sound/soc/soc-pcm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // soc-pcm.c  --  ALSA SoC PCM
   4 //
   5 // Copyright 2005 Wolfson Microelectronics PLC.
   6 // Copyright 2005 Openedhand Ltd.
   7 // Copyright (C) 2010 Slimlogic Ltd.
   8 // Copyright (C) 2010 Texas Instruments Inc.
   9 //
  10 // Authors: Liam Girdwood <lrg@ti.com>
  11 //          Mark Brown <broonie@opensource.wolfsonmicro.com>
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/delay.h>
  16 #include <linux/pinctrl/consumer.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/slab.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/export.h>
  21 #include <linux/debugfs.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/soc-dpcm.h>
  27 #include <sound/soc-link.h>
  28 #include <sound/initval.h>
  29
  30 #define soc_pcm_ret(rtd, ret) _soc_pcm_ret(rtd, __func__, ret)
  31 static inline int _soc_pcm_ret(struct snd_soc_pcm_runtime *rtd,
  32                                const char *func, int ret)
  33 {
  34         /* Positive, Zero values are not errors */
  35         if (ret >= 0)
  36                 return ret;
  37
  38         /* Negative values might be errors */
  39         switch (ret) {
  40         case -EPROBE_DEFER:
  41         case -ENOTSUPP:
  42                 break;
  43         default:
  44                 dev_err(rtd->dev,
  45                         "ASoC: error at %s on %s: %d\n",
  46                         func, rtd->dai_link->name, ret);
  47         }
  48
  49         return ret;
  50 }
  51
  52 static inline void snd_soc_dpcm_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 ? asoc_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 ? asoc_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(asoc_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_dai *dai;
 296         int i;
 297
 298         snd_soc_dpcm_mutex_assert_held(rtd);
 299
 300         for_each_rtd_dais(rtd, i, dai)
 301                 snd_soc_dai_action(dai, stream, action);
 302 }
 303 EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
 304
 305 /**
 306  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 307  * @rtd: The ASoC PCM runtime that should be checked.
 308  *
 309  * This function checks whether the power down delay should be ignored for a
 310  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 311  * been configured to ignore the delay, or if none of the components benefits
 312  * from having the delay.
 313  */
 314 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 315 {
 316         struct snd_soc_component *component;
 317         bool ignore = true;
 318         int i;
 319
 320         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 321                 return true;
 322
 323         for_each_rtd_components(rtd, i, component)
 324                 ignore &= !component->driver->use_pmdown_time;
 325
 326         return ignore;
 327 }
 328
 329 /**
 330  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 331  * @substream: the pcm substream
 332  * @hw: the hardware parameters
 333  *
 334  * Sets the substream runtime hardware parameters.
 335  */
 336 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 337         const struct snd_pcm_hardware *hw)
 338 {
 339         substream->runtime->hw = *hw;
 340
 341         return 0;
 342 }
 343 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 344
 345 /* DPCM stream event, send event to FE and all active BEs. */
 346 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 347         int event)
 348 {
 349         struct snd_soc_dpcm *dpcm;
 350
 351         snd_soc_dpcm_mutex_assert_held(fe);
 352
 353         for_each_dpcm_be(fe, dir, dpcm) {
 354
 355                 struct snd_soc_pcm_runtime *be = dpcm->be;
 356
 357                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 358                                 be->dai_link->name, event, dir);
 359
 360                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
 361                     (be->dpcm[dir].users >= 1))
 362                         continue;
 363
 364                 snd_soc_dapm_stream_event(be, dir, event);
 365         }
 366
 367         snd_soc_dapm_stream_event(fe, dir, event);
 368
 369         return 0;
 370 }
 371
 372 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
 373                                    struct snd_pcm_hw_params *params)
 374 {
 375         if (params) {
 376                 dai->rate        = params_rate(params);
 377                 dai->channels    = params_channels(params);
 378                 dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
 379         } else {
 380                 dai->rate        = 0;
 381                 dai->channels    = 0;
 382                 dai->sample_bits = 0;
 383         }
 384 }
 385
 386 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 387                                         struct snd_soc_dai *soc_dai)
 388 {
 389         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 390         int ret;
 391
 392         if (!snd_soc_dai_active(soc_dai))
 393                 return 0;
 394
 395 #define __soc_pcm_apply_symmetry(name, NAME)                            \
 396         if (soc_dai->name && (soc_dai->driver->symmetric_##name ||      \
 397                               rtd->dai_link->symmetric_##name)) {       \
 398                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
 399                         #name, soc_dai->name);                          \
 400                                                                         \
 401                 ret = snd_pcm_hw_constraint_single(substream->runtime,  \
 402                                                    SNDRV_PCM_HW_PARAM_##NAME,\
 403                                                    soc_dai->name);      \
 404                 if (ret < 0) {                                          \
 405                         dev_err(soc_dai->dev,                           \
 406                                 "ASoC: Unable to apply %s constraint: %d\n",\
 407                                 #name, ret);                            \
 408                         return ret;                                     \
 409                 }                                                       \
 410         }
 411
 412         __soc_pcm_apply_symmetry(rate,          RATE);
 413         __soc_pcm_apply_symmetry(channels,      CHANNELS);
 414         __soc_pcm_apply_symmetry(sample_bits,   SAMPLE_BITS);
 415
 416         return 0;
 417 }
 418
 419 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 420                                 struct snd_pcm_hw_params *params)
 421 {
 422         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 423         struct snd_soc_dai d;
 424         struct snd_soc_dai *dai;
 425         struct snd_soc_dai *cpu_dai;
 426         unsigned int symmetry, i;
 427
 428         d.name = __func__;
 429         soc_pcm_set_dai_params(&d, params);
 430
 431 #define __soc_pcm_params_symmetry(xxx)                                  \
 432         symmetry = rtd->dai_link->symmetric_##xxx;                      \
 433         for_each_rtd_dais(rtd, i, dai)                                  \
 434                 symmetry |= dai->driver->symmetric_##xxx;               \
 435                                                                         \
 436         if (symmetry)                                                   \
 437                 for_each_rtd_cpu_dais(rtd, i, cpu_dai)                  \
 438                         if (!snd_soc_dai_is_dummy(cpu_dai) &&           \
 439                             cpu_dai->xxx && cpu_dai->xxx != d.xxx) {    \
 440                                 dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
 441                                         #xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
 442                                 return -EINVAL;                         \
 443                         }
 444
 445         /* reject unmatched parameters when applying symmetry */
 446         __soc_pcm_params_symmetry(rate);
 447         __soc_pcm_params_symmetry(channels);
 448         __soc_pcm_params_symmetry(sample_bits);
 449
 450         return 0;
 451 }
 452
 453 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
 454 {
 455         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 456         struct snd_soc_dai_link *link = rtd->dai_link;
 457         struct snd_soc_dai *dai;
 458         unsigned int symmetry, i;
 459
 460         symmetry = link->symmetric_rate ||
 461                 link->symmetric_channels ||
 462                 link->symmetric_sample_bits;
 463
 464         for_each_rtd_dais(rtd, i, dai)
 465                 symmetry = symmetry ||
 466                         dai->driver->symmetric_rate ||
 467                         dai->driver->symmetric_channels ||
 468                         dai->driver->symmetric_sample_bits;
 469
 470         if (symmetry)
 471                 substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 472 }
 473
 474 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 475 {
 476         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 477         int ret;
 478
 479         if (!bits)
 480                 return;
 481
 482         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 483         if (ret != 0)
 484                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 485                                  bits, ret);
 486 }
 487
 488 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 489 {
 490         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 491         struct snd_soc_dai *cpu_dai;
 492         struct snd_soc_dai *codec_dai;
 493         int stream = substream->stream;
 494         int i;
 495         unsigned int bits = 0, cpu_bits = 0;
 496
 497         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 498                 struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 499
 500                 if (pcm_codec->sig_bits == 0) {
 501                         bits = 0;
 502                         break;
 503                 }
 504                 bits = max(pcm_codec->sig_bits, bits);
 505         }
 506
 507         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 508                 struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 509
 510                 if (pcm_cpu->sig_bits == 0) {
 511                         cpu_bits = 0;
 512                         break;
 513                 }
 514                 cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
 515         }
 516
 517         soc_pcm_set_msb(substream, bits);
 518         soc_pcm_set_msb(substream, cpu_bits);
 519 }
 520
 521 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
 522 {
 523         hw->rates               = UINT_MAX;
 524         hw->rate_min            = 0;
 525         hw->rate_max            = UINT_MAX;
 526         hw->channels_min        = 0;
 527         hw->channels_max        = UINT_MAX;
 528         hw->formats             = ULLONG_MAX;
 529 }
 530
 531 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
 532                                    struct snd_soc_pcm_stream *p)
 533 {
 534         hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
 535
 536         /* setup hw->rate_min/max via hw->rates first */
 537         snd_pcm_hw_limit_rates(hw);
 538
 539         /* update hw->rate_min/max by snd_soc_pcm_stream */
 540         hw->rate_min = max(hw->rate_min, p->rate_min);
 541         hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
 542 }
 543
 544 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
 545                                    struct snd_soc_pcm_stream *p)
 546 {
 547         hw->channels_min = max(hw->channels_min, p->channels_min);
 548         hw->channels_max = min(hw->channels_max, p->channels_max);
 549 }
 550
 551 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
 552                                      struct snd_soc_pcm_stream *p)
 553 {
 554         hw->formats &= p->formats;
 555 }
 556
 557 /**
 558  * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
 559  * @rtd: ASoC PCM runtime
 560  * @hw: PCM hardware parameters (output)
 561  * @stream: Direction of the PCM stream
 562  *
 563  * Calculates the subset of stream parameters supported by all DAIs
 564  * associated with the PCM stream.
 565  */
 566 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
 567                             struct snd_pcm_hardware *hw, int stream)
 568 {
 569         struct snd_soc_dai *codec_dai;
 570         struct snd_soc_dai *cpu_dai;
 571         struct snd_soc_pcm_stream *codec_stream;
 572         struct snd_soc_pcm_stream *cpu_stream;
 573         unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
 574         int i;
 575
 576         soc_pcm_hw_init(hw);
 577
 578         /* first calculate min/max only for CPUs in the DAI link */
 579         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 580
 581                 /*
 582                  * Skip CPUs which don't support the current stream type.
