1 /* 2 * soc-pcm.c -- ALSA SoC PCM 3 * 4 * Copyright 2005 Wolfson Microelectronics PLC. 5 * Copyright 2005 Openedhand Ltd. 6 * Copyright (C) 2010 Slimlogic Ltd. 7 * Copyright (C) 2010 Texas Instruments Inc. 8 * 9 * Authors: Liam Girdwood <lrg@ti.com> 10 * Mark Brown <broonie@opensource.wolfsonmicro.com> 11 * 12 * This program is free software; you can redistribute it and/or modify it 13 * under the terms of the GNU General Public License as published by the 14 * Free Software Foundation; either version 2 of the License, or (at your 15 * option) any later version. 16 * 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/init.h> 21 #include <linux/delay.h> 22 #include <linux/pinctrl/consumer.h> 23 #include <linux/pm_runtime.h> 24 #include <linux/slab.h> 25 #include <linux/workqueue.h> 26 #include <linux/export.h> 27 #include <linux/debugfs.h> 28 #include <sound/core.h> 29 #include <sound/pcm.h> 30 #include <sound/pcm_params.h> 31 #include <sound/soc.h> 32 #include <sound/soc-dpcm.h> 33 #include <sound/initval.h> 34 35 #define DPCM_MAX_BE_USERS 8 36 37 /* 38 * snd_soc_dai_stream_valid() - check if a DAI supports the given stream 39 * 40 * Returns true if the DAI supports the indicated stream type. 41 */ 42 static bool snd_soc_dai_stream_valid(struct snd_soc_dai *dai, int stream) 43 { 44 struct snd_soc_pcm_stream *codec_stream; 45 46 if (stream == SNDRV_PCM_STREAM_PLAYBACK) 47 codec_stream = &dai->driver->playback; 48 else 49 codec_stream = &dai->driver->capture; 50 51 /* If the codec specifies any rate at all, it supports the stream. */ 52 return codec_stream->rates; 53 } 54 55 /** 56 * snd_soc_runtime_activate() - Increment active count for PCM runtime components 57 * @rtd: ASoC PCM runtime that is activated 58 * @stream: Direction of the PCM stream 59 * 60 * Increments the active count for all the DAIs and components attached to a PCM 61 * runtime. Should typically be called when a stream is opened. 62 * 63 * Must be called with the rtd->pcm_mutex being held 64 */ 65 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream) 66 { 67 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 68 int i; 69 70 lockdep_assert_held(&rtd->pcm_mutex); 71 72 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 73 cpu_dai->playback_active++; 74 for (i = 0; i < rtd->num_codecs; i++) 75 rtd->codec_dais[i]->playback_active++; 76 } else { 77 cpu_dai->capture_active++; 78 for (i = 0; i < rtd->num_codecs; i++) 79 rtd->codec_dais[i]->capture_active++; 80 } 81 82 cpu_dai->active++; 83 cpu_dai->component->active++; 84 for (i = 0; i < rtd->num_codecs; i++) { 85 rtd->codec_dais[i]->active++; 86 rtd->codec_dais[i]->component->active++; 87 } 88 } 89 90 /** 91 * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components 92 * @rtd: ASoC PCM runtime that is deactivated 93 * @stream: Direction of the PCM stream 94 * 95 * Decrements the active count for all the DAIs and components attached to a PCM 96 * runtime. Should typically be called when a stream is closed. 97 * 98 * Must be called with the rtd->pcm_mutex being held 99 */ 100 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream) 101 { 102 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 103 int i; 104 105 lockdep_assert_held(&rtd->pcm_mutex); 106 107 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 108 cpu_dai->playback_active--; 109 for (i = 0; i < rtd->num_codecs; i++) 110 rtd->codec_dais[i]->playback_active--; 111 } else { 112 cpu_dai->capture_active--; 113 for (i = 0; i < rtd->num_codecs; i++) 114 rtd->codec_dais[i]->capture_active--; 115 } 116 117 cpu_dai->active--; 118 cpu_dai->component->active--; 119 for (i = 0; i < rtd->num_codecs; i++) { 120 rtd->codec_dais[i]->component->active--; 121 rtd->codec_dais[i]->active--; 122 } 123 } 124 125 /** 126 * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay 127 * @rtd: The ASoC PCM runtime that should be checked. 128 * 129 * This function checks whether the power down delay should be ignored for a 130 * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has 131 * been configured to ignore the delay, or if none of the components benefits 132 * from having the delay. 133 */ 134 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd) 135 { 136 int i; 137 bool ignore = true; 138 139 if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time) 140 return true; 141 142 for (i = 0; i < rtd->num_codecs; i++) 143 ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time; 144 145 return rtd->cpu_dai->component->ignore_pmdown_time && ignore; 146 } 147 148 /** 149 * snd_soc_set_runtime_hwparams - set the runtime hardware parameters 150 * @substream: the pcm substream 151 * @hw: the hardware parameters 152 * 153 * Sets the substream runtime hardware parameters. 154 */ 155 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream, 156 const struct snd_pcm_hardware *hw) 157 { 158 struct snd_pcm_runtime *runtime = substream->runtime; 159 runtime->hw.info = hw->info; 160 runtime->hw.formats = hw->formats; 161 runtime->hw.period_bytes_min = hw->period_bytes_min; 162 runtime->hw.period_bytes_max = hw->period_bytes_max; 163 runtime->hw.periods_min = hw->periods_min; 164 runtime->hw.periods_max = hw->periods_max; 165 runtime->hw.buffer_bytes_max = hw->buffer_bytes_max; 166 runtime->hw.fifo_size = hw->fifo_size; 167 return 0; 168 } 169 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams); 170 171 /* DPCM stream event, send event to FE and all active BEs. */ 172 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir, 173 int event) 174 { 175 struct snd_soc_dpcm *dpcm; 176 177 list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) { 178 179 struct snd_soc_pcm_runtime *be = dpcm->be; 180 181 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n", 182 be->dai_link->name, event, dir); 183 184 snd_soc_dapm_stream_event(be, dir, event); 185 } 186 187 snd_soc_dapm_stream_event(fe, dir, event); 188 189 return 0; 190 } 191 192 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream, 193 struct snd_soc_dai *soc_dai) 194 { 195 struct snd_soc_pcm_runtime *rtd = substream->private_data; 196 int ret; 197 198 if (soc_dai->rate && (soc_dai->driver->symmetric_rates || 199 rtd->dai_link->symmetric_rates)) { 200 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n", 201 soc_dai->rate); 202 203 ret = snd_pcm_hw_constraint_single(substream->runtime, 204 SNDRV_PCM_HW_PARAM_RATE, 205 soc_dai->rate); 206 if (ret < 0) { 207 dev_err(soc_dai->dev, 208 "ASoC: Unable to apply rate constraint: %d\n", 209 ret); 210 return ret; 211 } 212 } 213 214 if (soc_dai->channels && (soc_dai->driver->symmetric_channels || 215 rtd->dai_link->symmetric_channels)) { 216 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n", 217 soc_dai->channels); 218 219 ret = snd_pcm_hw_constraint_single(substream->runtime, 220 SNDRV_PCM_HW_PARAM_CHANNELS, 221 soc_dai->channels); 222 if (ret < 0) { 223 dev_err(soc_dai->dev, 224 "ASoC: Unable to apply channel symmetry constraint: %d\n", 225 ret); 226 return ret; 227 } 228 } 229 230 if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits || 231 rtd->dai_link->symmetric_samplebits)) { 232 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n", 233 soc_dai->sample_bits); 234 235 ret = snd_pcm_hw_constraint_single(substream->runtime, 236 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 237 soc_dai->sample_bits); 238 if (ret < 0) { 239 dev_err(soc_dai->dev, 240 "ASoC: Unable to apply sample bits symmetry constraint: %d\n", 241 ret); 242 return ret; 243 } 244 } 245 246 return 0; 247 } 248 249 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream, 250 struct snd_pcm_hw_params *params) 251 { 252 struct snd_soc_pcm_runtime *rtd = substream->private_data; 253 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 254 unsigned int rate, channels, sample_bits, symmetry, i; 255 256 rate = params_rate(params); 257 channels = params_channels(params); 258 sample_bits = snd_pcm_format_physical_width(params_format(params)); 259 260 /* reject unmatched parameters when applying symmetry */ 261 symmetry = cpu_dai->driver->symmetric_rates || 262 rtd->dai_link->symmetric_rates; 263 264 for (i = 0; i < rtd->num_codecs; i++) 265 symmetry |= rtd->codec_dais[i]->driver->symmetric_rates; 266 267 if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) { 268 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n", 269 cpu_dai->rate, rate); 270 return -EINVAL; 271 } 272 273 symmetry = cpu_dai->driver->symmetric_channels || 274 rtd->dai_link->symmetric_channels; 275 276 for (i = 0; i < rtd->num_codecs; i++) 277 symmetry |= rtd->codec_dais[i]->driver->symmetric_channels; 278 279 if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) { 280 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n", 281 cpu_dai->channels, channels); 282 return -EINVAL; 283 } 284 285 symmetry = cpu_dai->driver->symmetric_samplebits || 286 rtd->dai_link->symmetric_samplebits; 287 288 for (i = 0; i < rtd->num_codecs; i++) 289 symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits; 290 291 if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) { 292 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n", 293 cpu_dai->sample_bits, sample_bits); 294 return -EINVAL; 295 } 296 297 return 0; 298 } 299 300 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream) 301 { 302 struct snd_soc_pcm_runtime *rtd = substream->private_data; 303 struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver; 304 struct snd_soc_dai_link *link = rtd->dai_link; 305 unsigned int symmetry, i; 306 307 symmetry = cpu_driver->symmetric_rates || link->symmetric_rates || 308 cpu_driver->symmetric_channels || link->symmetric_channels || 309 cpu_driver->symmetric_samplebits || link->symmetric_samplebits; 310 311 for (i = 0; i < rtd->num_codecs; i++) 312 symmetry = symmetry || 313 rtd->codec_dais[i]->driver->symmetric_rates || 314 rtd->codec_dais[i]->driver->symmetric_channels || 315 rtd->codec_dais[i]->driver->symmetric_samplebits; 316 317 return symmetry; 318 } 319 320 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits) 321 { 322 struct snd_soc_pcm_runtime *rtd = substream->private_data; 323 int ret; 324 325 if (!bits) 326 return; 327 328 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits); 329 if (ret != 0) 330 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n", 331 bits, ret); 332 } 333 334 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream) 335 { 336 struct snd_soc_pcm_runtime *rtd = substream->private_data; 337 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 338 struct snd_soc_dai *codec_dai; 339 int i; 340 unsigned int bits = 0, cpu_bits; 341 342 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 343 for (i = 0; i < rtd->num_codecs; i++) { 344 codec_dai = rtd->codec_dais[i]; 345 if (codec_dai->driver->playback.sig_bits == 0) { 346 bits = 0; 347 break; 348 } 349 bits = max(codec_dai->driver->playback.sig_bits, bits); 350 } 351 cpu_bits = cpu_dai->driver->playback.sig_bits; 352 } else { 353 for (i = 0; i < rtd->num_codecs; i++) { 354 codec_dai = rtd->codec_dais[i]; 355 if (codec_dai->driver->capture.sig_bits == 0) { 356 bits = 0; 357 break; 358 } 359 bits = max(codec_dai->driver->capture.sig_bits, bits); 360 } 361 cpu_bits = cpu_dai->driver->capture.sig_bits; 362 } 363 364 soc_pcm_set_msb(substream, bits); 365 soc_pcm_set_msb(substream, cpu_bits); 366 } 367 368 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream) 369 { 370 struct snd_pcm_runtime *runtime = substream->runtime; 371 struct snd_pcm_hardware *hw = &runtime->hw; 372 struct snd_soc_pcm_runtime *rtd = substream->private_data; 373 struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver; 374 struct snd_soc_dai_driver *codec_dai_drv; 375 