1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/sched/signal.h> 27 #include <linux/time.h> 28 #include <linux/pm_qos.h> 29 #include <linux/io.h> 30 #include <linux/dma-mapping.h> 31 #include <sound/core.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/timer.h> 37 #include <sound/minors.h> 38 #include <linux/uio.h> 39 40 #include "pcm_local.h" 41 42 #ifdef CONFIG_SND_DEBUG 43 #define CREATE_TRACE_POINTS 44 #include "pcm_param_trace.h" 45 #else 46 #define trace_hw_mask_param_enabled() 0 47 #define trace_hw_interval_param_enabled() 0 48 #define trace_hw_mask_param(substream, type, index, prev, curr) 49 #define trace_hw_interval_param(substream, type, index, prev, curr) 50 #endif 51 52 /* 53 * Compatibility 54 */ 55 56 struct snd_pcm_hw_params_old { 57 unsigned int flags; 58 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 59 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 60 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 61 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 62 unsigned int rmask; 63 unsigned int cmask; 64 unsigned int info; 65 unsigned int msbits; 66 unsigned int rate_num; 67 unsigned int rate_den; 68 snd_pcm_uframes_t fifo_size; 69 unsigned char reserved[64]; 70 }; 71 72 #ifdef CONFIG_SND_SUPPORT_OLD_API 73 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 74 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 75 76 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 77 struct snd_pcm_hw_params_old __user * _oparams); 78 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 79 struct snd_pcm_hw_params_old __user * _oparams); 80 #endif 81 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 82 83 /* 84 * 85 */ 86 87 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 88 static DECLARE_RWSEM(snd_pcm_link_rwsem); 89 90 /* Writer in rwsem may block readers even during its waiting in queue, 91 * and this may lead to a deadlock when the code path takes read sem 92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 94 * spin until it gets the lock. 95 */ 96 static inline void down_write_nonblock(struct rw_semaphore *lock) 97 { 98 while (!down_write_trylock(lock)) 99 cond_resched(); 100 } 101 102 /** 103 * snd_pcm_stream_lock - Lock the PCM stream 104 * @substream: PCM substream 105 * 106 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 107 * flag of the given substream. This also takes the global link rw lock 108 * (or rw sem), too, for avoiding the race with linked streams. 109 */ 110 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 111 { 112 if (substream->pcm->nonatomic) { 113 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 114 mutex_lock(&substream->self_group.mutex); 115 } else { 116 read_lock(&snd_pcm_link_rwlock); 117 spin_lock(&substream->self_group.lock); 118 } 119 } 120 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 121 122 /** 123 * snd_pcm_stream_lock - Unlock the PCM stream 124 * @substream: PCM substream 125 * 126 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 127 */ 128 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 129 { 130 if (substream->pcm->nonatomic) { 131 mutex_unlock(&substream->self_group.mutex); 132 up_read(&snd_pcm_link_rwsem); 133 } else { 134 spin_unlock(&substream->self_group.lock); 135 read_unlock(&snd_pcm_link_rwlock); 136 } 137 } 138 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 139 140 /** 141 * snd_pcm_stream_lock_irq - Lock the PCM stream 142 * @substream: PCM substream 143 * 144 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 145 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 146 * as snd_pcm_stream_lock(). 147 */ 148 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 149 { 150 if (!substream->pcm->nonatomic) 151 local_irq_disable(); 152 snd_pcm_stream_lock(substream); 153 } 154 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 155 156 /** 157 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 158 * @substream: PCM substream 159 * 160 * This is a counter-part of snd_pcm_stream_lock_irq(). 161 */ 162 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 163 { 164 snd_pcm_stream_unlock(substream); 165 if (!substream->pcm->nonatomic) 166 local_irq_enable(); 167 } 168 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 169 170 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 171 { 172 unsigned long flags = 0; 173 if (!substream->pcm->nonatomic) 174 local_irq_save(flags); 175 snd_pcm_stream_lock(substream); 176 return flags; 177 } 178 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 179 180 /** 181 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 182 * @substream: PCM substream 183 * @flags: irq flags 184 * 185 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 186 */ 187 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 188 unsigned long flags) 189 { 190 snd_pcm_stream_unlock(substream); 191 if (!substream->pcm->nonatomic) 192 local_irq_restore(flags); 193 } 194 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 195 196 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 197 { 198 struct snd_pcm_runtime *runtime; 199 struct snd_pcm *pcm = substream->pcm; 200 struct snd_pcm_str *pstr = substream->pstr; 201 202 memset(info, 0, sizeof(*info)); 203 info->card = pcm->card->number; 204 info->device = pcm->device; 205 info->stream = substream->stream; 206 info->subdevice = substream->number; 207 strlcpy(info->id, pcm->id, sizeof(info->id)); 208 strlcpy(info->name, pcm->name, sizeof(info->name)); 209 info->dev_class = pcm->dev_class; 210 info->dev_subclass = pcm->dev_subclass; 211 info->subdevices_count = pstr->substream_count; 212 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 213 strlcpy(info->subname, substream->name, sizeof(info->subname)); 214 runtime = substream->runtime; 215 /* AB: FIXME!!! This is definitely nonsense */ 216 if (runtime) { 217 info->sync = runtime->sync; 218 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 219 } 220 return 0; 221 } 222 223 int snd_pcm_info_user(struct snd_pcm_substream *substream, 224 struct snd_pcm_info __user * _info) 225 { 226 struct snd_pcm_info *info; 227 int err; 228 229 info = kmalloc(sizeof(*info), GFP_KERNEL); 230 if (! info) 231 return -ENOMEM; 232 err = snd_pcm_info(substream, info); 233 if (err >= 0) { 234 if (copy_to_user(_info, info, sizeof(*info))) 235 err = -EFAULT; 236 } 237 kfree(info); 238 return err; 239 } 240 241 static bool hw_support_mmap(struct snd_pcm_substream *substream) 242 { 243 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 244 return false; 245 /* check architectures that return -EINVAL