 583                  * Otherwise, since the rate, channel, and format values will
 584                  * zero in that case, we would have no usable settings left,
 585                  * causing the resulting setup to fail.
 586                  */
 587                 if (!snd_soc_dai_stream_valid(cpu_dai, stream))
 588                         continue;
 589
 590                 cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 591
 592                 soc_pcm_hw_update_chan(hw, cpu_stream);
 593                 soc_pcm_hw_update_rate(hw, cpu_stream);
 594                 soc_pcm_hw_update_format(hw, cpu_stream);
 595         }
 596         cpu_chan_min = hw->channels_min;
 597         cpu_chan_max = hw->channels_max;
 598
 599         /* second calculate min/max only for CODECs in the DAI link */
 600         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 601
 602                 /*
 603                  * Skip CODECs which don't support the current stream type.
 604                  * Otherwise, since the rate, channel, and format values will
 605                  * zero in that case, we would have no usable settings left,
 606                  * causing the resulting setup to fail.
 607                  */
 608                 if (!snd_soc_dai_stream_valid(codec_dai, stream))
 609                         continue;
 610
 611                 codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 612
 613                 soc_pcm_hw_update_chan(hw, codec_stream);
 614                 soc_pcm_hw_update_rate(hw, codec_stream);
 615                 soc_pcm_hw_update_format(hw, codec_stream);
 616         }
 617
 618         /* Verify both a valid CPU DAI and a valid CODEC DAI were found */
 619         if (!hw->channels_min)
 620                 return -EINVAL;
 621
 622         /*
 623          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 624          * connected to CPU DAI(s), use CPU DAI's directly and let
 625          * channel allocation be fixed up later
 626          */
 627         if (rtd->dai_link->num_codecs > 1) {
 628                 hw->channels_min = cpu_chan_min;
 629                 hw->channels_max = cpu_chan_max;
 630         }
 631
 632         return 0;
 633 }
 634 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
 635
 636 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 637 {
 638         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 639         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 640         u64 formats = hw->formats;
 641
 642         /*
 643          * At least one CPU and one CODEC should match. Otherwise, we should
 644          * have bailed out on a higher level, since there would be no CPU or
 645          * CODEC to support the transfer direction in that case.
 646          */
 647         snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
 648
 649         if (formats)
 650                 hw->formats &= formats;
 651 }
 652
 653 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
 654 {
 655         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 656         struct snd_soc_component *component;
 657         int i, ret = 0;
 658
 659         for_each_rtd_components(rtd, i, component) {
 660                 ret = snd_soc_component_module_get_when_open(component, substream);
 661                 if (ret < 0)
 662                         break;
 663
 664                 ret = snd_soc_component_open(component, substream);
 665                 if (ret < 0)
 666                         break;
 667         }
 668
 669         return ret;
 670 }
 671
 672 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
 673                                     int rollback)
 674 {
 675         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 676         struct snd_soc_component *component;
 677         int i, ret = 0;
 678
 679         for_each_rtd_components(rtd, i, component) {
 680                 int r = snd_soc_component_close(component, substream, rollback);
 681                 if (r < 0)
 682                         ret = r; /* use last ret */
 683
 684                 snd_soc_component_module_put_when_close(component, substream, rollback);
 685         }
 686
 687         return ret;
 688 }
 689
 690 static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
 691                          struct snd_pcm_substream *substream, int rollback)
 692 {
 693         struct snd_soc_component *component;
 694         struct snd_soc_dai *dai;
 695         int i;
 696
 697         snd_soc_dpcm_mutex_assert_held(rtd);
 698
 699         if (!rollback) {
 700                 snd_soc_runtime_deactivate(rtd, substream->stream);
 701                 /* clear the corresponding DAIs parameters when going to be inactive */
 702                 for_each_rtd_dais(rtd, i, dai) {
 703                         if (snd_soc_dai_active(dai) == 0)
 704                                 soc_pcm_set_dai_params(dai, NULL);
 705
 706                         if (snd_soc_dai_stream_active(dai, substream->stream) == 0)
 707                                 snd_soc_dai_digital_mute(dai, 1, substream->stream);
 708                 }
 709         }
 710
 711         for_each_rtd_dais(rtd, i, dai)
 712                 snd_soc_dai_shutdown(dai, substream, rollback);
 713
 714         snd_soc_link_shutdown(substream, rollback);
 715
 716         soc_pcm_components_close(substream, rollback);
 717
 718         snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
 719
 720         for_each_rtd_components(rtd, i, component)
 721                 if (!snd_soc_component_active(component))
 722                         pinctrl_pm_select_sleep_state(component->dev);
 723
 724         return 0;
 725 }
 726
 727 /*
 728  * Called by ALSA when a PCM substream is closed. Private data can be
 729  * freed here. The cpu DAI, codec DAI, machine and components are also
 730  * shutdown.
 731  */
 732 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
 733                            struct snd_pcm_substream *substream)
 734 {
 735         return soc_pcm_clean(rtd, substream, 0);
 736 }
 737
 738 /* PCM close ops for non-DPCM streams */
 739 static int soc_pcm_close(struct snd_pcm_substream *substream)
 740 {
 741         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 742
 743         snd_soc_dpcm_mutex_lock(rtd);
 744         __soc_pcm_close(rtd, substream);
 745         snd_soc_dpcm_mutex_unlock(rtd);
 746         return 0;
 747 }
 748
 749 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
 750 {
 751         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 752         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 753         const char *name_cpu = soc_cpu_dai_name(rtd);
 754         const char *name_codec = soc_codec_dai_name(rtd);
 755         const char *err_msg;
 756         struct device *dev = rtd->dev;
 757
 758         err_msg = "rates";
 759         if (!hw->rates)
 760                 goto config_err;
 761
 762         err_msg = "formats";
 763         if (!hw->formats)
 764                 goto config_err;
 765
 766         err_msg = "channels";
 767         if (!hw->channels_min || !hw->channels_max ||
 768              hw->channels_min  >  hw->channels_max)
 769                 goto config_err;
 770
 771         dev_dbg(dev, "ASoC: %s <-> %s info:\n",         name_codec,
 772                                                         name_cpu);
 773         dev_dbg(dev, "ASoC: rate mask 0x%x\n",          hw->rates);
 774         dev_dbg(dev, "ASoC: ch   min %d max %d\n",      hw->channels_min,
 775                                                         hw->channels_max);
 776         dev_dbg(dev, "ASoC: rate min %d max %d\n",      hw->rate_min,
 777                                                         hw->rate_max);
 778
 779         return 0;
 780
 781 config_err:
 782         dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
 783                 name_codec, name_cpu, err_msg);
 784         return -EINVAL;
 785 }
 786
 787 /*
 788  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 789  * then initialized and any private data can be allocated. This also calls
 790  * startup for the cpu DAI, component, machine and codec DAI.
 791  */
 792 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
 793                           struct snd_pcm_substream *substream)
 794 {
 795         struct snd_soc_component *component;
 796         struct snd_soc_dai *dai;
 797         int i, ret = 0;
 798
 799         snd_soc_dpcm_mutex_assert_held(rtd);
 800
 801         for_each_rtd_components(rtd, i, component)
 802                 pinctrl_pm_select_default_state(component->dev);
 803
 804         ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
 805         if (ret < 0)
 806                 goto err;
 807
 808         ret = soc_pcm_components_open(substream);
 809         if (ret < 0)
 810                 goto err;
 811
 812         ret = snd_soc_link_startup(substream);
 813         if (ret < 0)
 814                 goto err;
 815
 816         /* startup the audio subsystem */
 817         for_each_rtd_dais(rtd, i, dai) {
 818                 ret = snd_soc_dai_startup(dai, substream);
 819                 if (ret < 0)
 820                         goto err;
 821         }
 822
 823         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 824         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 825                 goto dynamic;
 826
 827         /* Check that the codec and cpu DAIs are compatible */
 828         soc_pcm_init_runtime_hw(substream);
 829
 830         soc_pcm_update_symmetry(substream);
 831
 832         ret = soc_hw_sanity_check(substream);
 833         if (ret < 0)
 834                 goto err;
 835
 836         soc_pcm_apply_msb(substream);
 837
 838         /* Symmetry only applies if we've already got an active stream. */
 839         for_each_rtd_dais(rtd, i, dai) {
 840                 ret = soc_pcm_apply_symmetry(substream, dai);
 841                 if (ret != 0)
 842                         goto err;
 843         }
 844 dynamic:
 845         snd_soc_runtime_activate(rtd, substream->stream);
 846         ret = 0;
 847 err:
 848         if (ret < 0)
 849                 soc_pcm_clean(rtd, substream, 1);
 850
 851         return soc_pcm_ret(rtd, ret);
 852 }
 853
 854 /* PCM open ops for non-DPCM streams */
 855 static int soc_pcm_open(struct snd_pcm_substream *substream)
 856 {
 857         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 858         int ret;
 859
 860         snd_soc_dpcm_mutex_lock(rtd);
 861         ret = __soc_pcm_open(rtd, substream);
 862         snd_soc_dpcm_mutex_unlock(rtd);
 863         return ret;
 864 }
 865
 866 /*
 867  * Called by ALSA when the PCM substream is prepared, can set format, sample
 868  * rate, etc.  This function is non atomic and can be called multiple times,
 869  * it can refer to the runtime info.