struct snd_soc_pcm_stream *codec_stream; 376 struct snd_soc_pcm_stream *cpu_stream; 377 unsigned int chan_min = 0, chan_max = UINT_MAX; 378 unsigned int rate_min = 0, rate_max = UINT_MAX; 379 unsigned int rates = UINT_MAX; 380 u64 formats = ULLONG_MAX; 381 int i; 382 383 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 384 cpu_stream = &cpu_dai_drv->playback; 385 else 386 cpu_stream = &cpu_dai_drv->capture; 387 388 /* first calculate min/max only for CODECs in the DAI link */ 389 for (i = 0; i < rtd->num_codecs; i++) { 390 391 /* 392 * Skip CODECs which don't support the current stream type. 393 * Otherwise, since the rate, channel, and format values will 394 * zero in that case, we would have no usable settings left, 395 * causing the resulting setup to fail. 396 * At least one CODEC should match, otherwise we should have 397 * bailed out on a higher level, since there would be no 398 * CODEC to support the transfer direction in that case. 399 */ 400 if (!snd_soc_dai_stream_valid(rtd->codec_dais[i], 401 substream->stream)) 402 continue; 403 404 codec_dai_drv = rtd->codec_dais[i]->driver; 405 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 406 codec_stream = &codec_dai_drv->playback; 407 else 408 codec_stream = &codec_dai_drv->capture; 409 chan_min = max(chan_min, codec_stream->channels_min); 410 chan_max = min(chan_max, codec_stream->channels_max); 411 rate_min = max(rate_min, codec_stream->rate_min); 412 rate_max = min_not_zero(rate_max, codec_stream->rate_max); 413 formats &= codec_stream->formats; 414 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates); 415 } 416 417 /* 418 * chan min/max cannot be enforced if there are multiple CODEC DAIs 419 * connected to a single CPU DAI, use CPU DAI's directly and let 420 * channel allocation be fixed up later 421 */ 422 if (rtd->num_codecs > 1) { 423 chan_min = cpu_stream->channels_min; 424 chan_max = cpu_stream->channels_max; 425 } 426 427 hw->channels_min = max(chan_min, cpu_stream->channels_min); 428 hw->channels_max = min(chan_max, cpu_stream->channels_max); 429 if (hw->formats) 430 hw->formats &= formats & cpu_stream->formats; 431 else 432 hw->formats = formats & cpu_stream->formats; 433 hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates); 434 435 snd_pcm_limit_hw_rates(runtime); 436 437 hw->rate_min = max(hw->rate_min, cpu_stream->rate_min); 438 hw->rate_min = max(hw->rate_min, rate_min); 439 hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max); 440 hw->rate_max = min_not_zero(hw->rate_max, rate_max); 441 } 442 443 /* 444 * Called by ALSA when a PCM substream is opened, the runtime->hw record is 445 * then initialized and any private data can be allocated. This also calls 446 * startup for the cpu DAI, platform, machine and codec DAI. 447 */ 448 static int soc_pcm_open(struct snd_pcm_substream *substream) 449 { 450 struct snd_soc_pcm_runtime *rtd = substream->private_data; 451 struct snd_pcm_runtime *runtime = substream->runtime; 452 struct snd_soc_platform *platform = rtd->platform; 453 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 454 struct snd_soc_dai *codec_dai; 455 const char *codec_dai_name = "multicodec"; 456 int i, ret = 0; 457 458 pinctrl_pm_select_default_state(cpu_dai->dev); 459 for (i = 0; i < rtd->num_codecs; i++) 460 pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev); 461 pm_runtime_get_sync(cpu_dai->dev); 462 for (i = 0; i < rtd->num_codecs; i++) 463 pm_runtime_get_sync(rtd->codec_dais[i]->dev); 464 pm_runtime_get_sync(platform->dev); 465 466 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 467 468 /* startup the audio subsystem */ 469 if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) { 470 ret = cpu_dai->driver->ops->startup(substream, cpu_dai); 471 if (ret < 0) { 472 dev_err(cpu_dai->dev, "ASoC: can't open interface" 473 " %s: %d\n", cpu_dai->name, ret); 474 goto out; 475 } 476 } 477 478 if (platform->driver->ops && platform->driver->ops->open) { 479 ret = platform->driver->ops->open(substream); 480 if (ret < 0) { 481 dev_err(platform->dev, "ASoC: can't open platform" 482 " %s: %d\n", platform->component.name, ret); 483 goto platform_err; 484 } 485 } 486 487 for (i = 0; i < rtd->num_codecs; i++) { 488 codec_dai = rtd->codec_dais[i]; 489 if (codec_dai->driver->ops && codec_dai->driver->ops->startup) { 490 ret = codec_dai->driver->ops->startup(substream, 491 codec_dai); 492 if (ret < 0) { 493 dev_err(codec_dai->dev, 494 "ASoC: can't open codec %s: %d\n", 495 codec_dai->name, ret); 496 goto codec_dai_err; 497 } 498 } 499 500 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 501 codec_dai->tx_mask = 0; 502 else 503 codec_dai->rx_mask = 0; 504 } 505 506 if (rtd->dai_link->ops && rtd->dai_link->ops->startup) { 507 ret = rtd->dai_link->ops->startup(substream); 508 if (ret < 0) { 509 pr_err("ASoC: %s startup failed: %d\n", 510 rtd->dai_link->name, ret); 511 goto machine_err; 512 } 513 } 514 515 /* Dynamic PCM DAI links compat checks use dynamic capabilities */ 516 if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) 517 goto dynamic; 518 519 /* Check that the codec and cpu DAIs are compatible */ 520 soc_pcm_init_runtime_hw(substream); 521 522 if (rtd->num_codecs == 1) 523 codec_dai_name = rtd->codec_dai->name; 524 525 if (soc_pcm_has_symmetry(substream)) 526 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX; 527 528 ret = -EINVAL; 529 if (!runtime->hw.rates) { 530 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n", 531 codec_dai_name, cpu_dai->name); 532 goto config_err; 533 } 534 if (!runtime->hw.formats) { 535 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n", 536 codec_dai_name, cpu_dai->name); 537 goto config_err; 538 } 539 if (!runtime->hw.channels_min || !runtime->hw.channels_max || 540 runtime->hw.channels_min > runtime->hw.channels_max) { 541 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n", 542 codec_dai_name, cpu_dai->name); 543 goto config_err; 544 } 545 546 soc_pcm_apply_msb(substream); 547 548 /* Symmetry only applies if we've already got an active stream. */ 549 if (cpu_dai->active) { 550 ret = soc_pcm_apply_symmetry(substream, cpu_dai); 551 if (ret != 0) 552 goto config_err; 553 } 554 555 for (i = 0; i < rtd->num_codecs; i++) { 556 if (rtd->codec_dais[i]->active) { 557 ret = soc_pcm_apply_symmetry(substream, 558 rtd->codec_dais[i]); 559 if (ret != 0) 560 goto config_err; 561 } 562 } 563 564 pr_debug("ASoC: %s <-> %s info:\n", 565 codec_dai_name, cpu_dai->name); 566 pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates); 567 pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min, 568 runtime->hw.channels_max); 569 pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min, 570 runtime->hw.rate_max); 571 572 dynamic: 573 574 snd_soc_runtime_activate(rtd, substream->stream); 575 576 mutex_unlock(&rtd->pcm_mutex); 577 return 0; 578 579 config_err: 580 if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown) 581 rtd->dai_link->ops->shutdown(substream); 582 583 machine_err: 584 i = rtd->num_codecs; 585 586 codec_dai_err: 587 while (--i >= 0) { 588 codec_dai = rtd->codec_dais[i]; 589 if (codec_dai->driver->ops->shutdown) 590 codec_dai->driver->ops->shutdown(substream, codec_dai); 591 } 592 593 if (platform->driver->ops && platform->driver->ops->close) 594 platform->driver->ops->close(substream); 595 596 platform_err: 597 if (cpu_dai->driver->ops->shutdown) 598 cpu_dai->driver->ops->shutdown(substream, cpu_dai); 599 out: 600 mutex_unlock(&rtd->pcm_mutex); 601 602 pm_runtime_mark_last_busy(platform->dev); 603 pm_runtime_put_autosuspend(platform->dev); 604 for (i = 0; i < rtd->num_codecs; i++) { 605 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev); 606 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev); 607 } 608 609 pm_runtime_mark_last_busy(cpu_dai->dev); 610 pm_runtime_put_autosuspend(cpu_dai->dev); 611 for (i = 0; i < rtd->num_codecs; i++) { 612 if (!rtd->codec_dais[i]->active) 613 pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev); 614 } 615 if (!cpu_dai->active) 616 pinctrl_pm_select_sleep_state(cpu_dai->dev); 617 618 return ret; 619 } 620 621 /* 622 * Power down the audio subsystem pmdown_time msecs after close is called. 623 * This is to ensure there are no pops or clicks in between any music tracks 624 * due to DAPM power cycling. 625 */ 626 static void close_delayed_work(struct work_struct *work) 627 { 628 struct snd_soc_pcm_runtime *rtd = 629 container_of(work, struct snd_soc_pcm_runtime, delayed_work.work); 630 struct snd_soc_dai *codec_dai = rtd->codec_dais[0]; 631 632 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 633 634 dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n", 635 codec_dai->driver->playback.stream_name, 636 codec_dai->playback_active ? "active" : "inactive", 637 rtd->pop_wait ? "yes" : "no"); 638 639 /* are we waiting on this codec DAI stream */ 640 if (rtd->pop_wait == 1) { 641 rtd->pop_wait = 0; 642 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK, 643 SND_SOC_DAPM_STREAM_STOP); 644 } 645 646 mutex_unlock(&rtd->pcm_mutex); 647 } 648 649 /* 650 * Called by ALSA when a PCM substream is closed. Private data can be 651 * freed here. The cpu DAI, codec DAI, machine and platform are also 652 * shutdown. 653 */ 654 static int soc_pcm_close(struct snd_pcm_substream *substream) 655 { 656 struct snd_soc_pcm_runtime *rtd = substream->private_data; 657 struct snd_soc_platform *platform = rtd->platform; 658 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 659 struct snd_soc_dai *codec_dai; 660 int i; 661 662 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 663 664 snd_soc_runtime_deactivate(rtd, substream->stream); 665 666 /* clear the corresponding DAIs rate when inactive */ 667 if (!cpu_dai->active) 668 cpu_dai->rate = 0; 669 670 for (i = 0; i < rtd->num_codecs; i++) { 671 codec_dai = rtd->codec_dais[i]; 672 if (!codec_dai->active) 673 codec_dai->rate = 0; 674 } 675 676 snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream); 677 678 if (cpu_dai->driver->ops->shutdown) 679 cpu_dai->driver->ops->shutdown(substream, cpu_dai); 680 681 for (i = 0; i < rtd->num_codecs; i++) { 682 codec_dai = rtd->codec_dais[i]; 683 if (codec_dai->driver->ops->shutdown) 684 codec_dai->driver->ops->shutdown(substream, codec_dai); 685 } 686 687 if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown) 688 rtd->dai_link->ops->shutdown(substream); 689 690 if (platform->driver->ops && platform->driver->ops->close) 691 platform->driver->ops->close(substream); 692 693 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 694 if (snd_soc_runtime_ignore_pmdown_time(rtd)) { 695 /* powered down playback stream now */ 696 snd_soc_dapm_stream_event(rtd, 697 SNDRV_PCM_STREAM_PLAYBACK, 698 SND_SOC_DAPM_STREAM_STOP); 699 } else { 700 /* start delayed pop wq here for playback streams */ 701 rtd->pop_wait = 1; 702 queue_delayed_work(system_power_efficient_wq, 703 &rtd->delayed_work, 704 msecs_to_jiffies(rtd->pmdown_time)); 705 } 706 } else { 707 /* capture streams can be powered down now */ 708 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE, 709 SND_SOC_DAPM_STREAM_STOP); 710 } 711 712 mutex_unlock(&rtd->pcm_mutex); 713 714 pm_runtime_mark_last_busy(platform->dev); 715 pm_runtime_put_autosuspend(platform->dev); 716 717 for (i = 0; i < rtd->num_codecs; i++) { 718 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev); 719 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev); 720 } 721 722 pm_runtime_mark_last_busy(cpu_dai->dev); 723 pm_runtime_put_autosuspend(cpu_dai->dev); 724 725 for (i = 0; i < rtd->num_codecs; i++) { 726 if (!rtd->codec_dais[i]->active) 727 pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev); 728 } 729 if (!cpu_dai->active) 