from dma_mmap_coherent() */ 246 /* FIXME: this should be some global flag */ 247 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\ 248 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA) 249 if (!substream->ops->mmap && 250 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 251 return false; 252 #endif 253 return true; 254 } 255 256 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 257 struct snd_pcm_hw_params *params) 258 { 259 unsigned int k; 260 struct snd_pcm_hardware *hw; 261 struct snd_interval *i = NULL; 262 struct snd_mask *m = NULL; 263 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; 264 unsigned int rstamps[constrs->rules_num]; 265 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 266 unsigned int stamp = 2; 267 int changed, again; 268 269 struct snd_mask __maybe_unused old_mask; 270 struct snd_interval __maybe_unused old_interval; 271 272 params->info = 0; 273 params->fifo_size = 0; 274 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 275 params->msbits = 0; 276 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 277 params->rate_num = 0; 278 params->rate_den = 0; 279 } 280 281 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 282 m = hw_param_mask(params, k); 283 if (snd_mask_empty(m)) 284 return -EINVAL; 285 if (!(params->rmask & (1 << k))) 286 continue; 287 288 if (trace_hw_mask_param_enabled()) 289 old_mask = *m; 290 291 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 292 293 trace_hw_mask_param(substream, k, 0, &old_mask, m); 294 295 if (changed) 296 params->cmask |= 1 << k; 297 if (changed < 0) 298 return changed; 299 } 300 301 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 302 i = hw_param_interval(params, k); 303 if (snd_interval_empty(i)) 304 return -EINVAL; 305 if (!(params->rmask & (1 << k))) 306 continue; 307 308 if (trace_hw_interval_param_enabled()) 309 old_interval = *i; 310 311 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 312 313 trace_hw_interval_param(substream, k, 0, &old_interval, i); 314 315 if (changed) 316 params->cmask |= 1 << k; 317 if (changed < 0) 318 return changed; 319 } 320 321 for (k = 0; k < constrs->rules_num; k++) 322 rstamps[k] = 0; 323 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 324 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 325 do { 326 again = 0; 327 for (k = 0; k < constrs->rules_num; k++) { 328 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 329 unsigned int d; 330 int doit = 0; 331 if (r->cond && !(r->cond & params->flags)) 332 continue; 333 for (d = 0; r->deps[d] >= 0; d++) { 334 if (vstamps[r->deps[d]] > rstamps[k]) { 335 doit = 1; 336 break; 337 } 338 } 339 if (!doit) 340 continue; 341 342 if (trace_hw_mask_param_enabled()) { 343 if (hw_is_mask(r->var)) 344 old_mask = *hw_param_mask(params, r->var); 345 } 346 if (trace_hw_interval_param_enabled()) { 347 if (hw_is_interval(r->var)) 348 old_interval = *hw_param_interval(params, r->var); 349 } 350 351 changed = r->func(params, r); 352 353 if (hw_is_mask(r->var)) { 354 trace_hw_mask_param(substream, r->var, k + 1, 355 &old_mask, hw_param_mask(params, r->var)); 356 } 357 if (hw_is_interval(r->var)) { 358 trace_hw_interval_param(substream, r->var, k + 1, 359 &old_interval, hw_param_interval(params, r->var)); 360 } 361 362 rstamps[k] = stamp; 363 if (changed && r->var >= 0) { 364 params->cmask |= (1 << r->var); 365 vstamps[r->var] = stamp; 366 again = 1; 367 } 368 if (changed < 0) 369 return changed; 370 stamp++; 371 } 372 } while (again); 373 if (!params->msbits) { 374 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 375 if (snd_interval_single(i)) 376 params->msbits = snd_interval_value(i); 377 } 378 379 if (!params->rate_den) { 380 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 381 if (snd_interval_single(i)) { 382 params->rate_num = snd_interval_value(i); 383 params->rate_den = 1; 384 } 385 } 386 387 hw = &substream->runtime->hw; 388 if (!params->info) { 389 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 390 SNDRV_PCM_INFO_DRAIN_TRIGGER); 391 if (!hw_support_mmap(substream)) 392 params->info &= ~(SNDRV_PCM_INFO_MMAP | 393 SNDRV_PCM_INFO_MMAP_VALID); 394 } 395 if (!params->fifo_size) { 396 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 397 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 398 if (snd_mask_min(m) == snd_mask_max(m) && 399 snd_interval_min(i) == snd_interval_max(i)) { 400 changed = substream->ops->ioctl(substream, 401 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 402 if (changed < 0) 403 return changed; 404 } 405 } 406 params->rmask = 0; 407 return 0; 408 } 409 410 EXPORT_SYMBOL(snd_pcm_hw_refine); 411 412 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 413 struct snd_pcm_hw_params __user * _params) 414 { 415 struct snd_pcm_hw_params *params; 416 int err; 417 418 params = memdup_user(_params, sizeof(*params)); 419 if (IS_ERR(params)) 420 return PTR_ERR(params); 421 422 err = snd_pcm_hw_refine(substream, params); 423 if (copy_to_user(_params, params, sizeof(*params))) { 424 if (!err) 425 err = -EFAULT; 426 } 427 428 kfree(params); 429 return err; 430 } 431 432 static int period_to_usecs(struct snd_pcm_runtime *runtime) 433 { 434 int usecs; 435 436 if (! runtime->rate) 437 return -1; /* invalid */ 438 439 /* take 75% of period time as the deadline */ 440 usecs = (750000 / runtime->rate) * runtime->period_size; 441 usecs += ((750000 % runtime->rate) * runtime->period_size) / 442 runtime->rate; 443 444 return usecs; 445 } 446 447 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 448 { 449 snd_pcm_stream_lock_irq(substream); 450 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 451 substream->runtime->status->state = state; 452 snd_pcm_stream_unlock_irq(substream); 453 } 454 455 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 456 int event) 457 { 458 #ifdef CONFIG_SND_PCM_TIMER 459 if (substream->timer) 460 snd_timer_notify(substream->timer, event, 461 &substream->runtime->trigger_tstamp); 462 #endif 463 } 464 465 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 466 struct snd_pcm_hw_params *params) 467 { 468 struct snd_pcm_runtime *runtime; 469 int err, usecs; 470 unsigned int bits; 471 snd_pcm_uframes_t frames; 472 473 if (PCM_RUNTIME_CHECK(substream)) 474 return -ENXIO; 475 runtime = substream->runtime; 476 snd_pcm_stream_lock_irq(substream); 477 switch (runtime->status->state) { 478 case SNDRV_PCM_STATE_OPEN: 479 case SNDRV_PCM_STATE_SETUP: 480 case SNDRV_PCM_STATE_PREPARED: 481 break; 482 default: 483 snd_pcm_stream_unlock_irq(substream); 484 return -EBADFD; 485 } 486 snd_pcm_stream_unlock_irq(substream); 