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 DPCM_MAX_BE_USERS       8
  31
  32 static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd)
  33 {
  34         return (rtd)->num_cpus == 1 ? asoc_rtd_to_cpu(rtd, 0)->name : "multicpu";
  35 }
  36 static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd)
  37 {
  38         return (rtd)->num_codecs == 1 ? asoc_rtd_to_codec(rtd, 0)->name : "multicodec";
  39 }
  40
  41 #ifdef CONFIG_DEBUG_FS
  42 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
  43 {
  44         switch (state) {
  45         case SND_SOC_DPCM_STATE_NEW:
  46                 return "new";
  47         case SND_SOC_DPCM_STATE_OPEN:
  48                 return "open";
  49         case SND_SOC_DPCM_STATE_HW_PARAMS:
  50                 return "hw_params";
  51         case SND_SOC_DPCM_STATE_PREPARE:
  52                 return "prepare";
  53         case SND_SOC_DPCM_STATE_START:
  54                 return "start";
  55         case SND_SOC_DPCM_STATE_STOP:
  56                 return "stop";
  57         case SND_SOC_DPCM_STATE_SUSPEND:
  58                 return "suspend";
  59         case SND_SOC_DPCM_STATE_PAUSED:
  60                 return "paused";
  61         case SND_SOC_DPCM_STATE_HW_FREE:
  62                 return "hw_free";
  63         case SND_SOC_DPCM_STATE_CLOSE:
  64                 return "close";
  65         }
  66
  67         return "unknown";
  68 }
  69
  70 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
  71                                int stream, char *buf, size_t size)
  72 {
  73         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
  74         struct snd_soc_dpcm *dpcm;
  75         ssize_t offset = 0;
  76         unsigned long flags;
  77
  78         /* FE state */
  79         offset += scnprintf(buf + offset, size - offset,
  80                            "[%s - %s]\n", fe->dai_link->name,
  81                            stream ? "Capture" : "Playback");
  82
  83         offset += scnprintf(buf + offset, size - offset, "State: %s\n",
  84                            dpcm_state_string(fe->dpcm[stream].state));
  85
  86         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
  87             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
  88                 offset += scnprintf(buf + offset, size - offset,
  89                                    "Hardware Params: "
  90                                    "Format = %s, Channels = %d, Rate = %d\n",
  91                                    snd_pcm_format_name(params_format(params)),
  92                                    params_channels(params),
  93                                    params_rate(params));
  94
  95         /* BEs state */
  96         offset += scnprintf(buf + offset, size - offset, "Backends:\n");
  97
  98         if (list_empty(&fe->dpcm[stream].be_clients)) {
  99                 offset += scnprintf(buf + offset, size - offset,
 100                                    " No active DSP links\n");
 101                 goto out;
 102         }
 103
 104         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
 105         for_each_dpcm_be(fe, stream, dpcm) {
 106                 struct snd_soc_pcm_runtime *be = dpcm->be;
 107                 params = &dpcm->hw_params;
 108
 109                 offset += scnprintf(buf + offset, size - offset,
 110                                    "- %s\n", be->dai_link->name);
 111
 112                 offset += scnprintf(buf + offset, size - offset,
 113                                    "   State: %s\n",
 114                                    dpcm_state_string(be->dpcm[stream].state));
 115
 116                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
 117                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
 118                         offset += scnprintf(buf + offset, size - offset,
 119                                            "   Hardware Params: "
 120                                            "Format = %s, Channels = %d, Rate = %d\n",
 121                                            snd_pcm_format_name(params_format(params)),
 122                                            params_channels(params),
 123                                            params_rate(params));
 124         }
 125         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
 126 out:
 127         return offset;
 128 }
 129
 130 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
 131                                     size_t count, loff_t *ppos)
 132 {
 133         struct snd_soc_pcm_runtime *fe = file->private_data;
 134         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
 135         int stream;
 136         char *buf;
 137
 138         if (fe->num_cpus > 1) {
 139                 dev_err(fe->dev,
 140                         "%s doesn't support Multi CPU yet\n", __func__);
 141                 return -EINVAL;
 142         }
 143
 144         buf = kmalloc(out_count, GFP_KERNEL);
 145         if (!buf)
 146                 return -ENOMEM;
 147
 148         for_each_pcm_streams(stream)
 149                 if (snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream))
 150                         offset += dpcm_show_state(fe, stream,
 151                                                   buf + offset,
 152                                                   out_count - offset);
 153
 154         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
 155
 156         kfree(buf);
 157         return ret;
 158 }
 159
 160 static const struct file_operations dpcm_state_fops = {
 161         .open = simple_open,
 162         .read = dpcm_state_read_file,
 163         .llseek = default_llseek,
 164 };
 165
 166 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
 167 {
 168         if (!rtd->dai_link->dynamic)
 169                 return;
 170
 171         if (!rtd->card->debugfs_card_root)
 172                 return;
 173
 174         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
 175                                                     rtd->card->debugfs_card_root);
 176
 177         debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
 178                             rtd, &dpcm_state_fops);
 179 }
 180
 181 static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream)
 182 {
 183         char *name;
 184
 185         name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name,
 186                          stream ? "capture" : "playback");
 187         if (name) {
 188                 dpcm->debugfs_state = debugfs_create_dir(
 189                         name, dpcm->fe->debugfs_dpcm_root);
 190                 debugfs_create_u32("state", 0644, dpcm->debugfs_state,
 191                                    &dpcm->state);
 192                 kfree(name);
 193         }
 194 }
 195
 196 static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 197 {
 198         debugfs_remove_recursive(dpcm->debugfs_state);
 199 }
 200
 201 #else
 202 static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
 203                                              int stream)
 204 {
 205 }
 206
 207 static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 208 {
 209 }
 210 #endif
 211
 212 /* Set FE's runtime_update state; the state is protected via PCM stream lock
 213  * for avoiding the race with trigger callback.
 214  * If the state is unset and a trigger is pending while the previous operation,
 215  * process the pending trigger action here.
 216  */
 217 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
 218 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
 219                                      int stream, enum snd_soc_dpcm_update state)
 220 {
 221         struct snd_pcm_substream *substream =
 222                 snd_soc_dpcm_get_substream(fe, stream);
 223
 224         snd_pcm_stream_lock_irq(substream);
 225         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
 226                 dpcm_fe_dai_do_trigger(substream,
 227                                        fe->dpcm[stream].trigger_pending - 1);
 228                 fe->dpcm[stream].trigger_pending = 0;
 229         }
 230         fe->dpcm[stream].runtime_update = state;
 231         snd_pcm_stream_unlock_irq(substream);
 232 }
 233
 234 static void dpcm_set_be_update_state(struct snd_soc_pcm_runtime *be,
 235                                      int stream, enum snd_soc_dpcm_update state)
 236 {
 237         be->dpcm[stream].runtime_update = state;
 238 }
 239
 240 /**
 241  * snd_soc_runtime_action() - Increment/Decrement active count for
 242  * PCM runtime components
 243  * @rtd: ASoC PCM runtime that is activated
 244  * @stream: Direction of the PCM stream
 245  * @action: Activate stream if 1. Deactivate if -1.
 246  *
 247  * Increments/Decrements the active count for all the DAIs and components
 248  * attached to a PCM runtime.
 249  * Should typically be called when a stream is opened.
 250  *
 251  * Must be called with the rtd->card->pcm_mutex being held
 252  */
 253 void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
 254                             int stream, int action)
 255 {
 256         struct snd_soc_dai *dai;
 257         int i;
 258
 259         lockdep_assert_held(&rtd->card->pcm_mutex);
 260
 261         for_each_rtd_dais(rtd, i, dai)
 262                 snd_soc_dai_action(dai, stream, action);
 263 }
 264 EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
 265
 266 /**
 267  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 268  * @rtd: The ASoC PCM runtime that should be checked.
 269  *
 270  * This function checks whether the power down delay should be ignored for a
 271  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 272  * been configured to ignore the delay, or if none of the components benefits
 273  * from having the delay.
 274  */
 275 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 276 {
 277         struct snd_soc_component *component;
 278         bool ignore = true;
 279         int i;
 280
 281         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 282                 return true;
 283
 284         for_each_rtd_components(rtd, i, component)
 285                 ignore &= !component->driver->use_pmdown_time;
 286
 287         return ignore;
 288 }
 289
 290 /**
 291  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 292  * @substream: the pcm substream
 293  * @hw: the hardware parameters
 294  *
 295  * Sets the substream runtime hardware parameters.
