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 int i, ret = 0; 989 990 snd_soc_dpcm_mutex_assert_held(rtd); 991 992 ret = soc_pcm_params_symmetry(substream, params); 993 if (ret) 994 goto out; 995 996 ret = snd_soc_link_hw_params(substream, params); 997 if (ret < 0) 998 goto out; 999 1000 for_each_rtd_codec_dais(rtd, i, codec_dai) { 1001 struct snd_pcm_hw_params codec_params; 1002 unsigned int tdm_mask = snd_soc_dai_tdm_mask_get(codec_dai, substream->stream); 1003 1004 /* 1005 * Skip CODECs which don't support the current stream type, 1006 * the idea being that if a CODEC is not used for the currently 1007 * set up transfer direction, it should not need to be 1008 * configured, especially since the configuration used might 1009 * not even be supported by that CODEC. There may be cases 1010 * however where a CODEC needs to be set up although it is 1011 * actually not being used for the transfer, e.g. if a 1012 * capture-only CODEC is acting as an LRCLK and/or BCLK master 1013 * for the DAI link including a playback-only CODEC. 1014 * If this becomes necessary, we will have to augment the 1015 * machine driver setup with information on how to act, so 1016 * we can do the right thing here. 1017 */ 1018 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream)) 1019 continue; 1020 1021 /* copy params for each codec */ 1022 codec_params = *params; 1023 1024 /* fixup params based on TDM slot masks */ 1025 if (tdm_mask) 1026 soc_pcm_codec_params_fixup(&codec_params, tdm_mask); 1027 1028 ret = snd_soc_dai_hw_params(codec_dai, substream, 1029 &codec_params); 1030 if(ret < 0) 1031 goto out; 1032 1033 soc_pcm_set_dai_params(codec_dai, &codec_params); 1034 snd_soc_dapm_update_dai(substream, &codec_params, codec_dai); 1035 } 1036 1037 for_each_rtd_cpu_dais(rtd, i, cpu_dai) { 1038 struct snd_pcm_hw_params cpu_params; 1039 unsigned int ch_mask = 0; 1040 int j; 1041 1042 /* 1043 * Skip CPUs which don't support the current stream 1044 * type. See soc_pcm_init_runtime_hw() for more details 1045 */ 1046 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream)) 1047 continue; 1048 1049 /* copy params for each cpu */ 1050 cpu_params = *params; 1051 1052 if (!rtd->dai_link->codec_ch_maps) 1053 goto hw_params; 1054 /* 1055 * construct cpu channel mask by combining ch_mask of each 1056 * codec which maps to the cpu. 1057 */ 1058 for_each_rtd_codec_dais(rtd, j, codec_dai) { 1059 if (rtd->dai_link->codec_ch_maps[j].connected_cpu_id == i) 1060 ch_mask |= rtd->dai_link->codec_ch_maps[j].ch_mask; 1061 } 1062 1063 /* fixup cpu channel number */ 1064 if (ch_mask) 1065 soc_pcm_codec_params_fixup(&cpu_params, ch_mask); 1066 1067 hw_params: 1068 ret = snd_soc_dai_hw_params(cpu_dai, substream, &cpu_params); 1069 if (ret < 0) 1070 goto out; 1071 1072 /* store the parameters for each DAI */ 1073 soc_pcm_set_dai_params(cpu_dai, &cpu_params); 1074 snd_soc_dapm_update_dai(substream, &cpu_params, cpu_dai); 1075 } 1076 1077 ret = snd_soc_pcm_component_hw_params(substream, params); 1078 out: 1079 if (ret < 0) 1080 soc_pcm_hw_clean(rtd, substream, 1); 1081 1082 return soc_pcm_ret(rtd, ret); 1083 } 1084 1085 /* hw_params PCM ops for non-DPCM streams */ 1086 static int soc_pcm_hw_params(struct snd_pcm_substream *substream, 1087 struct snd_pcm_hw_params *params) 1088 { 1089 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 1090 int ret; 1091 1092 snd_soc_dpcm_mutex_lock(rtd); 1093 ret = __soc_pcm_hw_params(rtd, substream, params); 1094 snd_soc_dpcm_mutex_unlock(rtd); 1095 return ret; 1096 } 1097 1098 #define TRIGGER_MAX 3 1099 static int (* const trigger[][TRIGGER_MAX])(struct snd_pcm_substream *substream, int cmd, int rollback) = { 1100 [SND_SOC_TRIGGER_ORDER_DEFAULT] = { 1101 snd_soc_link_trigger, 1102 snd_soc_pcm_component_trigger, 1103 snd_soc_pcm_dai_trigger, 1104 }, 1105 [SND_SOC_TRIGGER_ORDER_LDC] = { 1106 snd_soc_link_trigger, 1107 snd_soc_pcm_dai_trigger, 1108 snd_soc_pcm_component_trigger, 1109 }, 1110 }; 1111 1112 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 1113 { 1114 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 1115 struct snd_soc_component *component; 1116 int ret = 0, r = 0, i; 1117 int rollback = 0; 1118 int start = 0, stop = 0; 1119 1120 /* 1121 * select START/STOP sequence 1122 */ 1123 for_each_rtd_components(rtd, i, component) { 1124 if (component->driver->trigger_start) 1125 start = component->driver->trigger_start; 1126 if (component->driver->trigger_stop) 1127 stop = component->driver->trigger_stop; 1128 } 1129 if (rtd->dai_link->trigger_start) 1130 start = rtd->dai_link->trigger_start; 1131 if (rtd->dai_link->trigger_stop) 1132 stop = rtd->dai_link->trigger_stop; 1133 1134 if (start < 0 || start >= SND_SOC_TRIGGER_ORDER_MAX || 1135 stop < 0 || stop >= SND_SOC_TRIGGER_ORDER_MAX) 1136 return -EINVAL; 1137 1138 /* 1139 * START 1140 */ 1141 switch (cmd) { 1142 case SNDRV_PCM_TRIGGER_START: 1143 case SNDRV_PCM_TRIGGER_RESUME: 1144 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1145 for (i = 0; i < TRIGGER_MAX; i++) { 1146 r = trigger[start][i](substream, cmd, 0); 1147 if (r < 0) 1148 break; 1149 } 1150 } 1151 1152 /* 1153 * Rollback if START failed 1154 * find correspond STOP command 1155 */ 1156 if (r < 0) { 1157 rollback = 1; 1158 ret = r; 1159 switch (cmd) { 1160 case SNDRV_PCM_TRIGGER_START: 1161 cmd = SNDRV_PCM_TRIGGER_STOP; 1162 break; 1163 case SNDRV_PCM_TRIGGER_RESUME: 1164 cmd = SNDRV_PCM_TRIGGER_SUSPEND; 1165 break; 1166 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1167 cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH; 1168 break; 1169 } 1170 } 1171 1172 /* 1173 * STOP 1174 */ 1175 switch (cmd) { 1176 case SNDRV_PCM_TRIGGER_STOP: 1177 case SNDRV_PCM_TRIGGER_SUSPEND: 1178 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1179 for (i = TRIGGER_MAX; i > 0; i--) { 1180 r = trigger[stop][i - 1](substream, cmd, rollback); 1181 if (r < 0) 1182 ret = r; 1183 } 1184 } 1185 1186 return ret; 1187 } 1188 1189 /* 1190 * soc level wrapper for pointer callback 1191 * If cpu_dai, codec_dai, component driver has the delay callback, then 1192 * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay(). 1193 */ 1194 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream) 1195 { 1196 struct snd_pcm_runtime *runtime = substream->runtime; 1197 snd_pcm_uframes_t offset = 0; 1198 snd_pcm_sframes_t codec_delay = 0; 1199 snd_pcm_sframes_t cpu_delay = 0; 1200 1201 offset = snd_soc_pcm_component_pointer(substream); 1202 1203 /* should be called *after* snd_soc_pcm_component_pointer() */ 1204 snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay); 1205 snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay); 1206 1207 runtime->delay = cpu_delay + codec_delay; 1208 1209 return offset; 1210 } 1211 1212 /* connect a FE and BE */ 1213 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe, 1214 struct snd_soc_pcm_runtime *be, int stream) 1215 { 1216 struct snd_pcm_substream *fe_substream; 1217 struct snd_pcm_substream *be_substream; 1218 struct snd_soc_dpcm *dpcm; 1219 1220 snd_soc_dpcm_mutex_assert_held(fe); 1221 1222 /* only add new dpcms */ 1223 for_each_dpcm_be(fe, stream, dpcm) { 1224 if (dpcm->be == be && dpcm->fe == fe) 1225 return 0; 1226 } 1227 1228 fe_substream = snd_soc_dpcm_get_substream(fe, stream); 1229 be_substream = snd_soc_dpcm_get_substream(be, stream); 1230 1231 if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) { 1232 dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n", 1233 __func__); 1234 return -EINVAL; 1235 } 1236 if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) { 1237 dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n"); 1238 be_substream->pcm->nonatomic = 1; 1239 } 1240 1241 dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL); 1242 if (!dpcm) 1243 return -ENOMEM; 1244 1245 dpcm->be = be; 1246 dpcm->fe = fe; 1247 dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW; 