1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // soc-pcm.c -- ALSA SoC PCM 4 // 5 // Copyright 2005 Wolfson Microelectronics PLC. 6 // Copyright 2005 Openedhand Ltd. 7 // Copyright (C) 2010 Slimlogic Ltd. 8 // Copyright (C) 2010 Texas Instruments Inc. 9 // 10 // Authors: Liam Girdwood <lrg@ti.com> 11 // Mark Brown <broonie@opensource.wolfsonmicro.com> 12 13 #include <linux/kernel.h> 14 #include <linux/init.h> 15 #include <linux/delay.h> 16 #include <linux/pinctrl/consumer.h> 17 #include <linux/slab.h> 18 #include <linux/workqueue.h> 19 #include <linux/export.h> 20 #include <linux/debugfs.h> 21 #include <sound/core.h> 22 #include <sound/pcm.h> 23 #include <sound/pcm_params.h> 24 #include <sound/soc.h> 25 #include <sound/soc-dpcm.h> 26 #include <sound/soc-link.h> 27 #include <sound/initval.h> 28 29 #define soc_pcm_ret(rtd, ret) _soc_pcm_ret(rtd, __func__, ret) 30 static inline int _soc_pcm_ret(struct snd_soc_pcm_runtime *rtd, 31 const char *func, int ret) 32 { 33 /* Positive, Zero values are not errors */ 34 if (ret >= 0) 35 return ret; 36 37 /* Negative values might be errors */ 38 switch (ret) { 39 case -EPROBE_DEFER: 40 case -ENOTSUPP: 41 case -EINVAL: 42 break; 43 default: 44 dev_err(rtd->dev, 45 "ASoC: error at %s on %s: %d\n", 46 func, rtd->dai_link->name, ret); 47 } 48 49 return ret; 50 } 51 52 static inline void snd_soc_dpcm_stream_lock_irq(struct snd_soc_pcm_runtime *rtd, 53 int stream) 54 { 55 snd_pcm_stream_lock_irq(snd_soc_dpcm_get_substream(rtd, stream)); 56 } 57 58 #define snd_soc_dpcm_stream_lock_irqsave_nested(rtd, stream, flags) \ 59 snd_pcm_stream_lock_irqsave_nested(snd_soc_dpcm_get_substream(rtd, stream), flags) 60 61 static inline void snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime *rtd, 62 int stream) 63 { 64 snd_pcm_stream_unlock_irq(snd_soc_dpcm_get_substream(rtd, stream)); 65 } 66 67 #define snd_soc_dpcm_stream_unlock_irqrestore(rtd, stream, flags) \ 68 snd_pcm_stream_unlock_irqrestore(snd_soc_dpcm_get_substream(rtd, stream), flags) 69 70 #define DPCM_MAX_BE_USERS 8 71 72 static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd) 73 { 74 return (rtd)->dai_link->num_cpus == 1 ? asoc_rtd_to_cpu(rtd, 0)->name : "multicpu"; 75 } 76 static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd) 77 { 78 return (rtd)->dai_link->num_codecs == 1 ? asoc_rtd_to_codec(rtd, 0)->name : "multicodec"; 79 } 80 81 #ifdef CONFIG_DEBUG_FS 82 static const char *dpcm_state_string(enum snd_soc_dpcm_state state) 83 { 84 switch (state) { 85 case SND_SOC_DPCM_STATE_NEW: 86 return "new"; 87 case SND_SOC_DPCM_STATE_OPEN: 88 return "open"; 89 case SND_SOC_DPCM_STATE_HW_PARAMS: 90 return "hw_params"; 91 case SND_SOC_DPCM_STATE_PREPARE: 92 return "prepare"; 93 case SND_SOC_DPCM_STATE_START: 94 return "start"; 95 case SND_SOC_DPCM_STATE_STOP: 96 return "stop"; 97 case SND_SOC_DPCM_STATE_SUSPEND: 98 return "suspend"; 99 case SND_SOC_DPCM_STATE_PAUSED: 100 return "paused"; 101 case SND_SOC_DPCM_STATE_HW_FREE: 102 return "hw_free"; 103 case SND_SOC_DPCM_STATE_CLOSE: 104 return "close"; 105 } 106 107 return "unknown"; 108 } 109 110 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe, 111 int stream, char *buf, size_t size) 112 { 113 struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params; 114 struct snd_soc_dpcm *dpcm; 115 ssize_t offset = 0; 116 117 /* FE state */ 118 offset += scnprintf(buf + offset, size - offset, 119 "[%s - %s]\n", fe->dai_link->name, 120 stream ? "Capture" : "Playback"); 121 122 offset += scnprintf(buf + offset, size - offset, "State: %s\n", 123 dpcm_state_string(fe->dpcm[stream].state)); 124 125 if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) && 126 (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP)) 127 offset += scnprintf(buf + offset, size - offset, 128 "Hardware Params: " 129 "Format = %s, Channels = %d, Rate = %d\n", 130 snd_pcm_format_name(params_format(params)), 131 params_channels(params), 132 params_rate(params)); 133 134 /* BEs state */ 135 offset += scnprintf(buf + offset, size - offset, "Backends:\n"); 136 137 if (list_empty(&fe->dpcm[stream].be_clients)) { 138 offset += scnprintf(buf + offset, size - offset, 139 " No active DSP links\n"); 140 goto out; 141 } 142 143 for_each_dpcm_be(fe, stream, dpcm) { 144 struct snd_soc_pcm_runtime *be = dpcm->be; 145 params = &be->dpcm[stream].hw_params; 146 147 offset += scnprintf(buf + offset, size - offset, 148 "- %s\n", be->dai_link->name); 149 150 offset += scnprintf(buf + offset, size - offset, 151 " State: %s\n", 152 dpcm_state_string(be->dpcm[stream].state)); 153 154 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) && 155 (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP)) 156 offset += scnprintf(buf + offset, size - offset, 157 " Hardware Params: " 158 "Format = %s, Channels = %d, Rate = %d\n", 159 snd_pcm_format_name(params_format(params)), 160 params_channels(params), 161 params_rate(params)); 162 } 163 out: 164 return offset; 165 } 166 167 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf, 168 size_t count, loff_t *ppos) 169 { 170 struct snd_soc_pcm_runtime *fe = file->private_data; 171 ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0; 172 int stream; 173 char *buf; 174 175 if (fe->dai_link->num_cpus > 1) { 176 dev_err(fe->dev, 177 "%s doesn't support Multi CPU yet\n", __func__); 178 return -EINVAL; 179 } 180 181 buf = kmalloc(out_count, GFP_KERNEL); 182 if (!buf) 183 return -ENOMEM; 184 185 snd_soc_dpcm_mutex_lock(fe); 186 for_each_pcm_streams(stream) 187 if (snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream)) 188 offset += dpcm_show_state(fe, stream, 189 buf + offset, 190 out_count - offset); 191 snd_soc_dpcm_mutex_unlock(fe); 192 193 ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset); 194 195 kfree(buf); 196 return ret; 197 } 198 199 static const struct file_operations dpcm_state_fops = { 200 .open = simple_open, 201 .read = dpcm_state_read_file, 202 .llseek = default_llseek, 203 }; 204 205 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd) 206 { 207 if (!rtd->dai_link->dynamic) 208 return; 209 210 if (!rtd->card->debugfs_card_root) 211 return; 212 213 rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name, 214 rtd->card->debugfs_card_root); 215 216 debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root, 217 rtd, &dpcm_state_fops); 218 } 219 220 static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream) 221 { 222 char *name; 223 224 name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name, 225 stream ? "capture" : "playback"); 226 if (name) { 227 dpcm->debugfs_state = debugfs_create_dir( 228 name, dpcm->fe->debugfs_dpcm_root); 229 debugfs_create_u32("state", 0644, dpcm->debugfs_state, 230 &dpcm->state); 231 kfree(name); 232 } 233 } 234 235 static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm) 236 { 237 debugfs_remove_recursive(dpcm->debugfs_state); 238 } 239 240 #else 241 static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, 242 int stream) 243 { 244 } 245 246 static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm) 247 { 248 } 249 #endif 250 251 /* Set FE's runtime_update state; the state is protected via PCM stream lock 252 * for avoiding the race with trigger callback. 253 * If the state is unset and a trigger is pending while the previous operation, 254 * process the pending trigger action here. 255 */ 256 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd); 257 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe, 258 int stream, enum snd_soc_dpcm_update state) 259 { 260 struct snd_pcm_substream *substream = 261 snd_soc_dpcm_get_substream(fe, stream); 262 263 snd_soc_dpcm_stream_lock_irq(fe, stream); 264 if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) { 265 dpcm_fe_dai_do_trigger(substream, 266 fe->dpcm[stream].trigger_pending - 1); 267 fe->dpcm[stream].trigger_pending = 0; 268 } 269 fe->dpcm[stream].runtime_update = state; 270 snd_soc_dpcm_stream_unlock_irq(fe, stream); 271 } 272 273 static void dpcm_set_be_update_state(struct snd_soc_pcm_runtime *be, 274 int stream, enum snd_soc_dpcm_update state) 275 { 276 be->dpcm[stream].runtime_update = state; 277 } 278 279 /** 280 * snd_soc_runtime_action() - Increment/Decrement active count for 281 * PCM runtime components 282 * @rtd: ASoC PCM runtime that is activated 283 * @stream: Direction of the PCM stream 284 * @action: Activate stream if 1. Deactivate if -1. 285 * 286 * Increments/Decrements the active count for all the DAIs and components 287 * attached to a PCM runtime. 288 * Should typically be called when a stream is opened. 289 * 290 * Must be called with the rtd->card->pcm_mutex being held 291 */ 292 void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd, 293 int stream, int action) 294 { 295 struct snd_soc_dai *dai; 296 int i; 297 298 snd_soc_dpcm_mutex_assert_held(rtd); 299 300 for_each_rtd_dais(rtd, i, dai) 301 snd_soc_dai_action(dai, stream, action); 302 } 303 EXPORT_SYMBOL_GPL(snd_soc_runtime_action); 304 305 /** 306 * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay 307 * @rtd: The ASoC PCM runtime that should be checked. 308 * 309 * This function checks whether the power down delay should be ignored for a 310 * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has 311 * been configured to ignore the delay, or if none of the components benefits 312 * from having the delay. 313 */ 314 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd) 315 { 316 struct snd_soc_component *component; 317 bool ignore = true; 318 int i; 319 320 if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time) 321 return true; 322 323 for_each_rtd_components(rtd, i, component) 324 ignore &= !component->driver->use_pmdown_time; 325 326 return ignore; 327 } 328 329 /** 330 * snd_soc_set_runtime_hwparams - set the runtime hardware parameters 331 * @substream: the pcm substream 332 * @hw: the hardware parameters 333 * 334 * Sets the substream runtime hardware parameters. 