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/slab.h>
  18 #include <linux/workqueue.h>
  19 #include <linux/export.h>
  20 #include <linux/debugfs.h>
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25 #include <sound/soc-dpcm.h>
  26 #include <sound/soc-link.h>
  27 #include <sound/initval.h>
  28
  29 #define soc_pcm_ret(rtd, ret) _soc_pcm_ret(rtd, __func__, ret)
  30 static inline int _soc_pcm_ret(struct snd_soc_pcm_runtime *rtd,
  31                                const char *func, int ret)
  32 {
  33         /* Positive, Zero values are not errors */
  34         if (ret >= 0)
  35                 return ret;
  36
  37         /* Negative values might be errors */
  38         switch (ret) {
  39         case -EPROBE_DEFER:
  40         case -ENOTSUPP:
  41         case -EINVAL:
  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_stream_lock_irq(struct snd_soc_pcm_runtime *rtd,
  53                                                 int stream)
  54 {
  55         snd_pcm_stream_lock_irq(snd_soc_dpcm_get_substream(rtd, stream));
  56 }
  57
  58 #define snd_soc_dpcm_stream_lock_irqsave_nested(rtd, stream, flags) \
  59         snd_pcm_stream_lock_irqsave_nested(snd_soc_dpcm_get_substream(rtd, stream), flags)
  60
  61 static inline void snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime *rtd,
  62                                                   int stream)
  63 {
  64         snd_pcm_stream_unlock_irq(snd_soc_dpcm_get_substream(rtd, stream));
  65 }
  66
  67 #define snd_soc_dpcm_stream_unlock_irqrestore(rtd, stream, flags) \
  68         snd_pcm_stream_unlock_irqrestore(snd_soc_dpcm_get_substream(rtd, stream), flags)
  69
  70 #define DPCM_MAX_BE_USERS       8
  71
  72 static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd)
  73 {
  74         return (rtd)->dai_link->num_cpus == 1 ? snd_soc_rtd_to_cpu(rtd, 0)->name : "multicpu";
  75 }
  76 static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd)
  77 {
  78         return (rtd)->dai_link->num_codecs == 1 ? snd_soc_rtd_to_codec(rtd, 0)->name : "multicodec";
  79 }
  80
  81 #ifdef CONFIG_DEBUG_FS
  82 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
  83 {
  84         switch (state) {
  85         case SND_SOC_DPCM_STATE_NEW:
  86                 return "new";
  87         case SND_SOC_DPCM_STATE_OPEN:
  88                 return "open";
  89         case SND_SOC_DPCM_STATE_HW_PARAMS:
  90                 return "hw_params";
  91         case SND_SOC_DPCM_STATE_PREPARE:
  92                 return "prepare";
  93         case SND_SOC_DPCM_STATE_START:
  94                 return "start";
  95         case SND_SOC_DPCM_STATE_STOP:
  96                 return "stop";
  97         case SND_SOC_DPCM_STATE_SUSPEND:
  98                 return "suspend";
  99         case SND_SOC_DPCM_STATE_PAUSED:
 100                 return "paused";
 101         case SND_SOC_DPCM_STATE_HW_FREE:
 102                 return "hw_free";
 103         case SND_SOC_DPCM_STATE_CLOSE:
 104                 return "close";
 105         }
 106
 107         return "unknown";
 108 }
 109
 110 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
 111                                int stream, char *buf, size_t size)
 112 {
 113         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
 114         struct snd_soc_dpcm *dpcm;
 115         ssize_t offset = 0;
 116
 117         /* FE state */
 118         offset += scnprintf(buf + offset, size - offset,
 119                            "[%s - %s]\n", fe->dai_link->name,
 120                            stream ? "Capture" : "Playback");
 121
 122         offset += scnprintf(buf + offset, size - offset, "State: %s\n",
 123                            dpcm_state_string(fe->dpcm[stream].state));
 124
 125         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
 126             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
 127                 offset += scnprintf(buf + offset, size - offset,
 128                                    "Hardware Params: "
 129                                    "Format = %s, Channels = %d, Rate = %d\n",
 130                                    snd_pcm_format_name(params_format(params)),
 131                                    params_channels(params),
 132                                    params_rate(params));
 133
 134         /* BEs state */
 135         offset += scnprintf(buf + offset, size - offset, "Backends:\n");
 136
 137         if (list_empty(&fe->dpcm[stream].be_clients)) {
 138                 offset += scnprintf(buf + offset, size - offset,
 139                                    " No active DSP links\n");
 140                 goto out;
 141         }
 142
 143         for_each_dpcm_be(fe, stream, dpcm) {
 144                 struct snd_soc_pcm_runtime *be = dpcm->be;
 145                 params = &be->dpcm[stream].hw_params;
 146
 147                 offset += scnprintf(buf + offset, size - offset,
 148                                    "- %s\n", be->dai_link->name);
 149
 150                 offset += scnprintf(buf + offset, size - offset,
 151                                    "   State: %s\n",
 152                                    dpcm_state_string(be->dpcm[stream].state));
 153
 154                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
 155                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
 156                         offset += scnprintf(buf + offset, size - offset,
 157                                            "   Hardware Params: "
 158                                            "Format = %s, Channels = %d, Rate = %d\n",
 159                                            snd_pcm_format_name(params_format(params)),
 160                                            params_channels(params),
 161                                            params_rate(params));
 162         }
 163 out:
 164         return offset;
 165 }
 166
 167 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
 168                                     size_t count, loff_t *ppos)
 169 {
 170         struct snd_soc_pcm_runtime *fe = file->private_data;
 171         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
 172         int stream;
 173         char *buf;
 174
 175         if (fe->dai_link->num_cpus > 1) {
 176                 dev_err(fe->dev,
 177                         "%s doesn't support Multi CPU yet\n", __func__);
 178                 return -EINVAL;
 179         }
 180
 181         buf = kmalloc(out_count, GFP_KERNEL);
 182         if (!buf)
 183                 return -ENOMEM;
 184
 185         snd_soc_dpcm_mutex_lock(fe);
 186         for_each_pcm_streams(stream)
 187                 if (snd_soc_dai_stream_valid(snd_soc_rtd_to_cpu(fe, 0), stream))
 188                         offset += dpcm_show_state(fe, stream,
 189                                                   buf + offset,
 190                                                   out_count - offset);
 191         snd_soc_dpcm_mutex_unlock(fe);
 192
 193         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
 194
 195         kfree(buf);
 196         return ret;
 197 }
 198
 199 static const struct file_operations dpcm_state_fops = {
 200         .open = simple_open,
 201         .read = dpcm_state_read_file,
 202         .llseek = default_llseek,
 203 };
 204
 205 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
 206 {
 207         if (!rtd->dai_link->dynamic)
 208                 return;
 209
 210         if (!rtd->card->debugfs_card_root)
 211                 return;
 212
 213         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
 214                                                     rtd->card->debugfs_card_root);
 215
 216         debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
 217                             rtd, &dpcm_state_fops);
 218 }
 219
 220 static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream)
 221 {
 222         char *name;
 223
 224         name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name,
 225                          stream ? "capture" : "playback");
 226         if (name) {
 227                 dpcm->debugfs_state = debugfs_create_dir(
 228                         name, dpcm->fe->debugfs_dpcm_root);
 229                 debugfs_create_u32("state", 0644, dpcm->debugfs_state,
 230                                    &dpcm->state);
 231                 kfree(name);
 232         }
 233 }
 234
 235 static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 236 {
 237         debugfs_remove_recursive(dpcm->debugfs_state);
 238 }
 239
 240 #else
 241 static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
 242                                              int stream)
 243 {
 244 }
 245
 246 static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 247 {
 248 }
 249 #endif
 250
 251 /* Set FE's runtime_update state; the state is protected via PCM stream lock
 252  * for avoiding the race with trigger callback.
 253  * If the state is unset and a trigger is pending while the previous operation,
 254  * process the pending trigger action here.
 255  */
 256 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
 257 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
 258                                      int stream, enum snd_soc_dpcm_update state)
 259 {
 260         struct snd_pcm_substream *substream =
 261                 snd_soc_dpcm_get_substream(fe, stream);
 262
 263         snd_soc_dpcm_stream_lock_irq(fe, stream);
 264         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
 265                 dpcm_fe_dai_do_trigger(substream,
 266                                        fe->dpcm[stream].trigger_pending - 1);
 267                 fe->dpcm[stream].trigger_pending = 0;
 268         }
 269         fe->dpcm[stream].runtime_update = state;
 270         snd_soc_dpcm_stream_unlock_irq(fe, stream);
 271 }
 272
 273 static void dpcm_set_be_update_state(struct snd_soc_pcm_runtime *be,
 274                                      int stream, enum snd_soc_dpcm_update state)
 275 {
 276         be->dpcm[stream].runtime_update = state;
 277 }
 278
 279 /**
 280  * snd_soc_runtime_action() - Increment/Decrement active count for
 281  * PCM runtime components
 282  * @rtd: ASoC PCM runtime that is activated
 283  * @stream: Direction of the PCM stream
 284  * @action: Activate stream if 1. Deactivate if -1.
 285  *
 286  * Increments/Decrements the active count for all the DAIs and components
 287  * attached to a PCM runtime.
 288  * Should typically be called when a stream is opened.
 289  *
 290  * Must be called with the rtd->card->pcm_mutex being held
 291  */
 292 void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
 293                             int stream, int action)
 294 {
 295         struct snd_soc_component *component;
 296         struct snd_soc_dai *dai;
 297         int i;
 298
 299         snd_soc_dpcm_mutex_assert_held(rtd);
 300
 301         for_each_rtd_dais(rtd, i, dai)
 302                 snd_soc_dai_action(dai, stream, action);
 303
 304         /* Increments/Decrements the active count for components without DAIs */
 305         for_each_rtd_components(rtd, i, component) {
 306                 if (component->num_dai)
 307                         continue;
 308                 component->active += action;
 309         }
 310 }
 311 EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
 312
 313 /**
 314  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 315  * @rtd: The ASoC PCM runtime that should be checked.
 316  *
 317  * This function checks whether the power down delay should be ignored for a
 318  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 319  * been configured to ignore the delay, or if none of the components benefits
 320  * from having the delay.
 321  */
 322 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 323 {
 324         struct snd_soc_component *component;
 325         bool ignore = true;
 326         int i;
 327
 328         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 329                 return true;
 330
 331         for_each_rtd_components(rtd, i, component)
 332                 ignore &= !component->driver->use_pmdown_time;
 333
 334         return ignore;
 335 }
 336
 337 /**
 338  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 339  * @substream: the pcm substream
 340  * @hw: the hardware parameters
 341  *
 342  * Sets the substream runtime hardware parameters.