730 pinctrl_pm_select_sleep_state(cpu_dai->dev); 731 732 return 0; 733 } 734 735 /* 736 * Called by ALSA when the PCM substream is prepared, can set format, sample 737 * rate, etc. This function is non atomic and can be called multiple times, 738 * it can refer to the runtime info. 739 */ 740 static int soc_pcm_prepare(struct snd_pcm_substream *substream) 741 { 742 struct snd_soc_pcm_runtime *rtd = substream->private_data; 743 struct snd_soc_platform *platform = rtd->platform; 744 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 745 struct snd_soc_dai *codec_dai; 746 int i, ret = 0; 747 748 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 749 750 if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) { 751 ret = rtd->dai_link->ops->prepare(substream); 752 if (ret < 0) { 753 dev_err(rtd->card->dev, "ASoC: machine prepare error:" 754 " %d\n", ret); 755 goto out; 756 } 757 } 758 759 if (platform->driver->ops && platform->driver->ops->prepare) { 760 ret = platform->driver->ops->prepare(substream); 761 if (ret < 0) { 762 dev_err(platform->dev, "ASoC: platform prepare error:" 763 " %d\n", ret); 764 goto out; 765 } 766 } 767 768 for (i = 0; i < rtd->num_codecs; i++) { 769 codec_dai = rtd->codec_dais[i]; 770 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) { 771 ret = codec_dai->driver->ops->prepare(substream, 772 codec_dai); 773 if (ret < 0) { 774 dev_err(codec_dai->dev, 775 "ASoC: codec DAI prepare error: %d\n", 776 ret); 777 goto out; 778 } 779 } 780 } 781 782 if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) { 783 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai); 784 if (ret < 0) { 785 dev_err(cpu_dai->dev, 786 "ASoC: cpu DAI prepare error: %d\n", ret); 787 goto out; 788 } 789 } 790 791 /* cancel any delayed stream shutdown that is pending */ 792 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 793 rtd->pop_wait) { 794 rtd->pop_wait = 0; 795 cancel_delayed_work(&rtd->delayed_work); 796 } 797 798 snd_soc_dapm_stream_event(rtd, substream->stream, 799 SND_SOC_DAPM_STREAM_START); 800 801 for (i = 0; i < rtd->num_codecs; i++) 802 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0, 803 substream->stream); 804 snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream); 805 806 out: 807 mutex_unlock(&rtd->pcm_mutex); 808 return ret; 809 } 810 811 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params, 812 unsigned int mask) 813 { 814 struct snd_interval *interval; 815 int channels = hweight_long(mask); 816 817 interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 818 interval->min = channels; 819 interval->max = channels; 820 } 821 822 int soc_dai_hw_params(struct snd_pcm_substream *substream, 823 struct snd_pcm_hw_params *params, 824 struct snd_soc_dai *dai) 825 { 826 int ret; 827 828 if (dai->driver->ops && dai->driver->ops->hw_params) { 829 ret = dai->driver->ops->hw_params(substream, params, dai); 830 if (ret < 0) { 831 dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n", 832 dai->name, ret); 833 return ret; 834 } 835 } 836 837 return 0; 838 } 839 840 /* 841 * Called by ALSA when the hardware params are set by application. This 842 * function can also be called multiple times and can allocate buffers 843 * (using snd_pcm_lib_* ). It's non-atomic. 844 */ 845 static int soc_pcm_hw_params(struct snd_pcm_substream *substream, 846 struct snd_pcm_hw_params *params) 847 { 848 struct snd_soc_pcm_runtime *rtd = substream->private_data; 849 struct snd_soc_platform *platform = rtd->platform; 850 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 851 int i, ret = 0; 852 853 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 854 855 ret = soc_pcm_params_symmetry(substream, params); 856 if (ret) 857 goto out; 858 859 if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) { 860 ret = rtd->dai_link->ops->hw_params(substream, params); 861 if (ret < 0) { 862 dev_err(rtd->card->dev, "ASoC: machine hw_params" 863 " failed: %d\n", ret); 864 goto out; 865 } 866 } 867 868 for (i = 0; i < rtd->num_codecs; i++) { 869 struct snd_soc_dai *codec_dai = rtd->codec_dais[i]; 870 struct snd_pcm_hw_params codec_params; 871 872 /* 873 * Skip CODECs which don't support the current stream type, 874 * the idea being that if a CODEC is not used for the currently 875 * set up transfer direction, it should not need to be 876 * configured, especially since the configuration used might 877 * not even be supported by that CODEC. There may be cases 878 * however where a CODEC needs to be set up although it is 879 * actually not being used for the transfer, e.g. if a 880 * capture-only CODEC is acting as an LRCLK and/or BCLK master 881 * for the DAI link including a playback-only CODEC. 882 * If this becomes necessary, we will have to augment the 883 * machine driver setup with information on how to act, so 884 * we can do the right thing here. 885 */ 886 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream)) 887 continue; 888 889 /* copy params for each codec */ 890 codec_params = *params; 891 892 /* fixup params based on TDM slot masks */ 893 if (codec_dai->tx_mask) 894 soc_pcm_codec_params_fixup(&codec_params, 895 codec_dai->tx_mask); 896 if (codec_dai->rx_mask) 897 soc_pcm_codec_params_fixup(&codec_params, 898 codec_dai->rx_mask); 899 900 ret = soc_dai_hw_params(substream, &codec_params, codec_dai); 901 if(ret < 0) 902 goto codec_err; 903 904 codec_dai->rate = params_rate(&codec_params); 905 codec_dai->channels = params_channels(&codec_params); 906 codec_dai->sample_bits = snd_pcm_format_physical_width( 907 params_format(&codec_params)); 908 } 909 910 ret = soc_dai_hw_params(substream, params, cpu_dai); 911 if (ret < 0) 912 goto interface_err; 913 914 if (platform->driver->ops && platform->driver->ops->hw_params) { 915 ret = platform->driver->ops->hw_params(substream, params); 916 if (ret < 0) { 917 dev_err(platform->dev, "ASoC: %s hw params failed: %d\n", 918 platform->component.name, ret); 919 goto platform_err; 920 } 921 } 922 923 /* store the parameters for each DAIs */ 924 cpu_dai->rate = params_rate(params); 925 cpu_dai->channels = params_channels(params); 926 cpu_dai->sample_bits = 927 snd_pcm_format_physical_width(params_format(params)); 928 929 out: 930 mutex_unlock(&rtd->pcm_mutex); 931 return ret; 932 933 platform_err: 934 if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free) 935 cpu_dai->driver->ops->hw_free(substream, cpu_dai); 936 937 interface_err: 938 i = rtd->num_codecs; 939 940 codec_err: 941 while (--i >= 0) { 942 struct snd_soc_dai *codec_dai = rtd->codec_dais[i]; 943 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free) 944 codec_dai->driver->ops->hw_free(substream, codec_dai); 945 codec_dai->rate = 0; 946 } 947 948 if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free) 949 rtd->dai_link->ops->hw_free(substream); 950 951 mutex_unlock(&rtd->pcm_mutex); 952 return ret; 953 } 954 955 /* 956 * Frees resources allocated by hw_params, can be called multiple times 957 */ 958 static int soc_pcm_hw_free(struct snd_pcm_substream *substream) 959 { 960 struct snd_soc_pcm_runtime *rtd = substream->private_data; 961 struct snd_soc_platform *platform = rtd->platform; 962 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 963 struct snd_soc_dai *codec_dai; 964 bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 965 int i; 966 967 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 968 969 /* clear the corresponding DAIs parameters when going to be inactive */ 970 if (cpu_dai->active == 1) { 971 cpu_dai->rate = 0; 972 cpu_dai->channels = 0; 973 cpu_dai->sample_bits = 0; 974 } 975 976 for (i = 0; i < rtd->num_codecs; i++) { 977 codec_dai = rtd->codec_dais[i]; 978 if (codec_dai->active == 1) { 979 codec_dai->rate = 0; 980 codec_dai->channels = 0; 981 codec_dai->sample_bits = 0; 982 } 983 } 984 985 /* apply codec digital mute */ 986 for (i = 0; i < rtd->num_codecs; i++) { 987 if ((playback && rtd->codec_dais[i]->playback_active == 1) || 988 (!playback && rtd->codec_dais[i]->capture_active == 1)) 989 snd_soc_dai_digital_mute(rtd->codec_dais[i], 1, 990 substream->stream); 991 } 992 993 /* free any machine hw params */ 994 if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free) 995 rtd->dai_link->ops->hw_free(substream); 996 997 /* free any DMA resources */ 998 if (platform->driver->ops && platform->driver->ops->hw_free) 999 platform->driver->ops->hw_free(substream); 1000 1001 /* now free hw params for the DAIs */ 1002 for (i = 0; i < rtd->num_codecs; i++) { 1003 codec_dai = rtd->codec_dais[i]; 1004 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free) 1005 codec_dai->driver->ops->hw_free(substream, codec_dai); 1006 } 1007 1008 if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free) 1009 cpu_dai->driver->ops->hw_free(substream, cpu_dai); 1010 1011 mutex_unlock(&rtd->pcm_mutex); 1012 return 0; 1013 } 1014 1015 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 1016 { 1017 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1018 struct snd_soc_platform *platform = rtd->platform; 1019 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 1020 struct snd_soc_dai *codec_dai; 1021 int i, ret; 1022 1023 for (i = 0; i < rtd->num_codecs; i++) { 1024 codec_dai = rtd->codec_dais[i]; 1025 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) { 1026 ret = codec_dai->driver->ops->trigger(substream, 1027 cmd, codec_dai); 1028 if (ret < 0) 1029 return ret; 1030 } 1031 } 1032 1033 if (platform->driver->ops && platform->driver->ops->trigger) { 1034 ret = platform->driver->ops->trigger(substream, cmd); 1035 if (ret < 0) 1036 return ret; 1037 } 1038 1039 if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) { 1040 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai); 1041 if (ret < 0) 1042 return ret; 1043 } 1044 1045 if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) { 1046 ret = rtd->dai_link->ops->trigger(substream, cmd); 1047 if (ret < 0) 1048 return ret; 1049 } 1050 1051 return 0; 1052 } 1053 1054 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream, 1055 int cmd) 1056 { 1057 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1058 struct snd_soc_platform *platform = rtd->platform; 1059 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 1060 struct snd_soc_dai *codec_dai; 1061 int i, ret; 1062 1063 for (i = 0; i < rtd->num_codecs; i++) { 1064 codec_dai = rtd->codec_dais[i]; 1065 if (codec_dai->driver->ops && 1066 codec_dai->driver->ops->bespoke_trigger) { 1067 ret = codec_dai->driver->ops->bespoke_trigger(substream, 1068 cmd, codec_dai); 1069 if (ret < 0) 1070 return ret; 1071 } 1072 } 1073 1074 if (platform->driver->bespoke_trigger) { 1075 ret = platform->driver->bespoke_trigger(substream, cmd); 1076 if (ret < 0) 1077 return ret; 1078 } 1079 1080 if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) { 1081 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai); 1082 if (ret < 0) 1083 return ret; 1084 } 1085 return 0; 1086 } 1087 /* 1088 * soc level wrapper for pointer callback 1089 * If cpu_dai, codec_dai, platform driver has the delay callback, than 1090 * the runtime->delay will be updated accordingly. 