335 */ 336 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream, 337 const struct snd_pcm_hardware *hw) 338 { 339 substream->runtime->hw = *hw; 340 341 return 0; 342 } 343 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams); 344 345 /* DPCM stream event, send event to FE and all active BEs. */ 346 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir, 347 int event) 348 { 349 struct snd_soc_dpcm *dpcm; 350 351 snd_soc_dpcm_mutex_assert_held(fe); 352 353 for_each_dpcm_be(fe, dir, dpcm) { 354 355 struct snd_soc_pcm_runtime *be = dpcm->be; 356 357 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n", 358 be->dai_link->name, event, dir); 359 360 if ((event == SND_SOC_DAPM_STREAM_STOP) && 361 (be->dpcm[dir].users >= 1)) 362 continue; 363 364 snd_soc_dapm_stream_event(be, dir, event); 365 } 366 367 snd_soc_dapm_stream_event(fe, dir, event); 368 369 return 0; 370 } 371 372 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai, 373 struct snd_pcm_hw_params *params) 374 { 375 if (params) { 376 dai->rate = params_rate(params); 377 dai->channels = params_channels(params); 378 dai->sample_bits = snd_pcm_format_physical_width(params_format(params)); 379 } else { 380 dai->rate = 0; 381 dai->channels = 0; 382 dai->sample_bits = 0; 383 } 384 } 385 386 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream, 387 struct snd_soc_dai *soc_dai) 388 { 389 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 390 int ret; 391 392 if (!snd_soc_dai_active(soc_dai)) 393 return 0; 394 395 #define __soc_pcm_apply_symmetry(name, NAME) \ 396 if (soc_dai->name && (soc_dai->driver->symmetric_##name || \ 397 rtd->dai_link->symmetric_##name)) { \ 398 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\ 399 #name, soc_dai->name); \ 400 \ 401 ret = snd_pcm_hw_constraint_single(substream->runtime, \ 402 SNDRV_PCM_HW_PARAM_##NAME,\ 403 soc_dai->name); \ 404 if (ret < 0) { \ 405 dev_err(soc_dai->dev, \ 406 "ASoC: Unable to apply %s constraint: %d\n",\ 407 #name, ret); \ 408 return ret; \ 409 } \ 410 } 411 412 __soc_pcm_apply_symmetry(rate, RATE); 413 __soc_pcm_apply_symmetry(channels, CHANNELS); 414 __soc_pcm_apply_symmetry(sample_bits, SAMPLE_BITS); 415 416 return 0; 417 } 418 419 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream, 420 struct snd_pcm_hw_params *params) 421 { 422 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 423 struct snd_soc_dai d; 424 struct snd_soc_dai *dai; 425 struct snd_soc_dai *cpu_dai; 426 unsigned int symmetry, i; 427 428 d.name = __func__; 429 soc_pcm_set_dai_params(&d, params); 430 431 #define __soc_pcm_params_symmetry(xxx) \ 432 symmetry = rtd->dai_link->symmetric_##xxx; \ 433 for_each_rtd_dais(rtd, i, dai) \ 434 symmetry |= dai->driver->symmetric_##xxx; \ 435 \ 436 if (symmetry) \ 437 for_each_rtd_cpu_dais(rtd, i, cpu_dai) \ 438 if (!snd_soc_dai_is_dummy(cpu_dai) && \ 439 cpu_dai->xxx && cpu_dai->xxx != d.xxx) { \ 440 dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \ 441 #xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \ 442 return -EINVAL; \ 443 } 444 445 /* reject unmatched parameters when applying symmetry */ 446 __soc_pcm_params_symmetry(rate); 447 __soc_pcm_params_symmetry(channels); 448 __soc_pcm_params_symmetry(sample_bits); 449 450 return 0; 451 } 452 453 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream) 454 { 455 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 456 struct snd_soc_dai_link *link = rtd->dai_link; 457 struct snd_soc_dai *dai; 458 unsigned int symmetry, i; 459 460 symmetry = link->symmetric_rate || 461 link->symmetric_channels || 462 link->symmetric_sample_bits; 463 464 for_each_rtd_dais(rtd, i, dai) 465 symmetry = symmetry || 466 dai->driver->symmetric_rate || 467 dai->driver->symmetric_channels || 468 dai->driver->symmetric_sample_bits; 469 470 if (symmetry) 471 substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX; 472 } 473 474 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits) 475 { 476 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 477 int ret; 478 479 if (!bits) 480 return; 481 482 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits); 483 if (ret != 0) 484 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n", 485 bits, ret); 486 } 487 488 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream) 489 { 490 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 491 struct snd_soc_dai *cpu_dai; 492 struct snd_soc_dai *codec_dai; 493 int stream = substream->stream; 494 int i; 495 unsigned int bits = 0, cpu_bits = 0; 496 497 for_each_rtd_codec_dais(rtd, i, codec_dai) { 498 struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream); 499 500 if (pcm_codec->sig_bits == 0) { 501 bits = 0; 502 break; 503 } 504 bits = max(pcm_codec->sig_bits, bits); 505 } 506 507 for_each_rtd_cpu_dais(rtd, i, cpu_dai) { 508 struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream); 509 510 if (pcm_cpu->sig_bits == 0) { 511 cpu_bits = 0; 512 break; 513 } 514 cpu_bits = max(pcm_cpu->sig_bits, cpu_bits); 515 } 516 517 soc_pcm_set_msb(substream, bits); 518 soc_pcm_set_msb(substream, cpu_bits); 519 } 520 521 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw) 522 { 523 hw->rates = UINT_MAX; 524 hw->rate_min = 0; 525 hw->rate_max = UINT_MAX; 526 hw->channels_min = 0; 527 hw->channels_max = UINT_MAX; 528 hw->formats = ULLONG_MAX; 529 } 530 531 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw, 532 struct snd_soc_pcm_stream *p) 533 { 534 hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates); 535 536 /* setup hw->rate_min/max via hw->rates first */ 537 snd_pcm_hw_limit_rates(hw); 538 539 /* update hw->rate_min/max by snd_soc_pcm_stream */ 540 hw->rate_min = max(hw->rate_min, p->rate_min); 541 hw->rate_max = min_not_zero(hw->rate_max, p->rate_max); 542 } 543 544 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw, 545 struct snd_soc_pcm_stream *p) 546 { 547 hw->channels_min = max(hw->channels_min, p->channels_min); 548 hw->channels_max = min(hw->channels_max, p->channels_max); 549 } 550 551 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw, 552 struct snd_soc_pcm_stream *p) 553 { 554 hw->formats &= p->formats; 555 } 556 557 /** 558 * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream 559 * @rtd: ASoC PCM runtime 560 * @hw: PCM hardware parameters (output) 561 * @stream: Direction of the PCM stream 562 * 563 * Calculates the subset of stream parameters supported by all DAIs 564 * associated with the PCM stream. 565 */ 566 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd, 567 struct snd_pcm_hardware *hw, int stream) 568 { 569 struct snd_soc_dai *codec_dai; 570 struct snd_soc_dai *cpu_dai; 571 struct snd_soc_pcm_stream *codec_stream; 572 struct snd_soc_pcm_stream *cpu_stream; 573 unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX; 574 int i; 575 576 soc_pcm_hw_init(hw); 577 578 /* first calculate min/max only for CPUs in the DAI link */ 579 for_each_rtd_cpu_dais(rtd, i, cpu_dai) { 580 581 /* 582 * Skip CPUs which don't support the current stream type. 583 * Otherwise, since the rate, channel, and format values will 584 * zero in that case, we would have no usable settings left, 585 * causing the resulting setup to fail. 586 */ 587 if (!snd_soc_dai_stream_valid(cpu_dai, stream)) 588 continue; 589 590 cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream); 591 592 soc_pcm_hw_update_chan(hw, cpu_stream); 593 soc_pcm_hw_update_rate(hw, cpu_stream); 594 soc_pcm_hw_update_format(hw, cpu_stream); 595 } 596 cpu_chan_min = hw->channels_min; 597 cpu_chan_max = hw->channels_max; 598 599 /* second calculate min/max only for CODECs in the DAI link */ 600 for_each_rtd_codec_dais(rtd, i, codec_dai) { 601 602 /* 603 * Skip CODECs which don't support the current stream type. 604 * Otherwise, since the rate, channel, and format values will 605 * zero in that case, we would have no usable settings left, 606 * causing the resulting setup to fail. 607 */ 608 if (!snd_soc_dai_stream_valid(codec_dai, stream)) 609 continue; 610 611 codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream); 612 613 soc_pcm_hw_update_chan(hw, codec_stream); 614 soc_pcm_hw_update_rate(hw, codec_stream); 615 soc_pcm_hw_update_format(hw, codec_stream); 616 } 617 618 /* Verify both a valid CPU DAI and a valid CODEC DAI were found */ 619 if (!hw->channels_min) 620 return -EINVAL; 621 622 /* 623 * chan min/max cannot be enforced if there are multiple CODEC DAIs 624 * connected to CPU DAI(s), use CPU DAI's directly and let 625 * channel allocation be fixed up later 626 */ 627 if (rtd->dai_link->num_codecs > 1) { 628 hw->channels_min = cpu_chan_min; 629 hw->channels_max = cpu_chan_max; 630 } 631 632 return 0; 633 } 634 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw); 635 636 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream) 637 { 638 struct snd_pcm_hardware *hw = &substream->runtime->hw; 639 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 640 u64 formats = hw->formats; 641 642 /* 643 * At least one CPU and one CODEC should match. Otherwise, we should 644 * have bailed out on a higher level, since there would be no CPU or 645 * CODEC to support the transfer direction in that case. 646 */ 647 snd_soc_runtime_calc_hw(rtd, hw, substream->stream); 648 649 if (formats) 650 hw->formats &= formats; 651 } 652 653 static int soc_pcm_components_open(struct snd_pcm_substream *substream) 654 { 655 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 656 struct snd_soc_component *component; 657 int i, ret = 0; 658 659 for_each_rtd_components(rtd, i, component) { 660 ret = snd_soc_component_module_get_when_open(component, substream); 661 if (ret < 0) 662 break; 663 664 ret = snd_soc_component_open(component, substream); 665 if (ret < 0) 666 break; 667 } 668 669 return ret; 670 } 671 672 static int soc_pcm_components_close(struct snd_pcm_substream *substream, 673 int rollback) 674 { 675 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 676 struct snd_soc_component *component; 677 int i, ret = 0; 678 679 for_each_rtd_components(rtd, i, component) { 680 int r = snd_soc_component_close(component, substream, rollback); 681 if (r < 0) 682 ret = r; /* use last ret */ 683 684 snd_soc_component_module_put_when_close(component, substream, rollback); 685 } 686 687 return ret; 688 } 689 690 static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd, 691 struct snd_pcm_substream *substream, int rollback) 692 { 693 struct snd_soc_component *component; 694 struct snd_soc_dai *dai; 695 int i; 696 697 snd_soc_dpcm_mutex_assert_held(rtd); 698 699 if (!rollback) { 700 snd_soc_runtime_deactivate(rtd, substream->stream); 701 /* clear the corresponding DAIs parameters when going to be inactive */ 702 for_each_rtd_dais(rtd, i, dai) { 703 if (snd_soc_dai_active(dai) == 0) 704 soc_pcm_set_dai_params(dai, NULL); 705 706 if (snd_soc_dai_stream_active(dai, substream->stream) == 0) 707 snd_soc_dai_digital_mute(dai, 1, substream->stream); 708 } 709 } 710 711 for_each_rtd_dais(rtd, i, dai) 712 snd_soc_dai_shutdown(dai, substream, rollback); 713 714 snd_soc_link_shutdown(substream, rollback); 715 716 soc_pcm_components_close(substream, rollback); 717 718 snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback); 719 720 for_each_rtd_components(rtd, i, component) 721 if (!snd_soc_component_active(component)) 722 pinctrl_pm_select_sleep_state(component->dev); 723 724 return 0; 725 } 726 727 /* 728 * Called by ALSA when a PCM substream is closed. Private data can be 729 * freed here. The cpu DAI, codec DAI, machine and components are also 730 * shutdown. 