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 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         int i;
 326
 327         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 328                 return true;
 329
 330         for_each_rtd_components(rtd, i, component)
 331                 if (component->driver->use_pmdown_time)
 332                         /* No need to go through all components */
 333                         return false;
 334
 335         return true;
 336 }
 337
 338 /**
 339  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 340  * @substream: the pcm substream
 341  * @hw: the hardware parameters
 342  *
 343  * Sets the substream runtime hardware parameters.
 344  */
 345 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 346         const struct snd_pcm_hardware *hw)
 347 {
 348         substream->runtime->hw = *hw;
 349
 350         return 0;
 351 }
 352 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 353
 354 /* DPCM stream event, send event to FE and all active BEs. */
 355 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 356         int event)
 357 {
 358         struct snd_soc_dpcm *dpcm;
 359
 360         snd_soc_dpcm_mutex_assert_held(fe);
 361
 362         for_each_dpcm_be(fe, dir, dpcm) {
 363
 364                 struct snd_soc_pcm_runtime *be = dpcm->be;
 365
 366                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 367                                 be->dai_link->name, event, dir);
 368
 369                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
 370                     (be->dpcm[dir].users >= 1))
 371                         continue;
 372
 373                 snd_soc_dapm_stream_event(be, dir, event);
 374         }
 375
 376         snd_soc_dapm_stream_event(fe, dir, event);
 377
 378         return 0;
 379 }
 380
 381 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
 382                                    struct snd_pcm_hw_params *params)
 383 {
 384         if (params) {
 385                 dai->rate        = params_rate(params);
 386                 dai->channels    = params_channels(params);
 387                 dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
 388         } else {
 389                 dai->rate        = 0;
 390                 dai->channels    = 0;
 391                 dai->sample_bits = 0;
 392         }
 393 }
 394
 395 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 396                                         struct snd_soc_dai *soc_dai)
 397 {
 398         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 399         int ret;
 400
 401         if (!snd_soc_dai_active(soc_dai))
 402                 return 0;
 403
 404 #define __soc_pcm_apply_symmetry(name, NAME)                            \
 405         if (soc_dai->name && (soc_dai->driver->symmetric_##name ||      \
 406                               rtd->dai_link->symmetric_##name)) {       \
 407                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
 408                         #name, soc_dai->name);                          \
 409                                                                         \
 410                 ret = snd_pcm_hw_constraint_single(substream->runtime,  \
 411                                                    SNDRV_PCM_HW_PARAM_##NAME,\
 412                                                    soc_dai->name);      \
 413                 if (ret < 0) {                                          \
 414                         dev_err(soc_dai->dev,                           \
 415                                 "ASoC: Unable to apply %s constraint: %d\n",\
 416                                 #name, ret);                            \
 417                         return ret;                                     \
 418                 }                                                       \
 419         }
 420
 421         __soc_pcm_apply_symmetry(rate,          RATE);
 422         __soc_pcm_apply_symmetry(channels,      CHANNELS);
 423         __soc_pcm_apply_symmetry(sample_bits,   SAMPLE_BITS);
 424
 425         return 0;
 426 }
 427
 428 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 429                                 struct snd_pcm_hw_params *params)
 430 {
 431         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 432         struct snd_soc_dai d;
 433         struct snd_soc_dai *dai;
 434         struct snd_soc_dai *cpu_dai;
 435         unsigned int symmetry, i;
 436
 437         d.name = __func__;
 438         soc_pcm_set_dai_params(&d, params);
 439
 440 #define __soc_pcm_params_symmetry(xxx)                                  \
 441         symmetry = rtd->dai_link->symmetric_##xxx;                      \
 442         for_each_rtd_dais(rtd, i, dai)                                  \
 443                 symmetry |= dai->driver->symmetric_##xxx;               \
 444                                                                         \
 445         if (symmetry)                                                   \
 446                 for_each_rtd_cpu_dais(rtd, i, cpu_dai)                  \
 447                         if (!snd_soc_dai_is_dummy(cpu_dai) &&           \
 448                             cpu_dai->xxx && cpu_dai->xxx != d.xxx) {    \
 449                                 dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
 450                                         #xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
 451                                 return -EINVAL;                         \
 452                         }
 453
 454         /* reject unmatched parameters when applying symmetry */
 455         __soc_pcm_params_symmetry(rate);
 456         __soc_pcm_params_symmetry(channels);
 457         __soc_pcm_params_symmetry(sample_bits);
 458
 459         return 0;
 460 }
 461
 462 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
 463 {
 464         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 465         struct snd_soc_dai_link *link = rtd->dai_link;
 466         struct snd_soc_dai *dai;
 467         unsigned int symmetry, i;
 468
 469         symmetry = link->symmetric_rate ||
 470                 link->symmetric_channels ||
 471                 link->symmetric_sample_bits;
 472
 473         for_each_rtd_dais(rtd, i, dai)
 474                 symmetry = symmetry ||
 475                         dai->driver->symmetric_rate ||
 476                         dai->driver->symmetric_channels ||
 477                         dai->driver->symmetric_sample_bits;
 478
 479         if (symmetry)
 480                 substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 481 }
 482
 483 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 484 {
 485         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 486         int ret;
 487
 488         if (!bits)
 489                 return;
 490
 491         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 492         if (ret != 0)
 493                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 494                                  bits, ret);
 495 }
 496
 497 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 498 {
 499         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 500         struct snd_soc_dai *cpu_dai;
 501         struct snd_soc_dai *codec_dai;
 502         int stream = substream->stream;
 503         int i;
 504         unsigned int bits = 0, cpu_bits = 0;
 505
 506         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 507                 struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 508
 509                 if (pcm_codec->sig_bits == 0) {
 510                         bits = 0;
 511                         break;
 512                 }
 513                 bits = max(pcm_codec->sig_bits, bits);
 514         }
 515
 516         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 517                 struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 518
 519                 if (pcm_cpu->sig_bits == 0) {
 520                         cpu_bits = 0;
 521                         break;
 522                 }
 523                 cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
 524         }
 525
 526         soc_pcm_set_msb(substream, bits);
 527         soc_pcm_set_msb(substream, cpu_bits);
 528 }
 529
 530 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
 531 {
 532         hw->rates               = UINT_MAX;
 533         hw->rate_min            = 0;
 534         hw->rate_max            = UINT_MAX;
 535         hw->channels_min        = 0;
 536         hw->channels_max        = UINT_MAX;
 537         hw->formats             = ULLONG_MAX;
 538 }
 539
 540 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
 541                                    struct snd_soc_pcm_stream *p)
 542 {
 543         hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
 544
 545         /* setup hw->rate_min/max via hw->rates first */
 546         snd_pcm_hw_limit_rates(hw);
 547
 548         /* update hw->rate_min/max by snd_soc_pcm_stream */
 549         hw->rate_min = max(hw->rate_min, p->rate_min);
 550         hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
 551 }
 552
 553 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
 554                                    struct snd_soc_pcm_stream *p)
 555 {
 556         hw->channels_min = max(hw->channels_min, p->channels_min);
 557         hw->channels_max = min(hw->channels_max, p->channels_max);
 558 }
 559
 560 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
 561                                      struct snd_soc_pcm_stream *p)
 562 {
 563         hw->formats &= p->formats;
 564 }
 565
 566 static void soc_pcm_hw_update_subformat(struct snd_pcm_hardware *hw,
 567                                         struct snd_soc_pcm_stream *p)
 568 {
 569         hw->subformats &= p->subformats;
 570 }
 571
 572 /**
 573  * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
 574  * @rtd: ASoC PCM runtime
 575  * @hw: PCM hardware parameters (output)
 576  * @stream: Direction of the PCM stream
 577  *
 578  * Calculates the subset of stream parameters supported by all DAIs
 579  * associated with the PCM stream.
 580  */
 581 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
 582                             struct snd_pcm_hardware *hw, int stream)
 583 {
 584         struct snd_soc_dai *codec_dai;
 585         struct snd_soc_dai *cpu_dai;
 586         struct snd_soc_pcm_stream *codec_stream;
 587         struct snd_soc_pcm_stream *cpu_stream;
 588         unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
 589         int i;
 590
 591         soc_pcm_hw_init(hw);
 592
 593         /* first calculate min/max only for CPUs in the DAI link */
 594         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 595
 596                 /*
 597                  * Skip CPUs which don't support the current stream type.
 598                  * Otherwise, since the rate, channel, and format values will
 599                  * zero in that case, we would have no usable settings left,
 600                  * causing the resulting setup to fail.
 601                  */
 602                 if (!snd_soc_dai_stream_valid(cpu_dai, stream))
 603                         continue;
 604
 605                 cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 606
 607                 soc_pcm_hw_update_chan(hw, cpu_stream);
 608                 soc_pcm_hw_update_rate(hw, cpu_stream);
 609                 soc_pcm_hw_update_format(hw, cpu_stream);
 610                 soc_pcm_hw_update_subformat(hw, cpu_stream);
 611         }
 612         cpu_chan_min = hw->channels_min;
 613         cpu_chan_max = hw->channels_max;
 614
 615         /* second calculate min/max only for CODECs in the DAI link */
 616         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 617
 618                 /*
 619                  * Skip CODECs which don't support the current stream type.
 620                  * Otherwise, since the rate, channel, and format values will
 621                  * zero in that case, we would have no usable settings left,
 622                  * causing the resulting setup to fail.
 623                  */
 624                 if (!snd_soc_dai_stream_valid(codec_dai, stream))
 625                         continue;
 626
 627                 codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 628
 629                 soc_pcm_hw_update_chan(hw, codec_stream);
 630                 soc_pcm_hw_update_rate(hw, codec_stream);
 631                 soc_pcm_hw_update_format(hw, codec_stream);
 632                 soc_pcm_hw_update_subformat(hw, codec_stream);
 633         }
 634
 635         /* Verify both a valid CPU DAI and a valid CODEC DAI were found */
 636         if (!hw->channels_min)
 637                 return -EINVAL;
 638
 639         /*
 640          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 641          * connected to CPU DAI(s), use CPU DAI's directly and let
 642          * channel allocation be fixed up later
 643          */
 644         if (rtd->dai_link->num_codecs > 1) {
 645                 hw->channels_min = cpu_chan_min;
 646                 hw->channels_max = cpu_chan_max;
 647         }
 648
 649         return 0;
 650 }
 651 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
 652
 653 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 654 {
 655         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 656         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 657         u64 formats = hw->formats;
 658
 659         /*
 660          * At least one CPU and one CODEC should match. Otherwise, we should
 661          * have bailed out on a higher level, since there would be no CPU or
 662          * CODEC to support the transfer direction in that case.
