drv->page)
2942                         rtd->ops.page           = snd_soc_pcm_component_page;
2943                 if (drv->mmap)
2944                         rtd->ops.mmap           = snd_soc_pcm_component_mmap;
2945                 if (drv->ack)
2946                         rtd->ops.ack            = snd_soc_pcm_component_ack;
2947         }
2948
2949         if (playback)
2950                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2951
2952         if (capture)
2953                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2954
2955         ret = snd_soc_pcm_component_new(rtd);
2956         if (ret < 0)
2957                 return ret;
2958 out:
2959         dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
2960                 soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
2961         return ret;
2962 }
2963
2964 /* is the current PCM operation for this FE ? */
2965 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2966 {
2967         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2968                 return 1;
2969         return 0;
2970 }
2971 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2972
2973 /* is the current PCM operation for this BE ? */
2974 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2975                 struct snd_soc_pcm_runtime *be, int stream)
2976 {
2977         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2978            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2979                   be->dpcm[stream].runtime_update))
2980                 return 1;
2981         return 0;
2982 }
2983 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2984
2985 /* get the substream for this BE */
2986 struct snd_pcm_substream *
2987         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2988 {
2989         return be->pcm->streams[stream].substream;
2990 }
2991 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2992
2993 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
2994                                     struct snd_soc_pcm_runtime *be,
2995                                     int stream,
2996                                     const enum snd_soc_dpcm_state *states,
2997                                     int num_states)
2998 {
2999         struct snd_soc_dpcm *dpcm;
3000         int state;
3001         int ret = 1;
3002         int i;
3003
3004         for_each_dpcm_fe(be, stream, dpcm) {
3005
3006                 if (dpcm->fe == fe)
3007                         continue;
3008
3009                 state = dpcm->fe->dpcm[stream].state;
3010                 for (i = 0; i < num_states; i++) {
3011                         if (state == states[i]) {
3012                                 ret = 0;
3013                                 break;
3014                         }
3015                 }
3016         }
3017
3018         /* it's safe to do this BE DAI */
3019         return ret;
3020 }
3021
3022 /*
3023  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3024  * are not running, paused or suspended for the specified stream direction.
3025  */
3026 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3027                 struct snd_soc_pcm_runtime *be, int stream)
3028 {
3029         const enum snd_soc_dpcm_state state[] = {
3030                 SND_SOC_DPCM_STATE_START,
3031                 SND_SOC_DPCM_STATE_PAUSED,
3032                 SND_SOC_DPCM_STATE_SUSPEND,
3033         };
3034
3035         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3036 }
3037 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3038
3039 /*
3040  * We can only change hw params a BE DAI if any of it's FE are not prepared,
3041  * running, paused or suspended for the specified stream direction.
3042  */
3043 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3044                 struct snd_soc_pcm_runtime *be, int stream)
3045 {
3046         const enum snd_soc_dpcm_state state[] = {
3047                 SND_SOC_DPCM_STATE_START,
3048                 SND_SOC_DPCM_STATE_PAUSED,
3049                 SND_SOC_DPCM_STATE_SUSPEND,
3050                 SND_SOC_DPCM_STATE_PREPARE,
3051         };
3052
3053         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3054 }
3055 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);