 296  */
 297 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 298         const struct snd_pcm_hardware *hw)
 299 {
 300         substream->runtime->hw = *hw;
 301
 302         return 0;
 303 }
 304 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 305
 306 /* DPCM stream event, send event to FE and all active BEs. */
 307 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 308         int event)
 309 {
 310         struct snd_soc_dpcm *dpcm;
 311
 312         for_each_dpcm_be(fe, dir, dpcm) {
 313
 314                 struct snd_soc_pcm_runtime *be = dpcm->be;
 315
 316                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 317                                 be->dai_link->name, event, dir);
 318
 319                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
 320                     (be->dpcm[dir].users >= 1))
 321                         continue;
 322
 323                 snd_soc_dapm_stream_event(be, dir, event);
 324         }
 325
 326         snd_soc_dapm_stream_event(fe, dir, event);
 327
 328         return 0;
 329 }
 330
 331 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
 332                                    struct snd_pcm_hw_params *params)
 333 {
 334         if (params) {
 335                 dai->rate        = params_rate(params);
 336                 dai->channels    = params_channels(params);
 337                 dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
 338         } else {
 339                 dai->rate        = 0;
 340                 dai->channels    = 0;
 341                 dai->sample_bits = 0;
 342         }
 343 }
 344
 345 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 346                                         struct snd_soc_dai *soc_dai)
 347 {
 348         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 349         int ret;
 350
 351         if (!snd_soc_dai_active(soc_dai))
 352                 return 0;
 353
 354 #define __soc_pcm_apply_symmetry(name, NAME)                            \
 355         if (soc_dai->name && (soc_dai->driver->symmetric_##name ||      \
 356                               rtd->dai_link->symmetric_##name)) {       \
 357                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
 358                         #name, soc_dai->name);                          \
 359                                                                         \
 360                 ret = snd_pcm_hw_constraint_single(substream->runtime,  \
 361                                                    SNDRV_PCM_HW_PARAM_##NAME,\
 362                                                    soc_dai->name);      \
 363                 if (ret < 0) {                                          \
 364                         dev_err(soc_dai->dev,                           \
 365                                 "ASoC: Unable to apply %s constraint: %d\n",\
 366                                 #name, ret);                            \
 367                         return ret;                                     \
 368                 }                                                       \
 369         }
 370
 371         __soc_pcm_apply_symmetry(rate,          RATE);
 372         __soc_pcm_apply_symmetry(channels,      CHANNELS);
 373         __soc_pcm_apply_symmetry(sample_bits,   SAMPLE_BITS);
 374
 375         return 0;
 376 }
 377
 378 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 379                                 struct snd_pcm_hw_params *params)
 380 {
 381         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 382         struct snd_soc_dai d;
 383         struct snd_soc_dai *dai;
 384         struct snd_soc_dai *cpu_dai;
 385         unsigned int symmetry, i;
 386
 387         soc_pcm_set_dai_params(&d, params);
 388
 389 #define __soc_pcm_params_symmetry(name)                                 \
 390         symmetry = rtd->dai_link->symmetric_##name;                     \
 391         for_each_rtd_dais(rtd, i, dai)                                  \
 392                 symmetry |= dai->driver->symmetric_##name;              \
 393                                                                         \
 394         if (symmetry)                                                   \
 395                 for_each_rtd_cpu_dais(rtd, i, cpu_dai)                  \
 396                         if (cpu_dai->name && cpu_dai->name != d.name) { \
 397                                 dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %d - %d\n", \
 398                                         #name, cpu_dai->name, d.name);  \
 399                                 return -EINVAL;                         \
 400                         }
 401
 402         /* reject unmatched parameters when applying symmetry */
 403         __soc_pcm_params_symmetry(rate);
 404         __soc_pcm_params_symmetry(channels);
 405         __soc_pcm_params_symmetry(sample_bits);
 406
 407         return 0;
 408 }
 409
 410 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
 411 {
 412         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 413         struct snd_soc_dai_link *link = rtd->dai_link;
 414         struct snd_soc_dai *dai;
 415         unsigned int symmetry, i;
 416
 417         symmetry = link->symmetric_rate ||
 418                 link->symmetric_channels ||
 419                 link->symmetric_sample_bits;
 420
 421         for_each_rtd_dais(rtd, i, dai)
 422                 symmetry = symmetry ||
 423                         dai->driver->symmetric_rate ||
 424                         dai->driver->symmetric_channels ||
 425                         dai->driver->symmetric_sample_bits;
 426
 427         if (symmetry)
 428                 substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 429 }
 430
 431 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 432 {
 433         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 434         int ret;
 435
 436         if (!bits)
 437                 return;
 438
 439         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 440         if (ret != 0)
 441                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 442                                  bits, ret);
 443 }
 444
 445 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 446 {
 447         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 448         struct snd_soc_dai *cpu_dai;
 449         struct snd_soc_dai *codec_dai;
 450         struct snd_soc_pcm_stream *pcm_codec, *pcm_cpu;
 451         int stream = substream->stream;
 452         int i;
 453         unsigned int bits = 0, cpu_bits = 0;
 454
 455         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 456                 pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 457
 458                 if (pcm_codec->sig_bits == 0) {
 459                         bits = 0;
 460                         break;
 461                 }
 462                 bits = max(pcm_codec->sig_bits, bits);
 463         }
 464
 465         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 466                 pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 467
 468                 if (pcm_cpu->sig_bits == 0) {
 469                         cpu_bits = 0;
 470                         break;
 471                 }
 472                 cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
 473         }
 474
 475         soc_pcm_set_msb(substream, bits);
 476         soc_pcm_set_msb(substream, cpu_bits);
 477 }
 478
 479 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
 480 {
 481         hw->rates               = UINT_MAX;
 482         hw->rate_min            = 0;
 483         hw->rate_max            = UINT_MAX;
 484         hw->channels_min        = 0;
 485         hw->channels_max        = UINT_MAX;
 486         hw->formats             = ULLONG_MAX;
 487 }
 488
 489 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
 490                                    struct snd_soc_pcm_stream *p)
 491 {
 492         hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
 493
 494         /* setup hw->rate_min/max via hw->rates first */
 495         snd_pcm_hw_limit_rates(hw);
 496
 497         /* update hw->rate_min/max by snd_soc_pcm_stream */
 498         hw->rate_min = max(hw->rate_min, p->rate_min);
 499         hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
 500 }
 501
 502 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
 503                                    struct snd_soc_pcm_stream *p)
 504 {
 505         hw->channels_min = max(hw->channels_min, p->channels_min);
 506         hw->channels_max = min(hw->channels_max, p->channels_max);
 507 }
 508
 509 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
 510                                      struct snd_soc_pcm_stream *p)
 511 {
 512         hw->formats &= p->formats;
 513 }
 514
 515 /**
 516  * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
 517  * @rtd: ASoC PCM runtime
 518  * @hw: PCM hardware parameters (output)
 519  * @stream: Direction of the PCM stream
 520  *
 521  * Calculates the subset of stream parameters supported by all DAIs
 522  * associated with the PCM stream.
 523  */
 524 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
 525                             struct snd_pcm_hardware *hw, int stream)
 526 {
 527         struct snd_soc_dai *codec_dai;
 528         struct snd_soc_dai *cpu_dai;
 529         struct snd_soc_pcm_stream *codec_stream;
 530         struct snd_soc_pcm_stream *cpu_stream;
 531         unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
 532         int i;
 533
 534         soc_pcm_hw_init(hw);
 535
 536         /* first calculate min/max only for CPUs in the DAI link */
 537         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 538
 539                 /*
 540                  * Skip CPUs which don't support the current stream type.
 541                  * Otherwise, since the rate, channel, and format values will
 542                  * zero in that case, we would have no usable settings left,
 543                  * causing the resulting setup to fail.
 544                  */
 545                 if (!snd_soc_dai_stream_valid(cpu_dai, stream))
 546                         continue;
 547
 548                 cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 549
 550                 soc_pcm_hw_update_chan(hw, cpu_stream);
 551                 soc_pcm_hw_update_rate(hw, cpu_stream);
 552                 soc_pcm_hw_update_format(hw, cpu_stream);
 553         }
 554         cpu_chan_min = hw->channels_min;
 555         cpu_chan_max = hw->channels_max;
 556
 557         /* second calculate min/max only for CODECs in the DAI link */
 558         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 559
 560                 /*
 561                  * Skip CODECs which don't support the current stream type.
 562                  * Otherwise, since the rate, channel, and format values will
 563                  * zero in that case, we would have no usable settings left,
 564                  * causing the resulting setup to fail.
 565                  */
 566                 if (!snd_soc_dai_stream_valid(codec_dai, stream))
 567                         continue;
 568
 569                 codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 570
 571                 soc_pcm_hw_update_chan(hw, codec_stream);
 572                 soc_pcm_hw_update_rate(hw, codec_stream);
 573                 soc_pcm_hw_update_format(hw, codec_stream);
 574         }
 575
 576         /* Verify both a valid CPU DAI and a valid CODEC DAI were found */
 577         if (!hw->channels_min)
 578                 return -EINVAL;
 579
 580         /*
 581          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 582          * connected to CPU DAI(s), use CPU DAI's directly and let
 583          * channel allocation be fixed up later
 584          */
 585         if (rtd->num_codecs > 1) {
 586                 hw->channels_min = cpu_chan_min;
 587                 hw->channels_max = cpu_chan_max;
 588         }
 589
 590         return 0;
 591 }
 592 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
 593
 594 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 595 {
 596         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 597         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 598         u64 formats = hw->formats;
 599
 600         /*
 601          * At least one CPU and one CODEC should match. Otherwise, we should
 602          * have bailed out on a higher level, since there would be no CPU or
 603          * CODEC to support the transfer direction in that case.
 604          */
 605         snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
 606
 607         if (formats)
 608                 hw->formats &= formats;
 609 }
 610
 611 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
 612 {
 613         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 614         struct snd_soc_component *component;
 615         int i, ret = 0;
 616
 617         for_each_rtd_components(rtd, i, component) {
 618                 ret = snd_soc_component_module_get_when_open(component, substream);
 619                 if (ret < 0)
 620                         break;
 621
 622                 ret = snd_soc_component_open(component, substream);
 623                 if (ret < 0)
 624                         break;
 625         }
 626
 627         return ret;
 628 }
 629
 630 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
 631                                     int rollback)
 632 {
 633         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 634         struct snd_soc_component *component;
 635         int i, r, ret = 0;
 636
 637         for_each_rtd_components(rtd, i, component) {
 638                 r = snd_soc_component_close(component, substream, rollback);
 639                 if (r < 0)
 640                         ret = r; /* use last ret */
 641
 642                 snd_soc_component_module_put_when_close(component, substream, rollback);
 643         }
 644
 645         return ret;
 646 }
 647
 648 static int soc_pcm_clean(struct snd_pcm_substream *substream, int rollback)
 649 {
 650         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 651         struct snd_soc_component *component;
 652         struct snd_soc_dai *dai;
 653         int i;
 654
 655         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 656
 657         if (!rollback)
 658                 snd_soc_runtime_deactivate(rtd, substream->stream);
 659
 660         for_each_rtd_dais(rtd, i, dai)
 661                 snd_soc_dai_shutdown(dai, substream, rollback);
 662
 663         snd_soc_link_shutdown(substream, rollback);
 664
 665         soc_pcm_components_close(substream, rollback);
 666
 667
 668         mutex_unlock(&rtd->card->pcm_mutex);
 669
 670         snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
 671
 672         for_each_rtd_components(rtd, i, component)
 673                 if (!snd_soc_component_active(component))
 674                         pinctrl_pm_select_sleep_state(component->dev);
 675
 676         return 0;
 677 }
 678
 679 /*
 680  * Called by ALSA when a PCM substream is closed. Private data can be
 681  * freed here. The cpu DAI, codec DAI, machine and components are also
 682  * shutdown.
