sound/soc/soc-pcm.c

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This source file includes following definitions.
snd_soc_runtime_activate
snd_soc_runtime_deactivate
snd_soc_runtime_ignore_pmdown_time
snd_soc_set_runtime_hwparams
dpcm_dapm_stream_event
soc_pcm_apply_symmetry
soc_pcm_params_symmetry
soc_pcm_has_symmetry
soc_pcm_set_msb
soc_pcm_apply_msb
soc_pcm_init_runtime_hw
soc_pcm_components_open
soc_pcm_components_close
soc_pcm_open
close_delayed_work
codec2codec_close_delayed_work
soc_pcm_close
soc_pcm_prepare
soc_pcm_codec_params_fixup
soc_pcm_components_hw_free
soc_pcm_hw_params
soc_pcm_hw_free
soc_pcm_trigger
soc_pcm_bespoke_trigger
soc_pcm_pointer
dpcm_be_connect
dpcm_be_reparent
dpcm_be_disconnect
dpcm_get_be
dai_get_widget
widget_in_list
dpcm_end_walk_at_be
dpcm_path_get
dpcm_prune_paths
dpcm_add_paths
dpcm_process_paths
dpcm_clear_pending_state
dpcm_be_dai_startup_unwind
dpcm_be_dai_startup
dpcm_init_runtime_hw
dpcm_runtime_merge_format
dpcm_runtime_merge_chan
dpcm_runtime_merge_rate
dpcm_set_fe_runtime
dpcm_set_fe_update_state
dpcm_apply_symmetry
dpcm_fe_dai_startup
dpcm_be_dai_shutdown
dpcm_fe_dai_shutdown
dpcm_be_dai_hw_free
dpcm_fe_dai_hw_free
dpcm_be_dai_hw_params
dpcm_fe_dai_hw_params
dpcm_do_trigger
dpcm_be_dai_trigger
dpcm_dai_trigger_fe_be
dpcm_fe_dai_do_trigger
dpcm_fe_dai_trigger
dpcm_be_dai_prepare
dpcm_fe_dai_prepare
dpcm_run_update_shutdown
dpcm_run_update_startup
dpcm_run_new_update
dpcm_run_old_update
soc_dpcm_fe_runtime_update
soc_dpcm_runtime_update
soc_dpcm_be_digital_mute
dpcm_fe_dai_open
dpcm_fe_dai_close
soc_pcm_private_free
soc_new_pcm
snd_soc_dpcm_fe_can_update
snd_soc_dpcm_be_can_update
snd_soc_dpcm_get_substream
snd_soc_dpcm_be_get_state
snd_soc_dpcm_be_set_state
snd_soc_dpcm_can_be_free_stop
snd_soc_dpcm_can_be_params
dpcm_state_string
dpcm_show_state
dpcm_state_read_file
soc_dpcm_debugfs_add
   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/initval.h>
  28 
  29 #define DPCM_MAX_BE_USERS       8
  30 
  31 /**
  32  * snd_soc_runtime_activate() - Increment active count for PCM runtime components
  33  * @rtd: ASoC PCM runtime that is activated
  34  * @stream: Direction of the PCM stream
  35  *
  36  * Increments the active count for all the DAIs and components attached to a PCM
  37  * runtime. Should typically be called when a stream is opened.
  38  *
  39  * Must be called with the rtd->card->pcm_mutex being held
  40  */
  41 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
  42 {
  43         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  44         struct snd_soc_dai *codec_dai;
  45         int i;
  46 
  47         lockdep_assert_held(&rtd->card->pcm_mutex);
  48 
  49         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  50                 cpu_dai->playback_active++;
  51                 for_each_rtd_codec_dai(rtd, i, codec_dai)
  52                         codec_dai->playback_active++;
  53         } else {
  54                 cpu_dai->capture_active++;
  55                 for_each_rtd_codec_dai(rtd, i, codec_dai)
  56                         codec_dai->capture_active++;
  57         }
  58 
  59         cpu_dai->active++;
  60         cpu_dai->component->active++;
  61         for_each_rtd_codec_dai(rtd, i, codec_dai) {
  62                 codec_dai->active++;
  63                 codec_dai->component->active++;
  64         }
  65 }
  66 
  67 /**
  68  * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
  69  * @rtd: ASoC PCM runtime that is deactivated
  70  * @stream: Direction of the PCM stream
  71  *
  72  * Decrements the active count for all the DAIs and components attached to a PCM
  73  * runtime. Should typically be called when a stream is closed.
  74  *
  75  * Must be called with the rtd->card->pcm_mutex being held
  76  */
  77 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
  78 {
  79         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  80         struct snd_soc_dai *codec_dai;
  81         int i;
  82 
  83         lockdep_assert_held(&rtd->card->pcm_mutex);
  84 
  85         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  86                 cpu_dai->playback_active--;
  87                 for_each_rtd_codec_dai(rtd, i, codec_dai)
  88                         codec_dai->playback_active--;
  89         } else {
  90                 cpu_dai->capture_active--;
  91                 for_each_rtd_codec_dai(rtd, i, codec_dai)
  92                         codec_dai->capture_active--;
  93         }
  94 
  95         cpu_dai->active--;
  96         cpu_dai->component->active--;
  97         for_each_rtd_codec_dai(rtd, i, codec_dai) {
  98                 codec_dai->component->active--;
  99                 codec_dai->active--;
 100         }
 101 }
 102 
 103 /**
 104  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 105  * @rtd: The ASoC PCM runtime that should be checked.
 106  *
 107  * This function checks whether the power down delay should be ignored for a
 108  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 109  * been configured to ignore the delay, or if none of the components benefits
 110  * from having the delay.
 111  */
 112 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 113 {
 114         struct snd_soc_rtdcom_list *rtdcom;
 115         struct snd_soc_component *component;
 116         bool ignore = true;
 117 
 118         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 119                 return true;
 120 
 121         for_each_rtdcom(rtd, rtdcom) {
 122                 component = rtdcom->component;
 123 
 124                 ignore &= !component->driver->use_pmdown_time;
 125         }
 126 
 127         return ignore;
 128 }
 129 
 130 /**
 131  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 132  * @substream: the pcm substream
 133  * @hw: the hardware parameters
 134  *
 135  * Sets the substream runtime hardware parameters.
 136  */
 137 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 138         const struct snd_pcm_hardware *hw)
 139 {
 140         struct snd_pcm_runtime *runtime = substream->runtime;
 141         runtime->hw.info = hw->info;
 142         runtime->hw.formats = hw->formats;
 143         runtime->hw.period_bytes_min = hw->period_bytes_min;
 144         runtime->hw.period_bytes_max = hw->period_bytes_max;
 145         runtime->hw.periods_min = hw->periods_min;
 146         runtime->hw.periods_max = hw->periods_max;
 147         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
 148         runtime->hw.fifo_size = hw->fifo_size;
 149         return 0;
 150 }
 151 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 152 
 153 /* DPCM stream event, send event to FE and all active BEs. */
 154 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 155         int event)
 156 {
 157         struct snd_soc_dpcm *dpcm;
 158 
 159         for_each_dpcm_be(fe, dir, dpcm) {
 160 
 161                 struct snd_soc_pcm_runtime *be = dpcm->be;
 162 
 163                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 164                                 be->dai_link->name, event, dir);
 165 
 166                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
 167                     (be->dpcm[dir].users >= 1))
 168                         continue;
 169 
 170                 snd_soc_dapm_stream_event(be, dir, event);
 171         }
 172 
 173         snd_soc_dapm_stream_event(fe, dir, event);
 174 
 175         return 0;
 176 }
 177 
 178 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 179                                         struct snd_soc_dai *soc_dai)
 180 {
 181         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 182         int ret;
 183 
 184         if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
 185                                 rtd->dai_link->symmetric_rates)) {
 186                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
 187                                 soc_dai->rate);
 188 
 189                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 190                                                 SNDRV_PCM_HW_PARAM_RATE,
 191                                                 soc_dai->rate);
 192                 if (ret < 0) {
 193                         dev_err(soc_dai->dev,
 194                                 "ASoC: Unable to apply rate constraint: %d\n",
 195                                 ret);
 196                         return ret;
 197                 }
 198         }
 199 
 200         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
 201                                 rtd->dai_link->symmetric_channels)) {
 202                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
 203                                 soc_dai->channels);
 204 
 205                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 206                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
 207                                                 soc_dai->channels);
 208                 if (ret < 0) {
 209                         dev_err(soc_dai->dev,
 210                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
 211                                 ret);
 212                         return ret;
 213                 }
 214         }
 215 
 216         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
 217                                 rtd->dai_link->symmetric_samplebits)) {
 218                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
 219                                 soc_dai->sample_bits);
 220 
 221                 ret = snd_pcm_hw_constraint_single(substream->runtime,
 222                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
 223                                                 soc_dai->sample_bits);
 224                 if (ret < 0) {
 225                         dev_err(soc_dai->dev,
 226                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
 227                                 ret);
 228                         return ret;
 229                 }
 230         }
 231 
 232         return 0;
 233 }
 234 
 235 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 236                                 struct snd_pcm_hw_params *params)
 237 {
 238         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 239         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 240         struct snd_soc_dai *codec_dai;
 241         unsigned int rate, channels, sample_bits, symmetry, i;
 242 
 243         rate = params_rate(params);
 244         channels = params_channels(params);
 245         sample_bits = snd_pcm_format_physical_width(params_format(params));
 246 
 247         /* reject unmatched parameters when applying symmetry */
 248         symmetry = cpu_dai->driver->symmetric_rates ||
 249                 rtd->dai_link->symmetric_rates;
 250 
 251         for_each_rtd_codec_dai(rtd, i, codec_dai)
 252                 symmetry |= codec_dai->driver->symmetric_rates;
 253 
 254         if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
 255                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
 256                                 cpu_dai->rate, rate);
 257                 return -EINVAL;
 258         }
 259 
 260         symmetry = cpu_dai->driver->symmetric_channels ||
 261                 rtd->dai_link->symmetric_channels;
 262 
 263         for_each_rtd_codec_dai(rtd, i, codec_dai)
 264                 symmetry |= codec_dai->driver->symmetric_channels;
 265 
 266         if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
 267                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
 268                                 cpu_dai->channels, channels);
 269                 return -EINVAL;
 270         }
 271 
 272         symmetry = cpu_dai->driver->symmetric_samplebits ||
 273                 rtd->dai_link->symmetric_samplebits;
 274 
 275         for_each_rtd_codec_dai(rtd, i, codec_dai)
 276                 symmetry |= codec_dai->driver->symmetric_samplebits;
 277 
 278         if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
 279                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
 280                                 cpu_dai->sample_bits, sample_bits);
 281                 return -EINVAL;
 282         }
 283 
 284         return 0;
 285 }
 286 
 287 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
 288 {
 289         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 290         struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
 291         struct snd_soc_dai_link *link = rtd->dai_link;
 292         struct snd_soc_dai *codec_dai;
 293         unsigned int symmetry, i;
 294 
 295         symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
 296                 cpu_driver->symmetric_channels || link->symmetric_channels ||
 297                 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
 298 
 299         for_each_rtd_codec_dai(rtd, i, codec_dai)
 300                 symmetry = symmetry ||
 301                         codec_dai->driver->symmetric_rates ||
 302                         codec_dai->driver->symmetric_channels ||
 303                         codec_dai->driver->symmetric_samplebits;
 304 
 305         return symmetry;
 306 }
 307 
 308 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 309 {
 310         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 311         int ret;
 312 
 313         if (!bits)
 314                 return;
 315 
 316         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
 317         if (ret != 0)
 318                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
 319                                  bits, ret);
 320 }
 321 
 322 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 323 {
 324         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 325         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 326         struct snd_soc_dai *codec_dai;
 327         int i;
 328         unsigned int bits = 0, cpu_bits;
 329 
 330         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 331                 for_each_rtd_codec_dai(rtd, i, codec_dai) {
 332                         if (codec_dai->driver->playback.sig_bits == 0) {
 333                                 bits = 0;
 334                                 break;
 335                         }
 336                         bits = max(codec_dai->driver->playback.sig_bits, bits);
 337                 }
 338                 cpu_bits = cpu_dai->driver->playback.sig_bits;
 339         } else {
 340                 for_each_rtd_codec_dai(rtd, i, codec_dai) {
 341                         if (codec_dai->driver->capture.sig_bits == 0) {
 342                                 bits = 0;
 343                                 break;
 344                         }
 345                         bits = max(codec_dai->driver->capture.sig_bits, bits);
 346                 }
 347                 cpu_bits = cpu_dai->driver->capture.sig_bits;
 348         }
 349 
 350         soc_pcm_set_msb(substream, bits);
 351         soc_pcm_set_msb(substream, cpu_bits);
 352 }
 353 
 354 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 355 {
 356         struct snd_pcm_runtime *runtime = substream->runtime;
 357         struct snd_pcm_hardware *hw = &runtime->hw;
 358         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 359         struct snd_soc_dai *codec_dai;
 360         struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
 361         struct snd_soc_dai_driver *codec_dai_drv;
 362         struct snd_soc_pcm_stream *codec_stream;
 363         struct snd_soc_pcm_stream *cpu_stream;
 364         unsigned int chan_min = 0, chan_max = UINT_MAX;
 365         unsigned int rate_min = 0, rate_max = UINT_MAX;
 366         unsigned int rates = UINT_MAX;
 367         u64 formats = ULLONG_MAX;
 368         int i;
 369 
 370         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 371                 cpu_stream = &cpu_dai_drv->playback;
 372         else
 373                 cpu_stream = &cpu_dai_drv->capture;
 374 
 375         /* first calculate min/max only for CODECs in the DAI link */
 376         for_each_rtd_codec_dai(rtd, i, codec_dai) {
 377 
 378                 /*
 379                  * Skip CODECs which don't support the current stream type.