731 */ 732 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd, 733 struct snd_pcm_substream *substream) 734 { 735 return soc_pcm_clean(rtd, substream, 0); 736 } 737 738 /* PCM close ops for non-DPCM streams */ 739 static int soc_pcm_close(struct snd_pcm_substream *substream) 740 { 741 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 742 743 snd_soc_dpcm_mutex_lock(rtd); 744 __soc_pcm_close(rtd, substream); 745 snd_soc_dpcm_mutex_unlock(rtd); 746 return 0; 747 } 748 749 static int soc_hw_sanity_check(struct snd_pcm_substream *substream) 750 { 751 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 752 struct snd_pcm_hardware *hw = &substream->runtime->hw; 753 const char *name_cpu = soc_cpu_dai_name(rtd); 754 const char *name_codec = soc_codec_dai_name(rtd); 755 const char *err_msg; 756 struct device *dev = rtd->dev; 757 758 err_msg = "rates"; 759 if (!hw->rates) 760 goto config_err; 761 762 err_msg = "formats"; 763 if (!hw->formats) 764 goto config_err; 765 766 err_msg = "channels"; 767 if (!hw->channels_min || !hw->channels_max || 768 hw->channels_min > hw->channels_max) 769 goto config_err; 770 771 dev_dbg(dev, "ASoC: %s <-> %s info:\n", name_codec, 772 name_cpu); 773 dev_dbg(dev, "ASoC: rate mask 0x%x\n", hw->rates); 774 dev_dbg(dev, "ASoC: ch min %d max %d\n", hw->channels_min, 775 hw->channels_max); 776 dev_dbg(dev, "ASoC: rate min %d max %d\n", hw->rate_min, 777 hw->rate_max); 778 779 return 0; 780 781 config_err: 782 dev_err(dev, "ASoC: %s <-> %s No matching %s\n", 783 name_codec, name_cpu, err_msg); 784 return -EINVAL; 785 } 786 787 /* 788 * Called by ALSA when a PCM substream is opened, the runtime->hw record is 789 * then initialized and any private data can be allocated. This also calls 790 * startup for the cpu DAI, component, machine and codec DAI. 791 */ 792 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd, 793 struct snd_pcm_substream *substream) 794 { 795 struct snd_soc_component *component; 796 struct snd_soc_dai *dai; 797 int i, ret = 0; 798 799 snd_soc_dpcm_mutex_assert_held(rtd); 800 801 for_each_rtd_components(rtd, i, component) 802 pinctrl_pm_select_default_state(component->dev); 803 804 ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream); 805 if (ret < 0) 806 goto err; 807 808 ret = soc_pcm_components_open(substream); 809 if (ret < 0) 810 goto err; 811 812 ret = snd_soc_link_startup(substream); 813 if (ret < 0) 814 goto err; 815 816 /* startup the audio subsystem */ 817 for_each_rtd_dais(rtd, i, dai) { 818 ret = snd_soc_dai_startup(dai, substream); 819 if (ret < 0) 820 goto err; 821 } 822 823 /* Dynamic PCM DAI links compat checks use dynamic capabilities */ 824 if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) 825 goto dynamic; 826 827 /* Check that the codec and cpu DAIs are compatible */ 828 soc_pcm_init_runtime_hw(substream); 829 830 soc_pcm_update_symmetry(substream); 831 832 ret = soc_hw_sanity_check(substream); 833 if (ret < 0) 834 goto err; 835 836 soc_pcm_apply_msb(substream); 837 838 /* Symmetry only applies if we've already got an active stream. */ 839 for_each_rtd_dais(rtd, i, dai) { 840 ret = soc_pcm_apply_symmetry(substream, dai); 841 if (ret != 0) 842 goto err; 843 } 844 dynamic: 845 snd_soc_runtime_activate(rtd, substream->stream); 846 ret = 0; 847 err: 848 if (ret < 0) 849 soc_pcm_clean(rtd, substream, 1); 850 851 return soc_pcm_ret(rtd, ret); 852 } 853 854 /* PCM open ops for non-DPCM streams */ 855 static int soc_pcm_open(struct snd_pcm_substream *substream) 856 { 857 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 858 int ret; 859 860 snd_soc_dpcm_mutex_lock(rtd); 861 ret = __soc_pcm_open(rtd, substream); 862 snd_soc_dpcm_mutex_unlock(rtd); 863 return ret; 864 } 865 866 /* 867 * Called by ALSA when the PCM substream is prepared, can set format, sample 868 * rate, etc. This function is non atomic and can be called multiple times, 869 * it can refer to the runtime info. 870 */ 871 static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd, 872 struct snd_pcm_substream *substream) 873 { 874 struct snd_soc_dai *dai; 875 int i, ret = 0; 876 877 snd_soc_dpcm_mutex_assert_held(rtd); 878 879 ret = snd_soc_link_prepare(substream); 880 if (ret < 0) 881 goto out; 882 883 ret = snd_soc_pcm_component_prepare(substream); 884 if (ret < 0) 885 goto out; 886 887 ret = snd_soc_pcm_dai_prepare(substream); 888 if (ret < 0) 889 goto out; 890 891 /* cancel any delayed stream shutdown that is pending */ 892 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 893 rtd->pop_wait) { 894 rtd->pop_wait = 0; 895 cancel_delayed_work(&rtd->delayed_work); 896 } 897 898 snd_soc_dapm_stream_event(rtd, substream->stream, 899 SND_SOC_DAPM_STREAM_START); 900 901 for_each_rtd_dais(rtd, i, dai) 902 snd_soc_dai_digital_mute(dai, 0, substream->stream); 903 904 out: 905 return soc_pcm_ret(rtd, ret); 906 } 907 908 /* PCM prepare ops for non-DPCM streams */ 909 static int soc_pcm_prepare(struct snd_pcm_substream *substream) 910 { 911 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 912 int ret; 913 914 snd_soc_dpcm_mutex_lock(rtd); 915 ret = __soc_pcm_prepare(rtd, substream); 916 snd_soc_dpcm_mutex_unlock(rtd); 917 return ret; 918 } 919 920 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params, 921 unsigned int mask) 922 { 923 struct snd_interval *interval; 924 int channels = hweight_long(mask); 925 926 interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 927 interval->min = channels; 928 interval->max = channels; 929 } 930 931 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd, 932 struct snd_pcm_substream *substream, int rollback) 933 { 934 struct snd_soc_dai *dai; 935 int i; 936 937 snd_soc_dpcm_mutex_assert_held(rtd); 938 939 /* run the stream event */ 940 snd_soc_dapm_stream_stop(rtd, substream->stream); 941 942 /* free any machine hw params */ 943 snd_soc_link_hw_free(substream, rollback); 944 945 /* free any component resources */ 946 snd_soc_pcm_component_hw_free(substream, rollback); 947 948 /* now free hw params for the DAIs */ 949 for_each_rtd_dais(rtd, i, dai) 950 if (snd_soc_dai_stream_valid(dai, substream->stream)) 951 snd_soc_dai_hw_free(dai, substream, rollback); 952 953 return 0; 954 } 955 956 /* 957 * Frees resources allocated by hw_params, can be called multiple times 958 */ 959 static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd, 960 struct snd_pcm_substream *substream) 961 { 962 return soc_pcm_hw_clean(rtd, substream, 0); 963 } 964 965 /* hw_free PCM ops for non-DPCM streams */ 966 static int soc_pcm_hw_free(struct snd_pcm_substream *substream) 967 { 968 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 969 int ret; 970 971 snd_soc_dpcm_mutex_lock(rtd); 972 ret = __soc_pcm_hw_free(rtd, substream); 973 snd_soc_dpcm_mutex_unlock(rtd); 974 return ret; 975 } 976 977 /* 978 * Called by ALSA when the hardware params are set by application. This 979 * function can also be called multiple times and can allocate buffers 980 * (using snd_pcm_lib_* ). It's non-atomic. 981 */ 982 static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd, 983 struct snd_pcm_substream *substream, 984 struct snd_pcm_hw_params *params) 985 { 986 struct snd_soc_dai *cpu_dai; 987 struct snd_soc_dai *codec_dai; 988 struct snd_pcm_hw_params tmp_params; 989 int i, ret = 0; 990 991 snd_soc_dpcm_mutex_assert_held(rtd); 992 993 ret = soc_pcm_params_symmetry(substream, params); 994 if (ret) 995 goto out; 996 997 ret = snd_soc_link_hw_params(substream, params); 998 if (ret < 0) 999 goto out; 1000 1001 for_each_rtd_codec_dais(rtd, i, codec_dai) { 1002 unsigned int tdm_mask = snd_soc_dai_tdm_mask_get(codec_dai, substream->stream); 1003 1004 /* 1005 * Skip CODECs which don't support the current stream type, 1006 * the idea being that if a CODEC is not used for the currently 1007 * set up transfer direction, it should not need to be 1008 * configured, especially since the configuration used might 1009 * not even be supported by that CODEC. There may be cases 1010 * however where a CODEC needs to be set up although it is 1011 * actually not being used for the transfer, e.g. if a 1012 * capture-only CODEC is acting as an LRCLK and/or BCLK master 1013 * for the DAI link including a playback-only CODEC. 1014 * If this becomes necessary, we will have to augment the 1015 * machine driver setup with information on how to act, so 1016 * we can do the right thing here. 1017 */ 1018 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream)) 1019 continue; 1020 1021 /* copy params for each codec */ 1022 tmp_params = *params; 1023 1024 /* fixup params based on TDM slot masks */ 1025 if (tdm_mask) 1026 soc_pcm_codec_params_fixup(&tmp_params, tdm_mask); 1027 1028 ret = snd_soc_dai_hw_params(codec_dai, substream, 1029 &tmp_params); 1030 if(ret < 0) 1031 goto out; 1032 1033 soc_pcm_set_dai_params(codec_dai, &tmp_params); 1034 snd_soc_dapm_update_dai(substream, &tmp_params, codec_dai); 1035 } 1036 1037 for_each_rtd_cpu_dais(rtd, i, cpu_dai) { 1038 unsigned int ch_mask = 0; 1039 int j; 1040 1041 /* 1042 * Skip CPUs which don't support the current stream 1043 * type. See soc_pcm_init_runtime_hw() for more details 1044 */ 1045 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream)) 1046 continue; 1047 1048 /* copy params for each cpu */ 1049 tmp_params = *params; 1050 1051 if (!rtd->dai_link->codec_ch_maps) 1052 goto hw_params; 1053 /* 1054 * construct cpu channel mask by combining ch_mask of each 1055 * codec which maps to the cpu. 1056 */ 1057 for_each_rtd_codec_dais(rtd, j, codec_dai) { 1058 if (rtd->dai_link->codec_ch_maps[j].connected_cpu_id == i) 1059 ch_mask |= rtd->dai_link->codec_ch_maps[j].ch_mask; 1060 } 1061 1062 /* fixup cpu channel number */ 1063 if (ch_mask) 1064 soc_pcm_codec_params_fixup(&tmp_params, ch_mask); 1065 1066 hw_params: 1067 ret = snd_soc_dai_hw_params(cpu_dai, substream, &tmp_params); 1068 if (ret < 0) 1069 goto out; 1070 1071 /* store the parameters for each DAI */ 1072 soc_pcm_set_dai_params(cpu_dai, &tmp_params); 1073 snd_soc_dapm_update_dai(substream, &tmp_params, cpu_dai); 1074 } 1075 1076 ret = snd_soc_pcm_component_hw_params(substream, params); 1077 out: 1078 if (ret < 0) 1079 soc_pcm_hw_clean(rtd, substream, 1); 1080 1081 return soc_pcm_ret(rtd, ret); 1082 } 1083 1084 /* hw_params PCM ops for non-DPCM streams */ 1085 static int soc_pcm_hw_params(struct snd_pcm_substream *substream, 1086 struct snd_pcm_hw_params *params) 1087 { 1088 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 1089 int ret; 1090 1091 snd_soc_dpcm_mutex_lock(rtd); 1092 ret = __soc_pcm_hw_params(rtd, substream, params); 1093 snd_soc_dpcm_mutex_unlock(rtd); 1094 return ret; 1095 } 1096 1097 #define TRIGGER_MAX 3 1098 static int (* const trigger[][TRIGGER_MAX])(struct snd_pcm_substream *substream, int cmd, int rollback) = { 1099 [SND_SOC_TRIGGER_ORDER_DEFAULT] = { 1100 snd_soc_link_trigger, 1101 snd_soc_pcm_component_trigger, 1102 snd_soc_pcm_dai_trigger, 1103 }, 1104 [SND_SOC_TRIGGER_ORDER_LDC] = { 1105 snd_soc_link_trigger, 1106 snd_soc_pcm_dai_trigger, 1107 snd_soc_pcm_component_trigger, 1108 }, 1109 }; 1110 1111 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 1112 { 1113 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 1114 struct snd_soc_component *component; 1115 int ret = 0, r = 0, i; 1116 int rollback = 0; 1117 int start = 0, stop = 0; 1118 1119 /* 1120 * select START/STOP sequence 1121 */ 1122 for_each_rtd_components(rtd, i, component) { 1123 if (component->driver->trigger_start) 1124 start = component->driver->trigger_start; 1125 if (component->driver->trigger_stop) 1126 stop = component->driver->trigger_stop; 1127 } 1128 if (rtd->dai_link->trigger_start) 1129 start = rtd->dai_link->trigger_start; 1130 if (rtd->dai_link->trigger_stop) 1131 stop = rtd->dai_link->trigger_stop; 1132 1133 if (start < 0 || start >= SND_SOC_TRIGGER_ORDER_MAX || 1134 stop < 0 || stop >= SND_SOC_TRIGGER_ORDER_MAX) 1135 return -EINVAL; 1136 1137 /* 1138 * START 1139 */ 1140 switch (cmd) { 1141 case SNDRV_PCM_TRIGGER_START: 1142 case SNDRV_PCM_TRIGGER_RESUME: 1143 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1144 for (i = 0; i < TRIGGER_MAX; i++) { 1145 r = trigger[start][i](substream, cmd, 0); 1146 if (r < 0) 1147 break; 1148 } 1149 } 1150 1151 /* 1152 * Rollback if START failed 1153 * find correspond STOP command 1154 */ 1155 if (r < 0) { 1156 rollback = 1; 1157 ret = r; 1158 switch (cmd) { 1159 case SNDRV_PCM_TRIGGER_START: 1160 cmd = SNDRV_PCM_TRIGGER_STOP; 1161 break; 1162 case SNDRV_PCM_TRIGGER_RESUME: 1163 cmd = SNDRV_PCM_TRIGGER_SUSPEND; 1164 break; 1165 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1166 cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH; 1167 break; 1168 } 1169 } 1170 1171 /* 1172 * STOP 1173 */ 1174 switch (cmd) { 1175 case SNDRV_PCM_TRIGGER_STOP: 1176 case SNDRV_PCM_TRIGGER_SUSPEND: 1177 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1178 for (i = TRIGGER_MAX; i > 0; i--) { 1179 r = trigger[stop][i - 1](substream, cmd, rollback); 1180 if (r < 0) 1181 ret = r; 1182 } 1183 } 1184 1185 return ret; 1186 } 1187 1188 /* 1189 * soc level wrapper for pointer callback 1190 * If cpu_dai, codec_dai, component driver has the delay callback, then 1191 * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay(). 