1248 snd_soc_dpcm_stream_lock_irq(fe, stream); 1249 list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients); 1250 list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients); 1251 snd_soc_dpcm_stream_unlock_irq(fe, stream); 1252 1253 dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n", 1254 stream ? "capture" : "playback", fe->dai_link->name, 1255 stream ? "<-" : "->", be->dai_link->name); 1256 1257 dpcm_create_debugfs_state(dpcm, stream); 1258 1259 return 1; 1260 } 1261 1262 /* reparent a BE onto another FE */ 1263 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe, 1264 struct snd_soc_pcm_runtime *be, int stream) 1265 { 1266 struct snd_soc_dpcm *dpcm; 1267 struct snd_pcm_substream *fe_substream, *be_substream; 1268 1269 /* reparent if BE is connected to other FEs */ 1270 if (!be->dpcm[stream].users) 1271 return; 1272 1273 be_substream = snd_soc_dpcm_get_substream(be, stream); 1274 if (!be_substream) 1275 return; 1276 1277 for_each_dpcm_fe(be, stream, dpcm) { 1278 if (dpcm->fe == fe) 1279 continue; 1280 1281 dev_dbg(fe->dev, "reparent %s path %s %s %s\n", 1282 stream ? "capture" : "playback", 1283 dpcm->fe->dai_link->name, 1284 stream ? "<-" : "->", dpcm->be->dai_link->name); 1285 1286 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream); 1287 be_substream->runtime = fe_substream->runtime; 1288 break; 1289 } 1290 } 1291 1292 /* disconnect a BE and FE */ 1293 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream) 1294 { 1295 struct snd_soc_dpcm *dpcm, *d; 1296 LIST_HEAD(deleted_dpcms); 1297 1298 snd_soc_dpcm_mutex_assert_held(fe); 1299 1300 snd_soc_dpcm_stream_lock_irq(fe, stream); 1301 for_each_dpcm_be_safe(fe, stream, dpcm, d) { 1302 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n", 1303 stream ? "capture" : "playback", 1304 dpcm->be->dai_link->name); 1305 1306 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE) 1307 continue; 1308 1309 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n", 1310 stream ? "capture" : "playback", fe->dai_link->name, 1311 stream ? "<-" : "->", dpcm->be->dai_link->name); 1312 1313 /* BEs still alive need new FE */ 1314 dpcm_be_reparent(fe, dpcm->be, stream); 1315 1316 list_del(&dpcm->list_be); 1317 list_move(&dpcm->list_fe, &deleted_dpcms); 1318 } 1319 snd_soc_dpcm_stream_unlock_irq(fe, stream); 1320 1321 while (!list_empty(&deleted_dpcms)) { 1322 dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm, 1323 list_fe); 1324 list_del(&dpcm->list_fe); 1325 dpcm_remove_debugfs_state(dpcm); 1326 kfree(dpcm); 1327 } 1328 } 1329 1330 /* get BE for DAI widget and stream */ 1331 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card, 1332 struct snd_soc_dapm_widget *widget, int stream) 1333 { 1334 struct snd_soc_pcm_runtime *be; 1335 struct snd_soc_dapm_widget *w; 1336 struct snd_soc_dai *dai; 1337 int i; 1338 1339 dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name); 1340 1341 for_each_card_rtds(card, be) { 1342 1343 if (!be->dai_link->no_pcm) 1344 continue; 1345 1346 if (!snd_soc_dpcm_get_substream(be, stream)) 1347 continue; 1348 1349 for_each_rtd_dais(be, i, dai) { 1350 w = snd_soc_dai_get_widget(dai, stream); 1351 1352 dev_dbg(card->dev, "ASoC: try BE : %s\n", 1353 w ? w->name : "(not set)"); 1354 1355 if (w == widget) 1356 return be; 1357 } 1358 } 1359 1360 /* Widget provided is not a BE */ 1361 return NULL; 1362 } 1363 1364 int widget_in_list(struct snd_soc_dapm_widget_list *list, 1365 struct snd_soc_dapm_widget *widget) 1366 { 1367 struct snd_soc_dapm_widget *w; 1368 int i; 1369 1370 for_each_dapm_widgets(list, i, w) 1371 if (widget == w) 1372 return 1; 1373 1374 return 0; 1375 } 1376 EXPORT_SYMBOL_GPL(widget_in_list); 1377 1378 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir) 1379 { 1380 struct snd_soc_card *card = widget->dapm->card; 1381 struct snd_soc_pcm_runtime *rtd; 1382 int stream; 1383 1384 /* adjust dir to stream */ 1385 if (dir == SND_SOC_DAPM_DIR_OUT) 1386 stream = SNDRV_PCM_STREAM_PLAYBACK; 1387 else 1388 stream = SNDRV_PCM_STREAM_CAPTURE; 1389 1390 rtd = dpcm_get_be(card, widget, stream); 1391 if (rtd) 1392 return true; 1393 1394 return false; 1395 } 1396 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be); 1397 1398 int dpcm_path_get(struct snd_soc_pcm_runtime *fe, 1399 int stream, struct snd_soc_dapm_widget_list **list) 1400 { 1401 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0); 1402 int paths; 1403 1404 if (fe->dai_link->num_cpus > 1) { 1405 dev_err(fe->dev, 1406 "%s doesn't support Multi CPU yet\n", __func__); 1407 return -EINVAL; 1408 } 1409 1410 /* get number of valid DAI paths and their widgets */ 1411 paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list, 1412 fe->card->component_chaining ? 1413 NULL : dpcm_end_walk_at_be); 1414 1415 if (paths > 0) 1416 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths, 1417 stream ? "capture" : "playback"); 1418 else if (paths == 0) 1419 dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name, 1420 stream ? "capture" : "playback"); 1421 1422 return paths; 1423 } 1424 1425 void dpcm_path_put(struct snd_soc_dapm_widget_list **list) 1426 { 1427 snd_soc_dapm_dai_free_widgets(list); 1428 } 1429 1430 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream, 1431 struct snd_soc_dapm_widget_list *list) 1432 { 1433 struct snd_soc_dai *dai; 1434 unsigned int i; 1435 1436 /* is there a valid DAI widget for this BE */ 1437 for_each_rtd_dais(dpcm->be, i, dai) { 1438 struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream); 1439 1440 /* 1441 * The BE is pruned only if none of the dai 1442 * widgets are in the active list. 1443 */ 1444 if (widget && widget_in_list(list, widget)) 1445 return true; 1446 } 1447 1448 return false; 1449 } 1450 1451 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream, 1452 struct snd_soc_dapm_widget_list **list_) 1453 { 1454 struct snd_soc_dpcm *dpcm; 1455 int prune = 0; 1456 1457 /* Destroy any old FE <--> BE connections */ 1458 for_each_dpcm_be(fe, stream, dpcm) { 1459 if (dpcm_be_is_active(dpcm, stream, *list_)) 1460 continue; 1461 1462 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n", 1463 stream ? "capture" : "playback", 1464 dpcm->be->dai_link->name, fe->dai_link->name); 1465 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE; 1466 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE); 1467 prune++; 1468 } 1469 1470 dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune); 1471 return prune; 1472 } 1473 1474 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream, 1475 struct snd_soc_dapm_widget_list **list_) 1476 { 1477 struct snd_soc_card *card = fe->card; 1478 struct snd_soc_dapm_widget_list *list = *list_; 1479 struct snd_soc_pcm_runtime *be; 1480 struct snd_soc_dapm_widget *widget; 1481 struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream); 1482 int i, new = 0, err; 1483 1484 /* don't connect if FE is not running */ 1485 if (!fe_substream->runtime && !fe->fe_compr) 1486 return new; 1487 1488 /* Create any new FE <--> BE connections */ 1489 for_each_dapm_widgets(list, i, widget) { 1490 1491 switch (widget->id) { 1492 case snd_soc_dapm_dai_in: 1493 if (stream != SNDRV_PCM_STREAM_PLAYBACK) 1494 continue; 1495 break; 1496 case snd_soc_dapm_dai_out: 1497 if (stream != SNDRV_PCM_STREAM_CAPTURE) 1498 continue; 1499 break; 1500 default: 1501 continue; 1502 } 1503 1504 /* is there a valid BE rtd for this widget */ 1505 be = dpcm_get_be(card, widget, stream); 1506 if (!be) { 1507 dev_dbg(fe->dev, "ASoC: no BE found for %s\n", 1508 widget->name); 1509 continue; 1510 } 1511 1512 /* 1513 * Filter for systems with 'component_chaining' enabled. 1514 * This helps to avoid unnecessary re-configuration of an 1515 * already active BE on such systems. 