 663          */
 664         snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
 665
 666         if (formats)
 667                 hw->formats &= formats;
 668 }
 669
 670 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
 671 {
 672         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 673         struct snd_soc_component *component;
 674         int i, ret = 0;
 675
 676         for_each_rtd_components(rtd, i, component) {
 677                 ret = snd_soc_component_module_get_when_open(component, substream);
 678                 if (ret < 0)
 679                         break;
 680
 681                 ret = snd_soc_component_open(component, substream);
 682                 if (ret < 0)
 683                         break;
 684         }
 685
 686         return ret;
 687 }
 688
 689 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
 690                                     int rollback)
 691 {
 692         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 693         struct snd_soc_component *component;
 694         int i, ret = 0;
 695
 696         for_each_rtd_components(rtd, i, component) {
 697                 int r = snd_soc_component_close(component, substream, rollback);
 698                 if (r < 0)
 699                         ret = r; /* use last ret */
 700
 701                 snd_soc_component_module_put_when_close(component, substream, rollback);
 702         }
 703
 704         return ret;
 705 }
 706
 707 static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
 708                          struct snd_pcm_substream *substream, int rollback)
 709 {
 710         struct snd_soc_component *component;
 711         struct snd_soc_dai *dai;
 712         int i;
 713
 714         snd_soc_dpcm_mutex_assert_held(rtd);
 715
 716         if (!rollback) {
 717                 snd_soc_runtime_deactivate(rtd, substream->stream);
 718
 719                 /* Make sure DAI parameters cleared if the DAI becomes inactive */
 720                 for_each_rtd_dais(rtd, i, dai) {
 721                         if (snd_soc_dai_active(dai) == 0 &&
 722                             (dai->rate || dai->channels || dai->sample_bits))
 723                                 soc_pcm_set_dai_params(dai, NULL);
 724                 }
 725         }
 726
 727         for_each_rtd_dais_reverse(rtd, i, dai)
 728                 snd_soc_dai_shutdown(dai, substream, rollback);
 729
 730         snd_soc_link_shutdown(substream, rollback);
 731
 732         soc_pcm_components_close(substream, rollback);
 733
 734         snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
 735
 736         for_each_rtd_components(rtd, i, component)
 737                 if (!snd_soc_component_active(component))
 738                         pinctrl_pm_select_sleep_state(component->dev);
 739
 740         return 0;
 741 }
 742
 743 /*
 744  * Called by ALSA when a PCM substream is closed. Private data can be
 745  * freed here. The cpu DAI, codec DAI, machine and components are also
 746  * shutdown.
 747  */
 748 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
 749                            struct snd_pcm_substream *substream)
 750 {
 751         return soc_pcm_clean(rtd, substream, 0);
 752 }
 753
 754 /* PCM close ops for non-DPCM streams */
 755 static int soc_pcm_close(struct snd_pcm_substream *substream)
 756 {
 757         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 758
 759         snd_soc_dpcm_mutex_lock(rtd);
 760         __soc_pcm_close(rtd, substream);
 761         snd_soc_dpcm_mutex_unlock(rtd);
 762         return 0;
 763 }
 764
 765 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
 766 {
 767         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 768         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 769         const char *name_cpu = soc_cpu_dai_name(rtd);
 770         const char *name_codec = soc_codec_dai_name(rtd);
 771         const char *err_msg;
 772         struct device *dev = rtd->dev;
 773
 774         err_msg = "rates";
 775         if (!hw->rates)
 776                 goto config_err;
 777
 778         err_msg = "formats";
 779         if (!hw->formats)
 780                 goto config_err;
 781
 782         err_msg = "channels";
 783         if (!hw->channels_min || !hw->channels_max ||
 784              hw->channels_min  >  hw->channels_max)
 785                 goto config_err;
 786
 787         dev_dbg(dev, "ASoC: %s <-> %s info:\n",         name_codec,
 788                                                         name_cpu);
 789         dev_dbg(dev, "ASoC: rate mask 0x%x\n",          hw->rates);
 790         dev_dbg(dev, "ASoC: ch   min %d max %d\n",      hw->channels_min,
 791                                                         hw->channels_max);
 792         dev_dbg(dev, "ASoC: rate min %d max %d\n",      hw->rate_min,
 793                                                         hw->rate_max);
 794
 795         return 0;
 796
 797 config_err:
 798         dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
 799                 name_codec, name_cpu, err_msg);
 800         return -EINVAL;
 801 }
 802
 803 /*
 804  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 805  * then initialized and any private data can be allocated. This also calls
 806  * startup for the cpu DAI, component, machine and codec DAI.
 807  */
 808 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
 809                           struct snd_pcm_substream *substream)
 810 {
 811         struct snd_soc_component *component;
 812         struct snd_soc_dai *dai;
 813         int i, ret = 0;
 814
 815         snd_soc_dpcm_mutex_assert_held(rtd);
 816
 817         for_each_rtd_components(rtd, i, component)
 818                 pinctrl_pm_select_default_state(component->dev);
 819
 820         ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
 821         if (ret < 0)
 822                 goto err;
 823
 824         ret = soc_pcm_components_open(substream);
 825         if (ret < 0)
 826                 goto err;
 827
 828         ret = snd_soc_link_startup(substream);
 829         if (ret < 0)
 830                 goto err;
 831
 832         /* startup the audio subsystem */
 833         for_each_rtd_dais(rtd, i, dai) {
 834                 ret = snd_soc_dai_startup(dai, substream);
 835                 if (ret < 0)
 836                         goto err;
 837         }
 838
 839         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 840         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 841                 goto dynamic;
 842
 843         /* Check that the codec and cpu DAIs are compatible */
 844         soc_pcm_init_runtime_hw(substream);
 845
 846         soc_pcm_update_symmetry(substream);
 847
 848         ret = soc_hw_sanity_check(substream);
 849         if (ret < 0)
 850                 goto err;
 851
 852         soc_pcm_apply_msb(substream);
 853
 854         /* Symmetry only applies if we've already got an active stream. */
 855         for_each_rtd_dais(rtd, i, dai) {
 856                 ret = soc_pcm_apply_symmetry(substream, dai);
 857                 if (ret != 0)
 858                         goto err;
 859         }
 860 dynamic:
 861         snd_soc_runtime_activate(rtd, substream->stream);
 862         ret = 0;
 863 err:
 864         if (ret < 0)
 865                 soc_pcm_clean(rtd, substream, 1);
 866
 867         return soc_pcm_ret(rtd, ret);
 868 }
 869
 870 /* PCM open ops for non-DPCM streams */
 871 static int soc_pcm_open(struct snd_pcm_substream *substream)
 872 {
 873         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 874         int ret;
 875
 876         snd_soc_dpcm_mutex_lock(rtd);
 877         ret = __soc_pcm_open(rtd, substream);
 878         snd_soc_dpcm_mutex_unlock(rtd);
 879         return ret;
 880 }
 881
 882 /*
 883  * Called by ALSA when the PCM substream is prepared, can set format, sample
 884  * rate, etc.  This function is non atomic and can be called multiple times,
 885  * it can refer to the runtime info.
 886  */
 887 static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
 888                              struct snd_pcm_substream *substream)
 889 {
 890         struct snd_soc_dai *dai;
 891         int i, ret = 0;
 892
 893         snd_soc_dpcm_mutex_assert_held(rtd);
 894
 895         ret = snd_soc_link_prepare(substream);
 896         if (ret < 0)
 897                 goto out;
 898
 899         ret = snd_soc_pcm_component_prepare(substream);
 900         if (ret < 0)
 901                 goto out;
 902
 903         ret = snd_soc_pcm_dai_prepare(substream);
 904         if (ret < 0)
 905                 goto out;
 906
 907         /* cancel any delayed stream shutdown that is pending */
 908         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 909             rtd->pop_wait) {
 910                 rtd->pop_wait = 0;
 911                 cancel_delayed_work(&rtd->delayed_work);
 912         }
 913
 914         snd_soc_dapm_stream_event(rtd, substream->stream,
 915                         SND_SOC_DAPM_STREAM_START);
 916
 917         for_each_rtd_dais(rtd, i, dai) {
 918                 if (dai->driver->ops && !dai->driver->ops->mute_unmute_on_trigger)
 919                         snd_soc_dai_digital_mute(dai, 0, substream->stream);
 920         }
 921
 922 out:
 923         return soc_pcm_ret(rtd, ret);
 924 }
 925
 926 /* PCM prepare ops for non-DPCM streams */
 927 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 928 {
 929         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 930         int ret;
 931
 932         snd_soc_dpcm_mutex_lock(rtd);
 933         ret = __soc_pcm_prepare(rtd, substream);
 934         snd_soc_dpcm_mutex_unlock(rtd);
 935         return ret;
 936 }
 937
 938 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 939                                        unsigned int mask)
 940 {
 941         struct snd_interval *interval;
 942         int channels = hweight_long(mask);
 943
 944         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 945         interval->min = channels;
 946         interval->max = channels;
 947 }
 948
 949 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
 950                             struct snd_pcm_substream *substream, int rollback)
 951 {
 952         struct snd_soc_dai *dai;
 953         int i;
 954
 955         snd_soc_dpcm_mutex_assert_held(rtd);
 956
 957         /* clear the corresponding DAIs parameters when going to be inactive */
 958         for_each_rtd_dais(rtd, i, dai) {
 959                 if (snd_soc_dai_active(dai) == 1)
 960                         soc_pcm_set_dai_params(dai, NULL);
 961
 962                 if (snd_soc_dai_stream_active(dai, substream->stream) == 1) {
 963                         if (dai->driver->ops && !dai->driver->ops->mute_unmute_on_trigger)
 964                                 snd_soc_dai_digital_mute(dai, 1, substream->stream);
 965                 }
 966         }
 967
 968         /* run the stream event */
 969         snd_soc_dapm_stream_stop(rtd, substream->stream);
 970
 971         /* free any machine hw params */
 972         snd_soc_link_hw_free(substream, rollback);
 973
 974         /* free any component resources */
 975         snd_soc_pcm_component_hw_free(substream, rollback);
 976
 977         /* now free hw params for the DAIs  */
 978         for_each_rtd_dais(rtd, i, dai)
 979                 if (snd_soc_dai_stream_valid(dai, substream->stream))
 980                         snd_soc_dai_hw_free(dai, substream, rollback);
 981
 982         return 0;
 983 }
 984
 985 /*
 986  * Frees resources allocated by hw_params, can be called multiple times
 987  */
 988 static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
 989                              struct snd_pcm_substream *substream)
 990 {
 991         return soc_pcm_hw_clean(rtd, substream, 0);
 992 }
 993
 994 /* hw_free PCM ops for non-DPCM streams */
 995 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 996 {
 997         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 998         int ret;
 999
1000         snd_soc_dpcm_mutex_lock(rtd);
1001         ret = __soc_pcm_hw_free(rtd, substream);
1002         snd_soc_dpcm_mutex_unlock(rtd);
1003         return ret;
1004 }
1005
1006 /*
1007  * Called by ALSA when the hardware params are set by application. This
1008  * function can also be called multiple times and can allocate buffers
1009  * (using snd_pcm_lib_* ). It's non-atomic.