 870  */
 871 static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
 872                              struct snd_pcm_substream *substream)
 873 {
 874         struct snd_soc_dai *dai;
 875         int i, ret = 0;
 876
 877         snd_soc_dpcm_mutex_assert_held(rtd);
 878
 879         ret = snd_soc_link_prepare(substream);
 880         if (ret < 0)
 881                 goto out;
 882
 883         ret = snd_soc_pcm_component_prepare(substream);
 884         if (ret < 0)
 885                 goto out;
 886
 887         ret = snd_soc_pcm_dai_prepare(substream);
 888         if (ret < 0)
 889                 goto out;
 890
 891         /* cancel any delayed stream shutdown that is pending */
 892         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 893             rtd->pop_wait) {
 894                 rtd->pop_wait = 0;
 895                 cancel_delayed_work(&rtd->delayed_work);
 896         }
 897
 898         snd_soc_dapm_stream_event(rtd, substream->stream,
 899                         SND_SOC_DAPM_STREAM_START);
 900
 901         for_each_rtd_dais(rtd, i, dai)
 902                 snd_soc_dai_digital_mute(dai, 0, substream->stream);
 903
 904 out:
 905         return soc_pcm_ret(rtd, ret);
 906 }
 907
 908 /* PCM prepare ops for non-DPCM streams */
 909 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 910 {
 911         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 912         int ret;
 913
 914         snd_soc_dpcm_mutex_lock(rtd);
 915         ret = __soc_pcm_prepare(rtd, substream);
 916         snd_soc_dpcm_mutex_unlock(rtd);
 917         return ret;
 918 }
 919
 920 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 921                                        unsigned int mask)
 922 {
 923         struct snd_interval *interval;
 924         int channels = hweight_long(mask);
 925
 926         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 927         interval->min = channels;
 928         interval->max = channels;
 929 }
 930
 931 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
 932                             struct snd_pcm_substream *substream, int rollback)
 933 {
 934         struct snd_soc_dai *dai;
 935         int i;
 936
 937         snd_soc_dpcm_mutex_assert_held(rtd);
 938
 939         /* run the stream event */
 940         snd_soc_dapm_stream_stop(rtd, substream->stream);
 941
 942         /* free any machine hw params */
 943         snd_soc_link_hw_free(substream, rollback);
 944
 945         /* free any component resources */
 946         snd_soc_pcm_component_hw_free(substream, rollback);
 947
 948         /* now free hw params for the DAIs  */
 949         for_each_rtd_dais(rtd, i, dai)
 950                 if (snd_soc_dai_stream_valid(dai, substream->stream))
 951                         snd_soc_dai_hw_free(dai, substream, rollback);
 952
 953         return 0;
 954 }
 955
 956 /*
 957  * Frees resources allocated by hw_params, can be called multiple times
 958  */
 959 static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
 960                              struct snd_pcm_substream *substream)
 961 {
 962         return soc_pcm_hw_clean(rtd, substream, 0);
 963 }
 964
 965 /* hw_free PCM ops for non-DPCM streams */
 966 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 967 {
 968         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 969         int ret;
 970
 971         snd_soc_dpcm_mutex_lock(rtd);
 972         ret = __soc_pcm_hw_free(rtd, substream);
 973         snd_soc_dpcm_mutex_unlock(rtd);
 974         return ret;
 975 }
 976
 977 /*
 978  * Called by ALSA when the hardware params are set by application. This
 979  * function can also be called multiple times and can allocate buffers
 980  * (using snd_pcm_lib_* ). It's non-atomic.
 981  */
 982 static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
 983                                struct snd_pcm_substream *substream,
 984                                struct snd_pcm_hw_params *params)
 985 {
 986         struct snd_soc_dai *cpu_dai;
 987         struct snd_soc_dai *codec_dai;
 988         int i, ret = 0;
 989
 990         snd_soc_dpcm_mutex_assert_held(rtd);
 991
 992         ret = soc_pcm_params_symmetry(substream, params);
 993         if (ret)
 994                 goto out;
 995
 996         ret = snd_soc_link_hw_params(substream, params);
 997         if (ret < 0)
 998                 goto out;
 999
1000         for_each_rtd_codec_dais(rtd, i, codec_dai) {
1001                 struct snd_pcm_hw_params codec_params;
1002                 unsigned int tdm_mask = snd_soc_dai_tdm_mask_get(codec_dai, substream->stream);
1003
1004                 /*
1005                  * Skip CODECs which don't support the current stream type,
1006                  * the idea being that if a CODEC is not used for the currently
1007                  * set up transfer direction, it should not need to be
1008                  * configured, especially since the configuration used might
1009                  * not even be supported by that CODEC. There may be cases
1010                  * however where a CODEC needs to be set up although it is
1011                  * actually not being used for the transfer, e.g. if a
1012                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
1013                  * for the DAI link including a playback-only CODEC.
1014                  * If this becomes necessary, we will have to augment the
1015                  * machine driver setup with information on how to act, so
1016                  * we can do the right thing here.
1017                  */
1018                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1019                         continue;
1020
1021                 /* copy params for each codec */
1022                 codec_params = *params;
1023
1024                 /* fixup params based on TDM slot masks */
1025                 if (tdm_mask)
1026                         soc_pcm_codec_params_fixup(&codec_params, tdm_mask);
1027
1028                 ret = snd_soc_dai_hw_params(codec_dai, substream,
1029                                             &codec_params);
1030                 if(ret < 0)
1031                         goto out;
1032
1033                 soc_pcm_set_dai_params(codec_dai, &codec_params);
1034                 snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
1035         }
1036
1037         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1038                 /*
1039                  * Skip CPUs which don't support the current stream
1040                  * type. See soc_pcm_init_runtime_hw() for more details
1041                  */
1042                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1043                         continue;
1044
1045                 ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
1046                 if (ret < 0)
1047                         goto out;
1048
1049                 /* store the parameters for each DAI */
1050                 soc_pcm_set_dai_params(cpu_dai, params);
1051                 snd_soc_dapm_update_dai(substream, params, cpu_dai);
1052         }
1053
1054         ret = snd_soc_pcm_component_hw_params(substream, params);
1055 out:
1056         if (ret < 0)
1057                 soc_pcm_hw_clean(rtd, substream, 1);
1058
1059         return soc_pcm_ret(rtd, ret);
1060 }
1061
1062 /* hw_params PCM ops for non-DPCM streams */
1063 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
1064                              struct snd_pcm_hw_params *params)
1065 {
1066         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1067         int ret;
1068
1069         snd_soc_dpcm_mutex_lock(rtd);
1070         ret = __soc_pcm_hw_params(rtd, substream, params);
1071         snd_soc_dpcm_mutex_unlock(rtd);
1072         return ret;
1073 }
1074
1075 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1076 {
1077         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1078         struct snd_soc_component *component;
1079         int ret = -EINVAL, _ret = 0, start_dma_last = 0, i;
1080         int rollback = 0;
1081
1082         switch (cmd) {
1083         case SNDRV_PCM_TRIGGER_START:
1084         case SNDRV_PCM_TRIGGER_RESUME:
1085         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1086                 /* Do we need to start dma last? */
1087                 for_each_rtd_components(rtd, i, component) {
1088                         if (component->driver->start_dma_last) {
1089                                 start_dma_last = 1;
1090                                 break;
1091                         }
1092                 }
1093
1094                 ret = snd_soc_link_trigger(substream, cmd, 0);
1095                 if (ret < 0)
1096                         goto start_err;
1097
1098                 if (start_dma_last) {
1099                         ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
1100                         if (ret < 0)
1101                                 goto start_err;
1102
1103                         ret = snd_soc_pcm_component_trigger(substream, cmd, 0);
1104                 } else {
1105                         ret = snd_soc_pcm_component_trigger(substream, cmd, 0);
1106                         if (ret < 0)
1107                                 goto start_err;
1108
1109                         ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
1110                 }
1111 start_err:
1112                 if (ret < 0)
1113                         rollback = 1;
1114         }
1115
1116         if (rollback) {
1117                 _ret = ret;
1118                 switch (cmd) {
1119                 case SNDRV_PCM_TRIGGER_START:
1120                         cmd = SNDRV_PCM_TRIGGER_STOP;
1121                         break;
1122                 case SNDRV_PCM_TRIGGER_RESUME:
1123                         cmd = SNDRV_PCM_TRIGGER_SUSPEND;
1124                         break;
1125                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1126                         cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
1127                         break;
1128                 }
1129         }
1130
1131         switch (cmd) {
1132         case SNDRV_PCM_TRIGGER_STOP:
1133         case SNDRV_PCM_TRIGGER_SUSPEND:
1134         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1135                 if (rtd->dai_link->stop_dma_first) {
1136                         ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
1137                         if (ret < 0)
1138                                 break;
1139
1140                         ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
1141                         if (ret < 0)
1142                                 break;
1143                 } else {
1144                         ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
1145                         if (ret < 0)
1146                                 break;
1147
1148                         ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
1149                         if (ret < 0)
1150                                 break;
1151                 }
1152                 ret = snd_soc_link_trigger(substream, cmd, rollback);
1153                 break;
1154         }
1155
1156         if (_ret)
1157                 ret = _ret;
1158
1159         return ret;
1160 }
1161
1162 /*
1163  * soc level wrapper for pointer callback
1164  * If cpu_dai, codec_dai, component driver has the delay callback, then
1165  * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
1166  */
1167 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1168 {
1169         struct snd_pcm_runtime *runtime = substream->runtime;
1170         snd_pcm_uframes_t offset = 0;
1171         snd_pcm_sframes_t codec_delay = 0;
1172         snd_pcm_sframes_t cpu_delay = 0;
1173
1174         offset = snd_soc_pcm_component_pointer(substream);
1175
1176         /* should be called *after* snd_soc_pcm_component_pointer() */
1177         snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
1178         snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
1179
1180         runtime->delay = cpu_delay + codec_delay;
1181
1182         return offset;
1183 }
1184
1185 /* connect a FE and BE */
1186 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1187                 struct snd_soc_pcm_runtime *be, int stream)
1188 {
1189         struct snd_pcm_substream *fe_substream;