1516 */ 1517 if (fe->card->component_chaining && 1518 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) && 1519 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE)) 1520 continue; 1521 1522 /* newly connected FE and BE */ 1523 err = dpcm_be_connect(fe, be, stream); 1524 if (err < 0) { 1525 dev_err(fe->dev, "ASoC: can't connect %s\n", 1526 widget->name); 1527 break; 1528 } else if (err == 0) /* already connected */ 1529 continue; 1530 1531 /* new */ 1532 dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE); 1533 new++; 1534 } 1535 1536 dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new); 1537 return new; 1538 } 1539 1540 /* 1541 * Find the corresponding BE DAIs that source or sink audio to this 1542 * FE substream. 1543 */ 1544 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe, 1545 int stream, struct snd_soc_dapm_widget_list **list, int new) 1546 { 1547 if (new) 1548 return dpcm_add_paths(fe, stream, list); 1549 else 1550 return dpcm_prune_paths(fe, stream, list); 1551 } 1552 1553 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream) 1554 { 1555 struct snd_soc_dpcm *dpcm; 1556 1557 for_each_dpcm_be(fe, stream, dpcm) 1558 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO); 1559 } 1560 1561 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream, 1562 int do_hw_free, struct snd_soc_dpcm *last) 1563 { 1564 struct snd_soc_dpcm *dpcm; 1565 1566 /* disable any enabled and non active backends */ 1567 for_each_dpcm_be(fe, stream, dpcm) { 1568 struct snd_soc_pcm_runtime *be = dpcm->be; 1569 struct snd_pcm_substream *be_substream = 1570 snd_soc_dpcm_get_substream(be, stream); 1571 1572 if (dpcm == last) 1573 return; 1574 1575 /* is this op for this BE ? */ 1576 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1577 continue; 1578 1579 if (be->dpcm[stream].users == 0) { 1580 dev_err(be->dev, "ASoC: no users %s at close - state %d\n", 1581 stream ? "capture" : "playback", 1582 be->dpcm[stream].state); 1583 continue; 1584 } 1585 1586 if (--be->dpcm[stream].users != 0) 1587 continue; 1588 1589 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) { 1590 if (!do_hw_free) 1591 continue; 1592 1593 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) { 1594 __soc_pcm_hw_free(be, be_substream); 1595 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE; 1596 } 1597 } 1598 1599 __soc_pcm_close(be, be_substream); 1600 be_substream->runtime = NULL; 1601 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1602 } 1603 } 1604 1605 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream) 1606 { 1607 struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream); 1608 struct snd_soc_pcm_runtime *be; 1609 struct snd_soc_dpcm *dpcm; 1610 int err, count = 0; 1611 1612 /* only startup BE DAIs that are either sinks or sources to this FE DAI */ 1613 for_each_dpcm_be(fe, stream, dpcm) { 1614 struct snd_pcm_substream *be_substream; 1615 1616 be = dpcm->be; 1617 be_substream = snd_soc_dpcm_get_substream(be, stream); 1618 1619 if (!be_substream) { 1620 dev_err(be->dev, "ASoC: no backend %s stream\n", 1621 stream ? "capture" : "playback"); 1622 continue; 1623 } 1624 1625 /* is this op for this BE ? */ 1626 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1627 continue; 1628 1629 /* first time the dpcm is open ? */ 1630 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) { 1631 dev_err(be->dev, "ASoC: too many users %s at open %d\n", 1632 stream ? "capture" : "playback", 1633 be->dpcm[stream].state); 1634 continue; 1635 } 1636 1637 if (be->dpcm[stream].users++ != 0) 1638 continue; 1639 1640 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) && 1641 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE)) 1642 continue; 1643 1644 dev_dbg(be->dev, "ASoC: open %s BE %s\n", 1645 stream ? "capture" : "playback", be->dai_link->name); 1646 1647 be_substream->runtime = fe_substream->runtime; 1648 err = __soc_pcm_open(be, be_substream); 1649 if (err < 0) { 1650 be->dpcm[stream].users--; 1651 if (be->dpcm[stream].users < 0) 1652 dev_err(be->dev, "ASoC: no users %s at unwind %d\n", 1653 stream ? "capture" : "playback", 1654 be->dpcm[stream].state); 1655 1656 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1657 goto unwind; 1658 } 1659 be->dpcm[stream].be_start = 0; 1660 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN; 1661 count++; 1662 } 1663 1664 return count; 1665 1666 unwind: 1667 dpcm_be_dai_startup_rollback(fe, stream, dpcm); 1668 1669 return soc_pcm_ret(fe, err); 1670 } 1671 1672 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream) 1673 { 1674 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1675 struct snd_pcm_runtime *runtime = substream->runtime; 1676 struct snd_pcm_hardware *hw = &runtime->hw; 1677 struct snd_soc_dai *dai; 1678 int stream = substream->stream; 1679 u64 formats = hw->formats; 1680 int i; 1681 1682 soc_pcm_hw_init(hw); 1683 1684 if (formats) 1685 hw->formats &= formats; 1686 1687 for_each_rtd_cpu_dais(fe, i, dai) { 1688 struct snd_soc_pcm_stream *cpu_stream; 1689 1690 /* 1691 * Skip CPUs which don't support the current stream 1692 * type. See soc_pcm_init_runtime_hw() for more details 1693 */ 1694 if (!snd_soc_dai_stream_valid(dai, stream)) 1695 continue; 1696 1697 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream); 1698 1699 soc_pcm_hw_update_rate(hw, cpu_stream); 1700 soc_pcm_hw_update_chan(hw, cpu_stream); 1701 soc_pcm_hw_update_format(hw, cpu_stream); 1702 } 1703 1704 } 1705 1706 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream) 1707 { 1708 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1709 struct snd_pcm_runtime *runtime = substream->runtime; 1710 struct snd_pcm_hardware *hw = &runtime->hw; 1711 struct snd_soc_dpcm *dpcm; 1712 struct snd_soc_dai *dai; 1713 int stream = substream->stream; 1714 1715 if (!fe->dai_link->dpcm_merged_format) 1716 return; 1717 1718 /* 1719 * It returns merged BE codec format 1720 * if FE want to use it (= dpcm_merged_format) 1721 */ 1722 1723 for_each_dpcm_be(fe, stream, dpcm) { 1724 struct snd_soc_pcm_runtime *be = dpcm->be; 1725 struct snd_soc_pcm_stream *codec_stream; 1726 int i; 1727 1728 for_each_rtd_codec_dais(be, i, dai) { 1729 /* 1730 * Skip CODECs which don't support the current stream 1731 * type. See soc_pcm_init_runtime_hw() for more details 1732 */ 1733 if (!snd_soc_dai_stream_valid(dai, stream)) 1734 continue; 1735 1736 codec_stream = snd_soc_dai_get_pcm_stream(dai, stream); 1737 1738 soc_pcm_hw_update_format(hw, codec_stream); 1739 } 1740 } 1741 } 1742 1743 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream) 1744 { 1745 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1746 struct snd_pcm_runtime *runtime = substream->runtime; 1747 struct snd_pcm_hardware *hw = &runtime->hw; 1748 struct snd_soc_dpcm *dpcm; 1749 int stream = substream->stream; 1750 1751 if (!fe->dai_link->dpcm_merged_chan) 1752 return; 1753 1754 /* 1755 * It returns merged BE codec channel; 1756 * if FE want to use it (= dpcm_merged_chan) 1757 */ 1758 1759 for_each_dpcm_be(fe, stream, dpcm) { 1760 struct snd_soc_pcm_runtime *be = dpcm->be; 1761 struct snd_soc_pcm_stream *cpu_stream; 1762 struct snd_soc_dai *dai; 1763 int i; 1764 1765 for_each_rtd_cpu_dais(be, i, dai) { 1766 /* 1767 * Skip CPUs which don't support the current stream 1768 * type. See soc_pcm_init_runtime_hw() for more details 1769 */ 1770 if (!snd_soc_dai_stream_valid(dai, stream)) 1771 continue; 1772 1773 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream); 1774 1775 soc_pcm_hw_update_chan(hw, cpu_stream); 1776 } 1777 1778 /* 1779 * chan min/max cannot be enforced if there are multiple CODEC 1780 * DAIs connected to a single CPU DAI, use CPU DAI's directly 1781 */ 1782 if (be->dai_link->num_codecs == 1) { 1783 struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream( 1784 asoc_rtd_to_codec(be, 0), stream); 1785 1786 soc_pcm_hw_update_chan(hw, codec_stream); 1787 } 1788 } 1789 } 1790 1791 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream) 1792 { 1793 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1794 