1192 */ 1193 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream) 1194 { 1195 struct snd_pcm_runtime *runtime = substream->runtime; 1196 snd_pcm_uframes_t offset = 0; 1197 snd_pcm_sframes_t codec_delay = 0; 1198 snd_pcm_sframes_t cpu_delay = 0; 1199 1200 offset = snd_soc_pcm_component_pointer(substream); 1201 1202 /* should be called *after* snd_soc_pcm_component_pointer() */ 1203 snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay); 1204 snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay); 1205 1206 runtime->delay = cpu_delay + codec_delay; 1207 1208 return offset; 1209 } 1210 1211 /* connect a FE and BE */ 1212 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe, 1213 struct snd_soc_pcm_runtime *be, int stream) 1214 { 1215 struct snd_pcm_substream *fe_substream; 1216 struct snd_pcm_substream *be_substream; 1217 struct snd_soc_dpcm *dpcm; 1218 1219 snd_soc_dpcm_mutex_assert_held(fe); 1220 1221 /* only add new dpcms */ 1222 for_each_dpcm_be(fe, stream, dpcm) { 1223 if (dpcm->be == be && dpcm->fe == fe) 1224 return 0; 1225 } 1226 1227 fe_substream = snd_soc_dpcm_get_substream(fe, stream); 1228 be_substream = snd_soc_dpcm_get_substream(be, stream); 1229 1230 if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) { 1231 dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n", 1232 __func__); 1233 return -EINVAL; 1234 } 1235 if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) { 1236 dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n"); 1237 be_substream->pcm->nonatomic = 1; 1238 } 1239 1240 dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL); 1241 if (!dpcm) 1242 return -ENOMEM; 1243 1244 dpcm->be = be; 1245 dpcm->fe = fe; 1246 dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW; 1247 snd_soc_dpcm_stream_lock_irq(fe, stream); 1248 list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients); 1249 list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients); 1250 snd_soc_dpcm_stream_unlock_irq(fe, stream); 1251 1252 dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n", 1253 stream ? "capture" : "playback", fe->dai_link->name, 1254 stream ? "<-" : "->", be->dai_link->name); 1255 1256 dpcm_create_debugfs_state(dpcm, stream); 1257 1258 return 1; 1259 } 1260 1261 /* reparent a BE onto another FE */ 1262 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe, 1263 struct snd_soc_pcm_runtime *be, int stream) 1264 { 1265 struct snd_soc_dpcm *dpcm; 1266 struct snd_pcm_substream *fe_substream, *be_substream; 1267 1268 /* reparent if BE is connected to other FEs */ 1269 if (!be->dpcm[stream].users) 1270 return; 1271 1272 be_substream = snd_soc_dpcm_get_substream(be, stream); 1273 if (!be_substream) 1274 return; 1275 1276 for_each_dpcm_fe(be, stream, dpcm) { 1277 if (dpcm->fe == fe) 1278 continue; 1279 1280 dev_dbg(fe->dev, "reparent %s path %s %s %s\n", 1281 stream ? "capture" : "playback", 1282 dpcm->fe->dai_link->name, 1283 stream ? "<-" : "->", dpcm->be->dai_link->name); 1284 1285 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream); 1286 be_substream->runtime = fe_substream->runtime; 1287 break; 1288 } 1289 } 1290 1291 /* disconnect a BE and FE */ 1292 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream) 1293 { 1294 struct snd_soc_dpcm *dpcm, *d; 1295 LIST_HEAD(deleted_dpcms); 1296 1297 snd_soc_dpcm_mutex_assert_held(fe); 1298 1299 snd_soc_dpcm_stream_lock_irq(fe, stream); 1300 for_each_dpcm_be_safe(fe, stream, dpcm, d) { 1301 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n", 1302 stream ? "capture" : "playback", 1303 dpcm->be->dai_link->name); 1304 1305 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE) 1306 continue; 1307 1308 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n", 1309 stream ? "capture" : "playback", fe->dai_link->name, 1310 stream ? "<-" : "->", dpcm->be->dai_link->name); 1311 1312 /* BEs still alive need new FE */ 1313 dpcm_be_reparent(fe, dpcm->be, stream); 1314 1315 list_del(&dpcm->list_be); 1316 list_move(&dpcm->list_fe, &deleted_dpcms); 1317 } 1318 snd_soc_dpcm_stream_unlock_irq(fe, stream); 1319 1320 while (!list_empty(&deleted_dpcms)) { 1321 dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm, 1322 list_fe); 1323 list_del(&dpcm->list_fe); 1324 dpcm_remove_debugfs_state(dpcm); 1325 kfree(dpcm); 1326 } 1327 } 1328 1329 /* get BE for DAI widget and stream */ 1330 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card, 1331 struct snd_soc_dapm_widget *widget, int stream) 1332 { 1333 struct snd_soc_pcm_runtime *be; 1334 struct snd_soc_dapm_widget *w; 1335 struct snd_soc_dai *dai; 1336 int i; 1337 1338 dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name); 1339 1340 for_each_card_rtds(card, be) { 1341 1342 if (!be->dai_link->no_pcm) 1343 continue; 1344 1345 if (!snd_soc_dpcm_get_substream(be, stream)) 1346 continue; 1347 1348 for_each_rtd_dais(be, i, dai) { 1349 w = snd_soc_dai_get_widget(dai, stream); 1350 1351 dev_dbg(card->dev, "ASoC: try BE : %s\n", 1352 w ? w->name : "(not set)"); 1353 1354 if (w == widget) 1355 return be; 1356 } 1357 } 1358 1359 /* Widget provided is not a BE */ 1360 return NULL; 1361 } 1362 1363 int widget_in_list(struct snd_soc_dapm_widget_list *list, 1364 struct snd_soc_dapm_widget *widget) 1365 { 1366 struct snd_soc_dapm_widget *w; 1367 int i; 1368 1369 for_each_dapm_widgets(list, i, w) 1370 if (widget == w) 1371 return 1; 1372 1373 return 0; 1374 } 1375 EXPORT_SYMBOL_GPL(widget_in_list); 1376 1377 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir) 1378 { 1379 struct snd_soc_card *card = widget->dapm->card; 1380 struct snd_soc_pcm_runtime *rtd; 1381 int stream; 1382 1383 /* adjust dir to stream */ 1384 if (dir == SND_SOC_DAPM_DIR_OUT) 1385 stream = SNDRV_PCM_STREAM_PLAYBACK; 1386 else 1387 stream = SNDRV_PCM_STREAM_CAPTURE; 1388 1389 rtd = dpcm_get_be(card, widget, stream); 1390 if (rtd) 1391 return true; 1392 1393 return false; 1394 } 1395 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be); 1396 1397 int dpcm_path_get(struct snd_soc_pcm_runtime *fe, 1398 int stream, struct snd_soc_dapm_widget_list **list) 1399 { 1400 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0); 1401 int paths; 1402 1403 if (fe->dai_link->num_cpus > 1) { 1404 dev_err(fe->dev, 1405 "%s doesn't support Multi CPU yet\n", __func__); 1406 return -EINVAL; 1407 } 1408 1409 /* get number of valid DAI paths and their widgets */ 1410 paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list, 1411 fe->card->component_chaining ? 1412 NULL : dpcm_end_walk_at_be); 1413 1414 if (paths > 0) 1415 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths, 1416 stream ? "capture" : "playback"); 1417 else if (paths == 0) 1418 dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name, 1419 stream ? "capture" : "playback"); 1420 1421 return paths; 1422 } 1423 1424 void dpcm_path_put(struct snd_soc_dapm_widget_list **list) 1425 { 1426 snd_soc_dapm_dai_free_widgets(list); 1427 } 1428 1429 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream, 1430 struct snd_soc_dapm_widget_list *list) 1431 { 1432 struct snd_soc_dai *dai; 1433 unsigned int i; 1434 1435 /* is there a valid DAI widget for this BE */ 1436 for_each_rtd_dais(dpcm->be, i, dai) { 1437 struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream); 1438 1439 /* 1440 * The BE is pruned only if none of the dai 1441 * widgets are in the active list. 1442 */ 1443 if (widget && widget_in_list(list, widget)) 1444 return true; 1445 } 1446 1447 return false; 1448 } 1449 1450 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream, 1451 struct snd_soc_dapm_widget_list **list_) 1452 { 1453 struct snd_soc_dpcm *dpcm; 1454 int prune = 0; 1455 1456 /* Destroy any old FE <--> BE connections */ 1457 for_each_dpcm_be(fe, stream, dpcm) { 1458 if (dpcm_be_is_active(dpcm, stream, *list_)) 1459 continue; 1460 1461 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n", 1462 stream ? "capture" : "playback", 1463 dpcm->be->dai_link->name, fe->dai_link->name); 1464 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE; 1465 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE); 1466 prune++; 1467 } 1468 1469 dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune); 1470 return prune; 1471 } 1472 1473 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream, 1474 struct snd_soc_dapm_widget_list **list_) 1475 { 1476 struct snd_soc_card *card = fe->card; 1477 struct snd_soc_dapm_widget_list *list = *list_; 1478 struct snd_soc_pcm_runtime *be; 1479 struct snd_soc_dapm_widget *widget; 1480 struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream); 1481 int i, new = 0, err; 1482 1483 /* don't connect if FE is not running */ 1484 if (!fe_substream->runtime && !fe->fe_compr) 1485 return new; 1486 1487 /* Create any new FE <--> BE connections */ 1488 for_each_dapm_widgets(list, i, widget) { 1489 1490 switch (widget->id) { 1491 case snd_soc_dapm_dai_in: 1492 if (stream != SNDRV_PCM_STREAM_PLAYBACK) 1493 continue; 1494 break; 1495 case snd_soc_dapm_dai_out: 1496 if (stream != SNDRV_PCM_STREAM_CAPTURE) 1497 continue; 1498 break; 1499 default: 1500 continue; 1501 } 1502 1503 /* is there a valid BE rtd for this widget */ 1504 be = dpcm_get_be(card, widget, stream); 1505 if (!be) { 1506 dev_dbg(fe->dev, "ASoC: no BE found for %s\n", 1507 widget->name); 1508 continue; 1509 } 1510 1511 /* 1512 * Filter for systems with 'component_chaining' enabled. 1513 * This helps to avoid unnecessary re-configuration of an 1514 * already active BE on such systems. 1515 */ 1516 if (fe->card->component_chaining && 1517 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) && 1518 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE)) 1519 continue; 1520 1521 /* newly connected FE and BE */ 1522 err = dpcm_be_connect(fe, be, stream); 1523 if (err < 0) { 1524 dev_err(fe->dev, "ASoC: can't connect %s\n", 1525 widget->name); 1526 break; 1527 } else if (err == 0) /* already connected */ 1528 continue; 1529 1530 /* new */ 1531 dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE); 1532 new++; 1533 } 1534 1535 dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new); 1536 return new; 1537 } 1538 1539 /* 1540 * Find the corresponding BE DAIs that source or sink audio to this 1541 * FE substream. 