 683  */
 684 static int soc_pcm_close(struct snd_pcm_substream *substream)
 685 {
 686         return soc_pcm_clean(substream, 0);
 687 }
 688
 689 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
 690 {
 691         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 692         struct snd_pcm_hardware *hw = &substream->runtime->hw;
 693         const char *name_cpu = soc_cpu_dai_name(rtd);
 694         const char *name_codec = soc_codec_dai_name(rtd);
 695         const char *err_msg;
 696         struct device *dev = rtd->dev;
 697
 698         err_msg = "rates";
 699         if (!hw->rates)
 700                 goto config_err;
 701
 702         err_msg = "formats";
 703         if (!hw->formats)
 704                 goto config_err;
 705
 706         err_msg = "channels";
 707         if (!hw->channels_min || !hw->channels_max ||
 708              hw->channels_min  >  hw->channels_max)
 709                 goto config_err;
 710
 711         dev_dbg(dev, "ASoC: %s <-> %s info:\n",         name_codec,
 712                                                         name_cpu);
 713         dev_dbg(dev, "ASoC: rate mask 0x%x\n",          hw->rates);
 714         dev_dbg(dev, "ASoC: ch   min %d max %d\n",      hw->channels_min,
 715                                                         hw->channels_max);
 716         dev_dbg(dev, "ASoC: rate min %d max %d\n",      hw->rate_min,
 717                                                         hw->rate_max);
 718
 719         return 0;
 720
 721 config_err:
 722         dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
 723                 name_codec, name_cpu, err_msg);
 724         return -EINVAL;
 725 }
 726
 727 /*
 728  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 729  * then initialized and any private data can be allocated. This also calls
 730  * startup for the cpu DAI, component, machine and codec DAI.
 731  */
 732 static int soc_pcm_open(struct snd_pcm_substream *substream)
 733 {
 734         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 735         struct snd_soc_component *component;
 736         struct snd_soc_dai *dai;
 737         int i, ret = 0;
 738
 739         for_each_rtd_components(rtd, i, component)
 740                 pinctrl_pm_select_default_state(component->dev);
 741
 742         ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
 743         if (ret < 0)
 744                 goto pm_err;
 745
 746         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 747
 748         ret = soc_pcm_components_open(substream);
 749         if (ret < 0)
 750                 goto err;
 751
 752         ret = snd_soc_link_startup(substream);
 753         if (ret < 0)
 754                 goto err;
 755
 756         /* startup the audio subsystem */
 757         for_each_rtd_dais(rtd, i, dai) {
 758                 ret = snd_soc_dai_startup(dai, substream);
 759                 if (ret < 0)
 760                         goto err;
 761
 762                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 763                         dai->tx_mask = 0;
 764                 else
 765                         dai->rx_mask = 0;
 766         }
 767
 768         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 769         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 770                 goto dynamic;
 771
 772         /* Check that the codec and cpu DAIs are compatible */
 773         soc_pcm_init_runtime_hw(substream);
 774
 775         soc_pcm_update_symmetry(substream);
 776
 777         ret = soc_hw_sanity_check(substream);
 778         if (ret < 0)
 779                 goto err;
 780
 781         soc_pcm_apply_msb(substream);
 782
 783         /* Symmetry only applies if we've already got an active stream. */
 784         for_each_rtd_dais(rtd, i, dai) {
 785                 ret = soc_pcm_apply_symmetry(substream, dai);
 786                 if (ret != 0)
 787                         goto err;
 788         }
 789 dynamic:
 790         snd_soc_runtime_activate(rtd, substream->stream);
 791         ret = 0;
 792 err:
 793         mutex_unlock(&rtd->card->pcm_mutex);
 794 pm_err:
 795         if (ret < 0) {
 796                 soc_pcm_clean(substream, 1);
 797                 dev_err(rtd->dev, "%s() failed (%d)", __func__, ret);
 798         }
 799
 800         return ret;
 801 }
 802
 803 static void codec2codec_close_delayed_work(struct snd_soc_pcm_runtime *rtd)
 804 {
 805         /*
 806          * Currently nothing to do for c2c links
 807          * Since c2c links are internal nodes in the DAPM graph and
 808          * don't interface with the outside world or application layer
 809          * we don't have to do any special handling on close.
 810          */
 811 }
 812
 813 /*
 814  * Called by ALSA when the PCM substream is prepared, can set format, sample
 815  * rate, etc.  This function is non atomic and can be called multiple times,
 816  * it can refer to the runtime info.
 817  */
 818 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 819 {
 820         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 821         struct snd_soc_dai *dai;
 822         int i, ret = 0;
 823
 824         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 825
 826         ret = snd_soc_link_prepare(substream);
 827         if (ret < 0)
 828                 goto out;
 829
 830         ret = snd_soc_pcm_component_prepare(substream);
 831         if (ret < 0)
 832                 goto out;
 833
 834         ret = snd_soc_pcm_dai_prepare(substream);
 835         if (ret < 0)
 836                 goto out;
 837
 838         /* cancel any delayed stream shutdown that is pending */
 839         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 840             rtd->pop_wait) {
 841                 rtd->pop_wait = 0;
 842                 cancel_delayed_work(&rtd->delayed_work);
 843         }
 844
 845         snd_soc_dapm_stream_event(rtd, substream->stream,
 846                         SND_SOC_DAPM_STREAM_START);
 847
 848         for_each_rtd_dais(rtd, i, dai)
 849                 snd_soc_dai_digital_mute(dai, 0, substream->stream);
 850
 851 out:
 852         mutex_unlock(&rtd->card->pcm_mutex);
 853
 854         if (ret < 0)
 855                 dev_err(rtd->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
 856
 857         return ret;
 858 }
 859
 860 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 861                                        unsigned int mask)
 862 {
 863         struct snd_interval *interval;
 864         int channels = hweight_long(mask);
 865
 866         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 867         interval->min = channels;
 868         interval->max = channels;
 869 }
 870
 871 static int soc_pcm_hw_clean(struct snd_pcm_substream *substream, int rollback)
 872 {
 873         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 874         struct snd_soc_dai *dai;
 875         int i;
 876
 877         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 878
 879         /* clear the corresponding DAIs parameters when going to be inactive */
 880         for_each_rtd_dais(rtd, i, dai) {
 881                 int active = snd_soc_dai_stream_active(dai, substream->stream);
 882
 883                 if (snd_soc_dai_active(dai) == 1)
 884                         soc_pcm_set_dai_params(dai, NULL);
 885
 886                 if (active == 1)
 887                         snd_soc_dai_digital_mute(dai, 1, substream->stream);
 888         }
 889
 890         /* run the stream event */
 891         snd_soc_dapm_stream_stop(rtd, substream->stream);
 892
 893         /* free any machine hw params */
 894         snd_soc_link_hw_free(substream, rollback);
 895
 896         /* free any component resources */
 897         snd_soc_pcm_component_hw_free(substream, rollback);
 898
 899         /* now free hw params for the DAIs  */
 900         for_each_rtd_dais(rtd, i, dai) {
 901                 if (!snd_soc_dai_stream_valid(dai, substream->stream))
 902                         continue;
 903
 904                 snd_soc_dai_hw_free(dai, substream, rollback);
 905         }
 906
 907         mutex_unlock(&rtd->card->pcm_mutex);
 908         return 0;
 909 }
 910
 911 /*
 912  * Frees resources allocated by hw_params, can be called multiple times
 913  */
 914 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 915 {
 916         return soc_pcm_hw_clean(substream, 0);
 917 }
 918
 919 /*
 920  * Called by ALSA when the hardware params are set by application. This
 921  * function can also be called multiple times and can allocate buffers
 922  * (using snd_pcm_lib_* ). It's non-atomic.
 923  */
 924 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 925                                 struct snd_pcm_hw_params *params)
 926 {
 927         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 928         struct snd_soc_dai *cpu_dai;
 929         struct snd_soc_dai *codec_dai;
 930         int i, ret = 0;
 931
 932         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 933
 934         ret = soc_pcm_params_symmetry(substream, params);
 935         if (ret)
 936                 goto out;
 937
 938         ret = snd_soc_link_hw_params(substream, params);
 939         if (ret < 0)
 940                 goto out;
 941
 942         for_each_rtd_codec_dais(rtd, i, codec_dai) {
 943                 struct snd_pcm_hw_params codec_params;
 944
 945                 /*
 946                  * Skip CODECs which don't support the current stream type,
 947                  * the idea being that if a CODEC is not used for the currently
 948                  * set up transfer direction, it should not need to be
 949                  * configured, especially since the configuration used might
 950                  * not even be supported by that CODEC. There may be cases
 951                  * however where a CODEC needs to be set up although it is
 952                  * actually not being used for the transfer, e.g. if a
 953                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
 954                  * for the DAI link including a playback-only CODEC.
 955                  * If this becomes necessary, we will have to augment the
 956                  * machine driver setup with information on how to act, so
 957                  * we can do the right thing here.