 343  */
 344 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 345         const struct snd_pcm_hardware *hw)
 346 {
 347         substream->runtime->hw = *hw;
 348
 349         return 0;
 350 }
 351 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 352
 353 /* DPCM stream event, send event to FE and all active BEs. */
 354 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 355         int event)
 356 {
 357         struct snd_soc_dpcm *dpcm;
 358
 359         snd_soc_dpcm_mutex_assert_held(fe);
 360
 361         for_each_dpcm_be(fe, dir, dpcm) {
 362
 363                 struct snd_soc_pcm_runtime *be = dpcm->be;
 364
 365                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 366                                 be->dai_link->name, event, dir);
 367
 368                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
 369                     (be->dpcm[dir].users >= 1))
 370                         continue;
 371
 372                 snd_soc_dapm_stream_event(be, dir, event);
 373         }
 374
 375         snd_soc_dapm_stream_event(fe, dir, event);
 376
 377         return 0;
 378 }
 379
 380 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
 381                                    struct snd_pcm_hw_params *params)
 382 {
 383         if (params) {
 384                 dai->rate        = params_rate(params);
 385                 dai->channels    = params_channels(params);
 386                 dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
 387         } else {
 388                 dai->rate        = 0;
 389                 dai->channels    = 0;
 390                 dai->sample_bits = 0;
 391         }
 392 }
 393
 394 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 395                                         struct snd_soc_dai *soc_dai)
 396 {
 397         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 398         int ret;
 399
 400         if (!snd_soc_dai_active(soc_dai))
 401                 return 0;
 402
 403 #define __soc_pcm_apply_symmetry(name, NAME)                            \
 404         if (soc_dai->name && (soc_dai->driver->symmetric_##name ||      \
 405                               rtd->dai_link->symmetric_##name)) {       \
 406                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
 407                         #name, soc_dai->name);                          \
 408                                                                         \
 409                 ret = snd_pcm_hw_constraint_single(substream->runtime,  \
 410                                                    SNDRV_PCM_HW_PARAM_##NAME,\
 411                                                    soc_dai->name);      \
 412                 if (ret < 0) {                                          \
 413                         dev_err(soc_dai->dev,                           \
 414                                 "ASoC: Unable to apply %s constraint: %d\n",\
 415                                 #name, ret);                            \
 416                         return ret;                                     \
 417                 }                                                       \
 418         }
 419
 420         __soc_pcm_apply_symmetry(rate,          RATE);
 421         __soc_pcm_apply_symmetry(channels,      CHANNELS);
 422         __soc_pcm_apply_symmetry(sample_bits,   SAMPLE_BITS);
 423
 424         return 0;
 425 }
 426
 427 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 428                                 struct snd_pcm_hw_params *params)
 429 {
 430         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 431         struct snd_soc_dai d;
 432         struct snd_soc_dai *dai;
 433         struct snd_soc_dai *cpu_dai;
 434         unsigned int symmetry, i;
 435
 436         d.name = __func__;
 437         soc_pcm_set_dai_params(&d, params);
 438
 439 #define __soc_pcm_params_symmetry(xxx)                                  \
 440         symmetry = rtd->dai_link->symmetric_##xxx;                      \
 441         for_each_rtd_dais(rtd, i, dai)                                  \
 442                 symmetry |= dai->driver->symmetric_##xxx;               \
 443                                                                         \
 444         if (symmetry)                                                   \
 445                 for_each_rtd_cpu_dais(rtd, i, cpu_dai)                  \
 446                         if (!snd_soc_dai_is_dummy(cpu_dai) &&           \
 447                             cpu_dai->xxx && cpu_dai->xxx != d.xxx) {    \
 448                                 dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
 449                                         #xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
 450                                 return -EINVAL;                         \
 451                         }
 452
 453         /* reject unmatched parameters when applying symmetry */
 454         __soc_pcm_params_symmetry(rate);
 455         __soc_pcm_params_symmetry(channels);
 456         __soc_pcm_params_symmetry(sample_bits);
 457
 458         return 0;
 459 }
 460
 461 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
 462 {
 463         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 464         struct snd_soc_dai_link *link = rtd->dai_link;
 465         struct snd_soc_dai *dai;
 466         unsigned int symmetry, i;
 467
 468         symmetry = link->symmetric_rate ||
 469                 link->symmetric_channels ||
 470                 link->symmetric_sample_bits;
 471
 472         for_each_rtd_dais(rtd, i, dai)
 473                 symmetry = symmetry ||
 474                         dai->driver->symmetric_rate ||
 475                         dai->driver->symmetric_channels ||
 476                         dai->driver->symmetric_sample_bits;
 477
 478         if (symmetry)
 479                 substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 480 }
 481
 482 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 483 {
 484         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 485         int ret;
 486
 487         if (!bits)
 488                 return;
 489
 490         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 491         if (ret != 0)
 492                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 493                                  bits, ret);
 494 }
 495
 496 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 497 {
 498         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 499         struct snd_soc_dai *cpu_dai;
 500         struct snd_soc_dai *codec_dai;
 501         int stream = substream->stream;
 502         int i;
 503         unsigned int bits = 0, cpu_bits = 0;
 504
 505         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 506                 struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 507
 508                 if (pcm_codec->sig_bits == 0) {
 509                         bits = 0;
 510                         break;
 511                 }
 512                 bits = max(pcm_codec->sig_bits, bits);
 513         }
 514
 515         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 516                 struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 517
 518                 if (pcm_cpu->sig_bits == 0) {
 519                         cpu_bits = 0;
 520                         break;
 521                 }
 522                 cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
 523         }
 524
 525         soc_pcm_set_msb(substream, bits);
 526         soc_pcm_set_msb(substream, cpu_bits);
 527 }
 528
 529 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
 530 {
 531         hw->rates               = UINT_MAX;
 532         hw->rate_min            = 0;
 533         hw->rate_max            = UINT_MAX;
 534         hw->channels_min        = 0;
 535         hw->channels_max        = UINT_MAX;
 536         hw->formats             = ULLONG_MAX;
 537 }
 538
 539 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
 540                                    struct snd_soc_pcm_stream *p)
 541 {
 542         hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
 543
 544         /* setup hw->rate_min/max via hw->rates first */
 545         snd_pcm_hw_limit_rates(hw);
 546
 547         /* update hw->rate_min/max by snd_soc_pcm_stream */
 548         hw->rate_min = max(hw->rate_min, p->rate_min);
 549         hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
 550 }
 551
 552 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
 553                                    struct snd_soc_pcm_stream *p)
 554 {
 555         hw->channels_min = max(hw->channels_min, p->channels_min);
 556         hw->channels_max = min(hw->channels_max, p->channels_max);
 557 }
 558
 559 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
 560                                      struct snd_soc_pcm_stream *p)
 561 {
 562         hw->formats &= p->formats;
 563 }
 564
 565 static void soc_pcm_hw_update_subformat(struct snd_pcm_hardware *hw,
 566                                         struct snd_soc_pcm_stream *p)
 567 {
 568         hw->subformats &= p->subformats;
 569 }
 570
 571 /**
 572  * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
 573  * @rtd: ASoC PCM runtime
 574  * @hw: PCM hardware parameters (output)
 575  * @stream: Direction of the PCM stream
 576  *
 577  * Calculates the subset of stream parameters supported by all DAIs
 578  * associated with the PCM stream.
 579  */
 580 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
 581                             struct snd_pcm_hardware *hw, int stream)
 582 {
 583         struct snd_soc_dai *codec_dai;
 584         struct snd_soc_dai *cpu_dai;
 585         struct snd_soc_pcm_stream *codec_stream;
 586         struct snd_soc_pcm_stream *cpu_stream;
 587         unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
 588         int i;
 589
 590         soc_pcm_hw_init(hw);
 591
 592         /* first calculate min/max only for CPUs in the DAI link */
 593         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 594
 595                 /*
 596                  * Skip CPUs which don't support the current stream type.
 597                  * Otherwise, since the rate, channel, and format values will
 598                  * zero in that case, we would have no usable settings left,
 599                  * causing the resulting setup to fail.
 600                  */
 601                 if (!snd_soc_dai_stream_valid(cpu_dai, stream))
 602                         continue;
 603
 604                 cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 605
 606                 soc_pcm_hw_update_chan(hw, cpu_stream);
 607                 soc_pcm_hw_update_rate(hw, cpu_stream);
 608                 soc_pcm_hw_update_format(hw, cpu_stream);
 609                 soc_pcm_hw_update_subformat(hw, cpu_stream);
 610         }
 611         cpu_chan_min = hw->channels_min;
 612         cpu_chan_max = hw->channels_max;
 613
 614         /* second calculate min/max only for CODECs in the DAI link */
 615         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 616
 617                 /*
 618                  * Skip CODECs which don't support the current stream type.
 619                  * Otherwise, since the rate, channel, and format values will
 620                  * zero in that case, we would have no usable settings left,
 621                  * causing the resulting setup to fail.
 622                  */
 623                 if (!snd_soc_dai_stream_valid(codec_dai, stream))
 624                         continue;
 625
 626                 codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 627
 628                 soc_pcm_hw_update_chan(hw, codec_stream);
 629                 soc_pcm_hw_update_rate(hw, codec_stream);
 630                 soc_pcm_hw_update_format(hw, codec_stream);
 631                 soc_pcm_hw_update_subformat(hw, codec_stream);
 632         }
 633
 634         /* Verify both a valid CPU DAI and a valid CODEC DAI were found */
 635         if (!hw->channels_min)
 636                 return -EINVAL;
 637
 638         /*
 639          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 640          * connected to CPU DAI(s), use CPU DAI's directly and let
 641          * channel allocation be fixed up later
 642          */
 643         if (rtd->dai_link->num_codecs > 1) {
 644                 hw->channels_min = cpu_chan_min;
 645                 hw->channels_max = cpu_chan_max;
 646         }
 647
 648         return 0;
 649 }
 650 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
 651
 652 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 653 {
 654         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 655         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 656         u64 formats = hw->formats;
 657
 658         /*
 659          * At least one CPU and one CODEC should match. Otherwise, we should
 660          * have bailed out on a higher level, since there would be no CPU or
 661          * CODEC to support the transfer direction in that case.
 662          */
 663         snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
 664
 665         if (formats)
 666                 hw->formats &= formats;
 667 }
 668
 669 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
 670 {
 671         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 672         struct snd_soc_component *component;
 673         int i, ret = 0;
 674
 675         for_each_rtd_components(rtd, i, component) {
 676                 ret = snd_soc_component_module_get_when_open(component, substream);
 677                 if (ret < 0)
 678                         break;
 679
 680                 ret = snd_soc_component_open(component, substream);
 681                 if (ret < 0)
 682                         break;
 683         }
 684
 685         return ret;
 686 }
 687
 688 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
 689                                     int rollback)
 690 {
 691         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 692         struct snd_soc_component *component;
 693         int i, ret = 0;
 694
 695         for_each_rtd_components(rtd, i, component) {
 696                 int r = snd_soc_component_close(component, substream, rollback);
 697                 if (r < 0)
 698                         ret = r; /* use last ret */
 699
 700                 snd_soc_component_module_put_when_close(component, substream, rollback);
 701         }
 702
 703         return ret;
 704 }
 705
 706 static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
 707                          struct snd_pcm_substream *substream, int rollback)
 708 {
 709         struct snd_soc_component *component;
 710         struct snd_soc_dai *dai;
 711         int i;
 712
 713         snd_soc_dpcm_mutex_assert_held(rtd);
 714
 715         if (!rollback) {
 716                 snd_soc_runtime_deactivate(rtd, substream->stream);
 717
 718                 /* Make sure DAI parameters cleared if the DAI becomes inactive */
 719                 for_each_rtd_dais(rtd, i, dai) {
 720                         if (snd_soc_dai_active(dai) == 0 &&
 721                             (dai->rate || dai->channels || dai->sample_bits))
 722                                 soc_pcm_set_dai_params(dai, NULL);
 723                 }
 724         }
 725
 726         for_each_rtd_dais(rtd, i, dai)
 727                 snd_soc_dai_shutdown(dai, substream, rollback);
 728
 729         snd_soc_link_shutdown(substream, rollback);
 730
 731         soc_pcm_components_close(substream, rollback);
 732
 733         snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
 734
 735         for_each_rtd_components(rtd, i, component)
 736                 if (!snd_soc_component_active(component))
 737                         pinctrl_pm_select_sleep_state(component->dev);
 738
 739         return 0;
 740 }
 741
 742 /*
 743  * Called by ALSA when a PCM substream is closed. Private data can be
 744  * freed here. The cpu DAI, codec DAI, machine and components are also
 745  * shutdown.