1190         struct snd_pcm_substream *be_substream;
1191         struct snd_soc_dpcm *dpcm;
1192
1193         snd_soc_dpcm_mutex_assert_held(fe);
1194
1195         /* only add new dpcms */
1196         for_each_dpcm_be(fe, stream, dpcm) {
1197                 if (dpcm->be == be && dpcm->fe == fe)
1198                         return 0;
1199         }
1200
1201         fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1202         be_substream = snd_soc_dpcm_get_substream(be, stream);
1203
1204         if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
1205                 dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
1206                         __func__);
1207                 return -EINVAL;
1208         }
1209         if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
1210                 dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n");
1211                 be_substream->pcm->nonatomic = 1;
1212         }
1213
1214         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1215         if (!dpcm)
1216                 return -ENOMEM;
1217
1218         dpcm->be = be;
1219         dpcm->fe = fe;
1220         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1221         snd_soc_dpcm_stream_lock_irq(fe, stream);
1222         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1223         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1224         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1225
1226         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1227                         stream ? "capture" : "playback",  fe->dai_link->name,
1228                         stream ? "<-" : "->", be->dai_link->name);
1229
1230         dpcm_create_debugfs_state(dpcm, stream);
1231
1232         return 1;
1233 }
1234
1235 /* reparent a BE onto another FE */
1236 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1237                         struct snd_soc_pcm_runtime *be, int stream)
1238 {
1239         struct snd_soc_dpcm *dpcm;
1240         struct snd_pcm_substream *fe_substream, *be_substream;
1241
1242         /* reparent if BE is connected to other FEs */
1243         if (!be->dpcm[stream].users)
1244                 return;
1245
1246         be_substream = snd_soc_dpcm_get_substream(be, stream);
1247         if (!be_substream)
1248                 return;
1249
1250         for_each_dpcm_fe(be, stream, dpcm) {
1251                 if (dpcm->fe == fe)
1252                         continue;
1253
1254                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1255                         stream ? "capture" : "playback",
1256                         dpcm->fe->dai_link->name,
1257                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1258
1259                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1260                 be_substream->runtime = fe_substream->runtime;
1261                 break;
1262         }
1263 }
1264
1265 /* disconnect a BE and FE */
1266 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1267 {
1268         struct snd_soc_dpcm *dpcm, *d;
1269         LIST_HEAD(deleted_dpcms);
1270
1271         snd_soc_dpcm_mutex_assert_held(fe);
1272
1273         snd_soc_dpcm_stream_lock_irq(fe, stream);
1274         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1275                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1276                                 stream ? "capture" : "playback",
1277                                 dpcm->be->dai_link->name);
1278
1279                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1280                         continue;
1281
1282                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1283                         stream ? "capture" : "playback", fe->dai_link->name,
1284                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1285
1286                 /* BEs still alive need new FE */
1287                 dpcm_be_reparent(fe, dpcm->be, stream);
1288
1289                 list_del(&dpcm->list_be);
1290                 list_move(&dpcm->list_fe, &deleted_dpcms);
1291         }
1292         snd_soc_dpcm_stream_unlock_irq(fe, stream);
1293
1294         while (!list_empty(&deleted_dpcms)) {
1295                 dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
1296                                         list_fe);
1297                 list_del(&dpcm->list_fe);
1298                 dpcm_remove_debugfs_state(dpcm);
1299                 kfree(dpcm);
1300         }
1301 }
1302
1303 /* get BE for DAI widget and stream */
1304 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1305                 struct snd_soc_dapm_widget *widget, int stream)
1306 {
1307         struct snd_soc_pcm_runtime *be;
1308         struct snd_soc_dapm_widget *w;
1309         struct snd_soc_dai *dai;
1310         int i;
1311
1312         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1313
1314         for_each_card_rtds(card, be) {
1315
1316                 if (!be->dai_link->no_pcm)
1317                         continue;
1318
1319                 if (!snd_soc_dpcm_get_substream(be, stream))
1320                         continue;
1321
1322                 for_each_rtd_dais(be, i, dai) {
1323                         w = snd_soc_dai_get_widget(dai, stream);
1324
1325                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1326                                 w ? w->name : "(not set)");
1327
1328                         if (w == widget)
1329                                 return be;
1330                 }
1331         }
1332
1333         /* Widget provided is not a BE */
1334         return NULL;
1335 }
1336
1337 int widget_in_list(struct snd_soc_dapm_widget_list *list,
1338                 struct snd_soc_dapm_widget *widget)
1339 {
1340         struct snd_soc_dapm_widget *w;
1341         int i;
1342
1343         for_each_dapm_widgets(list, i, w)
1344                 if (widget == w)
1345                         return 1;
1346
1347         return 0;
1348 }
1349 EXPORT_SYMBOL_GPL(widget_in_list);
1350
1351 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
1352 {
1353         struct snd_soc_card *card = widget->dapm->card;
1354         struct snd_soc_pcm_runtime *rtd;
1355         int stream;
1356
1357         /* adjust dir to stream */
1358         if (dir == SND_SOC_DAPM_DIR_OUT)
1359                 stream = SNDRV_PCM_STREAM_PLAYBACK;
1360         else
1361                 stream = SNDRV_PCM_STREAM_CAPTURE;
1362
1363         rtd = dpcm_get_be(card, widget, stream);
1364         if (rtd)
1365                 return true;
1366
1367         return false;
1368 }
1369 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
1370
1371 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1372         int stream, struct snd_soc_dapm_widget_list **list)
1373 {
1374         struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
1375         int paths;
1376
1377         if (fe->dai_link->num_cpus > 1) {
1378                 dev_err(fe->dev,
1379                         "%s doesn't support Multi CPU yet\n", __func__);
1380                 return -EINVAL;
1381         }
1382
1383         /* get number of valid DAI paths and their widgets */
1384         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1385                         fe->card->component_chaining ?
1386                                 NULL : dpcm_end_walk_at_be);
1387
1388         if (paths > 0)
1389                 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1390                         stream ? "capture" : "playback");
1391         else if (paths == 0)
1392                 dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
1393                          stream ? "capture" : "playback");
1394
1395         return paths;
1396 }
1397
1398 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1399 {
1400         snd_soc_dapm_dai_free_widgets(list);
1401 }
1402
1403 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1404                               struct snd_soc_dapm_widget_list *list)
1405 {
1406         struct snd_soc_dai *dai;
1407         unsigned int i;
1408
1409         /* is there a valid DAI widget for this BE */
1410         for_each_rtd_dais(dpcm->be, i, dai) {
1411                 struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
1412
1413                 /*
1414                  * The BE is pruned only if none of the dai
1415                  * widgets are in the active list.
1416                  */
1417                 if (widget && widget_in_list(list, widget))
1418                         return true;
1419         }
1420
1421         return false;
1422 }
1423
1424 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1425                             struct snd_soc_dapm_widget_list **list_)
1426 {
1427         struct snd_soc_dpcm *dpcm;
1428         int prune = 0;
1429
1430         /* Destroy any old FE <--> BE connections */
1431         for_each_dpcm_be(fe, stream, dpcm) {
1432                 if (dpcm_be_is_active(dpcm, stream, *list_))
1433                         continue;
1434
1435                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1436                         stream ? "capture" : "playback",
1437                         dpcm->be->dai_link->name, fe->dai_link->name);
1438                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1439                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
1440                 prune++;
1441         }
1442
1443         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1444         return prune;
1445 }
1446
1447 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1448         struct snd_soc_dapm_widget_list **list_)
1449 {
1450         struct snd_soc_card *card = fe->card;
1451         struct snd_soc_dapm_widget_list *list = *list_;
1452         struct snd_soc_pcm_runtime *be;
1453         struct snd_soc_dapm_widget *widget;
1454         struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1455         int i, new = 0, err;
1456
1457         /* don't connect if FE is not running */
1458         if (!fe_substream->runtime && !fe->fe_compr)
1459                 return new;
1460
1461         /* Create any new FE <--> BE connections */
1462         for_each_dapm_widgets(list, i, widget) {
1463
1464                 switch (widget->id) {
1465                 case snd_soc_dapm_dai_in:
1466                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1467                                 continue;
1468                         break;
1469                 case snd_soc_dapm_dai_out:
1470                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1471                                 continue;
1472                         break;
1473                 default:
1474                         continue;
1475                 }
1476
1477                 /* is there a valid BE rtd for this widget */
1478                 be = dpcm_get_be(card, widget, stream);
1479                 if (!be) {
1480                         dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
1481                                 widget->name);
1482                         continue;
1483                 }
1484
1485                 /*
1486                  * Filter for systems with 'component_chaining' enabled.
1487                  * This helps to avoid unnecessary re-configuration of an
1488                  * already active BE on such systems.
1489                  */
1490                 if (fe->card->component_chaining &&
1491                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1492                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1493                         continue;
1494
1495                 /* newly connected FE and BE */
1496                 err = dpcm_be_connect(fe, be, stream);
1497                 if (err < 0) {
1498                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1499                                 widget->name);
1500                         break;
1501                 } else if (err == 0) /* already connected */
1502                         continue;
1503
1504                 /* new */
1505                 dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
1506                 new++;
1507         }
1508
1509         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1510         return new;
1511 }
1512
1513 /*
1514  * Find the corresponding BE DAIs that source or sink audio to this
1515  * FE substream.