 380                  * Otherwise, since the rate, channel, and format values will
 381                  * zero in that case, we would have no usable settings left,
 382                  * causing the resulting setup to fail.
 383                  * At least one CODEC should match, otherwise we should have
 384                  * bailed out on a higher level, since there would be no
 385                  * CODEC to support the transfer direction in that case.
 386                  */
 387                 if (!snd_soc_dai_stream_valid(codec_dai,
 388                                               substream->stream))
 389                         continue;
 390 
 391                 codec_dai_drv = codec_dai->driver;
 392                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 393                         codec_stream = &codec_dai_drv->playback;
 394                 else
 395                         codec_stream = &codec_dai_drv->capture;
 396                 chan_min = max(chan_min, codec_stream->channels_min);
 397                 chan_max = min(chan_max, codec_stream->channels_max);
 398                 rate_min = max(rate_min, codec_stream->rate_min);
 399                 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
 400                 formats &= codec_stream->formats;
 401                 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
 402         }
 403 
 404         /*
 405          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 406          * connected to a single CPU DAI, use CPU DAI's directly and let
 407          * channel allocation be fixed up later
 408          */
 409         if (rtd->num_codecs > 1) {
 410                 chan_min = cpu_stream->channels_min;
 411                 chan_max = cpu_stream->channels_max;
 412         }
 413 
 414         hw->channels_min = max(chan_min, cpu_stream->channels_min);
 415         hw->channels_max = min(chan_max, cpu_stream->channels_max);
 416         if (hw->formats)
 417                 hw->formats &= formats & cpu_stream->formats;
 418         else
 419                 hw->formats = formats & cpu_stream->formats;
 420         hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
 421 
 422         snd_pcm_limit_hw_rates(runtime);
 423 
 424         hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
 425         hw->rate_min = max(hw->rate_min, rate_min);
 426         hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
 427         hw->rate_max = min_not_zero(hw->rate_max, rate_max);
 428 }
 429 
 430 static int soc_pcm_components_open(struct snd_pcm_substream *substream,
 431                                    struct snd_soc_component **last)
 432 {
 433         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 434         struct snd_soc_rtdcom_list *rtdcom;
 435         struct snd_soc_component *component;
 436         int ret = 0;
 437 
 438         for_each_rtdcom(rtd, rtdcom) {
 439                 component = rtdcom->component;
 440                 *last = component;
 441 
 442                 ret = snd_soc_component_module_get_when_open(component);
 443                 if (ret < 0) {
 444                         dev_err(component->dev,
 445                                 "ASoC: can't get module %s\n",
 446                                 component->name);
 447                         return ret;
 448                 }
 449 
 450                 ret = snd_soc_component_open(component, substream);
 451                 if (ret < 0) {
 452                         dev_err(component->dev,
 453                                 "ASoC: can't open component %s: %d\n",
 454                                 component->name, ret);
 455                         return ret;
 456                 }
 457         }
 458         *last = NULL;
 459         return 0;
 460 }
 461 
 462 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
 463                                     struct snd_soc_component *last)
 464 {
 465         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 466         struct snd_soc_rtdcom_list *rtdcom;
 467         struct snd_soc_component *component;
 468         int ret = 0;
 469 
 470         for_each_rtdcom(rtd, rtdcom) {
 471                 component = rtdcom->component;
 472 
 473                 if (component == last)
 474                         break;
 475 
 476                 ret |= snd_soc_component_close(component, substream);
 477                 snd_soc_component_module_put_when_close(component);
 478         }
 479 
 480         return ret;
 481 }
 482 
 483 /*
 484  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 485  * then initialized and any private data can be allocated. This also calls
 486  * startup for the cpu DAI, component, machine and codec DAI.
 487  */
 488 static int soc_pcm_open(struct snd_pcm_substream *substream)
 489 {
 490         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 491         struct snd_pcm_runtime *runtime = substream->runtime;
 492         struct snd_soc_component *component;
 493         struct snd_soc_rtdcom_list *rtdcom;
 494         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 495         struct snd_soc_dai *codec_dai;
 496         const char *codec_dai_name = "multicodec";
 497         int i, ret = 0;
 498 
 499         pinctrl_pm_select_default_state(cpu_dai->dev);
 500         for_each_rtd_codec_dai(rtd, i, codec_dai)
 501                 pinctrl_pm_select_default_state(codec_dai->dev);
 502 
 503         for_each_rtdcom(rtd, rtdcom) {
 504                 component = rtdcom->component;
 505 
 506                 pm_runtime_get_sync(component->dev);
 507         }
 508 
 509         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 510 
 511         /* startup the audio subsystem */
 512         ret = snd_soc_dai_startup(cpu_dai, substream);
 513         if (ret < 0) {
 514                 dev_err(cpu_dai->dev, "ASoC: can't open interface %s: %d\n",
 515                         cpu_dai->name, ret);
 516                 goto out;
 517         }
 518 
 519         ret = soc_pcm_components_open(substream, &component);
 520         if (ret < 0)
 521                 goto component_err;
 522 
 523         for_each_rtd_codec_dai(rtd, i, codec_dai) {
 524                 ret = snd_soc_dai_startup(codec_dai, substream);
 525                 if (ret < 0) {
 526                         dev_err(codec_dai->dev,
 527                                 "ASoC: can't open codec %s: %d\n",
 528                                 codec_dai->name, ret);
 529                         goto codec_dai_err;
 530                 }
 531 
 532                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 533                         codec_dai->tx_mask = 0;
 534                 else
 535                         codec_dai->rx_mask = 0;
 536         }
 537 
 538         if (rtd->dai_link->ops->startup) {
 539                 ret = rtd->dai_link->ops->startup(substream);
 540                 if (ret < 0) {
 541                         pr_err("ASoC: %s startup failed: %d\n",
 542                                rtd->dai_link->name, ret);
 543                         goto machine_err;
 544                 }
 545         }
 546 
 547         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 548         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 549                 goto dynamic;
 550 
 551         /* Check that the codec and cpu DAIs are compatible */
 552         soc_pcm_init_runtime_hw(substream);
 553 
 554         if (rtd->num_codecs == 1)
 555                 codec_dai_name = rtd->codec_dai->name;
 556 
 557         if (soc_pcm_has_symmetry(substream))
 558                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 559 
 560         ret = -EINVAL;
 561         if (!runtime->hw.rates) {
 562                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 563                         codec_dai_name, cpu_dai->name);
 564                 goto config_err;
 565         }
 566         if (!runtime->hw.formats) {
 567                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 568                         codec_dai_name, cpu_dai->name);
 569                 goto config_err;
 570         }
 571         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 572             runtime->hw.channels_min > runtime->hw.channels_max) {
 573                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 574                                 codec_dai_name, cpu_dai->name);
 575                 goto config_err;
 576         }
 577 
 578         soc_pcm_apply_msb(substream);
 579 
 580         /* Symmetry only applies if we've already got an active stream. */
 581         if (cpu_dai->active) {
 582                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 583                 if (ret != 0)
 584                         goto config_err;
 585         }
 586 
 587         for_each_rtd_codec_dai(rtd, i, codec_dai) {
 588                 if (codec_dai->active) {
 589                         ret = soc_pcm_apply_symmetry(substream, codec_dai);
 590                         if (ret != 0)
 591                                 goto config_err;
 592                 }
 593         }
 594 
 595         pr_debug("ASoC: %s <-> %s info:\n",
 596                         codec_dai_name, cpu_dai->name);
 597         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 598         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 599                  runtime->hw.channels_max);
 600         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 601                  runtime->hw.rate_max);
 602 
 603 dynamic:
 604 
 605         snd_soc_runtime_activate(rtd, substream->stream);
 606 
 607         mutex_unlock(&rtd->card->pcm_mutex);
 608         return 0;
 609 
 610 config_err:
 611         if (rtd->dai_link->ops->shutdown)
 612                 rtd->dai_link->ops->shutdown(substream);
 613 
 614 machine_err:
 615         i = rtd->num_codecs;
 616 
 617 codec_dai_err:
 618         for_each_rtd_codec_dai_rollback(rtd, i, codec_dai)
 619                 snd_soc_dai_shutdown(codec_dai, substream);
 620 
 621 component_err:
 622         soc_pcm_components_close(substream, component);
 623 
 624         snd_soc_dai_shutdown(cpu_dai, substream);
 625 out:
 626         mutex_unlock(&rtd->card->pcm_mutex);
 627 
 628         for_each_rtdcom(rtd, rtdcom) {
 629                 component = rtdcom->component;
 630 
 631                 pm_runtime_mark_last_busy(component->dev);
 632                 pm_runtime_put_autosuspend(component->dev);
 633         }
 634 
 635         for_each_rtd_codec_dai(rtd, i, codec_dai) {
 636                 if (!codec_dai->active)
 637                         pinctrl_pm_select_sleep_state(codec_dai->dev);
 638         }
 639         if (!cpu_dai->active)
 640                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 641 
 642         return ret;
 643 }
 644 
 645 /*
 646  * Power down the audio subsystem pmdown_time msecs after close is called.
 647  * This is to ensure there are no pops or clicks in between any music tracks
 648  * due to DAPM power cycling.
 649  */
 650 static void close_delayed_work(struct work_struct *work)
 651 {
 652         struct snd_soc_pcm_runtime *rtd =
 653                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 654         struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
 655 
 656         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 657 
 658         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 659                  codec_dai->driver->playback.stream_name,
 660                  codec_dai->playback_active ? "active" : "inactive",
 661                  rtd->pop_wait ? "yes" : "no");
 662 
 663         /* are we waiting on this codec DAI stream */
 664         if (rtd->pop_wait == 1) {
 665                 rtd->pop_wait = 0;
 666                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 667                                           SND_SOC_DAPM_STREAM_STOP);
 668         }
 669 
 670         mutex_unlock(&rtd->card->pcm_mutex);
 671 }
 672 
 673 static void codec2codec_close_delayed_work(struct work_struct *work)
 674 {
 675         /*
 676          * Currently nothing to do for c2c links
 677          * Since c2c links are internal nodes in the DAPM graph and
 678          * don't interface with the outside world or application layer
 679          * we don't have to do any special handling on close.
 680          */
 681 }
 682 
 683 /*
 684  * Called by ALSA when a PCM substream is closed. Private data can be
 685  * freed here. The cpu DAI, codec DAI, machine and components are also
 686  * shutdown.