struct snd_pcm_runtime *runtime = substream->runtime; 1795 struct snd_pcm_hardware *hw = &runtime->hw; 1796 struct snd_soc_dpcm *dpcm; 1797 int stream = substream->stream; 1798 1799 if (!fe->dai_link->dpcm_merged_rate) 1800 return; 1801 1802 /* 1803 * It returns merged BE codec channel; 1804 * if FE want to use it (= dpcm_merged_chan) 1805 */ 1806 1807 for_each_dpcm_be(fe, stream, dpcm) { 1808 struct snd_soc_pcm_runtime *be = dpcm->be; 1809 struct snd_soc_pcm_stream *pcm; 1810 struct snd_soc_dai *dai; 1811 int i; 1812 1813 for_each_rtd_dais(be, i, dai) { 1814 /* 1815 * Skip DAIs which don't support the current stream 1816 * type. See soc_pcm_init_runtime_hw() for more details 1817 */ 1818 if (!snd_soc_dai_stream_valid(dai, stream)) 1819 continue; 1820 1821 pcm = snd_soc_dai_get_pcm_stream(dai, stream); 1822 1823 soc_pcm_hw_update_rate(hw, pcm); 1824 } 1825 } 1826 } 1827 1828 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream, 1829 int stream) 1830 { 1831 struct snd_soc_dpcm *dpcm; 1832 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream); 1833 struct snd_soc_dai *fe_cpu_dai; 1834 int err = 0; 1835 int i; 1836 1837 /* apply symmetry for FE */ 1838 soc_pcm_update_symmetry(fe_substream); 1839 1840 for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) { 1841 /* Symmetry only applies if we've got an active stream. */ 1842 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai); 1843 if (err < 0) 1844 goto error; 1845 } 1846 1847 /* apply symmetry for BE */ 1848 for_each_dpcm_be(fe, stream, dpcm) { 1849 struct snd_soc_pcm_runtime *be = dpcm->be; 1850 struct snd_pcm_substream *be_substream = 1851 snd_soc_dpcm_get_substream(be, stream); 1852 struct snd_soc_pcm_runtime *rtd; 1853 struct snd_soc_dai *dai; 1854 1855 /* A backend may not have the requested substream */ 1856 if (!be_substream) 1857 continue; 1858 1859 rtd = asoc_substream_to_rtd(be_substream); 1860 if (rtd->dai_link->be_hw_params_fixup) 1861 continue; 1862 1863 soc_pcm_update_symmetry(be_substream); 1864 1865 /* Symmetry only applies if we've got an active stream. */ 1866 for_each_rtd_dais(rtd, i, dai) { 1867 err = soc_pcm_apply_symmetry(fe_substream, dai); 1868 if (err < 0) 1869 goto error; 1870 } 1871 } 1872 error: 1873 return soc_pcm_ret(fe, err); 1874 } 1875 1876 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream) 1877 { 1878 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream); 1879 int stream = fe_substream->stream, ret = 0; 1880 1881 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 1882 1883 ret = dpcm_be_dai_startup(fe, stream); 1884 if (ret < 0) 1885 goto be_err; 1886 1887 dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name); 1888 1889 /* start the DAI frontend */ 1890 ret = __soc_pcm_open(fe, fe_substream); 1891 if (ret < 0) 1892 goto unwind; 1893 1894 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN; 1895 1896 dpcm_runtime_setup_fe(fe_substream); 1897 1898 dpcm_runtime_setup_be_format(fe_substream); 1899 dpcm_runtime_setup_be_chan(fe_substream); 1900 dpcm_runtime_setup_be_rate(fe_substream); 1901 1902 ret = dpcm_apply_symmetry(fe_substream, stream); 1903 1904 unwind: 1905 if (ret < 0) 1906 dpcm_be_dai_startup_unwind(fe, stream); 1907 be_err: 1908 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 1909 1910 return soc_pcm_ret(fe, ret); 1911 } 1912 1913 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream) 1914 { 1915 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1916 int stream = substream->stream; 1917 1918 snd_soc_dpcm_mutex_assert_held(fe); 1919 1920 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 1921 1922 /* shutdown the BEs */ 1923 dpcm_be_dai_shutdown(fe, stream); 1924 1925 dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name); 1926 1927 /* now shutdown the frontend */ 1928 __soc_pcm_close(fe, substream); 1929 1930 /* run the stream stop event */ 1931 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP); 1932 1933 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE; 1934 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 1935 return 0; 1936 } 1937 1938 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream) 1939 { 1940 struct snd_soc_dpcm *dpcm; 1941 1942 /* only hw_params backends that are either sinks or sources 1943 * to this frontend DAI */ 1944 for_each_dpcm_be(fe, stream, dpcm) { 1945 1946 struct snd_soc_pcm_runtime *be = dpcm->be; 1947 struct snd_pcm_substream *be_substream = 1948 snd_soc_dpcm_get_substream(be, stream); 1949 1950 /* is this op for this BE ? */ 1951 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 1952 continue; 1953 1954 /* only free hw when no longer used - check all FEs */ 1955 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream)) 1956 continue; 1957 1958 /* do not free hw if this BE is used by other FE */ 1959 if (be->dpcm[stream].users > 1) 1960 continue; 1961 1962 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 1963 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) && 1964 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) && 1965 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) && 1966 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) && 1967 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND)) 1968 continue; 1969 1970 dev_dbg(be->dev, "ASoC: hw_free BE %s\n", 1971 be->dai_link->name); 1972 1973 __soc_pcm_hw_free(be, be_substream); 1974 1975 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE; 1976 } 1977 } 1978 1979 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream) 1980 { 1981 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 1982 int stream = substream->stream; 1983 1984 snd_soc_dpcm_mutex_lock(fe); 1985 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 1986 1987 dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name); 1988 1989 /* call hw_free on the frontend */ 1990 soc_pcm_hw_clean(fe, substream, 0); 1991 1992 /* only hw_params backends that are either sinks or sources 1993 * to this frontend DAI */ 1994 dpcm_be_dai_hw_free(fe, stream); 1995 1996 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE; 1997 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 1998 1999 snd_soc_dpcm_mutex_unlock(fe); 2000 return 0; 2001 } 2002 2003 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream) 2004 { 2005 struct snd_soc_pcm_runtime *be; 2006 struct snd_pcm_substream *be_substream; 2007 struct snd_soc_dpcm *dpcm; 2008 int ret; 2009 2010 for_each_dpcm_be(fe, stream, dpcm) { 2011 struct snd_pcm_hw_params hw_params; 2012 2013 be = dpcm->be; 2014 be_substream = snd_soc_dpcm_get_substream(be, stream); 2015 2016 /* is this op for this BE ? */ 2017 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2018 continue; 2019 2020 /* copy params for each dpcm */ 2021 memcpy(&hw_params, &fe->dpcm[stream].hw_params, 2022 sizeof(struct snd_pcm_hw_params)); 2023 2024 /* perform any hw_params fixups */ 2025 ret = snd_soc_link_be_hw_params_fixup(be, &hw_params); 2026 if (ret < 0) 2027 goto unwind; 2028 2029 /* copy the fixed-up hw params for BE dai */ 2030 memcpy(&be->dpcm[stream].hw_params, &hw_params, 2031 sizeof(struct snd_pcm_hw_params)); 2032 2033 /* only allow hw_params() if no connected FEs are running */ 2034 if (!snd_soc_dpcm_can_be_params(fe, be, stream)) 2035 continue; 2036 2037 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) && 2038 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 2039 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE)) 2040 continue; 2041 2042 dev_dbg(be->dev, "ASoC: hw_params BE %s\n", 2043 be->dai_link->name); 2044 2045 ret = __soc_pcm_hw_params(be, be_substream, &hw_params); 2046 if (ret < 0) 2047 goto unwind; 2048 2049 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS; 2050 } 2051 return 0; 2052 2053 unwind: 2054 dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n", 2055 __func__, be->dai_link->name, ret); 2056 2057 /* disable any enabled and non active backends */ 2058 for_each_dpcm_be_rollback(fe, stream, dpcm) { 2059 be = dpcm->be; 2060 be_substream = snd_soc_dpcm_get_substream(be, stream); 2061 2062 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2063 continue; 2064 2065 /* only allow hw_free() if no connected FEs are running */ 2066 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream)) 2067 continue; 2068 2069 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) && 2070 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 2071 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) && 2072 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)) 2073 continue; 2074 2075 __soc_pcm_hw_free(be, be_substream); 2076 } 2077 2078 return ret; 2079 } 2080 2081 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream, 2082 struct snd_pcm_hw_params *params) 2083 { 2084 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 2085 int ret, stream = substream->stream; 2086 2087 snd_soc_dpcm_mutex_lock(fe); 2088 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 2089 2090 memcpy(&fe->dpcm[stream].hw_params, params, 2091 sizeof(struct snd_pcm_hw_params)); 2092 ret = dpcm_be_dai_hw_params(fe, stream); 2093 if (ret < 0) 2094 goto out; 2095 2096 dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n", 2097 fe->dai_link->name, params_rate(params), 2098 params_channels(params), params_format(params)); 2099 2100 /* call hw_params on the frontend */ 2101 ret = __soc_pcm_hw_params(fe, substream, params); 2102 if (ret < 0) 2103 dpcm_be_dai_hw_free(fe, stream); 2104 else 2105 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS; 2106 2107 out: 2108 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 2109 snd_soc_dpcm_mutex_unlock(fe); 2110 2111 return soc_pcm_ret(fe, ret); 2112 } 2113 2114 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, 2115 int cmd) 2116 { 2117 struct snd_soc_pcm_runtime *be; 2118 bool pause_stop_transition; 2119 struct snd_soc_dpcm *dpcm; 2120 unsigned long flags; 2121 int ret = 0; 2122 2123 for_each_dpcm_be(fe, stream, dpcm) { 2124 struct snd_pcm_substream *be_substream; 2125 2126 be = dpcm->be; 2127 be_substream = snd_soc_dpcm_get_substream(be, stream); 2128 2129 snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags); 2130 2131 /* is this op for this BE ? */ 2132 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2133 goto next; 2134 2135 dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n", 2136 be->dai_link->name, cmd); 2137 2138 switch (cmd) { 2139 case SNDRV_PCM_TRIGGER_START: 2140 if (!be->dpcm[stream].be_start && 2141 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) && 2142 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) && 2143 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) 2144 goto next; 2145 2146 be->dpcm[stream].be_start++; 2147 if (be->dpcm[stream].be_start != 1) 2148 goto next; 2149 2150 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED) 2151 ret = soc_pcm_trigger(be_substream, 2152 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 2153 else 2154 ret = soc_pcm_trigger(be_substream, 2155 SNDRV_PCM_TRIGGER_START); 2156 if (ret) { 2157 be->dpcm[stream].be_start--; 2158 goto next; 2159 } 2160 2161 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2162 break; 2163 case SNDRV_PCM_TRIGGER_RESUME: 2164 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND)) 2165 goto next; 2166 2167 be->dpcm[stream].be_start++; 2168 if (be->dpcm[stream].be_start != 1) 2169 goto next; 2170 2171 ret = soc_pcm_trigger(be_substream, cmd); 2172 if (ret) { 2173 be->dpcm[stream].be_start--; 2174 goto next; 2175 } 2176 2177 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2178 break; 2179 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2180 if (!be->dpcm[stream].be_start && 2181 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) && 2182 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) 2183 goto next; 2184 2185 fe->dpcm[stream].fe_pause = false; 2186 be->dpcm[stream].be_pause--; 2187 2188 be->dpcm[stream].be_start++; 2189 if (be->dpcm[stream].be_start != 1) 2190 goto next; 2191 2192 ret = soc_pcm_trigger(be_substream, cmd); 2193 if (ret) { 2194 be->dpcm[stream].be_start--; 2195 goto next; 2196 } 2197 2198 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2199 break; 2200 case SNDRV_PCM_TRIGGER_STOP: 2201 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) && 2202 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) 2203 goto next; 2204 2205 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START) 2206 be->dpcm[stream].be_start--; 2207 2208 if (be->dpcm[stream].be_start != 0) 2209 goto next; 2210 2211 pause_stop_transition = false; 2212 if (fe->dpcm[stream].fe_pause) { 2213 pause_stop_transition = true; 2214 fe->dpcm[stream].fe_pause = false; 2215 be->dpcm[stream].be_pause--; 2216 } 2217 2218 if (be->dpcm[stream].be_pause != 0) 2219 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH); 2220 else 2221 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP); 2222 2223 if (ret) { 2224 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START) 2225 be->dpcm[stream].be_start++; 2226 if (pause_stop_transition) { 2227 fe->dpcm[stream].fe_pause = true; 2228 be->dpcm[stream].be_pause++; 2229 } 2230 goto next; 2231 } 2232 2233 if (be->dpcm[stream].be_pause != 0) 2234 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED; 2235 else 2236 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP; 2237 2238 break; 2239 case SNDRV_PCM_TRIGGER_SUSPEND: 2240 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) 2241 goto next; 2242 2243 be->dpcm[stream].be_start--; 2244 if (be->dpcm[stream].be_start != 0) 2245 goto next; 2246 2247 ret = soc_pcm_trigger(be_substream, cmd); 2248 if (ret) { 2249 be->dpcm[stream].be_start++; 2250 goto next; 2251 } 2252 2253 be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND; 2254 break; 2255 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2256 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) 2257 goto next; 2258 2259 fe->dpcm[stream].fe_pause = true; 2260 be->dpcm[stream].be_pause++; 2261 2262 be->dpcm[stream].be_start--; 2263 if (be->dpcm[stream].be_start != 0) 2264 goto next; 2265 2266 ret = soc_pcm_trigger(be_substream, cmd); 2267 if (ret) { 2268 be->dpcm[stream].be_start++; 2269 goto next; 2270 } 2271 2272 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED; 2273 break; 2274 } 2275 next: 2276 snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags); 2277 if (ret) 2278 break; 2279 } 2280 return soc_pcm_ret(fe, ret); 2281 } 2282 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger); 2283 2284 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream, 2285 int cmd, bool fe_first) 2286 { 2287 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 2288 int ret; 2289 2290 /* call trigger on the frontend before the backend. */ 2291 if (fe_first) { 2292 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n", 2293 fe->dai_link->name, cmd); 2294 2295 ret = soc_pcm_trigger(substream, cmd); 2296 if (ret < 0) 2297 return ret; 2298 2299 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd); 2300 return ret; 2301 } 2302 2303 /* call trigger on the frontend after the backend. */ 2304 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd); 2305 if (ret < 0) 2306 return ret; 2307 2308 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n", 2309 fe->dai_link->name, cmd); 2310 2311 ret = soc_pcm_trigger(substream, cmd); 2312 2313 return ret; 2314 } 2315 2316 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd) 2317 { 2318 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 2319 int stream = substream->stream; 2320 int ret = 0; 2321 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream]; 2322 2323 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE; 2324 2325 switch (trigger) { 2326 case SND_SOC_DPCM_TRIGGER_PRE: 