1516  */
1517 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1518         int stream, struct snd_soc_dapm_widget_list **list, int new)
1519 {
1520         if (new)
1521                 return dpcm_add_paths(fe, stream, list);
1522         else
1523                 return dpcm_prune_paths(fe, stream, list);
1524 }
1525
1526 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1527 {
1528         struct snd_soc_dpcm *dpcm;
1529
1530         for_each_dpcm_be(fe, stream, dpcm)
1531                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
1532 }
1533
1534 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
1535                       int do_hw_free, struct snd_soc_dpcm *last)
1536 {
1537         struct snd_soc_dpcm *dpcm;
1538
1539         /* disable any enabled and non active backends */
1540         for_each_dpcm_be(fe, stream, dpcm) {
1541                 struct snd_soc_pcm_runtime *be = dpcm->be;
1542                 struct snd_pcm_substream *be_substream =
1543                         snd_soc_dpcm_get_substream(be, stream);
1544
1545                 if (dpcm == last)
1546                         return;
1547
1548                 /* is this op for this BE ? */
1549                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1550                         continue;
1551
1552                 if (be->dpcm[stream].users == 0) {
1553                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1554                                 stream ? "capture" : "playback",
1555                                 be->dpcm[stream].state);
1556                         continue;
1557                 }
1558
1559                 if (--be->dpcm[stream].users != 0)
1560                         continue;
1561
1562                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
1563                         if (!do_hw_free)
1564                                 continue;
1565
1566                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
1567                                 __soc_pcm_hw_free(be, be_substream);
1568                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1569                         }
1570                 }
1571
1572                 __soc_pcm_close(be, be_substream);
1573                 be_substream->runtime = NULL;
1574                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1575         }
1576 }
1577
1578 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1579 {
1580         struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1581         struct snd_soc_pcm_runtime *be;
1582         struct snd_soc_dpcm *dpcm;
1583         int err, count = 0;
1584
1585         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1586         for_each_dpcm_be(fe, stream, dpcm) {
1587                 struct snd_pcm_substream *be_substream;
1588
1589                 be = dpcm->be;
1590                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1591
1592                 if (!be_substream) {
1593                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1594                                 stream ? "capture" : "playback");
1595                         continue;
1596                 }
1597
1598                 /* is this op for this BE ? */
1599                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1600                         continue;
1601
1602                 /* first time the dpcm is open ? */
1603                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
1604                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1605                                 stream ? "capture" : "playback",
1606                                 be->dpcm[stream].state);
1607                         continue;
1608                 }
1609
1610                 if (be->dpcm[stream].users++ != 0)
1611                         continue;
1612
1613                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1614                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1615                         continue;
1616
1617                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1618                         stream ? "capture" : "playback", be->dai_link->name);
1619
1620                 be_substream->runtime = fe_substream->runtime;
1621                 err = __soc_pcm_open(be, be_substream);
1622                 if (err < 0) {
1623                         be->dpcm[stream].users--;
1624                         if (be->dpcm[stream].users < 0)
1625                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1626                                         stream ? "capture" : "playback",
1627                                         be->dpcm[stream].state);
1628
1629                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1630                         goto unwind;
1631                 }
1632                 be->dpcm[stream].be_start = 0;
1633                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1634                 count++;
1635         }
1636
1637         return count;
1638
1639 unwind:
1640         dpcm_be_dai_startup_rollback(fe, stream, dpcm);
1641
1642         return soc_pcm_ret(fe, err);
1643 }
1644
1645 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
1646 {
1647         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1648         struct snd_pcm_runtime *runtime = substream->runtime;
1649         struct snd_pcm_hardware *hw = &runtime->hw;
1650         struct snd_soc_dai *dai;
1651         int stream = substream->stream;
1652         u64 formats = hw->formats;
1653         int i;
1654
1655         soc_pcm_hw_init(hw);
1656
1657         if (formats)
1658                 hw->formats &= formats;
1659
1660         for_each_rtd_cpu_dais(fe, i, dai) {
1661                 struct snd_soc_pcm_stream *cpu_stream;
1662
1663                 /*
1664                  * Skip CPUs which don't support the current stream
1665                  * type. See soc_pcm_init_runtime_hw() for more details
1666                  */
1667                 if (!snd_soc_dai_stream_valid(dai, stream))
1668                         continue;
1669
1670                 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1671
1672                 soc_pcm_hw_update_rate(hw, cpu_stream);
1673                 soc_pcm_hw_update_chan(hw, cpu_stream);
1674                 soc_pcm_hw_update_format(hw, cpu_stream);
1675         }
1676
1677 }
1678
1679 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
1680 {
1681         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1682         struct snd_pcm_runtime *runtime = substream->runtime;
1683         struct snd_pcm_hardware *hw = &runtime->hw;
1684         struct snd_soc_dpcm *dpcm;
1685         struct snd_soc_dai *dai;
1686         int stream = substream->stream;
1687
1688         if (!fe->dai_link->dpcm_merged_format)
1689                 return;
1690
1691         /*
1692          * It returns merged BE codec format
1693          * if FE want to use it (= dpcm_merged_format)
1694          */
1695
1696         for_each_dpcm_be(fe, stream, dpcm) {
1697                 struct snd_soc_pcm_runtime *be = dpcm->be;
1698                 struct snd_soc_pcm_stream *codec_stream;
1699                 int i;
1700
1701                 for_each_rtd_codec_dais(be, i, dai) {
1702                         /*
1703                          * Skip CODECs which don't support the current stream
1704                          * type. See soc_pcm_init_runtime_hw() for more details
1705                          */
1706                         if (!snd_soc_dai_stream_valid(dai, stream))
1707                                 continue;
1708
1709                         codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1710
1711                         soc_pcm_hw_update_format(hw, codec_stream);
1712                 }
1713         }
1714 }
1715
1716 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
1717 {
1718         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1719         struct snd_pcm_runtime *runtime = substream->runtime;
1720         struct snd_pcm_hardware *hw = &runtime->hw;
1721         struct snd_soc_dpcm *dpcm;
1722         int stream = substream->stream;
1723
1724         if (!fe->dai_link->dpcm_merged_chan)
1725                 return;
1726
1727         /*
1728          * It returns merged BE codec channel;
1729          * if FE want to use it (= dpcm_merged_chan)
1730          */
1731
1732         for_each_dpcm_be(fe, stream, dpcm) {
1733                 struct snd_soc_pcm_runtime *be = dpcm->be;
1734                 struct snd_soc_pcm_stream *cpu_stream;
1735                 struct snd_soc_dai *dai;
1736                 int i;
1737
1738                 for_each_rtd_cpu_dais(be, i, dai) {
1739                         /*
1740                          * Skip CPUs which don't support the current stream
1741                          * type. See soc_pcm_init_runtime_hw() for more details
1742                          */
1743                         if (!snd_soc_dai_stream_valid(dai, stream))
1744                                 continue;
1745
1746                         cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1747
1748                         soc_pcm_hw_update_chan(hw, cpu_stream);
1749                 }
1750
1751                 /*
1752                  * chan min/max cannot be enforced if there are multiple CODEC
1753                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1754                  */
1755                 if (be->dai_link->num_codecs == 1) {
1756                         struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
1757                                 asoc_rtd_to_codec(be, 0), stream);
1758
1759                         soc_pcm_hw_update_chan(hw, codec_stream);
1760                 }
1761         }
1762 }
1763
1764 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
1765 {
1766         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1767         struct snd_pcm_runtime *runtime = substream->runtime;
1768         struct snd_pcm_hardware *hw = &runtime->hw;
1769         struct snd_soc_dpcm *dpcm;
1770         int stream = substream->stream;
1771
1772         if (!fe->dai_link->dpcm_merged_rate)
1773                 return;
1774
1775         /*
1776          * It returns merged BE codec channel;
1777          * if FE want to use it (= dpcm_merged_chan)
1778          */
1779
1780         for_each_dpcm_be(fe, stream, dpcm) {
1781                 struct snd_soc_pcm_runtime *be = dpcm->be;
1782                 struct snd_soc_pcm_stream *pcm;
1783                 struct snd_soc_dai *dai;
1784                 int i;
1785
1786                 for_each_rtd_dais(be, i, dai) {
1787                         /*
1788                          * Skip DAIs which don't support the current stream
1789                          * type. See soc_pcm_init_runtime_hw() for more details
1790                          */
1791                         if (!snd_soc_dai_stream_valid(dai, stream))
1792                                 continue;
1793
1794                         pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1795
1796                         soc_pcm_hw_update_rate(hw, pcm);
1797                 }
1798         }
1799 }
1800
1801 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1802                                int stream)
1803 {
1804         struct snd_soc_dpcm *dpcm;
1805         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1806         struct snd_soc_dai *fe_cpu_dai;
1807         int err = 0;
1808         int i;
1809
1810         /* apply symmetry for FE */
1811         soc_pcm_update_symmetry(fe_substream);
1812
1813         for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1814                 /* Symmetry only applies if we've got an active stream. */
1815                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1816                 if (err < 0)
1817                         goto error;
1818         }
1819
1820         /* apply symmetry for BE */
1821         for_each_dpcm_be(fe, stream, dpcm) {
1822                 struct snd_soc_pcm_runtime *be = dpcm->be;
1823                 struct snd_pcm_substream *be_substream =
1824                         snd_soc_dpcm_get_substream(be, stream);
1825                 struct snd_soc_pcm_runtime *rtd;
1826                 struct snd_soc_dai *dai;
1827
1828                 /* A backend may not have the requested substream */
1829                 if (!be_substream)
1830                         continue;
1831
1832                 rtd = asoc_substream_to_rtd(be_substream);
1833                 if (rtd->dai_link->be_hw_params_fixup)
1834                         continue;
1835
1836                 soc_pcm_update_symmetry(be_substream);
1837
1838                 /* Symmetry only applies if we've got an active stream. */
1839                 for_each_rtd_dais(rtd, i, dai) {
1840                         err = soc_pcm_apply_symmetry(fe_substream, dai);
1841                         if (err < 0)
1842                                 goto error;
1843                 }
1844         }
1845 error:
1846         return soc_pcm_ret(fe, err);
1847 }
1848
1849 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1850 {
1851         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1852         int stream = fe_substream->stream, ret = 0;
1853
1854         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1855
1856         ret = dpcm_be_dai_startup(fe, stream);
1857         if (ret < 0)
1858                 goto be_err;
1859
1860         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1861
1862         /* start the DAI frontend */
1863         ret = __soc_pcm_open(fe, fe_substream);
1864         if (ret < 0)
1865                 goto unwind;
1866
1867         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1868
1869         dpcm_runtime_setup_fe(fe_substream);
1870
1871         dpcm_runtime_setup_be_format(fe_substream);
1872         dpcm_runtime_setup_be_chan(fe_substream);
1873         dpcm_runtime_setup_be_rate(fe_substream);
1874
1875         ret = dpcm_apply_symmetry(fe_substream, stream);
1876
1877 unwind:
1878         if (ret < 0)
1879                 dpcm_be_dai_startup_unwind(fe, stream);
1880 be_err:
1881         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1882
1883         return soc_pcm_ret(fe, ret);
1884 }
1885
1886 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1887 {
1888         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1889         int stream = substream->stream;
1890
1891         snd_soc_dpcm_mutex_assert_held(fe);
1892
1893         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1894
1895         /* shutdown the BEs */
1896         dpcm_be_dai_shutdown(fe, stream);
1897
1898         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1899
1900         /* now shutdown the frontend */
1901         __soc_pcm_close(fe, substream);
1902
1903         /* run the stream stop event */
1904         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1905
1906         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1907         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1908         return 0;