 687  */
 688 static int soc_pcm_close(struct snd_pcm_substream *substream)
 689 {
 690         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 691         struct snd_soc_component *component;
 692         struct snd_soc_rtdcom_list *rtdcom;
 693         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 694         struct snd_soc_dai *codec_dai;
 695         int i;
 696 
 697         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 698 
 699         snd_soc_runtime_deactivate(rtd, substream->stream);
 700 
 701         /* clear the corresponding DAIs rate when inactive */
 702         if (!cpu_dai->active)
 703                 cpu_dai->rate = 0;
 704 
 705         for_each_rtd_codec_dai(rtd, i, codec_dai) {
 706                 if (!codec_dai->active)
 707                         codec_dai->rate = 0;
 708         }
 709 
 710         snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
 711 
 712         snd_soc_dai_shutdown(cpu_dai, substream);
 713 
 714         for_each_rtd_codec_dai(rtd, i, codec_dai)
 715                 snd_soc_dai_shutdown(codec_dai, substream);
 716 
 717         if (rtd->dai_link->ops->shutdown)
 718                 rtd->dai_link->ops->shutdown(substream);
 719 
 720         soc_pcm_components_close(substream, NULL);
 721 
 722         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 723                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
 724                         /* powered down playback stream now */
 725                         snd_soc_dapm_stream_event(rtd,
 726                                                   SNDRV_PCM_STREAM_PLAYBACK,
 727                                                   SND_SOC_DAPM_STREAM_STOP);
 728                 } else {
 729                         /* start delayed pop wq here for playback streams */
 730                         rtd->pop_wait = 1;
 731                         queue_delayed_work(system_power_efficient_wq,
 732                                            &rtd->delayed_work,
 733                                            msecs_to_jiffies(rtd->pmdown_time));
 734                 }
 735         } else {
 736                 /* capture streams can be powered down now */
 737                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 738                                           SND_SOC_DAPM_STREAM_STOP);
 739         }
 740 
 741         mutex_unlock(&rtd->card->pcm_mutex);
 742 
 743         for_each_rtdcom(rtd, rtdcom) {
 744                 component = rtdcom->component;
 745 
 746                 pm_runtime_mark_last_busy(component->dev);
 747                 pm_runtime_put_autosuspend(component->dev);
 748         }
 749 
 750         for_each_rtd_codec_dai(rtd, i, codec_dai) {
 751                 if (!codec_dai->active)
 752                         pinctrl_pm_select_sleep_state(codec_dai->dev);
 753         }
 754         if (!cpu_dai->active)
 755                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 756 
 757         return 0;
 758 }
 759 
 760 /*
 761  * Called by ALSA when the PCM substream is prepared, can set format, sample
 762  * rate, etc.  This function is non atomic and can be called multiple times,
 763  * it can refer to the runtime info.
 764  */
 765 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 766 {
 767         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 768         struct snd_soc_component *component;
 769         struct snd_soc_rtdcom_list *rtdcom;
 770         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 771         struct snd_soc_dai *codec_dai;
 772         int i, ret = 0;
 773 
 774         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 775 
 776         if (rtd->dai_link->ops->prepare) {
 777                 ret = rtd->dai_link->ops->prepare(substream);
 778                 if (ret < 0) {
 779                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 780                                 " %d\n", ret);
 781                         goto out;
 782                 }
 783         }
 784 
 785         for_each_rtdcom(rtd, rtdcom) {
 786                 component = rtdcom->component;
 787 
 788                 ret = snd_soc_component_prepare(component, substream);
 789                 if (ret < 0) {
 790                         dev_err(component->dev,
 791                                 "ASoC: platform prepare error: %d\n", ret);
 792                         goto out;
 793                 }
 794         }
 795 
 796         for_each_rtd_codec_dai(rtd, i, codec_dai) {
 797                 ret = snd_soc_dai_prepare(codec_dai, substream);
 798                 if (ret < 0) {
 799                         dev_err(codec_dai->dev,
 800                                 "ASoC: codec DAI prepare error: %d\n",
 801                                 ret);
 802                         goto out;
 803                 }
 804         }
 805 
 806         ret = snd_soc_dai_prepare(cpu_dai, substream);
 807         if (ret < 0) {
 808                 dev_err(cpu_dai->dev,
 809                         "ASoC: cpu DAI prepare error: %d\n", ret);
 810                 goto out;
 811         }
 812 
 813         /* cancel any delayed stream shutdown that is pending */
 814         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 815             rtd->pop_wait) {
 816                 rtd->pop_wait = 0;
 817                 cancel_delayed_work(&rtd->delayed_work);
 818         }
 819 
 820         snd_soc_dapm_stream_event(rtd, substream->stream,
 821                         SND_SOC_DAPM_STREAM_START);
 822 
 823         for_each_rtd_codec_dai(rtd, i, codec_dai)
 824                 snd_soc_dai_digital_mute(codec_dai, 0,
 825                                          substream->stream);
 826         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
 827 
 828 out:
 829         mutex_unlock(&rtd->card->pcm_mutex);
 830         return ret;
 831 }
 832 
 833 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 834                                        unsigned int mask)
 835 {
 836         struct snd_interval *interval;
 837         int channels = hweight_long(mask);
 838 
 839         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 840         interval->min = channels;
 841         interval->max = channels;
 842 }
 843 
 844 static int soc_pcm_components_hw_free(struct snd_pcm_substream *substream,
 845                                       struct snd_soc_component *last)
 846 {
 847         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 848         struct snd_soc_rtdcom_list *rtdcom;
 849         struct snd_soc_component *component;
 850         int ret = 0;
 851 
 852         for_each_rtdcom(rtd, rtdcom) {
 853                 component = rtdcom->component;
 854 
 855                 if (component == last)
 856                         break;
 857 
 858                 ret |= snd_soc_component_hw_free(component, substream);
 859         }
 860 
 861         return ret;
 862 }
 863 
 864 /*
 865  * Called by ALSA when the hardware params are set by application. This
 866  * function can also be called multiple times and can allocate buffers
 867  * (using snd_pcm_lib_* ). It's non-atomic.
 868  */
 869 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 870                                 struct snd_pcm_hw_params *params)
 871 {
 872         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 873         struct snd_soc_component *component;
 874         struct snd_soc_rtdcom_list *rtdcom;
 875         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 876         struct snd_soc_dai *codec_dai;
 877         int i, ret = 0;
 878 
 879         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 880 
 881         ret = soc_pcm_params_symmetry(substream, params);
 882         if (ret)
 883                 goto out;
 884 
 885         if (rtd->dai_link->ops->hw_params) {
 886                 ret = rtd->dai_link->ops->hw_params(substream, params);
 887                 if (ret < 0) {
 888                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 889                                 " failed: %d\n", ret);
 890                         goto out;
 891                 }
 892         }
 893 
 894         for_each_rtd_codec_dai(rtd, i, codec_dai) {
 895                 struct snd_pcm_hw_params codec_params;
 896 
 897                 /*
 898                  * Skip CODECs which don't support the current stream type,
 899                  * the idea being that if a CODEC is not used for the currently
 900                  * set up transfer direction, it should not need to be
 901                  * configured, especially since the configuration used might
 902                  * not even be supported by that CODEC. There may be cases
 903                  * however where a CODEC needs to be set up although it is
 904                  * actually not being used for the transfer, e.g. if a
 905                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
 906                  * for the DAI link including a playback-only CODEC.
 907                  * If this becomes necessary, we will have to augment the
 908                  * machine driver setup with information on how to act, so
 909                  * we can do the right thing here.
 910                  */
 911                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 912                         continue;
 913 
 914                 /* copy params for each codec */
 915                 codec_params = *params;
 916 
 917                 /* fixup params based on TDM slot masks */
 918                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 919                     codec_dai->tx_mask)
 920                         soc_pcm_codec_params_fixup(&codec_params,
 921                                                    codec_dai->tx_mask);
 922 
 923                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
 924                     codec_dai->rx_mask)
 925                         soc_pcm_codec_params_fixup(&codec_params,
 926                                                    codec_dai->rx_mask);
 927 
 928                 ret = snd_soc_dai_hw_params(codec_dai, substream,
 929                                             &codec_params);
 930                 if(ret < 0)
 931                         goto codec_err;
 932 
 933                 codec_dai->rate = params_rate(&codec_params);
 934                 codec_dai->channels = params_channels(&codec_params);
 935                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 936                                                 params_format(&codec_params));
 937 
 938                 snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
 939         }
 940 
 941         ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
 942         if (ret < 0)
 943                 goto interface_err;
 944 
 945         /* store the parameters for each DAIs */
 946         cpu_dai->rate = params_rate(params);
 947         cpu_dai->channels = params_channels(params);
 948         cpu_dai->sample_bits =
 949                 snd_pcm_format_physical_width(params_format(params));
 950 
 951         snd_soc_dapm_update_dai(substream, params, cpu_dai);
 952 
 953         for_each_rtdcom(rtd, rtdcom) {
 954                 component = rtdcom->component;
 955 
 956                 ret = snd_soc_component_hw_params(component, substream, params);
 957                 if (ret < 0) {
 958                         dev_err(component->dev,
 959                                 "ASoC: %s hw params failed: %d\n",
 960                                 component->name, ret);
 961                         goto component_err;
 962                 }
 963         }
 964         component = NULL;
 965 
 966 out:
 967         mutex_unlock(&rtd->card->pcm_mutex);
 968         return ret;
 969 
 970 component_err:
 971         soc_pcm_components_hw_free(substream, component);
 972 
 973         snd_soc_dai_hw_free(cpu_dai, substream);
 974         cpu_dai->rate = 0;
 975 
 976 interface_err:
 977         i = rtd->num_codecs;
 978 
 979 codec_err:
 980         for_each_rtd_codec_dai_rollback(rtd, i, codec_dai) {
 981                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 982                         continue;
 983 
 984                 snd_soc_dai_hw_free(codec_dai, substream);
 985                 codec_dai->rate = 0;
 986         }
 987 
 988         if (rtd->dai_link->ops->hw_free)
 989                 rtd->dai_link->ops->hw_free(substream);
 990 
 991         mutex_unlock(&rtd->card->pcm_mutex);
 992         return ret;
 993 }
 994 
 995 /*
 996  * Frees resources allocated by hw_params, can be called multiple times
 997  */
 998 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 999 {
1000         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1001         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1002         struct snd_soc_dai *codec_dai;
1003         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1004         int i;
1005 
1006         mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
1007 
1008         /* clear the corresponding DAIs parameters when going to be inactive */
1009         if (cpu_dai->active == 1) {
1010                 cpu_dai->rate = 0;
1011                 cpu_dai->channels = 0;
1012                 cpu_dai->sample_bits = 0;
1013         }
1014 
1015         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1016                 if (codec_dai->active == 1) {
1017                         codec_dai->rate = 0;
1018                         codec_dai->channels = 0;
1019                         codec_dai->sample_bits = 0;
1020                 }
1021         }
1022 
1023         /* apply codec digital mute */
1024         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1025                 if ((playback && codec_dai->playback_active == 1) ||
1026                     (!playback && codec_dai->capture_active == 1))
1027                         snd_soc_dai_digital_mute(codec_dai, 1,
1028                                                  substream->stream);
1029         }
1030 
1031         /* free any machine hw params */
1032         if (rtd->dai_link->ops->hw_free)
1033                 rtd->dai_link->ops->hw_free(substream);
1034 
1035         /* free any component resources */
1036         soc_pcm_components_hw_free(substream, NULL);
1037 
1038         /* now free hw params for the DAIs  */
1039         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1040                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1041                         continue;
1042 
1043                 snd_soc_dai_hw_free(codec_dai, substream);
1044         }
1045 
1046         snd_soc_dai_hw_free(cpu_dai, substream);
1047 
1048         mutex_unlock(&rtd->card->pcm_mutex);
1049         return 0;
1050 }
1051 
1052 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1053 {
1054         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1055         struct snd_soc_component *component;
1056         struct snd_soc_rtdcom_list *rtdcom;
1057         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1058         struct snd_soc_dai *codec_dai;
1059         int i, ret;
1060 
1061         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1062                 ret = snd_soc_dai_trigger(codec_dai, substream, cmd);
1063                 if (ret < 0)
1064                         return ret;
1065         }
1066 
1067         for_each_rtdcom(rtd, rtdcom) {
1068                 component = rtdcom->component;
1069 
1070                 ret = snd_soc_component_trigger(component, substream, cmd);
1071                 if (ret < 0)
1072                         return ret;
1073         }
1074 
1075         ret = snd_soc_dai_trigger(cpu_dai, substream, cmd);
1076         if (ret < 0)
1077                 return ret;
1078 
1079         if (rtd->dai_link->ops->trigger) {
1080                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1081                 if (ret < 0)
1082                         return ret;
1083         }
1084 
1085         return 0;
1086 }
1087 
1088 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1089                                    int cmd)
1090 {
1091         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1092         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1093         struct snd_soc_dai *codec_dai;
1094         int i, ret;
1095 
1096         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1097                 ret = snd_soc_dai_bespoke_trigger(codec_dai, substream, cmd);
1098                 if (ret < 0)
1099                         return ret;
1100         }
1101 
1102         ret = snd_soc_dai_bespoke_trigger(cpu_dai, substream, cmd);
1103         if (ret < 0)
1104                 return ret;
1105 
1106         return 0;
1107 }
1108 /*
1109  * soc level wrapper for pointer callback
1110  * If cpu_dai, codec_dai, component driver has the delay callback, then
1111  * the runtime->delay will be updated accordingly.