1010  */
1011 static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
1012                                struct snd_pcm_substream *substream,
1013                                struct snd_pcm_hw_params *params)
1014 {
1015         struct snd_soc_dai *cpu_dai;
1016         struct snd_soc_dai *codec_dai;
1017         struct snd_pcm_hw_params tmp_params;
1018         int i, ret = 0;
1019
1020         snd_soc_dpcm_mutex_assert_held(rtd);
1021
1022         ret = soc_pcm_params_symmetry(substream, params);
1023         if (ret)
1024                 goto out;
1025
1026         ret = snd_soc_link_hw_params(substream, params);
1027         if (ret < 0)
1028                 goto out;
1029
1030         for_each_rtd_codec_dais(rtd, i, codec_dai) {
1031                 unsigned int tdm_mask = snd_soc_dai_tdm_mask_get(codec_dai, substream->stream);
1032
1033                 /*
1034                  * Skip CODECs which don't support the current stream type,
1035                  * the idea being that if a CODEC is not used for the currently
1036                  * set up transfer direction, it should not need to be
1037                  * configured, especially since the configuration used might
1038                  * not even be supported by that CODEC. There may be cases
1039                  * however where a CODEC needs to be set up although it is
1040                  * actually not being used for the transfer, e.g. if a
1041                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
1042                  * for the DAI link including a playback-only CODEC.
1043                  * If this becomes necessary, we will have to augment the
1044                  * machine driver setup with information on how to act, so
1045                  * we can do the right thing here.
1046                  */
1047                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1048                         continue;
1049
1050                 /* copy params for each codec */
1051                 tmp_params = *params;
1052
1053                 /* fixup params based on TDM slot masks */
1054                 if (tdm_mask)
1055                         soc_pcm_codec_params_fixup(&tmp_params, tdm_mask);
1056
1057                 ret = snd_soc_dai_hw_params(codec_dai, substream,
1058                                             &tmp_params);
1059                 if(ret < 0)
1060                         goto out;
1061
1062                 soc_pcm_set_dai_params(codec_dai, &tmp_params);
1063                 snd_soc_dapm_update_dai(substream, &tmp_params, codec_dai);
1064         }
1065
1066         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1067                 struct snd_soc_dai_link_ch_map *ch_maps;
1068                 unsigned int ch_mask = 0;
1069                 int j;
1070
1071                 /*
1072                  * Skip CPUs which don't support the current stream
1073                  * type. See soc_pcm_init_runtime_hw() for more details
1074                  */
1075                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1076                         continue;
1077
1078                 /* copy params for each cpu */
1079                 tmp_params = *params;
1080
1081                 /*
1082                  * construct cpu channel mask by combining ch_mask of each
1083                  * codec which maps to the cpu.
1084                  * see
1085                  *      soc.h :: [dai_link->ch_maps Image sample]
1086                  */
1087                 for_each_rtd_ch_maps(rtd, j, ch_maps)
1088                         if (ch_maps->cpu == i)
1089                                 ch_mask |= ch_maps->ch_mask;
1090
1091                 /* fixup cpu channel number */
1092                 if (ch_mask)
1093                         soc_pcm_codec_params_fixup(&tmp_params, ch_mask);
1094
1095                 ret = snd_soc_dai_hw_params(cpu_dai, substream, &tmp_params);
1096                 if (ret < 0)
1097                         goto out;
1098
1099                 /* store the parameters for each DAI */
1100                 soc_pcm_set_dai_params(cpu_dai, &tmp_params);
1101                 snd_soc_dapm_update_dai(substream, &tmp_params, cpu_dai);
1102         }
1103
1104         ret = snd_soc_pcm_component_hw_params(substream, params);
1105 out:
1106         if (ret < 0)
1107                 soc_pcm_hw_clean(rtd, substream, 1);
1108
1109         return soc_pcm_ret(rtd, ret);
1110 }
1111
1112 /* hw_params PCM ops for non-DPCM streams */
1113 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
1114                              struct snd_pcm_hw_params *params)
1115 {
1116         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1117         int ret;
1118
1119         snd_soc_dpcm_mutex_lock(rtd);
1120         ret = __soc_pcm_hw_params(rtd, substream, params);
1121         snd_soc_dpcm_mutex_unlock(rtd);
1122         return ret;
1123 }
1124
1125 #define TRIGGER_MAX 3
1126 static int (* const trigger[][TRIGGER_MAX])(struct snd_pcm_substream *substream, int cmd, int rollback) = {
1127         [SND_SOC_TRIGGER_ORDER_DEFAULT] = {
1128                 snd_soc_link_trigger,
1129                 snd_soc_pcm_component_trigger,
1130                 snd_soc_pcm_dai_trigger,
1131         },
1132         [SND_SOC_TRIGGER_ORDER_LDC] = {
1133                 snd_soc_link_trigger,
1134                 snd_soc_pcm_dai_trigger,
1135                 snd_soc_pcm_component_trigger,
1136         },
1137 };
1138
1139 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1140 {
1141         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1142         struct snd_soc_component *component;
1143         int ret = 0, r = 0, i;
1144         int rollback = 0;
1145         int start = 0, stop = 0;
1146
1147         /*
1148          * select START/STOP sequence
1149          */
1150         for_each_rtd_components(rtd, i, component) {
1151                 if (component->driver->trigger_start)
1152                         start = component->driver->trigger_start;
1153                 if (component->driver->trigger_stop)
1154                         stop = component->driver->trigger_stop;
1155         }
1156         if (rtd->dai_link->trigger_start)
1157                 start = rtd->dai_link->trigger_start;
1158         if (rtd->dai_link->trigger_stop)
1159                 stop  = rtd->dai_link->trigger_stop;
1160
1161         if (start < 0 || start >= SND_SOC_TRIGGER_ORDER_MAX ||
1162             stop  < 0 || stop  >= SND_SOC_TRIGGER_ORDER_MAX)
1163                 return -EINVAL;
1164
1165         /*
1166          * START
1167          */
1168         switch (cmd) {
1169         case SNDRV_PCM_TRIGGER_START:
1170         case SNDRV_PCM_TRIGGER_RESUME:
1171         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1172                 for (i = 0; i < TRIGGER_MAX; i++) {
1173                         r = trigger[start][i](substream, cmd, 0);
1174                         if (r < 0)
1175                                 break;
1176                 }
1177         }
1178
1179         /*
1180          * Rollback if START failed
1181          * find correspond STOP command
1182          */
1183         if (r < 0) {
1184                 rollback = 1;
1185                 ret = r;
1186                 switch (cmd) {
1187                 case SNDRV_PCM_TRIGGER_START:
1188                         cmd = SNDRV_PCM_TRIGGER_STOP;
1189                         break;
1190                 case SNDRV_PCM_TRIGGER_RESUME:
1191                         cmd = SNDRV_PCM_TRIGGER_SUSPEND;
1192                         break;
1193                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1194                         cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
1195                         break;
1196                 }
1197         }
1198
1199         /*
1200          * STOP
1201          */
1202         switch (cmd) {
1203         case SNDRV_PCM_TRIGGER_STOP:
1204         case SNDRV_PCM_TRIGGER_SUSPEND:
1205         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1206                 for (i = TRIGGER_MAX; i > 0; i--) {
1207                         r = trigger[stop][i - 1](substream, cmd, rollback);
1208                         if (r < 0)
1209                                 ret = r;
1210                 }
1211         }
1212
1213         return ret;
1214 }
1215
1216 /*
1217  * soc level wrapper for pointer callback
1218  * If cpu_dai, codec_dai, component driver has the delay callback, then
1219  * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
1220  */
1221 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1222 {
1223         struct snd_pcm_runtime *runtime = substream->runtime;
1224         snd_pcm_uframes_t offset = 0;
1225         snd_pcm_sframes_t codec_delay = 0;
1226         snd_pcm_sframes_t cpu_delay = 0;
1227
1228         offset = snd_soc_pcm_component_pointer(substream);
1229
1230         /* should be called *after* snd_soc_pcm_component_pointer() */
1231         snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
1232         snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
1233
1234         runtime->delay = cpu_delay + codec_delay;
1235
1236         return offset;
1237 }
1238
1239 /* connect a FE and BE */
1240 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1241                 struct snd_soc_pcm_runtime *be, int stream)
1242 {
1243         struct snd_pcm_substream *fe_substream;
1244         struct snd_pcm_substream *be_substream;
1245         struct snd_soc_dpcm *dpcm;
1246
1247         snd_soc_dpcm_mutex_assert_held(fe);
1248
1249         /* only add new dpcms */
1250         for_each_dpcm_be(fe, stream, dpcm) {
1251                 if (dpcm->be == be && dpcm->fe == fe)
1252                         return 0;
1253         }
1254
1255         fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1256         be_substream = snd_soc_dpcm_get_substream(be, stream);
1257
1258         if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
1259                 dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
1260                         __func__);
1261                 return -EINVAL;
1262         }
1263         if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
1264                 dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n");
1265                 be_substream->pcm->nonatomic = 1;
1266         }
1267
1268         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1269         if (!dpcm)
1270                 return -ENOMEM;
1271
1272         dpcm->be = be;
1273         dpcm->fe = fe;
1274         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1275         snd_soc_dpcm_stream_lock_irq(fe, stream);
1276         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1277         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1278         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1279