 958                  */
 959                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 960                         continue;
 961
 962                 /* copy params for each codec */
 963                 codec_params = *params;
 964
 965                 /* fixup params based on TDM slot masks */
 966                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 967                     codec_dai->tx_mask)
 968                         soc_pcm_codec_params_fixup(&codec_params,
 969                                                    codec_dai->tx_mask);
 970
 971                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
 972                     codec_dai->rx_mask)
 973                         soc_pcm_codec_params_fixup(&codec_params,
 974                                                    codec_dai->rx_mask);
 975
 976                 ret = snd_soc_dai_hw_params(codec_dai, substream,
 977                                             &codec_params);
 978                 if(ret < 0)
 979                         goto out;
 980
 981                 soc_pcm_set_dai_params(codec_dai, &codec_params);
 982                 snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
 983         }
 984
 985         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 986                 /*
 987                  * Skip CPUs which don't support the current stream
 988                  * type. See soc_pcm_init_runtime_hw() for more details
 989                  */
 990                 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
 991                         continue;
 992
 993                 ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
 994                 if (ret < 0)
 995                         goto out;
 996
 997                 /* store the parameters for each DAI */
 998                 soc_pcm_set_dai_params(cpu_dai, params);
 999                 snd_soc_dapm_update_dai(substream, params, cpu_dai);
1000         }
1001
1002         ret = snd_soc_pcm_component_hw_params(substream, params);
1003 out:
1004         mutex_unlock(&rtd->card->pcm_mutex);
1005
1006         if (ret < 0) {
1007                 soc_pcm_hw_clean(substream, 1);
1008                 dev_err(rtd->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
1009         }
1010
1011         return ret;
1012 }
1013
1014 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1015 {
1016         int ret = -EINVAL, _ret = 0;
1017         int rollback = 0;
1018
1019         switch (cmd) {
1020         case SNDRV_PCM_TRIGGER_START:
1021         case SNDRV_PCM_TRIGGER_RESUME:
1022         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1023                 ret = snd_soc_link_trigger(substream, cmd, 0);
1024                 if (ret < 0)
1025                         goto start_err;
1026
1027                 ret = snd_soc_pcm_component_trigger(substream, cmd, 0);
1028                 if (ret < 0)
1029                         goto start_err;
1030
1031                 ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
1032 start_err:
1033                 if (ret < 0)
1034                         rollback = 1;
1035         }
1036
1037         if (rollback) {
1038                 _ret = ret;
1039                 switch (cmd) {
1040                 case SNDRV_PCM_TRIGGER_START:
1041                         cmd = SNDRV_PCM_TRIGGER_STOP;
1042                         break;
1043                 case SNDRV_PCM_TRIGGER_RESUME:
1044                         cmd = SNDRV_PCM_TRIGGER_SUSPEND;
1045                         break;
1046                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1047                         cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
1048                         break;
1049                 }
1050         }
1051
1052         switch (cmd) {
1053         case SNDRV_PCM_TRIGGER_STOP:
1054         case SNDRV_PCM_TRIGGER_SUSPEND:
1055         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1056                 ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
1057                 if (ret < 0)
1058                         break;
1059
1060                 ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
1061                 if (ret < 0)
1062                         break;
1063
1064                 ret = snd_soc_link_trigger(substream, cmd, rollback);
1065                 break;
1066         }
1067
1068         if (_ret)
1069                 ret = _ret;
1070
1071         return ret;
1072 }
1073
1074 /*
1075  * soc level wrapper for pointer callback
1076  * If cpu_dai, codec_dai, component driver has the delay callback, then
1077  * the runtime->delay will be updated accordingly.
1078  */
1079 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1080 {
1081         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1082         struct snd_soc_dai *cpu_dai;
1083         struct snd_soc_dai *codec_dai;
1084         struct snd_pcm_runtime *runtime = substream->runtime;
1085         snd_pcm_uframes_t offset = 0;
1086         snd_pcm_sframes_t delay = 0;
1087         snd_pcm_sframes_t codec_delay = 0;
1088         snd_pcm_sframes_t cpu_delay = 0;
1089         int i;
1090
1091         /* clearing the previous total delay */
1092         runtime->delay = 0;
1093
1094         offset = snd_soc_pcm_component_pointer(substream);
1095
1096         /* base delay if assigned in pointer callback */
1097         delay = runtime->delay;
1098
1099         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1100                 cpu_delay = max(cpu_delay,
1101                                 snd_soc_dai_delay(cpu_dai, substream));
1102         }
1103         delay += cpu_delay;
1104
1105         for_each_rtd_codec_dais(rtd, i, codec_dai) {
1106                 codec_delay = max(codec_delay,
1107                                   snd_soc_dai_delay(codec_dai, substream));
1108         }
1109         delay += codec_delay;
1110
1111         runtime->delay = delay;
1112
1113         return offset;
1114 }
1115
1116 /* connect a FE and BE */
1117 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1118                 struct snd_soc_pcm_runtime *be, int stream)
1119 {
1120         struct snd_soc_dpcm *dpcm;
1121         unsigned long flags;
1122
1123         /* only add new dpcms */
1124         for_each_dpcm_be(fe, stream, dpcm) {
1125                 if (dpcm->be == be && dpcm->fe == fe)
1126                         return 0;
1127         }
1128
1129         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1130         if (!dpcm)
1131                 return -ENOMEM;
1132
1133         dpcm->be = be;
1134         dpcm->fe = fe;
1135         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1136         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1137         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1138         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1139         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1140         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1141
1142         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1143                         stream ? "capture" : "playback",  fe->dai_link->name,
1144                         stream ? "<-" : "->", be->dai_link->name);
1145
1146         dpcm_create_debugfs_state(dpcm, stream);
1147
1148         return 1;
1149 }
1150
1151 /* reparent a BE onto another FE */
1152 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1153                         struct snd_soc_pcm_runtime *be, int stream)
1154 {
1155         struct snd_soc_dpcm *dpcm;
1156         struct snd_pcm_substream *fe_substream, *be_substream;
1157
1158         /* reparent if BE is connected to other FEs */
1159         if (!be->dpcm[stream].users)
1160                 return;
1161
1162         be_substream = snd_soc_dpcm_get_substream(be, stream);
1163
1164         for_each_dpcm_fe(be, stream, dpcm) {
1165                 if (dpcm->fe == fe)
1166                         continue;
1167
1168                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1169                         stream ? "capture" : "playback",
1170                         dpcm->fe->dai_link->name,
1171                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1172
1173                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1174                 be_substream->runtime = fe_substream->runtime;
1175                 break;
1176         }
1177 }
1178
1179 /* disconnect a BE and FE */
1180 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1181 {
1182         struct snd_soc_dpcm *dpcm, *d;
1183         unsigned long flags;
1184
1185         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1186                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1187                                 stream ? "capture" : "playback",
1188                                 dpcm->be->dai_link->name);
1189
1190                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1191                         continue;
1192
1193                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1194                         stream ? "capture" : "playback", fe->dai_link->name,
1195                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1196
1197                 /* BEs still alive need new FE */
1198                 dpcm_be_reparent(fe, dpcm->be, stream);
1199
1200                 dpcm_remove_debugfs_state(dpcm);
1201
1202                 spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1203                 list_del(&dpcm->list_be);
1204                 list_del(&dpcm->list_fe);
1205                 spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1206                 kfree(dpcm);
1207         }
1208 }
1209
1210 /* get BE for DAI widget and stream */
1211 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1212                 struct snd_soc_dapm_widget *widget, int stream)
1213 {
1214         struct snd_soc_pcm_runtime *be;
1215         struct snd_soc_dapm_widget *w;
1216         struct snd_soc_dai *dai;
1217         int i;
1218
1219         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1220
1221         for_each_card_rtds(card, be) {
1222
1223                 if (!be->dai_link->no_pcm)
1224                         continue;
1225
1226                 for_each_rtd_dais(be, i, dai) {
1227                         w = snd_soc_dai_get_widget(dai, stream);
1228
1229                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1230                                 w ? w->name : "(not set)");
1231
1232                         if (w == widget)
1233                                 return be;
1234                 }
1235         }
1236
1237         /* Widget provided is not a BE */
1238         return NULL;
1239 }
1240
1241 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1242                 struct snd_soc_dapm_widget *widget)
1243 {
1244         struct snd_soc_dapm_widget *w;
1245         int i;
1246
1247         for_each_dapm_widgets(list, i, w)
1248                 if (widget == w)
1249                         return 1;
1250
1251         return 0;
1252 }
1253
1254 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1255                 enum snd_soc_dapm_direction dir)
1256 {
1257         struct snd_soc_card *card = widget->dapm->card;
1258         struct snd_soc_pcm_runtime *rtd;
1259         int stream;
1260
1261         /* adjust dir to stream */
1262         if (dir == SND_SOC_DAPM_DIR_OUT)
1263                 stream = SNDRV_PCM_STREAM_PLAYBACK;
1264         else
1265                 stream = SNDRV_PCM_STREAM_CAPTURE;
1266
1267         rtd = dpcm_get_be(card, widget, stream);
1268         if (rtd)
1269                 return true;
1270
1271         return false;
1272 }
1273
1274 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1275         int stream, struct snd_soc_dapm_widget_list **list)
1276 {
1277         struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
1278         int paths;
1279
1280         if (fe->num_cpus > 1) {
1281                 dev_err(fe->dev,
1282                         "%s doesn't support Multi CPU yet\n", __func__);
1283                 return -EINVAL;
1284         }
1285
1286         /* get number of valid DAI paths and their widgets */
1287         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1288                         fe->card->component_chaining ?
1289                                 NULL : dpcm_end_walk_at_be);
1290
1291         if (paths > 0)
1292                 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1293                         stream ? "capture" : "playback");
1294         else if (paths == 0)
1295                 dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
1296                          stream ? "capture" : "playback");
1297
1298         return paths;
1299 }
1300
1301 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1302 {
1303         snd_soc_dapm_dai_free_widgets(list);
1304 }
1305
1306 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1307                               struct snd_soc_dapm_widget_list *list)
1308 {
1309         struct snd_soc_dapm_widget *widget;
1310         struct snd_soc_dai *dai;
1311         unsigned int i;
1312
1313         /* is there a valid DAI widget for this BE */
1314         for_each_rtd_dais(dpcm->be, i, dai) {
1315                 widget = snd_soc_dai_get_widget(dai, stream);
1316
1317                 /*
1318                  * The BE is pruned only if none of the dai
1319                  * widgets are in the active list.
1320                  */
1321                 if (widget && widget_in_list(list, widget))
1322                         return true;
1323         }
1324
1325         return false;
1326 }
1327
1328 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1329                             struct snd_soc_dapm_widget_list **list_)
1330 {
1331         struct snd_soc_dpcm *dpcm;
1332         int prune = 0;
1333
1334         /* Destroy any old FE <--> BE connections */
1335         for_each_dpcm_be(fe, stream, dpcm) {
1336                 if (dpcm_be_is_active(dpcm, stream, *list_))
1337                         continue;
1338
1339                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1340                         stream ? "capture" : "playback",
1341                         dpcm->be->dai_link->name, fe->dai_link->name);
1342                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1343                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
1344                 prune++;
1345         }
1346
1347         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1348         return prune;
1349 }
1350
1351 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1352         struct snd_soc_dapm_widget_list **list_)
1353 {
1354         struct snd_soc_card *card = fe->card;
1355         struct snd_soc_dapm_widget_list *list = *list_;
1356         struct snd_soc_pcm_runtime *be;
1357         struct snd_soc_dapm_widget *widget;
1358         int i, new = 0, err;
1359
1360         /* Create any new FE <--> BE connections */
1361         for_each_dapm_widgets(list, i, widget) {
1362
1363                 switch (widget->id) {
1364                 case snd_soc_dapm_dai_in:
1365                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1366                                 continue;
1367                         break;
1368                 case snd_soc_dapm_dai_out:
1369                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1370                                 continue;
1371                         break;
1372                 default:
1373                         continue;
1374                 }
1375
1376                 /* is there a valid BE rtd for this widget */
1377                 be = dpcm_get_be(card, widget, stream);
1378                 if (!be) {
1379                         dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
1380                                 widget->name);
1381                         continue;
1382                 }
1383
1384                 /* don't connect if FE is not running */
1385                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1386                         continue;
1387
1388                 /* newly connected FE and BE */
1389                 err = dpcm_be_connect(fe, be, stream);
1390                 if (err < 0) {
1391                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1392                                 widget->name);
1393                         break;
1394                 } else if (err == 0) /* already connected */
1395                         continue;
1396
1397                 /* new */
1398                 dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
1399                 new++;
1400         }
1401
1402         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1403         return new;
1404 }
1405
1406 /*
1407  * Find the corresponding BE DAIs that source or sink audio to this
1408  * FE substream.