1112  */
1113 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1114 {
1115         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1116         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1117         struct snd_soc_dai *codec_dai;
1118         struct snd_pcm_runtime *runtime = substream->runtime;
1119         snd_pcm_uframes_t offset = 0;
1120         snd_pcm_sframes_t delay = 0;
1121         snd_pcm_sframes_t codec_delay = 0;
1122         int i;
1123 
1124         /* clearing the previous total delay */
1125         runtime->delay = 0;
1126 
1127         offset = snd_soc_pcm_component_pointer(substream);
1128 
1129         /* base delay if assigned in pointer callback */
1130         delay = runtime->delay;
1131 
1132         delay += snd_soc_dai_delay(cpu_dai, substream);
1133 
1134         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1135                 codec_delay = max(codec_delay,
1136                                   snd_soc_dai_delay(codec_dai, substream));
1137         }
1138         delay += codec_delay;
1139 
1140         runtime->delay = delay;
1141 
1142         return offset;
1143 }
1144 
1145 /* connect a FE and BE */
1146 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1147                 struct snd_soc_pcm_runtime *be, int stream)
1148 {
1149         struct snd_soc_dpcm *dpcm;
1150         unsigned long flags;
1151 #ifdef CONFIG_DEBUG_FS
1152         char *name;
1153 #endif
1154 
1155         /* only add new dpcms */
1156         for_each_dpcm_be(fe, stream, dpcm) {
1157                 if (dpcm->be == be && dpcm->fe == fe)
1158                         return 0;
1159         }
1160 
1161         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1162         if (!dpcm)
1163                 return -ENOMEM;
1164 
1165         dpcm->be = be;
1166         dpcm->fe = fe;
1167         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1168         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1169         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1170         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1171         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1172         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1173 
1174         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1175                         stream ? "capture" : "playback",  fe->dai_link->name,
1176                         stream ? "<-" : "->", be->dai_link->name);
1177 
1178 #ifdef CONFIG_DEBUG_FS
1179         name = kasprintf(GFP_KERNEL, "%s:%s", be->dai_link->name,
1180                          stream ? "capture" : "playback");
1181         if (name) {
1182                 dpcm->debugfs_state = debugfs_create_dir(name,
1183                                                          fe->debugfs_dpcm_root);
1184                 debugfs_create_u32("state", 0644, dpcm->debugfs_state,
1185                                    &dpcm->state);
1186                 kfree(name);
1187         }
1188 #endif
1189         return 1;
1190 }
1191 
1192 /* reparent a BE onto another FE */
1193 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1194                         struct snd_soc_pcm_runtime *be, int stream)
1195 {
1196         struct snd_soc_dpcm *dpcm;
1197         struct snd_pcm_substream *fe_substream, *be_substream;
1198 
1199         /* reparent if BE is connected to other FEs */
1200         if (!be->dpcm[stream].users)
1201                 return;
1202 
1203         be_substream = snd_soc_dpcm_get_substream(be, stream);
1204 
1205         for_each_dpcm_fe(be, stream, dpcm) {
1206                 if (dpcm->fe == fe)
1207                         continue;
1208 
1209                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1210                         stream ? "capture" : "playback",
1211                         dpcm->fe->dai_link->name,
1212                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1213 
1214                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1215                 be_substream->runtime = fe_substream->runtime;
1216                 break;
1217         }
1218 }
1219 
1220 /* disconnect a BE and FE */
1221 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1222 {
1223         struct snd_soc_dpcm *dpcm, *d;
1224         unsigned long flags;
1225 
1226         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1227                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1228                                 stream ? "capture" : "playback",
1229                                 dpcm->be->dai_link->name);
1230 
1231                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1232                         continue;
1233 
1234                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1235                         stream ? "capture" : "playback", fe->dai_link->name,
1236                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1237 
1238                 /* BEs still alive need new FE */
1239                 dpcm_be_reparent(fe, dpcm->be, stream);
1240 
1241 #ifdef CONFIG_DEBUG_FS
1242                 debugfs_remove_recursive(dpcm->debugfs_state);
1243 #endif
1244                 spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1245                 list_del(&dpcm->list_be);
1246                 list_del(&dpcm->list_fe);
1247                 spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1248                 kfree(dpcm);
1249         }
1250 }
1251 
1252 /* get BE for DAI widget and stream */
1253 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1254                 struct snd_soc_dapm_widget *widget, int stream)
1255 {
1256         struct snd_soc_pcm_runtime *be;
1257         struct snd_soc_dai *dai;
1258         int i;
1259 
1260         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1261 
1262         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1263                 for_each_card_rtds(card, be) {
1264 
1265                         if (!be->dai_link->no_pcm)
1266                                 continue;
1267 
1268                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1269                                 be->cpu_dai->playback_widget ?
1270                                 be->cpu_dai->playback_widget->name : "(not set)");
1271 
1272                         if (be->cpu_dai->playback_widget == widget)
1273                                 return be;
1274 
1275                         for_each_rtd_codec_dai(be, i, dai) {
1276                                 if (dai->playback_widget == widget)
1277                                         return be;
1278                         }
1279                 }
1280         } else {
1281 
1282                 for_each_card_rtds(card, be) {
1283 
1284                         if (!be->dai_link->no_pcm)
1285                                 continue;
1286 
1287                         dev_dbg(card->dev, "ASoC: try BE %s\n",
1288                                 be->cpu_dai->capture_widget ?
1289                                 be->cpu_dai->capture_widget->name : "(not set)");
1290 
1291                         if (be->cpu_dai->capture_widget == widget)
1292                                 return be;
1293 
1294                         for_each_rtd_codec_dai(be, i, dai) {
1295                                 if (dai->capture_widget == widget)
1296                                         return be;
1297                         }
1298                 }
1299         }
1300 
1301         /* dai link name and stream name set correctly ? */
1302         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1303                 stream ? "capture" : "playback", widget->name);
1304         return NULL;
1305 }
1306 
1307 static inline struct snd_soc_dapm_widget *
1308         dai_get_widget(struct snd_soc_dai *dai, int stream)
1309 {
1310         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1311                 return dai->playback_widget;
1312         else
1313                 return dai->capture_widget;
1314 }
1315 
1316 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1317                 struct snd_soc_dapm_widget *widget)
1318 {
1319         int i;
1320 
1321         for (i = 0; i < list->num_widgets; i++) {
1322                 if (widget == list->widgets[i])
1323                         return 1;
1324         }
1325 
1326         return 0;
1327 }
1328 
1329 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1330                 enum snd_soc_dapm_direction dir)
1331 {
1332         struct snd_soc_card *card = widget->dapm->card;
1333         struct snd_soc_pcm_runtime *rtd;
1334         struct snd_soc_dai *dai;
1335         int i;
1336 
1337         if (dir == SND_SOC_DAPM_DIR_OUT) {
1338                 for_each_card_rtds(card, rtd) {
1339                         if (!rtd->dai_link->no_pcm)
1340                                 continue;
1341 
1342                         if (rtd->cpu_dai->playback_widget == widget)
1343                                 return true;
1344 
1345                         for_each_rtd_codec_dai(rtd, i, dai) {
1346                                 if (dai->playback_widget == widget)
1347                                         return true;
1348                         }
1349                 }
1350         } else { /* SND_SOC_DAPM_DIR_IN */
1351                 for_each_card_rtds(card, rtd) {
1352                         if (!rtd->dai_link->no_pcm)
1353                                 continue;
1354 
1355                         if (rtd->cpu_dai->capture_widget == widget)
1356                                 return true;
1357 
1358                         for_each_rtd_codec_dai(rtd, i, dai) {
1359                                 if (dai->capture_widget == widget)
1360                                         return true;
1361                         }
1362                 }
1363         }
1364 
1365         return false;
1366 }
1367 
1368 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1369         int stream, struct snd_soc_dapm_widget_list **list)
1370 {
1371         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1372         int paths;
1373 
1374         /* get number of valid DAI paths and their widgets */
1375         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1376                         dpcm_end_walk_at_be);
1377 
1378         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1379                         stream ? "capture" : "playback");
1380 
1381         return paths;
1382 }
1383 
1384 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1385         struct snd_soc_dapm_widget_list **list_)
1386 {
1387         struct snd_soc_dpcm *dpcm;
1388         struct snd_soc_dapm_widget_list *list = *list_;
1389         struct snd_soc_dapm_widget *widget;
1390         struct snd_soc_dai *dai;
1391         int prune = 0;
1392         int do_prune;
1393 
1394         /* Destroy any old FE <--> BE connections */
1395         for_each_dpcm_be(fe, stream, dpcm) {
1396                 unsigned int i;
1397 
1398                 /* is there a valid CPU DAI widget for this BE */
1399                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1400 
1401                 /* prune the BE if it's no longer in our active list */
1402                 if (widget && widget_in_list(list, widget))
1403                         continue;
1404 
1405                 /* is there a valid CODEC DAI widget for this BE */
1406                 do_prune = 1;
1407                 for_each_rtd_codec_dai(dpcm->be, i, dai) {
1408                         widget = dai_get_widget(dai, stream);
1409 
1410                         /* prune the BE if it's no longer in our active list */
1411                         if (widget && widget_in_list(list, widget))
1412                                 do_prune = 0;
1413                 }
1414                 if (!do_prune)
1415                         continue;
1416 
1417                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1418                         stream ? "capture" : "playback",
1419                         dpcm->be->dai_link->name, fe->dai_link->name);
1420                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1421                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1422                 prune++;
1423         }
1424 
1425         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1426         return prune;
1427 }
1428 
1429 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1430         struct snd_soc_dapm_widget_list **list_)
1431 {
1432         struct snd_soc_card *card = fe->card;
1433         struct snd_soc_dapm_widget_list *list = *list_;
1434         struct snd_soc_pcm_runtime *be;
1435         int i, new = 0, err;
1436 
1437         /* Create any new FE <--> BE connections */
1438         for (i = 0; i < list->num_widgets; i++) {
1439 
1440                 switch (list->widgets[i]->id) {
1441                 case snd_soc_dapm_dai_in:
1442                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1443                                 continue;
1444                         break;
1445                 case snd_soc_dapm_dai_out:
1446                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1447                                 continue;
1448                         break;
1449                 default:
1450                         continue;
1451                 }
1452 
1453                 /* is there a valid BE rtd for this widget */
1454                 be = dpcm_get_be(card, list->widgets[i], stream);
1455                 if (!be) {
1456                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1457                                         list->widgets[i]->name);
1458                         continue;
1459                 }
1460 
1461                 /* make sure BE is a real BE */
1462                 if (!be->dai_link->no_pcm)
1463                         continue;
1464 
1465                 /* don't connect if FE is not running */
1466                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1467                         continue;
1468 
1469                 /* newly connected FE and BE */
1470                 err = dpcm_be_connect(fe, be, stream);
1471                 if (err < 0) {
1472                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1473                                 list->widgets[i]->name);
1474                         break;
1475                 } else if (err == 0) /* already connected */
1476                         continue;
1477 
1478                 /* new */
1479                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1480                 new++;
1481         }
1482 
1483         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1484         return new;
1485 }
1486 
1487 /*
1488  * Find the corresponding BE DAIs that source or sink audio to this
1489  * FE substream.