1280         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1281                         stream ? "capture" : "playback",  fe->dai_link->name,
1282                         stream ? "<-" : "->", be->dai_link->name);
1283
1284         dpcm_create_debugfs_state(dpcm, stream);
1285
1286         return 1;
1287 }
1288
1289 /* reparent a BE onto another FE */
1290 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1291                         struct snd_soc_pcm_runtime *be, int stream)
1292 {
1293         struct snd_soc_dpcm *dpcm;
1294         struct snd_pcm_substream *fe_substream, *be_substream;
1295
1296         /* reparent if BE is connected to other FEs */
1297         if (!be->dpcm[stream].users)
1298                 return;
1299
1300         be_substream = snd_soc_dpcm_get_substream(be, stream);
1301         if (!be_substream)
1302                 return;
1303
1304         for_each_dpcm_fe(be, stream, dpcm) {
1305                 if (dpcm->fe == fe)
1306                         continue;
1307
1308                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1309                         stream ? "capture" : "playback",
1310                         dpcm->fe->dai_link->name,
1311                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1312
1313                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1314                 be_substream->runtime = fe_substream->runtime;
1315                 break;
1316         }
1317 }
1318
1319 /* disconnect a BE and FE */
1320 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1321 {
1322         struct snd_soc_dpcm *dpcm, *d;
1323         LIST_HEAD(deleted_dpcms);
1324
1325         snd_soc_dpcm_mutex_assert_held(fe);
1326
1327         snd_soc_dpcm_stream_lock_irq(fe, stream);
1328         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1329                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1330                                 stream ? "capture" : "playback",
1331                                 dpcm->be->dai_link->name);
1332
1333                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1334                         continue;
1335
1336                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1337                         stream ? "capture" : "playback", fe->dai_link->name,
1338                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1339
1340                 /* BEs still alive need new FE */
1341                 dpcm_be_reparent(fe, dpcm->be, stream);
1342
1343                 list_del(&dpcm->list_be);
1344                 list_move(&dpcm->list_fe, &deleted_dpcms);
1345         }
1346         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1347
1348         while (!list_empty(&deleted_dpcms)) {
1349                 dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
1350                                         list_fe);
1351                 list_del(&dpcm->list_fe);
1352                 dpcm_remove_debugfs_state(dpcm);
1353                 kfree(dpcm);
1354         }
1355 }
1356
1357 /* get BE for DAI widget and stream */
1358 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1359                 struct snd_soc_dapm_widget *widget, int stream)
1360 {
1361         struct snd_soc_pcm_runtime *be;
1362         struct snd_soc_dapm_widget *w;
1363         struct snd_soc_dai *dai;
1364         int i;
1365
1366         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1367
1368         for_each_card_rtds(card, be) {
1369
1370                 if (!be->dai_link->no_pcm)
1371                         continue;
1372
1373                 if (!snd_soc_dpcm_get_substream(be, stream))
1374                         continue;
1375
1376                 for_each_rtd_dais(be, i, dai) {
1377                         w = snd_soc_dai_get_widget(dai, stream);
1378
1379                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1380                                 w ? w->name : "(not set)");
1381
1382                         if (w == widget)
1383                                 return be;
1384                 }
1385         }
1386
1387         /* Widget provided is not a BE */
1388         return NULL;
1389 }
1390
1391 int widget_in_list(struct snd_soc_dapm_widget_list *list,
1392                 struct snd_soc_dapm_widget *widget)
1393 {
1394         struct snd_soc_dapm_widget *w;
1395         int i;
1396
1397         for_each_dapm_widgets(list, i, w)
1398                 if (widget == w)
1399                         return 1;
1400
1401         return 0;
1402 }
1403 EXPORT_SYMBOL_GPL(widget_in_list);
1404
1405 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
1406 {
1407         struct snd_soc_card *card = widget->dapm->card;
1408         struct snd_soc_pcm_runtime *rtd;
1409         int stream;
1410
1411         /* adjust dir to stream */
1412         if (dir == SND_SOC_DAPM_DIR_OUT)
1413                 stream = SNDRV_PCM_STREAM_PLAYBACK;
1414         else
1415                 stream = SNDRV_PCM_STREAM_CAPTURE;
1416
1417         rtd = dpcm_get_be(card, widget, stream);
1418         if (rtd)
1419                 return true;
1420
1421         return false;
1422 }
1423 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
1424
1425 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1426         int stream, struct snd_soc_dapm_widget_list **list)
1427 {
1428         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(fe, 0);
1429         int paths;
1430
1431         if (fe->dai_link->num_cpus > 1) {
1432                 dev_err(fe->dev,
1433                         "%s doesn't support Multi CPU yet\n", __func__);
1434                 return -EINVAL;
1435         }
1436
1437         /* get number of valid DAI paths and their widgets */
1438         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1439                         fe->card->component_chaining ?
1440                                 NULL : dpcm_end_walk_at_be);
1441
1442         if (paths > 0)
1443                 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1444                         stream ? "capture" : "playback");
1445         else if (paths == 0)
1446                 dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
1447                          stream ? "capture" : "playback");
1448
1449         return paths;
1450 }
1451
1452 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1453 {
1454         snd_soc_dapm_dai_free_widgets(list);
1455 }
1456
1457 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1458                               struct snd_soc_dapm_widget_list *list)
1459 {
1460         struct snd_soc_dai *dai;
1461         unsigned int i;
1462
1463         /* is there a valid DAI widget for this BE */
1464         for_each_rtd_dais(dpcm->be, i, dai) {
1465                 struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
1466
1467                 /*
1468                  * The BE is pruned only if none of the dai
1469                  * widgets are in the active list.
1470                  */
1471                 if (widget && widget_in_list(list, widget))
1472                         return true;
1473         }
1474
1475         return false;
1476 }
1477
1478 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1479                             struct snd_soc_dapm_widget_list **list_)
1480 {
1481         struct snd_soc_dpcm *dpcm;
1482         int prune = 0;
1483
1484         /* Destroy any old FE <--> BE connections */
1485         for_each_dpcm_be(fe, stream, dpcm) {
1486                 if (dpcm_be_is_active(dpcm, stream, *list_))
1487                         continue;
1488
1489                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1490                         stream ? "capture" : "playback",
1491                         dpcm->be->dai_link->name, fe->dai_link->name);
1492                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1493                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
1494                 prune++;
1495         }
1496
1497         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1498         return prune;
1499 }
1500
1501 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1502         struct snd_soc_dapm_widget_list **list_)
1503 {
1504         struct snd_soc_card *card = fe->card;
1505         struct snd_soc_dapm_widget_list *list = *list_;
1506         struct snd_soc_pcm_runtime *be;
1507         struct snd_soc_dapm_widget *widget;
1508         struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1509         int i, new = 0, err;
1510
1511         /* don't connect if FE is not running */
1512         if (!fe_substream->runtime && !fe->fe_compr)
1513                 return new;
1514
1515         /* Create any new FE <--> BE connections */
1516         for_each_dapm_widgets(list, i, widget) {
1517
1518                 switch (widget->id) {
1519                 case snd_soc_dapm_dai_in:
1520                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1521                                 continue;
1522                         break;
1523                 case snd_soc_dapm_dai_out:
1524                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1525                                 continue;
1526                         break;
1527                 default:
1528                         continue;
1529                 }
1530
1531                 /* is there a valid BE rtd for this widget */
1532                 be = dpcm_get_be(card, widget, stream);
1533                 if (!be) {
1534                         dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
1535                                 widget->name);
1536                         continue;
1537                 }
1538
1539                 /*
1540                  * Filter for systems with 'component_chaining' enabled.
1541                  * This helps to avoid unnecessary re-configuration of an
1542                  * already active BE on such systems.
1543                  */
1544                 if (fe->card->component_chaining &&
1545                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1546                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1547                         continue;
1548
1549                 /* newly connected FE and BE */
1550                 err = dpcm_be_connect(fe, be, stream);
1551                 if (err < 0) {
1552                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1553                                 widget->name);
1554                         break;
1555                 } else if (err == 0) /* already connected */
1556                         continue;
1557
1558                 /* new */
1559                 dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
1560                 new++;
1561         }
1562
1563         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1564         return new;
1565 }
1566
1567 /*
1568  * Find the corresponding BE DAIs that source or sink audio to this
1569  * FE substream.