1909 }
1910
1911 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1912 {
1913         struct snd_soc_dpcm *dpcm;
1914
1915         /* only hw_params backends that are either sinks or sources
1916          * to this frontend DAI */
1917         for_each_dpcm_be(fe, stream, dpcm) {
1918
1919                 struct snd_soc_pcm_runtime *be = dpcm->be;
1920                 struct snd_pcm_substream *be_substream =
1921                         snd_soc_dpcm_get_substream(be, stream);
1922
1923                 /* is this op for this BE ? */
1924                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1925                         continue;
1926
1927                 /* only free hw when no longer used - check all FEs */
1928                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1929                                 continue;
1930
1931                 /* do not free hw if this BE is used by other FE */
1932                 if (be->dpcm[stream].users > 1)
1933                         continue;
1934
1935                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1936                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1937                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1938                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1939                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1940                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1941                         continue;
1942
1943                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1944                         be->dai_link->name);
1945
1946                 __soc_pcm_hw_free(be, be_substream);
1947
1948                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1949         }
1950 }
1951
1952 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1953 {
1954         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1955         int stream = substream->stream;
1956
1957         snd_soc_dpcm_mutex_lock(fe);
1958         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1959
1960         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1961
1962         /* call hw_free on the frontend */
1963         soc_pcm_hw_clean(fe, substream, 0);
1964
1965         /* only hw_params backends that are either sinks or sources
1966          * to this frontend DAI */
1967         dpcm_be_dai_hw_free(fe, stream);
1968
1969         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1970         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1971
1972         snd_soc_dpcm_mutex_unlock(fe);
1973         return 0;
1974 }
1975
1976 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1977 {
1978         struct snd_soc_pcm_runtime *be;
1979         struct snd_pcm_substream *be_substream;
1980         struct snd_soc_dpcm *dpcm;
1981         int ret;
1982
1983         for_each_dpcm_be(fe, stream, dpcm) {
1984                 struct snd_pcm_hw_params hw_params;
1985
1986                 be = dpcm->be;
1987                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1988
1989                 /* is this op for this BE ? */
1990                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1991                         continue;
1992
1993                 /* copy params for each dpcm */
1994                 memcpy(&hw_params, &fe->dpcm[stream].hw_params,
1995                                 sizeof(struct snd_pcm_hw_params));
1996
1997                 /* perform any hw_params fixups */
1998                 ret = snd_soc_link_be_hw_params_fixup(be, &hw_params);
1999                 if (ret < 0)
2000                         goto unwind;
2001
2002                 /* copy the fixed-up hw params for BE dai */
2003                 memcpy(&be->dpcm[stream].hw_params, &hw_params,
2004                        sizeof(struct snd_pcm_hw_params));
2005
2006                 /* only allow hw_params() if no connected FEs are running */
2007                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2008                         continue;
2009
2010                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2011                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2012                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2013                         continue;
2014
2015                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2016                         be->dai_link->name);
2017
2018                 ret = __soc_pcm_hw_params(be, be_substream, &hw_params);
2019                 if (ret < 0)
2020                         goto unwind;
2021
2022                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2023         }
2024         return 0;
2025
2026 unwind:
2027         dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2028                 __func__, be->dai_link->name, ret);
2029
2030         /* disable any enabled and non active backends */
2031         for_each_dpcm_be_rollback(fe, stream, dpcm) {
2032                 be = dpcm->be;
2033                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2034
2035                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2036                         continue;
2037
2038                 /* only allow hw_free() if no connected FEs are running */
2039                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2040                         continue;
2041
2042                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2043                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2044                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2045                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2046                         continue;
2047
2048                 __soc_pcm_hw_free(be, be_substream);
2049         }
2050
2051         return ret;
2052 }
2053
2054 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2055                                  struct snd_pcm_hw_params *params)
2056 {
2057         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2058         int ret, stream = substream->stream;
2059
2060         snd_soc_dpcm_mutex_lock(fe);
2061         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2062
2063         memcpy(&fe->dpcm[stream].hw_params, params,
2064                         sizeof(struct snd_pcm_hw_params));
2065         ret = dpcm_be_dai_hw_params(fe, stream);
2066         if (ret < 0)
2067                 goto out;
2068
2069         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2070                         fe->dai_link->name, params_rate(params),
2071                         params_channels(params), params_format(params));
2072
2073         /* call hw_params on the frontend */
2074         ret = __soc_pcm_hw_params(fe, substream, params);
2075         if (ret < 0)
2076                 dpcm_be_dai_hw_free(fe, stream);
2077         else
2078                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2079
2080 out:
2081         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2082         snd_soc_dpcm_mutex_unlock(fe);
2083
2084         return soc_pcm_ret(fe, ret);
2085 }
2086
2087 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2088                                int cmd)
2089 {
2090         struct snd_soc_pcm_runtime *be;
2091         bool pause_stop_transition;
2092         struct snd_soc_dpcm *dpcm;
2093         unsigned long flags;
2094         int ret = 0;
2095
2096         for_each_dpcm_be(fe, stream, dpcm) {
2097                 struct snd_pcm_substream *be_substream;
2098
2099                 be = dpcm->be;
2100                 be_substream = snd_soc_dpcm_get_substream(be, stream);
2101
2102                 snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
2103
2104                 /* is this op for this BE ? */
2105                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2106                         goto next;
2107
2108                 dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
2109                         be->dai_link->name, cmd);
2110
2111                 switch (cmd) {
2112                 case SNDRV_PCM_TRIGGER_START:
2113                         if (!be->dpcm[stream].be_start &&
2114                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2115                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2116                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2117                                 goto next;
2118
2119                         be->dpcm[stream].be_start++;
2120                         if (be->dpcm[stream].be_start != 1)
2121                                 goto next;
2122
2123                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
2124                                 ret = soc_pcm_trigger(be_substream,
2125                                                       SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
2126                         else
2127                                 ret = soc_pcm_trigger(be_substream,
2128                                                       SNDRV_PCM_TRIGGER_START);
2129                         if (ret) {
2130                                 be->dpcm[stream].be_start--;
2131                                 goto next;
2132                         }
2133
2134                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2135                         break;
2136                 case SNDRV_PCM_TRIGGER_RESUME:
2137                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2138                                 goto next;
2139
2140                         be->dpcm[stream].be_start++;
2141                         if (be->dpcm[stream].be_start != 1)
2142                                 goto next;
2143
2144                         ret = soc_pcm_trigger(be_substream, cmd);
2145                         if (ret) {
2146                                 be->dpcm[stream].be_start--;
2147                                 goto next;
2148                         }
2149
2150                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2151                         break;
2152                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2153                         if (!be->dpcm[stream].be_start &&
2154                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2155                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2156                                 goto next;
2157
2158                         fe->dpcm[stream].fe_pause = false;
2159                         be->dpcm[stream].be_pause--;
2160
2161                         be->dpcm[stream].be_start++;
2162                         if (be->dpcm[stream].be_start != 1)
2163                                 goto next;
2164
2165                         ret = soc_pcm_trigger(be_substream, cmd);
2166                         if (ret) {
2167                                 be->dpcm[stream].be_start--;
2168                                 goto next;
2169                         }
2170
2171                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2172                         break;
2173                 case SNDRV_PCM_TRIGGER_STOP:
2174                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2175                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2176                                 goto next;
2177
2178                         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2179                                 be->dpcm[stream].be_start--;
2180
2181                         if (be->dpcm[stream].be_start != 0)
2182                                 goto next;
2183
2184                         pause_stop_transition = false;
2185                         if (fe->dpcm[stream].fe_pause) {
2186                                 pause_stop_transition = true;
2187                                 fe->dpcm[stream].fe_pause = false;
2188                                 be->dpcm[stream].be_pause--;
2189                         }
2190
2191                         if (be->dpcm[stream].be_pause != 0)
2192                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
2193                         else
2194                                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
2195
2196                         if (ret) {
2197                                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2198                                         be->dpcm[stream].be_start++;
2199                                 if (pause_stop_transition) {
2200                                         fe->dpcm[stream].fe_pause = true;
2201                                         be->dpcm[stream].be_pause++;
2202                                 }
2203                                 goto next;
2204                         }
2205
2206                         if (be->dpcm[stream].be_pause != 0)
2207                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2208                         else
2209                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2210
2211                         break;
2212                 case SNDRV_PCM_TRIGGER_SUSPEND:
2213                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2214                                 goto next;
2215
2216                         be->dpcm[stream].be_start--;
2217                         if (be->dpcm[stream].be_start != 0)
2218                                 goto next;
2219
2220                         ret = soc_pcm_trigger(be_substream, cmd);
2221                         if (ret) {
2222                                 be->dpcm[stream].be_start++;
2223                                 goto next;
2224                         }
2225
2226                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2227                         break;
2228                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2229                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2230                                 goto next;
2231
2232                         fe->dpcm[stream].fe_pause = true;
2233                         be->dpcm[stream].be_pause++;
2234
2235                         be->dpcm[stream].be_start--;
2236                         if (be->dpcm[stream].be_start != 0)
2237                                 goto next;
2238
2239                         ret = soc_pcm_trigger(be_substream, cmd);
2240                         if (ret) {
2241                                 be->dpcm[stream].be_start++;
2242                                 goto next;
2243                         }
2244
2245                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2246                         break;
2247                 }
2248 next:
2249                 snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
2250                 if (ret)
2251                         break;
2252         }
2253         return soc_pcm_ret(fe, ret);
2254 }
2255 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2256
2257 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2258                                   int cmd, bool fe_first)
2259 {