2327 switch (cmd) { 2328 case SNDRV_PCM_TRIGGER_START: 2329 case SNDRV_PCM_TRIGGER_RESUME: 2330 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2331 case SNDRV_PCM_TRIGGER_DRAIN: 2332 ret = dpcm_dai_trigger_fe_be(substream, cmd, true); 2333 break; 2334 case SNDRV_PCM_TRIGGER_STOP: 2335 case SNDRV_PCM_TRIGGER_SUSPEND: 2336 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2337 ret = dpcm_dai_trigger_fe_be(substream, cmd, false); 2338 break; 2339 default: 2340 ret = -EINVAL; 2341 break; 2342 } 2343 break; 2344 case SND_SOC_DPCM_TRIGGER_POST: 2345 switch (cmd) { 2346 case SNDRV_PCM_TRIGGER_START: 2347 case SNDRV_PCM_TRIGGER_RESUME: 2348 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2349 case SNDRV_PCM_TRIGGER_DRAIN: 2350 ret = dpcm_dai_trigger_fe_be(substream, cmd, false); 2351 break; 2352 case SNDRV_PCM_TRIGGER_STOP: 2353 case SNDRV_PCM_TRIGGER_SUSPEND: 2354 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2355 ret = dpcm_dai_trigger_fe_be(substream, cmd, true); 2356 break; 2357 default: 2358 ret = -EINVAL; 2359 break; 2360 } 2361 break; 2362 case SND_SOC_DPCM_TRIGGER_BESPOKE: 2363 /* bespoke trigger() - handles both FE and BEs */ 2364 2365 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n", 2366 fe->dai_link->name, cmd); 2367 2368 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd); 2369 break; 2370 default: 2371 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd, 2372 fe->dai_link->name); 2373 ret = -EINVAL; 2374 goto out; 2375 } 2376 2377 if (ret < 0) { 2378 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n", 2379 cmd, ret); 2380 goto out; 2381 } 2382 2383 switch (cmd) { 2384 case SNDRV_PCM_TRIGGER_START: 2385 case SNDRV_PCM_TRIGGER_RESUME: 2386 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2387 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START; 2388 break; 2389 case SNDRV_PCM_TRIGGER_STOP: 2390 case SNDRV_PCM_TRIGGER_SUSPEND: 2391 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP; 2392 break; 2393 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2394 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED; 2395 break; 2396 } 2397 2398 out: 2399 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO; 2400 return ret; 2401 } 2402 2403 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd) 2404 { 2405 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 2406 int stream = substream->stream; 2407 2408 /* if FE's runtime_update is already set, we're in race; 2409 * process this trigger later at exit 2410 */ 2411 if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) { 2412 fe->dpcm[stream].trigger_pending = cmd + 1; 2413 return 0; /* delayed, assuming it's successful */ 2414 } 2415 2416 /* we're alone, let's trigger */ 2417 return dpcm_fe_dai_do_trigger(substream, cmd); 2418 } 2419 2420 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream) 2421 { 2422 struct snd_soc_dpcm *dpcm; 2423 int ret = 0; 2424 2425 for_each_dpcm_be(fe, stream, dpcm) { 2426 2427 struct snd_soc_pcm_runtime *be = dpcm->be; 2428 struct snd_pcm_substream *be_substream = 2429 snd_soc_dpcm_get_substream(be, stream); 2430 2431 /* is this op for this BE ? */ 2432 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2433 continue; 2434 2435 if (!snd_soc_dpcm_can_be_prepared(fe, be, stream)) 2436 continue; 2437 2438 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && 2439 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) && 2440 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) && 2441 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) 2442 continue; 2443 2444 dev_dbg(be->dev, "ASoC: prepare BE %s\n", 2445 be->dai_link->name); 2446 2447 ret = __soc_pcm_prepare(be, be_substream); 2448 if (ret < 0) 2449 break; 2450 2451 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE; 2452 } 2453 2454 return soc_pcm_ret(fe, ret); 2455 } 2456 2457 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream) 2458 { 2459 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream); 2460 int stream = substream->stream, ret = 0; 2461 2462 snd_soc_dpcm_mutex_lock(fe); 2463 2464 dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name); 2465 2466 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); 2467 2468 /* there is no point preparing this FE if there are no BEs */ 2469 if (list_empty(&fe->dpcm[stream].be_clients)) { 2470 /* dev_err_once() for visibility, dev_dbg() for debugging UCM profiles */ 2471 dev_err_once(fe->dev, "ASoC: no backend DAIs enabled for %s, possibly missing ALSA mixer-based routing or UCM profile\n", 2472 fe->dai_link->name); 2473 dev_dbg(fe->dev, "ASoC: no backend DAIs enabled for %s\n", 2474 fe->dai_link->name); 2475 ret = -EINVAL; 2476 goto out; 2477 } 2478 2479 ret = dpcm_be_dai_prepare(fe, stream); 2480 if (ret < 0) 2481 goto out; 2482 2483 /* call prepare on the frontend */ 2484 ret = __soc_pcm_prepare(fe, substream); 2485 if (ret < 0) 2486 goto out; 2487 2488 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE; 2489 2490 out: 2491 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 2492 snd_soc_dpcm_mutex_unlock(fe); 2493 2494 return soc_pcm_ret(fe, ret); 2495 } 2496 2497 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream) 2498 { 2499 struct snd_pcm_substream *substream = 2500 snd_soc_dpcm_get_substream(fe, stream); 2501 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream]; 2502 int err; 2503 2504 dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n", 2505 stream ? "capture" : "playback", fe->dai_link->name); 2506 2507 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) { 2508 /* call bespoke trigger - FE takes care of all BE triggers */ 2509 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n", 2510 fe->dai_link->name); 2511 2512 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP); 2513 } else { 2514 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n", 2515 fe->dai_link->name); 2516 2517 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP); 2518 } 2519 2520 dpcm_be_dai_hw_free(fe, stream); 2521 2522 dpcm_be_dai_shutdown(fe, stream); 2523 2524 /* run the stream event for each BE */ 2525 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP); 2526 2527 return soc_pcm_ret(fe, err); 2528 } 2529 2530 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream) 2531 { 2532 struct snd_pcm_substream *substream = 2533 snd_soc_dpcm_get_substream(fe, stream); 2534 struct snd_soc_dpcm *dpcm; 2535 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream]; 2536 int ret = 0; 2537 2538 dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n", 2539 stream ? "capture" : "playback", fe->dai_link->name); 2540 2541 /* Only start the BE if the FE is ready */ 2542 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE || 2543 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) { 2544 dev_err(fe->dev, "ASoC: FE %s is not ready %d\n", 2545 fe->dai_link->name, fe->dpcm[stream].state); 2546 ret = -EINVAL; 2547 goto disconnect; 2548 } 2549 2550 /* startup must always be called for new BEs */ 2551 ret = dpcm_be_dai_startup(fe, stream); 2552 if (ret < 0) 2553 goto disconnect; 2554 2555 /* keep going if FE state is > open */ 2556 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN) 2557 return 0; 2558 2559 ret = dpcm_be_dai_hw_params(fe, stream); 2560 if (ret < 0) 2561 goto close; 2562 2563 /* keep going if FE state is > hw_params */ 2564 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS) 2565 return 0; 2566 2567 ret = dpcm_be_dai_prepare(fe, stream); 2568 if (ret < 0) 2569 goto hw_free; 2570 2571 /* run the stream event for each BE */ 2572 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP); 2573 2574 /* keep going if FE state is > prepare */ 2575 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE || 2576 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP) 2577 return 0; 2578 2579 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) { 