1542 */ 1543 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe, 1544 int stream, struct snd_soc_dapm_widget_list **list, int new) 1545 { 1546 if (new) 1547 return dpcm_add_paths(fe, stream, list); 1548 else 1549 return dpcm_prune_paths(fe, stream, list); 1550 } 1551 1552 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream) 1553 { 1554 struct snd_soc_dpcm *dpcm; 1555 1556 for_each_dpcm_be(fe, stream, dpcm) 1557 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO); 1558 } 1559 1560 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream, 1561 int do_hw_free, struct snd_soc_dpcm *last) 1562 { 1563 struct snd_soc_dpcm *dpcm; 1564 1565 /* disable any enabled and non active backends */ 1566 for_each_dpcm_be(fe, stream, dpcm) { 1567 struct snd_soc_pcm_runtime *be = dpcm->be; 1568 struct snd_pcm_substream *be_substream = 1569 snd_soc_dpcm_get_substream(be, stream); 1570 1571 if (dpcm == last) 1572 return; 1573 1574 /* is this op for this BE ? */ 1575 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1576 continue; 1577 1578 if (be->dpcm[stream].users == 0) { 1579 dev_err(be->dev, "ASoC: no users %s at close - state %d\n", 1580 stream ? "capture" : "playback", 1581 be->dpcm[stream].state); 1582 continue; 1583 } 1584 1585 if (--be->dpcm[stream].users != 0) 1586 continue; 1587 1588 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) { 1589 if (!do_hw_free) 1590 continue; 1591 1592 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) { 1593 __soc_pcm_hw_free(be, be_substream); 1594 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE; 1595 } 1596 } 1597 1598 __soc_pcm_close(be, be_substream); 1599 be_substream->runtime = NULL; 1600 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1601 } 1602 } 1603 1604 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream) 1605 { 1606 struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream); 1607 struct snd_soc_pcm_runtime *be; 1608 struct snd_soc_dpcm *dpcm; 1609 int err, count = 0; 1610 1611 /* only startup BE DAIs that are either sinks or sources to this FE DAI */ 1612 for_each_dpcm_be(fe, stream, dpcm) { 1613 struct snd_pcm_substream *be_substream; 1614 1615 be = dpcm->be; 1616 be_substream = snd_soc_dpcm_get_substream(be, stream); 1617 1618 if (!be_substream) { 1619 dev_err(be->dev, "ASoC: no backend %s stream\n", 1620 stream ? "capture" : "playback"); 1621 continue; 1622 } 1623 1624 /* is this op for this BE ? */ 1625 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1626 continue; 1627 1628 /* first time the dpcm is open ? */ 1629 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) { 1630 dev_err(be->dev, "ASoC: too many users %s at open %d\n", 1631 stream ? "capture" : "playback", 1632 be->dpcm[stream].state); 1633 continue; 1634 } 1635 1636 if (be->dpcm[stream].users++ != 0) 1637 continue; 1638 1639 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) && 1640 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE)) 1641 continue; 1642 1643 dev_dbg(be->dev, "ASoC: open %s BE %s\n", 1644 stream ? "capture" : "playback", be->dai_link->name); 1645 1646 be_substream->runtime = fe_substream->runtime; 1647 err = __soc_pcm_open(be, be_substream); 1648 if (err < 0) { 1649 be->dpcm[stream].users--; 1650 if (be->dpcm[stream].users < 0) 1651 dev_err(be->dev, "ASoC: no users %s at unwind %d\n", 1652 stream ? "capture" : "playback", 1653 be->dpcm[stream].state); 1654 1655 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1656 goto unwind; 1657 } 1658 be->dpcm[stream].be_start = 0; 1659 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN; 1660 count++; 1661 } 1662 1663 return count; 1664 1665 unwind: 1666 dpcm_be_dai_startup_rollback(fe, stream, dpcm); 1667 1668 return soc_pcm_ret(fe, err); 1669 } 1670 1671 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream) 1672 { 1673 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1674 struct snd_pcm_runtime *runtime = substream->runtime; 1675 struct snd_pcm_hardware *hw = &runtime->hw; 1676 struct snd_soc_dai *dai; 1677 int stream = substream->stream; 1678 u64 formats = hw->formats; 1679 int i; 1680 1681 soc_pcm_hw_init(hw); 1682 1683 if (formats) 1684 hw->formats &= formats; 1685 1686 for_each_rtd_cpu_dais(fe, i, dai) { 1687 struct snd_soc_pcm_stream *cpu_stream; 1688 1689 /* 1690 * Skip CPUs which don't support the current stream 1691 * type. See soc_pcm_init_runtime_hw() for more details 1692 */ 1693 if (!snd_soc_dai_stream_valid(dai, stream)) 1694 continue; 1695 1696 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream); 1697 1698 soc_pcm_hw_update_rate(hw, cpu_stream); 1699 soc_pcm_hw_update_chan(hw, cpu_stream); 1700 soc_pcm_hw_update_format(hw, cpu_stream); 1701 } 1702 1703 } 1704 1705 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream) 1706 { 1707 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1708 struct snd_pcm_runtime *runtime = substream->runtime; 1709 struct snd_pcm_hardware *hw = &runtime->hw; 1710 struct snd_soc_dpcm *dpcm; 1711 struct snd_soc_dai *dai; 1712 int stream = substream->stream; 1713 1714 if (!fe->dai_link->dpcm_merged_format) 1715 return; 1716 1717 /* 1718 * It returns merged BE codec format 1719 * if FE want to use it (= dpcm_merged_format) 1720 */ 1721 1722 for_each_dpcm_be(fe, stream, dpcm) { 1723 struct snd_soc_pcm_runtime *be = dpcm->be; 1724 struct snd_soc_pcm_stream *codec_stream; 1725 int i; 1726 1727 for_each_rtd_codec_dais(be, i, dai) { 1728 /* 1729 * Skip CODECs which don't support the current stream 1730 * type. See soc_pcm_init_runtime_hw() for more details 1731 */ 1732 if (!snd_soc_dai_stream_valid(dai, stream)) 1733 continue; 1734 1735 codec_stream = snd_soc_dai_get_pcm_stream(dai, stream); 1736 1737 soc_pcm_hw_update_format(hw, codec_stream); 1738 } 1739 } 1740 } 1741 1742 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream) 1743 { 1744 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1745 struct snd_pcm_runtime *runtime = substream->runtime; 1746 struct snd_pcm_hardware *hw = &runtime->hw; 1747 struct snd_soc_dpcm *dpcm; 1748 int stream = substream->stream; 1749 1750 if (!fe->dai_link->dpcm_merged_chan) 1751 return; 1752 1753 /* 1754 * It returns merged BE codec channel; 1755 * if FE want to use it (= dpcm_merged_chan) 1756 */ 1757 1758 for_each_dpcm_be(fe, stream, dpcm) { 1759 struct snd_soc_pcm_runtime *be = dpcm->be; 1760 struct snd_soc_pcm_stream *cpu_stream; 1761 struct snd_soc_dai *dai; 1762 int i; 1763 1764 for_each_rtd_cpu_dais(be, i, dai) { 1765 /* 1766 * Skip CPUs which don't support the current stream 1767 * type. See soc_pcm_init_runtime_hw() for more details 1768 */ 1769 if (!snd_soc_dai_stream_valid(dai, stream)) 1770 continue; 1771 1772 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream); 1773 1774 soc_pcm_hw_update_chan(hw, cpu_stream); 1775 } 1776 1777 /* 1778 * chan min/max cannot be enforced if there are multiple CODEC 1779 * DAIs connected to a single CPU DAI, use CPU DAI's directly 1780 */ 1781 if (be->dai_link->num_codecs == 1) { 1782 struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream( 1783 asoc_rtd_to_codec(be, 0), stream); 1784 1785 soc_pcm_hw_update_chan(hw, codec_stream); 1786 } 1787 } 1788 } 1789 1790 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream) 1791 { 1792 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1793 struct snd_pcm_runtime *runtime = substream->runtime; 1794 struct snd_pcm_hardware *hw = &runtime->hw; 1795 struct snd_soc_dpcm *dpcm; 1796 int stream = substream->stream; 1797 1798 if (!fe->dai_link->dpcm_merged_rate) 1799 return; 1800 1801 /* 1802 * It returns merged BE codec channel; 1803 * if FE want to use it (= dpcm_merged_chan) 1804 */ 1805 1806 for_each_dpcm_be(fe, stream, dpcm) { 1807 struct snd_soc_pcm_runtime *be = dpcm->be; 1808 struct snd_soc_pcm_stream *pcm; 1809 struct snd_soc_dai *dai; 1810 int i; 1811 1812 for_each_rtd_dais(be, i, dai) { 1813 /* 1814 * Skip DAIs which don't support the current stream 1815 * type. See soc_pcm_init_runtime_hw() for more details 1816 */ 1817 if (!snd_soc_dai_stream_valid(dai, stream)) 1818 continue; 1819 1820 pcm = snd_soc_dai_get_pcm_stream(dai, stream); 1821 1822 soc_pcm_hw_update_rate(hw, pcm); 1823 } 1824 } 1825 } 1826 1827 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream, 1828 int stream) 1829 { 1830 struct snd_soc_dpcm *dpcm; 1831 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream); 1832 struct snd_soc_dai *fe_cpu_dai; 1833 int err = 0; 1834 int i; 1835 1836 /* apply symmetry for FE */ 1837 soc_pcm_update_symmetry(fe_substream); 1838 1839 for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) { 1840 /* Symmetry only applies if we've got an active stream. */ 1841 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai); 1842 if (err < 0) 1843 goto error; 1844 } 1845 1846 /* apply symmetry for BE */ 1847 for_each_dpcm_be(fe, stream, dpcm) { 1848 struct snd_soc_pcm_runtime *be = dpcm->be; 1849 struct snd_pcm_substream *be_substream = 1850 snd_soc_dpcm_get_substream(be, stream); 1851 struct snd_soc_pcm_runtime *rtd; 1852 struct snd_soc_dai *dai; 1853 1854 /* A backend may not have the requested substream */ 1855 if (!be_substream) 1856 continue; 1857 1858 rtd = asoc_substream_to_rtd(be_substream); 1859 if (rtd->dai_link->be_hw_params_fixup) 1860 continue; 1861 1862 soc_pcm_update_symmetry(be_substream); 1863 1864 /* Symmetry only applies if we've got an active stream. */ 1865 for_each_rtd_dais(rtd, i, dai) { 1866 err = soc_pcm_apply_symmetry(fe_substream, dai); 1867 if (err < 0) 1868 goto error; 1869 } 1870 } 1871 error: 1872 return soc_pcm_ret(fe, err); 1873 } 1874 1875 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream) 1876 { 1877 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream); 1878 int stream = fe_substream->stream, ret = 0; 1879 1880 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 1881 1882 ret = dpcm_be_dai_startup(fe, stream); 1883 if (ret < 0) 1884 goto be_err; 1885 1886 dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name); 1887 1888 /* start the DAI frontend */ 1889 ret = __soc_pcm_open(fe, fe_substream); 1890 if (ret < 0) 1891 goto unwind; 1892 1893 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN; 1894 1895 dpcm_runtime_setup_fe(fe_substream); 1896 1897 dpcm_runtime_setup_be_format(fe_substream); 1898 dpcm_runtime_setup_be_chan(fe_substream); 1899 dpcm_runtime_setup_be_rate(fe_substream); 1900 1901 ret = dpcm_apply_symmetry(fe_substream, stream); 1902 1903 unwind: 1904 if (ret < 0) 1905 dpcm_be_dai_startup_unwind(fe, stream); 1906 be_err: 1907 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 1908 1909 return soc_pcm_ret(fe, ret); 1910 } 1911 1912 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream) 1913 { 1914 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1915 int stream = substream->stream; 1916 1917 snd_soc_dpcm_mutex_assert_held(fe); 1918 1919 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 1920 1921 /* shutdown the BEs */ 1922 dpcm_be_dai_shutdown(fe, stream); 1923 1924 dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name); 1925 1926 /* now shutdown the frontend */ 1927 __soc_pcm_close(fe, substream); 1928 1929 /* run the stream stop event */ 1930 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP); 1931 1932 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1933 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 1934 return 0; 1935 } 1936 1937 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream) 1938 { 1939 struct snd_soc_dpcm *dpcm; 1940 1941 /* only hw_params backends that are either sinks or sources 1942 * to this frontend DAI */ 1943 for_each_dpcm_be(fe, stream, dpcm) { 1944 1945 struct snd_soc_pcm_runtime *be = dpcm->be; 1946 struct snd_pcm_substream *be_substream = 1947 snd_soc_dpcm_get_substream(be, stream); 1948 1949 /* is this op for this BE ? */ 1950 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1951 continue; 1952 1953 /* only free hw when no longer used - check all FEs */ 1954 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream)) 1955 continue; 1956 1957 /* do not free hw if this BE is used by other FE */ 1958 if (be->dpcm[stream].users > 1) 1959 continue; 1960 1961 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 1962 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) && 1963 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) && 