1091 */ 1092 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream) 1093 { 1094 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1095 struct snd_soc_platform *platform = rtd->platform; 1096 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 1097 struct snd_soc_dai *codec_dai; 1098 struct snd_pcm_runtime *runtime = substream->runtime; 1099 snd_pcm_uframes_t offset = 0; 1100 snd_pcm_sframes_t delay = 0; 1101 snd_pcm_sframes_t codec_delay = 0; 1102 int i; 1103 1104 if (platform->driver->ops && platform->driver->ops->pointer) 1105 offset = platform->driver->ops->pointer(substream); 1106 1107 if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay) 1108 delay += cpu_dai->driver->ops->delay(substream, cpu_dai); 1109 1110 for (i = 0; i < rtd->num_codecs; i++) { 1111 codec_dai = rtd->codec_dais[i]; 1112 if (codec_dai->driver->ops && codec_dai->driver->ops->delay) 1113 codec_delay = max(codec_delay, 1114 codec_dai->driver->ops->delay(substream, 1115 codec_dai)); 1116 } 1117 delay += codec_delay; 1118 1119 /* 1120 * None of the existing platform drivers implement delay(), so 1121 * for now the codec_dai of first multicodec entry is used 1122 */ 1123 if (platform->driver->delay) 1124 delay += platform->driver->delay(substream, rtd->codec_dais[0]); 1125 1126 runtime->delay = delay; 1127 1128 return offset; 1129 } 1130 1131 /* connect a FE and BE */ 1132 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe, 1133 struct snd_soc_pcm_runtime *be, int stream) 1134 { 1135 struct snd_soc_dpcm *dpcm; 1136 1137 /* only add new dpcms */ 1138 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1139 if (dpcm->be == be && dpcm->fe == fe) 1140 return 0; 1141 } 1142 1143 dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL); 1144 if (!dpcm) 1145 return -ENOMEM; 1146 1147 dpcm->be = be; 1148 dpcm->fe = fe; 1149 be->dpcm[stream].runtime = fe->dpcm[stream].runtime; 1150 dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW; 1151 list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients); 1152 list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients); 1153 1154 dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n", 1155 stream ? "capture" : "playback", fe->dai_link->name, 1156 stream ? "<-" : "->", be->dai_link->name); 1157 1158 #ifdef CONFIG_DEBUG_FS 1159 if (fe->debugfs_dpcm_root) 1160 dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644, 1161 fe->debugfs_dpcm_root, &dpcm->state); 1162 #endif 1163 return 1; 1164 } 1165 1166 /* reparent a BE onto another FE */ 1167 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe, 1168 struct snd_soc_pcm_runtime *be, int stream) 1169 { 1170 struct snd_soc_dpcm *dpcm; 1171 struct snd_pcm_substream *fe_substream, *be_substream; 1172 1173 /* reparent if BE is connected to other FEs */ 1174 if (!be->dpcm[stream].users) 1175 return; 1176 1177 be_substream = snd_soc_dpcm_get_substream(be, stream); 1178 1179 list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) { 1180 if (dpcm->fe == fe) 1181 continue; 1182 1183 dev_dbg(fe->dev, "reparent %s path %s %s %s\n", 1184 stream ? "capture" : "playback", 1185 dpcm->fe->dai_link->name, 1186 stream ? "<-" : "->", dpcm->be->dai_link->name); 1187 1188 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream); 1189 be_substream->runtime = fe_substream->runtime; 1190 break; 1191 } 1192 } 1193 1194 /* disconnect a BE and FE */ 1195 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream) 1196 { 1197 struct snd_soc_dpcm *dpcm, *d; 1198 1199 list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) { 1200 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n", 1201 stream ? "capture" : "playback", 1202 dpcm->be->dai_link->name); 1203 1204 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE) 1205 continue; 1206 1207 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n", 1208 stream ? "capture" : "playback", fe->dai_link->name, 1209 stream ? "<-" : "->", dpcm->be->dai_link->name); 1210 1211 /* BEs still alive need new FE */ 1212 dpcm_be_reparent(fe, dpcm->be, stream); 1213 1214 #ifdef CONFIG_DEBUG_FS 1215 debugfs_remove(dpcm->debugfs_state); 1216 #endif 1217 list_del(&dpcm->list_be); 1218 list_del(&dpcm->list_fe); 1219 kfree(dpcm); 1220 } 1221 } 1222 1223 /* get BE for DAI widget and stream */ 1224 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card, 1225 struct snd_soc_dapm_widget *widget, int stream) 1226 { 1227 struct snd_soc_pcm_runtime *be; 1228 int i; 1229 1230 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 1231 list_for_each_entry(be, &card->rtd_list, list) { 1232 1233 if (!be->dai_link->no_pcm) 1234 continue; 1235 1236 if (be->cpu_dai->playback_widget == widget) 1237 return be; 1238 1239 for (i = 0; i < be->num_codecs; i++) { 1240 struct snd_soc_dai *dai = be->codec_dais[i]; 1241 if (dai->playback_widget == widget) 1242 return be; 1243 } 1244 } 1245 } else { 1246 1247 list_for_each_entry(be, &card->rtd_list, list) { 1248 1249 if (!be->dai_link->no_pcm) 1250 continue; 1251 1252 if (be->cpu_dai->capture_widget == widget) 1253 return be; 1254 1255 for (i = 0; i < be->num_codecs; i++) { 1256 struct snd_soc_dai *dai = be->codec_dais[i]; 1257 if (dai->capture_widget == widget) 1258 return be; 1259 } 1260 } 1261 } 1262 1263 dev_err(card->dev, "ASoC: can't get %s BE for %s\n", 1264 stream ? "capture" : "playback", widget->name); 1265 return NULL; 1266 } 1267 1268 static inline struct snd_soc_dapm_widget * 1269 dai_get_widget(struct snd_soc_dai *dai, int stream) 1270 { 1271 if (stream == SNDRV_PCM_STREAM_PLAYBACK) 1272 return dai->playback_widget; 1273 else 1274 return dai->capture_widget; 1275 } 1276 1277 static int widget_in_list(struct snd_soc_dapm_widget_list *list, 1278 struct snd_soc_dapm_widget *widget) 1279 { 1280 int i; 1281 1282 for (i = 0; i < list->num_widgets; i++) { 1283 if (widget == list->widgets[i]) 1284 return 1; 1285 } 1286 1287 return 0; 1288 } 1289 1290 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, 1291 enum snd_soc_dapm_direction dir) 1292 { 1293 struct snd_soc_card *card = widget->dapm->card; 1294 struct snd_soc_pcm_runtime *rtd; 1295 int i; 1296 1297 if (dir == SND_SOC_DAPM_DIR_OUT) { 1298 list_for_each_entry(rtd, &card->rtd_list, list) { 1299 if (!rtd->dai_link->no_pcm) 1300 continue; 1301 1302 if (rtd->cpu_dai->playback_widget == widget) 1303 return true; 1304 1305 for (i = 0; i < rtd->num_codecs; ++i) { 1306 struct snd_soc_dai *dai = rtd->codec_dais[i]; 1307 if (dai->playback_widget == widget) 1308 return true; 1309 } 1310 } 1311 } else { /* SND_SOC_DAPM_DIR_IN */ 1312 list_for_each_entry(rtd, &card->rtd_list, list) { 1313 if (!rtd->dai_link->no_pcm) 1314 continue; 1315 1316 if (rtd->cpu_dai->capture_widget == widget) 1317 return true; 1318 1319 for (i = 0; i < rtd->num_codecs; ++i) { 1320 struct snd_soc_dai *dai = rtd->codec_dais[i]; 1321 if (dai->capture_widget == widget) 1322 return true; 1323 } 1324 } 1325 } 1326 1327 return false; 1328 } 1329 1330 int dpcm_path_get(struct snd_soc_pcm_runtime *fe, 1331 int stream, struct snd_soc_dapm_widget_list **list) 1332 { 1333 struct snd_soc_dai *cpu_dai = fe->cpu_dai; 1334 int paths; 1335 1336 /* get number of valid DAI paths and their widgets */ 1337 paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list, 1338 dpcm_end_walk_at_be); 1339 1340 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths, 1341 stream ? "capture" : "playback"); 1342 1343 return paths; 1344 } 1345 1346 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream, 1347 struct snd_soc_dapm_widget_list **list_) 1348 { 1349 struct snd_soc_dpcm *dpcm; 1350 struct snd_soc_dapm_widget_list *list = *list_; 1351 struct snd_soc_dapm_widget *widget; 1352 int prune = 0; 1353 1354 /* Destroy any old FE <--> BE connections */ 1355 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1356 unsigned int i; 1357 1358 /* is there a valid CPU DAI widget for this BE */ 1359 widget = dai_get_widget(dpcm->be->cpu_dai, stream); 1360 1361 /* prune the BE if it's no longer in our active list */ 1362 if (widget && widget_in_list(list, widget)) 1363 continue; 1364 1365 /* is there a valid CODEC DAI widget for this BE */ 1366 for (i = 0; i < dpcm->be->num_codecs; i++) { 1367 struct snd_soc_dai *dai = dpcm->be->codec_dais[i]; 1368 widget = dai_get_widget(dai, stream); 1369 1370 /* prune the BE if it's no longer in our active list */ 1371 if (widget && widget_in_list(list, widget)) 1372 continue; 1373 } 1374 1375 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n", 1376 stream ? "capture" : "playback", 1377 dpcm->be->dai_link->name, fe->dai_link->name); 1378 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE; 1379 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE; 1380 prune++; 1381 } 1382 1383 dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune); 1384 return prune; 1385 } 1386 1387 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream, 1388 struct snd_soc_dapm_widget_list **list_) 1389 { 1390 struct snd_soc_card *card = fe->card; 1391 struct snd_soc_dapm_widget_list *list = *list_; 1392 struct snd_soc_pcm_runtime *be; 1393 int i, new = 0, err; 1394 1395 /* Create any new FE <--> BE connections */ 1396 for (i = 0; i < list->num_widgets; i++) { 1397 1398 switch (list->widgets[i]->id) { 1399 case snd_soc_dapm_dai_in: 1400 if (stream != SNDRV_PCM_STREAM_PLAYBACK) 1401 continue; 1402 break; 1403 case snd_soc_dapm_dai_out: 1404 if (stream != SNDRV_PCM_STREAM_CAPTURE) 1405 continue; 1406 break; 1407 default: 1408 continue; 1409 } 1410 1411 /* is there a valid BE rtd for this widget */ 1412 be = dpcm_get_be(card, list->widgets[i], stream); 1413 if (!be) { 1414 dev_err(fe->dev, "ASoC: no BE found for %s\n", 1415 list->widgets[i]->name); 1416 continue; 1417 } 1418 1419 /* make sure BE is a real BE */ 1420 if (!be->dai_link->no_pcm) 1421 continue; 1422 1423 /* don't connect if FE is not running */ 1424 if (!fe->dpcm[stream].runtime && !fe->fe_compr) 1425 continue; 1426 1427 /* newly connected FE and BE */ 1428 err = dpcm_be_connect(fe, be, stream); 1429 if (err < 0) { 1430 dev_err(fe->dev, "ASoC: can't connect %s\n", 1431 list->widgets[i]->name); 1432 break; 1433 } else if (err == 0) /* already connected */ 1434 continue; 1435 1436 /* new */ 1437 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE; 1438 new++; 1439 } 1440 1441 dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new); 1442 return new; 1443 } 1444 1445 /* 1446 * Find the corresponding BE DAIs that source or sink audio to this 1447 * FE substream. 1448 */ 1449 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe, 1450 int stream, struct snd_soc_dapm_widget_list **list, int new) 1451 { 1452 if (new) 1453 return dpcm_add_paths(fe, stream, list); 1454 else 1455 return dpcm_prune_paths(fe, stream, list); 1456 } 1457 1458 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream) 1459 { 1460 struct snd_soc_dpcm *dpcm; 1461 1462 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) 1463 dpcm->be->dpcm[stream].runtime_update = 1464 SND_SOC_DPCM_UPDATE_NO; 1465 } 1466 1467 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe, 1468 int stream) 1469 { 1470 struct snd_soc_dpcm *dpcm; 1471 1472 /* disable any enabled and non active backends */ 1473 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1474 1475 struct snd_soc_pcm_runtime *be = dpcm->be; 1476 struct snd_pcm_substream *be_substream = 1477 snd_soc_dpcm_get_substream(be, stream); 1478 1479 if (be->dpcm[stream].users == 0) 1480 dev_err(be->dev, "ASoC: no users %s at close - state %d\n", 1481 stream ? "capture" : "playback", 1482 be->dpcm[stream].state); 1483 1484 if (--be->dpcm[stream].users != 0) 1485 continue; 1486 1487 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) 1488 continue; 1489 1490 soc_pcm_close(be_substream); 1491 be_substream->runtime = NULL; 1492 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1493 } 1494 } 1495 1496 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream) 1497 { 1498 struct snd_soc_dpcm *dpcm; 1499 int err, count = 0; 1500 1501 /* only startup BE DAIs that are either sinks or sources to this FE DAI */ 1502 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1503 1504 struct snd_soc_pcm_runtime *be = dpcm->be; 1505 struct snd_pcm_substream *be_substream = 1506 snd_soc_dpcm_get_substream(be, stream); 1507 1508 if (!be_substream) { 