2580 /* call trigger on the frontend - FE takes care of all BE triggers */ 2581 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n", 2582 fe->dai_link->name); 2583 2584 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START); 2585 if (ret < 0) 2586 goto hw_free; 2587 } else { 2588 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n", 2589 fe->dai_link->name); 2590 2591 ret = dpcm_be_dai_trigger(fe, stream, 2592 SNDRV_PCM_TRIGGER_START); 2593 if (ret < 0) 2594 goto hw_free; 2595 } 2596 2597 return 0; 2598 2599 hw_free: 2600 dpcm_be_dai_hw_free(fe, stream); 2601 close: 2602 dpcm_be_dai_shutdown(fe, stream); 2603 disconnect: 2604 /* disconnect any pending BEs */ 2605 for_each_dpcm_be(fe, stream, dpcm) { 2606 struct snd_soc_pcm_runtime *be = dpcm->be; 2607 2608 /* is this op for this BE ? */ 2609 if (!snd_soc_dpcm_be_can_update(fe, be, stream)) 2610 continue; 2611 2612 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE || 2613 be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW) 2614 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE; 2615 } 2616 2617 return soc_pcm_ret(fe, ret); 2618 } 2619 2620 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new) 2621 { 2622 struct snd_soc_dapm_widget_list *list; 2623 int stream; 2624 int count, paths; 2625 2626 if (!fe->dai_link->dynamic) 2627 return 0; 2628 2629 if (fe->dai_link->num_cpus > 1) { 2630 dev_err(fe->dev, 2631 "%s doesn't support Multi CPU yet\n", __func__); 2632 return -EINVAL; 2633 } 2634 2635 /* only check active links */ 2636 if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0))) 2637 return 0; 2638 2639 /* DAPM sync will call this to update DSP paths */ 2640 dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n", 2641 new ? "new" : "old", fe->dai_link->name); 2642 2643 for_each_pcm_streams(stream) { 2644 2645 /* skip if FE doesn't have playback/capture capability */ 2646 if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream) || 2647 !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream)) 2648 continue; 2649 2650 /* skip if FE isn't currently playing/capturing */ 2651 if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) || 2652 !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream)) 2653 continue; 2654 2655 paths = dpcm_path_get(fe, stream, &list); 2656 if (paths < 0) 2657 return paths; 2658 2659 /* update any playback/capture paths */ 2660 count = dpcm_process_paths(fe, stream, &list, new); 2661 if (count) { 2662 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE); 2663 if (new) 2664 dpcm_run_update_startup(fe, stream); 2665 else 2666 dpcm_run_update_shutdown(fe, stream); 2667 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); 2668 2669 dpcm_clear_pending_state(fe, stream); 2670 dpcm_be_disconnect(fe, stream); 2671 } 2672 2673 dpcm_path_put(&list); 2674 } 2675 2676 return 0; 2677 } 2678 2679 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and 2680 * any DAI links. 2681 */ 2682 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card) 2683 { 2684 struct snd_soc_pcm_runtime *fe; 2685 int ret = 0; 2686 2687 snd_soc_dpcm_mutex_lock(card); 2688 /* shutdown all old paths first */ 2689 for_each_card_rtds(card, fe) { 2690 ret = soc_dpcm_fe_runtime_update(fe, 0); 2691 if (ret) 2692 goto out; 2693 } 2694 2695 /* bring new paths up */ 2696 for_each_card_rtds(card, fe) { 2697 ret = soc_dpcm_fe_runtime_update(fe, 1); 2698 if (ret) 2699 goto out; 2700 } 2701 2702 out: 2703 snd_soc_dpcm_mutex_unlock(card); 2704 return ret; 2705 } 2706 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update); 2707 2708 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream) 2709 { 2710 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream); 2711 struct snd_soc_dpcm *dpcm; 2712 int stream = fe_substream->stream; 2713 2714 snd_soc_dpcm_mutex_assert_held(fe); 2715 2716 /* mark FE's links ready to prune */ 2717 for_each_dpcm_be(fe, stream, dpcm) 2718 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE; 2719 2720 dpcm_be_disconnect(fe, stream); 2721 } 2722 2723 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream) 2724 { 2725 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream); 2726 int ret; 2727 2728 snd_soc_dpcm_mutex_lock(fe); 2729 ret = dpcm_fe_dai_shutdown(fe_substream); 2730 2731 dpcm_fe_dai_cleanup(fe_substream); 2732 2733 snd_soc_dpcm_mutex_unlock(fe); 2734 return ret; 2735 } 2736 2737 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream) 2738 { 2739 struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream); 2740 struct snd_soc_dapm_widget_list *list; 2741 int ret; 2742 int stream = fe_substream->stream; 2743 2744 snd_soc_dpcm_mutex_lock(fe); 2745 2746 ret = dpcm_path_get(fe, stream, &list); 2747 if (ret < 0) 2748 goto open_end; 2749 2750 /* calculate valid and active FE <-> BE dpcms */ 2751 dpcm_process_paths(fe, stream, &list, 1); 2752 2753 ret = dpcm_fe_dai_startup(fe_substream); 2754 if (ret < 0) 2755 dpcm_fe_dai_cleanup(fe_substream); 2756 2757 dpcm_clear_pending_state(fe, stream); 2758 dpcm_path_put(&list); 2759 open_end: 2760 snd_soc_dpcm_mutex_unlock(fe); 2761 return ret; 2762 } 2763 2764 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd, 2765 int *playback, int *capture) 2766 { 2767 struct snd_soc_dai_link *dai_link = rtd->dai_link; 2768 struct snd_soc_dai *cpu_dai; 2769 int has_playback = 0; 2770 int has_capture = 0; 2771 int i; 2772 2773 if (dai_link->dynamic && dai_link->num_cpus > 1) { 2774 dev_err(rtd->dev, "DPCM doesn't support Multi CPU for Front-Ends yet\n"); 2775 return -EINVAL; 2776 } 2777 2778 if (dai_link->dynamic || dai_link->no_pcm) { 2779 int stream; 2780 2781 if (dai_link->dpcm_playback) { 2782 stream = SNDRV_PCM_STREAM_PLAYBACK; 2783 2784 for_each_rtd_cpu_dais(rtd, i, cpu_dai) { 2785 if (snd_soc_dai_stream_valid(cpu_dai, stream)) { 2786 has_playback = 1; 2787 break; 2788 } 2789 } 2790 if (!has_playback) { 2791 dev_err(rtd->card->dev, 2792 "No CPU DAIs support playback for stream %s\n", 2793 dai_link->stream_name); 2794 return -EINVAL; 2795 } 2796 } 2797 if (dai_link->dpcm_capture) { 2798 stream = SNDRV_PCM_STREAM_CAPTURE; 2799 2800 for_each_rtd_cpu_dais(rtd, i, cpu_dai) { 2801 if (snd_soc_dai_stream_valid(cpu_dai, stream)) { 2802 has_capture = 1; 2803 break; 2804 } 2805 } 2806 2807 if (!has_capture) { 2808 dev_err(rtd->card->dev, 2809 "No CPU DAIs support capture for stream %s\n", 2810 dai_link->stream_name); 2811 return -EINVAL; 2812 } 2813 } 2814 } else { 2815 struct snd_soc_dai *codec_dai; 2816 2817 /* Adapt stream for codec2codec links */ 2818 int cpu_capture = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_CAPTURE); 2819 int cpu_playback = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_PLAYBACK); 2820 2821 for_each_rtd_codec_dais(rtd, i, codec_dai) { 2822 if (dai_link->num_cpus == 1) { 2823 cpu_dai = asoc_rtd_to_cpu(rtd, 0); 2824 } else if (dai_link->num_cpus == dai_link->num_codecs) { 2825 cpu_dai = asoc_rtd_to_cpu(rtd, i); 2826 } else if (rtd->dai_link->num_codecs > rtd->dai_link->num_cpus) { 2827 int cpu_id; 2828 2829 if (!rtd->dai_link->codec_ch_maps) { 2830 dev_err(rtd->card->dev, "%s: no codec channel mapping table provided\n", 2831 __func__); 2832 return -EINVAL; 2833 } 2834 2835 cpu_id = rtd->dai_link->codec_ch_maps[i].connected_cpu_id; 2836 cpu_dai = asoc_rtd_to_cpu(rtd, cpu_id); 2837 } else { 2838 dev_err(rtd->card->dev, 2839 "%s codec number %d < cpu number %d is not supported\n", 2840 __func__, rtd->dai_link->num_codecs, 2841 rtd->dai_link->num_cpus); 2842 return -EINVAL; 2843 } 2844 2845 if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) && 2846 snd_soc_dai_stream_valid(cpu_dai, cpu_playback)) 2847 has_playback = 1; 2848 if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) && 2849 snd_soc_dai_stream_valid(cpu_dai, cpu_capture)) 2850 has_capture = 1; 2851 } 2852 } 2853 2854 if (dai_link->playback_only) 2855 has_capture = 0; 2856 2857 