1409  */
1410 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1411         int stream, struct snd_soc_dapm_widget_list **list, int new)
1412 {
1413         if (new)
1414                 return dpcm_add_paths(fe, stream, list);
1415         else
1416                 return dpcm_prune_paths(fe, stream, list);
1417 }
1418
1419 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1420 {
1421         struct snd_soc_dpcm *dpcm;
1422         unsigned long flags;
1423
1424         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1425         for_each_dpcm_be(fe, stream, dpcm)
1426                 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
1427         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1428 }
1429
1430 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
1431                       int do_hw_free, struct snd_soc_dpcm *last)
1432 {
1433         struct snd_soc_dpcm *dpcm;
1434
1435         /* disable any enabled and non active backends */
1436         for_each_dpcm_be(fe, stream, dpcm) {
1437                 struct snd_soc_pcm_runtime *be = dpcm->be;
1438                 struct snd_pcm_substream *be_substream =
1439                         snd_soc_dpcm_get_substream(be, stream);
1440
1441                 if (dpcm == last)
1442                         return;
1443
1444                 /* is this op for this BE ? */
1445                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1446                         continue;
1447
1448                 if (be->dpcm[stream].users == 0) {
1449                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1450                                 stream ? "capture" : "playback",
1451                                 be->dpcm[stream].state);
1452                         continue;
1453                 }
1454
1455                 if (--be->dpcm[stream].users != 0)
1456                         continue;
1457
1458                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
1459                         if (!do_hw_free)
1460                                 continue;
1461
1462                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
1463                                 soc_pcm_hw_free(be_substream);
1464                                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1465                         }
1466                 }
1467
1468                 soc_pcm_close(be_substream);
1469                 be_substream->runtime = NULL;
1470                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1471         }
1472 }
1473
1474 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1475 {
1476         struct snd_soc_pcm_runtime *be;
1477         struct snd_soc_dpcm *dpcm;
1478         int err, count = 0;
1479
1480         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1481         for_each_dpcm_be(fe, stream, dpcm) {
1482                 struct snd_pcm_substream *be_substream;
1483
1484                 be = dpcm->be;
1485                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1486
1487                 if (!be_substream) {
1488                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1489                                 stream ? "capture" : "playback");
1490                         continue;
1491                 }
1492
1493                 /* is this op for this BE ? */
1494                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1495                         continue;
1496
1497                 /* first time the dpcm is open ? */
1498                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
1499                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1500                                 stream ? "capture" : "playback",
1501                                 be->dpcm[stream].state);
1502                         continue;
1503                 }
1504
1505                 if (be->dpcm[stream].users++ != 0)
1506                         continue;
1507
1508                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1509                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1510                         continue;
1511
1512                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1513                         stream ? "capture" : "playback", be->dai_link->name);
1514
1515                 be_substream->runtime = be->dpcm[stream].runtime;
1516                 err = soc_pcm_open(be_substream);
1517                 if (err < 0) {
1518                         be->dpcm[stream].users--;
1519                         if (be->dpcm[stream].users < 0)
1520                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1521                                         stream ? "capture" : "playback",
1522                                         be->dpcm[stream].state);
1523
1524                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1525                         goto unwind;
1526                 }
1527
1528                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1529                 count++;
1530         }
1531
1532         return count;
1533
1534 unwind:
1535         dpcm_be_dai_startup_rollback(fe, stream, dpcm);
1536
1537         dev_err(fe->dev, "ASoC: %s() failed at %s (%d)\n",
1538                 __func__, be->dai_link->name, err);
1539
1540         return err;
1541 }
1542
1543 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
1544 {
1545         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1546         struct snd_pcm_runtime *runtime = substream->runtime;
1547         struct snd_pcm_hardware *hw = &runtime->hw;
1548         struct snd_soc_dai *dai;
1549         int stream = substream->stream;
1550         int i;
1551
1552         soc_pcm_hw_init(hw);
1553
1554         for_each_rtd_cpu_dais(fe, i, dai) {
1555                 struct snd_soc_pcm_stream *cpu_stream;
1556
1557                 /*
1558                  * Skip CPUs which don't support the current stream
1559                  * type. See soc_pcm_init_runtime_hw() for more details
1560                  */
1561                 if (!snd_soc_dai_stream_valid(dai, stream))
1562                         continue;
1563
1564                 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1565
1566                 soc_pcm_hw_update_rate(hw, cpu_stream);
1567                 soc_pcm_hw_update_chan(hw, cpu_stream);
1568                 soc_pcm_hw_update_format(hw, cpu_stream);
1569         }
1570
1571 }
1572
1573 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
1574 {
1575         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1576         struct snd_pcm_runtime *runtime = substream->runtime;
1577         struct snd_pcm_hardware *hw = &runtime->hw;
1578         struct snd_soc_dpcm *dpcm;
1579         struct snd_soc_dai *dai;
1580         int stream = substream->stream;
1581
1582         if (!fe->dai_link->dpcm_merged_format)
1583                 return;
1584
1585         /*
1586          * It returns merged BE codec format
1587          * if FE want to use it (= dpcm_merged_format)
1588          */
1589
1590         for_each_dpcm_be(fe, stream, dpcm) {
1591                 struct snd_soc_pcm_runtime *be = dpcm->be;
1592                 struct snd_soc_pcm_stream *codec_stream;
1593                 int i;
1594
1595                 for_each_rtd_codec_dais(be, i, dai) {
1596                         /*
1597                          * Skip CODECs which don't support the current stream
1598                          * type. See soc_pcm_init_runtime_hw() for more details
1599                          */
1600                         if (!snd_soc_dai_stream_valid(dai, stream))
1601                                 continue;
1602
1603                         codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1604
1605                         soc_pcm_hw_update_format(hw, codec_stream);
1606                 }
1607         }
1608 }
1609
1610 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
1611 {
1612         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1613         struct snd_pcm_runtime *runtime = substream->runtime;
1614         struct snd_pcm_hardware *hw = &runtime->hw;
1615         struct snd_soc_dpcm *dpcm;
1616         int stream = substream->stream;
1617
1618         if (!fe->dai_link->dpcm_merged_chan)
1619                 return;
1620
1621         /*
1622          * It returns merged BE codec channel;
1623          * if FE want to use it (= dpcm_merged_chan)
1624          */
1625
1626         for_each_dpcm_be(fe, stream, dpcm) {
1627                 struct snd_soc_pcm_runtime *be = dpcm->be;
1628                 struct snd_soc_pcm_stream *codec_stream;
1629                 struct snd_soc_pcm_stream *cpu_stream;
1630                 struct snd_soc_dai *dai;
1631                 int i;
1632
1633                 for_each_rtd_cpu_dais(be, i, dai) {
1634                         /*
1635                          * Skip CPUs which don't support the current stream
1636                          * type. See soc_pcm_init_runtime_hw() for more details
1637                          */
1638                         if (!snd_soc_dai_stream_valid(dai, stream))
1639                                 continue;
1640
1641                         cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1642
1643                         soc_pcm_hw_update_chan(hw, cpu_stream);
1644                 }
1645
1646                 /*
1647                  * chan min/max cannot be enforced if there are multiple CODEC
1648                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1649                  */
1650                 if (be->num_codecs == 1) {
1651                         codec_stream = snd_soc_dai_get_pcm_stream(asoc_rtd_to_codec(be, 0), stream);
1652
1653                         soc_pcm_hw_update_chan(hw, codec_stream);
1654                 }
1655         }
1656 }
1657
1658 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
1659 {
1660         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1661         struct snd_pcm_runtime *runtime = substream->runtime;
1662         struct snd_pcm_hardware *hw = &runtime->hw;
1663         struct snd_soc_dpcm *dpcm;
1664         int stream = substream->stream;
1665
1666         if (!fe->dai_link->dpcm_merged_rate)
1667                 return;
1668
1669         /*
1670          * It returns merged BE codec channel;
1671          * if FE want to use it (= dpcm_merged_chan)
1672          */
1673
1674         for_each_dpcm_be(fe, stream, dpcm) {
1675                 struct snd_soc_pcm_runtime *be = dpcm->be;
1676                 struct snd_soc_pcm_stream *pcm;
1677                 struct snd_soc_dai *dai;
1678                 int i;
1679
1680                 for_each_rtd_dais(be, i, dai) {
1681                         /*
1682                          * Skip DAIs which don't support the current stream
1683                          * type. See soc_pcm_init_runtime_hw() for more details
1684                          */
1685                         if (!snd_soc_dai_stream_valid(dai, stream))
1686                                 continue;
1687
1688                         pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1689
1690                         soc_pcm_hw_update_rate(hw, pcm);
1691                 }
1692         }
1693 }
1694
1695 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1696                                int stream)
1697 {
1698         struct snd_soc_dpcm *dpcm;
1699         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1700         struct snd_soc_dai *fe_cpu_dai;
1701         int err;
1702         int i;
1703
1704         /* apply symmetry for FE */
1705         soc_pcm_update_symmetry(fe_substream);
1706
1707         for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1708                 /* Symmetry only applies if we've got an active stream. */
1709                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1710                 if (err < 0)
1711                         goto error;
1712         }
1713
1714         /* apply symmetry for BE */
1715         for_each_dpcm_be(fe, stream, dpcm) {
1716                 struct snd_soc_pcm_runtime *be = dpcm->be;
1717                 struct snd_pcm_substream *be_substream =
1718                         snd_soc_dpcm_get_substream(be, stream);
1719                 struct snd_soc_pcm_runtime *rtd;
1720                 struct snd_soc_dai *dai;
1721
1722                 /* A backend may not have the requested substream */
1723                 if (!be_substream)
1724                         continue;
1725
1726                 rtd = asoc_substream_to_rtd(be_substream);
1727                 if (rtd->dai_link->be_hw_params_fixup)
1728                         continue;
1729
1730                 soc_pcm_update_symmetry(be_substream);
1731
1732                 /* Symmetry only applies if we've got an active stream. */
1733                 for_each_rtd_dais(rtd, i, dai) {
1734                         err = soc_pcm_apply_symmetry(fe_substream, dai);
1735                         if (err < 0)
1736                                 goto error;
1737                 }
1738         }
1739 error:
1740         if (err < 0)
1741                 dev_err(fe->dev, "ASoC: %s failed (%d)\n", __func__, err);
1742
1743         return err;
1744 }
1745
1746 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1747 {
1748         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1749         int stream = fe_substream->stream, ret = 0;
1750
1751         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1752
1753         ret = dpcm_be_dai_startup(fe, stream);
1754         if (ret < 0)
1755                 goto be_err;
1756
1757         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1758
1759         /* start the DAI frontend */
1760         ret = soc_pcm_open(fe_substream);
1761         if (ret < 0)
1762                 goto unwind;
1763
1764         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1765
1766         dpcm_runtime_setup_fe(fe_substream);
1767
1768         dpcm_runtime_setup_be_format(fe_substream);
1769         dpcm_runtime_setup_be_chan(fe_substream);
1770         dpcm_runtime_setup_be_rate(fe_substream);
1771
1772         ret = dpcm_apply_symmetry(fe_substream, stream);
1773
1774 unwind:
1775         if (ret < 0)
1776                 dpcm_be_dai_startup_unwind(fe, stream);
1777 be_err:
1778         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1779
1780         if (ret < 0)
1781                 dev_err(fe->dev, "%s() failed (%d)\n", __func__, ret);
1782
1783         return ret;
1784 }
1785
1786 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1787 {
1788         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1789         int stream = substream->stream;
1790
1791         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1792
1793         /* shutdown the BEs */
1794         dpcm_be_dai_shutdown(fe, stream);
1795
1796         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1797
1798         /* now shutdown the frontend */
1799         soc_pcm_close(substream);
1800
1801         /* run the stream stop event */
1802         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1803
1804         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1805         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1806         return 0;
1807 }
1808
1809 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1810 {
1811         struct snd_soc_dpcm *dpcm;
1812
1813         /* only hw_params backends that are either sinks or sources
1814          * to this frontend DAI */
1815         for_each_dpcm_be(fe, stream, dpcm) {
1816
1817                 struct snd_soc_pcm_runtime *be = dpcm->be;
1818                 struct snd_pcm_substream *be_substream =
1819                         snd_soc_dpcm_get_substream(be, stream);
1820
1821                 /* is this op for this BE ? */
1822                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1823                         continue;
1824
1825                 /* only free hw when no longer used - check all FEs */
1826                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1827                                 continue;
1828
1829                 /* do not free hw if this BE is used by other FE */
1830                 if (be->dpcm[stream].users > 1)
1831                         continue;
1832
1833                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1834                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1835                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1836                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1837                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1838                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1839                         continue;
1840
1841                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1842                         be->dai_link->name);
1843
1844                 soc_pcm_hw_free(be_substream);
1845
1846                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1847         }
1848 }
1849
1850 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1851 {
1852         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1853         int stream = substream->stream;
1854
1855         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1856         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1857
1858         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1859
1860         /* call hw_free on the frontend */
1861         soc_pcm_hw_free(substream);
1862
1863         /* only hw_params backends that are either sinks or sources
1864          * to this frontend DAI */
1865         dpcm_be_dai_hw_free(fe, stream);
1866
1867         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1868         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1869
1870         mutex_unlock(&fe->card->mutex);
1871         return 0;
1872 }
1873
1874 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1875 {
1876         struct snd_soc_pcm_runtime *be;
1877         struct snd_pcm_substream *be_substream;
1878         struct snd_soc_dpcm *dpcm;
1879         int ret;
1880
1881         for_each_dpcm_be(fe, stream, dpcm) {
1882                 be = dpcm->be;
1883                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1884
1885                 /* is this op for this BE ? */
1886                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1887                         continue;
1888
1889                 /* copy params for each dpcm */
1890                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1891                                 sizeof(struct snd_pcm_hw_params));
1892
1893                 /* perform any hw_params fixups */
1894                 ret = snd_soc_link_be_hw_params_fixup(be, &dpcm->hw_params);
1895                 if (ret < 0)
1896                         goto unwind;
1897
1898                 /* copy the fixed-up hw params for BE dai */
1899                 memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
1900                        sizeof(struct snd_pcm_hw_params));
1901
1902                 /* only allow hw_params() if no connected FEs are running */
1903                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1904                         continue;
1905
1906                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1907                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1908                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1909                         continue;
1910
1911                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1912                         be->dai_link->name);
1913
1914                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1915                 if (ret < 0)
1916                         goto unwind;
1917
1918                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1919         }
1920         return 0;
1921
1922 unwind:
1923         dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
1924                 __func__, be->dai_link->name, ret);
1925
1926         /* disable any enabled and non active backends */
1927         for_each_dpcm_be_rollback(fe, stream, dpcm) {
1928                 be = dpcm->be;
1929                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1930
1931                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1932                         continue;
1933
1934                 /* only allow hw_free() if no connected FEs are running */
1935                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1936                         continue;
1937
1938                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1939                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1940                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1941                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1942                         continue;
1943
1944                 soc_pcm_hw_free(be_substream);
1945         }
1946
1947         return ret;
1948 }
1949
1950 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1951                                  struct snd_pcm_hw_params *params)
1952 {
1953         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1954         int ret, stream = substream->stream;
1955
1956         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1957         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1958
1959         memcpy(&fe->dpcm[stream].hw_params, params,
1960                         sizeof(struct snd_pcm_hw_params));
1961         ret = dpcm_be_dai_hw_params(fe, stream);
1962         if (ret < 0)
1963                 goto out;
1964
1965         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1966                         fe->dai_link->name, params_rate(params),
1967                         params_channels(params), params_format(params));
1968
1969         /* call hw_params on the frontend */
1970         ret = soc_pcm_hw_params(substream, params);
1971         if (ret < 0)
1972                 dpcm_be_dai_hw_free(fe, stream);
1973         else
1974                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1975
1976 out:
1977         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1978         mutex_unlock(&fe->card->mutex);
1979
1980         if (ret < 0)
1981                 dev_err(fe->dev, "ASoC: %s failed (%d)\n", __func__, ret);
1982
1983         return ret;
1984 }
1985
1986 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1987                                int cmd)
1988 {
1989         struct snd_soc_pcm_runtime *be;
1990         struct snd_soc_dpcm *dpcm;
1991         int ret = 0;
1992
1993         for_each_dpcm_be(fe, stream, dpcm) {
1994                 struct snd_pcm_substream *be_substream;
1995
1996                 be = dpcm->be;
1997                 be_substream = snd_soc_dpcm_get_substream(be, stream);
1998
1999                 /* is this op for this BE ? */
2000                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2001                         continue;
2002
2003                 dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
2004                         be->dai_link->name, cmd);
2005
2006                 switch (cmd) {
2007                 case SNDRV_PCM_TRIGGER_START:
2008                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2009                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2010                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2011                                 continue;
2012
2013                         ret = soc_pcm_trigger(be_substream, cmd);
2014                         if (ret)
2015                                 goto end;
2016
2017                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2018                         break;
2019                 case SNDRV_PCM_TRIGGER_RESUME:
2020                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2021                                 continue;
2022
2023                         ret = soc_pcm_trigger(be_substream, cmd);
2024                         if (ret)
2025                                 goto end;
2026
2027                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2028                         break;
2029                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2030                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2031                                 continue;
2032
2033                         ret = soc_pcm_trigger(be_substream, cmd);
2034                         if (ret)
2035                                 goto end;
2036
2037                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2038                         break;
2039                 case SNDRV_PCM_TRIGGER_STOP:
2040                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2041                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2042                                 continue;
2043
2044                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2045                                 continue;
2046
2047                         ret = soc_pcm_trigger(be_substream, cmd);
2048                         if (ret)
2049                                 goto end;
2050
2051                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2052                         break;
2053                 case SNDRV_PCM_TRIGGER_SUSPEND:
2054                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2055                                 continue;
2056
2057                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2058                                 continue;
2059
2060                         ret = soc_pcm_trigger(be_substream, cmd);
2061                         if (ret)
2062                                 goto end;
2063
2064                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2065                         break;
2066                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2067                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2068                                 continue;
2069
2070                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2071                                 continue;
2072
2073                         ret = soc_pcm_trigger(be_substream, cmd);
2074                         if (ret)
2075                                 goto end;
2076
2077                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2078                         break;
2079                 }
2080         }
2081 end:
2082         if (ret < 0)
2083                 dev_err(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2084                         __func__, be->dai_link->name, ret);
2085         return ret;
2086 }
2087 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2088
2089 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2090                                   int cmd, bool fe_first)
2091 {
2092         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2093         int ret;
2094
2095         /* call trigger on the frontend before the backend. */
2096         if (fe_first) {
2097                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2098                         fe->dai_link->name, cmd);
2099
2100                 ret = soc_pcm_trigger(substream, cmd);
2101                 if (ret < 0)
2102                         return ret;
2103
2104                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2105                 return ret;
2106         }
2107
2108         /* call trigger on the frontend after the backend. */
2109         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2110         if (ret < 0)
2111                 return ret;
2112
2113         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2114                 fe->dai_link->name, cmd);
2115
2116         ret = soc_pcm_trigger(substream, cmd);
2117
2118         return ret;
2119 }
2120
2121 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2122 {
2123         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2124         int stream = substream->stream;
2125         int ret = 0;
2126         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2127
2128         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2129
2130         switch (trigger) {
2131         case SND_SOC_DPCM_TRIGGER_PRE:
2132                 switch (cmd) {