1490  */
1491 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1492         int stream, struct snd_soc_dapm_widget_list **list, int new)
1493 {
1494         if (new)
1495                 return dpcm_add_paths(fe, stream, list);
1496         else
1497                 return dpcm_prune_paths(fe, stream, list);
1498 }
1499 
1500 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1501 {
1502         struct snd_soc_dpcm *dpcm;
1503         unsigned long flags;
1504 
1505         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1506         for_each_dpcm_be(fe, stream, dpcm)
1507                 dpcm->be->dpcm[stream].runtime_update =
1508                                                 SND_SOC_DPCM_UPDATE_NO;
1509         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1510 }
1511 
1512 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1513         int stream)
1514 {
1515         struct snd_soc_dpcm *dpcm;
1516 
1517         /* disable any enabled and non active backends */
1518         for_each_dpcm_be(fe, stream, dpcm) {
1519 
1520                 struct snd_soc_pcm_runtime *be = dpcm->be;
1521                 struct snd_pcm_substream *be_substream =
1522                         snd_soc_dpcm_get_substream(be, stream);
1523 
1524                 if (be->dpcm[stream].users == 0)
1525                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1526                                 stream ? "capture" : "playback",
1527                                 be->dpcm[stream].state);
1528 
1529                 if (--be->dpcm[stream].users != 0)
1530                         continue;
1531 
1532                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1533                         continue;
1534 
1535                 soc_pcm_close(be_substream);
1536                 be_substream->runtime = NULL;
1537                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1538         }
1539 }
1540 
1541 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1542 {
1543         struct snd_soc_dpcm *dpcm;
1544         int err, count = 0;
1545 
1546         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1547         for_each_dpcm_be(fe, stream, dpcm) {
1548 
1549                 struct snd_soc_pcm_runtime *be = dpcm->be;
1550                 struct snd_pcm_substream *be_substream =
1551                         snd_soc_dpcm_get_substream(be, stream);
1552 
1553                 if (!be_substream) {
1554                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1555                                 stream ? "capture" : "playback");
1556                         continue;
1557                 }
1558 
1559                 /* is this op for this BE ? */
1560                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1561                         continue;
1562 
1563                 /* first time the dpcm is open ? */
1564                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1565                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1566                                 stream ? "capture" : "playback",
1567                                 be->dpcm[stream].state);
1568 
1569                 if (be->dpcm[stream].users++ != 0)
1570                         continue;
1571 
1572                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1573                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1574                         continue;
1575 
1576                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1577                         stream ? "capture" : "playback", be->dai_link->name);
1578 
1579                 be_substream->runtime = be->dpcm[stream].runtime;
1580                 err = soc_pcm_open(be_substream);
1581                 if (err < 0) {
1582                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1583                         be->dpcm[stream].users--;
1584                         if (be->dpcm[stream].users < 0)
1585                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1586                                         stream ? "capture" : "playback",
1587                                         be->dpcm[stream].state);
1588 
1589                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1590                         goto unwind;
1591                 }
1592 
1593                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1594                 count++;
1595         }
1596 
1597         return count;
1598 
1599 unwind:
1600         /* disable any enabled and non active backends */
1601         for_each_dpcm_be_rollback(fe, stream, dpcm) {
1602                 struct snd_soc_pcm_runtime *be = dpcm->be;
1603                 struct snd_pcm_substream *be_substream =
1604                         snd_soc_dpcm_get_substream(be, stream);
1605 
1606                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1607                         continue;
1608 
1609                 if (be->dpcm[stream].users == 0)
1610                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1611                                 stream ? "capture" : "playback",
1612                                 be->dpcm[stream].state);
1613 
1614                 if (--be->dpcm[stream].users != 0)
1615                         continue;
1616 
1617                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1618                         continue;
1619 
1620                 soc_pcm_close(be_substream);
1621                 be_substream->runtime = NULL;
1622                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1623         }
1624 
1625         return err;
1626 }
1627 
1628 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1629                                  struct snd_soc_pcm_stream *stream)
1630 {
1631         runtime->hw.rate_min = stream->rate_min;
1632         runtime->hw.rate_max = min_not_zero(stream->rate_max, UINT_MAX);
1633         runtime->hw.channels_min = stream->channels_min;
1634         runtime->hw.channels_max = stream->channels_max;
1635         if (runtime->hw.formats)
1636                 runtime->hw.formats &= stream->formats;
1637         else
1638                 runtime->hw.formats = stream->formats;
1639         runtime->hw.rates = stream->rates;
1640 }
1641 
1642 static void dpcm_runtime_merge_format(struct snd_pcm_substream *substream,
1643                                       u64 *formats)
1644 {
1645         struct snd_soc_pcm_runtime *fe = substream->private_data;
1646         struct snd_soc_dpcm *dpcm;
1647         struct snd_soc_dai *dai;
1648         int stream = substream->stream;
1649 
1650         if (!fe->dai_link->dpcm_merged_format)
1651                 return;
1652 
1653         /*
1654          * It returns merged BE codec format
1655          * if FE want to use it (= dpcm_merged_format)
1656          */
1657 
1658         for_each_dpcm_be(fe, stream, dpcm) {
1659                 struct snd_soc_pcm_runtime *be = dpcm->be;
1660                 struct snd_soc_dai_driver *codec_dai_drv;
1661                 struct snd_soc_pcm_stream *codec_stream;
1662                 int i;
1663 
1664                 for_each_rtd_codec_dai(be, i, dai) {
1665                         /*
1666                          * Skip CODECs which don't support the current stream
1667                          * type. See soc_pcm_init_runtime_hw() for more details
1668                          */
1669                         if (!snd_soc_dai_stream_valid(dai, stream))
1670                                 continue;
1671 
1672                         codec_dai_drv = dai->driver;
1673                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1674                                 codec_stream = &codec_dai_drv->playback;
1675                         else
1676                                 codec_stream = &codec_dai_drv->capture;
1677 
1678                         *formats &= codec_stream->formats;
1679                 }
1680         }
1681 }
1682 
1683 static void dpcm_runtime_merge_chan(struct snd_pcm_substream *substream,
1684                                     unsigned int *channels_min,
1685                                     unsigned int *channels_max)
1686 {
1687         struct snd_soc_pcm_runtime *fe = substream->private_data;
1688         struct snd_soc_dpcm *dpcm;
1689         int stream = substream->stream;
1690 
1691         if (!fe->dai_link->dpcm_merged_chan)
1692                 return;
1693 
1694         /*
1695          * It returns merged BE codec channel;
1696          * if FE want to use it (= dpcm_merged_chan)
1697          */
1698 
1699         for_each_dpcm_be(fe, stream, dpcm) {
1700                 struct snd_soc_pcm_runtime *be = dpcm->be;
1701                 struct snd_soc_dai_driver *cpu_dai_drv =  be->cpu_dai->driver;
1702                 struct snd_soc_dai_driver *codec_dai_drv;
1703                 struct snd_soc_pcm_stream *codec_stream;
1704                 struct snd_soc_pcm_stream *cpu_stream;
1705 
1706                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1707                         cpu_stream = &cpu_dai_drv->playback;
1708                 else
1709                         cpu_stream = &cpu_dai_drv->capture;
1710 
1711                 *channels_min = max(*channels_min, cpu_stream->channels_min);
1712                 *channels_max = min(*channels_max, cpu_stream->channels_max);
1713 
1714                 /*
1715                  * chan min/max cannot be enforced if there are multiple CODEC
1716                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1717                  */
1718                 if (be->num_codecs == 1) {
1719                         codec_dai_drv = be->codec_dais[0]->driver;
1720 
1721                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1722                                 codec_stream = &codec_dai_drv->playback;
1723                         else
1724                                 codec_stream = &codec_dai_drv->capture;
1725 
1726                         *channels_min = max(*channels_min,
1727                                             codec_stream->channels_min);
1728                         *channels_max = min(*channels_max,
1729                                             codec_stream->channels_max);
1730                 }
1731         }
1732 }
1733 
1734 static void dpcm_runtime_merge_rate(struct snd_pcm_substream *substream,
1735                                     unsigned int *rates,
1736                                     unsigned int *rate_min,
1737                                     unsigned int *rate_max)
1738 {
1739         struct snd_soc_pcm_runtime *fe = substream->private_data;
1740         struct snd_soc_dpcm *dpcm;
1741         int stream = substream->stream;
1742 
1743         if (!fe->dai_link->dpcm_merged_rate)
1744                 return;
1745 
1746         /*
1747          * It returns merged BE codec channel;
1748          * if FE want to use it (= dpcm_merged_chan)
1749          */
1750 
1751         for_each_dpcm_be(fe, stream, dpcm) {
1752                 struct snd_soc_pcm_runtime *be = dpcm->be;
1753                 struct snd_soc_dai_driver *cpu_dai_drv =  be->cpu_dai->driver;
1754                 struct snd_soc_dai_driver *codec_dai_drv;
1755                 struct snd_soc_pcm_stream *codec_stream;
1756                 struct snd_soc_pcm_stream *cpu_stream;
1757                 struct snd_soc_dai *dai;
1758                 int i;
1759 
1760                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1761                         cpu_stream = &cpu_dai_drv->playback;
1762                 else
1763                         cpu_stream = &cpu_dai_drv->capture;
1764 
1765                 *rate_min = max(*rate_min, cpu_stream->rate_min);
1766                 *rate_max = min_not_zero(*rate_max, cpu_stream->rate_max);
1767                 *rates = snd_pcm_rate_mask_intersect(*rates, cpu_stream->rates);
1768 
1769                 for_each_rtd_codec_dai(be, i, dai) {
1770                         /*
1771                          * Skip CODECs which don't support the current stream
1772                          * type. See soc_pcm_init_runtime_hw() for more details
1773                          */
1774                         if (!snd_soc_dai_stream_valid(dai, stream))
1775                                 continue;
1776 
1777                         codec_dai_drv = dai->driver;
1778                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1779                                 codec_stream = &codec_dai_drv->playback;
1780                         else
1781                                 codec_stream = &codec_dai_drv->capture;
1782 
1783                         *rate_min = max(*rate_min, codec_stream->rate_min);
1784                         *rate_max = min_not_zero(*rate_max,
1785                                                  codec_stream->rate_max);
1786                         *rates = snd_pcm_rate_mask_intersect(*rates,
1787                                                 codec_stream->rates);
1788                 }
1789         }
1790 }
1791 
1792 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1793 {
1794         struct snd_pcm_runtime *runtime = substream->runtime;
1795         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1796         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1797         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1798 
1799         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1800                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback);
1801         else
1802                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture);
1803 
1804         dpcm_runtime_merge_format(substream, &runtime->hw.formats);
1805         dpcm_runtime_merge_chan(substream, &runtime->hw.channels_min,
1806                                 &runtime->hw.channels_max);
1807         dpcm_runtime_merge_rate(substream, &runtime->hw.rates,
1808                                 &runtime->hw.rate_min, &runtime->hw.rate_max);
1809 }
1810 
1811 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1812 
1813 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1814  * for avoiding the race with trigger callback.
1815  * If the state is unset and a trigger is pending while the previous operation,
1816  * process the pending trigger action here.