1570  */
1571 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1572         int stream, struct snd_soc_dapm_widget_list **list, int new)
1573 {
1574         if (new)
1575                 return dpcm_add_paths(fe, stream, list);
1576         else
1577                 return dpcm_prune_paths(fe, stream, list);
1578 }
1579
1580 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1581 {
1582         struct snd_soc_dpcm *dpcm;
1583
1584         for_each_dpcm_be(fe, stream, dpcm)
1585                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
1586 }
1587
1588 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
1589                       int do_hw_free, struct snd_soc_dpcm *last)
1590 {
1591         struct snd_soc_dpcm *dpcm;
1592
1593         /* disable any enabled and non active backends */
1594         for_each_dpcm_be(fe, stream, dpcm) {
1595                 struct snd_soc_pcm_runtime *be = dpcm->be;
1596                 struct snd_pcm_substream *be_substream =
1597                         snd_soc_dpcm_get_substream(be, stream);
1598
1599                 if (dpcm == last)
1600                         return;
1601
1602                 /* is this op for this BE ? */
1603                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1604                         continue;
1605
1606                 if (be->dpcm[stream].users == 0) {
1607                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1608                                 stream ? "capture" : "playback",
1609                                 be->dpcm[stream].state);
1610                         continue;
1611                 }
1612
1613                 if (--be->dpcm[stream].users != 0)
1614                         continue;
1615
1616                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
1617                         if (!do_hw_free)
1618                                 continue;
1619
1620                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
1621                                 __soc_pcm_hw_free(be, be_substream);
1622                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1623                         }
1624                 }
1625
1626                 __soc_pcm_close(be, be_substream);
1627                 be_substream->runtime = NULL;
1628                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1629         }
1630 }
1631
1632 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1633 {
1634         struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1635         struct snd_soc_pcm_runtime *be;
1636         struct snd_soc_dpcm *dpcm;
1637         int err, count = 0;
1638
1639         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1640         for_each_dpcm_be(fe, stream, dpcm) {
1641                 struct snd_pcm_substream *be_substream;
1642
1643                 be = dpcm->be;
1644                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1645
1646                 if (!be_substream) {
1647                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1648                                 stream ? "capture" : "playback");
1649                         continue;
1650                 }
1651
1652                 /* is this op for this BE ? */
1653                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1654                         continue;
1655
1656                 /* first time the dpcm is open ? */
1657                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
1658                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1659                                 stream ? "capture" : "playback",
1660                                 be->dpcm[stream].state);
1661                         continue;
1662                 }
1663
1664                 if (be->dpcm[stream].users++ != 0)
1665                         continue;
1666
1667                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1668                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1669                         continue;
1670
1671                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1672                         stream ? "capture" : "playback", be->dai_link->name);
1673
1674                 be_substream->runtime = fe_substream->runtime;
1675                 err = __soc_pcm_open(be, be_substream);
1676                 if (err < 0) {
1677                         be->dpcm[stream].users--;
1678                         if (be->dpcm[stream].users < 0)
1679                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1680                                         stream ? "capture" : "playback",
1681                                         be->dpcm[stream].state);
1682
1683                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1684                         goto unwind;
1685                 }
1686                 be->dpcm[stream].be_start = 0;
1687                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1688                 count++;
1689         }
1690
1691         return count;
1692
1693 unwind:
1694         dpcm_be_dai_startup_rollback(fe, stream, dpcm);
1695
1696         return soc_pcm_ret(fe, err);
1697 }
1698
1699 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
1700 {
1701         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1702         struct snd_pcm_runtime *runtime = substream->runtime;
1703         struct snd_pcm_hardware *hw = &runtime->hw;
1704         struct snd_soc_dai *dai;
1705         int stream = substream->stream;
1706         u64 formats = hw->formats;
1707         int i;
1708
1709         soc_pcm_hw_init(hw);
1710
1711         if (formats)
1712                 hw->formats &= formats;
1713
1714         for_each_rtd_cpu_dais(fe, i, dai) {
1715                 struct snd_soc_pcm_stream *cpu_stream;
1716
1717                 /*
1718                  * Skip CPUs which don't support the current stream
1719                  * type. See soc_pcm_init_runtime_hw() for more details
1720                  */
1721                 if (!snd_soc_dai_stream_valid(dai, stream))
1722                         continue;
1723
1724                 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1725
1726                 soc_pcm_hw_update_rate(hw, cpu_stream);
1727                 soc_pcm_hw_update_chan(hw, cpu_stream);
1728                 soc_pcm_hw_update_format(hw, cpu_stream);
1729                 soc_pcm_hw_update_subformat(hw, cpu_stream);
1730         }
1731
1732 }
1733
1734 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
1735 {
1736         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1737         struct snd_pcm_runtime *runtime = substream->runtime;
1738         struct snd_pcm_hardware *hw = &runtime->hw;
1739         struct snd_soc_dpcm *dpcm;
1740         struct snd_soc_dai *dai;
1741         int stream = substream->stream;
1742
1743         if (!fe->dai_link->dpcm_merged_format)
1744                 return;
1745
1746         /*
1747          * It returns merged BE codec format
1748          * if FE want to use it (= dpcm_merged_format)
1749          */
1750
1751         for_each_dpcm_be(fe, stream, dpcm) {
1752                 struct snd_soc_pcm_runtime *be = dpcm->be;
1753                 struct snd_soc_pcm_stream *codec_stream;
1754                 int i;
1755
1756                 for_each_rtd_codec_dais(be, i, dai) {
1757                         /*
1758                          * Skip CODECs which don't support the current stream
1759                          * type. See soc_pcm_init_runtime_hw() for more details
1760                          */
1761                         if (!snd_soc_dai_stream_valid(dai, stream))
1762                                 continue;
1763
1764                         codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1765
1766                         soc_pcm_hw_update_format(hw, codec_stream);
1767                         soc_pcm_hw_update_subformat(hw, codec_stream);
1768                 }
1769         }
1770 }
1771
1772 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
1773 {
1774         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1775         struct snd_pcm_runtime *runtime = substream->runtime;
1776         struct snd_pcm_hardware *hw = &runtime->hw;
1777         struct snd_soc_dpcm *dpcm;
1778         int stream = substream->stream;
1779
1780         if (!fe->dai_link->dpcm_merged_chan)
1781                 return;
1782
1783         /*
1784          * It returns merged BE codec channel;
1785          * if FE want to use it (= dpcm_merged_chan)
1786          */
1787
1788         for_each_dpcm_be(fe, stream, dpcm) {
1789                 struct snd_soc_pcm_runtime *be = dpcm->be;
1790                 struct snd_soc_pcm_stream *cpu_stream;
1791                 struct snd_soc_dai *dai;
1792                 int i;
1793
1794                 for_each_rtd_cpu_dais(be, i, dai) {
1795                         /*
1796                          * Skip CPUs which don't support the current stream
1797                          * type. See soc_pcm_init_runtime_hw() for more details
1798                          */
1799                         if (!snd_soc_dai_stream_valid(dai, stream))
1800                                 continue;
1801
1802                         cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1803
1804                         soc_pcm_hw_update_chan(hw, cpu_stream);
1805                 }
1806
1807                 /*
1808                  * chan min/max cannot be enforced if there are multiple CODEC
1809                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1810                  */
1811                 if (be->dai_link->num_codecs == 1) {
1812                         struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
1813                                 snd_soc_rtd_to_codec(be, 0), stream);
1814
1815                         soc_pcm_hw_update_chan(hw, codec_stream);
1816                 }
1817         }
1818 }
1819
1820 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
1821 {
1822         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1823         struct snd_pcm_runtime *runtime = substream->runtime;
1824         struct snd_pcm_hardware *hw = &runtime->hw;
1825         struct snd_soc_dpcm *dpcm;
1826         int stream = substream->stream;
1827
1828         if (!fe->dai_link->dpcm_merged_rate)
1829                 return;
1830
1831         /*
1832          * It returns merged BE codec channel;
1833          * if FE want to use it (= dpcm_merged_chan)
1834          */
1835
1836         for_each_dpcm_be(fe, stream, dpcm) {
1837                 struct snd_soc_pcm_runtime *be = dpcm->be;
1838                 struct snd_soc_pcm_stream *pcm;
1839                 struct snd_soc_dai *dai;
1840                 int i;
1841
1842                 for_each_rtd_dais(be, i, dai) {
1843                         /*
1844                          * Skip DAIs which don't support the current stream
1845                          * type. See soc_pcm_init_runtime_hw() for more details
1846                          */
1847                         if (!snd_soc_dai_stream_valid(dai, stream))
1848                                 continue;
1849
1850                         pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1851
1852                         soc_pcm_hw_update_rate(hw, pcm);
1853                 }
1854         }
1855 }
1856
1857 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1858                                int stream)
1859 {
1860         struct snd_soc_dpcm *dpcm;
1861         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
1862         struct snd_soc_dai *fe_cpu_dai;
1863         int err = 0;
1864         int i;
1865
1866         /* apply symmetry for FE */
1867         soc_pcm_update_symmetry(fe_substream);
1868
1869         for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1870                 /* Symmetry only applies if we've got an active stream. */
1871                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1872                 if (err < 0)
1873                         goto error;
1874         }
1875
1876         /* apply symmetry for BE */
1877         for_each_dpcm_be(fe, stream, dpcm) {
1878                 struct snd_soc_pcm_runtime *be = dpcm->be;
1879                 struct snd_pcm_substream *be_substream =
1880                         snd_soc_dpcm_get_substream(be, stream);
1881                 struct snd_soc_pcm_runtime *rtd;
1882                 struct snd_soc_dai *dai;
1883
1884                 /* A backend may not have the requested substream */
1885                 if (!be_substream)
1886                         continue;
1887
1888                 rtd = snd_soc_substream_to_rtd(be_substream);
1889                 if (rtd->dai_link->be_hw_params_fixup)
1890                         continue;
1891
1892                 soc_pcm_update_symmetry(be_substream);
1893
1894                 /* Symmetry only applies if we've got an active stream. */
1895                 for_each_rtd_dais(rtd, i, dai) {
1896                         err = soc_pcm_apply_symmetry(fe_substream, dai);
1897                         if (err < 0)
1898                                 goto error;
1899                 }
1900         }
1901 error:
1902         return soc_pcm_ret(fe, err);
1903 }
1904
1905 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1906 {
1907         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
1908         int stream = fe_substream->stream, ret = 0;
1909
1910         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1911
1912         ret = dpcm_be_dai_startup(fe, stream);
1913         if (ret < 0)
1914                 goto be_err;
1915
1916         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1917
1918         /* start the DAI frontend */
1919         ret = __soc_pcm_open(fe, fe_substream);
1920         if (ret < 0)
1921                 goto unwind;
1922
1923         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1924
1925         dpcm_runtime_setup_fe(fe_substream);
1926
1927         dpcm_runtime_setup_be_format(fe_substream);
1928         dpcm_runtime_setup_be_chan(fe_substream);
1929         dpcm_runtime_setup_be_rate(fe_substream);
1930
1931         ret = dpcm_apply_symmetry(fe_substream, stream);
1932
1933 unwind:
1934         if (ret < 0)
1935                 dpcm_be_dai_startup_unwind(fe, stream);
1936 be_err:
1937         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1938
1939         return soc_pcm_ret(fe, ret);
1940 }
1941
1942 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1943 {
1944         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1945         int stream = substream->stream;
1946
1947         snd_soc_dpcm_mutex_assert_held(fe);
1948
1949         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1950
1951         /* shutdown the BEs */
1952         dpcm_be_dai_shutdown(fe, stream);
1953
1954         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1955
1956         /* now shutdown the frontend */
1957         __soc_pcm_close(fe, substream);
1958
1959         /* run the stream stop event */
1960         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1961
1962         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1963         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1964         return 0;
1965 }
1966