 746  */
 747 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
 748                            struct snd_pcm_substream *substream)
 749 {
 750         return soc_pcm_clean(rtd, substream, 0);
 751 }
 752
 753 /* PCM close ops for non-DPCM streams */
 754 static int soc_pcm_close(struct snd_pcm_substream *substream)
 755 {
 756         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 757
 758         snd_soc_dpcm_mutex_lock(rtd);
 759         __soc_pcm_close(rtd, substream);
 760         snd_soc_dpcm_mutex_unlock(rtd);
 761         return 0;
 762 }
 763
 764 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
 765 {
 766         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 767         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 768         const char *name_cpu = soc_cpu_dai_name(rtd);
 769         const char *name_codec = soc_codec_dai_name(rtd);
 770         const char *err_msg;
 771         struct device *dev = rtd->dev;
 772
 773         err_msg = "rates";
 774         if (!hw->rates)
 775                 goto config_err;
 776
 777         err_msg = "formats";
 778         if (!hw->formats)
 779                 goto config_err;
 780
 781         err_msg = "channels";
 782         if (!hw->channels_min || !hw->channels_max ||
 783              hw->channels_min  >  hw->channels_max)
 784                 goto config_err;
 785
 786         dev_dbg(dev, "ASoC: %s <-> %s info:\n",         name_codec,
 787                                                         name_cpu);
 788         dev_dbg(dev, "ASoC: rate mask 0x%x\n",          hw->rates);
 789         dev_dbg(dev, "ASoC: ch   min %d max %d\n",      hw->channels_min,
 790                                                         hw->channels_max);
 791         dev_dbg(dev, "ASoC: rate min %d max %d\n",      hw->rate_min,
 792                                                         hw->rate_max);
 793
 794         return 0;
 795
 796 config_err:
 797         dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
 798                 name_codec, name_cpu, err_msg);
 799         return -EINVAL;
 800 }
 801
 802 /*
 803  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 804  * then initialized and any private data can be allocated. This also calls
 805  * startup for the cpu DAI, component, machine and codec DAI.
 806  */
 807 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
 808                           struct snd_pcm_substream *substream)
 809 {
 810         struct snd_soc_component *component;
 811         struct snd_soc_dai *dai;
 812         int i, ret = 0;
 813
 814         snd_soc_dpcm_mutex_assert_held(rtd);
 815
 816         for_each_rtd_components(rtd, i, component)
 817                 pinctrl_pm_select_default_state(component->dev);
 818
 819         ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
 820         if (ret < 0)
 821                 goto err;
 822
 823         ret = soc_pcm_components_open(substream);
 824         if (ret < 0)
 825                 goto err;
 826
 827         ret = snd_soc_link_startup(substream);
 828         if (ret < 0)
 829                 goto err;
 830
 831         /* startup the audio subsystem */
 832         for_each_rtd_dais(rtd, i, dai) {
 833                 ret = snd_soc_dai_startup(dai, substream);
 834                 if (ret < 0)
 835                         goto err;
 836         }
 837
 838         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 839         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 840                 goto dynamic;
 841
 842         /* Check that the codec and cpu DAIs are compatible */
 843         soc_pcm_init_runtime_hw(substream);
 844
 845         soc_pcm_update_symmetry(substream);
 846
 847         ret = soc_hw_sanity_check(substream);
 848         if (ret < 0)
 849                 goto err;
 850
 851         soc_pcm_apply_msb(substream);
 852
 853         /* Symmetry only applies if we've already got an active stream. */
 854         for_each_rtd_dais(rtd, i, dai) {
 855                 ret = soc_pcm_apply_symmetry(substream, dai);
 856                 if (ret != 0)
 857                         goto err;
 858         }
 859 dynamic:
 860         snd_soc_runtime_activate(rtd, substream->stream);
 861         ret = 0;
 862 err:
 863         if (ret < 0)
 864                 soc_pcm_clean(rtd, substream, 1);
 865
 866         return soc_pcm_ret(rtd, ret);
 867 }
 868
 869 /* PCM open ops for non-DPCM streams */
 870 static int soc_pcm_open(struct snd_pcm_substream *substream)
 871 {
 872         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 873         int ret;
 874
 875         snd_soc_dpcm_mutex_lock(rtd);
 876         ret = __soc_pcm_open(rtd, substream);
 877         snd_soc_dpcm_mutex_unlock(rtd);
 878         return ret;
 879 }
 880
 881 /*
 882  * Called by ALSA when the PCM substream is prepared, can set format, sample
 883  * rate, etc.  This function is non atomic and can be called multiple times,
 884  * it can refer to the runtime info.
 885  */
 886 static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
 887                              struct snd_pcm_substream *substream)
 888 {
 889         struct snd_soc_dai *dai;
 890         int i, ret = 0;
 891
 892         snd_soc_dpcm_mutex_assert_held(rtd);
 893
 894         ret = snd_soc_link_prepare(substream);
 895         if (ret < 0)
 896                 goto out;
 897
 898         ret = snd_soc_pcm_component_prepare(substream);
 899         if (ret < 0)
 900                 goto out;
 901
 902         ret = snd_soc_pcm_dai_prepare(substream);
 903         if (ret < 0)
 904                 goto out;
 905
 906         /* cancel any delayed stream shutdown that is pending */
 907         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 908             rtd->pop_wait) {
 909                 rtd->pop_wait = 0;
 910                 cancel_delayed_work(&rtd->delayed_work);
 911         }
 912
 913         snd_soc_dapm_stream_event(rtd, substream->stream,
 914                         SND_SOC_DAPM_STREAM_START);
 915
 916         for_each_rtd_dais(rtd, i, dai) {
 917                 if (dai->driver->ops && !dai->driver->ops->mute_unmute_on_trigger)
 918                         snd_soc_dai_digital_mute(dai, 0, substream->stream);
 919         }
 920
 921 out:
 922         return soc_pcm_ret(rtd, ret);
 923 }
 924
 925 /* PCM prepare ops for non-DPCM streams */
 926 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 927 {
 928         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 929         int ret;
 930
 931         snd_soc_dpcm_mutex_lock(rtd);
 932         ret = __soc_pcm_prepare(rtd, substream);
 933         snd_soc_dpcm_mutex_unlock(rtd);
 934         return ret;
 935 }
 936
 937 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 938                                        unsigned int mask)
 939 {
 940         struct snd_interval *interval;
 941         int channels = hweight_long(mask);
 942
 943         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 944         interval->min = channels;
 945         interval->max = channels;
 946 }
 947
 948 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
 949                             struct snd_pcm_substream *substream, int rollback)
 950 {
 951         struct snd_soc_dai *dai;
 952         int i;
 953
 954         snd_soc_dpcm_mutex_assert_held(rtd);
 955
 956         /* clear the corresponding DAIs parameters when going to be inactive */
 957         for_each_rtd_dais(rtd, i, dai) {
 958                 if (snd_soc_dai_active(dai) == 1)
 959                         soc_pcm_set_dai_params(dai, NULL);
 960
 961                 if (snd_soc_dai_stream_active(dai, substream->stream) == 1) {
 962                         if (dai->driver->ops && !dai->driver->ops->mute_unmute_on_trigger)
 963                                 snd_soc_dai_digital_mute(dai, 1, substream->stream);
 964                 }
 965         }
 966
 967         /* run the stream event */
 968         snd_soc_dapm_stream_stop(rtd, substream->stream);
 969
 970         /* free any machine hw params */
 971         snd_soc_link_hw_free(substream, rollback);
 972
 973         /* free any component resources */
 974         snd_soc_pcm_component_hw_free(substream, rollback);
 975
 976         /* now free hw params for the DAIs  */
 977         for_each_rtd_dais(rtd, i, dai)
 978                 if (snd_soc_dai_stream_valid(dai, substream->stream))
 979                         snd_soc_dai_hw_free(dai, substream, rollback);
 980
 981         return 0;
 982 }
 983
 984 /*
 985  * Frees resources allocated by hw_params, can be called multiple times
 986  */
 987 static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
 988                              struct snd_pcm_substream *substream)
 989 {
 990         return soc_pcm_hw_clean(rtd, substream, 0);
 991 }
 992
 993 /* hw_free PCM ops for non-DPCM streams */
 994 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 995 {
 996         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 997         int ret;
 998
 999         snd_soc_dpcm_mutex_lock(rtd);
1000         ret = __soc_pcm_hw_free(rtd, substream);
1001         snd_soc_dpcm_mutex_unlock(rtd);
1002         return ret;
1003 }
1004
1005 /*
1006  * Called by ALSA when the hardware params are set by application. This
1007  * function can also be called multiple times and can allocate buffers
1008  * (using snd_pcm_lib_* ). It's non-atomic.
1009  */
1010 static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
1011                                struct snd_pcm_substream *substream,
1012                                struct snd_pcm_hw_params *params)
1013 {
1014         struct snd_soc_dai *cpu_dai;
1015         struct snd_soc_dai *codec_dai;
1016         struct snd_pcm_hw_params tmp_params;
1017         int i, ret = 0;
1018
1019         snd_soc_dpcm_mutex_assert_held(rtd);
1020
1021         ret = soc_pcm_params_symmetry(substream, params);
1022         if (ret)
1023                 goto out;
1024
1025         ret = snd_soc_link_hw_params(substream, params);
1026         if (ret < 0)
1027                 goto out;
1028
1029         for_each_rtd_codec_dais(rtd, i, codec_dai) {
1030                 unsigned int tdm_mask = snd_soc_dai_tdm_mask_get(codec_dai, substream->stream);
1031
1032                 /*
1033                  * Skip CODECs which don't support the current stream type,
1034                  * the idea being that if a CODEC is not used for the currently
1035                  * set up transfer direction, it should not need to be
1036                  * configured, especially since the configuration used might
1037                  * not even be supported by that CODEC. There may be cases
1038                  * however where a CODEC needs to be set up although it is
1039                  * actually not being used for the transfer, e.g. if a
1040                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
1041                  * for the DAI link including a playback-only CODEC.
1042                  * If this becomes necessary, we will have to augment the
1043                  * machine driver setup with information on how to act, so
1044                  * we can do the right thing here.
1045                  */
1046                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1047                         continue;
1048
1049                 /* copy params for each codec */
1050                 tmp_params = *params;
1051
1052                 /* fixup params based on TDM slot masks */
1053                 if (tdm_mask)
1054                         soc_pcm_codec_params_fixup(&tmp_params, tdm_mask);
1055
1056                 ret = snd_soc_dai_hw_params(codec_dai, substream,
1057                                             &tmp_params);
1058                 if(ret < 0)
1059                         goto out;
1060
1061                 soc_pcm_set_dai_params(codec_dai, &tmp_params);
1062                 snd_soc_dapm_update_dai(substream, &tmp_params, codec_dai);
1063         }
1064
1065         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1066                 struct snd_soc_dai_link_ch_map *ch_maps;
1067                 unsigned int ch_mask = 0;
1068                 int j;
1069
1070                 /*
1071                  * Skip CPUs which don't support the current stream
1072                  * type. See soc_pcm_init_runtime_hw() for more details
1073                  */
1074                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1075                         continue;
1076
1077                 /* copy params for each cpu */
1078                 tmp_params = *params;
1079
1080                 /*
1081                  * construct cpu channel mask by combining ch_mask of each
1082                  * codec which maps to the cpu.