1817  */
1818 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1819                                      int stream, enum snd_soc_dpcm_update state)
1820 {
1821         struct snd_pcm_substream *substream =
1822                 snd_soc_dpcm_get_substream(fe, stream);
1823 
1824         snd_pcm_stream_lock_irq(substream);
1825         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1826                 dpcm_fe_dai_do_trigger(substream,
1827                                        fe->dpcm[stream].trigger_pending - 1);
1828                 fe->dpcm[stream].trigger_pending = 0;
1829         }
1830         fe->dpcm[stream].runtime_update = state;
1831         snd_pcm_stream_unlock_irq(substream);
1832 }
1833 
1834 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1835                                int stream)
1836 {
1837         struct snd_soc_dpcm *dpcm;
1838         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1839         struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1840         int err;
1841 
1842         /* apply symmetry for FE */
1843         if (soc_pcm_has_symmetry(fe_substream))
1844                 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1845 
1846         /* Symmetry only applies if we've got an active stream. */
1847         if (fe_cpu_dai->active) {
1848                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1849                 if (err < 0)
1850                         return err;
1851         }
1852 
1853         /* apply symmetry for BE */
1854         for_each_dpcm_be(fe, stream, dpcm) {
1855                 struct snd_soc_pcm_runtime *be = dpcm->be;
1856                 struct snd_pcm_substream *be_substream =
1857                         snd_soc_dpcm_get_substream(be, stream);
1858                 struct snd_soc_pcm_runtime *rtd;
1859                 struct snd_soc_dai *codec_dai;
1860                 int i;
1861 
1862                 /* A backend may not have the requested substream */
1863                 if (!be_substream)
1864                         continue;
1865 
1866                 rtd = be_substream->private_data;
1867                 if (rtd->dai_link->be_hw_params_fixup)
1868                         continue;
1869 
1870                 if (soc_pcm_has_symmetry(be_substream))
1871                         be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1872 
1873                 /* Symmetry only applies if we've got an active stream. */
1874                 if (rtd->cpu_dai->active) {
1875                         err = soc_pcm_apply_symmetry(fe_substream,
1876                                                      rtd->cpu_dai);
1877                         if (err < 0)
1878                                 return err;
1879                 }
1880 
1881                 for_each_rtd_codec_dai(rtd, i, codec_dai) {
1882                         if (codec_dai->active) {
1883                                 err = soc_pcm_apply_symmetry(fe_substream,
1884                                                              codec_dai);
1885                                 if (err < 0)
1886                                         return err;
1887                         }
1888                 }
1889         }
1890 
1891         return 0;
1892 }
1893 
1894 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1895 {
1896         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1897         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1898         int stream = fe_substream->stream, ret = 0;
1899 
1900         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1901 
1902         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1903         if (ret < 0) {
1904                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1905                 goto be_err;
1906         }
1907 
1908         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1909 
1910         /* start the DAI frontend */
1911         ret = soc_pcm_open(fe_substream);
1912         if (ret < 0) {
1913                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1914                 goto unwind;
1915         }
1916 
1917         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1918 
1919         dpcm_set_fe_runtime(fe_substream);
1920         snd_pcm_limit_hw_rates(runtime);
1921 
1922         ret = dpcm_apply_symmetry(fe_substream, stream);
1923         if (ret < 0) {
1924                 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1925                         ret);
1926                 goto unwind;
1927         }
1928 
1929         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1930         return 0;
1931 
1932 unwind:
1933         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1934 be_err:
1935         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1936         return ret;
1937 }
1938 
1939 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1940 {
1941         struct snd_soc_dpcm *dpcm;
1942 
1943         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1944         for_each_dpcm_be(fe, stream, dpcm) {
1945 
1946                 struct snd_soc_pcm_runtime *be = dpcm->be;
1947                 struct snd_pcm_substream *be_substream =
1948                         snd_soc_dpcm_get_substream(be, stream);
1949 
1950                 /* is this op for this BE ? */
1951                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1952                         continue;
1953 
1954                 if (be->dpcm[stream].users == 0)
1955                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1956                                 stream ? "capture" : "playback",
1957                                 be->dpcm[stream].state);
1958 
1959                 if (--be->dpcm[stream].users != 0)
1960                         continue;
1961 
1962                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1963                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)) {
1964                         soc_pcm_hw_free(be_substream);
1965                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1966                 }
1967 
1968                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1969                         be->dai_link->name);
1970 
1971                 soc_pcm_close(be_substream);
1972                 be_substream->runtime = NULL;
1973 
1974                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1975         }
1976         return 0;
1977 }
1978 
1979 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1980 {
1981         struct snd_soc_pcm_runtime *fe = substream->private_data;
1982         int stream = substream->stream;
1983 
1984         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1985 
1986         /* shutdown the BEs */
1987         dpcm_be_dai_shutdown(fe, substream->stream);
1988 
1989         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1990 
1991         /* now shutdown the frontend */
1992         soc_pcm_close(substream);
1993 
1994         /* run the stream event for each BE */
1995         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1996 
1997         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1998         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1999         return 0;
2000 }
2001 
2002 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
2003 {
2004         struct snd_soc_dpcm *dpcm;
2005 
2006         /* only hw_params backends that are either sinks or sources
2007          * to this frontend DAI */
2008         for_each_dpcm_be(fe, stream, dpcm) {
2009 
2010                 struct snd_soc_pcm_runtime *be = dpcm->be;
2011                 struct snd_pcm_substream *be_substream =
2012                         snd_soc_dpcm_get_substream(be, stream);
2013 
2014                 /* is this op for this BE ? */
2015                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2016                         continue;
2017 
2018                 /* only free hw when no longer used - check all FEs */
2019                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2020                                 continue;
2021 
2022                 /* do not free hw if this BE is used by other FE */
2023                 if (be->dpcm[stream].users > 1)
2024                         continue;
2025 
2026                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2027                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2028                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2029                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
2030                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2031                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2032                         continue;
2033 
2034                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
2035                         be->dai_link->name);
2036 
2037                 soc_pcm_hw_free(be_substream);
2038 
2039                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2040         }
2041 
2042         return 0;
2043 }
2044 
2045 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
2046 {
2047         struct snd_soc_pcm_runtime *fe = substream->private_data;
2048         int err, stream = substream->stream;
2049 
2050         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2051         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2052 
2053         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
2054 
2055         /* call hw_free on the frontend */
2056         err = soc_pcm_hw_free(substream);
2057         if (err < 0)
2058                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
2059                         fe->dai_link->name);
2060 
2061         /* only hw_params backends that are either sinks or sources
2062          * to this frontend DAI */
2063         err = dpcm_be_dai_hw_free(fe, stream);
2064 
2065         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2066         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2067 
2068         mutex_unlock(&fe->card->mutex);
2069         return 0;
2070 }
2071 
2072 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
2073 {
2074         struct snd_soc_dpcm *dpcm;
2075         int ret;
2076 
2077         for_each_dpcm_be(fe, stream, dpcm) {
2078 
2079                 struct snd_soc_pcm_runtime *be = dpcm->be;
2080                 struct snd_pcm_substream *be_substream =
2081                         snd_soc_dpcm_get_substream(be, stream);
2082 
2083                 /* is this op for this BE ? */
2084                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2085                         continue;
2086 
2087                 /* copy params for each dpcm */
2088                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
2089                                 sizeof(struct snd_pcm_hw_params));
2090 
2091                 /* perform any hw_params fixups */
2092                 if (be->dai_link->be_hw_params_fixup) {
2093                         ret = be->dai_link->be_hw_params_fixup(be,
2094                                         &dpcm->hw_params);
2095                         if (ret < 0) {
2096                                 dev_err(be->dev,
2097                                         "ASoC: hw_params BE fixup failed %d\n",
2098                                         ret);
2099                                 goto unwind;
2100                         }
2101                 }
2102 
2103                 /* copy the fixed-up hw params for BE dai */
2104                 memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
2105                        sizeof(struct snd_pcm_hw_params));
2106 
2107                 /* only allow hw_params() if no connected FEs are running */
2108                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2109                         continue;
2110 
2111                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2112                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2113                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2114                         continue;
2115 
2116                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2117                         be->dai_link->name);
2118 
2119                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
2120                 if (ret < 0) {
2121                         dev_err(dpcm->be->dev,
2122                                 "ASoC: hw_params BE failed %d\n", ret);
2123                         goto unwind;
2124                 }
2125 
2126                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2127         }
2128         return 0;
2129 
2130 unwind:
2131         /* disable any enabled and non active backends */
2132         for_each_dpcm_be_rollback(fe, stream, dpcm) {
2133                 struct snd_soc_pcm_runtime *be = dpcm->be;
2134                 struct snd_pcm_substream *be_substream =
2135                         snd_soc_dpcm_get_substream(be, stream);
2136 
2137                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2138                         continue;
2139 
2140                 /* only allow hw_free() if no connected FEs are running */
2141                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2142                         continue;
2143 
2144                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2145                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2146                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2147                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2148                         continue;
2149 
2150                 soc_pcm_hw_free(be_substream);
2151         }
2152 
2153         return ret;
2154 }
2155 
2156 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2157                                  struct snd_pcm_hw_params *params)
2158 {
2159         struct snd_soc_pcm_runtime *fe = substream->private_data;
2160         int ret, stream = substream->stream;
2161 
2162         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2163         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2164 
2165         memcpy(&fe->dpcm[substream->stream].hw_params, params,
2166                         sizeof(struct snd_pcm_hw_params));
2167         ret = dpcm_be_dai_hw_params(fe, substream->stream);
2168         if (ret < 0) {
2169                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
2170                 goto out;
2171         }
2172 
2173         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2174                         fe->dai_link->name, params_rate(params),
2175                         params_channels(params), params_format(params));
2176 
2177         /* call hw_params on the frontend */
2178         ret = soc_pcm_hw_params(substream, params);
2179         if (ret < 0) {
2180                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
2181                 dpcm_be_dai_hw_free(fe, stream);
2182          } else
2183                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2184 
2185 out:
2186         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2187         mutex_unlock(&fe->card->mutex);
2188         return ret;
2189 }
2190 
2191 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2192                 struct snd_pcm_substream *substream, int cmd)
2193 {
2194         int ret;
2195 
2196         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2197                         dpcm->be->dai_link->name, cmd);
2198 
2199         ret = soc_pcm_trigger(substream, cmd);
2200         if (ret < 0)
2201                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2202 
2203         return ret;
2204 }
2205 
2206 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2207                                int cmd)
2208 {
2209         struct snd_soc_dpcm *dpcm;
2210         int ret = 0;
2211 
2212         for_each_dpcm_be(fe, stream, dpcm) {
2213 
2214                 struct snd_soc_pcm_runtime *be = dpcm->be;
2215                 struct snd_pcm_substream *be_substream =
2216                         snd_soc_dpcm_get_substream(be, stream);
2217 
2218                 /* is this op for this BE ? */
2219                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2220                         continue;
2221 
2222                 switch (cmd) {
2223                 case SNDRV_PCM_TRIGGER_START:
2224                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2225                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2226                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2227                                 continue;
2228 
2229                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2230                         if (ret)
2231                                 return ret;
2232 
2233                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2234                         break;
2235                 case SNDRV_PCM_TRIGGER_RESUME:
2236                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2237                                 continue;
2238 
2239                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2240                         if (ret)
2241                                 return ret;
2242 
2243                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2244                         break;
2245                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2246                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2247                                 continue;
2248 
2249                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2250                         if (ret)
2251                                 return ret;
2252 
2253                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2254                         break;
2255                 case SNDRV_PCM_TRIGGER_STOP:
2256                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2257                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2258                                 continue;
2259 
2260                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2261                                 continue;
2262 
2263                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2264                         if (ret)
2265                                 return ret;
2266 
2267                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2268                         break;
2269                 case SNDRV_PCM_TRIGGER_SUSPEND:
2270                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2271                                 continue;
2272 
2273                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2274                                 continue;
2275 
2276                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2277                         if (ret)
2278                                 return ret;
2279 
2280                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2281                         break;
2282                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2283                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2284                                 continue;
2285 
2286                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2287                                 continue;
2288 
2289                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2290                         if (ret)
2291                                 return ret;
2292 
2293                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2294                         break;
2295                 }
2296         }
2297 
2298         return ret;
2299 }
2300 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2301 
2302 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2303                                   int cmd, bool fe_first)
2304 {
2305         struct snd_soc_pcm_runtime *fe = substream->private_data;
2306         int ret;
2307 
2308         /* call trigger on the frontend before the backend. */
2309         if (fe_first) {
2310                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2311                         fe->dai_link->name, cmd);
2312 
2313                 ret = soc_pcm_trigger(substream, cmd);
2314                 if (ret < 0)
2315                         return ret;
2316 
2317                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2318                 return ret;
2319         }
2320 
2321         /* call trigger on the frontend after the backend. */
2322         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2323         if (ret < 0)
2324                 return ret;
2325 
2326         dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2327                 fe->dai_link->name, cmd);
2328 
2329         ret = soc_pcm_trigger(substream, cmd);
2330 
2331         return ret;
2332 }
2333 
2334 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2335 {
2336         struct snd_soc_pcm_runtime *fe = substream->private_data;
2337         int stream = substream->stream;
2338         int ret = 0;
2339         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2340 