1964 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) && 1965 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) && 1966 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND)) 1967 continue; 1968 1969 dev_dbg(be->dev, "ASoC: hw_free BE %s\n", 1970 be->dai_link->name); 1971 1972 __soc_pcm_hw_free(be, be_substream); 1973 1974 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE; 1975 } 1976 } 1977 1978 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream) 1979 { 1980 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1981 int stream = substream->stream; 1982 1983 snd_soc_dpcm_mutex_lock(fe); 1984 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 1985 1986 dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name); 1987 1988 /* call hw_free on the frontend */ 1989 soc_pcm_hw_clean(fe, substream, 0); 1990 1991 /* only hw_params backends that are either sinks or sources 1992 * to this frontend DAI */ 1993 dpcm_be_dai_hw_free(fe, stream); 1994 1995 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE; 1996 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 1997 1998 snd_soc_dpcm_mutex_unlock(fe); 1999 return 0; 2000 } 2001 2002 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream) 2003 { 2004 struct snd_soc_pcm_runtime *be; 2005 struct snd_pcm_substream *be_substream; 2006 struct snd_soc_dpcm *dpcm; 2007 int ret; 2008 2009 for_each_dpcm_be(fe, stream, dpcm) { 2010 struct snd_pcm_hw_params hw_params; 2011 2012 be = dpcm->be; 2013 be_substream = snd_soc_dpcm_get_substream(be, stream); 2014 2015 /* is this op for this BE ? */ 2016 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2017 continue; 2018 2019 /* copy params for each dpcm */ 2020 memcpy(&hw_params, &fe->dpcm[stream].hw_params, 2021 sizeof(struct snd_pcm_hw_params)); 2022 2023 /* perform any hw_params fixups */ 2024 ret = snd_soc_link_be_hw_params_fixup(be, &hw_params); 2025 if (ret < 0) 2026 goto unwind; 2027 2028 /* copy the fixed-up hw params for BE dai */ 2029 memcpy(&be->dpcm[stream].hw_params, &hw_params, 2030 sizeof(struct snd_pcm_hw_params)); 2031 2032 /* only allow hw_params() if no connected FEs are running */ 2033 if (!snd_soc_dpcm_can_be_params(fe, be, stream)) 2034 continue; 2035 2036 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) && 2037 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 2038 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE)) 2039 continue; 2040 2041 dev_dbg(be->dev, "ASoC: hw_params BE %s\n", 2042 be->dai_link->name); 2043 2044 ret = __soc_pcm_hw_params(be, be_substream, &hw_params); 2045 if (ret < 0) 2046 goto unwind; 2047 2048 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS; 2049 } 2050 return 0; 2051 2052 unwind: 2053 dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n", 2054 __func__, be->dai_link->name, ret); 2055 2056 /* disable any enabled and non active backends */ 2057 for_each_dpcm_be_rollback(fe, stream, dpcm) { 2058 be = dpcm->be; 2059 be_substream = snd_soc_dpcm_get_substream(be, stream); 2060 2061 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2062 continue; 2063 2064 /* only allow hw_free() if no connected FEs are running */ 2065 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream)) 2066 continue; 2067 2068 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) && 2069 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 2070 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) && 2071 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)) 2072 continue; 2073 2074 __soc_pcm_hw_free(be, be_substream); 2075 } 2076 2077 return ret; 2078 } 2079 2080 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream, 2081 struct snd_pcm_hw_params *params) 2082 { 2083 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 2084 int ret, stream = substream->stream; 2085 2086 snd_soc_dpcm_mutex_lock(fe); 2087 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 2088 2089 memcpy(&fe->dpcm[stream].hw_params, params, 2090 sizeof(struct snd_pcm_hw_params)); 2091 ret = dpcm_be_dai_hw_params(fe, stream); 2092 if (ret < 0) 2093 goto out; 2094 2095 dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n", 2096 fe->dai_link->name, params_rate(params), 2097 params_channels(params), params_format(params)); 2098 2099 /* call hw_params on the frontend */ 2100 ret = __soc_pcm_hw_params(fe, substream, params); 2101 if (ret < 0) 2102 dpcm_be_dai_hw_free(fe, stream); 2103 else 2104 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS; 2105 2106 out: 2107 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 2108 snd_soc_dpcm_mutex_unlock(fe); 2109 2110 return soc_pcm_ret(fe, ret); 2111 } 2112 2113 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, 2114 int cmd) 2115 { 2116 struct snd_soc_pcm_runtime *be; 2117 bool pause_stop_transition; 2118 struct snd_soc_dpcm *dpcm; 2119 unsigned long flags; 2120 int ret = 0; 2121 2122 for_each_dpcm_be(fe, stream, dpcm) { 2123 struct snd_pcm_substream *be_substream; 2124 2125 be = dpcm->be; 2126 be_substream = snd_soc_dpcm_get_substream(be, stream); 2127 2128 snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags); 2129 2130 /* is this op for this BE ? */ 2131 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2132 goto next; 2133 2134 dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n", 2135 be->dai_link->name, cmd); 2136 2137 switch (cmd) { 2138 case SNDRV_PCM_TRIGGER_START: 2139 if (!be->dpcm[stream].be_start && 2140 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) && 2141 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) && 2142 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) 2143 goto next; 2144 2145 be->dpcm[stream].be_start++; 2146 if (be->dpcm[stream].be_start != 1) 2147 goto next; 2148 2149 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED) 2150 ret = soc_pcm_trigger(be_substream, 2151 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 2152 else 2153 ret = soc_pcm_trigger(be_substream, 2154 SNDRV_PCM_TRIGGER_START); 2155 if (ret) { 2156 be->dpcm[stream].be_start--; 2157 goto next; 2158 } 2159 2160 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2161 break; 2162 case SNDRV_PCM_TRIGGER_RESUME: 2163 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND)) 2164 goto next; 2165 2166 be->dpcm[stream].be_start++; 2167 if (be->dpcm[stream].be_start != 1) 2168 goto next; 2169 2170 ret = soc_pcm_trigger(be_substream, cmd); 2171 if (ret) { 2172 be->dpcm[stream].be_start--; 2173 goto next; 2174 } 2175 2176 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2177 break; 2178 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2179 if (!be->dpcm[stream].be_start && 2180 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) && 2181 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) 2182 goto next; 2183 2184 fe->dpcm[stream].fe_pause = false; 2185 be->dpcm[stream].be_pause--; 2186 2187 be->dpcm[stream].be_start++; 2188 if (be->dpcm[stream].be_start != 1) 2189 goto next; 2190 2191 ret = soc_pcm_trigger(be_substream, cmd); 2192 if (ret) { 2193 be->dpcm[stream].be_start--; 2194 goto next; 2195 } 2196 2197 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2198 break; 2199 case SNDRV_PCM_TRIGGER_STOP: 2200 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) && 2201 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) 2202 goto next; 2203 2204 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START) 2205 be->dpcm[stream].be_start--; 2206 2207 if (be->dpcm[stream].be_start != 0) 2208 goto next; 2209 2210 pause_stop_transition = false; 2211 if (fe->dpcm[stream].fe_pause) { 2212 pause_stop_transition = true; 2213 fe->dpcm[stream].fe_pause = false; 2214 be->dpcm[stream].be_pause--; 2215 } 2216 2217 if (be->dpcm[stream].be_pause != 0) 2218 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH); 2219 else 2220 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP); 2221 2222 if (ret) { 2223 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START) 2224 be->dpcm[stream].be_start++; 2225 if (pause_stop_transition) { 2226 fe->dpcm[stream].fe_pause = true; 2227 be->dpcm[stream].be_pause++; 2228 } 2229 goto next; 2230 } 2231 2232 if (be->dpcm[stream].be_pause != 0) 2233 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED; 2234 else 2235 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP; 2236 2237 break; 2238 case SNDRV_PCM_TRIGGER_SUSPEND: 2239 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) 2240 goto next; 2241 2242 be->dpcm[stream].be_start--; 2243 if (be->dpcm[stream].be_start != 0) 2244 goto next; 2245 2246 ret = soc_pcm_trigger(be_substream, cmd); 2247 if (ret) { 2248 be->dpcm[stream].be_start++; 2249 goto next; 2250 } 2251 2252 be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND; 2253 break; 2254 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2255 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) 2256 goto next; 2257 2258 fe->dpcm[stream].fe_pause = true; 2259 be->dpcm[stream].be_pause++; 2260 2261 be->dpcm[stream].be_start--; 2262 if (be->dpcm[stream].be_start != 0) 2263 goto next; 2264 2265 ret = soc_pcm_trigger(be_substream, cmd); 2266 if (ret) { 2267 be->dpcm[stream].be_start++; 2268 goto next; 2269 } 2270 2271 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED; 2272 break; 2273 } 2274 next: 2275 snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags); 2276 if (ret) 2277 break; 2278 } 2279 return soc_pcm_ret(fe, ret); 2280 } 2281 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger); 2282 2283 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream, 2284 int cmd, bool fe_first) 2285 { 2286 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 2287 int ret; 2288 2289 /* call trigger on the frontend before the backend. */ 2290 if (fe_first) { 2291 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n", 2292 fe->dai_link->name, cmd); 2293 2294 ret = soc_pcm_trigger(substream, cmd); 2295 if (ret < 0) 2296 return ret; 2297 2298 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd); 2299 return ret; 2300 } 2301 2302 /* call trigger on the frontend after the backend. */ 2303 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd); 2304 if (ret < 0) 2305 return ret; 2306 2307 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n", 2308 fe->dai_link->name, cmd); 2309 2310 ret = soc_pcm_trigger(substream, cmd); 2311 2312 return ret; 2313 } 2314 2315 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd) 2316 { 2317 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 2318 int stream = substream->stream; 2319 int ret = 0; 2320 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream]; 2321 2322 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE; 2323 2324 switch (trigger) { 2325 case SND_SOC_DPCM_TRIGGER_PRE: 2326 switch (cmd) { 2327 case SNDRV_PCM_TRIGGER_START: 2328 case SNDRV_PCM_TRIGGER_RESUME: 2329 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2330 case SNDRV_PCM_TRIGGER_DRAIN: 2331 ret = dpcm_dai_trigger_fe_be(substream, cmd, true); 2332 break; 2333 case SNDRV_PCM_TRIGGER_STOP: 2334 case SNDRV_PCM_TRIGGER_SUSPEND: 2335 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2336 ret = dpcm_dai_trigger_fe_be(substream, cmd, false); 2337 break; 2338 default: 2339 ret = -EINVAL; 2340 break; 2341 } 2342 break; 2343 case SND_SOC_DPCM_TRIGGER_POST: 2344 switch (cmd) { 2345 case SNDRV_PCM_TRIGGER_START: 2346 case SNDRV_PCM_TRIGGER_RESUME: 2347 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2348 case