1083                  * see
1084                  *      soc.h :: [dai_link->ch_maps Image sample]
1085                  */
1086                 for_each_rtd_ch_maps(rtd, j, ch_maps)
1087                         if (ch_maps->cpu == i)
1088                                 ch_mask |= ch_maps->ch_mask;
1089
1090                 /* fixup cpu channel number */
1091                 if (ch_mask)
1092                         soc_pcm_codec_params_fixup(&tmp_params, ch_mask);
1093
1094                 ret = snd_soc_dai_hw_params(cpu_dai, substream, &tmp_params);
1095                 if (ret < 0)
1096                         goto out;
1097
1098                 /* store the parameters for each DAI */
1099                 soc_pcm_set_dai_params(cpu_dai, &tmp_params);
1100                 snd_soc_dapm_update_dai(substream, &tmp_params, cpu_dai);
1101         }
1102
1103         ret = snd_soc_pcm_component_hw_params(substream, params);
1104 out:
1105         if (ret < 0)
1106                 soc_pcm_hw_clean(rtd, substream, 1);
1107
1108         return soc_pcm_ret(rtd, ret);
1109 }
1110
1111 /* hw_params PCM ops for non-DPCM streams */
1112 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
1113                              struct snd_pcm_hw_params *params)
1114 {
1115         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1116         int ret;
1117
1118         snd_soc_dpcm_mutex_lock(rtd);
1119         ret = __soc_pcm_hw_params(rtd, substream, params);
1120         snd_soc_dpcm_mutex_unlock(rtd);
1121         return ret;
1122 }
1123
1124 #define TRIGGER_MAX 3
1125 static int (* const trigger[][TRIGGER_MAX])(struct snd_pcm_substream *substream, int cmd, int rollback) = {
1126         [SND_SOC_TRIGGER_ORDER_DEFAULT] = {
1127                 snd_soc_link_trigger,
1128                 snd_soc_pcm_component_trigger,
1129                 snd_soc_pcm_dai_trigger,
1130         },
1131         [SND_SOC_TRIGGER_ORDER_LDC] = {
1132                 snd_soc_link_trigger,
1133                 snd_soc_pcm_dai_trigger,
1134                 snd_soc_pcm_component_trigger,
1135         },
1136 };
1137
1138 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1139 {
1140         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1141         struct snd_soc_component *component;
1142         int ret = 0, r = 0, i;
1143         int rollback = 0;
1144         int start = 0, stop = 0;
1145
1146         /*
1147          * select START/STOP sequence
1148          */
1149         for_each_rtd_components(rtd, i, component) {
1150                 if (component->driver->trigger_start)
1151                         start = component->driver->trigger_start;
1152                 if (component->driver->trigger_stop)
1153                         stop = component->driver->trigger_stop;
1154         }
1155         if (rtd->dai_link->trigger_start)
1156                 start = rtd->dai_link->trigger_start;
1157         if (rtd->dai_link->trigger_stop)
1158                 stop  = rtd->dai_link->trigger_stop;
1159
1160         if (start < 0 || start >= SND_SOC_TRIGGER_ORDER_MAX ||
1161             stop  < 0 || stop  >= SND_SOC_TRIGGER_ORDER_MAX)
1162                 return -EINVAL;
1163
1164         /*
1165          * START
1166          */
1167         switch (cmd) {
1168         case SNDRV_PCM_TRIGGER_START:
1169         case SNDRV_PCM_TRIGGER_RESUME:
1170         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1171                 for (i = 0; i < TRIGGER_MAX; i++) {
1172                         r = trigger[start][i](substream, cmd, 0);
1173                         if (r < 0)
1174                                 break;
1175                 }
1176         }
1177
1178         /*
1179          * Rollback if START failed
1180          * find correspond STOP command
1181          */
1182         if (r < 0) {
1183                 rollback = 1;
1184                 ret = r;
1185                 switch (cmd) {
1186                 case SNDRV_PCM_TRIGGER_START:
1187                         cmd = SNDRV_PCM_TRIGGER_STOP;
1188                         break;
1189                 case SNDRV_PCM_TRIGGER_RESUME:
1190                         cmd = SNDRV_PCM_TRIGGER_SUSPEND;
1191                         break;
1192                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1193                         cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
1194                         break;
1195                 }
1196         }
1197
1198         /*
1199          * STOP
1200          */
1201         switch (cmd) {
1202         case SNDRV_PCM_TRIGGER_STOP:
1203         case SNDRV_PCM_TRIGGER_SUSPEND:
1204         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1205                 for (i = TRIGGER_MAX; i > 0; i--) {
1206                         r = trigger[stop][i - 1](substream, cmd, rollback);
1207                         if (r < 0)
1208                                 ret = r;
1209                 }
1210         }
1211
1212         return ret;
1213 }
1214
1215 /*
1216  * soc level wrapper for pointer callback
1217  * If cpu_dai, codec_dai, component driver has the delay callback, then
1218  * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
1219  */
1220 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1221 {
1222         struct snd_pcm_runtime *runtime = substream->runtime;
1223         snd_pcm_uframes_t offset = 0;
1224         snd_pcm_sframes_t codec_delay = 0;
1225         snd_pcm_sframes_t cpu_delay = 0;
1226
1227         offset = snd_soc_pcm_component_pointer(substream);
1228
1229         /* should be called *after* snd_soc_pcm_component_pointer() */
1230         snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
1231         snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
1232
1233         runtime->delay = cpu_delay + codec_delay;
1234
1235         return offset;
1236 }
1237
1238 /* connect a FE and BE */
1239 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1240                 struct snd_soc_pcm_runtime *be, int stream)
1241 {
1242         struct snd_pcm_substream *fe_substream;
1243         struct snd_pcm_substream *be_substream;
1244         struct snd_soc_dpcm *dpcm;
1245
1246         snd_soc_dpcm_mutex_assert_held(fe);
1247
1248         /* only add new dpcms */
1249         for_each_dpcm_be(fe, stream, dpcm) {
1250                 if (dpcm->be == be && dpcm->fe == fe)
1251                         return 0;
1252         }
1253
1254         fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1255         be_substream = snd_soc_dpcm_get_substream(be, stream);
1256
1257         if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
1258                 dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
1259                         __func__);
1260                 return -EINVAL;
1261         }
1262         if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
1263                 dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n");
1264                 be_substream->pcm->nonatomic = 1;
1265         }
1266
1267         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1268         if (!dpcm)
1269                 return -ENOMEM;
1270
1271         dpcm->be = be;
1272         dpcm->fe = fe;
1273         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1274         snd_soc_dpcm_stream_lock_irq(fe, stream);
1275         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1276         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1277         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1278
1279         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1280                         stream ? "capture" : "playback",  fe->dai_link->name,
1281                         stream ? "<-" : "->", be->dai_link->name);
1282
1283         dpcm_create_debugfs_state(dpcm, stream);
1284
1285         return 1;
1286 }
1287
1288 /* reparent a BE onto another FE */
1289 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1290                         struct snd_soc_pcm_runtime *be, int stream)
1291 {
1292         struct snd_soc_dpcm *dpcm;
1293         struct snd_pcm_substream *fe_substream, *be_substream;
1294
1295         /* reparent if BE is connected to other FEs */
1296         if (!be->dpcm[stream].users)
1297                 return;
1298
1299         be_substream = snd_soc_dpcm_get_substream(be, stream);
1300         if (!be_substream)
1301                 return;
1302
1303         for_each_dpcm_fe(be, stream, dpcm) {
1304                 if (dpcm->fe == fe)
1305                         continue;
1306
1307                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1308                         stream ? "capture" : "playback",
1309                         dpcm->fe->dai_link->name,
1310                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1311
1312                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1313                 be_substream->runtime = fe_substream->runtime;
1314                 break;
1315         }
1316 }
1317
1318 /* disconnect a BE and FE */
1319 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1320 {
1321         struct snd_soc_dpcm *dpcm, *d;
1322         LIST_HEAD(deleted_dpcms);
1323
1324         snd_soc_dpcm_mutex_assert_held(fe);
1325
1326         snd_soc_dpcm_stream_lock_irq(fe, stream);
1327         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1328                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1329                                 stream ? "capture" : "playback",
1330                                 dpcm->be->dai_link->name);
1331
1332                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1333                         continue;
1334
1335                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1336                         stream ? "capture" : "playback", fe->dai_link->name,
1337                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1338
1339                 /* BEs still alive need new FE */
1340                 dpcm_be_reparent(fe, dpcm->be, stream);
1341
1342                 list_del(&dpcm->list_be);
1343                 list_move(&dpcm->list_fe, &deleted_dpcms);
1344         }
1345         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1346
1347         while (!list_empty(&deleted_dpcms)) {
1348                 dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
1349                                         list_fe);
1350                 list_del(&dpcm->list_fe);
1351                 dpcm_remove_debugfs_state(dpcm);
1352                 kfree(dpcm);
1353         }
1354 }
1355
1356 /* get BE for DAI widget and stream */
1357 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1358                 struct snd_soc_dapm_widget *widget, int stream)
1359 {
1360         struct snd_soc_pcm_runtime *be;
1361         struct snd_soc_dapm_widget *w;
1362         struct snd_soc_dai *dai;
1363         int i;
1364
1365         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1366
1367         for_each_card_rtds(card, be) {
1368
1369                 if (!be->dai_link->no_pcm)
1370                         continue;
1371
1372                 if (!snd_soc_dpcm_get_substream(be, stream))
1373                         continue;
1374
1375                 for_each_rtd_dais(be, i, dai) {
1376                         w = snd_soc_dai_get_widget(dai, stream);
1377
1378                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1379                                 w ? w->name : "(not set)");
1380
1381                         if (w == widget)
1382                                 return be;
1383                 }
1384         }
1385
1386         /* Widget provided is not a BE */
1387         return NULL;
1388 }
1389
1390 int widget_in_list(struct snd_soc_dapm_widget_list *list,
1391                 struct snd_soc_dapm_widget *widget)
1392 {
1393         struct snd_soc_dapm_widget *w;
1394         int i;
1395
1396         for_each_dapm_widgets(list, i, w)
1397                 if (widget == w)
1398                         return 1;
1399
1400         return 0;
1401 }
1402 EXPORT_SYMBOL_GPL(widget_in_list);
1403
1404 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
1405 {
1406         struct snd_soc_card *card = widget->dapm->card;
1407         struct snd_soc_pcm_runtime *rtd;
1408         int stream;
1409
1410         /* adjust dir to stream */
1411         if (dir == SND_SOC_DAPM_DIR_OUT)
1412                 stream = SNDRV_PCM_STREAM_PLAYBACK;
1413         else
1414                 stream = SNDRV_PCM_STREAM_CAPTURE;
1415
1416         rtd = dpcm_get_be(card, widget, stream);
1417         if (rtd)
1418                 return true;
1419
1420         return false;
1421 }
1422 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
1423
1424 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1425         int stream, struct snd_soc_dapm_widget_list **list)
1426 {
1427         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(fe, 0);
1428         int paths;
1429
1430         if (fe->dai_link->num_cpus > 1) {
1431                 dev_err(fe->dev,
1432                         "%s doesn't support Multi CPU yet\n", __func__);
1433                 return -EINVAL;
1434         }
1435
1436         /* get number of valid DAI paths and their widgets */
1437         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1438                         fe->card->component_chaining ?
1439                                 NULL : dpcm_end_walk_at_be);
1440
1441         if (paths > 0)
1442                 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1443                         stream ? "capture" : "playback");
1444         else if (paths == 0)
1445                 dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
1446                          stream ? "capture" : "playback");
1447
1448         return paths;
1449 }
1450
1451 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1452 {
1453         snd_soc_dapm_dai_free_widgets(list);
1454 }
1455
1456 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1457                               struct snd_soc_dapm_widget_list *list)
1458 {
1459         struct snd_soc_dai *dai;
1460         unsigned int i;
1461
1462         /* is there a valid DAI widget for this BE */
1463         for_each_rtd_dais(dpcm->be, i, dai) {
1464                 struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
1465
1466                 /*
1467                  * The BE is pruned only if none of the dai
1468                  * widgets are in the active list.