2341         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2342 
2343         switch (trigger) {
2344         case SND_SOC_DPCM_TRIGGER_PRE:
2345                 switch (cmd) {
2346                 case SNDRV_PCM_TRIGGER_START:
2347                 case SNDRV_PCM_TRIGGER_RESUME:
2348                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2349                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2350                         break;
2351                 case SNDRV_PCM_TRIGGER_STOP:
2352                 case SNDRV_PCM_TRIGGER_SUSPEND:
2353                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2354                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2355                         break;
2356                 default:
2357                         ret = -EINVAL;
2358                         break;
2359                 }
2360                 break;
2361         case SND_SOC_DPCM_TRIGGER_POST:
2362                 switch (cmd) {
2363                 case SNDRV_PCM_TRIGGER_START:
2364                 case SNDRV_PCM_TRIGGER_RESUME:
2365                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2366                         ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2367                         break;
2368                 case SNDRV_PCM_TRIGGER_STOP:
2369                 case SNDRV_PCM_TRIGGER_SUSPEND:
2370                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2371                         ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2372                         break;
2373                 default:
2374                         ret = -EINVAL;
2375                         break;
2376                 }
2377                 break;
2378         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2379                 /* bespoke trigger() - handles both FE and BEs */
2380 
2381                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2382                                 fe->dai_link->name, cmd);
2383 
2384                 ret = soc_pcm_bespoke_trigger(substream, cmd);
2385                 break;
2386         default:
2387                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2388                                 fe->dai_link->name);
2389                 ret = -EINVAL;
2390                 goto out;
2391         }
2392 
2393         if (ret < 0) {
2394                 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2395                         cmd, ret);
2396                 goto out;
2397         }
2398 
2399         switch (cmd) {
2400         case SNDRV_PCM_TRIGGER_START:
2401         case SNDRV_PCM_TRIGGER_RESUME:
2402         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2403                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2404                 break;
2405         case SNDRV_PCM_TRIGGER_STOP:
2406         case SNDRV_PCM_TRIGGER_SUSPEND:
2407                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2408                 break;
2409         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2410                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2411                 break;
2412         }
2413 
2414 out:
2415         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2416         return ret;
2417 }
2418 
2419 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2420 {
2421         struct snd_soc_pcm_runtime *fe = substream->private_data;
2422         int stream = substream->stream;
2423 
2424         /* if FE's runtime_update is already set, we're in race;
2425          * process this trigger later at exit
2426          */
2427         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2428                 fe->dpcm[stream].trigger_pending = cmd + 1;
2429                 return 0; /* delayed, assuming it's successful */
2430         }
2431 
2432         /* we're alone, let's trigger */
2433         return dpcm_fe_dai_do_trigger(substream, cmd);
2434 }
2435 
2436 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2437 {
2438         struct snd_soc_dpcm *dpcm;
2439         int ret = 0;
2440 
2441         for_each_dpcm_be(fe, stream, dpcm) {
2442 
2443                 struct snd_soc_pcm_runtime *be = dpcm->be;
2444                 struct snd_pcm_substream *be_substream =
2445                         snd_soc_dpcm_get_substream(be, stream);
2446 
2447                 /* is this op for this BE ? */
2448                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2449                         continue;
2450 
2451                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2452                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2453                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2454                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2455                         continue;
2456 
2457                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2458                         be->dai_link->name);
2459 
2460                 ret = soc_pcm_prepare(be_substream);
2461                 if (ret < 0) {
2462                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2463                                 ret);
2464                         break;
2465                 }
2466 
2467                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2468         }
2469         return ret;
2470 }
2471 
2472 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2473 {
2474         struct snd_soc_pcm_runtime *fe = substream->private_data;
2475         int stream = substream->stream, ret = 0;
2476 
2477         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2478 
2479         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2480 
2481         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2482 
2483         /* there is no point preparing this FE if there are no BEs */
2484         if (list_empty(&fe->dpcm[stream].be_clients)) {
2485                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2486                                 fe->dai_link->name);
2487                 ret = -EINVAL;
2488                 goto out;
2489         }
2490 
2491         ret = dpcm_be_dai_prepare(fe, substream->stream);
2492         if (ret < 0)
2493                 goto out;
2494 
2495         /* call prepare on the frontend */
2496         ret = soc_pcm_prepare(substream);
2497         if (ret < 0) {
2498                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2499                         fe->dai_link->name);
2500                 goto out;
2501         }
2502 
2503         /* run the stream event for each BE */
2504         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2505         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2506 
2507 out:
2508         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2509         mutex_unlock(&fe->card->mutex);
2510 
2511         return ret;
2512 }
2513 
2514 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2515 {
2516         struct snd_pcm_substream *substream =
2517                 snd_soc_dpcm_get_substream(fe, stream);
2518         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2519         int err;
2520 
2521         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2522                         stream ? "capture" : "playback", fe->dai_link->name);
2523 
2524         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2525                 /* call bespoke trigger - FE takes care of all BE triggers */
2526                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2527                                 fe->dai_link->name);
2528 
2529                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2530                 if (err < 0)
2531                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2532         } else {
2533                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2534                         fe->dai_link->name);
2535 
2536                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2537                 if (err < 0)
2538                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2539         }
2540 
2541         err = dpcm_be_dai_hw_free(fe, stream);
2542         if (err < 0)
2543                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2544 
2545         err = dpcm_be_dai_shutdown(fe, stream);
2546         if (err < 0)
2547                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2548 
2549         /* run the stream event for each BE */
2550         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2551 
2552         return 0;
2553 }
2554 
2555 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2556 {
2557         struct snd_pcm_substream *substream =
2558                 snd_soc_dpcm_get_substream(fe, stream);
2559         struct snd_soc_dpcm *dpcm;
2560         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2561         int ret;
2562         unsigned long flags;
2563 
2564         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2565                         stream ? "capture" : "playback", fe->dai_link->name);
2566 
2567         /* Only start the BE if the FE is ready */
2568         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2569                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2570                 return -EINVAL;
2571 
2572         /* startup must always be called for new BEs */
2573         ret = dpcm_be_dai_startup(fe, stream);
2574         if (ret < 0)
2575                 goto disconnect;
2576 
2577         /* keep going if FE state is > open */
2578         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2579                 return 0;
2580 
2581         ret = dpcm_be_dai_hw_params(fe, stream);
2582         if (ret < 0)
2583                 goto close;
2584 
2585         /* keep going if FE state is > hw_params */
2586         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2587                 return 0;
2588 
2589 
2590         ret = dpcm_be_dai_prepare(fe, stream);
2591         if (ret < 0)
2592                 goto hw_free;
2593 
2594         /* run the stream event for each BE */
2595         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2596 
2597         /* keep going if FE state is > prepare */
2598         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2599                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2600                 return 0;
2601 
2602         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2603                 /* call trigger on the frontend - FE takes care of all BE triggers */
2604                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2605                                 fe->dai_link->name);
2606 
2607                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2608                 if (ret < 0) {
2609                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2610                         goto hw_free;
2611                 }
2612         } else {
2613                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2614                         fe->dai_link->name);
2615 
2616                 ret = dpcm_be_dai_trigger(fe, stream,
2617                                         SNDRV_PCM_TRIGGER_START);
2618                 if (ret < 0) {
2619                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2620                         goto hw_free;
2621                 }
2622         }
2623 
2624         return 0;
2625 
2626 hw_free:
2627         dpcm_be_dai_hw_free(fe, stream);
2628 close:
2629         dpcm_be_dai_shutdown(fe, stream);
2630 disconnect:
2631         /* disconnect any non started BEs */
2632         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
2633         for_each_dpcm_be(fe, stream, dpcm) {
2634                 struct snd_soc_pcm_runtime *be = dpcm->be;
2635                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2636                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2637         }
2638         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
2639 
2640         return ret;
2641 }
2642 
2643 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2644 {
2645         int ret;
2646 
2647         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2648         ret = dpcm_run_update_startup(fe, stream);
2649         if (ret < 0)
2650                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2651         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2652 
2653         return ret;
2654 }
2655 
2656 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2657 {
2658         int ret;
2659 
2660         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2661         ret = dpcm_run_update_shutdown(fe, stream);
2662         if (ret < 0)
2663                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2664         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2665 
2666         return ret;
2667 }
2668 
2669 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2670 {
2671         struct snd_soc_dapm_widget_list *list;
2672         int count, paths;
2673 
2674         if (!fe->dai_link->dynamic)
2675                 return 0;
2676 
2677         /* only check active links */
2678         if (!fe->cpu_dai->active)
2679                 return 0;
2680 
2681         /* DAPM sync will call this to update DSP paths */
2682         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2683                 new ? "new" : "old", fe->dai_link->name);
2684 
2685         /* skip if FE doesn't have playback capability */
2686         if (!snd_soc_dai_stream_valid(fe->cpu_dai,   SNDRV_PCM_STREAM_PLAYBACK) ||
2687             !snd_soc_dai_stream_valid(fe->codec_dai, SNDRV_PCM_STREAM_PLAYBACK))
2688                 goto capture;
2689 
2690         /* skip if FE isn't currently playing */
2691         if (!fe->cpu_dai->playback_active || !fe->codec_dai->playback_active)
2692                 goto capture;
2693 
2694         paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2695         if (paths < 0) {
2696                 dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2697                          fe->dai_link->name,  "playback");
2698                 return paths;
2699         }
2700 
2701         /* update any playback paths */
2702         count = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, new);
2703         if (count) {
2704                 if (new)
2705                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2706                 else
2707                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2708 
2709                 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2710                 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2711         }
2712 
2713         dpcm_path_put(&list);
2714 
2715 capture:
2716         /* skip if FE doesn't have capture capability */
2717         if (!snd_soc_dai_stream_valid(fe->cpu_dai,   SNDRV_PCM_STREAM_CAPTURE) ||
2718             !snd_soc_dai_stream_valid(fe->codec_dai, SNDRV_PCM_STREAM_CAPTURE))
2719                 return 0;
2720 
2721         /* skip if FE isn't currently capturing */
2722         if (!fe->cpu_dai->capture_active || !fe->codec_dai->capture_active)
2723                 return 0;
2724 
2725         paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2726         if (paths < 0) {
2727                 dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2728                          fe->dai_link->name,  "capture");
2729                 return paths;
2730         }
2731 
2732         /* update any old capture paths */
2733         count = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, new);
2734         if (count) {
2735                 if (new)
2736                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2737                 else
2738                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2739 
2740                 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2741                 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2742         }
2743 
2744         dpcm_path_put(&list);
2745 
2746         return 0;
2747 }
2748 
2749 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2750  * any DAI links.
2751  */
2752 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2753 {
2754         struct snd_soc_pcm_runtime *fe;
2755         int ret = 0;
2756 
2757         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2758         /* shutdown all old paths first */
2759         for_each_card_rtds(card, fe) {
2760                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2761                 if (ret)
2762                         goto out;
2763         }
2764 
2765         /* bring new paths up */
2766         for_each_card_rtds(card, fe) {
2767                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2768                 if (ret)
2769                         goto out;
2770         }
2771 
2772 out:
2773         mutex_unlock(&card->mutex);
2774         return ret;
2775 }
2776 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2777 {
2778         struct snd_soc_dpcm *dpcm;
2779         struct snd_soc_dai *dai;
2780 
2781         for_each_dpcm_be(fe, SNDRV_PCM_STREAM_PLAYBACK, dpcm) {
2782 
2783                 struct snd_soc_pcm_runtime *be = dpcm->be;
2784                 int i;
2785 
2786                 if (be->dai_link->ignore_suspend)
2787                         continue;
2788 
2789                 for_each_rtd_codec_dai(be, i, dai) {
2790                         struct snd_soc_dai_driver *drv = dai->driver;
2791 
2792                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2793                                          be->dai_link->name);
2794 
2795                         if (drv->ops && drv->ops->digital_mute &&
2796                                                         dai->playback_active)
2797                                 drv->ops->digital_mute(dai, mute);
2798                 }
2799         }
2800 
2801         return 0;
2802 }
2803 
2804 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2805 {
2806         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2807         struct snd_soc_dpcm *dpcm;
2808         struct snd_soc_dapm_widget_list *list;
2809         int ret;
2810         int stream = fe_substream->stream;
2811 
2812         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2813         fe->dpcm[stream].runtime = fe_substream->runtime;
2814 
2815         ret = dpcm_path_get(fe, stream, &list);
2816         if (ret < 0) {
2817                 mutex_unlock(&fe->card->mutex);
2818                 return ret;
2819         } else if (ret == 0) {
2820                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2821                         fe->dai_link->name, stream ? "capture" : "playback");
2822         }
2823 
2824         /* calculate valid and active FE <-> BE dpcms */
2825         dpcm_process_paths(fe, stream, &list, 1);
2826 
2827         ret = dpcm_fe_dai_startup(fe_substream);
2828         if (ret < 0) {
2829                 /* clean up all links */
2830                 for_each_dpcm_be(fe, stream, dpcm)
2831                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2832 
2833                 dpcm_be_disconnect(fe, stream);
2834                 fe->dpcm[stream].runtime = NULL;
2835         }
2836 
2837         dpcm_clear_pending_state(fe, stream);
2838         dpcm_path_put(&list);
2839         mutex_unlock(&fe->card->mutex);
2840         return ret;
2841 }
2842 
2843 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2844 {
2845         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2846         struct snd_soc_dpcm *dpcm;
2847         int stream = fe_substream->stream, ret;
2848 
2849         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2850         ret = dpcm_fe_dai_shutdown(fe_substream);
2851 
2852         /* mark FE's links ready to prune */
2853         for_each_dpcm_be(fe, stream, dpcm)
2854                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2855 
2856         dpcm_be_disconnect(fe, stream);
2857 
2858         fe->dpcm[stream].runtime = NULL;
2859         mutex_unlock(&fe->card->mutex);
2860         return ret;
2861 }
2862 
2863 static void soc_pcm_private_free(struct snd_pcm *pcm)
2864 {
2865         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
2866 
2867         /* need to sync the delayed work before releasing resources */
2868         flush_delayed_work(&rtd->delayed_work);
2869         snd_soc_pcm_component_free(pcm);
2870 }
2871 
2872 /* create a new pcm */
2873 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2874 {
2875         struct snd_soc_dai *codec_dai;
2876         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2877         struct snd_soc_rtdcom_list *rtdcom;
2878         struct snd_pcm *pcm;
2879         char new_name[64];
2880         int ret = 0, playback = 0, capture = 0;
2881         int i;
2882 
2883         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2884                 playback = rtd->dai_link->dpcm_playback;
2885                 capture = rtd->dai_link->dpcm_capture;
2886         } else {
2887                 /* Adapt stream for codec2codec links */
2888                 struct snd_soc_pcm_stream *cpu_capture = rtd->dai_link->params ?