SNDRV_PCM_TRIGGER_DRAIN: 2349 ret = dpcm_dai_trigger_fe_be(substream, cmd, false); 2350 break; 2351 case SNDRV_PCM_TRIGGER_STOP: 2352 case SNDRV_PCM_TRIGGER_SUSPEND: 2353 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2354 ret = dpcm_dai_trigger_fe_be(substream, cmd, true); 2355 break; 2356 default: 2357 ret = -EINVAL; 2358 break; 2359 } 2360 break; 2361 case SND_SOC_DPCM_TRIGGER_BESPOKE: 2362 /* bespoke trigger() - handles both FE and BEs */ 2363 2364 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n", 2365 fe->dai_link->name, cmd); 2366 2367 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd); 2368 break; 2369 default: 2370 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd, 2371 fe->dai_link->name); 2372 ret = -EINVAL; 2373 goto out; 2374 } 2375 2376 if (ret < 0) { 2377 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n", 2378 cmd, ret); 2379 goto out; 2380 } 2381 2382 switch (cmd) { 2383 case SNDRV_PCM_TRIGGER_START: 2384 case SNDRV_PCM_TRIGGER_RESUME: 2385 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2386 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2387 break; 2388 case SNDRV_PCM_TRIGGER_STOP: 2389 case SNDRV_PCM_TRIGGER_SUSPEND: 2390 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP; 2391 break; 2392 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2393 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED; 2394 break; 2395 } 2396 2397 out: 2398 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO; 2399 return ret; 2400 } 2401 2402 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd) 2403 { 2404 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 2405 int stream = substream->stream; 2406 2407 /* if FE's runtime_update is already set, we're in race; 2408 * process this trigger later at exit 2409 */ 2410 if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) { 2411 fe->dpcm[stream].trigger_pending = cmd + 1; 2412 return 0; /* delayed, assuming it's successful */ 2413 } 2414 2415 /* we're alone, let's trigger */ 2416 return dpcm_fe_dai_do_trigger(substream, cmd); 2417 } 2418 2419 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream) 2420 { 2421 struct snd_soc_dpcm *dpcm; 2422 int ret = 0; 2423 2424 for_each_dpcm_be(fe, stream, dpcm) { 2425 2426 struct snd_soc_pcm_runtime *be = dpcm->be; 2427 struct snd_pcm_substream *be_substream = 2428 snd_soc_dpcm_get_substream(be, stream); 2429 2430 /* is this op for this BE ? */ 2431 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2432 continue; 2433 2434 if (!snd_soc_dpcm_can_be_prepared(fe, be, stream)) 2435 continue; 2436 2437 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 2438 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) && 2439 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) && 2440 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) 2441 continue; 2442 2443 dev_dbg(be->dev, "ASoC: prepare BE %s\n", 2444 be->dai_link->name); 2445 2446 ret = __soc_pcm_prepare(be, be_substream); 2447 if (ret < 0) 2448 break; 2449 2450 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE; 2451 } 2452 2453 return soc_pcm_ret(fe, ret); 2454 } 2455 2456 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream) 2457 { 2458 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 2459 int stream = substream->stream, ret = 0; 2460 2461 snd_soc_dpcm_mutex_lock(fe); 2462 2463 dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name); 2464 2465 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 2466 2467 /* there is no point preparing this FE if there are no BEs */ 2468 if (list_empty(&fe->dpcm[stream].be_clients)) { 2469 /* dev_err_once() for visibility, dev_dbg() for debugging UCM profiles */ 2470 dev_err_once(fe->dev, "ASoC: no backend DAIs enabled for %s, possibly missing ALSA mixer-based routing or UCM profile\n", 2471 fe->dai_link->name); 2472 dev_dbg(fe->dev, "ASoC: no backend DAIs enabled for %s\n", 2473 fe->dai_link->name); 2474 ret = -EINVAL; 2475 goto out; 2476 } 2477 2478 ret = dpcm_be_dai_prepare(fe, stream); 2479 if (ret < 0) 2480 goto out; 2481 2482 /* call prepare on the frontend */ 2483 ret = __soc_pcm_prepare(fe, substream); 2484 if (ret < 0) 2485 goto out; 2486 2487 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE; 2488 2489 out: 2490 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 2491 snd_soc_dpcm_mutex_unlock(fe); 2492 2493 return soc_pcm_ret(fe, ret); 2494 } 2495 2496 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream) 2497 { 2498 struct snd_pcm_substream *substream = 2499 snd_soc_dpcm_get_substream(fe, stream); 2500 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream]; 2501 int err; 2502 2503 dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n", 2504 stream ? "capture" : "playback", fe->dai_link->name); 2505 2506 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) { 2507 /* call bespoke trigger - FE takes care of all BE triggers */ 2508 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n", 2509 fe->dai_link->name); 2510 2511 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP); 2512 } else { 2513 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n", 2514 fe->dai_link->name); 2515 2516 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP); 2517 } 2518 2519 dpcm_be_dai_hw_free(fe, stream); 2520 2521 dpcm_be_dai_shutdown(fe, stream); 2522 2523 /* run the stream event for each BE */ 2524 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP); 2525 2526 return soc_pcm_ret(fe, err); 2527 } 2528 2529 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream) 2530 { 2531 struct snd_pcm_substream *substream = 2532 snd_soc_dpcm_get_substream(fe, stream); 2533 struct snd_soc_dpcm *dpcm; 2534 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream]; 2535 int ret = 0; 2536 2537 dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n", 2538 stream ? "capture" : "playback", fe->dai_link->name); 2539 2540 /* Only start the BE if the FE is ready */ 2541 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE || 2542 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) { 2543 dev_err(fe->dev, "ASoC: FE %s is not ready %d\n", 2544 fe->dai_link->name, fe->dpcm[stream].state); 2545 ret = -EINVAL; 2546 goto disconnect; 2547 } 2548 2549 /* startup must always be called for new BEs */ 2550 ret = dpcm_be_dai_startup(fe, stream); 2551 if (ret < 0) 2552 goto disconnect; 2553 2554 /* keep going if FE state is > open */ 2555 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN) 2556 return 0; 2557 2558 ret = dpcm_be_dai_hw_params(fe, stream); 2559 if (ret < 0) 2560 goto close; 2561 2562 /* keep going if FE state is > hw_params */ 2563 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS) 2564 return 0; 2565 2566 ret = dpcm_be_dai_prepare(fe, stream); 2567 if (ret < 0) 2568 goto hw_free; 2569 2570 /* run the stream event for each BE */ 2571 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP); 2572 2573 /* keep going if FE state is > prepare */ 2574 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE || 2575 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP) 2576 return 0; 2577 2578 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) { 2579 /* call trigger on the frontend - FE takes care of all BE triggers */ 2580 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n", 2581 fe->dai_link->name); 2582 2583 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START); 2584 if (ret < 0) 2585 goto hw_free; 2586 } else { 2587 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n", 2588 fe->dai_link->name); 2589 2590 ret = dpcm_be_dai_trigger(fe, stream, 2591 SNDRV_PCM_TRIGGER_START); 2592 if (ret < 0) 2593 goto hw_free; 2594 } 2595 2596 return 0; 2597 2598 hw_free: 2599 dpcm_be_dai_hw_free(fe, stream); 2600 close: 2601 dpcm_be_dai_shutdown(fe, stream); 2602 disconnect: 2603 /* disconnect any pending BEs */ 2604 for_each_dpcm_be(fe, stream, dpcm) { 2605 struct snd_soc_pcm_runtime *be = dpcm->be; 2606 2607 /* is this op for this BE ? */ 2608 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2609 continue; 2610 2611 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE || 2612 be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW) 2613 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE; 2614 } 2615 2616 return soc_pcm_ret(fe, ret); 2617 } 2618 2619 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new) 2620 { 2621 struct snd_soc_dapm_widget_list *list; 2622 int stream; 2623 int count, paths; 2624 2625 if (!fe->dai_link->dynamic) 2626 return 0; 2627 2628 if (fe->dai_link->num_cpus > 1) { 2629 dev_err(fe->dev, 2630 "%s doesn't support Multi CPU yet\n", __func__); 2631 return -EINVAL; 2632 } 2633 2634 /* only check active links */ 2635 if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0))) 2636 return 0; 2637 2638 /* DAPM sync will call this to update DSP paths */ 2639 dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n", 2640 new ? "new" : "old", fe->dai_link->name); 2641 2642 for_each_pcm_streams(stream) { 2643 2644 /* skip if FE doesn't have playback/capture capability */ 2645 if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream) || 2646 !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream)) 2647 continue; 2648 2649 /* skip if FE isn't currently playing/capturing */ 2650 if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) || 2651 !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream)) 2652 continue; 2653 2654 paths = dpcm_path_get(fe, stream, &list); 2655 if (paths < 0) 2656 return paths; 2657 2658 /* update any playback/capture paths */ 2659 count = dpcm_process_paths(fe, stream, &list, new); 2660 if (count) { 2661 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE); 2662 if (new) 2663 dpcm_run_update_startup(fe, stream); 2664 else 2665 dpcm_run_update_shutdown(fe, stream); 2666 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 2667 2668 dpcm_clear_pending_state(fe, stream); 2669 dpcm_be_disconnect(fe, stream); 2670 } 2671 2672 dpcm_path_put(&list); 2673 } 2674 2675 return 0; 2676 } 2677 2678 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and 2679 * any DAI links. 