1469                  */
1470                 if (widget && widget_in_list(list, widget))
1471                         return true;
1472         }
1473
1474         return false;
1475 }
1476
1477 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1478                             struct snd_soc_dapm_widget_list **list_)
1479 {
1480         struct snd_soc_dpcm *dpcm;
1481         int prune = 0;
1482
1483         /* Destroy any old FE <--> BE connections */
1484         for_each_dpcm_be(fe, stream, dpcm) {
1485                 if (dpcm_be_is_active(dpcm, stream, *list_))
1486                         continue;
1487
1488                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1489                         stream ? "capture" : "playback",
1490                         dpcm->be->dai_link->name, fe->dai_link->name);
1491                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1492                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
1493                 prune++;
1494         }
1495
1496         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1497         return prune;
1498 }
1499
1500 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1501         struct snd_soc_dapm_widget_list **list_)
1502 {
1503         struct snd_soc_card *card = fe->card;
1504         struct snd_soc_dapm_widget_list *list = *list_;
1505         struct snd_soc_pcm_runtime *be;
1506         struct snd_soc_dapm_widget *widget;
1507         struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1508         int i, new = 0, err;
1509
1510         /* don't connect if FE is not running */
1511         if (!fe_substream->runtime && !fe->fe_compr)
1512                 return new;
1513
1514         /* Create any new FE <--> BE connections */
1515         for_each_dapm_widgets(list, i, widget) {
1516
1517                 switch (widget->id) {
1518                 case snd_soc_dapm_dai_in:
1519                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1520                                 continue;
1521                         break;
1522                 case snd_soc_dapm_dai_out:
1523                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1524                                 continue;
1525                         break;
1526                 default:
1527                         continue;
1528                 }
1529
1530                 /* is there a valid BE rtd for this widget */
1531                 be = dpcm_get_be(card, widget, stream);
1532                 if (!be) {
1533                         dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
1534                                 widget->name);
1535                         continue;
1536                 }
1537
1538                 /*
1539                  * Filter for systems with 'component_chaining' enabled.
1540                  * This helps to avoid unnecessary re-configuration of an
1541                  * already active BE on such systems.
1542                  */
1543                 if (fe->card->component_chaining &&
1544                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1545                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1546                         continue;
1547
1548                 /* newly connected FE and BE */
1549                 err = dpcm_be_connect(fe, be, stream);
1550                 if (err < 0) {
1551                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1552                                 widget->name);
1553                         break;
1554                 } else if (err == 0) /* already connected */
1555                         continue;
1556
1557                 /* new */
1558                 dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
1559                 new++;
1560         }
1561
1562         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1563         return new;
1564 }
1565
1566 /*
1567  * Find the corresponding BE DAIs that source or sink audio to this
1568  * FE substream.
1569  */
1570 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1571         int stream, struct snd_soc_dapm_widget_list **list, int new)
1572 {
1573         if (new)
1574                 return dpcm_add_paths(fe, stream, list);
1575         else
1576                 return dpcm_prune_paths(fe, stream, list);
1577 }
1578
1579 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1580 {
1581         struct snd_soc_dpcm *dpcm;
1582
1583         for_each_dpcm_be(fe, stream, dpcm)
1584                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
1585 }
1586
1587 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
1588                       int do_hw_free, struct snd_soc_dpcm *last)
1589 {
1590         struct snd_soc_dpcm *dpcm;
1591
1592         /* disable any enabled and non active backends */
1593         for_each_dpcm_be(fe, stream, dpcm) {
1594                 struct snd_soc_pcm_runtime *be = dpcm->be;
1595                 struct snd_pcm_substream *be_substream =
1596                         snd_soc_dpcm_get_substream(be, stream);
1597
1598                 if (dpcm == last)
1599                         return;
1600
1601                 /* is this op for this BE ? */
1602                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1603                         continue;
1604
1605                 if (be->dpcm[stream].users == 0) {
1606                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1607                                 stream ? "capture" : "playback",
1608                                 be->dpcm[stream].state);
1609                         continue;
1610                 }
1611
1612                 if (--be->dpcm[stream].users != 0)
1613                         continue;
1614
1615                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
1616                         if (!do_hw_free)
1617                                 continue;
1618
1619                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
1620                                 __soc_pcm_hw_free(be, be_substream);
1621                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1622                         }
1623                 }
1624
1625                 __soc_pcm_close(be, be_substream);
1626                 be_substream->runtime = NULL;
1627                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1628         }
1629 }
1630
1631 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1632 {
1633         struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1634         struct snd_soc_pcm_runtime *be;
1635         struct snd_soc_dpcm *dpcm;
1636         int err, count = 0;
1637
1638         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1639         for_each_dpcm_be(fe, stream, dpcm) {
1640                 struct snd_pcm_substream *be_substream;
1641
1642                 be = dpcm->be;
1643                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1644
1645                 if (!be_substream) {
1646                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1647                                 stream ? "capture" : "playback");
1648                         continue;
1649                 }
1650
1651                 /* is this op for this BE ? */
1652                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1653                         continue;
1654
1655                 /* first time the dpcm is open ? */
1656                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
1657                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1658                                 stream ? "capture" : "playback",
1659                                 be->dpcm[stream].state);
1660                         continue;
1661                 }
1662
1663                 if (be->dpcm[stream].users++ != 0)
1664                         continue;
1665
1666                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1667                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1668                         continue;
1669
1670                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1671                         stream ? "capture" : "playback", be->dai_link->name);
1672
1673                 be_substream->runtime = fe_substream->runtime;
1674                 err = __soc_pcm_open(be, be_substream);
1675                 if (err < 0) {
1676                         be->dpcm[stream].users--;
1677                         if (be->dpcm[stream].users < 0)
1678                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1679                                         stream ? "capture" : "playback",
1680                                         be->dpcm[stream].state);
1681
1682                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1683                         goto unwind;
1684                 }
1685                 be->dpcm[stream].be_start = 0;
1686                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1687                 count++;
1688         }
1689
1690         return count;
1691
1692 unwind:
1693         dpcm_be_dai_startup_rollback(fe, stream, dpcm);
1694
1695         return soc_pcm_ret(fe, err);
1696 }
1697
1698 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
1699 {
1700         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1701         struct snd_pcm_runtime *runtime = substream->runtime;
1702         struct snd_pcm_hardware *hw = &runtime->hw;
1703         struct snd_soc_dai *dai;
1704         int stream = substream->stream;
1705         u64 formats = hw->formats;
1706         int i;
1707
1708         soc_pcm_hw_init(hw);
1709
1710         if (formats)
1711                 hw->formats &= formats;
1712
1713         for_each_rtd_cpu_dais(fe, i, dai) {
1714                 struct snd_soc_pcm_stream *cpu_stream;
1715
1716                 /*
1717                  * Skip CPUs which don't support the current stream
1718                  * type. See soc_pcm_init_runtime_hw() for more details
1719                  */
1720                 if (!snd_soc_dai_stream_valid(dai, stream))
1721                         continue;
1722
1723                 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1724
1725                 soc_pcm_hw_update_rate(hw, cpu_stream);
1726                 soc_pcm_hw_update_chan(hw, cpu_stream);
1727                 soc_pcm_hw_update_format(hw, cpu_stream);
1728                 soc_pcm_hw_update_subformat(hw, cpu_stream);
1729         }
1730
1731 }
1732
1733 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
1734 {
1735         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1736         struct snd_pcm_runtime *runtime = substream->runtime;
1737         struct snd_pcm_hardware *hw = &runtime->hw;
1738         struct snd_soc_dpcm *dpcm;
1739         struct snd_soc_dai *dai;
1740         int stream = substream->stream;
1741
1742         if (!fe->dai_link->dpcm_merged_format)
1743                 return;
1744
1745         /*
1746          * It returns merged BE codec format
1747          * if FE want to use it (= dpcm_merged_format)
1748          */
1749
1750         for_each_dpcm_be(fe, stream, dpcm) {
1751                 struct snd_soc_pcm_runtime *be = dpcm->be;
1752                 struct snd_soc_pcm_stream *codec_stream;
1753                 int i;
1754
1755                 for_each_rtd_codec_dais(be, i, dai) {
1756                         /*
1757                          * Skip CODECs which don't support the current stream
1758                          * type. See soc_pcm_init_runtime_hw() for more details
1759                          */
1760                         if (!snd_soc_dai_stream_valid(dai, stream))
1761                                 continue;
1762
1763                         codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1764
1765                         soc_pcm_hw_update_format(hw, codec_stream);
1766                         soc_pcm_hw_update_subformat(hw, codec_stream);
1767                 }
1768         }
1769 }
1770
1771 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
1772 {
1773         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1774         struct snd_pcm_runtime *runtime = substream->runtime;
1775         struct snd_pcm_hardware *hw = &runtime->hw;
1776         struct snd_soc_dpcm *dpcm;
1777         int stream = substream->stream;
1778
1779         if (!fe->dai_link->dpcm_merged_chan)
1780                 return;
1781
1782         /*
1783          * It returns merged BE codec channel;
1784          * if FE want to use it (= dpcm_merged_chan)
1785          */
1786
1787         for_each_dpcm_be(fe, stream, dpcm) {
1788                 struct snd_soc_pcm_runtime *be = dpcm->be;
1789                 struct snd_soc_pcm_stream *cpu_stream;
1790                 struct snd_soc_dai *dai;
1791                 int i;
1792
1793                 for_each_rtd_cpu_dais(be, i, dai) {
1794                         /*
1795                          * Skip CPUs which don't support the current stream
1796                          * type. See soc_pcm_init_runtime_hw() for more details
1797                          */
1798                         if (!snd_soc_dai_stream_valid(dai, stream))
1799                                 continue;
1800
1801                         cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1802
1803                         soc_pcm_hw_update_chan(hw, cpu_stream);
1804                 }
1805
1806                 /*
1807                  * chan min/max cannot be enforced if there are multiple CODEC
1808                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1809                  */
1810                 if (be->dai_link->num_codecs == 1) {
1811                         struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
1812                                 snd_soc_rtd_to_codec(be, 0), stream);
1813
1814                         soc_pcm_hw_update_chan(hw, codec_stream);
1815                 }
1816         }
1817 }
1818
1819 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
1820 {
1821         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1822         struct snd_pcm_runtime *runtime = substream->runtime;
1823         struct snd_pcm_hardware *hw = &runtime->hw;
1824         struct snd_soc_dpcm *dpcm;
1825         int stream = substream->stream;
1826
1827         if (!fe->dai_link->dpcm_merged_rate)
1828                 return;
1829
1830         /*
1831          * It returns merged BE codec channel;
1832          * if FE want to use it (= dpcm_merged_chan)
1833          */
1834
1835         for_each_dpcm_be(fe, stream, dpcm) {
1836                 struct snd_soc_pcm_runtime *be = dpcm->be;
1837                 struct snd_soc_pcm_stream *pcm;
1838                 struct snd_soc_dai *dai;
1839                 int i;
1840
1841                 for_each_rtd_dais(be, i, dai) {
1842                         /*
1843                          * Skip DAIs which don't support the current stream
1844                          * type. See soc_pcm_init_runtime_hw() for more details
1845                          */
1846                         if (!snd_soc_dai_stream_valid(dai, stream))
1847                                 continue;
1848
1849                         pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1850
1851                         soc_pcm_hw_update_rate(hw, pcm);
1852                 }
1853         }
1854 }
1855
1856 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1857                                int stream)
1858 {
1859         struct snd_soc_dpcm *dpcm;
1860         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
1861         struct snd_soc_dai *fe_cpu_dai;
1862         int err = 0;
1863         int i;
1864
1865         /* apply symmetry for FE */
1866         soc_pcm_update_symmetry(fe_substream);
1867
1868         for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1869                 /* Symmetry only applies if we've got an active stream. */
1870                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1871                 if (err < 0)
1872                         goto error;
1873         }
1874
1875         /* apply symmetry for BE */
1876         for_each_dpcm_be(fe, stream, dpcm) {
1877                 struct snd_soc_pcm_runtime *be = dpcm->be;
1878                 struct snd_pcm_substream *be_substream =
1879                         snd_soc_dpcm_get_substream(be, stream);
1880                 struct snd_soc_pcm_runtime *rtd;
1881                 struct snd_soc_dai *dai;
1882
1883                 /* A backend may not have the requested substream */
1884                 if (!be_substream)
1885                         continue;
1886