487 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 488 if (!substream->oss.oss) 489 #endif 490 if (atomic_read(&substream->mmap_count)) 491 return -EBADFD; 492 493 params->rmask = ~0U; 494 err = snd_pcm_hw_refine(substream, params); 495 if (err < 0) 496 goto _error; 497 498 err = snd_pcm_hw_params_choose(substream, params); 499 if (err < 0) 500 goto _error; 501 502 if (substream->ops->hw_params != NULL) { 503 err = substream->ops->hw_params(substream, params); 504 if (err < 0) 505 goto _error; 506 } 507 508 runtime->access = params_access(params); 509 runtime->format = params_format(params); 510 runtime->subformat = params_subformat(params); 511 runtime->channels = params_channels(params); 512 runtime->rate = params_rate(params); 513 runtime->period_size = params_period_size(params); 514 runtime->periods = params_periods(params); 515 runtime->buffer_size = params_buffer_size(params); 516 runtime->info = params->info; 517 runtime->rate_num = params->rate_num; 518 runtime->rate_den = params->rate_den; 519 runtime->no_period_wakeup = 520 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 521 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 522 523 bits = snd_pcm_format_physical_width(runtime->format); 524 runtime->sample_bits = bits; 525 bits *= runtime->channels; 526 runtime->frame_bits = bits; 527 frames = 1; 528 while (bits % 8 != 0) { 529 bits *= 2; 530 frames *= 2; 531 } 532 runtime->byte_align = bits / 8; 533 runtime->min_align = frames; 534 535 /* Default sw params */ 536 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 537 runtime->period_step = 1; 538 runtime->control->avail_min = runtime->period_size; 539 runtime->start_threshold = 1; 540 runtime->stop_threshold = runtime->buffer_size; 541 runtime->silence_threshold = 0; 542 runtime->silence_size = 0; 543 runtime->boundary = runtime->buffer_size; 544 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 545 runtime->boundary *= 2; 546 547 snd_pcm_timer_resolution_change(substream); 548 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 549 550 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 551 pm_qos_remove_request(&substream->latency_pm_qos_req); 552 if ((usecs = period_to_usecs(runtime)) >= 0) 553 pm_qos_add_request(&substream->latency_pm_qos_req, 554 PM_QOS_CPU_DMA_LATENCY, usecs); 555 return 0; 556 _error: 557 /* hardware might be unusable from this time, 558 so we force application to retry to set 559 the correct hardware parameter settings */ 560 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 561 if (substream->ops->hw_free != NULL) 562 substream->ops->hw_free(substream); 563 return err; 564 } 565 566 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 567 struct snd_pcm_hw_params __user * _params) 568 { 569 struct snd_pcm_hw_params *params; 570 int err; 571 572 params = memdup_user(_params, sizeof(*params)); 573 if (IS_ERR(params)) 574 return PTR_ERR(params); 575 576 err = snd_pcm_hw_params(substream, params); 577 if (copy_to_user(_params, params, sizeof(*params))) { 578 if (!err) 579 err = -EFAULT; 580 } 581 582 kfree(params); 583 return err; 584 } 585 586 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 587 { 588 struct snd_pcm_runtime *runtime; 589 int result = 0; 590 591 if (PCM_RUNTIME_CHECK(substream)) 592 return -ENXIO; 593 runtime = substream->runtime; 594 snd_pcm_stream_lock_irq(substream); 595 switch (runtime->status->state) { 596 case SNDRV_PCM_STATE_SETUP: 597 case SNDRV_PCM_STATE_PREPARED: 598 break; 599 default: 600 snd_pcm_stream_unlock_irq(substream); 601 return -EBADFD; 602 } 603 snd_pcm_stream_unlock_irq(substream); 604 if (atomic_read(&substream->mmap_count)) 605 return -EBADFD; 606 if (substream->ops->hw_free) 607 result = substream->ops->hw_free(substream); 608 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 609 pm_qos_remove_request(&substream->latency_pm_qos_req); 610 return result; 611 } 612 613 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 614 struct snd_pcm_sw_params *params) 615 { 616 struct snd_pcm_runtime *runtime; 617 int err; 618 619 if (PCM_RUNTIME_CHECK(substream)) 620 return -ENXIO; 621 runtime = substream->runtime; 622 snd_pcm_stream_lock_irq(substream); 623 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 624 snd_pcm_stream_unlock_irq(substream); 625 return -EBADFD; 626 } 627 snd_pcm_stream_unlock_irq(substream); 628 629 if (params->tstamp_mode < 0 || 630 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 631 return -EINVAL; 632 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 633 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 634 return -EINVAL; 635 if (params->avail_min == 0) 636 return -EINVAL; 637 if (params->silence_size >= runtime->boundary) { 638 if (params->silence_threshold != 0) 639 return -EINVAL; 640 } else { 641 if (params->silence_size > params->silence_threshold) 642 return -EINVAL; 643 if (params->silence_threshold > runtime->buffer_size) 644 return -EINVAL; 645 } 646 err = 0; 647 snd_pcm_stream_lock_irq(substream); 648 runtime->tstamp_mode = params->tstamp_mode; 649 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 650 runtime->tstamp_type = params->tstamp_type; 651 runtime->period_step = params->period_step; 652 runtime->control->avail_min = params->avail_min; 653 runtime->start_threshold = params->start_threshold; 654 runtime->stop_threshold = params->stop_threshold; 655 runtime->silence_threshold = params->silence_threshold; 656 runtime->silence_size = params->silence_size; 657 params->boundary = runtime->boundary; 658 if (snd_pcm_running(substream)) { 659 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 660 runtime->silence_size > 0) 661 snd_pcm_playback_silence(substream, ULONG_MAX); 662 err = snd_pcm_update_state(substream, runtime); 663 } 664 snd_pcm_stream_unlock_irq(substream); 665 return err; 666 } 667 668 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 669 struct snd_pcm_sw_params __user * _params) 670 { 671 struct snd_pcm_sw_params params; 672 int err; 673 if (copy_from_user(¶ms, _params, sizeof(params))) 674 return -EFAULT; 675 err = snd_pcm_sw_params(substream, ¶ms); 676 if (copy_to_user(_params, ¶ms, sizeof(params))) 677 return -EFAULT; 678 return err; 679 } 680 681 int snd_pcm_status(struct snd_pcm_substream *substream, 682 struct snd_pcm_status *status) 683 { 684 struct snd_pcm_runtime *runtime = substream->runtime; 685 686 snd_pcm_stream_lock_irq(substream); 687 688 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 689 &runtime->audio_tstamp_config); 690 691 /* backwards compatible behavior */ 692 if (runtime->audio_tstamp_config.type_requested == 693 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 694 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 695 runtime->audio_tstamp_config.type_requested = 696 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 697 else 698 runtime->audio_tstamp_config.type_requested = 699 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 700 runtime->audio_tstamp_report.valid = 0; 701 } else 702 runtime->audio_tstamp_report.valid = 1; 703 704 status->state = runtime->status->state; 705 status->suspended_state = runtime->status->suspended_state; 706 if (status->state == SNDRV_PCM_STATE_OPEN) 707 goto _end; 708 status->trigger_tstamp = runtime->trigger_tstamp; 709 if (snd_pcm_running(substream)) { 710 snd_pcm_update_hw_ptr(substream); 711 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 712 status->tstamp = runtime->status->tstamp; 713 status->driver_tstamp = runtime->driver_tstamp; 714 status->audio_tstamp = 715 runtime->status->audio_tstamp; 716 if (runtime->audio_tstamp_report.valid == 1) 717 /* backwards compatibility, no report provided in COMPAT mode */ 718 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 719 &status->audio_tstamp_accuracy, 720 &runtime->audio_tstamp_report); 721 722 goto _tstamp_end; 723 } 724 } else { 725 /* get tstamp only in fallback mode and only if enabled */ 726 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 727 snd_pcm_gettime(runtime, &status->tstamp); 728 } 729 _tstamp_end: 730 status->appl_ptr = runtime->control->appl_ptr; 731 status->hw_ptr = runtime->status->hw_ptr; 732 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 733 status->avail = snd_pcm_playback_avail(runtime); 734 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 735 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 736 status->delay = runtime->buffer_size - status->avail; 737 status->delay += runtime->delay; 738 } else 739 status->delay = 0; 740 } else { 741 status->avail = snd_pcm_capture_avail(runtime); 742 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 743 status->delay = status->avail + runtime->delay; 744 else 745 status->delay = 0; 746 } 747 status->avail_max = runtime->avail_max; 748 status->overrange = runtime->overrange; 749 runtime->avail_max = 0; 750 runtime->overrange = 0; 751 _end: 752 snd_pcm_stream_unlock_irq(substream); 753 return 0; 754 } 755 756 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 757 struct snd_pcm_status __user * _status, 758 bool ext) 759 { 760 struct snd_pcm_status status; 761 int res; 762 763 memset(&status, 0, sizeof(status)); 764 /* 765 * with extension, parameters are read/write, 766 * get audio_tstamp_data from user, 767 * ignore rest of status structure 768 */ 769 if (ext && get_user(status.audio_tstamp_data, 770 (u32 __user *)(&_status->audio_tstamp_data))) 771 return -EFAULT; 772 res = snd_pcm_status(substream, &status); 773 if (res < 0) 774 return res; 775 if (copy_to_user(_status, &status, sizeof(status))) 776 return -EFAULT; 777 return 0; 778 } 779 780 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 781 struct snd_pcm_channel_info * info) 782 { 783 struct snd_pcm_runtime *runtime; 784 unsigned int channel; 785 786 channel = info->channel; 787 runtime = substream->runtime; 788 snd_pcm_stream_lock_irq(substream); 789 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 790 snd_pcm_stream_unlock_irq(substream); 791 return -EBADFD; 792 } 793 snd_pcm_stream_unlock_irq(substream); 794 if (channel >= runtime->channels) 795 return -EINVAL; 796 memset(info, 0, sizeof(*info)); 797 info->channel = channel; 798 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 799 } 800 801 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 802 struct snd_pcm_channel_info __user * _info) 803 { 804 struct snd_pcm_channel_info info; 805 int res; 806 807 if (copy_from_user(&info, _info, sizeof(info))) 808 return -EFAULT; 809 res = snd_pcm_channel_info(substream, &info); 810 if (res < 0) 811 return res; 812 if (copy_to_user(_info, &info, sizeof(info))) 813 return -EFAULT; 814 return 0; 815 } 816 817 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 818 { 819 struct snd_pcm_runtime *runtime = substream->runtime; 820 if (runtime->trigger_master == NULL) 821 return; 822 if (runtime->trigger_master == substream) { 823 if (!runtime->trigger_tstamp_latched) 824 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 825 } else { 826 snd_pcm_trigger_tstamp(runtime->trigger_master); 827 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 828 } 829 runtime->trigger_master = NULL; 830 } 831 832 struct action_ops { 833 int (*pre_action)(struct snd_pcm_substream *substream, int state); 834 int (*do_action)(struct snd_pcm_substream *substream, int state); 835 void (*undo_action)(struct snd_pcm_substream *substream, int state); 836 void (*post_action)(struct snd_pcm_substream *substream, int state); 837 }; 838 839 /* 840 * this functions is core for handling of linked stream 841 * Note: the stream state might be changed also on failure 842 * Note2: call with calling stream lock + link lock 843 */ 844 static int snd_pcm_action_group(const struct action_ops *ops, 845 struct snd_pcm_substream *substream, 846 int state, int do_lock) 847 { 848 struct snd_pcm_substream *s = NULL; 849 struct snd_pcm_substream *s1; 850 int res = 0, depth = 1; 851 852 snd_pcm_group_for_each_entry(s, substream) { 853 if (do_lock && s != substream) { 854 if (s->pcm->nonatomic) 855 mutex_lock_nested(&s->self_group.mutex, depth); 856 else 857 spin_lock_nested(&s->self_group.lock, depth); 858 depth++; 859 } 860 res = ops->pre_action(s, state); 861 if (res < 0) 862 goto _unlock; 863 } 864 snd_pcm_group_for_each_entry(s, substream) { 865 res = ops->do_action(s, state); 866 if (res < 0) { 867 if (ops->undo_action) { 868 snd_pcm_group_for_each_entry(s1, substream) { 869 if (s1 == s) /* failed stream */ 870 break; 871 ops->undo_action(s1, state); 872 } 873 } 874 s = NULL; /* unlock all */ 875 goto _unlock; 876 } 877 } 878 snd_pcm_group_for_each_entry(s, substream) { 879 ops->post_action(s, state); 880 } 881 _unlock: 882 if (do_lock) { 883 /* unlock streams */ 884 snd_pcm_group_for_each_entry(s1, substream) { 885 if (s1 != substream) { 886 if (s1->pcm->nonatomic) 887 mutex_unlock(&s1->self_group.mutex); 888 else 889 spin_unlock(&s1->self_group.lock); 890 } 891 if (s1 == s) /* end */ 892 break; 893 } 894 } 895 return res; 896 } 897 898 /* 899 * Note: call with stream lock 900 */ 901 static int snd_pcm_action_single(const struct action_ops *ops, 902 struct snd_pcm_substream *substream, 