2680 */ 2681 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card) 2682 { 2683 struct snd_soc_pcm_runtime *fe; 2684 int ret = 0; 2685 2686 snd_soc_dpcm_mutex_lock(card); 2687 /* shutdown all old paths first */ 2688 for_each_card_rtds(card, fe) { 2689 ret = soc_dpcm_fe_runtime_update(fe, 0); 2690 if (ret) 2691 goto out; 2692 } 2693 2694 /* bring new paths up */ 2695 for_each_card_rtds(card, fe) { 2696 ret = soc_dpcm_fe_runtime_update(fe, 1); 2697 if (ret) 2698 goto out; 2699 } 2700 2701 out: 2702 snd_soc_dpcm_mutex_unlock(card); 2703 return ret; 2704 } 2705 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update); 2706 2707 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream) 2708 { 2709 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream); 2710 struct snd_soc_dpcm *dpcm; 2711 int stream = fe_substream->stream; 2712 2713 snd_soc_dpcm_mutex_assert_held(fe); 2714 2715 /* mark FE's links ready to prune */ 2716 for_each_dpcm_be(fe, stream, dpcm) 2717 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE; 2718 2719 dpcm_be_disconnect(fe, stream); 2720 } 2721 2722 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream) 2723 { 2724 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream); 2725 int ret; 2726 2727 snd_soc_dpcm_mutex_lock(fe); 2728 ret = dpcm_fe_dai_shutdown(fe_substream); 2729 2730 dpcm_fe_dai_cleanup(fe_substream); 2731 2732 snd_soc_dpcm_mutex_unlock(fe); 2733 return ret; 2734 } 2735 2736 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream) 2737 { 2738 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream); 2739 struct snd_soc_dapm_widget_list *list; 2740 int ret; 2741 int stream = fe_substream->stream; 2742 2743 snd_soc_dpcm_mutex_lock(fe); 2744 2745 ret = dpcm_path_get(fe, stream, &list); 2746 if (ret < 0) 2747 goto open_end; 2748 2749 /* calculate valid and active FE <-> BE dpcms */ 2750 dpcm_process_paths(fe, stream, &list, 1); 2751 2752 ret = dpcm_fe_dai_startup(fe_substream); 2753 if (ret < 0) 2754 dpcm_fe_dai_cleanup(fe_substream); 2755 2756 dpcm_clear_pending_state(fe, stream); 2757 dpcm_path_put(&list); 2758 open_end: 2759 snd_soc_dpcm_mutex_unlock(fe); 2760 return ret; 2761 } 2762 2763 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd, 2764 int *playback, int *capture) 2765 { 2766 struct snd_soc_dai_link *dai_link = rtd->dai_link; 2767 struct snd_soc_dai *cpu_dai; 2768 int has_playback = 0; 2769 int has_capture = 0; 2770 int i; 2771 2772 if (dai_link->dynamic && dai_link->num_cpus > 1) { 2773 dev_err(rtd->dev, "DPCM doesn't support Multi CPU for Front-Ends yet\n"); 2774 return -EINVAL; 2775 } 2776 2777 if (dai_link->dynamic || dai_link->no_pcm) { 2778 int stream; 2779 2780 if (dai_link->dpcm_playback) { 2781 stream = SNDRV_PCM_STREAM_PLAYBACK; 2782 2783 for_each_rtd_cpu_dais(rtd, i, cpu_dai) { 2784 if (snd_soc_dai_stream_valid(cpu_dai, stream)) { 2785 has_playback = 1; 2786 break; 2787 } 2788 } 2789 if (!has_playback) { 2790 dev_err(rtd->card->dev, 2791 "No CPU DAIs support playback for stream %s\n", 2792 dai_link->stream_name); 2793 return -EINVAL; 2794 } 2795 } 2796 if (dai_link->dpcm_capture) { 2797 stream = SNDRV_PCM_STREAM_CAPTURE; 2798 2799 for_each_rtd_cpu_dais(rtd, i, cpu_dai) { 2800 if (snd_soc_dai_stream_valid(cpu_dai, stream)) { 2801 has_capture = 1; 2802 break; 2803 } 2804 } 2805 2806 if (!has_capture) { 2807 dev_err(rtd->card->dev, 2808 "No CPU DAIs support capture for stream %s\n", 2809 dai_link->stream_name); 2810 return -EINVAL; 2811 } 2812 } 2813 } else { 2814 struct snd_soc_dai *codec_dai; 2815 2816 /* Adapt stream for codec2codec links */ 2817 int cpu_capture = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_CAPTURE); 2818 int cpu_playback = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_PLAYBACK); 2819 2820 for_each_rtd_codec_dais(rtd, i, codec_dai) { 2821 if (dai_link->num_cpus == 1) { 2822 cpu_dai = asoc_rtd_to_cpu(rtd, 0); 2823 } else if (dai_link->num_cpus == dai_link->num_codecs) { 2824 cpu_dai = asoc_rtd_to_cpu(rtd, i); 2825 } else if (rtd->dai_link->num_codecs > rtd->dai_link->num_cpus) { 2826 int cpu_id; 2827 2828 if (!rtd->dai_link->codec_ch_maps) { 2829 dev_err(rtd->card->dev, "%s: no codec channel mapping table provided\n", 2830 __func__); 2831 return -EINVAL; 2832 } 2833 2834 cpu_id = rtd->dai_link->codec_ch_maps[i].connected_cpu_id; 2835 cpu_dai = asoc_rtd_to_cpu(rtd, cpu_id); 2836 } else { 2837 dev_err(rtd->card->dev, 2838 "%s codec number %d < cpu number %d is not supported\n", 2839 __func__, rtd->dai_link->num_codecs, 2840 rtd->dai_link->num_cpus); 2841 return -EINVAL; 2842 } 2843 2844 if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) && 2845 snd_soc_dai_stream_valid(cpu_dai, cpu_playback)) 2846 has_playback = 1; 2847 if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) && 2848 snd_soc_dai_stream_valid(cpu_dai, cpu_capture)) 2849 has_capture = 1; 2850 } 2851 } 2852 2853 if (dai_link->playback_only) 2854 has_capture = 0; 2855 2856 if (dai_link->capture_only) 2857 has_playback = 0; 2858 2859 if (!has_playback && !has_capture) { 2860 dev_err(rtd->dev, "substream %s has no playback, no capture\n", 2861 dai_link->stream_name); 2862 2863 return -EINVAL; 2864 } 2865 2866 *playback = has_playback; 2867 *capture = has_capture; 2868 2869 return 0; 2870 } 2871 2872 static int soc_create_pcm(struct snd_pcm **pcm, 2873 struct snd_soc_pcm_runtime *rtd, 2874 int playback, int capture, int num) 2875 { 2876 char new_name[64]; 2877 int ret; 2878 2879 /* create the PCM */ 2880 if (rtd->dai_link->c2c_params) { 2881 snprintf(new_name, sizeof(new_name), "codec2codec(%s)", 2882 rtd->dai_link->stream_name); 2883 2884 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num, 2885 playback, capture, pcm); 2886 } else if (rtd->dai_link->no_pcm) { 2887 snprintf(new_name, sizeof(new_name), "(%s)", 2888 rtd->dai_link->stream_name); 2889 2890 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num, 2891 playback, capture, pcm); 2892 } else { 2893 if (rtd->dai_link->dynamic) 2894 snprintf(new_name, sizeof(new_name), "%s (*)", 2895 rtd->dai_link->stream_name); 2896 else 2897 snprintf(new_name, sizeof(new_name), "%s %s-%d", 2898 rtd->dai_link->stream_name, 2899 soc_codec_dai_name(rtd), num); 2900 2901 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback, 2902 capture, pcm); 2903 } 2904 if (ret < 0) { 2905 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n", 2906 new_name, rtd->dai_link->name, ret); 2907 return ret; 2908 } 2909 dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name); 2910 2911 return 0; 2912 } 2913 2914 /* create a new pcm */ 2915 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num) 2916 { 2917 struct snd_soc_component *component; 2918 struct snd_pcm *pcm; 2919 int ret = 0, playback = 0, capture = 0; 2920 int i; 2921 2922 ret = soc_get_playback_capture(rtd, &playback, &capture); 2923 if (ret < 0) 2924 return ret; 2925 2926 ret = soc_create_pcm(&pcm, rtd, playback, capture, num); 2927 if (ret < 0) 2928 return ret; 2929 2930 /* DAPM dai link stream work */ 2931 /* 2932 * Currently nothing to do for c2c links 2933 * Since c2c links are internal nodes in the DAPM graph and 2934 * don't interface with the outside world or application layer 2935 * we don't have to do any special handling on close. 2936 */ 2937 if (!rtd->dai_link->c2c_params) 2938 rtd->close_delayed_work_func = snd_soc_close_delayed_work; 2939 2940 rtd->pcm = pcm; 2941 pcm->nonatomic = rtd->dai_link->nonatomic; 2942 pcm->private_data = rtd; 2943 pcm->no_device_suspend = true; 2944 2945 if (rtd->dai_link->no_pcm || rtd->dai_link->c2c_params) { 2946 if (playback) 2947 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd; 2948 if (capture) 2949 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd; 2950 goto out; 2951 } 2952 2953 /* ASoC PCM operations */ 2954 if (rtd->dai_link->dynamic) { 2955 rtd->ops.open = dpcm_fe_dai_open; 2956 rtd->ops.hw_params = dpcm_fe_dai_hw_params; 2957 rtd->ops.prepare = dpcm_fe_dai_prepare; 2958 rtd->ops.trigger = dpcm_fe_dai_trigger; 2959 rtd->ops.hw_free = dpcm_fe_dai_hw_free; 2960 rtd->ops.close = dpcm_fe_dai_close; 2961 rtd->ops.pointer = soc_pcm_pointer; 2962 } else { 2963 rtd->ops.open = soc_pcm_open; 2964 rtd->ops.hw_params = soc_pcm_hw_params; 2965 rtd->ops.prepare = soc_pcm_prepare; 2966 rtd->ops.trigger = soc_pcm_trigger; 2967 rtd->ops.hw_free = soc_pcm_hw_free; 2968 rtd->ops.close = soc_pcm_close; 2969 rtd->ops.pointer = soc_pcm_pointer; 2970 } 2971 2972 for_each_rtd_components(rtd, i, component) { 2973 const struct snd_soc_component_driver *drv = component->driver; 2974 2975 if (drv->ioctl) 2976 rtd->ops.ioctl = snd_soc_pcm_component_ioctl; 2977 if (drv->sync_stop) 2978 rtd->ops.sync_stop = snd_soc_pcm_component_sync_stop; 2979 if (drv->copy) 2980 rtd->ops.copy = snd_soc_pcm_component_copy; 2981 if (drv->page) 2982 rtd->ops.page = snd_soc_pcm_component_page; 2983 if (drv->mmap) 2984 rtd->ops.mmap = snd_soc_pcm_component_mmap; 2985 if (drv->ack) 2986 rtd->ops.ack = snd_soc_pcm_component_ack; 2987 } 2988 2989 if (playback) 2990 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops); 2991 2992 if (capture) 2993 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops); 2994 2995 ret = snd_soc_pcm_component_new(rtd); 2996 if (ret < 0) 2997 return ret; 2998 out: 2999 dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n", 3000 soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd)); 3001 return ret; 3002 } 3003 3004 /* is the current PCM operation for this FE ? */ 3005 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream) 3006 { 3007 if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) 3008 return 1; 3009 return 0; 3010 } 3011 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update); 3012 3013 /* is the current PCM operation for this BE ? */ 3014 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe, 3015 struct snd_soc_pcm_runtime *be, int stream) 3016 { 3017 if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) || 3018 ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) && 3019 be->dpcm[stream].runtime_update)) 3020 return 1; 3021 return 0; 3022 } 3023 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update); 3024 3025 /* get the substream for this BE */ 3026 struct snd_pcm_substream * 3027 snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream) 3028 { 3029 return be->pcm->streams[stream].substream; 3030 } 3031 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream); 3032 3033 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe, 3034 struct snd_soc_pcm_runtime *be, 3035 int stream, 3036 const enum snd_soc_dpcm_state *states, 3037 int num_states) 3038 { 3039 struct snd_soc_dpcm *dpcm; 3040 int state; 3041 int ret = 1; 3042 int i; 3043 3044 for_each_dpcm_fe(be, stream, dpcm) { 3045 3046 if (dpcm->fe == fe) 3047 continue; 3048 3049 state = dpcm->fe->dpcm[stream].state; 3050 for (i = 0; i < num_states; i++) { 3051 if (state == states[i]) { 3052 ret = 0; 3053 break; 3054 } 3055 } 3056 } 3057 3058 /* it's safe to do this BE DAI */ 3059 return ret; 3060 } 3061 3062 /* 3063 * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE 3064 * are not running, paused or suspended for the specified stream direction. 3065 */ 3066 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe, 3067 struct snd_soc_pcm_runtime *be, int stream) 3068 { 3069 const enum snd_soc_dpcm_state state[] = { 3070 SND_SOC_DPCM_STATE_START, 3071 SND_SOC_DPCM_STATE_PAUSED, 3072 SND_SOC_DPCM_STATE_SUSPEND, 3073 }; 3074 3075 return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state)); 3076 } 3077 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop); 3078 3079 /* 3080 * We can only change hw params a BE DAI if any of it's FE are not prepared, 3081 * running, paused or suspended for the specified stream direction. 3082 */ 3083 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe, 3084 struct snd_soc_pcm_runtime *be, int stream) 3085 { 3086 const enum snd_soc_dpcm_state state[] = { 3087 SND_SOC_DPCM_STATE_START, 3088 SND_SOC_DPCM_STATE_PAUSED, 3089 SND_SOC_DPCM_STATE_SUSPEND, 3090 SND_SOC_DPCM_STATE_PREPARE, 3091 }; 3092 3093 return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state)); 3094 } 3095 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params); 3096 3097 /* 3098 * We can only prepare a BE DAI if any of it's FE are not prepared, 3099 * running or paused for the specified stream direction. 3100 */ 3101 int snd_soc_dpcm_can_be_prepared(struct snd_soc_pcm_runtime *fe, 3102 struct snd_soc_pcm_runtime *be, int stream) 3103 { 3104 const enum snd_soc_dpcm_state state[] = { 3105 SND_SOC_DPCM_STATE_START, 3106 SND_SOC_DPCM_STATE_PAUSED, 3107 SND_SOC_DPCM_STATE_PREPARE, 3108 }; 3109 3110 return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state)); 3111 } 3112 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_prepared); 3113