1887                 rtd = snd_soc_substream_to_rtd(be_substream);
1888                 if (rtd->dai_link->be_hw_params_fixup)
1889                         continue;
1890
1891                 soc_pcm_update_symmetry(be_substream);
1892
1893                 /* Symmetry only applies if we've got an active stream. */
1894                 for_each_rtd_dais(rtd, i, dai) {
1895                         err = soc_pcm_apply_symmetry(fe_substream, dai);
1896                         if (err < 0)
1897                                 goto error;
1898                 }
1899         }
1900 error:
1901         return soc_pcm_ret(fe, err);
1902 }
1903
1904 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1905 {
1906         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
1907         int stream = fe_substream->stream, ret = 0;
1908
1909         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1910
1911         ret = dpcm_be_dai_startup(fe, stream);
1912         if (ret < 0)
1913                 goto be_err;
1914
1915         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1916
1917         /* start the DAI frontend */
1918         ret = __soc_pcm_open(fe, fe_substream);
1919         if (ret < 0)
1920                 goto unwind;
1921
1922         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1923
1924         dpcm_runtime_setup_fe(fe_substream);
1925
1926         dpcm_runtime_setup_be_format(fe_substream);
1927         dpcm_runtime_setup_be_chan(fe_substream);
1928         dpcm_runtime_setup_be_rate(fe_substream);
1929
1930         ret = dpcm_apply_symmetry(fe_substream, stream);
1931
1932 unwind:
1933         if (ret < 0)
1934                 dpcm_be_dai_startup_unwind(fe, stream);
1935 be_err:
1936         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1937
1938         return soc_pcm_ret(fe, ret);
1939 }
1940
1941 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1942 {
1943         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1944         int stream = substream->stream;
1945
1946         snd_soc_dpcm_mutex_assert_held(fe);
1947
1948         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1949
1950         /* shutdown the BEs */
1951         dpcm_be_dai_shutdown(fe, stream);
1952
1953         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1954
1955         /* now shutdown the frontend */
1956         __soc_pcm_close(fe, substream);
1957
1958         /* run the stream stop event */
1959         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1960
1961         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1962         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1963         return 0;
1964 }
1965
1966 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1967 {
1968         struct snd_soc_dpcm *dpcm;
1969
1970         /* only hw_params backends that are either sinks or sources
1971          * to this frontend DAI */
1972         for_each_dpcm_be(fe, stream, dpcm) {
1973
1974                 struct snd_soc_pcm_runtime *be = dpcm->be;
1975                 struct snd_pcm_substream *be_substream =
1976                         snd_soc_dpcm_get_substream(be, stream);
1977
1978                 /* is this op for this BE ? */
1979                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1980                         continue;
1981
1982                 /* only free hw when no longer used - check all FEs */
1983                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1984                                 continue;
1985
1986                 /* do not free hw if this BE is used by other FE */
1987                 if (be->dpcm[stream].users > 1)
1988                         continue;
1989
1990                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1991                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1992                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1993                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1994                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1995                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1996                         continue;
1997
1998                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1999                         be->dai_link->name);
2000
2001                 __soc_pcm_hw_free(be, be_substream);
2002
2003                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2004         }
2005 }
2006
2007 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
2008 {
2009         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2010         int stream = substream->stream;
2011
2012         snd_soc_dpcm_mutex_lock(fe);
2013         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2014
2015         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
2016
2017         /* call hw_free on the frontend */
2018         soc_pcm_hw_clean(fe, substream, 0);
2019
2020         /* only hw_params backends that are either sinks or sources
2021          * to this frontend DAI */
2022         dpcm_be_dai_hw_free(fe, stream);
2023
2024         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2025         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2026
2027         snd_soc_dpcm_mutex_unlock(fe);
2028         return 0;
2029 }
2030
2031 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
2032 {
2033         struct snd_soc_pcm_runtime *be;
2034         struct snd_pcm_substream *be_substream;
2035         struct snd_soc_dpcm *dpcm;
2036         int ret;
2037
2038         for_each_dpcm_be(fe, stream, dpcm) {
2039                 struct snd_pcm_hw_params hw_params;
2040
2041                 be = dpcm->be;
2042                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2043
2044                 /* is this op for this BE ? */
2045                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2046                         continue;
2047
2048                 /* copy params for each dpcm */
2049                 memcpy(&hw_params, &fe->dpcm[stream].hw_params,
2050                                 sizeof(struct snd_pcm_hw_params));
2051
2052                 /* perform any hw_params fixups */
2053                 ret = snd_soc_link_be_hw_params_fixup(be, &hw_params);
2054                 if (ret < 0)
2055                         goto unwind;
2056
2057                 /* copy the fixed-up hw params for BE dai */
2058                 memcpy(&be->dpcm[stream].hw_params, &hw_params,
2059                        sizeof(struct snd_pcm_hw_params));
2060
2061                 /* only allow hw_params() if no connected FEs are running */
2062                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2063                         continue;
2064
2065                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2066                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2067                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2068                         continue;
2069
2070                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2071                         be->dai_link->name);
2072
2073                 ret = __soc_pcm_hw_params(be, be_substream, &hw_params);
2074                 if (ret < 0)
2075                         goto unwind;
2076
2077                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2078         }
2079         return 0;
2080
2081 unwind:
2082         dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2083                 __func__, be->dai_link->name, ret);
2084
2085         /* disable any enabled and non active backends */
2086         for_each_dpcm_be_rollback(fe, stream, dpcm) {
2087                 be = dpcm->be;
2088                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2089
2090                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2091                         continue;
2092
2093                 /* only allow hw_free() if no connected FEs are running */
2094                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2095                         continue;
2096
2097                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2098                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2099                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2100                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2101                         continue;
2102
2103                 __soc_pcm_hw_free(be, be_substream);
2104         }
2105
2106         return ret;
2107 }
2108
2109 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2110                                  struct snd_pcm_hw_params *params)
2111 {
2112         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2113         int ret, stream = substream->stream;
2114
2115         snd_soc_dpcm_mutex_lock(fe);
2116         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2117
2118         memcpy(&fe->dpcm[stream].hw_params, params,
2119                         sizeof(struct snd_pcm_hw_params));
2120         ret = dpcm_be_dai_hw_params(fe, stream);
2121         if (ret < 0)
2122                 goto out;
2123
2124         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2125                         fe->dai_link->name, params_rate(params),
2126                         params_channels(params), params_format(params));
2127
2128         /* call hw_params on the frontend */
2129         ret = __soc_pcm_hw_params(fe, substream, params);
2130         if (ret < 0)
2131                 dpcm_be_dai_hw_free(fe, stream);
2132         else
2133                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2134
2135 out:
2136         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2137         snd_soc_dpcm_mutex_unlock(fe);
2138
2139         return soc_pcm_ret(fe, ret);
2140 }
2141
2142 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2143                                int cmd)
2144 {
2145         struct snd_soc_pcm_runtime *be;
2146         bool pause_stop_transition;
2147         struct snd_soc_dpcm *dpcm;
2148         unsigned long flags;
2149         int ret = 0;
2150
2151         for_each_dpcm_be(fe, stream, dpcm) {
2152                 struct snd_pcm_substream *be_substream;
2153
2154                 be = dpcm->be;
2155                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2156
2157                 snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
2158
2159                 /* is this op for this BE ? */
2160                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2161                         goto next;
2162
2163                 dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
2164                         be->dai_link->name, cmd);
2165
2166                 switch (cmd) {
2167                 case SNDRV_PCM_TRIGGER_START:
2168                         if (!be->dpcm[stream].be_start &&
2169                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2170                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2171                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2172                                 goto next;
2173
2174                         be->dpcm[stream].be_start++;
2175                         if (be->dpcm[stream].be_start != 1)
2176                                 goto next;
2177
2178                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
2179                                 ret = soc_pcm_trigger(be_substream,
2180                                                       SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
2181                         else
2182                                 ret = soc_pcm_trigger(be_substream,
2183                                                       SNDRV_PCM_TRIGGER_START);
2184                         if (ret) {
2185                                 be->dpcm[stream].be_start--;
2186                                 goto next;
2187                         }
2188
2189                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2190                         break;
2191                 case SNDRV_PCM_TRIGGER_RESUME:
2192                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2193                                 goto next;
2194
2195                         be->dpcm[stream].be_start++;
2196                         if (be->dpcm[stream].be_start != 1)
2197                                 goto next;
2198
2199                         ret = soc_pcm_trigger(be_substream, cmd);
2200                         if (ret) {
2201                                 be->dpcm[stream].be_start--;
2202                                 goto next;
2203                         }
2204
2205                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2206                         break;
2207                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2208                         if (!be->dpcm[stream].be_start &&
2209                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2210                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2211                                 goto next;
2212
2213                         fe->dpcm[stream].fe_pause = false;
2214                         be->dpcm[stream].be_pause--;
2215
2216                         be->dpcm[stream].be_start++;
2217                         if (be->dpcm[stream].be_start != 1)
2218                                 goto next;
2219
2220                         ret = soc_pcm_trigger(be_substream, cmd);
2221                         if (ret) {
2222                                 be->dpcm[stream].be_start--;
2223                                 goto next;
2224                         }
2225
2226                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2227                         break;
2228                 case SNDRV_PCM_TRIGGER_STOP:
2229                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2230                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2231                                 goto next;
2232
2233                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2234                                 be->dpcm[stream].be_start--;
2235
2236                         if (be->dpcm[stream].be_start != 0)
2237                                 goto next;
2238
2239                         pause_stop_transition = false;
2240                         if (fe->dpcm[stream].fe_pause) {
2241                                 pause_stop_transition = true;
2242                                 fe->dpcm[stream].fe_pause = false;
2243                                 be->dpcm[stream].be_pause--;
2244                         }
2245
2246                         if (be->dpcm[stream].be_pause != 0)
2247                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
2248                         else
2249                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
2250
2251                         if (ret) {
2252                                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2253                                         be->dpcm[stream].be_start++;
2254                                 if (pause_stop_transition) {
2255                                         fe->dpcm[stream].fe_pause = true;
2256                                         be->dpcm[stream].be_pause++;
2257                                 }
2258                                 goto next;
2259                         }
2260
2261                         if (be->dpcm[stream].be_pause != 0)
2262                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2263                         else
2264                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2265
2266                         break;
2267                 case SNDRV_PCM_TRIGGER_SUSPEND:
2268                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2269                                 goto next;
2270
2271                         be->dpcm[stream].be_start--;
2272                         if (be->dpcm[stream].be_start != 0)
2273                                 goto next;
2274
2275                         ret = soc_pcm_trigger(be_substream, cmd);
2276                         if (ret) {
2277                                 be->dpcm[stream].be_start++;
2278                                 goto next;
2279                         }
2280
2281                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2282                         break;
2283                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2284                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2285                                 goto next;
2286
2287                         fe->dpcm[stream].fe_pause = true;
