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