1509 dev_err(be->dev, "ASoC: no backend %s stream\n", 1510 stream ? "capture" : "playback"); 1511 continue; 1512 } 1513 1514 /* is this op for this BE ? */ 1515 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1516 continue; 1517 1518 /* first time the dpcm is open ? */ 1519 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) 1520 dev_err(be->dev, "ASoC: too many users %s at open %d\n", 1521 stream ? "capture" : "playback", 1522 be->dpcm[stream].state); 1523 1524 if (be->dpcm[stream].users++ != 0) 1525 continue; 1526 1527 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) && 1528 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE)) 1529 continue; 1530 1531 dev_dbg(be->dev, "ASoC: open %s BE %s\n", 1532 stream ? "capture" : "playback", be->dai_link->name); 1533 1534 be_substream->runtime = be->dpcm[stream].runtime; 1535 err = soc_pcm_open(be_substream); 1536 if (err < 0) { 1537 dev_err(be->dev, "ASoC: BE open failed %d\n", err); 1538 be->dpcm[stream].users--; 1539 if (be->dpcm[stream].users < 0) 1540 dev_err(be->dev, "ASoC: no users %s at unwind %d\n", 1541 stream ? "capture" : "playback", 1542 be->dpcm[stream].state); 1543 1544 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1545 goto unwind; 1546 } 1547 1548 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN; 1549 count++; 1550 } 1551 1552 return count; 1553 1554 unwind: 1555 /* disable any enabled and non active backends */ 1556 list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1557 struct snd_soc_pcm_runtime *be = dpcm->be; 1558 struct snd_pcm_substream *be_substream = 1559 snd_soc_dpcm_get_substream(be, stream); 1560 1561 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1562 continue; 1563 1564 if (be->dpcm[stream].users == 0) 1565 dev_err(be->dev, "ASoC: no users %s at close %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_OPEN) 1573 continue; 1574 1575 soc_pcm_close(be_substream); 1576 be_substream->runtime = NULL; 1577 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1578 } 1579 1580 return err; 1581 } 1582 1583 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime, 1584 struct snd_soc_pcm_stream *stream, 1585 u64 formats) 1586 { 1587 runtime->hw.rate_min = stream->rate_min; 1588 runtime->hw.rate_max = stream->rate_max; 1589 runtime->hw.channels_min = stream->channels_min; 1590 runtime->hw.channels_max = stream->channels_max; 1591 if (runtime->hw.formats) 1592 runtime->hw.formats &= formats & stream->formats; 1593 else 1594 runtime->hw.formats = formats & stream->formats; 1595 runtime->hw.rates = stream->rates; 1596 } 1597 1598 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream) 1599 { 1600 struct snd_soc_pcm_runtime *fe = substream->private_data; 1601 struct snd_soc_dpcm *dpcm; 1602 u64 formats = ULLONG_MAX; 1603 int stream = substream->stream; 1604 1605 if (!fe->dai_link->dpcm_merged_format) 1606 return formats; 1607 1608 /* 1609 * It returns merged BE codec format 1610 * if FE want to use it (= dpcm_merged_format) 1611 */ 1612 1613 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1614 struct snd_soc_pcm_runtime *be = dpcm->be; 1615 struct snd_soc_dai_driver *codec_dai_drv; 1616 struct snd_soc_pcm_stream *codec_stream; 1617 int i; 1618 1619 for (i = 0; i < be->num_codecs; i++) { 1620 codec_dai_drv = be->codec_dais[i]->driver; 1621 if (stream == SNDRV_PCM_STREAM_PLAYBACK) 1622 codec_stream = &codec_dai_drv->playback; 1623 else 1624 codec_stream = &codec_dai_drv->capture; 1625 1626 formats &= codec_stream->formats; 1627 } 1628 } 1629 1630 return formats; 1631 } 1632 1633 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream) 1634 { 1635 struct snd_pcm_runtime *runtime = substream->runtime; 1636 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1637 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 1638 struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver; 1639 u64 format = dpcm_runtime_base_format(substream); 1640 1641 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1642 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format); 1643 else 1644 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format); 1645 } 1646 1647 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd); 1648 1649 /* Set FE's runtime_update state; the state is protected via PCM stream lock 1650 * for avoiding the race with trigger callback. 1651 * If the state is unset and a trigger is pending while the previous operation, 1652 * process the pending trigger action here. 1653 */ 1654 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe, 1655 int stream, enum snd_soc_dpcm_update state) 1656 { 1657 struct snd_pcm_substream *substream = 1658 snd_soc_dpcm_get_substream(fe, stream); 1659 1660 snd_pcm_stream_lock_irq(substream); 1661 if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) { 1662 dpcm_fe_dai_do_trigger(substream, 1663 fe->dpcm[stream].trigger_pending - 1); 1664 fe->dpcm[stream].trigger_pending = 0; 1665 } 1666 fe->dpcm[stream].runtime_update = state; 1667 snd_pcm_stream_unlock_irq(substream); 1668 } 1669 1670 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream, 1671 int stream) 1672 { 1673 struct snd_soc_dpcm *dpcm; 1674 struct snd_soc_pcm_runtime *fe = fe_substream->private_data; 1675 struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai; 1676 int err; 1677 1678 /* apply symmetry for FE */ 1679 if (soc_pcm_has_symmetry(fe_substream)) 1680 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX; 1681 1682 /* Symmetry only applies if we've got an active stream. */ 1683 if (fe_cpu_dai->active) { 1684 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai); 1685 if (err < 0) 1686 return err; 1687 } 1688 1689 /* apply symmetry for BE */ 1690 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1691 struct snd_soc_pcm_runtime *be = dpcm->be; 1692 struct snd_pcm_substream *be_substream = 1693 snd_soc_dpcm_get_substream(be, stream); 1694 struct snd_soc_pcm_runtime *rtd = be_substream->private_data; 1695 int i; 1696 1697 if (rtd->dai_link->be_hw_params_fixup) 1698 continue; 1699 1700 if (soc_pcm_has_symmetry(be_substream)) 1701 be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX; 1702 1703 /* Symmetry only applies if we've got an active stream. */ 1704 if (rtd->cpu_dai->active) { 1705 err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai); 1706 if (err < 0) 1707 return err; 1708 } 1709 1710 for (i = 0; i < rtd->num_codecs; i++) { 1711 if (rtd->codec_dais[i]->active) { 1712 err = soc_pcm_apply_symmetry(be_substream, 1713 rtd->codec_dais[i]); 1714 if (err < 0) 1715 return err; 1716 } 1717 } 1718 } 1719 1720 return 0; 1721 } 1722 1723 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream) 1724 { 1725 struct snd_soc_pcm_runtime *fe = fe_substream->private_data; 1726 struct snd_pcm_runtime *runtime = fe_substream->runtime; 1727 int stream = fe_substream->stream, ret = 0; 1728 1729 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 1730 1731 ret = dpcm_be_dai_startup(fe, fe_substream->stream); 1732 if (ret < 0) { 1733 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret); 1734 goto be_err; 1735 } 1736 1737 dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name); 1738 1739 /* start the DAI frontend */ 1740 ret = soc_pcm_open(fe_substream); 1741 if (ret < 0) { 1742 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret); 1743 goto unwind; 1744 } 1745 1746 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN; 1747 1748 dpcm_set_fe_runtime(fe_substream); 1749 snd_pcm_limit_hw_rates(runtime); 1750 1751 ret = dpcm_apply_symmetry(fe_substream, stream); 1752 if (ret < 0) { 1753 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n", 1754 ret); 1755 goto unwind; 1756 } 1757 1758 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 1759 return 0; 1760 1761 unwind: 1762 dpcm_be_dai_startup_unwind(fe, fe_substream->stream); 1763 be_err: 1764 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 1765 return ret; 1766 } 1767 1768 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream) 1769 { 1770 struct snd_soc_dpcm *dpcm; 1771 1772 /* only shutdown BEs that are either sinks or sources to this FE DAI */ 1773 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1774 1775 struct snd_soc_pcm_runtime *be = dpcm->be; 1776 struct snd_pcm_substream *be_substream = 1777 snd_soc_dpcm_get_substream(be, stream); 1778 1779 /* is this op for this BE ? */ 1780 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1781 continue; 1782 1783 if (be->dpcm[stream].users == 0) 1784 dev_err(be->dev, "ASoC: no users %s at close - state %d\n", 1785 stream ? "capture" : "playback", 1786 be->dpcm[stream].state); 1787 1788 if (--be->dpcm[stream].users != 0) 1789 continue; 1790 1791 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) && 1792 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)) 1793 continue; 1794 1795 dev_dbg(be->dev, "ASoC: close BE %s\n", 1796 be->dai_link->name); 1797 1798 soc_pcm_close(be_substream); 1799 be_substream->runtime = NULL; 1800 1801 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1802 } 1803 return 0; 1804 } 1805 1806 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream) 1807 { 1808 struct snd_soc_pcm_runtime *fe = substream->private_data; 1809 int stream = substream->stream; 1810 1811 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 1812 1813 /* shutdown the BEs */ 1814 dpcm_be_dai_shutdown(fe, substream->stream); 1815 1816 dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name); 1817 1818 /* now shutdown the frontend */ 1819 soc_pcm_close(substream); 1820 1821 /* run the stream event for each BE */ 1822 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP); 1823 1824 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1825 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 1826 return 0; 1827 } 1828 1829 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream) 1830 { 1831 struct snd_soc_dpcm *dpcm; 1832 1833 /* only hw_params backends that are either sinks or sources 1834 * to this frontend DAI */ 1835 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1836 1837 struct snd_soc_pcm_runtime *be = dpcm->be; 1838 struct snd_pcm_substream *be_substream = 1839 snd_soc_dpcm_get_substream(be, stream); 1840 1841 /* is this op for this BE ? */ 1842 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1843 continue; 1844 1845 /* only free hw when no longer used - check all FEs */ 1846 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream)) 1847 continue; 1848 1849 /* do not free hw if this BE is used by other FE */ 1850 if (be->dpcm[stream].users > 1) 1851 continue; 1852 1853 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 1854 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) && 1855 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) && 1856 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) && 1857 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) && 1858 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND)) 1859 continue; 1860 1861 dev_dbg(be->dev, "ASoC: hw_free BE %s\n", 1862 be->dai_link->name); 1863 1864 soc_pcm_hw_free(be_substream); 1865 1866 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE; 1867 } 1868 1869 return 0; 1870 } 1871 1872 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream) 1873 { 1874 struct snd_soc_pcm_runtime *fe = substream->private_data; 1875 int err, stream = substream->stream; 1876 1877 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME); 1878 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 1879 1880 dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name); 1881 1882 /* call hw_free on the frontend */ 1883 err = soc_pcm_hw_free(substream); 1884 if (err < 0) 1885 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n", 