1967 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1968 {
1969         struct snd_soc_dpcm *dpcm;
1970
1971         /* only hw_params backends that are either sinks or sources
1972          * to this frontend DAI */
1973         for_each_dpcm_be(fe, stream, dpcm) {
1974
1975                 struct snd_soc_pcm_runtime *be = dpcm->be;
1976                 struct snd_pcm_substream *be_substream =
1977                         snd_soc_dpcm_get_substream(be, stream);
1978
1979                 /* is this op for this BE ? */
1980                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1981                         continue;
1982
1983                 /* only free hw when no longer used - check all FEs */
1984                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1985                                 continue;
1986
1987                 /* do not free hw if this BE is used by other FE */
1988                 if (be->dpcm[stream].users > 1)
1989                         continue;
1990
1991                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1992                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1993                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1994                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1995                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1996                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1997                         continue;
1998
1999                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
2000                         be->dai_link->name);
2001
2002                 __soc_pcm_hw_free(be, be_substream);
2003
2004                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2005         }
2006 }
2007
2008 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
2009 {
2010         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2011         int stream = substream->stream;
2012
2013         snd_soc_dpcm_mutex_lock(fe);
2014         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2015
2016         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
2017
2018         /* call hw_free on the frontend */
2019         soc_pcm_hw_clean(fe, substream, 0);
2020
2021         /* only hw_params backends that are either sinks or sources
2022          * to this frontend DAI */
2023         dpcm_be_dai_hw_free(fe, stream);
2024
2025         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2026         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2027
2028         snd_soc_dpcm_mutex_unlock(fe);
2029         return 0;
2030 }
2031
2032 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
2033 {
2034         struct snd_soc_pcm_runtime *be;
2035         struct snd_pcm_substream *be_substream;
2036         struct snd_soc_dpcm *dpcm;
2037         int ret;
2038
2039         for_each_dpcm_be(fe, stream, dpcm) {
2040                 struct snd_pcm_hw_params hw_params;
2041
2042                 be = dpcm->be;
2043                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2044
2045                 /* is this op for this BE ? */
2046                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2047                         continue;
2048
2049                 /* copy params for each dpcm */
2050                 memcpy(&hw_params, &fe->dpcm[stream].hw_params,
2051                                 sizeof(struct snd_pcm_hw_params));
2052
2053                 /* perform any hw_params fixups */
2054                 ret = snd_soc_link_be_hw_params_fixup(be, &hw_params);
2055                 if (ret < 0)
2056                         goto unwind;
2057
2058                 /* copy the fixed-up hw params for BE dai */
2059                 memcpy(&be->dpcm[stream].hw_params, &hw_params,
2060                        sizeof(struct snd_pcm_hw_params));
2061
2062                 /* only allow hw_params() if no connected FEs are running */
2063                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2064                         continue;
2065
2066                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2067                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2068                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2069                         continue;
2070
2071                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2072                         be->dai_link->name);
2073
2074                 ret = __soc_pcm_hw_params(be, be_substream, &hw_params);
2075                 if (ret < 0)
2076                         goto unwind;
2077
2078                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2079         }
2080         return 0;
2081
2082 unwind:
2083         dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2084                 __func__, be->dai_link->name, ret);
2085
2086         /* disable any enabled and non active backends */
2087         for_each_dpcm_be_rollback(fe, stream, dpcm) {
2088                 be = dpcm->be;
2089                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2090
2091                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2092                         continue;
2093
2094                 /* only allow hw_free() if no connected FEs are running */
2095                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2096                         continue;
2097
2098                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2099                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2100                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2101                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2102                         continue;
2103
2104                 __soc_pcm_hw_free(be, be_substream);
2105         }
2106
2107         return ret;
2108 }
2109
2110 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2111                                  struct snd_pcm_hw_params *params)
2112 {
2113         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2114         int ret, stream = substream->stream;
2115
2116         snd_soc_dpcm_mutex_lock(fe);
2117         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2118
2119         memcpy(&fe->dpcm[stream].hw_params, params,
2120                         sizeof(struct snd_pcm_hw_params));
2121         ret = dpcm_be_dai_hw_params(fe, stream);
2122         if (ret < 0)
2123                 goto out;
2124
2125         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2126                         fe->dai_link->name, params_rate(params),
2127                         params_channels(params), params_format(params));
2128
2129         /* call hw_params on the frontend */
2130         ret = __soc_pcm_hw_params(fe, substream, params);
2131         if (ret < 0)
2132                 dpcm_be_dai_hw_free(fe, stream);
2133         else
2134                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2135
2136 out:
2137         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2138         snd_soc_dpcm_mutex_unlock(fe);
2139
2140         return soc_pcm_ret(fe, ret);
2141 }
2142
2143 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2144                                int cmd)
2145 {
2146         struct snd_soc_pcm_runtime *be;
2147         bool pause_stop_transition;
2148         struct snd_soc_dpcm *dpcm;
2149         unsigned long flags;
2150         int ret = 0;
2151
2152         for_each_dpcm_be(fe, stream, dpcm) {
2153                 struct snd_pcm_substream *be_substream;
2154
2155                 be = dpcm->be;
2156                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2157
2158                 snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
2159
2160                 /* is this op for this BE ? */
2161                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2162                         goto next;
2163
2164                 dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
2165                         be->dai_link->name, cmd);
2166
2167                 switch (cmd) {
2168                 case SNDRV_PCM_TRIGGER_START:
2169                         if (!be->dpcm[stream].be_start &&
2170                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2171                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2172                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2173                                 goto next;
2174
2175                         be->dpcm[stream].be_start++;
2176                         if (be->dpcm[stream].be_start != 1)
2177                                 goto next;
2178
2179                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
2180                                 ret = soc_pcm_trigger(be_substream,
2181                                                       SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
2182                         else
2183                                 ret = soc_pcm_trigger(be_substream,
2184                                                       SNDRV_PCM_TRIGGER_START);
2185                         if (ret) {
2186                                 be->dpcm[stream].be_start--;
2187                                 goto next;
2188                         }
2189
2190                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2191                         break;
2192                 case SNDRV_PCM_TRIGGER_RESUME:
2193                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2194                                 goto next;
2195
2196                         be->dpcm[stream].be_start++;
2197                         if (be->dpcm[stream].be_start != 1)
2198                                 goto next;
2199
2200                         ret = soc_pcm_trigger(be_substream, cmd);
2201                         if (ret) {
2202                                 be->dpcm[stream].be_start--;
2203                                 goto next;
2204                         }
2205
2206                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2207                         break;
2208                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2209                         if (!be->dpcm[stream].be_start &&
2210                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2211                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2212                                 goto next;
2213
2214                         fe->dpcm[stream].fe_pause = false;
2215                         be->dpcm[stream].be_pause--;
2216
2217                         be->dpcm[stream].be_start++;
2218                         if (be->dpcm[stream].be_start != 1)
2219                                 goto next;
2220
2221                         ret = soc_pcm_trigger(be_substream, cmd);
2222                         if (ret) {
2223                                 be->dpcm[stream].be_start--;
2224                                 goto next;
2225                         }
2226
2227                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2228                         break;
2229                 case SNDRV_PCM_TRIGGER_STOP:
2230                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2231                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2232                                 goto next;
2233
2234                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2235                                 be->dpcm[stream].be_start--;
2236
2237                         if (be->dpcm[stream].be_start != 0)
2238                                 goto next;
2239
2240                         pause_stop_transition = false;
2241                         if (fe->dpcm[stream].fe_pause) {
2242                                 pause_stop_transition = true;
2243                                 fe->dpcm[stream].fe_pause = false;
2244                                 be->dpcm[stream].be_pause--;
2245                         }
2246
2247                         if (be->dpcm[stream].be_pause != 0)
2248                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
2249                         else
2250                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
2251
2252                         if (ret) {
2253                                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2254                                         be->dpcm[stream].be_start++;
2255                                 if (pause_stop_transition) {
2256                                         fe->dpcm[stream].fe_pause = true;
2257                                         be->dpcm[stream].be_pause++;
2258                                 }
2259                                 goto next;
2260                         }
2261
2262                         if (be->dpcm[stream].be_pause != 0)
2263                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2264                         else
2265                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2266
2267                         break;
2268                 case SNDRV_PCM_TRIGGER_SUSPEND:
2269                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2270                                 goto next;
2271
2272                         be->dpcm[stream].be_start--;
2273                         if (be->dpcm[stream].be_start != 0)
2274                                 goto next;
2275
2276                         ret = soc_pcm_trigger(be_substream, cmd);
2277                         if (ret) {
2278                                 be->dpcm[stream].be_start++;
2279                                 goto next;
2280                         }
2281
2282                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2283                         break;
2284                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2285                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2286                                 goto next;
2287
2288                         fe->dpcm[stream].fe_pause = true;
2289                         be->dpcm[stream].be_pause++;
2290
2291                         be->dpcm[stream].be_start--;
2292                         if (be->dpcm[stream].be_start != 0)
2293                                 goto next;
2294
2295                         ret = soc_pcm_trigger(be_substream, cmd);
2296                         if (ret) {
2297                                 be->dpcm[stream].be_start++;
2298                                 goto next;
2299                         }
2300
2301                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2302                         break;
2303                 }
2304 next:
2305                 snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
2306                 if (ret)
2307                         break;
2308         }
2309         return soc_pcm_ret(fe, ret);
2310 }
2311 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2312
2313 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2314                                   int cmd, bool fe_first)
2315 {
2316         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2317         int ret;
2318
2319         /* call trigger on the frontend before the backend. */
2320         if (fe_first) {
2321                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2322                         fe->dai_link->name, cmd);