2133                 case SNDRV_PCM_TRIGGER_START:
2134                 case SNDRV_PCM_TRIGGER_RESUME:
2135                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2136                 case SNDRV_PCM_TRIGGER_DRAIN:
2137                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2138                         break;
2139                 case SNDRV_PCM_TRIGGER_STOP:
2140                 case SNDRV_PCM_TRIGGER_SUSPEND:
2141                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2142                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2143                         break;
2144                 default:
2145                         ret = -EINVAL;
2146                         break;
2147                 }
2148                 break;
2149         case SND_SOC_DPCM_TRIGGER_POST:
2150                 switch (cmd) {
2151                 case SNDRV_PCM_TRIGGER_START:
2152                 case SNDRV_PCM_TRIGGER_RESUME:
2153                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2154                 case SNDRV_PCM_TRIGGER_DRAIN:
2155                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2156                         break;
2157                 case SNDRV_PCM_TRIGGER_STOP:
2158                 case SNDRV_PCM_TRIGGER_SUSPEND:
2159                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2160                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2161                         break;
2162                 default:
2163                         ret = -EINVAL;
2164                         break;
2165                 }
2166                 break;
2167         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2168                 /* bespoke trigger() - handles both FE and BEs */
2169
2170                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2171                                 fe->dai_link->name, cmd);
2172
2173                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2174                 break;
2175         default:
2176                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2177                                 fe->dai_link->name);
2178                 ret = -EINVAL;
2179                 goto out;
2180         }
2181
2182         if (ret < 0) {
2183                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2184                         cmd, ret);
2185                 goto out;
2186         }
2187
2188         switch (cmd) {
2189         case SNDRV_PCM_TRIGGER_START:
2190         case SNDRV_PCM_TRIGGER_RESUME:
2191         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2192                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2193                 break;
2194         case SNDRV_PCM_TRIGGER_STOP:
2195         case SNDRV_PCM_TRIGGER_SUSPEND:
2196                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2197                 break;
2198         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2199                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2200                 break;
2201         }
2202
2203 out:
2204         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2205         return ret;
2206 }
2207
2208 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2209 {
2210         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2211         int stream = substream->stream;
2212
2213         /* if FE's runtime_update is already set, we're in race;
2214          * process this trigger later at exit
2215          */
2216         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2217                 fe->dpcm[stream].trigger_pending = cmd + 1;
2218                 return 0; /* delayed, assuming it's successful */
2219         }
2220
2221         /* we're alone, let's trigger */
2222         return dpcm_fe_dai_do_trigger(substream, cmd);
2223 }
2224
2225 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2226 {
2227         struct snd_soc_dpcm *dpcm;
2228         int ret = 0;
2229
2230         for_each_dpcm_be(fe, stream, dpcm) {
2231
2232                 struct snd_soc_pcm_runtime *be = dpcm->be;
2233                 struct snd_pcm_substream *be_substream =
2234                         snd_soc_dpcm_get_substream(be, stream);
2235
2236                 /* is this op for this BE ? */
2237                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2238                         continue;
2239
2240                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2241                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2242                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2243                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2244                         continue;
2245
2246                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2247                         be->dai_link->name);
2248
2249                 ret = soc_pcm_prepare(be_substream);
2250                 if (ret < 0)
2251                         break;
2252
2253                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2254         }
2255
2256         if (ret < 0)
2257                 dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
2258
2259         return ret;
2260 }
2261
2262 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2263 {
2264         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2265         int stream = substream->stream, ret = 0;
2266
2267         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2268
2269         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2270
2271         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2272
2273         /* there is no point preparing this FE if there are no BEs */
2274         if (list_empty(&fe->dpcm[stream].be_clients)) {
2275                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2276                                 fe->dai_link->name);
2277                 ret = -EINVAL;
2278                 goto out;
2279         }
2280
2281         ret = dpcm_be_dai_prepare(fe, stream);
2282         if (ret < 0)
2283                 goto out;
2284
2285         /* call prepare on the frontend */
2286         ret = soc_pcm_prepare(substream);
2287         if (ret < 0)
2288                 goto out;
2289
2290         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2291
2292 out:
2293         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2294         mutex_unlock(&fe->card->mutex);
2295
2296         if (ret < 0)
2297                 dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
2298
2299         return ret;
2300 }
2301
2302 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2303 {
2304         struct snd_pcm_substream *substream =
2305                 snd_soc_dpcm_get_substream(fe, stream);
2306         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2307         int err;
2308
2309         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2310                         stream ? "capture" : "playback", fe->dai_link->name);
2311
2312         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2313                 /* call bespoke trigger - FE takes care of all BE triggers */
2314                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2315                                 fe->dai_link->name);
2316
2317                 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2318         } else {
2319                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2320                         fe->dai_link->name);
2321
2322                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2323         }
2324
2325         dpcm_be_dai_hw_free(fe, stream);
2326
2327         dpcm_be_dai_shutdown(fe, stream);
2328
2329         /* run the stream event for each BE */
2330         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2331
2332         if (err < 0)
2333                 dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, err);
2334
2335         return err;
2336 }
2337
2338 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2339 {
2340         struct snd_pcm_substream *substream =
2341                 snd_soc_dpcm_get_substream(fe, stream);
2342         struct snd_soc_dpcm *dpcm;
2343         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2344         int ret = 0;
2345         unsigned long flags;
2346
2347         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2348                         stream ? "capture" : "playback", fe->dai_link->name);
2349
2350         /* Only start the BE if the FE is ready */
2351         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2352                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
2353                 dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
2354                         fe->dai_link->name, fe->dpcm[stream].state);
2355                 ret = -EINVAL;
2356                 goto disconnect;
2357         }
2358
2359         /* startup must always be called for new BEs */
2360         ret = dpcm_be_dai_startup(fe, stream);
2361         if (ret < 0)
2362                 goto disconnect;
2363
2364         /* keep going if FE state is > open */
2365         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2366                 return 0;
2367
2368         ret = dpcm_be_dai_hw_params(fe, stream);
2369         if (ret < 0)
2370                 goto close;
2371
2372         /* keep going if FE state is > hw_params */
2373         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2374                 return 0;
2375
2376         ret = dpcm_be_dai_prepare(fe, stream);
2377         if (ret < 0)
2378                 goto hw_free;
2379
2380         /* run the stream event for each BE */
2381         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2382
2383         /* keep going if FE state is > prepare */
2384         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2385                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2386                 return 0;
2387
2388         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2389                 /* call trigger on the frontend - FE takes care of all BE triggers */
2390                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2391                                 fe->dai_link->name);
2392
2393                 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2394                 if (ret < 0)
2395                         goto hw_free;
2396         } else {
2397                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2398                         fe->dai_link->name);
2399
2400                 ret = dpcm_be_dai_trigger(fe, stream,
2401                                         SNDRV_PCM_TRIGGER_START);
2402                 if (ret < 0)
2403                         goto hw_free;
2404         }
2405
2406         return 0;
2407
2408 hw_free:
2409         dpcm_be_dai_hw_free(fe, stream);
2410 close:
2411         dpcm_be_dai_shutdown(fe, stream);
2412 disconnect:
2413         /* disconnect any pending BEs */
2414         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
2415         for_each_dpcm_be(fe, stream, dpcm) {
2416                 struct snd_soc_pcm_runtime *be = dpcm->be;
2417
2418                 /* is this op for this BE ? */
2419                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2420                         continue;
2421
2422                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
2423                         be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
2424                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2425         }
2426         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
2427
2428         if (ret < 0)
2429                 dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
2430
2431         return ret;
2432 }
2433
2434 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2435 {
2436         struct snd_soc_dapm_widget_list *list;
2437         int stream;
2438         int count, paths;
2439
2440         if (!fe->dai_link->dynamic)
2441                 return 0;
2442
2443         if (fe->num_cpus > 1) {
2444                 dev_err(fe->dev,
2445                         "%s doesn't support Multi CPU yet\n", __func__);
2446                 return -EINVAL;
2447         }
2448
2449         /* only check active links */
2450         if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
2451                 return 0;
2452
2453         /* DAPM sync will call this to update DSP paths */
2454         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2455                 new ? "new" : "old", fe->dai_link->name);
2456
2457         for_each_pcm_streams(stream) {
2458
2459                 /* skip if FE doesn't have playback/capture capability */
2460                 if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
2461                     !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
2462                         continue;
2463
2464                 /* skip if FE isn't currently playing/capturing */
2465                 if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
2466                     !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
2467                         continue;
2468
2469                 paths = dpcm_path_get(fe, stream, &list);
2470                 if (paths < 0)
2471                         return paths;
2472
2473                 /* update any playback/capture paths */
2474                 count = dpcm_process_paths(fe, stream, &list, new);
2475                 if (count) {
2476                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2477                         if (new)
2478                                 dpcm_run_update_startup(fe, stream);
2479                         else
2480                                 dpcm_run_update_shutdown(fe, stream);
2481                         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2482
2483                         dpcm_clear_pending_state(fe, stream);
2484                         dpcm_be_disconnect(fe, stream);
2485                 }
2486
2487                 dpcm_path_put(&list);
2488         }
2489
2490         return 0;
2491 }
2492
2493 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2494  * any DAI links.