2288                         be->dpcm[stream].be_pause++;
2289
2290                         be->dpcm[stream].be_start--;
2291                         if (be->dpcm[stream].be_start != 0)
2292                                 goto next;
2293
2294                         ret = soc_pcm_trigger(be_substream, cmd);
2295                         if (ret) {
2296                                 be->dpcm[stream].be_start++;
2297                                 goto next;
2298                         }
2299
2300                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2301                         break;
2302                 }
2303 next:
2304                 snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
2305                 if (ret)
2306                         break;
2307         }
2308         return soc_pcm_ret(fe, ret);
2309 }
2310 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2311
2312 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2313                                   int cmd, bool fe_first)
2314 {
2315         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2316         int ret;
2317
2318         /* call trigger on the frontend before the backend. */
2319         if (fe_first) {
2320                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2321                         fe->dai_link->name, cmd);
2322
2323                 ret = soc_pcm_trigger(substream, cmd);
2324                 if (ret < 0)
2325                         return ret;
2326
2327                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2328                 return ret;
2329         }
2330
2331         /* call trigger on the frontend after the backend. */
2332         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2333         if (ret < 0)
2334                 return ret;
2335
2336         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2337                 fe->dai_link->name, cmd);
2338
2339         ret = soc_pcm_trigger(substream, cmd);
2340
2341         return ret;
2342 }
2343
2344 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2345 {
2346         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2347         int stream = substream->stream;
2348         int ret = 0;
2349         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2350
2351         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2352
2353         switch (trigger) {
2354         case SND_SOC_DPCM_TRIGGER_PRE:
2355                 switch (cmd) {
2356                 case SNDRV_PCM_TRIGGER_START:
2357                 case SNDRV_PCM_TRIGGER_RESUME:
2358                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2359                 case SNDRV_PCM_TRIGGER_DRAIN:
2360                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2361                         break;
2362                 case SNDRV_PCM_TRIGGER_STOP:
2363                 case SNDRV_PCM_TRIGGER_SUSPEND:
2364                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2365                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2366                         break;
2367                 default:
2368                         ret = -EINVAL;
2369                         break;
2370                 }
2371                 break;
2372         case SND_SOC_DPCM_TRIGGER_POST:
2373                 switch (cmd) {
2374                 case SNDRV_PCM_TRIGGER_START:
2375                 case SNDRV_PCM_TRIGGER_RESUME:
2376                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2377                 case SNDRV_PCM_TRIGGER_DRAIN:
2378                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2379                         break;
2380                 case SNDRV_PCM_TRIGGER_STOP:
2381                 case SNDRV_PCM_TRIGGER_SUSPEND:
2382                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2383                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2384                         break;
2385                 default:
2386                         ret = -EINVAL;
2387                         break;
2388                 }
2389                 break;
2390         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2391                 /* bespoke trigger() - handles both FE and BEs */
2392
2393                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2394                                 fe->dai_link->name, cmd);
2395
2396                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2397                 break;
2398         default:
2399                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2400                                 fe->dai_link->name);
2401                 ret = -EINVAL;
2402                 goto out;
2403         }
2404
2405         if (ret < 0) {
2406                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2407                         cmd, ret);
2408                 goto out;
2409         }
2410
2411         switch (cmd) {
2412         case SNDRV_PCM_TRIGGER_START:
2413         case SNDRV_PCM_TRIGGER_RESUME:
2414         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2415                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2416                 break;
2417         case SNDRV_PCM_TRIGGER_STOP:
2418         case SNDRV_PCM_TRIGGER_SUSPEND:
2419                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2420                 break;
2421         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2422                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2423                 break;
2424         }
2425
2426 out:
2427         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2428         return ret;
2429 }
2430
2431 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2432 {
2433         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2434         int stream = substream->stream;
2435
2436         /* if FE's runtime_update is already set, we're in race;
2437          * process this trigger later at exit
2438          */
2439         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2440                 fe->dpcm[stream].trigger_pending = cmd + 1;
2441                 return 0; /* delayed, assuming it's successful */
2442         }
2443
2444         /* we're alone, let's trigger */
2445         return dpcm_fe_dai_do_trigger(substream, cmd);
2446 }
2447
2448 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2449 {
2450         struct snd_soc_dpcm *dpcm;
2451         int ret = 0;
2452
2453         for_each_dpcm_be(fe, stream, dpcm) {
2454
2455                 struct snd_soc_pcm_runtime *be = dpcm->be;
2456                 struct snd_pcm_substream *be_substream =
2457                         snd_soc_dpcm_get_substream(be, stream);
2458
2459                 /* is this op for this BE ? */
2460                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2461                         continue;
2462
2463                 if (!snd_soc_dpcm_can_be_prepared(fe, be, stream))
2464                         continue;
2465
2466                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2467                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2468                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2469                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2470                         continue;
2471
2472                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2473                         be->dai_link->name);
2474
2475                 ret = __soc_pcm_prepare(be, be_substream);
2476                 if (ret < 0)
2477                         break;
2478
2479                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2480         }
2481
2482         return soc_pcm_ret(fe, ret);
2483 }
2484
2485 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2486 {
2487         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2488         int stream = substream->stream, ret = 0;
2489
2490         snd_soc_dpcm_mutex_lock(fe);
2491
2492         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2493
2494         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2495
2496         /* there is no point preparing this FE if there are no BEs */
2497         if (list_empty(&fe->dpcm[stream].be_clients)) {
2498                 /* dev_err_once() for visibility, dev_dbg() for debugging UCM profiles */
2499                 dev_err_once(fe->dev, "ASoC: no backend DAIs enabled for %s, possibly missing ALSA mixer-based routing or UCM profile\n",
2500                              fe->dai_link->name);
2501                 dev_dbg(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2502                         fe->dai_link->name);
2503                 ret = -EINVAL;
2504                 goto out;
2505         }
2506
2507         ret = dpcm_be_dai_prepare(fe, stream);
2508         if (ret < 0)
2509                 goto out;
2510
2511         /* call prepare on the frontend */
2512         ret = __soc_pcm_prepare(fe, substream);
2513         if (ret < 0)
2514                 goto out;
2515
2516         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2517
2518 out:
2519         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2520         snd_soc_dpcm_mutex_unlock(fe);
2521
2522         return soc_pcm_ret(fe, ret);
2523 }
2524
2525 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2526 {
2527         struct snd_pcm_substream *substream =
2528                 snd_soc_dpcm_get_substream(fe, stream);
2529         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2530         int err;
2531
2532         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2533                         stream ? "capture" : "playback", fe->dai_link->name);
2534
2535         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2536                 /* call bespoke trigger - FE takes care of all BE triggers */
2537                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2538                                 fe->dai_link->name);
2539
2540                 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2541         } else {
2542                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2543                         fe->dai_link->name);
2544
2545                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2546         }
2547
2548         dpcm_be_dai_hw_free(fe, stream);
2549
2550         dpcm_be_dai_shutdown(fe, stream);
2551
2552         /* run the stream event for each BE */
2553         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2554
2555         return soc_pcm_ret(fe, err);
2556 }
2557
2558 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2559 {
2560         struct snd_pcm_substream *substream =
2561                 snd_soc_dpcm_get_substream(fe, stream);
2562         struct snd_soc_dpcm *dpcm;
2563         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2564         int ret = 0;
2565
2566         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2567                         stream ? "capture" : "playback", fe->dai_link->name);
2568
2569         /* Only start the BE if the FE is ready */
2570         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2571                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
2572                 dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
2573                         fe->dai_link->name, fe->dpcm[stream].state);
2574                 ret = -EINVAL;
2575                 goto disconnect;
2576         }
2577
2578         /* startup must always be called for new BEs */
2579         ret = dpcm_be_dai_startup(fe, stream);
2580         if (ret < 0)
2581                 goto disconnect;
2582
2583         /* keep going if FE state is > open */
2584         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2585                 return 0;
2586
2587         ret = dpcm_be_dai_hw_params(fe, stream);
2588         if (ret < 0)
2589                 goto close;
2590
2591         /* keep going if FE state is > hw_params */
2592         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2593                 return 0;
2594
2595         ret = dpcm_be_dai_prepare(fe, stream);
2596         if (ret < 0)
2597                 goto hw_free;
2598
2599         /* run the stream event for each BE */
2600         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2601
2602         /* keep going if FE state is > prepare */
2603         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2604                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2605                 return 0;
2606
2607         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2608                 /* call trigger on the frontend - FE takes care of all BE triggers */
2609                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2610                                 fe->dai_link->name);
2611
2612                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2613                 if (ret < 0)
2614                         goto hw_free;
2615         } else {
2616                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2617                         fe->dai_link->name);
2618
2619                 ret = dpcm_be_dai_trigger(fe, stream,
2620                                         SNDRV_PCM_TRIGGER_START);
2621                 if (ret < 0)
2622                         goto hw_free;
2623         }
2624
2625         return 0;
2626
2627 hw_free:
2628         dpcm_be_dai_hw_free(fe, stream);
2629 close:
2630         dpcm_be_dai_shutdown(fe, stream);
2631 disconnect:
2632         /* disconnect any pending BEs */
2633         for_each_dpcm_be(fe, stream, dpcm) {
2634                 struct snd_soc_pcm_runtime *be = dpcm->be;
2635
2636                 /* is this op for this BE ? */
2637                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2638                         continue;
2639
2640                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
2641                         be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
2642                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2643         }
2644
2645         return soc_pcm_ret(fe, ret);
2646 }
2647
2648 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2649 {
2650         struct snd_soc_dapm_widget_list *list;
2651         int stream;
2652         int count, paths;
2653
2654         if (!fe->dai_link->dynamic)
2655                 return 0;
2656
2657         if (fe->dai_link->num_cpus > 1) {
2658                 dev_err(fe->dev,
2659                         "%s doesn't support Multi CPU yet\n", __func__);
2660                 return -EINVAL;
2661         }
2662
2663         /* only check active links */
2664         if (!snd_soc_dai_active(snd_soc_rtd_to_cpu(fe, 0)))
2665                 return 0;
2666
2667         /* DAPM sync will call this to update DSP paths */
2668         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2669                 new ? "new" : "old", fe->dai_link->name);
2670
2671         for_each_pcm_streams(stream) {
2672
2673                 /* skip if FE doesn't have playback/capture capability */
2674                 if (!snd_soc_dai_stream_valid(snd_soc_rtd_to_cpu(fe, 0),   stream) ||
2675                     !snd_soc_dai_stream_valid(snd_soc_rtd_to_codec(fe, 0), stream))
2676                         continue;
2677
2678                 /* skip if FE isn't currently playing/capturing */
2679                 if (!snd_soc_dai_stream_active(snd_soc_rtd_to_cpu(fe, 0), stream) ||
2680                     !snd_soc_dai_stream_active(snd_soc_rtd_to_codec(fe, 0), stream))
2681                         continue;
2682
2683                 paths = dpcm_path_get(fe, stream, &list);
2684                 if (paths < 0)
2685                         return paths;
2686
2687                 /* update any playback/capture paths */
2688                 count = dpcm_process_paths(fe, stream, &list, new);
2689                 if (count) {
2690                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2691                         if (new)
2692                                 dpcm_run_update_startup(fe, stream);
2693                         else
2694                                 dpcm_run_update_shutdown(fe, stream);
2695                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2696
2697                         dpcm_clear_pending_state(fe, stream);
2698                         dpcm_be_disconnect(fe, stream);
2699                 }
2700
2701                 dpcm_path_put(&list);
2702         }
2703
2704         return 0;
2705 }
2706
2707 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2708  * any DAI links.