1886 fe->dai_link->name); 1887 1888 /* only hw_params backends that are either sinks or sources 1889 * to this frontend DAI */ 1890 err = dpcm_be_dai_hw_free(fe, stream); 1891 1892 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE; 1893 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 1894 1895 mutex_unlock(&fe->card->mutex); 1896 return 0; 1897 } 1898 1899 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream) 1900 { 1901 struct snd_soc_dpcm *dpcm; 1902 int ret; 1903 1904 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1905 1906 struct snd_soc_pcm_runtime *be = dpcm->be; 1907 struct snd_pcm_substream *be_substream = 1908 snd_soc_dpcm_get_substream(be, stream); 1909 1910 /* is this op for this BE ? */ 1911 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1912 continue; 1913 1914 /* copy params for each dpcm */ 1915 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params, 1916 sizeof(struct snd_pcm_hw_params)); 1917 1918 /* perform any hw_params fixups */ 1919 if (be->dai_link->be_hw_params_fixup) { 1920 ret = be->dai_link->be_hw_params_fixup(be, 1921 &dpcm->hw_params); 1922 if (ret < 0) { 1923 dev_err(be->dev, 1924 "ASoC: hw_params BE fixup failed %d\n", 1925 ret); 1926 goto unwind; 1927 } 1928 } 1929 1930 /* only allow hw_params() if no connected FEs are running */ 1931 if (!snd_soc_dpcm_can_be_params(fe, be, stream)) 1932 continue; 1933 1934 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) && 1935 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 1936 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE)) 1937 continue; 1938 1939 dev_dbg(be->dev, "ASoC: hw_params BE %s\n", 1940 be->dai_link->name); 1941 1942 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params); 1943 if (ret < 0) { 1944 dev_err(dpcm->be->dev, 1945 "ASoC: hw_params BE failed %d\n", ret); 1946 goto unwind; 1947 } 1948 1949 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS; 1950 } 1951 return 0; 1952 1953 unwind: 1954 /* disable any enabled and non active backends */ 1955 list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) { 1956 struct snd_soc_pcm_runtime *be = dpcm->be; 1957 struct snd_pcm_substream *be_substream = 1958 snd_soc_dpcm_get_substream(be, stream); 1959 1960 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1961 continue; 1962 1963 /* only allow hw_free() if no connected FEs are running */ 1964 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream)) 1965 continue; 1966 1967 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) && 1968 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 1969 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) && 1970 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)) 1971 continue; 1972 1973 soc_pcm_hw_free(be_substream); 1974 } 1975 1976 return ret; 1977 } 1978 1979 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream, 1980 struct snd_pcm_hw_params *params) 1981 { 1982 struct snd_soc_pcm_runtime *fe = substream->private_data; 1983 int ret, stream = substream->stream; 1984 1985 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME); 1986 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 1987 1988 memcpy(&fe->dpcm[substream->stream].hw_params, params, 1989 sizeof(struct snd_pcm_hw_params)); 1990 ret = dpcm_be_dai_hw_params(fe, substream->stream); 1991 if (ret < 0) { 1992 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret); 1993 goto out; 1994 } 1995 1996 dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n", 1997 fe->dai_link->name, params_rate(params), 1998 params_channels(params), params_format(params)); 1999 2000 /* call hw_params on the frontend */ 2001 ret = soc_pcm_hw_params(substream, params); 2002 if (ret < 0) { 2003 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret); 2004 dpcm_be_dai_hw_free(fe, stream); 2005 } else 2006 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS; 2007 2008 out: 2009 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 2010 mutex_unlock(&fe->card->mutex); 2011 return ret; 2012 } 2013 2014 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm, 2015 struct snd_pcm_substream *substream, int cmd) 2016 { 2017 int ret; 2018 2019 dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n", 2020 dpcm->be->dai_link->name, cmd); 2021 2022 ret = soc_pcm_trigger(substream, cmd); 2023 if (ret < 0) 2024 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret); 2025 2026 return ret; 2027 } 2028 2029 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, 2030 int cmd) 2031 { 2032 struct snd_soc_dpcm *dpcm; 2033 int ret = 0; 2034 2035 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 2036 2037 struct snd_soc_pcm_runtime *be = dpcm->be; 2038 struct snd_pcm_substream *be_substream = 2039 snd_soc_dpcm_get_substream(be, stream); 2040 2041 /* is this op for this BE ? */ 2042 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2043 continue; 2044 2045 switch (cmd) { 2046 case SNDRV_PCM_TRIGGER_START: 2047 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) && 2048 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)) 2049 continue; 2050 2051 ret = dpcm_do_trigger(dpcm, be_substream, cmd); 2052 if (ret) 2053 return ret; 2054 2055 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2056 break; 2057 case SNDRV_PCM_TRIGGER_RESUME: 2058 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND)) 2059 continue; 2060 2061 ret = dpcm_do_trigger(dpcm, be_substream, cmd); 2062 if (ret) 2063 return ret; 2064 2065 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2066 break; 2067 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2068 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) 2069 continue; 2070 2071 ret = dpcm_do_trigger(dpcm, be_substream, cmd); 2072 if (ret) 2073 return ret; 2074 2075 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2076 break; 2077 case SNDRV_PCM_TRIGGER_STOP: 2078 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) 2079 continue; 2080 2081 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream)) 2082 continue; 2083 2084 ret = dpcm_do_trigger(dpcm, be_substream, cmd); 2085 if (ret) 2086 return ret; 2087 2088 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP; 2089 break; 2090 case SNDRV_PCM_TRIGGER_SUSPEND: 2091 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) 2092 continue; 2093 2094 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream)) 2095 continue; 2096 2097 ret = dpcm_do_trigger(dpcm, be_substream, cmd); 2098 if (ret) 2099 return ret; 2100 2101 be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND; 2102 break; 2103 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2104 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) 2105 continue; 2106 2107 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream)) 2108 continue; 2109 2110 ret = dpcm_do_trigger(dpcm, be_substream, cmd); 2111 if (ret) 2112 return ret; 2113 2114 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED; 2115 break; 2116 } 2117 } 2118 2119 return ret; 2120 } 2121 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger); 2122 2123 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd) 2124 { 2125 struct snd_soc_pcm_runtime *fe = substream->private_data; 2126 int stream = substream->stream, ret; 2127 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream]; 2128 2129 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE; 2130 2131 switch (trigger) { 2132 case SND_SOC_DPCM_TRIGGER_PRE: 2133 /* call trigger on the frontend before the backend. */ 2134 2135 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n", 2136 fe->dai_link->name, cmd); 2137 2138 ret = soc_pcm_trigger(substream, cmd); 2139 if (ret < 0) { 2140 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret); 2141 goto out; 2142 } 2143 2144 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd); 2145 break; 2146 case SND_SOC_DPCM_TRIGGER_POST: 2147 /* call trigger on the frontend after the backend. */ 2148 2149 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd); 2150 if (ret < 0) { 2151 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret); 2152 goto out; 2153 } 2154 2155 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n", 2156 fe->dai_link->name, cmd); 2157 2158 ret = soc_pcm_trigger(substream, cmd); 2159 break; 2160 case SND_SOC_DPCM_TRIGGER_BESPOKE: 2161 /* bespoke trigger() - handles both FE and BEs */ 2162 2163 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n", 2164 fe->dai_link->name, cmd); 2165 2166 ret = soc_pcm_bespoke_trigger(substream, cmd); 2167 if (ret < 0) { 2168 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret); 2169 goto out; 2170 } 2171 break; 2172 default: 2173 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd, 2174 fe->dai_link->name); 2175 ret = -EINVAL; 2176 goto out; 2177 } 2178 2179 switch (cmd) { 2180 case SNDRV_PCM_TRIGGER_START: 2181 case SNDRV_PCM_TRIGGER_RESUME: 2182 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2183 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2184 break; 2185 case SNDRV_PCM_TRIGGER_STOP: 2186 case SNDRV_PCM_TRIGGER_SUSPEND: 2187 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP; 2188 break; 2189 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2190 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED; 2191 break; 2192 } 2193 2194 out: 2195 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO; 2196 return ret; 2197 } 2198 2199 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd) 2200 { 2201 struct snd_soc_pcm_runtime *fe = substream->private_data; 2202 int stream = substream->stream; 2203 2204 /* if FE's runtime_update is already set, we're in race; 2205 * process this trigger later at exit 2206 */ 2207 if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) { 2208 fe->dpcm[stream].trigger_pending = cmd + 1; 2209 return 0; /* delayed, assuming it's successful */ 2210 } 2211 2212 /* we're alone, let's trigger */ 2213 return dpcm_fe_dai_do_trigger(substream, cmd); 2214 } 2215 2216 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream) 2217 { 2218 struct snd_soc_dpcm *dpcm; 2219 int ret = 0; 2220 2221 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 2222 2223 struct snd_soc_pcm_runtime *be = dpcm->be; 2224 struct snd_pcm_substream *be_substream = 2225 snd_soc_dpcm_get_substream(be, stream); 2226 2227 /* is this op for this BE ? */ 2228 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2229 continue; 2230 2231 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 2232 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) && 2233 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND)) 2234 continue; 2235 2236 dev_dbg(be->dev, "ASoC: prepare BE %s\n", 2237 be->dai_link->name); 2238 2239 ret = soc_pcm_prepare(be_substream); 2240 if (ret < 0) { 2241 dev_err(be->dev, "ASoC: backend prepare failed %d\n", 2242 ret); 2243 break; 2244 } 2245 2246 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE; 2247 } 2248 return ret; 2249 } 2250 2251 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream) 2252 { 2253 struct snd_soc_pcm_runtime *fe = substream->private_data; 2254 int stream = substream->stream, ret = 0; 2255 2256 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME); 2257 2258 dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name); 2259 2260 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 2261 2262 /* there is no point preparing this FE if there are no BEs */ 2263 if (list_empty(&fe->dpcm[stream].be_clients)) { 2264 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n", 2265 fe->dai_link->name); 2266 ret = -EINVAL; 2267 goto out; 2268 } 2269 2270 ret = dpcm_be_dai_prepare(fe, substream->stream); 2271 if (ret < 0) 2272 goto out; 2273 2274 /* call prepare on the