2260         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2261         int ret;
2262
2263         /* call trigger on the frontend before the backend. */
2264         if (fe_first) {
2265                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2266                         fe->dai_link->name, cmd);
2267
2268                 ret = soc_pcm_trigger(substream, cmd);
2269                 if (ret < 0)
2270                         return ret;
2271
2272                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2273                 return ret;
2274         }
2275
2276         /* call trigger on the frontend after the backend. */
2277         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2278         if (ret < 0)
2279                 return ret;
2280
2281         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2282                 fe->dai_link->name, cmd);
2283
2284         ret = soc_pcm_trigger(substream, cmd);
2285
2286         return ret;
2287 }
2288
2289 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2290 {
2291         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2292         int stream = substream->stream;
2293         int ret = 0;
2294         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2295
2296         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2297
2298         switch (trigger) {
2299         case SND_SOC_DPCM_TRIGGER_PRE:
2300                 switch (cmd) {
2301                 case SNDRV_PCM_TRIGGER_START:
2302                 case SNDRV_PCM_TRIGGER_RESUME:
2303                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2304                 case SNDRV_PCM_TRIGGER_DRAIN:
2305                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2306                         break;
2307                 case SNDRV_PCM_TRIGGER_STOP:
2308                 case SNDRV_PCM_TRIGGER_SUSPEND:
2309                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2310                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2311                         break;
2312                 default:
2313                         ret = -EINVAL;
2314                         break;
2315                 }
2316                 break;
2317         case SND_SOC_DPCM_TRIGGER_POST:
2318                 switch (cmd) {
2319                 case SNDRV_PCM_TRIGGER_START:
2320                 case SNDRV_PCM_TRIGGER_RESUME:
2321                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2322                 case SNDRV_PCM_TRIGGER_DRAIN:
2323                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2324                         break;
2325                 case SNDRV_PCM_TRIGGER_STOP:
2326                 case SNDRV_PCM_TRIGGER_SUSPEND:
2327                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2328                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2329                         break;
2330                 default:
2331                         ret = -EINVAL;
2332                         break;
2333                 }
2334                 break;
2335         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2336                 /* bespoke trigger() - handles both FE and BEs */
2337
2338                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2339                                 fe->dai_link->name, cmd);
2340
2341                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2342                 break;
2343         default:
2344                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2345                                 fe->dai_link->name);
2346                 ret = -EINVAL;
2347                 goto out;
2348         }
2349
2350         if (ret < 0) {
2351                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2352                         cmd, ret);
2353                 goto out;
2354         }
2355
2356         switch (cmd) {
2357         case SNDRV_PCM_TRIGGER_START:
2358         case SNDRV_PCM_TRIGGER_RESUME:
2359         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2360                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2361                 break;
2362         case SNDRV_PCM_TRIGGER_STOP:
2363         case SNDRV_PCM_TRIGGER_SUSPEND:
2364                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2365                 break;
2366         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2367                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2368                 break;
2369         }
2370
2371 out:
2372         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2373         return ret;
2374 }
2375
2376 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2377 {
2378         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2379         int stream = substream->stream;
2380
2381         /* if FE's runtime_update is already set, we're in race;
2382          * process this trigger later at exit
2383          */
2384         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2385                 fe->dpcm[stream].trigger_pending = cmd + 1;
2386                 return 0; /* delayed, assuming it's successful */
2387         }
2388
2389         /* we're alone, let's trigger */
2390         return dpcm_fe_dai_do_trigger(substream, cmd);
2391 }
2392
2393 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2394 {
2395         struct snd_soc_dpcm *dpcm;
2396         int ret = 0;
2397
2398         for_each_dpcm_be(fe, stream, dpcm) {
2399
2400                 struct snd_soc_pcm_runtime *be = dpcm->be;
2401                 struct snd_pcm_substream *be_substream =
2402                         snd_soc_dpcm_get_substream(be, stream);
2403
2404                 /* is this op for this BE ? */
2405                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2406                         continue;
2407
2408                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2409                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2410                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2411                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2412                         continue;
2413
2414                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2415                         be->dai_link->name);
2416
2417                 ret = __soc_pcm_prepare(be, be_substream);
2418                 if (ret < 0)
2419                         break;
2420
2421                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2422         }
2423
2424         return soc_pcm_ret(fe, ret);
2425 }
2426
2427 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2428 {
2429         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2430         int stream = substream->stream, ret = 0;
2431
2432         snd_soc_dpcm_mutex_lock(fe);
2433
2434         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2435
2436         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2437
2438         /* there is no point preparing this FE if there are no BEs */
2439         if (list_empty(&fe->dpcm[stream].be_clients)) {
2440                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2441                                 fe->dai_link->name);
2442                 ret = -EINVAL;
2443                 goto out;
2444         }
2445
2446         ret = dpcm_be_dai_prepare(fe, stream);
2447         if (ret < 0)
2448                 goto out;
2449
2450         /* call prepare on the frontend */
2451         ret = __soc_pcm_prepare(fe, substream);
2452         if (ret < 0)
2453                 goto out;
2454
2455         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2456
2457 out:
2458         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2459         snd_soc_dpcm_mutex_unlock(fe);
2460
2461         return soc_pcm_ret(fe, ret);
2462 }
2463
2464 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2465 {
2466         struct snd_pcm_substream *substream =
2467                 snd_soc_dpcm_get_substream(fe, stream);
2468         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2469         int err;
2470
2471         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2472                         stream ? "capture" : "playback", fe->dai_link->name);
2473
2474         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2475                 /* call bespoke trigger - FE takes care of all BE triggers */
2476                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2477                                 fe->dai_link->name);
2478
2479                 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2480         } else {
2481                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2482                         fe->dai_link->name);
2483
2484                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2485         }
2486
2487         dpcm_be_dai_hw_free(fe, stream);
2488
2489         dpcm_be_dai_shutdown(fe, stream);
2490
2491         /* run the stream event for each BE */
2492         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2493
2494         return soc_pcm_ret(fe, err);
2495 }
2496
2497 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2498 {
2499         struct snd_pcm_substream *substream =
2500                 snd_soc_dpcm_get_substream(fe, stream);
2501         struct snd_soc_dpcm *dpcm;
2502         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2503         int ret = 0;
2504
2505         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2506                         stream ? "capture" : "playback", fe->dai_link->name);
2507
2508         /* Only start the BE if the FE is ready */
2509         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2510                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
2511                 dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
2512                         fe->dai_link->name, fe->dpcm[stream].state);
2513                 ret = -EINVAL;
2514                 goto disconnect;
2515         }
2516
2517         /* startup must always be called for new BEs */
2518         ret = dpcm_be_dai_startup(fe, stream);
2519         if (ret < 0)
2520                 goto disconnect;
2521
2522         /* keep going if FE state is > open */
2523         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2524                 return 0;
2525
2526         ret = dpcm_be_dai_hw_params(fe, stream);
2527         if (ret < 0)
2528                 goto close;
2529
2530         /* keep going if FE state is > hw_params */
2531         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2532                 return 0;
2533
2534         ret = dpcm_be_dai_prepare(fe, stream);
2535         if (ret < 0)
2536                 goto hw_free;
2537
2538         /* run the stream event for each BE */
2539         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2540
2541         /* keep going if FE state is > prepare */
2542         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2543                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2544                 return 0;
2545
2546         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2547                 /* call trigger on the frontend - FE takes care of all BE triggers */
2548                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2549                                 fe->dai_link->name);
2550
2551                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2552                 if (ret < 0)
2553                         goto hw_free;
2554         } else {
2555                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2556                         fe->dai_link->name);
2557
2558                 ret = dpcm_be_dai_trigger(fe, stream,
2559                                         SNDRV_PCM_TRIGGER_START);
2560                 if (ret < 0)
2561                         goto hw_free;
2562         }
2563
2564         return 0;
2565
2566 hw_free:
2567         dpcm_be_dai_hw_free(fe, stream);
2568 close:
2569         dpcm_be_dai_shutdown(fe, stream);
2570 disconnect:
2571         /* disconnect any pending BEs */
2572         for_each_dpcm_be(fe, stream, dpcm) {
2573                 struct snd_soc_pcm_runtime *be = dpcm->be;
2574
2575                 /* is this op for this BE ? */
2576                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2577                         continue;
2578
2579                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
2580                         be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
2581                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2582         }
2583
2584         return soc_pcm_ret(fe, ret);
2585 }
2586
2587 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2588 {
2589         struct snd_soc_dapm_widget_list *list;
2590         int stream;
2591         int count, paths;
2592
2593         if (!fe->dai_link->dynamic)
2594                 return 0;
2595
2596         if (fe->dai_link->num_cpus > 1) {
2597                 dev_err(fe->dev,
2598                         "%s doesn't support Multi CPU yet\n", __func__);
2599                 return -EINVAL;
2600         }
2601
2602         /* only check active links */
2603         if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
2604                 return 0;
2605
2606         /* DAPM sync will call this to update DSP paths */
2607         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2608                 new ? "new" : "old", fe->dai_link->name);
2609
2610         for_each_pcm_streams(stream) {
2611
2612                 /* skip if FE doesn't have playback/capture capability */
2613                 if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
2614                     !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
2615                         continue;
2616
2617                 /* skip if FE isn't currently playing/capturing */
2618                 if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
2619                     !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
2620                         continue;
2621
2622                 paths = dpcm_path_get(fe, stream, &list);
2623                 if (paths < 0)
2624                         return paths;
2625
2626                 /* update any playback/capture paths */
2627                 count = dpcm_process_paths(fe, stream, &list, new);
2628                 if (count) {
2629                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2630                         if (new)
2631                                 dpcm_run_update_startup(fe, stream);
2632                         else
2633                                 dpcm_run_update_shutdown(fe, stream);
2634                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2635
2636                         dpcm_clear_pending_state(fe, stream);
2637                         dpcm_be_disconnect(fe, stream);
2638                 }
2639
2640                 dpcm_path_put(&list);
2641         }
2642
2643         return 0;
2644 }
2645
2646 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2647  * any DAI links.