2889                         &cpu_dai->driver->playback : &cpu_dai->driver->capture;
2890                 struct snd_soc_pcm_stream *cpu_playback = rtd->dai_link->params ?
2891                         &cpu_dai->driver->capture : &cpu_dai->driver->playback;
2892 
2893                 for_each_rtd_codec_dai(rtd, i, codec_dai) {
2894                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2895                             snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_PLAYBACK))
2896                                 playback = 1;
2897                         if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2898                             snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_CAPTURE))
2899                                 capture = 1;
2900                 }
2901 
2902                 capture = capture && cpu_capture->channels_min;
2903                 playback = playback && cpu_playback->channels_min;
2904         }
2905 
2906         if (rtd->dai_link->playback_only) {
2907                 playback = 1;
2908                 capture = 0;
2909         }
2910 
2911         if (rtd->dai_link->capture_only) {
2912                 playback = 0;
2913                 capture = 1;
2914         }
2915 
2916         /* create the PCM */
2917         if (rtd->dai_link->params) {
2918                 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2919                          rtd->dai_link->stream_name);
2920 
2921                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2922                                            playback, capture, &pcm);
2923         } else if (rtd->dai_link->no_pcm) {
2924                 snprintf(new_name, sizeof(new_name), "(%s)",
2925                         rtd->dai_link->stream_name);
2926 
2927                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2928                                 playback, capture, &pcm);
2929         } else {
2930                 if (rtd->dai_link->dynamic)
2931                         snprintf(new_name, sizeof(new_name), "%s (*)",
2932                                 rtd->dai_link->stream_name);
2933                 else
2934                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2935                                 rtd->dai_link->stream_name,
2936                                 (rtd->num_codecs > 1) ?
2937                                 "multicodec" : rtd->codec_dai->name, num);
2938 
2939                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2940                         capture, &pcm);
2941         }
2942         if (ret < 0) {
2943                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2944                         rtd->dai_link->name);
2945                 return ret;
2946         }
2947         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2948 
2949         /* DAPM dai link stream work */
2950         if (rtd->dai_link->params)
2951                 INIT_DELAYED_WORK(&rtd->delayed_work,
2952                                   codec2codec_close_delayed_work);
2953         else
2954                 INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2955 
2956         pcm->nonatomic = rtd->dai_link->nonatomic;
2957         rtd->pcm = pcm;
2958         pcm->private_data = rtd;
2959 
2960         if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
2961                 if (playback)
2962                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2963                 if (capture)
2964                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2965                 goto out;
2966         }
2967 
2968         /* ASoC PCM operations */
2969         if (rtd->dai_link->dynamic) {
2970                 rtd->ops.open           = dpcm_fe_dai_open;
2971                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2972                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2973                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2974                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2975                 rtd->ops.close          = dpcm_fe_dai_close;
2976                 rtd->ops.pointer        = soc_pcm_pointer;
2977                 rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2978         } else {
2979                 rtd->ops.open           = soc_pcm_open;
2980                 rtd->ops.hw_params      = soc_pcm_hw_params;
2981                 rtd->ops.prepare        = soc_pcm_prepare;
2982                 rtd->ops.trigger        = soc_pcm_trigger;
2983                 rtd->ops.hw_free        = soc_pcm_hw_free;
2984                 rtd->ops.close          = soc_pcm_close;
2985                 rtd->ops.pointer        = soc_pcm_pointer;
2986                 rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
2987         }
2988 
2989         for_each_rtdcom(rtd, rtdcom) {
2990                 const struct snd_pcm_ops *ops = rtdcom->component->driver->ops;
2991 
2992                 if (!ops)
2993                         continue;
2994 
2995                 if (ops->copy_user)
2996                         rtd->ops.copy_user      = snd_soc_pcm_component_copy_user;
2997                 if (ops->page)
2998                         rtd->ops.page           = snd_soc_pcm_component_page;
2999                 if (ops->mmap)
3000                         rtd->ops.mmap           = snd_soc_pcm_component_mmap;
3001         }
3002 
3003         if (playback)
3004                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
3005 
3006         if (capture)
3007                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
3008 
3009         ret = snd_soc_pcm_component_new(pcm);
3010         if (ret < 0) {
3011                 dev_err(rtd->dev, "ASoC: pcm constructor failed: %d\n", ret);
3012                 return ret;
3013         }
3014 
3015         pcm->private_free = soc_pcm_private_free;
3016         pcm->no_device_suspend = true;
3017 out:
3018         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
3019                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
3020                  cpu_dai->name);
3021         return ret;
3022 }
3023 
3024 /* is the current PCM operation for this FE ? */
3025 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
3026 {
3027         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
3028                 return 1;
3029         return 0;
3030 }
3031 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
3032 
3033 /* is the current PCM operation for this BE ? */
3034 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
3035                 struct snd_soc_pcm_runtime *be, int stream)
3036 {
3037         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
3038            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
3039                   be->dpcm[stream].runtime_update))
3040                 return 1;
3041         return 0;
3042 }
3043 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
3044 
3045 /* get the substream for this BE */
3046 struct snd_pcm_substream *
3047         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
3048 {
3049         return be->pcm->streams[stream].substream;
3050 }
3051 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
3052 
3053 /* get the BE runtime state */
3054 enum snd_soc_dpcm_state
3055         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
3056 {
3057         return be->dpcm[stream].state;
3058 }
3059 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
3060 
3061 /* set the BE runtime state */
3062 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
3063                 int stream, enum snd_soc_dpcm_state state)
3064 {
3065         be->dpcm[stream].state = state;
3066 }
3067 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
3068 
3069 /*
3070  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3071  * are not running, paused or suspended for the specified stream direction.
3072  */
3073 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3074                 struct snd_soc_pcm_runtime *be, int stream)
3075 {
3076         struct snd_soc_dpcm *dpcm;
3077         int state;
3078         int ret = 1;
3079         unsigned long flags;
3080 
3081         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
3082         for_each_dpcm_fe(be, stream, dpcm) {
3083 
3084                 if (dpcm->fe == fe)
3085                         continue;
3086 
3087                 state = dpcm->fe->dpcm[stream].state;
3088                 if (state == SND_SOC_DPCM_STATE_START ||
3089                         state == SND_SOC_DPCM_STATE_PAUSED ||
3090                         state == SND_SOC_DPCM_STATE_SUSPEND) {
3091                         ret = 0;
3092                         break;
3093                 }
3094         }
3095         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
3096 
3097         /* it's safe to free/stop this BE DAI */
3098         return ret;
3099 }
3100 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3101 
3102 /*
3103  * We can only change hw params a BE DAI if any of it's FE are not prepared,
3104  * running, paused or suspended for the specified stream direction.
3105  */
3106 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3107                 struct snd_soc_pcm_runtime *be, int stream)
3108 {
3109         struct snd_soc_dpcm *dpcm;
3110         int state;
3111         int ret = 1;
3112         unsigned long flags;
3113 
3114         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
3115         for_each_dpcm_fe(be, stream, dpcm) {
3116 
3117                 if (dpcm->fe == fe)
3118                         continue;
3119 
3120                 state = dpcm->fe->dpcm[stream].state;
3121                 if (state == SND_SOC_DPCM_STATE_START ||
3122                         state == SND_SOC_DPCM_STATE_PAUSED ||
3123                         state == SND_SOC_DPCM_STATE_SUSPEND ||
3124                         state == SND_SOC_DPCM_STATE_PREPARE) {
3125                         ret = 0;
3126                         break;
3127                 }
3128         }
3129         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
3130 
3131         /* it's safe to change hw_params */
3132         return ret;
3133 }
3134 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
3135 
3136 #ifdef CONFIG_DEBUG_FS
3137 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
3138 {
3139         switch (state) {
3140         case SND_SOC_DPCM_STATE_NEW:
3141                 return "new";
3142         case SND_SOC_DPCM_STATE_OPEN:
3143                 return "open";
3144         case SND_SOC_DPCM_STATE_HW_PARAMS:
3145                 return "hw_params";
3146         case SND_SOC_DPCM_STATE_PREPARE:
3147                 return "prepare";
3148         case SND_SOC_DPCM_STATE_START:
3149                 return "start";
3150         case SND_SOC_DPCM_STATE_STOP:
3151                 return "stop";
3152         case SND_SOC_DPCM_STATE_SUSPEND:
3153                 return "suspend";
3154         case SND_SOC_DPCM_STATE_PAUSED:
3155                 return "paused";
3156         case SND_SOC_DPCM_STATE_HW_FREE:
3157                 return "hw_free";
3158         case SND_SOC_DPCM_STATE_CLOSE:
3159                 return "close";
3160         }
3161 
3162         return "unknown";
3163 }
3164 
3165 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
3166                                 int stream, char *buf, size_t size)
3167 {
3168         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
3169         struct snd_soc_dpcm *dpcm;
3170         ssize_t offset = 0;
3171         unsigned long flags;
3172 
3173         /* FE state */
3174         offset += scnprintf(buf + offset, size - offset,
3175                         "[%s - %s]\n", fe->dai_link->name,
3176                         stream ? "Capture" : "Playback");
3177 
3178         offset += scnprintf(buf + offset, size - offset, "State: %s\n",
3179                         dpcm_state_string(fe->dpcm[stream].state));
3180 
3181         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
3182             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
3183                 offset += scnprintf(buf + offset, size - offset,
3184                                 "Hardware Params: "
3185                                 "Format = %s, Channels = %d, Rate = %d\n",
3186                                 snd_pcm_format_name(params_format(params)),
3187                                 params_channels(params),
3188                                 params_rate(params));
3189 
3190         /* BEs state */
3191         offset += scnprintf(buf + offset, size - offset, "Backends:\n");
3192 
3193         if (list_empty(&fe->dpcm[stream].be_clients)) {
3194                 offset += scnprintf(buf + offset, size - offset,
3195                                 " No active DSP links\n");
3196                 goto out;
3197         }
3198 
3199         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
3200         for_each_dpcm_be(fe, stream, dpcm) {
3201                 struct snd_soc_pcm_runtime *be = dpcm->be;
3202                 params = &dpcm->hw_params;
3203 
3204                 offset += scnprintf(buf + offset, size - offset,
3205                                 "- %s\n", be->dai_link->name);
3206 
3207                 offset += scnprintf(buf + offset, size - offset,
3208                                 "   State: %s\n",
3209                                 dpcm_state_string(be->dpcm[stream].state));
3210 
3211                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
3212                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
3213                         offset += scnprintf(buf + offset, size - offset,
3214                                 "   Hardware Params: "
3215                                 "Format = %s, Channels = %d, Rate = %d\n",
3216                                 snd_pcm_format_name(params_format(params)),
3217                                 params_channels(params),
3218                                 params_rate(params));
3219         }
3220         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
3221 out:
3222         return offset;
3223 }
3224 
3225 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
3226                                 size_t count, loff_t *ppos)
3227 {
3228         struct snd_soc_pcm_runtime *fe = file->private_data;
3229         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
3230         char *buf;
3231 
3232         buf = kmalloc(out_count, GFP_KERNEL);
3233         if (!buf)
3234                 return -ENOMEM;
3235 
3236         if (snd_soc_dai_stream_valid(fe->cpu_dai, SNDRV_PCM_STREAM_PLAYBACK))
3237                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
3238                                         buf + offset, out_count - offset);
3239 
3240         if (snd_soc_dai_stream_valid(fe->cpu_dai, SNDRV_PCM_STREAM_CAPTURE))
3241                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
3242                                         buf + offset, out_count - offset);
3243 
3244         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
3245 
3246         kfree(buf);
3247         return ret;
3248 }
3249 
3250 static const struct file_operations dpcm_state_fops = {
3251         .open = simple_open,
3252         .read = dpcm_state_read_file,
3253         .llseek = default_llseek,
3254 };
3255 
3256 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
3257 {
3258         if (!rtd->dai_link)
3259                 return;
3260 
3261         if (!rtd->dai_link->dynamic)
3262                 return;
3263 
3264         if (!rtd->card->debugfs_card_root)
3265                 return;
3266 
3267         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
3268                         rtd->card->debugfs_card_root);
3269 
3270         debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
3271                             rtd, &dpcm_state_fops);
3272 }
3273 #endif
/* [<][>][^][v][top][bottom][index][help] */
root/sound/soc/soc-pcm.c

DEFINITIONS