frontend */ 2275 ret = soc_pcm_prepare(substream); 2276 if (ret < 0) { 2277 dev_err(fe->dev,"ASoC: prepare FE %s failed\n", 2278 fe->dai_link->name); 2279 goto out; 2280 } 2281 2282 /* run the stream event for each BE */ 2283 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START); 2284 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE; 2285 2286 out: 2287 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 2288 mutex_unlock(&fe->card->mutex); 2289 2290 return ret; 2291 } 2292 2293 static int soc_pcm_ioctl(struct snd_pcm_substream *substream, 2294 unsigned int cmd, void *arg) 2295 { 2296 struct snd_soc_pcm_runtime *rtd = substream->private_data; 2297 struct snd_soc_platform *platform = rtd->platform; 2298 2299 if (platform->driver->ops && platform->driver->ops->ioctl) 2300 return platform->driver->ops->ioctl(substream, cmd, arg); 2301 return snd_pcm_lib_ioctl(substream, cmd, arg); 2302 } 2303 2304 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream) 2305 { 2306 struct snd_pcm_substream *substream = 2307 snd_soc_dpcm_get_substream(fe, stream); 2308 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream]; 2309 int err; 2310 2311 dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n", 2312 stream ? "capture" : "playback", fe->dai_link->name); 2313 2314 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) { 2315 /* call bespoke trigger - FE takes care of all BE triggers */ 2316 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n", 2317 fe->dai_link->name); 2318 2319 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP); 2320 if (err < 0) 2321 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err); 2322 } else { 2323 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n", 2324 fe->dai_link->name); 2325 2326 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP); 2327 if (err < 0) 2328 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err); 2329 } 2330 2331 err = dpcm_be_dai_hw_free(fe, stream); 2332 if (err < 0) 2333 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err); 2334 2335 err = dpcm_be_dai_shutdown(fe, stream); 2336 if (err < 0) 2337 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err); 2338 2339 /* run the stream event for each BE */ 2340 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP); 2341 2342 return 0; 2343 } 2344 2345 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream) 2346 { 2347 struct snd_pcm_substream *substream = 2348 snd_soc_dpcm_get_substream(fe, stream); 2349 struct snd_soc_dpcm *dpcm; 2350 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream]; 2351 int ret; 2352 2353 dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n", 2354 stream ? "capture" : "playback", fe->dai_link->name); 2355 2356 /* Only start the BE if the FE is ready */ 2357 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE || 2358 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) 2359 return -EINVAL; 2360 2361 /* startup must always be called for new BEs */ 2362 ret = dpcm_be_dai_startup(fe, stream); 2363 if (ret < 0) 2364 goto disconnect; 2365 2366 /* keep going if FE state is > open */ 2367 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN) 2368 return 0; 2369 2370 ret = dpcm_be_dai_hw_params(fe, stream); 2371 if (ret < 0) 2372 goto close; 2373 2374 /* keep going if FE state is > hw_params */ 2375 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS) 2376 return 0; 2377 2378 2379 ret = dpcm_be_dai_prepare(fe, stream); 2380 if (ret < 0) 2381 goto hw_free; 2382 2383 /* run the stream event for each BE */ 2384 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP); 2385 2386 /* keep going if FE state is > prepare */ 2387 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE || 2388 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP) 2389 return 0; 2390 2391 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) { 2392 /* call trigger on the frontend - FE takes care of all BE triggers */ 2393 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n", 2394 fe->dai_link->name); 2395 2396 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START); 2397 if (ret < 0) { 2398 dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret); 2399 goto hw_free; 2400 } 2401 } else { 2402 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n", 2403 fe->dai_link->name); 2404 2405 ret = dpcm_be_dai_trigger(fe, stream, 2406 SNDRV_PCM_TRIGGER_START); 2407 if (ret < 0) { 2408 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret); 2409 goto hw_free; 2410 } 2411 } 2412 2413 return 0; 2414 2415 hw_free: 2416 dpcm_be_dai_hw_free(fe, stream); 2417 close: 2418 dpcm_be_dai_shutdown(fe, stream); 2419 disconnect: 2420 /* disconnect any non started BEs */ 2421 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 2422 struct snd_soc_pcm_runtime *be = dpcm->be; 2423 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) 2424 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE; 2425 } 2426 2427 return ret; 2428 } 2429 2430 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream) 2431 { 2432 int ret; 2433 2434 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE); 2435 ret = dpcm_run_update_startup(fe, stream); 2436 if (ret < 0) 2437 dev_err(fe->dev, "ASoC: failed to startup some BEs\n"); 2438 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 2439 2440 return ret; 2441 } 2442 2443 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream) 2444 { 2445 int ret; 2446 2447 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE); 2448 ret = dpcm_run_update_shutdown(fe, stream); 2449 if (ret < 0) 2450 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n"); 2451 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 2452 2453 return ret; 2454 } 2455 2456 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and 2457 * any DAI links. 2458 */ 2459 int soc_dpcm_runtime_update(struct snd_soc_card *card) 2460 { 2461 struct snd_soc_pcm_runtime *fe; 2462 int old, new, paths; 2463 2464 mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME); 2465 list_for_each_entry(fe, &card->rtd_list, list) { 2466 struct snd_soc_dapm_widget_list *list; 2467 2468 /* make sure link is FE */ 2469 if (!fe->dai_link->dynamic) 2470 continue; 2471 2472 /* only check active links */ 2473 if (!fe->cpu_dai->active) 2474 continue; 2475 2476 /* DAPM sync will call this to update DSP paths */ 2477 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n", 2478 fe->dai_link->name); 2479 2480 /* skip if FE doesn't have playback capability */ 2481 if (!fe->cpu_dai->driver->playback.channels_min 2482 || !fe->codec_dai->driver->playback.channels_min) 2483 goto capture; 2484 2485 /* skip if FE isn't currently playing */ 2486 if (!fe->cpu_dai->playback_active 2487 || !fe->codec_dai->playback_active) 2488 goto capture; 2489 2490 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list); 2491 if (paths < 0) { 2492 dev_warn(fe->dev, "ASoC: %s no valid %s path\n", 2493 fe->dai_link->name, "playback"); 2494 mutex_unlock(&card->mutex); 2495 return paths; 2496 } 2497 2498 /* update any new playback paths */ 2499 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1); 2500 if (new) { 2501 dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK); 2502 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK); 2503 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK); 2504 } 2505 2506 /* update any old playback paths */ 2507 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0); 2508 if (old) { 2509 dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK); 2510 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK); 2511 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK); 2512 } 2513 2514 dpcm_path_put(&list); 2515 capture: 2516 /* skip if FE doesn't have capture capability */ 2517 if (!fe->cpu_dai->driver->capture.channels_min 2518 || !fe->codec_dai->driver->capture.channels_min) 2519 continue; 2520 2521 /* skip if FE isn't currently capturing */ 2522 if (!fe->cpu_dai->capture_active 2523 || !fe->codec_dai->capture_active) 2524 continue; 2525 2526 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list); 2527 if (paths < 0) { 2528 dev_warn(fe->dev, "ASoC: %s no valid %s path\n", 2529 fe->dai_link->name, "capture"); 2530 mutex_unlock(&card->mutex); 2531 return paths; 2532 } 2533 2534 /* update any new capture paths */ 2535 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1); 2536 if (new) { 2537 dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE); 2538 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE); 2539 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE); 2540 } 2541 2542 /* update any old capture paths */ 2543 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0); 2544 if (old) { 2545 dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE); 2546 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE); 2547 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE); 2548 } 2549 2550 dpcm_path_put(&list); 2551 } 2552 2553 mutex_unlock(&card->mutex); 2554 return 0; 2555 } 2556 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute) 2557 { 2558 struct snd_soc_dpcm *dpcm; 2559 struct list_head *clients = 2560 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients; 2561 2562 list_for_each_entry(dpcm, clients, list_be) { 2563 2564 struct snd_soc_pcm_runtime *be = dpcm->be; 2565 int i; 2566 2567 if (be->dai_link->ignore_suspend) 2568 continue; 2569 2570 for (i = 0; i < be->num_codecs; i++) { 2571 struct snd_soc_dai *dai = be->codec_dais[i]; 2572 struct snd_soc_dai_driver *drv = dai->driver; 2573 2574 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", 2575 be->dai_link->name); 2576 2577 if (drv->ops && drv->ops->digital_mute && 2578 dai->playback_active) 2579 drv->ops->digital_mute(dai, mute); 2580 } 2581 } 2582 2583 return 0; 2584 } 2585 2586 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream) 2587 { 2588 struct snd_soc_pcm_runtime *fe = fe_substream->private_data; 2589 struct snd_soc_dpcm *dpcm; 2590 struct snd_soc_dapm_widget_list *list; 2591 int ret; 2592 int stream = fe_substream->stream; 2593 2594 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME); 2595 fe->dpcm[stream].runtime = fe_substream->runtime; 2596 2597 ret = dpcm_path_get(fe, stream, &list); 2598 if (ret < 0) { 2599 mutex_unlock(&fe->card->mutex); 2600 return ret; 2601 } else if (ret == 0) { 2602 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n", 2603 fe->dai_link->name, stream ? "capture" : "playback"); 2604 } 2605 2606 /* calculate valid and active FE <-> BE dpcms */ 2607 dpcm_process_paths(fe, stream, &list, 1); 2608 2609 ret = dpcm_fe_dai_startup(fe_substream); 2610 if (ret < 0) { 2611 /* clean up all links */ 2612 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) 2613 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE; 2614 2615 dpcm_be_disconnect(fe, stream); 2616 fe->dpcm[stream].runtime = NULL; 2617 } 2618 2619 dpcm_clear_pending_state(fe, stream); 2620 dpcm_path_put(&list); 2621 mutex_unlock(&fe->card->mutex); 2622 return ret; 2623 } 2624 2625 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream) 2626 { 2627 struct snd_soc_pcm_runtime *fe = fe_substream->private_data; 2628 struct snd_soc_dpcm *dpcm; 2629 int stream = fe_substream->stream, ret; 2630 2631 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME); 2632 ret = dpcm_fe_dai_shutdown(fe_substream); 2633 2634 /* mark FE's links ready to prune */ 2635 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) 2636 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE; 2637 2638 dpcm_be_disconnect(fe, stream); 2639 2640 fe->dpcm[stream].runtime = NULL; 2641 mutex_unlock(&fe->card->mutex); 2642 return ret; 2643 } 2644 2645 /* create a new pcm */ 2646 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num) 2647 { 2648 struct snd_soc_platform *platform = rtd->platform; 2649 struct snd_soc_dai *codec_dai; 2650 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 2651 struct snd_pcm *pcm; 2652 char new_name[64]; 2653 int ret = 0, playback = 0, capture = 0; 2654 int i; 2655 2656 if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) { 2657 playback = rtd->dai_link->dpcm_playback; 2658 capture = rtd->dai_link->dpcm_capture; 2659 } else { 2660 for (i = 0; i < rtd->num_codecs; i++) { 2661 codec_dai = rtd->codec_dais[i]; 2662 if (codec_dai->driver->playback.channels_min) 2663 playback = 1; 2664 if (codec_dai->driver->capture.channels_min) 2665 capture = 1; 2666 } 2667 2668 capture = capture && cpu_dai->driver->capture.channels_min; 2669 playback = playback && cpu_dai->driver->playback.channels_min; 2670 } 2671 2672 if (rtd->dai_link->playback_only) { 2673 playback = 1; 2674 capture = 0; 2675 } 2676 2677 if (rtd->dai_link->capture_only) { 2678 playback = 0; 2679 capture = 1; 2680 } 2681 2682 /* create the PCM */ 2683 if (rtd->dai_link->no_pcm) { 2684 snprintf(new_name, sizeof(new_name), "(%s)", 2685 rtd->dai_link->stream_name); 2686 2687 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num, 2688 playback, capture, &pcm); 2689 } else { 2690 if (rtd->dai_link->dynamic) 2691 snprintf(new_name, sizeof(new_name), "%s (*)", 2692 rtd->dai_link->stream_name); 2693 else 2694 snprintf(new_name, sizeof(new_name), "%s %s-%d", 2695 rtd->dai_link->stream_name, 2696 (rtd->num_codecs > 1) ? 