2648  */
2649 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2650 {
2651         struct snd_soc_pcm_runtime *fe;
2652         int ret = 0;
2653
2654         snd_soc_dpcm_mutex_lock(card);
2655         /* shutdown all old paths first */
2656         for_each_card_rtds(card, fe) {
2657                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2658                 if (ret)
2659                         goto out;
2660         }
2661
2662         /* bring new paths up */
2663         for_each_card_rtds(card, fe) {
2664                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2665                 if (ret)
2666                         goto out;
2667         }
2668
2669 out:
2670         snd_soc_dpcm_mutex_unlock(card);
2671         return ret;
2672 }
2673 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2674
2675 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2676 {
2677         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2678         struct snd_soc_dpcm *dpcm;
2679         int stream = fe_substream->stream;
2680
2681         snd_soc_dpcm_mutex_assert_held(fe);
2682
2683         /* mark FE's links ready to prune */
2684         for_each_dpcm_be(fe, stream, dpcm)
2685                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2686
2687         dpcm_be_disconnect(fe, stream);
2688 }
2689
2690 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2691 {
2692         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2693         int ret;
2694
2695         snd_soc_dpcm_mutex_lock(fe);
2696         ret = dpcm_fe_dai_shutdown(fe_substream);
2697
2698         dpcm_fe_dai_cleanup(fe_substream);
2699
2700         snd_soc_dpcm_mutex_unlock(fe);
2701         return ret;
2702 }
2703
2704 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2705 {
2706         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2707         struct snd_soc_dapm_widget_list *list;
2708         int ret;
2709         int stream = fe_substream->stream;
2710
2711         snd_soc_dpcm_mutex_lock(fe);
2712
2713         ret = dpcm_path_get(fe, stream, &list);
2714         if (ret < 0)
2715                 goto open_end;
2716
2717         /* calculate valid and active FE <-> BE dpcms */
2718         dpcm_process_paths(fe, stream, &list, 1);
2719
2720         ret = dpcm_fe_dai_startup(fe_substream);
2721         if (ret < 0)
2722                 dpcm_fe_dai_cleanup(fe_substream);
2723
2724         dpcm_clear_pending_state(fe, stream);
2725         dpcm_path_put(&list);
2726 open_end:
2727         snd_soc_dpcm_mutex_unlock(fe);
2728         return ret;
2729 }
2730
2731 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
2732                                     int *playback, int *capture)
2733 {
2734         struct snd_soc_dai *cpu_dai;
2735         int i;
2736
2737         if (rtd->dai_link->dynamic && rtd->dai_link->num_cpus > 1) {
2738                 dev_err(rtd->dev,
2739                         "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2740                 return -EINVAL;
2741         }
2742
2743         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2744                 int stream;
2745
2746                 if (rtd->dai_link->dpcm_playback) {
2747                         stream = SNDRV_PCM_STREAM_PLAYBACK;
2748
2749                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2750                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2751                                         *playback = 1;
2752                                         break;
2753                                 }
2754                         }
2755                         if (!*playback) {
2756                                 dev_err(rtd->card->dev,
2757                                         "No CPU DAIs support playback for stream %s\n",
2758                                         rtd->dai_link->stream_name);
2759                                 return -EINVAL;
2760                         }
2761                 }
2762                 if (rtd->dai_link->dpcm_capture) {
2763                         stream = SNDRV_PCM_STREAM_CAPTURE;
2764
2765                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2766                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2767                                         *capture = 1;
2768                                         break;
2769                                 }
2770                         }
2771
2772                         if (!*capture) {
2773                                 dev_err(rtd->card->dev,
2774                                         "No CPU DAIs support capture for stream %s\n",
2775                                         rtd->dai_link->stream_name);
2776                                 return -EINVAL;
2777                         }
2778                 }
2779         } else {
2780                 struct snd_soc_dai *codec_dai;
2781
2782                 /* Adapt stream for codec2codec links */
2783                 int cpu_capture = rtd->dai_link->c2c_params ?
2784                         SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
2785                 int cpu_playback = rtd->dai_link->c2c_params ?
2786                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2787
2788                 for_each_rtd_codec_dais(rtd, i, codec_dai) {
2789                         if (rtd->dai_link->num_cpus == 1) {
2790                                 cpu_dai = asoc_rtd_to_cpu(rtd, 0);
2791                         } else if (rtd->dai_link->num_cpus == rtd->dai_link->num_codecs) {
2792                                 cpu_dai = asoc_rtd_to_cpu(rtd, i);
2793                         } else {
2794                                 dev_err(rtd->card->dev,
2795                                         "N cpus to M codecs link is not supported yet\n");
2796                                 return -EINVAL;
2797                         }
2798
2799                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2800                             snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2801                                 *playback = 1;
2802                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2803                             snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2804                                 *capture = 1;
2805                 }
2806         }
2807
2808         if (rtd->dai_link->playback_only) {
2809                 *playback = 1;
2810                 *capture = 0;
2811         }
2812
2813         if (rtd->dai_link->capture_only) {
2814                 *playback = 0;
2815                 *capture = 1;
2816         }
2817
2818         return 0;
2819 }
2820
2821 static int soc_create_pcm(struct snd_pcm **pcm,
2822                           struct snd_soc_pcm_runtime *rtd,
2823                           int playback, int capture, int num)
2824 {
2825         char new_name[64];
2826         int ret;
2827
2828         /* create the PCM */
2829         if (rtd->dai_link->c2c_params) {
2830                 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2831                          rtd->dai_link->stream_name);
2832
2833                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2834                                            playback, capture, pcm);
2835         } else if (rtd->dai_link->no_pcm) {
2836                 snprintf(new_name, sizeof(new_name), "(%s)",
2837                         rtd->dai_link->stream_name);
2838
2839                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2840                                 playback, capture, pcm);
2841         } else {
2842                 if (rtd->dai_link->dynamic)
2843                         snprintf(new_name, sizeof(new_name), "%s (*)",
2844                                 rtd->dai_link->stream_name);
2845                 else
2846                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2847                                 rtd->dai_link->stream_name,
2848                                 soc_codec_dai_name(rtd), num);
2849
2850                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2851                         capture, pcm);
2852         }
2853         if (ret < 0) {
2854                 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2855                         new_name, rtd->dai_link->name, ret);
2856                 return ret;
2857         }
2858         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2859
2860         return 0;
2861 }
2862
2863 /* create a new pcm */
2864 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2865 {
2866         struct snd_soc_component *component;
2867         struct snd_pcm *pcm;
2868         int ret = 0, playback = 0, capture = 0;
2869         int i;
2870
2871         ret = soc_get_playback_capture(rtd, &playback, &capture);
2872         if (ret < 0)
2873                 return ret;
2874
2875         ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
2876         if (ret < 0)
2877                 return ret;
2878
2879         /* DAPM dai link stream work */
2880         /*
2881          * Currently nothing to do for c2c links
2882          * Since c2c links are internal nodes in the DAPM graph and
2883          * don't interface with the outside world or application layer
2884          * we don't have to do any special handling on close.
2885          */
2886         if (!rtd->dai_link->c2c_params)
2887                 rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2888
2889         rtd->pcm = pcm;
2890         pcm->nonatomic = rtd->dai_link->nonatomic;
2891         pcm->private_data = rtd;
2892         pcm->no_device_suspend = true;
2893
2894         if (rtd->dai_link->no_pcm || rtd->dai_link->c2c_params) {
2895                 if (playback)
2896                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2897                 if (capture)
2898                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2899                 goto out;
2900         }
2901
2902         /* ASoC PCM operations */
2903         if (rtd->dai_link->dynamic) {
2904                 rtd->ops.open           = dpcm_fe_dai_open;
2905                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2906                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2907                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2908                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2909                 rtd->ops.close          = dpcm_fe_dai_close;
2910                 rtd->ops.pointer        = soc_pcm_pointer;
2911         } else {
2912                 rtd->ops.open           = soc_pcm_open;
2913                 rtd->ops.hw_params      = soc_pcm_hw_params;
2914                 rtd->ops.prepare        = soc_pcm_prepare;
2915                 rtd->ops.trigger        = soc_pcm_trigger;
2916                 rtd->ops.hw_free        = soc_pcm_hw_free;
2917                 rtd->ops.close          = soc_pcm_close;
2918                 rtd->ops.pointer        = soc_pcm_pointer;
2919         }
2920
2921         for_each_rtd_components(rtd, i, component) {
2922                 const struct snd_soc_component_driver *drv = component->driver;
2923
2924                 if (drv->ioctl)
2925                         rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2926                 if (drv->sync_stop)
2927                         rtd->ops.sync_stop      = snd_soc_pcm_component_sync_stop;
2928                 if (drv->copy_user)
2929                         rtd->ops.copy_user      = snd_soc_pcm_component_copy_user;
2930                 if (drv->page)
2931                         rtd->ops.page           = snd_soc_pcm_component_page;
2932                 if (drv->mmap)
2933                         rtd->ops.mmap           = snd_soc_pcm_component_mmap;
2934                 if (drv->ack)
2935                         rtd->ops.ack            = snd_soc_pcm_component_ack;
2936         }
2937
2938         if (playback)
2939                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2940
2941         if (capture)
2942                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2943
2944         ret = snd_soc_pcm_component_new(rtd);
2945         if (ret < 0)
2946                 return ret;
2947 out:
2948         dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
2949                 soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
2950         return ret;
2951 }
2952
2953 /* is the current PCM operation for this FE ? */
2954 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2955 {
2956         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2957                 return 1;
2958         return 0;
2959 }
2960 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2961
2962 /* is the current PCM operation for this BE ? */
2963 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2964                 struct snd_soc_pcm_runtime *be, int stream)
2965 {
2966         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2967            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2968                   be->dpcm[stream].runtime_update))
2969                 return 1;
2970         return 0;
2971 }
2972 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2973
2974 /* get the substream for this BE */
2975 struct snd_pcm_substream *
2976         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2977 {
2978         return be->pcm->streams[stream].substream;
2979 }
2980 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2981
2982 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
2983                                     struct snd_soc_pcm_runtime *be,
2984                                     int stream,
2985                                     const enum snd_soc_dpcm_state *states,
2986                                     int num_states)
2987 {
2988         struct snd_soc_dpcm *dpcm;
2989         int state;
2990         int ret = 1;
2991         int i;
2992
2993         for_each_dpcm_fe(be, stream, dpcm) {
2994
2995                 if (dpcm->fe == fe)
2996                         continue;
2997
2998                 state = dpcm->fe->dpcm[stream].state;
2999                 for (i = 0; i < num_states; i++) {
3000                         if (state == states[i]) {
3001                                 ret = 0;
3002                                 break;
3003                         }
3004                 }
3005         }
3006
3007         /* it's safe to do this BE DAI */
3008         return ret;
3009 }
3010
3011 /*
3012  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3013  * are not running, paused or suspended for the specified stream direction.
3014  */
3015 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3016                 struct snd_soc_pcm_runtime *be, int stream)
3017 {
3018         const enum snd_soc_dpcm_state state[] = {
3019                 SND_SOC_DPCM_STATE_START,
3020                 SND_SOC_DPCM_STATE_PAUSED,
3021                 SND_SOC_DPCM_STATE_SUSPEND,
3022         };
3023
3024         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3025 }
3026 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3027
3028 /*
3029  * We can only change hw params a BE DAI if any of it's FE are not prepared,
3030  * running, paused or suspended for the specified stream direction.
3031  */
3032 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3033                 struct snd_soc_pcm_runtime *be, int stream)
3034 {
3035         const enum snd_soc_dpcm_state state[] = {
3036                 SND_SOC_DPCM_STATE_START,
3037                 SND_SOC_DPCM_STATE_PAUSED,
3038                 SND_SOC_DPCM_STATE_SUSPEND,
3039                 SND_SOC_DPCM_STATE_PREPARE,
3040         };
3041
3042         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3043 }
3044 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);