2323
2324                 ret = soc_pcm_trigger(substream, cmd);
2325                 if (ret < 0)
2326                         return ret;
2327
2328                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2329                 return ret;
2330         }
2331
2332         /* call trigger on the frontend after the backend. */
2333         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2334         if (ret < 0)
2335                 return ret;
2336
2337         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2338                 fe->dai_link->name, cmd);
2339
2340         ret = soc_pcm_trigger(substream, cmd);
2341
2342         return ret;
2343 }
2344
2345 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2346 {
2347         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2348         int stream = substream->stream;
2349         int ret = 0;
2350         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2351
2352         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2353
2354         switch (trigger) {
2355         case SND_SOC_DPCM_TRIGGER_PRE:
2356                 switch (cmd) {
2357                 case SNDRV_PCM_TRIGGER_START:
2358                 case SNDRV_PCM_TRIGGER_RESUME:
2359                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2360                 case SNDRV_PCM_TRIGGER_DRAIN:
2361                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2362                         break;
2363                 case SNDRV_PCM_TRIGGER_STOP:
2364                 case SNDRV_PCM_TRIGGER_SUSPEND:
2365                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2366                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2367                         break;
2368                 default:
2369                         ret = -EINVAL;
2370                         break;
2371                 }
2372                 break;
2373         case SND_SOC_DPCM_TRIGGER_POST:
2374                 switch (cmd) {
2375                 case SNDRV_PCM_TRIGGER_START:
2376                 case SNDRV_PCM_TRIGGER_RESUME:
2377                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2378                 case SNDRV_PCM_TRIGGER_DRAIN:
2379                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2380                         break;
2381                 case SNDRV_PCM_TRIGGER_STOP:
2382                 case SNDRV_PCM_TRIGGER_SUSPEND:
2383                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2384                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2385                         break;
2386                 default:
2387                         ret = -EINVAL;
2388                         break;
2389                 }
2390                 break;
2391         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2392                 /* bespoke trigger() - handles both FE and BEs */
2393
2394                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2395                                 fe->dai_link->name, cmd);
2396
2397                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2398                 break;
2399         default:
2400                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2401                                 fe->dai_link->name);
2402                 ret = -EINVAL;
2403                 goto out;
2404         }
2405
2406         if (ret < 0) {
2407                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2408                         cmd, ret);
2409                 goto out;
2410         }
2411
2412         switch (cmd) {
2413         case SNDRV_PCM_TRIGGER_START:
2414         case SNDRV_PCM_TRIGGER_RESUME:
2415         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2416                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2417                 break;
2418         case SNDRV_PCM_TRIGGER_STOP:
2419         case SNDRV_PCM_TRIGGER_SUSPEND:
2420                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2421                 break;
2422         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2423                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2424                 break;
2425         }
2426
2427 out:
2428         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2429         return ret;
2430 }
2431
2432 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2433 {
2434         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2435         int stream = substream->stream;
2436
2437         /* if FE's runtime_update is already set, we're in race;
2438          * process this trigger later at exit
2439          */
2440         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2441                 fe->dpcm[stream].trigger_pending = cmd + 1;
2442                 return 0; /* delayed, assuming it's successful */
2443         }
2444
2445         /* we're alone, let's trigger */
2446         return dpcm_fe_dai_do_trigger(substream, cmd);
2447 }
2448
2449 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2450 {
2451         struct snd_soc_dpcm *dpcm;
2452         int ret = 0;
2453
2454         for_each_dpcm_be(fe, stream, dpcm) {
2455
2456                 struct snd_soc_pcm_runtime *be = dpcm->be;
2457                 struct snd_pcm_substream *be_substream =
2458                         snd_soc_dpcm_get_substream(be, stream);
2459
2460                 /* is this op for this BE ? */
2461                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2462                         continue;
2463
2464                 if (!snd_soc_dpcm_can_be_prepared(fe, be, stream))
2465                         continue;
2466
2467                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2468                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2469                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2470                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2471                         continue;
2472
2473                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2474                         be->dai_link->name);
2475
2476                 ret = __soc_pcm_prepare(be, be_substream);
2477                 if (ret < 0)
2478                         break;
2479
2480                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2481         }
2482
2483         return soc_pcm_ret(fe, ret);
2484 }
2485
2486 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2487 {
2488         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2489         int stream = substream->stream, ret = 0;
2490
2491         snd_soc_dpcm_mutex_lock(fe);
2492
2493         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2494
2495         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2496
2497         /* there is no point preparing this FE if there are no BEs */
2498         if (list_empty(&fe->dpcm[stream].be_clients)) {
2499                 /* dev_err_once() for visibility, dev_dbg() for debugging UCM profiles */
2500                 dev_err_once(fe->dev, "ASoC: no backend DAIs enabled for %s, possibly missing ALSA mixer-based routing or UCM profile\n",
2501                              fe->dai_link->name);
2502                 dev_dbg(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2503                         fe->dai_link->name);
2504                 ret = -EINVAL;
2505                 goto out;
2506         }
2507
2508         ret = dpcm_be_dai_prepare(fe, stream);
2509         if (ret < 0)
2510                 goto out;
2511
2512         /* call prepare on the frontend */
2513         ret = __soc_pcm_prepare(fe, substream);
2514         if (ret < 0)
2515                 goto out;
2516
2517         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2518
2519 out:
2520         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2521         snd_soc_dpcm_mutex_unlock(fe);
2522
2523         return soc_pcm_ret(fe, ret);
2524 }
2525
2526 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2527 {
2528         struct snd_pcm_substream *substream =
2529                 snd_soc_dpcm_get_substream(fe, stream);
2530         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2531         int err;
2532
2533         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2534                         stream ? "capture" : "playback", fe->dai_link->name);
2535
2536         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2537                 /* call bespoke trigger - FE takes care of all BE triggers */
2538                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2539                                 fe->dai_link->name);
2540
2541                 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2542         } else {
2543                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2544                         fe->dai_link->name);
2545
2546                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2547         }
2548
2549         dpcm_be_dai_hw_free(fe, stream);
2550
2551         dpcm_be_dai_shutdown(fe, stream);
2552
2553         /* run the stream event for each BE */
2554         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2555
2556         return soc_pcm_ret(fe, err);
2557 }
2558
2559 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2560 {
2561         struct snd_pcm_substream *substream =
2562                 snd_soc_dpcm_get_substream(fe, stream);
2563         struct snd_soc_dpcm *dpcm;
2564         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2565         int ret = 0;
2566
2567         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2568                         stream ? "capture" : "playback", fe->dai_link->name);
2569
2570         /* Only start the BE if the FE is ready */
2571         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2572                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
2573                 dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
2574                         fe->dai_link->name, fe->dpcm[stream].state);
2575                 ret = -EINVAL;
2576                 goto disconnect;
2577         }
2578
2579         /* startup must always be called for new BEs */
2580         ret = dpcm_be_dai_startup(fe, stream);
2581         if (ret < 0)
2582                 goto disconnect;
2583
2584         /* keep going if FE state is > open */
2585         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2586                 return 0;
2587
2588         ret = dpcm_be_dai_hw_params(fe, stream);
2589         if (ret < 0)
2590                 goto close;
2591
2592         /* keep going if FE state is > hw_params */
2593         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2594                 return 0;
2595
2596         ret = dpcm_be_dai_prepare(fe, stream);
2597         if (ret < 0)
2598                 goto hw_free;
2599
2600         /* run the stream event for each BE */
2601         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2602
2603         /* keep going if FE state is > prepare */
2604         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2605                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2606                 return 0;
2607
2608         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2609                 /* call trigger on the frontend - FE takes care of all BE triggers */
2610                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2611                                 fe->dai_link->name);
2612
2613                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2614                 if (ret < 0)
2615                         goto hw_free;
2616         } else {
2617                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2618                         fe->dai_link->name);
2619
2620                 ret = dpcm_be_dai_trigger(fe, stream,
2621                                         SNDRV_PCM_TRIGGER_START);
2622                 if (ret < 0)
2623                         goto hw_free;
2624         }
2625
2626         return 0;
2627
2628 hw_free:
2629         dpcm_be_dai_hw_free(fe, stream);
2630 close:
2631         dpcm_be_dai_shutdown(fe, stream);
2632 disconnect:
2633         /* disconnect any pending BEs */
2634         for_each_dpcm_be(fe, stream, dpcm) {
2635                 struct snd_soc_pcm_runtime *be = dpcm->be;
2636
2637                 /* is this op for this BE ? */
2638                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2639                         continue;
2640
2641                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
2642                         be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
2643                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2644         }
2645
2646         return soc_pcm_ret(fe, ret);
2647 }
2648
2649 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2650 {
2651         struct snd_soc_dapm_widget_list *list;
2652         int stream;
2653         int count, paths;
2654
2655         if (!fe->dai_link->dynamic)
2656                 return 0;
2657
2658         if (fe->dai_link->num_cpus > 1) {
2659                 dev_err(fe->dev,
2660                         "%s doesn't support Multi CPU yet\n", __func__);
2661                 return -EINVAL;
2662         }
2663
2664         /* only check active links */
2665         if (!snd_soc_dai_active(snd_soc_rtd_to_cpu(fe, 0)))
2666                 return 0;
2667
2668         /* DAPM sync will call this to update DSP paths */
2669         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2670                 new ? "new" : "old", fe->dai_link->name);
2671
2672         for_each_pcm_streams(stream) {
2673
2674                 /* skip if FE doesn't have playback/capture capability */
2675                 if (!snd_soc_dai_stream_valid(snd_soc_rtd_to_cpu(fe, 0),   stream) ||
2676                     !snd_soc_dai_stream_valid(snd_soc_rtd_to_codec(fe, 0), stream))
2677                         continue;
2678
2679                 /* skip if FE isn't currently playing/capturing */
2680                 if (!snd_soc_dai_stream_active(snd_soc_rtd_to_cpu(fe, 0), stream) ||
2681                     !snd_soc_dai_stream_active(snd_soc_rtd_to_codec(fe, 0), stream))
2682                         continue;
2683
2684                 paths = dpcm_path_get(fe, stream, &list);
2685                 if (paths < 0)
2686                         return paths;
2687
2688                 /* update any playback/capture paths */
2689                 count = dpcm_process_paths(fe, stream, &list, new);
2690                 if (count) {
2691                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2692                         if (new)
2693                                 dpcm_run_update_startup(fe, stream);
2694                         else
2695                                 dpcm_run_update_shutdown(fe, stream);
2696                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2697
2698                         dpcm_clear_pending_state(fe, stream);
2699                         dpcm_be_disconnect(fe, stream);
2700                 }
2701
2702                 dpcm_path_put(&list);
2703         }
2704
2705         return 0;
2706 }
2707
2708 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2709  * any DAI links.