2697 "multicodec" : rtd->codec_dai->name, num); 2698 2699 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback, 2700 capture, &pcm); 2701 } 2702 if (ret < 0) { 2703 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n", 2704 rtd->dai_link->name); 2705 return ret; 2706 } 2707 dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name); 2708 2709 /* DAPM dai link stream work */ 2710 INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work); 2711 2712 pcm->nonatomic = rtd->dai_link->nonatomic; 2713 rtd->pcm = pcm; 2714 pcm->private_data = rtd; 2715 2716 if (rtd->dai_link->no_pcm) { 2717 if (playback) 2718 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd; 2719 if (capture) 2720 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd; 2721 goto out; 2722 } 2723 2724 /* ASoC PCM operations */ 2725 if (rtd->dai_link->dynamic) { 2726 rtd->ops.open = dpcm_fe_dai_open; 2727 rtd->ops.hw_params = dpcm_fe_dai_hw_params; 2728 rtd->ops.prepare = dpcm_fe_dai_prepare; 2729 rtd->ops.trigger = dpcm_fe_dai_trigger; 2730 rtd->ops.hw_free = dpcm_fe_dai_hw_free; 2731 rtd->ops.close = dpcm_fe_dai_close; 2732 rtd->ops.pointer = soc_pcm_pointer; 2733 rtd->ops.ioctl = soc_pcm_ioctl; 2734 } else { 2735 rtd->ops.open = soc_pcm_open; 2736 rtd->ops.hw_params = soc_pcm_hw_params; 2737 rtd->ops.prepare = soc_pcm_prepare; 2738 rtd->ops.trigger = soc_pcm_trigger; 2739 rtd->ops.hw_free = soc_pcm_hw_free; 2740 rtd->ops.close = soc_pcm_close; 2741 rtd->ops.pointer = soc_pcm_pointer; 2742 rtd->ops.ioctl = soc_pcm_ioctl; 2743 } 2744 2745 if (platform->driver->ops) { 2746 rtd->ops.ack = platform->driver->ops->ack; 2747 rtd->ops.copy = platform->driver->ops->copy; 2748 rtd->ops.silence = platform->driver->ops->silence; 2749 rtd->ops.page = platform->driver->ops->page; 2750 rtd->ops.mmap = platform->driver->ops->mmap; 2751 } 2752 2753 if (playback) 2754 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops); 2755 2756 if (capture) 2757 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops); 2758 2759 if (platform->driver->pcm_new) { 2760 ret = platform->driver->pcm_new(rtd); 2761 if (ret < 0) { 2762 dev_err(platform->dev, 2763 "ASoC: pcm constructor failed: %d\n", 2764 ret); 2765 return ret; 2766 } 2767 } 2768 2769 pcm->private_free = platform->driver->pcm_free; 2770 out: 2771 dev_info(rtd->card->dev, "%s <-> %s mapping ok\n", 2772 (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name, 2773 cpu_dai->name); 2774 return ret; 2775 } 2776 2777 /* is the current PCM operation for this FE ? */ 2778 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream) 2779 { 2780 if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) 2781 return 1; 2782 return 0; 2783 } 2784 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update); 2785 2786 /* is the current PCM operation for this BE ? */ 2787 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe, 2788 struct snd_soc_pcm_runtime *be, int stream) 2789 { 2790 if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) || 2791 ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) && 2792 be->dpcm[stream].runtime_update)) 2793 return 1; 2794 return 0; 2795 } 2796 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update); 2797 2798 /* get the substream for this BE */ 2799 struct snd_pcm_substream * 2800 snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream) 2801 { 2802 return be->pcm->streams[stream].substream; 2803 } 2804 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream); 2805 2806 /* get the BE runtime state */ 2807 enum snd_soc_dpcm_state 2808 snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream) 2809 { 2810 return be->dpcm[stream].state; 2811 } 2812 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state); 2813 2814 /* set the BE runtime state */ 2815 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, 2816 int stream, enum snd_soc_dpcm_state state) 2817 { 2818 be->dpcm[stream].state = state; 2819 } 2820 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state); 2821 2822 /* 2823 * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE 2824 * are not running, paused or suspended for the specified stream direction. 2825 */ 2826 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe, 2827 struct snd_soc_pcm_runtime *be, int stream) 2828 { 2829 struct snd_soc_dpcm *dpcm; 2830 int state; 2831 2832 list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) { 2833 2834 if (dpcm->fe == fe) 2835 continue; 2836 2837 state = dpcm->fe->dpcm[stream].state; 2838 if (state == SND_SOC_DPCM_STATE_START || 2839 state == SND_SOC_DPCM_STATE_PAUSED || 2840 state == SND_SOC_DPCM_STATE_SUSPEND) 2841 return 0; 2842 } 2843 2844 /* it's safe to free/stop this BE DAI */ 2845 return 1; 2846 } 2847 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop); 2848 2849 /* 2850 * We can only change hw params a BE DAI if any of it's FE are not prepared, 2851 * running, paused or suspended for the specified stream direction. 2852 */ 2853 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe, 2854 struct snd_soc_pcm_runtime *be, int stream) 2855 { 2856 struct snd_soc_dpcm *dpcm; 2857 int state; 2858 2859 list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) { 2860 2861 if (dpcm->fe == fe) 2862 continue; 2863 2864 state = dpcm->fe->dpcm[stream].state; 2865 if (state == SND_SOC_DPCM_STATE_START || 2866 state == SND_SOC_DPCM_STATE_PAUSED || 2867 state == SND_SOC_DPCM_STATE_SUSPEND || 2868 state == SND_SOC_DPCM_STATE_PREPARE) 2869 return 0; 2870 } 2871 2872 /* it's safe to change hw_params */ 2873 return 1; 2874 } 2875 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params); 2876 2877 int snd_soc_platform_trigger(struct snd_pcm_substream *substream, 2878 int cmd, struct snd_soc_platform *platform) 2879 { 2880 if (platform->driver->ops && platform->driver->ops->trigger) 2881 return platform->driver->ops->trigger(substream, cmd); 2882 return 0; 2883 } 2884 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger); 2885 2886 #ifdef CONFIG_DEBUG_FS 2887 static const char *dpcm_state_string(enum snd_soc_dpcm_state state) 2888 { 2889 switch (state) { 2890 case SND_SOC_DPCM_STATE_NEW: 2891 return "new"; 2892 case SND_SOC_DPCM_STATE_OPEN: 2893 return "open"; 2894 case SND_SOC_DPCM_STATE_HW_PARAMS: 2895 return "hw_params"; 2896 case SND_SOC_DPCM_STATE_PREPARE: 2897 return "prepare"; 2898 case SND_SOC_DPCM_STATE_START: 2899 return "start"; 2900 case SND_SOC_DPCM_STATE_STOP: 2901 return "stop"; 2902 case SND_SOC_DPCM_STATE_SUSPEND: 2903 return "suspend"; 2904 case SND_SOC_DPCM_STATE_PAUSED: 2905 return "paused"; 2906 case SND_SOC_DPCM_STATE_HW_FREE: 2907 return "hw_free"; 2908 case SND_SOC_DPCM_STATE_CLOSE: 2909 return "close"; 2910 } 2911 2912 return "unknown"; 2913 } 2914 2915 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe, 2916 int stream, char *buf, size_t size) 2917 { 2918 struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params; 2919 struct snd_soc_dpcm *dpcm; 2920 ssize_t offset = 0; 2921 2922 /* FE state */ 2923 offset += snprintf(buf + offset, size - offset, 2924 "[%s - %s]\n", fe->dai_link->name, 2925 stream ? "Capture" : "Playback"); 2926 2927 offset += snprintf(buf + offset, size - offset, "State: %s\n", 2928 dpcm_state_string(fe->dpcm[stream].state)); 2929 2930 if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) && 2931 (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP)) 2932 offset += snprintf(buf + offset, size - offset, 2933 "Hardware Params: " 2934 "Format = %s, Channels = %d, Rate = %d\n", 2935 snd_pcm_format_name(params_format(params)), 2936 params_channels(params), 2937 params_rate(params)); 2938 2939 /* BEs state */ 2940 offset += snprintf(buf + offset, size - offset, "Backends:\n"); 2941 2942 if (list_empty(&fe->dpcm[stream].be_clients)) { 2943 offset += snprintf(buf + offset, size - offset, 2944 " No active DSP links\n"); 2945 goto out; 2946 } 2947 2948 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) { 2949 struct snd_soc_pcm_runtime *be = dpcm->be; 2950 params = &dpcm->hw_params; 2951 2952 offset += snprintf(buf + offset, size - offset, 2953 "- %s\n", be->dai_link->name); 2954 2955 offset += snprintf(buf + offset, size - offset, 2956 " State: %s\n", 2957 dpcm_state_string(be->dpcm[stream].state)); 2958 2959 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) && 2960 (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP)) 2961 offset += snprintf(buf + offset, size - offset, 2962 " Hardware Params: " 2963 "Format = %s, Channels = %d, Rate = %d\n", 2964 snd_pcm_format_name(params_format(params)), 2965 params_channels(params), 2966 params_rate(params)); 2967 } 2968 2969 out: 2970 return offset; 2971 } 2972 2973 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf, 2974 size_t count, loff_t *ppos) 2975 { 2976 struct snd_soc_pcm_runtime *fe = file->private_data; 2977 ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0; 2978 char *buf; 2979 2980 buf = kmalloc(out_count, GFP_KERNEL); 2981 if (!buf) 2982 return -ENOMEM; 2983 2984 if (fe->cpu_dai->driver->playback.channels_min) 2985 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK, 2986 buf + offset, out_count - offset); 2987 2988 if (fe->cpu_dai->driver->capture.channels_min) 2989 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE, 2990 buf + offset, out_count - offset); 2991 2992 ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset); 2993 2994 kfree(buf); 2995 return ret; 2996 } 2997 2998 static const struct file_operations dpcm_state_fops = { 2999 .open = simple_open, 3000 .read = dpcm_state_read_file, 3001 .llseek = default_llseek, 3002 }; 3003 3004 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd) 3005 { 3006 if (!rtd->dai_link) 3007 return; 3008 3009 if (!rtd->card->debugfs_card_root) 3010 return; 3011 3012 rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name, 3013 rtd->card->debugfs_card_root); 3014 if (!rtd->debugfs_dpcm_root) { 3015 dev_dbg(rtd->dev, 3016 "ASoC: Failed to create dpcm debugfs directory %s\n", 3017 rtd->dai_link->name); 3018 return; 3019 } 3020 3021 rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444, 3022 rtd->debugfs_dpcm_root, 3023 rtd, &dpcm_state_fops); 3024 } 3025 #endif 3026