2495  */
2496 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2497 {
2498         struct snd_soc_pcm_runtime *fe;
2499         int ret = 0;
2500
2501         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2502         /* shutdown all old paths first */
2503         for_each_card_rtds(card, fe) {
2504                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2505                 if (ret)
2506                         goto out;
2507         }
2508
2509         /* bring new paths up */
2510         for_each_card_rtds(card, fe) {
2511                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2512                 if (ret)
2513                         goto out;
2514         }
2515
2516 out:
2517         mutex_unlock(&card->mutex);
2518         return ret;
2519 }
2520 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2521
2522 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2523 {
2524         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2525         struct snd_soc_dpcm *dpcm;
2526         int stream = fe_substream->stream;
2527
2528         /* mark FE's links ready to prune */
2529         for_each_dpcm_be(fe, stream, dpcm)
2530                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2531
2532         dpcm_be_disconnect(fe, stream);
2533
2534         fe->dpcm[stream].runtime = NULL;
2535 }
2536
2537 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2538 {
2539         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2540         int ret;
2541
2542         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2543         ret = dpcm_fe_dai_shutdown(fe_substream);
2544
2545         dpcm_fe_dai_cleanup(fe_substream);
2546
2547         mutex_unlock(&fe->card->mutex);
2548         return ret;
2549 }
2550
2551 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2552 {
2553         struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2554         struct snd_soc_dapm_widget_list *list;
2555         int ret;
2556         int stream = fe_substream->stream;
2557
2558         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2559         fe->dpcm[stream].runtime = fe_substream->runtime;
2560
2561         ret = dpcm_path_get(fe, stream, &list);
2562         if (ret < 0)
2563                 goto open_end;
2564
2565         /* calculate valid and active FE <-> BE dpcms */
2566         dpcm_process_paths(fe, stream, &list, 1);
2567
2568         ret = dpcm_fe_dai_startup(fe_substream);
2569         if (ret < 0)
2570                 dpcm_fe_dai_cleanup(fe_substream);
2571
2572         dpcm_clear_pending_state(fe, stream);
2573         dpcm_path_put(&list);
2574 open_end:
2575         mutex_unlock(&fe->card->mutex);
2576         return ret;
2577 }
2578
2579 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
2580                                     int *playback, int *capture)
2581 {
2582         struct snd_soc_dai *codec_dai;
2583         struct snd_soc_dai *cpu_dai;
2584         int stream;
2585         int i;
2586
2587         if (rtd->dai_link->dynamic && rtd->num_cpus > 1) {
2588                 dev_err(rtd->dev,
2589                         "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2590                 return -EINVAL;
2591         }
2592
2593         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2594                 if (rtd->dai_link->dpcm_playback) {
2595                         stream = SNDRV_PCM_STREAM_PLAYBACK;
2596
2597                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2598                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2599                                         *playback = 1;
2600                                         break;
2601                                 }
2602                         }
2603                         if (!*playback) {
2604                                 dev_err(rtd->card->dev,
2605                                         "No CPU DAIs support playback for stream %s\n",
2606                                         rtd->dai_link->stream_name);
2607                                 return -EINVAL;
2608                         }
2609                 }
2610                 if (rtd->dai_link->dpcm_capture) {
2611                         stream = SNDRV_PCM_STREAM_CAPTURE;
2612
2613                         for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2614                                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2615                                         *capture = 1;
2616                                         break;
2617                                 }
2618                         }
2619
2620                         if (!*capture) {
2621                                 dev_err(rtd->card->dev,
2622                                         "No CPU DAIs support capture for stream %s\n",
2623                                         rtd->dai_link->stream_name);
2624                                 return -EINVAL;
2625                         }
2626                 }
2627         } else {
2628                 /* Adapt stream for codec2codec links */
2629                 int cpu_capture = rtd->dai_link->params ?
2630                         SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
2631                 int cpu_playback = rtd->dai_link->params ?
2632                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2633
2634                 for_each_rtd_codec_dais(rtd, i, codec_dai) {
2635                         if (rtd->num_cpus == 1) {
2636                                 cpu_dai = asoc_rtd_to_cpu(rtd, 0);
2637                         } else if (rtd->num_cpus == rtd->num_codecs) {
2638                                 cpu_dai = asoc_rtd_to_cpu(rtd, i);
2639                         } else {
2640                                 dev_err(rtd->card->dev,
2641                                         "N cpus to M codecs link is not supported yet\n");
2642                                 return -EINVAL;
2643                         }
2644
2645                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2646                             snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2647                                 *playback = 1;
2648                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2649                             snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2650                                 *capture = 1;
2651                 }
2652         }
2653
2654         if (rtd->dai_link->playback_only) {
2655                 *playback = 1;
2656                 *capture = 0;
2657         }
2658
2659         if (rtd->dai_link->capture_only) {
2660                 *playback = 0;
2661                 *capture = 1;
2662         }
2663
2664         return 0;
2665 }
2666
2667 static int soc_create_pcm(struct snd_pcm **pcm,
2668                           struct snd_soc_pcm_runtime *rtd,
2669                           int playback, int capture, int num)
2670 {
2671         char new_name[64];
2672         int ret;
2673
2674         /* create the PCM */
2675         if (rtd->dai_link->params) {
2676                 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2677                          rtd->dai_link->stream_name);
2678
2679                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2680                                            playback, capture, pcm);
2681         } else if (rtd->dai_link->no_pcm) {
2682                 snprintf(new_name, sizeof(new_name), "(%s)",
2683                         rtd->dai_link->stream_name);
2684
2685                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2686                                 playback, capture, pcm);
2687         } else {
2688                 if (rtd->dai_link->dynamic)
2689                         snprintf(new_name, sizeof(new_name), "%s (*)",
2690                                 rtd->dai_link->stream_name);
2691                 else
2692                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2693                                 rtd->dai_link->stream_name,
2694                                 soc_codec_dai_name(rtd), num);
2695
2696                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2697                         capture, pcm);
2698         }
2699         if (ret < 0) {
2700                 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2701                         new_name, rtd->dai_link->name, ret);
2702                 return ret;
2703         }
2704         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2705
2706         return 0;
2707 }
2708
2709 /* create a new pcm */
2710 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2711 {
2712         struct snd_soc_component *component;
2713         struct snd_pcm *pcm;
2714         int ret = 0, playback = 0, capture = 0;
2715         int i;
2716
2717         ret = soc_get_playback_capture(rtd, &playback, &capture);
2718         if (ret < 0)
2719                 return ret;
2720
2721         ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
2722         if (ret < 0)
2723                 return ret;
2724
2725         /* DAPM dai link stream work */
2726         if (rtd->dai_link->params)
2727                 rtd->close_delayed_work_func = codec2codec_close_delayed_work;
2728         else
2729                 rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2730
2731         rtd->pcm = pcm;
2732         pcm->nonatomic = rtd->dai_link->nonatomic;
2733         pcm->private_data = rtd;
2734
2735         if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
2736                 if (playback)
2737                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2738                 if (capture)
2739                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2740                 goto out;
2741         }
2742
2743         /* ASoC PCM operations */
2744         if (rtd->dai_link->dynamic) {
2745                 rtd->ops.open           = dpcm_fe_dai_open;
2746                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2747                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2748                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2749                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2750                 rtd->ops.close          = dpcm_fe_dai_close;
2751                 rtd->ops.pointer        = soc_pcm_pointer;
2752         } else {
2753                 rtd->ops.open           = soc_pcm_open;
2754                 rtd->ops.hw_params      = soc_pcm_hw_params;
2755                 rtd->ops.prepare        = soc_pcm_prepare;
2756                 rtd->ops.trigger        = soc_pcm_trigger;
2757                 rtd->ops.hw_free        = soc_pcm_hw_free;
2758                 rtd->ops.close          = soc_pcm_close;
2759                 rtd->ops.pointer        = soc_pcm_pointer;
2760         }
2761
2762         for_each_rtd_components(rtd, i, component) {
2763                 const struct snd_soc_component_driver *drv = component->driver;
2764
2765                 if (drv->ioctl)
2766                         rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2767                 if (drv->sync_stop)
2768                         rtd->ops.sync_stop      = snd_soc_pcm_component_sync_stop;
2769                 if (drv->copy_user)
2770                         rtd->ops.copy_user      = snd_soc_pcm_component_copy_user;
2771                 if (drv->page)
2772                         rtd->ops.page           = snd_soc_pcm_component_page;
2773                 if (drv->mmap)
2774                         rtd->ops.mmap           = snd_soc_pcm_component_mmap;
2775                 if (drv->ack)
2776                         rtd->ops.ack            = snd_soc_pcm_component_ack;
2777         }
2778
2779         if (playback)
2780                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2781
2782         if (capture)
2783                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2784
2785         ret = snd_soc_pcm_component_new(rtd);
2786         if (ret < 0)
2787                 return ret;
2788
2789         pcm->no_device_suspend = true;
2790 out:
2791         dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
2792                 soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
2793         return ret;
2794 }
2795
2796 /* is the current PCM operation for this FE ? */
2797 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2798 {
2799         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2800                 return 1;
2801         return 0;
2802 }
2803 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2804
2805 /* is the current PCM operation for this BE ? */
2806 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2807                 struct snd_soc_pcm_runtime *be, int stream)
2808 {
2809         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2810            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2811                   be->dpcm[stream].runtime_update))
2812                 return 1;
2813         return 0;
2814 }
2815 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2816
2817 /* get the substream for this BE */
2818 struct snd_pcm_substream *
2819         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2820 {
2821         return be->pcm->streams[stream].substream;
2822 }
2823 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2824
2825 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
2826                                     struct snd_soc_pcm_runtime *be,
2827                                     int stream,
2828                                     const enum snd_soc_dpcm_state *states,
2829                                     int num_states)
2830 {
2831         struct snd_soc_dpcm *dpcm;
2832         int state;
2833         int ret = 1;
2834         unsigned long flags;
2835         int i;
2836
2837         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
2838         for_each_dpcm_fe(be, stream, dpcm) {
2839
2840                 if (dpcm->fe == fe)
2841                         continue;
2842
2843                 state = dpcm->fe->dpcm[stream].state;
2844                 for (i = 0; i < num_states; i++) {
2845                         if (state == states[i]) {
2846                                 ret = 0;
2847                                 break;
2848                         }
2849                 }
2850         }
2851         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
2852
2853         /* it's safe to do this BE DAI */
2854         return ret;
2855 }
2856
2857 /*
2858  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2859  * are not running, paused or suspended for the specified stream direction.
2860  */
2861 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2862                 struct snd_soc_pcm_runtime *be, int stream)
2863 {
2864         const enum snd_soc_dpcm_state state[] = {
2865                 SND_SOC_DPCM_STATE_START,
2866                 SND_SOC_DPCM_STATE_PAUSED,
2867                 SND_SOC_DPCM_STATE_SUSPEND,
2868         };
2869
2870         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
2871 }
2872 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2873
2874 /*
2875  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2876  * running, paused or suspended for the specified stream direction.
2877  */
2878 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2879                 struct snd_soc_pcm_runtime *be, int stream)
2880 {
2881         const enum snd_soc_dpcm_state state[] = {
2882                 SND_SOC_DPCM_STATE_START,
2883                 SND_SOC_DPCM_STATE_PAUSED,
2884                 SND_SOC_DPCM_STATE_SUSPEND,
2885                 SND_SOC_DPCM_STATE_PREPARE,
2886         };
2887
2888         return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
2889 }
2890 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);