2709  */
2710 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2711 {
2712         struct snd_soc_pcm_runtime *fe;
2713         int ret = 0;
2714
2715         snd_soc_dpcm_mutex_lock(card);
2716         /* shutdown all old paths first */
2717         for_each_card_rtds(card, fe) {
2718                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2719                 if (ret)
2720                         goto out;
2721         }
2722
2723         /* bring new paths up */
2724         for_each_card_rtds(card, fe) {
2725                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2726                 if (ret)
2727                         goto out;
2728         }
2729
2730 out:
2731         snd_soc_dpcm_mutex_unlock(card);
2732         return ret;
2733 }
2734 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2735
2736 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2737 {
2738         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
2739         struct snd_soc_dpcm *dpcm;
2740         int stream = fe_substream->stream;
2741
2742         snd_soc_dpcm_mutex_assert_held(fe);
2743
2744         /* mark FE's links ready to prune */
2745         for_each_dpcm_be(fe, stream, dpcm)
2746                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2747
2748         dpcm_be_disconnect(fe, stream);
2749 }
2750
2751 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2752 {
2753         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
2754         int ret;
2755
2756         snd_soc_dpcm_mutex_lock(fe);
2757         ret = dpcm_fe_dai_shutdown(fe_substream);
2758
2759         dpcm_fe_dai_cleanup(fe_substream);
2760
2761         snd_soc_dpcm_mutex_unlock(fe);
2762         return ret;
2763 }
2764
2765 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2766 {
2767         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
2768         struct snd_soc_dapm_widget_list *list;
2769         int ret;
2770         int stream = fe_substream->stream;
2771
2772         snd_soc_dpcm_mutex_lock(fe);
2773
2774         ret = dpcm_path_get(fe, stream, &list);
2775         if (ret < 0)
2776                 goto open_end;
2777
2778         /* calculate valid and active FE <-> BE dpcms */
2779         dpcm_process_paths(fe, stream, &list, 1);
2780
2781         ret = dpcm_fe_dai_startup(fe_substream);
2782         if (ret < 0)
2783                 dpcm_fe_dai_cleanup(fe_substream);
2784
2785         dpcm_clear_pending_state(fe, stream);
2786         dpcm_path_put(&list);
2787 open_end:
2788         snd_soc_dpcm_mutex_unlock(fe);
2789         return ret;
2790 }
2791
2792 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
2793                                     int *playback, int *capture)
2794 {
2795         struct snd_soc_dai_link *dai_link = rtd->dai_link;
2796         struct snd_soc_dai *cpu_dai;
2797         int has_playback = 0;
2798         int has_capture  = 0;
2799         int i;
2800
2801         if (dai_link->dynamic && dai_link->num_cpus > 1) {
2802                 dev_err(rtd->dev, "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2803                 return -EINVAL;
2804         }
2805
2806         if (dai_link->dynamic || dai_link->no_pcm) {
2807                 int stream;
2808
2809                 if (dai_link->dpcm_playback) {
2810                         stream = SNDRV_PCM_STREAM_PLAYBACK;
2811
2812                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2813                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2814                                         has_playback = 1;
2815                                         break;
2816                                 }
2817                         }
2818                         if (!has_playback) {
2819                                 dev_err(rtd->card->dev,
2820                                         "No CPU DAIs support playback for stream %s\n",
2821                                         dai_link->stream_name);
2822                                 return -EINVAL;
2823                         }
2824                 }
2825                 if (dai_link->dpcm_capture) {
2826                         stream = SNDRV_PCM_STREAM_CAPTURE;
2827
2828                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2829                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2830                                         has_capture = 1;
2831                                         break;
2832                                 }
2833                         }
2834
2835                         if (!has_capture) {
2836                                 dev_err(rtd->card->dev,
2837                                         "No CPU DAIs support capture for stream %s\n",
2838                                         dai_link->stream_name);
2839                                 return -EINVAL;
2840                         }
2841                 }
2842         } else {
2843                 struct snd_soc_dai_link_ch_map *ch_maps;
2844                 struct snd_soc_dai *codec_dai;
2845
2846                 /* Adapt stream for codec2codec links */
2847                 int cpu_capture  = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_CAPTURE);
2848                 int cpu_playback = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_PLAYBACK);
2849
2850                 /*
2851                  * see
2852                  *      soc.h :: [dai_link->ch_maps Image sample]
2853                  */
2854                 for_each_rtd_ch_maps(rtd, i, ch_maps) {
2855                         cpu_dai   = snd_soc_rtd_to_cpu(rtd,   ch_maps->cpu);
2856                         codec_dai = snd_soc_rtd_to_codec(rtd, ch_maps->codec);
2857
2858                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2859                             snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2860                                 has_playback = 1;
2861                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2862                             snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2863                                 has_capture = 1;
2864                 }
2865         }
2866
2867         if (dai_link->playback_only)
2868                 has_capture = 0;
2869
2870         if (dai_link->capture_only)
2871                 has_playback = 0;
2872
2873         if (!has_playback && !has_capture) {
2874                 dev_err(rtd->dev, "substream %s has no playback, no capture\n",
2875                         dai_link->stream_name);
2876
2877                 return -EINVAL;
2878         }
2879
2880         *playback = has_playback;
2881         *capture  = has_capture;
2882
2883         return 0;
2884 }
2885
2886 static int soc_create_pcm(struct snd_pcm **pcm,
2887                           struct snd_soc_pcm_runtime *rtd,
2888                           int playback, int capture, int num)
2889 {
2890         char new_name[64];
2891         int ret;
2892
2893         /* create the PCM */
2894         if (rtd->dai_link->c2c_params) {
2895                 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2896                          rtd->dai_link->stream_name);
2897
2898                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2899                                            playback, capture, pcm);
2900         } else if (rtd->dai_link->no_pcm) {
2901                 snprintf(new_name, sizeof(new_name), "(%s)",
2902                         rtd->dai_link->stream_name);
2903
2904                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2905                                 playback, capture, pcm);
2906         } else {
2907                 if (rtd->dai_link->dynamic)
2908                         snprintf(new_name, sizeof(new_name), "%s (*)",
2909                                 rtd->dai_link->stream_name);
2910                 else
2911                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2912                                 rtd->dai_link->stream_name,
2913                                 soc_codec_dai_name(rtd), num);
2914
2915                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2916                         capture, pcm);
2917         }
2918         if (ret < 0) {
2919                 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2920                         new_name, rtd->dai_link->name, ret);
2921                 return ret;
2922         }
2923         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2924
2925         return 0;
2926 }
2927
2928 /* create a new pcm */
2929 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2930 {
2931         struct snd_soc_component *component;
2932         struct snd_pcm *pcm;
2933         int ret = 0, playback = 0, capture = 0;
2934         int i;
2935
2936         ret = soc_get_playback_capture(rtd, &playback, &capture);
2937         if (ret < 0)
2938                 return ret;
2939
2940         ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
2941         if (ret < 0)
2942                 return ret;
2943
2944         /* DAPM dai link stream work */
2945         /*
2946          * Currently nothing to do for c2c links
2947          * Since c2c links are internal nodes in the DAPM graph and
2948          * don't interface with the outside world or application layer
2949          * we don't have to do any special handling on close.
2950          */
2951         if (!rtd->dai_link->c2c_params)
2952                 rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2953
2954         rtd->pcm = pcm;
2955         pcm->nonatomic = rtd->dai_link->nonatomic;
2956         pcm->private_data = rtd;
2957         pcm->no_device_suspend = true;
2958
2959         if (rtd->dai_link->no_pcm || rtd->dai_link->c2c_params) {
2960                 if (playback)
2961                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2962                 if (capture)
2963                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2964                 goto out;
2965         }
2966
2967         /* ASoC PCM operations */
2968         if (rtd->dai_link->dynamic) {
2969                 rtd->ops.open           = dpcm_fe_dai_open;
2970                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2971                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2972                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2973                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2974                 rtd->ops.close          = dpcm_fe_dai_close;
2975                 rtd->ops.pointer        = soc_pcm_pointer;
2976         } else {
2977                 rtd->ops.open           = soc_pcm_open;
2978                 rtd->ops.hw_params      = soc_pcm_hw_params;
2979                 rtd->ops.prepare        = soc_pcm_prepare;
2980                 rtd->ops.trigger        = soc_pcm_trigger;
2981                 rtd->ops.hw_free        = soc_pcm_hw_free;
2982                 rtd->ops.close          = soc_pcm_close;
2983                 rtd->ops.pointer        = soc_pcm_pointer;
2984         }
2985
2986         for_each_rtd_components(rtd, i, component) {
2987                 const struct snd_soc_component_driver *drv = component->driver;
2988
2989                 if (drv->ioctl)
2990                         rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2991                 if (drv->sync_stop)
2992                         rtd->ops.sync_stop      = snd_soc_pcm_component_sync_stop;
2993                 if (drv->copy)
2994                         rtd->ops.copy           = snd_soc_pcm_component_copy;
2995                 if (drv->page)
2996                         rtd->ops.page           = snd_soc_pcm_component_page;
2997                 if (drv->mmap)
2998                         rtd->ops.mmap           = snd_soc_pcm_component_mmap;
2999                 if (drv->ack)
3000                         rtd->ops.ack            = snd_soc_pcm_component_ack;
3001         }
3002
3003         if (playback)
3004                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
3005
3006         if (capture)
3007                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
3008
3009         ret = snd_soc_pcm_component_new(rtd);
3010         if (ret < 0)
3011                 return ret;
3012 out:
3013         dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
3014                 soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
3015         return ret;
3016 }
3017
3018 /* is the current PCM operation for this FE ? */
3019 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
3020 {
3021         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
3022                 return 1;
3023         return 0;
3024 }
3025 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
3026
3027 /* is the current PCM operation for this BE ? */
3028 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
3029                 struct snd_soc_pcm_runtime *be, int stream)
3030 {
3031         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
3032            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
3033                   be->dpcm[stream].runtime_update))
3034                 return 1;
3035         return 0;
3036 }
3037 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
3038
3039 /* get the substream for this BE */
3040 struct snd_pcm_substream *
3041         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
3042 {
3043         return be->pcm->streams[stream].substream;
3044 }
3045 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
3046
3047 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
3048                                     struct snd_soc_pcm_runtime *be,
3049                                     int stream,
3050                                     const enum snd_soc_dpcm_state *states,
3051                                     int num_states)
3052 {
3053         struct snd_soc_dpcm *dpcm;
3054         int state;
3055         int ret = 1;
3056         int i;
3057
3058         for_each_dpcm_fe(be, stream, dpcm) {
3059
3060                 if (dpcm->fe == fe)
3061                         continue;
3062
3063                 state = dpcm->fe->dpcm[stream].state;
3064                 for (i = 0; i < num_states; i++) {
3065                         if (state == states[i]) {
3066                                 ret = 0;
3067                                 break;
3068                         }
3069                 }
3070         }
3071
3072         /* it's safe to do this BE DAI */
3073         return ret;
3074 }
3075
3076 /*
3077  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3078  * are not running, paused or suspended for the specified stream direction.
3079  */
3080 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3081                 struct snd_soc_pcm_runtime *be, int stream)
3082 {
3083         const enum snd_soc_dpcm_state state[] = {
3084                 SND_SOC_DPCM_STATE_START,
3085                 SND_SOC_DPCM_STATE_PAUSED,
3086                 SND_SOC_DPCM_STATE_SUSPEND,
3087         };
3088
3089         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3090 }
3091 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3092
3093 /*
3094  * We can only change hw params a BE DAI if any of it's FE are not prepared,
3095  * running, paused or suspended for the specified stream direction.
3096  */
3097 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3098                 struct snd_soc_pcm_runtime *be, int stream)
3099 {
3100         const enum snd_soc_dpcm_state state[] = {
3101                 SND_SOC_DPCM_STATE_START,
3102                 SND_SOC_DPCM_STATE_PAUSED,
3103                 SND_SOC_DPCM_STATE_SUSPEND,
3104                 SND_SOC_DPCM_STATE_PREPARE,
3105         };
3106
3107         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3108 }
3109 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
3110
3111 /*
3112  * We can only prepare a BE DAI if any of it's FE are not prepared,
3113  * running or paused for the specified stream direction.
3114  */
3115 int snd_soc_dpcm_can_be_prepared(struct snd_soc_pcm_runtime *fe,
3116                                  struct snd_soc_pcm_runtime *be, int stream)
3117 {
3118         const enum snd_soc_dpcm_state state[] = {
3119                 SND_SOC_DPCM_STATE_START,
3120                 SND_SOC_DPCM_STATE_PAUSED,
3121                 SND_SOC_DPCM_STATE_PREPARE,
3122         };
3123
3124         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3125 }
3126 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_prepared);