903 int state) 904 { 905 int res; 906 907 res = ops->pre_action(substream, state); 908 if (res < 0) 909 return res; 910 res = ops->do_action(substream, state); 911 if (res == 0) 912 ops->post_action(substream, state); 913 else if (ops->undo_action) 914 ops->undo_action(substream, state); 915 return res; 916 } 917 918 /* 919 * Note: call with stream lock 920 */ 921 static int snd_pcm_action(const struct action_ops *ops, 922 struct snd_pcm_substream *substream, 923 int state) 924 { 925 int res; 926 927 if (!snd_pcm_stream_linked(substream)) 928 return snd_pcm_action_single(ops, substream, state); 929 930 if (substream->pcm->nonatomic) { 931 if (!mutex_trylock(&substream->group->mutex)) { 932 mutex_unlock(&substream->self_group.mutex); 933 mutex_lock(&substream->group->mutex); 934 mutex_lock(&substream->self_group.mutex); 935 } 936 res = snd_pcm_action_group(ops, substream, state, 1); 937 mutex_unlock(&substream->group->mutex); 938 } else { 939 if (!spin_trylock(&substream->group->lock)) { 940 spin_unlock(&substream->self_group.lock); 941 spin_lock(&substream->group->lock); 942 spin_lock(&substream->self_group.lock); 943 } 944 res = snd_pcm_action_group(ops, substream, state, 1); 945 spin_unlock(&substream->group->lock); 946 } 947 return res; 948 } 949 950 /* 951 * Note: don't use any locks before 952 */ 953 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 954 struct snd_pcm_substream *substream, 955 int state) 956 { 957 int res; 958 959 snd_pcm_stream_lock_irq(substream); 960 res = snd_pcm_action(ops, substream, state); 961 snd_pcm_stream_unlock_irq(substream); 962 return res; 963 } 964 965 /* 966 */ 967 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 968 struct snd_pcm_substream *substream, 969 int state) 970 { 971 int res; 972 973 down_read(&snd_pcm_link_rwsem); 974 if (snd_pcm_stream_linked(substream)) 975 res = snd_pcm_action_group(ops, substream, state, 0); 976 else 977 res = snd_pcm_action_single(ops, substream, state); 978 up_read(&snd_pcm_link_rwsem); 979 return res; 980 } 981 982 /* 983 * start callbacks 984 */ 985 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 986 { 987 struct snd_pcm_runtime *runtime = substream->runtime; 988 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 989 return -EBADFD; 990 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 991 !snd_pcm_playback_data(substream)) 992 return -EPIPE; 993 runtime->trigger_tstamp_latched = false; 994 runtime->trigger_master = substream; 995 return 0; 996 } 997 998 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 999 { 1000 if (substream->runtime->trigger_master != substream) 1001 return 0; 1002 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1003 } 1004 1005 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1006 { 1007 if (substream->runtime->trigger_master == substream) 1008 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1009 } 1010 1011 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1012 { 1013 struct snd_pcm_runtime *runtime = substream->runtime; 1014 snd_pcm_trigger_tstamp(substream); 1015 runtime->hw_ptr_jiffies = jiffies; 1016 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1017 runtime->rate; 1018 runtime->status->state = state; 1019 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1020 runtime->silence_size > 0) 1021 snd_pcm_playback_silence(substream, ULONG_MAX); 1022 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1023 } 1024 1025 static const struct action_ops snd_pcm_action_start = { 1026 .pre_action = snd_pcm_pre_start, 1027 .do_action = snd_pcm_do_start, 1028 .undo_action = snd_pcm_undo_start, 1029 .post_action = snd_pcm_post_start 1030 }; 1031 1032 /** 1033 * snd_pcm_start - start all linked streams 1034 * @substream: the PCM substream instance 1035 * 1036 * Return: Zero if successful, or a negative error code. 1037 * The stream lock must be acquired before calling this function. 1038 */ 1039 int snd_pcm_start(struct snd_pcm_substream *substream) 1040 { 1041 return snd_pcm_action(&snd_pcm_action_start, substream, 1042 SNDRV_PCM_STATE_RUNNING); 1043 } 1044 1045 /* take the stream lock and start the streams */ 1046 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1047 { 1048 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1049 SNDRV_PCM_STATE_RUNNING); 1050 } 1051 1052 /* 1053 * stop callbacks 1054 */ 1055 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1056 { 1057 struct snd_pcm_runtime *runtime = substream->runtime; 1058 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1059 return -EBADFD; 1060 runtime->trigger_master = substream; 1061 return 0; 1062 } 1063 1064 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1065 { 1066 if (substream->runtime->trigger_master == substream && 1067 snd_pcm_running(substream)) 1068 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1069 return 0; /* unconditonally stop all substreams */ 1070 } 1071 1072 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1073 { 1074 struct snd_pcm_runtime *runtime = substream->runtime; 1075 if (runtime->status->state != state) { 1076 snd_pcm_trigger_tstamp(substream); 1077 runtime->status->state = state; 1078 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1079 } 1080 wake_up(&runtime->sleep); 1081 wake_up(&runtime->tsleep); 1082 } 1083 1084 static const struct action_ops snd_pcm_action_stop = { 1085 .pre_action = snd_pcm_pre_stop, 1086 .do_action = snd_pcm_do_stop, 1087 .post_action = snd_pcm_post_stop 1088 }; 1089 1090 /** 1091 * snd_pcm_stop - try to stop all running streams in the substream group 1092 * @substream: the PCM substream instance 1093 * @state: PCM state after stopping the stream 1094 * 1095 * The state of each stream is then changed to the given state unconditionally. 1096 * 1097 * Return: Zero if successful, or a negative error code. 1098 */ 1099 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1100 { 1101 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1102 } 1103 1104 EXPORT_SYMBOL(snd_pcm_stop); 1105 1106 /** 1107 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1108 * @substream: the PCM substream 1109 * 1110 * After stopping, the state is changed to SETUP. 1111 * Unlike snd_pcm_stop(), this affects only the given stream. 