2710  */
2711 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2712 {
2713         struct snd_soc_pcm_runtime *fe;
2714         int ret = 0;
2715
2716         snd_soc_dpcm_mutex_lock(card);
2717         /* shutdown all old paths first */
2718         for_each_card_rtds(card, fe) {
2719                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2720                 if (ret)
2721                         goto out;
2722         }
2723
2724         /* bring new paths up */
2725         for_each_card_rtds(card, fe) {
2726                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2727                 if (ret)
2728                         goto out;
2729         }
2730
2731 out:
2732         snd_soc_dpcm_mutex_unlock(card);
2733         return ret;
2734 }
2735 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2736
2737 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2738 {
2739         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
2740         struct snd_soc_dpcm *dpcm;
2741         int stream = fe_substream->stream;
2742
2743         snd_soc_dpcm_mutex_assert_held(fe);
2744
2745         /* mark FE's links ready to prune */
2746         for_each_dpcm_be(fe, stream, dpcm)
2747                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2748
2749         dpcm_be_disconnect(fe, stream);
2750 }
2751
2752 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2753 {
2754         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
2755         int ret;
2756
2757         snd_soc_dpcm_mutex_lock(fe);
2758         ret = dpcm_fe_dai_shutdown(fe_substream);
2759
2760         dpcm_fe_dai_cleanup(fe_substream);
2761
2762         snd_soc_dpcm_mutex_unlock(fe);
2763         return ret;
2764 }
2765
2766 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2767 {
2768         struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
2769         struct snd_soc_dapm_widget_list *list;
2770         int ret;
2771         int stream = fe_substream->stream;
2772
2773         snd_soc_dpcm_mutex_lock(fe);
2774
2775         ret = dpcm_path_get(fe, stream, &list);
2776         if (ret < 0)
2777                 goto open_end;
2778
2779         /* calculate valid and active FE <-> BE dpcms */
2780         dpcm_process_paths(fe, stream, &list, 1);
2781
2782         ret = dpcm_fe_dai_startup(fe_substream);
2783         if (ret < 0)
2784                 dpcm_fe_dai_cleanup(fe_substream);
2785
2786         dpcm_clear_pending_state(fe, stream);
2787         dpcm_path_put(&list);
2788 open_end:
2789         snd_soc_dpcm_mutex_unlock(fe);
2790         return ret;
2791 }
2792
2793 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
2794                                     int *playback, int *capture)
2795 {
2796         struct snd_soc_dai_link *dai_link = rtd->dai_link;
2797         struct snd_soc_dai *cpu_dai;
2798         int has_playback = 0;
2799         int has_capture  = 0;
2800         int i;
2801
2802         if (dai_link->dynamic && dai_link->num_cpus > 1) {
2803                 dev_err(rtd->dev, "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2804                 return -EINVAL;
2805         }
2806
2807         if (dai_link->dynamic || dai_link->no_pcm) {
2808                 int stream;
2809
2810                 if (dai_link->dpcm_playback) {
2811                         stream = SNDRV_PCM_STREAM_PLAYBACK;
2812
2813                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2814                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2815                                         has_playback = 1;
2816                                         break;
2817                                 }
2818                         }
2819                         if (!has_playback) {
2820                                 dev_err(rtd->card->dev,
2821                                         "No CPU DAIs support playback for stream %s\n",
2822                                         dai_link->stream_name);
2823                                 return -EINVAL;
2824                         }
2825                 }
2826                 if (dai_link->dpcm_capture) {
2827                         stream = SNDRV_PCM_STREAM_CAPTURE;
2828
2829                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2830                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2831                                         has_capture = 1;
2832                                         break;
2833                                 }
2834                         }
2835
2836                         if (!has_capture) {
2837                                 dev_err(rtd->card->dev,
2838                                         "No CPU DAIs support capture for stream %s\n",
2839                                         dai_link->stream_name);
2840                                 return -EINVAL;
2841                         }
2842                 }
2843         } else {
2844                 struct snd_soc_dai_link_ch_map *ch_maps;
2845                 struct snd_soc_dai *codec_dai;
2846
2847                 /* Adapt stream for codec2codec links */
2848                 int cpu_capture  = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_CAPTURE);
2849                 int cpu_playback = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_PLAYBACK);
2850
2851                 /*
2852                  * see
2853                  *      soc.h :: [dai_link->ch_maps Image sample]
2854                  */
2855                 for_each_rtd_ch_maps(rtd, i, ch_maps) {
2856                         cpu_dai   = snd_soc_rtd_to_cpu(rtd,   ch_maps->cpu);
2857                         codec_dai = snd_soc_rtd_to_codec(rtd, ch_maps->codec);
2858
2859                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2860                             snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2861                                 has_playback = 1;
2862                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2863                             snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2864                                 has_capture = 1;
2865                 }
2866         }
2867
2868         if (dai_link->playback_only)
2869                 has_capture = 0;
2870
2871         if (dai_link->capture_only)
2872                 has_playback = 0;
2873
2874         if (!has_playback && !has_capture) {
2875                 dev_err(rtd->dev, "substream %s has no playback, no capture\n",
2876                         dai_link->stream_name);
2877
2878                 return -EINVAL;
2879         }
2880
2881         *playback = has_playback;
2882         *capture  = has_capture;
2883
2884         return 0;
2885 }
2886
2887 static int soc_create_pcm(struct snd_pcm **pcm,
2888                           struct snd_soc_pcm_runtime *rtd,
2889                           int playback, int capture, int num)
2890 {
2891         char new_name[64];
2892         int ret;
2893
2894         /* create the PCM */
2895         if (rtd->dai_link->c2c_params) {
2896                 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2897                          rtd->dai_link->stream_name);
2898
2899                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2900                                            playback, capture, pcm);
2901         } else if (rtd->dai_link->no_pcm) {
2902                 snprintf(new_name, sizeof(new_name), "(%s)",
2903                         rtd->dai_link->stream_name);
2904
2905                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2906                                 playback, capture, pcm);
2907         } else {
2908                 if (rtd->dai_link->dynamic)
2909                         snprintf(new_name, sizeof(new_name), "%s (*)",
2910                                 rtd->dai_link->stream_name);
2911                 else
2912                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2913                                 rtd->dai_link->stream_name,
2914                                 soc_codec_dai_name(rtd), num);
2915
2916                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2917                         capture, pcm);
2918         }
2919         if (ret < 0) {
2920                 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2921                         new_name, rtd->dai_link->name, ret);
2922                 return ret;
2923         }
2924         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2925
2926         return 0;
2927 }
2928
2929 /* create a new pcm */
2930 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2931 {
2932         struct snd_soc_component *component;
2933         struct snd_pcm *pcm;
2934         int ret = 0, playback = 0, capture = 0;
2935         int i;
2936
2937         ret = soc_get_playback_capture(rtd, &playback, &capture);
2938         if (ret < 0)
2939                 return ret;
2940
2941         ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
2942         if (ret < 0)
2943                 return ret;
2944
2945         /* DAPM dai link stream work */
2946         /*
2947          * Currently nothing to do for c2c links
2948          * Since c2c links are internal nodes in the DAPM graph and
2949          * don't interface with the outside world or application layer
2950          * we don't have to do any special handling on close.
2951          */
2952         if (!rtd->dai_link->c2c_params)
2953                 rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2954
2955         rtd->pcm = pcm;
2956         pcm->nonatomic = rtd->dai_link->nonatomic;
2957         pcm->private_data = rtd;
2958         pcm->no_device_suspend = true;
2959
2960         if (rtd->dai_link->no_pcm || rtd->dai_link->c2c_params) {
2961                 if (playback)
2962                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2963                 if (capture)
2964                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2965                 goto out;
2966         }
2967
2968         /* ASoC PCM operations */
2969         if (rtd->dai_link->dynamic) {
2970                 rtd->ops.open           = dpcm_fe_dai_open;
2971                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2972                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2973                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2974                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2975                 rtd->ops.close          = dpcm_fe_dai_close;
2976                 rtd->ops.pointer        = soc_pcm_pointer;
2977         } else {
2978                 rtd->ops.open           = soc_pcm_open;
2979                 rtd->ops.hw_params      = soc_pcm_hw_params;
2980                 rtd->ops.prepare        = soc_pcm_prepare;
2981                 rtd->ops.trigger        = soc_pcm_trigger;
2982                 rtd->ops.hw_free        = soc_pcm_hw_free;
2983                 rtd->ops.close          = soc_pcm_close;
2984                 rtd->ops.pointer        = soc_pcm_pointer;
2985         }
2986
2987         for_each_rtd_components(rtd, i, component) {
2988                 const struct snd_soc_component_driver *drv = component->driver;
2989
2990                 if (drv->ioctl)
2991                         rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2992                 if (drv->sync_stop)
2993                         rtd->ops.sync_stop      = snd_soc_pcm_component_sync_stop;
2994                 if (drv->copy)
2995                         rtd->ops.copy           = snd_soc_pcm_component_copy;
2996                 if (drv->page)
2997                         rtd->ops.page           = snd_soc_pcm_component_page;
2998                 if (drv->mmap)
2999                         rtd->ops.mmap           = snd_soc_pcm_component_mmap;
3000                 if (drv->ack)
3001                         rtd->ops.ack            = snd_soc_pcm_component_ack;
3002         }
3003
3004         if (playback)
3005                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
3006
3007         if (capture)
3008                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
3009
3010         ret = snd_soc_pcm_component_new(rtd);
3011         if (ret < 0)
3012                 return ret;
3013 out:
3014         dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
3015                 soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
3016         return ret;
3017 }
3018
3019 /* is the current PCM operation for this FE ? */
3020 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
3021 {
3022         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
3023                 return 1;
3024         return 0;
3025 }
3026 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
3027
3028 /* is the current PCM operation for this BE ? */
3029 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
3030                 struct snd_soc_pcm_runtime *be, int stream)
3031 {
3032         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
3033            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
3034                   be->dpcm[stream].runtime_update))
3035                 return 1;
3036         return 0;
3037 }
3038 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
3039
3040 /* get the substream for this BE */
3041 struct snd_pcm_substream *
3042         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
3043 {
3044         return be->pcm->streams[stream].substream;
3045 }
3046 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
3047
3048 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
3049                                     struct snd_soc_pcm_runtime *be,
3050                                     int stream,
3051                                     const enum snd_soc_dpcm_state *states,
3052                                     int num_states)
3053 {
3054         struct snd_soc_dpcm *dpcm;
3055         int state;
3056         int ret = 1;
3057         int i;
3058
3059         for_each_dpcm_fe(be, stream, dpcm) {
3060
3061                 if (dpcm->fe == fe)
3062                         continue;
3063
3064                 state = dpcm->fe->dpcm[stream].state;
3065                 for (i = 0; i < num_states; i++) {
3066                         if (state == states[i]) {
3067                                 ret = 0;
3068                                 break;
3069                         }
3070                 }
3071         }
3072
3073         /* it's safe to do this BE DAI */
3074         return ret;
3075 }
3076
3077 /*
3078  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3079  * are not running, paused or suspended for the specified stream direction.
3080  */
3081 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3082                 struct snd_soc_pcm_runtime *be, int stream)
3083 {
3084         const enum snd_soc_dpcm_state state[] = {
3085                 SND_SOC_DPCM_STATE_START,
3086                 SND_SOC_DPCM_STATE_PAUSED,
3087                 SND_SOC_DPCM_STATE_SUSPEND,
3088         };
3089
3090         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3091 }
3092 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3093
3094 /*
3095  * We can only change hw params a BE DAI if any of it's FE are not prepared,
3096  * running, paused or suspended for the specified stream direction.
3097  */
3098 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3099                 struct snd_soc_pcm_runtime *be, int stream)
3100 {
3101         const enum snd_soc_dpcm_state state[] = {
3102                 SND_SOC_DPCM_STATE_START,
3103                 SND_SOC_DPCM_STATE_PAUSED,
3104                 SND_SOC_DPCM_STATE_SUSPEND,
3105                 SND_SOC_DPCM_STATE_PREPARE,
3106         };
3107
3108         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3109 }
3110 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
3111
3112 /*
3113  * We can only prepare a BE DAI if any of it's FE are not prepared,
3114  * running or paused for the specified stream direction.
3115  */
3116 int snd_soc_dpcm_can_be_prepared(struct snd_soc_pcm_runtime *fe,
3117                                  struct snd_soc_pcm_runtime *be, int stream)
3118 {
3119         const enum snd_soc_dpcm_state state[] = {
3120                 SND_SOC_DPCM_STATE_START,
3121                 SND_SOC_DPCM_STATE_PAUSED,
3122                 SND_SOC_DPCM_STATE_PREPARE,
3123         };
3124
3125         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3126 }
3127 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_prepared);