if (dai_link->capture_only) 2858 has_playback = 0; 2859 2860 if (!has_playback && !has_capture) { 2861 dev_err(rtd->dev, "substream %s has no playback, no capture\n", 2862 dai_link->stream_name); 2863 2864 return -EINVAL; 2865 } 2866 2867 *playback = has_playback; 2868 *capture = has_capture; 2869 2870 return 0; 2871 } 2872 2873 static int soc_create_pcm(struct snd_pcm **pcm, 2874 struct snd_soc_pcm_runtime *rtd, 2875 int playback, int capture, int num) 2876 { 2877 char new_name[64]; 2878 int ret; 2879 2880 /* create the PCM */ 2881 if (rtd->dai_link->c2c_params) { 2882 snprintf(new_name, sizeof(new_name), "codec2codec(%s)", 2883 rtd->dai_link->stream_name); 2884 2885 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num, 2886 playback, capture, pcm); 2887 } else if (rtd->dai_link->no_pcm) { 2888 snprintf(new_name, sizeof(new_name), "(%s)", 2889 rtd->dai_link->stream_name); 2890 2891 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num, 2892 playback, capture, pcm); 2893 } else { 2894 if (rtd->dai_link->dynamic) 2895 snprintf(new_name, sizeof(new_name), "%s (*)", 2896 rtd->dai_link->stream_name); 2897 else 2898 snprintf(new_name, sizeof(new_name), "%s %s-%d", 2899 rtd->dai_link->stream_name, 2900 soc_codec_dai_name(rtd), num); 2901 2902 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback, 2903 capture, pcm); 2904 } 2905 if (ret < 0) { 2906 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n", 2907 new_name, rtd->dai_link->name, ret); 2908 return ret; 2909 } 2910 dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name); 2911 2912 return 0; 2913 } 2914 2915 /* create a new pcm */ 2916 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num) 2917 { 2918 struct snd_soc_component *component; 2919 struct snd_pcm *pcm; 2920 int ret = 0, playback = 0, capture = 0; 2921 int i; 2922 2923 ret = soc_get_playback_capture(rtd, &playback, &capture); 2924 if (ret < 0) 2925 return ret; 2926 2927 ret = soc_create_pcm(&pcm, rtd, playback, capture, num); 2928 if (ret < 0) 2929 return ret; 2930 2931 /* DAPM dai link stream work */ 2932 /* 2933 * Currently nothing to do for c2c links 2934 * Since c2c links are internal nodes in the DAPM graph and 2935 * don't interface with the outside world or application layer 2936 * we don't have to do any special handling on close. 2937 */ 2938 if (!rtd->dai_link->c2c_params) 2939 rtd->close_delayed_work_func = snd_soc_close_delayed_work; 2940 2941 rtd->pcm = pcm; 2942 pcm->nonatomic = rtd->dai_link->nonatomic; 2943 pcm->private_data = rtd; 2944 pcm->no_device_suspend = true; 2945 2946 if (rtd->dai_link->no_pcm || rtd->dai_link->c2c_params) { 2947 if (playback) 2948 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd; 2949 if (capture) 2950 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd; 2951 goto out; 2952 } 2953 2954 /* ASoC PCM operations */ 2955 if (rtd->dai_link->dynamic) { 2956 rtd->ops.open = dpcm_fe_dai_open; 2957 rtd->ops.hw_params = dpcm_fe_dai_hw_params; 2958 rtd->ops.prepare = dpcm_fe_dai_prepare; 2959 rtd->ops.trigger = dpcm_fe_dai_trigger; 2960 rtd->ops.hw_free = dpcm_fe_dai_hw_free; 2961 rtd->ops.close = dpcm_fe_dai_close; 2962 rtd->ops.pointer = soc_pcm_pointer; 2963 } else { 2964 rtd->ops.open = soc_pcm_open; 2965 rtd->ops.hw_params = soc_pcm_hw_params; 2966 rtd->ops.prepare = soc_pcm_prepare; 2967 rtd->ops.trigger = soc_pcm_trigger; 2968 rtd->ops.hw_free = soc_pcm_hw_free; 2969 rtd->ops.close = soc_pcm_close; 2970 rtd->ops.pointer = soc_pcm_pointer; 2971 } 2972 2973 for_each_rtd_components(rtd, i, component) { 2974 const struct snd_soc_component_driver *drv = component->driver; 2975 2976 if (drv->ioctl) 2977 rtd->ops.ioctl = snd_soc_pcm_component_ioctl; 2978 if (drv->sync_stop) 2979 rtd->ops.sync_stop = snd_soc_pcm_component_sync_stop; 2980 if (drv->copy) 2981 rtd->ops.copy = snd_soc_pcm_component_copy; 2982 if (drv->page) 2983 rtd->ops.page = snd_soc_pcm_component_page; 2984 if (drv->mmap) 2985 rtd->ops.mmap = snd_soc_pcm_component_mmap; 2986 if (drv->ack) 2987 rtd->ops.ack = snd_soc_pcm_component_ack; 2988 } 2989 2990 if (playback) 2991 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops); 2992 2993 if (capture) 2994 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops); 2995 2996 ret = snd_soc_pcm_component_new(rtd); 2997 if (ret < 0) 2998 return ret; 2999 out: 3000 dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n", 3001 soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd)); 3002 return ret; 3003 } 3004 3005 /* is the current PCM operation for this FE ? */ 3006 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream) 3007 { 3008 if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) 3009 return 1; 3010 return 0; 3011 } 3012 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update); 3013 3014 /* is the current PCM operation for this BE ? */ 3015 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe, 3016 struct snd_soc_pcm_runtime *be, int stream) 3017 { 3018 if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) || 3019 ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) && 3020 be->dpcm[stream].runtime_update)) 3021 return 1; 3022 return 0; 3023 } 3024 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update); 3025 3026 /* get the substream for this BE */ 3027 struct snd_pcm_substream * 3028 snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream) 3029 { 3030 return be->pcm->streams[stream].substream; 3031 } 3032 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream); 3033 3034 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe, 3035 struct snd_soc_pcm_runtime *be, 3036 int stream, 3037 const enum snd_soc_dpcm_state *states, 3038 int num_states) 3039 { 3040 struct snd_soc_dpcm *dpcm; 3041 int state; 3042 int ret = 1; 3043 int i; 3044 3045 for_each_dpcm_fe(be, stream, dpcm) { 3046 3047 if (dpcm->fe == fe) 3048 continue; 3049 3050 state = dpcm->fe->dpcm[stream].state; 3051 for (i = 0; i < num_states; i++) { 3052 if (state == states[i]) { 3053 ret = 0; 3054 break; 3055 } 3056 } 3057 } 3058 3059 /* it's safe to do this BE DAI */ 3060 return ret; 3061 } 3062 3063 /* 3064 * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE 3065 * are not running, paused or suspended for the specified stream direction. 3066 */ 3067 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe, 3068 struct snd_soc_pcm_runtime *be, int stream) 3069 { 3070 const enum snd_soc_dpcm_state state[] = { 3071 SND_SOC_DPCM_STATE_START, 3072 SND_SOC_DPCM_STATE_PAUSED, 3073 SND_SOC_DPCM_STATE_SUSPEND, 3074 }; 3075 3076 return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state)); 3077 } 3078 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop); 3079 3080 /* 3081 * We can only change hw params a BE DAI if any of it's FE are not prepared, 3082 * running, paused or suspended for the specified stream direction. 3083 */ 3084 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe, 3085 struct snd_soc_pcm_runtime *be, int stream) 3086 { 3087 const enum snd_soc_dpcm_state state[] = { 3088 SND_SOC_DPCM_STATE_START, 3089 SND_SOC_DPCM_STATE_PAUSED, 3090 SND_SOC_DPCM_STATE_SUSPEND, 3091 SND_SOC_DPCM_STATE_PREPARE, 3092 }; 3093 3094 return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state)); 3095 } 3096 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params); 3097 3098 /* 3099 * We can only prepare a BE DAI if any of it's FE are not prepared, 3100 * running or paused for the specified stream direction. 3101 */ 3102 int snd_soc_dpcm_can_be_prepared(struct snd_soc_pcm_runtime *fe, 3103 struct snd_soc_pcm_runtime *be, int stream) 3104 { 3105 const enum snd_soc_dpcm_state state[] = { 3106 SND_SOC_DPCM_STATE_START, 3107 SND_SOC_DPCM_STATE_PAUSED, 3108 SND_SOC_DPCM_STATE_PREPARE, 3109 }; 3110 3111 return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state)); 3112 } 3113 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_prepared); 3114