1112 * 1113 * Return: Zero if succesful, or a negative error code. 1114 */ 1115 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1116 { 1117 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1118 SNDRV_PCM_STATE_SETUP); 1119 } 1120 1121 /** 1122 * snd_pcm_stop_xrun - stop the running streams as XRUN 1123 * @substream: the PCM substream instance 1124 * 1125 * This stops the given running substream (and all linked substreams) as XRUN. 1126 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1127 * 1128 * Return: Zero if successful, or a negative error code. 1129 */ 1130 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1131 { 1132 unsigned long flags; 1133 int ret = 0; 1134 1135 snd_pcm_stream_lock_irqsave(substream, flags); 1136 if (snd_pcm_running(substream)) 1137 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1138 snd_pcm_stream_unlock_irqrestore(substream, flags); 1139 return ret; 1140 } 1141 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1142 1143 /* 1144 * pause callbacks 1145 */ 1146 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1147 { 1148 struct snd_pcm_runtime *runtime = substream->runtime; 1149 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1150 return -ENOSYS; 1151 if (push) { 1152 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1153 return -EBADFD; 1154 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1155 return -EBADFD; 1156 runtime->trigger_master = substream; 1157 return 0; 1158 } 1159 1160 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1161 { 1162 if (substream->runtime->trigger_master != substream) 1163 return 0; 1164 /* some drivers might use hw_ptr to recover from the pause - 1165 update the hw_ptr now */ 1166 if (push) 1167 snd_pcm_update_hw_ptr(substream); 1168 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1169 * a delta between the current jiffies, this gives a large enough 1170 * delta, effectively to skip the check once. 1171 */ 1172 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1173 return substream->ops->trigger(substream, 1174 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1175 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1176 } 1177 1178 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1179 { 1180 if (substream->runtime->trigger_master == substream) 1181 substream->ops->trigger(substream, 1182 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1183 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1184 } 1185 1186 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1187 { 1188 struct snd_pcm_runtime *runtime = substream->runtime; 1189 snd_pcm_trigger_tstamp(substream); 1190 if (push) { 1191 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1192 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1193 wake_up(&runtime->sleep); 1194 wake_up(&runtime->tsleep); 1195 } else { 1196 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1197 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1198 } 1199 } 1200 1201 static const struct action_ops snd_pcm_action_pause = { 1202 .pre_action = snd_pcm_pre_pause, 1203 .do_action = snd_pcm_do_pause, 1204 .undo_action = snd_pcm_undo_pause, 1205 .post_action = snd_pcm_post_pause 1206 }; 1207 1208 /* 1209 * Push/release the pause for all linked streams. 1210 */ 1211 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1212 { 1213 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1214 } 1215 1216 #ifdef CONFIG_PM 1217 /* suspend */ 1218 1219 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1220 { 1221 struct snd_pcm_runtime *runtime = substream->runtime; 1222 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1223 return -EBUSY; 1224 runtime->trigger_master = substream; 1225 return 0; 1226 } 1227 1228 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1229 { 1230 struct snd_pcm_runtime *runtime = substream->runtime; 1231 if (runtime->trigger_master != substream) 1232 return 0; 1233 if (! snd_pcm_running(substream)) 1234 return 0; 1235 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1236 return 0; /* suspend unconditionally */ 1237 } 1238 1239 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1240 { 1241 struct snd_pcm_runtime *runtime = substream->runtime; 1242 snd_pcm_trigger_tstamp(substream); 1243 runtime->status->suspended_state = runtime->status->state; 1244 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1245 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1246 wake_up(&runtime->sleep); 1247 wake_up(&runtime->tsleep); 1248 } 1249 1250 static const struct action_ops snd_pcm_action_suspend = { 1251 .pre_action = snd_pcm_pre_suspend, 1252 .do_action = snd_pcm_do_suspend, 1253 .post_action = snd_pcm_post_suspend 1254 }; 1255 1256 /** 1257 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1258 * @substream: the PCM substream 1259 * 1260 * After this call, all streams are changed to SUSPENDED state. 1261 * 1262 * Return: Zero if successful (or @substream is %NULL), or a negative error 1263 * code. 1264 */ 1265 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1266 { 1267 int err; 1268 unsigned long flags; 1269 1270 if (! substream) 1271 return 0; 1272 1273 snd_pcm_stream_lock_irqsave(substream, flags); 1274 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1275 snd_pcm_stream_unlock_irqrestore(substream, flags); 1276 return err; 1277 } 1278 1279 EXPORT_SYMBOL(snd_pcm_suspend); 1280 1281 /** 1282 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1283 * @pcm: the PCM instance 1284 * 1285 * After this call, all streams are changed to SUSPENDED state. 1286 * 1287 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1288 */ 1289 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1290 { 1291 struct snd_pcm_substream *substream; 1292 int stream, err = 0; 1293 1294 if (! pcm) 1295 return 0; 1296 1297 for (stream = 0; stream < 2; stream++) { 1298 for (substream = pcm->streams[stream].substream; 1299 substream; substream = substream->next) { 1300 /* FIXME: the open/close code should lock this as well */ 1301 if (substream->runtime == NULL) 1302 continue; 1303 err = snd_pcm_suspend(substream); 1304 if (err < 0 && err != -EBUSY) 1305 return err; 1306 } 1307 } 1308 return 0; 1309 } 1310 1311 EXPORT_SYMBOL(snd_pcm_suspend_all); 1312 1313 /* resume */ 1314 1315 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1316 { 1317 struct snd_pcm_runtime *runtime = substream->runtime; 1318 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1319 return -ENOSYS; 1320 runtime->trigger_master = substream; 1321 return 0; 1322 } 1323 1324 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1325 { 1326 struct snd_pcm_runtime *runtime = substream->runtime; 1327 if (runtime->trigger_master != substream) 1328 return 0; 1329 /* DMA not running previously? */ 1330 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1331 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1332 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1333 return 0; 1334 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1335 } 1336 1337 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1338 { 1339 if (substream->runtime->trigger_master == substream && 1340 snd_pcm_running(substream)) 1341 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1342 } 1343 1344 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1345 { 1346 struct snd_pcm_runtime *runtime = substream->runtime; 1347 snd_pcm_trigger_tstamp(substream); 1348 runtime->status->state = runtime->status->suspended_state; 1349 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1350 } 1351 1352 static const struct action_ops snd_pcm_action_resume = { 1353 .pre_action = snd_pcm_pre_resume, 1354 .do_action = snd_pcm_do_resume, 1355 .undo_action = snd_pcm_undo_resume, 1356 .post_action = snd_pcm_post_resume 1357 }; 1358 1359 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1360 { 1361 struct snd_card *card = substream->pcm->card; 1362 int res; 1363 1364 snd_power_lock(card); 1365 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1366 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1367 snd_power_unlock(card); 1368 return res; 1369 } 1370 1371 #else 1372 1373 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1374 { 1375 return -ENOSYS; 1376 } 1377 1378 #endif /* CONFIG_PM */ 1379 1380 /* 1381 * xrun ioctl 1382 * 1383 * Change the RUNNING stream(s) to XRUN state. 1384 */ 1385 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1386 { 1387 struct snd_card *card = substream->pcm->card; 1388 struct snd_pcm_runtime *runtime = substream->runtime; 1389 int result; 1390 1391 snd_power_lock(card); 1392 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1393 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1394 if (result < 0) 1395 goto _unlock; 1396 } 1397 1398 snd_pcm_stream_lock_irq(substream); 1399 switch (runtime->status->state) { 1400 case SNDRV_PCM_STATE_XRUN: 1401 result = 0; /* already there */ 1402 break; 1403 case SNDRV_PCM_STATE_RUNNING: 1404 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1405 break; 1406 default: 1407 result = -EBADFD; 1408 } 1409 snd_pcm_stream_unlock_irq(substream); 1410 _unlock: 1411 snd_power_unlock(card); 1412 return result; 1413 } 1414 1415 /* 1416 * reset ioctl 1417 */ 1418 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1419 { 1420 struct snd_pcm_runtime *runtime = substream->runtime; 1421 switch (runtime->status->state) { 1422 case SNDRV_PCM_STATE_RUNNING: 1423 case SNDRV_PCM_STATE_PREPARED: 1424 case SNDRV_PCM_STATE_PAUSED: 1425 case SNDRV_PCM_STATE_SUSPENDED: 1426 return 0; 1427 default: 1428 return -EBADFD; 1429 } 1430 } 1431 1432 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1433 { 1434 struct snd_pcm_runtime *runtime = substream->runtime; 1435 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1436 if (err < 0) 1437 return err; 1438 runtime->hw_ptr_base = 0; 1439 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1440 runtime->status->hw_ptr % runtime->period_size; 1441 runtime->silence_start = runtime->status->hw_ptr; 1442 runtime->silence_filled = 0; 1443 return 0; 1444 } 1445 1446 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1447 { 1448 struct snd_pcm_runtime *runtime = substream->runtime; 1449 runtime->control->appl_ptr = runtime->status->hw_ptr; 1450 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1451 runtime->silence_size > 0) 1452 snd_pcm_playback_silence(substream, ULONG_MAX); 1453 } 1454 1455 static const struct action_ops snd_pcm_action_reset = { 1456 .pre_action = snd_pcm_pre_reset, 1457 .do_action = snd_pcm_do_reset, 1458 .post_action = snd_pcm_post_reset 1459 }; 1460 1461 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1462 { 1463 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1464 } 1465 1466 /* 1467 * prepare ioctl 1468 */ 1469 /* we use the second argument for updating f_flags */ 1470 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1471 int f_flags) 1472 { 1473 struct snd_pcm_runtime *runtime = substream->runtime; 1474 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1475 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1476 return -EBADFD; 1477 if (snd_pcm_running(substream)) 1478 return -EBUSY; 1479 substream->f_flags = f_flags; 1480 return 0; 1481 } 1482 1483 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1484 { 1485 int err; 1486 err = substream->ops->prepare(substream); 1487 if (err < 0) 1488 return err; 1489 return snd_pcm_do_reset(substream, 0); 1490 } 1491 1492 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1493 { 1494 struct snd_pcm_runtime *runtime = substream->runtime; 1495 runtime->control->appl_ptr = runtime->status->hw_ptr; 1496 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1497 } 1498 1499 static const struct action_ops snd_pcm_action_prepare = { 1500 .pre_action = snd_pcm_pre_prepare, 1501 .do_action = snd_pcm_do_prepare, 1502 .post_action = snd_pcm_post_prepare 1503 }; 1504 1505 /** 1506 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1507 * @substream: the PCM substream instance 1508 * @file: file to refer f_flags 1509 * 1510 * Return: Zero if successful, or a negative error code. 1511 */ 1512 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1513 struct file *file) 1514 { 1515 int res; 1516 struct snd_card *card = substream->pcm->card; 1517 int f_flags; 1518 1519 if (file) 1520 f_flags = file->f_flags; 1521 else 1522 f_flags = substream->f_flags; 1523 1524 snd_power_lock(card); 1525 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1526 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1527 substream, f_flags); 1528 snd_power_unlock(card); 1529 return res; 1530 } 1531 1532 /* 1533 * drain ioctl 1534 */ 1535 1536 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1537 { 1538 struct snd_pcm_runtime *runtime = substream->runtime; 1539 switch (runtime->status->state) { 1540 case SNDRV_PCM_STATE_OPEN: 1541 case SNDRV_PCM_STATE_DISCONNECTED: 1542 case SNDRV_PCM_STATE_SUSPENDED: 1543 return -EBADFD; 1544 } 1545 runtime->trigger_master = substream; 1546 return 0; 1547 } 1548 1549 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1550 { 1551 struct snd_pcm_runtime *runtime = substream->runtime; 1552 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1553 switch (runtime->status->state) { 1554 case SNDRV_PCM_STATE_PREPARED: 1555 /* start playback stream if possible */ 1556 if (! snd_pcm_playback_empty(substream)) { 1557 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1558 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1559 } else { 1560 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1561 } 1562 break; 1563 case SNDRV_PCM_STATE_RUNNING: 1564 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1565 break; 1566 case SNDRV_PCM_STATE_XRUN: 1567 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1568 break; 1569 default: 1570 break; 1571 } 1572 } else { 1573 /* stop running stream */ 1574 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1575 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1576 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1577 snd_pcm_do_stop(substream, new_state); 1578 snd_pcm_post_stop(substream, new_state); 1579 } 1580 } 1581 1582 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1583 runtime->trigger_master == substream && 1584 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1585 return substream->ops->trigger(substream, 1586 SNDRV_PCM_TRIGGER_DRAIN); 1587 1588 return 0; 1589 } 1590 1591 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1592 { 1593 } 1594 1595 static const struct action_ops snd_pcm_action_drain_init = { 1596 .pre_action = snd_pcm_pre_drain_init, 1597 .do_action = snd_pcm_do_drain_init, 1598 .post_action = snd_pcm_post_drain_init 1599 }; 1600 1601 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1602 1603 /* 1604 * Drain the stream(s). 1605 * When the substream is linked, sync until the draining of all playback streams 1606 * is finished. 1607 * After this call, all streams are supposed to be either SETUP or DRAINING 1608 * (capture only) state. 1609 */ 1610 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1611 struct file *file) 1612 { 1613 struct snd_card *card; 1614 struct snd_pcm_runtime *runtime; 1615 struct snd_pcm_substream *s; 1616 wait_queue_t wait; 1617 int result = 0; 1618 int nonblock = 0; 1619 1620 card = substream->pcm->card; 1621 runtime = substream->runtime; 1622 1623 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1624 return -EBADFD; 1625 1626 snd_power_lock(card); 1627 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1628 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1629 if (result < 0) { 1630 snd_power_unlock(card); 1631 return result; 1632 } 1633 } 1634 1635 if (file) { 1636 if (file->f_flags & O_NONBLOCK) 1637 nonblock = 1; 1638 } else if (substream->f_flags & O_NONBLOCK) 1639 nonblock = 1; 1640 1641 down_read(&snd_pcm_link_rwsem); 1642 snd_pcm_stream_lock_irq(substream); 1643 /* resume pause */ 1644 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1645 snd_pcm_pause(substream, 0); 1646 1647 /* pre-start/stop - all running streams are changed to DRAINING state */ 1648 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1649 if (result < 0) 1650 goto unlock; 1651 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1652 if (nonblock) { 1653 result = -EAGAIN; 1654 goto unlock; 1655 } 1656 1657 for (;;) { 1658 long tout; 1659 struct snd_pcm_runtime *to_check; 1660 if (signal_pending(current)) { 1661 result = -ERESTARTSYS; 1662 break; 1663 } 1664 /* find a substream to drain */ 1665 to_check = NULL; 1666 snd_pcm_group_for_each_entry(s, substream) { 1667 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1668 continue; 1669 runtime = s->runtime; 1670 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1671 to_check = runtime; 1672 break; 1673 } 1674 } 1675 if (!to_check) 1676 break; /* all drained */ 1677 init_waitqueue_entry(&wait, current); 1678 add_wait_queue(&to_check->sleep, &wait); 1679 snd_pcm_stream_unlock_irq(substream); 1680 up_read(&snd_pcm_link_rwsem); 1681 snd_power_unlock(card); 1682 if (runtime->no_period_wakeup) 1683 tout = MAX_SCHEDULE_TIMEOUT; 1684 else { 1685 tout = 10; 1686 if (runtime->rate) { 1687 long t = runtime->period_size * 2 / runtime->rate; 1688 tout = max(t, tout); 1689 } 1690 tout = msecs_to_jiffies(tout * 1000); 1691 } 1692 tout = schedule_timeout_interruptible(tout); 1693 snd_power_lock(card); 1694 down_read(&snd_pcm_link_rwsem); 1695 snd_pcm_stream_lock_irq(substream); 1696 remove_wait_queue(&to_check->sleep, &wait); 1697 if (card->shutdown) { 1698 result = -ENODEV; 1699 break; 1700 } 1701 if (tout == 0) { 1702 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1703 result = -ESTRPIPE; 1704 else { 1705 dev_dbg(substream->pcm->card->dev, 1706 "playback drain error (DMA or IRQ trouble?)\n"); 1707 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1708 result = -EIO; 1709 } 1710 break; 1711 } 1712 } 1713 1714 unlock: 1715 snd_pcm_stream_unlock_irq(substream); 1716 up_read(&snd_pcm_link_rwsem); 1717 snd_power_unlock(card); 1718 1719 return result; 1720 } 1721 1722 /* 1723 * drop ioctl 1724 * 1725 * Immediately put all linked substreams into SETUP state. 1726 */ 1727 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1728 { 1729 struct snd_pcm_runtime *runtime; 1730 int result = 0; 1731 1732 if (PCM_RUNTIME_CHECK(substream)) 1733 return -ENXIO; 1734 runtime = substream->runtime; 1735 1736 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1737 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1738 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1739 return -EBADFD; 1740 1741 snd_pcm_stream_lock_irq(substream); 1742 /* resume pause */ 1743 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1744 snd_pcm_pause(substream, 0); 1745 1746 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1747 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1748 snd_pcm_stream_unlock_irq(substream); 1749 1750 return result; 1751 } 1752 1753 1754 static bool is_pcm_file(struct file *file) 1755 { 1756 struct inode *inode = file_inode(file); 1757 unsigned int minor; 1758 1759 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1760 return false; 1761 minor = iminor(inode); 1762 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1763 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1764 } 1765 1766 /* 1767 * PCM link handling 1768 */ 1769 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1770 { 1771 int res = 0; 1772 struct snd_pcm_file *pcm_file; 1773 struct snd_pcm_substream *substream1; 1774 struct snd_pcm_group *group; 1775 struct fd f = fdget(fd); 1776 1777 if (!f.file) 1778 return -EBADFD; 1779 if (!is_pcm_file(f.file)) { 1780 res = -EBADFD; 1781 goto _badf; 1782 } 1783 pcm_file = f.file->private_data; 1784 substream1 = pcm_file->substream; 1785 group = kmalloc(sizeof(*group), GFP_KERNEL); 1786 if (!group) { 1787 res = -ENOMEM; 1788 goto _nolock; 1789 } 1790 down_write_nonblock(&snd_pcm_link_rwsem); 1791 write_lock_irq(&snd_pcm_link_rwlock); 1792 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1793 substream->runtime->status->state != substream1->runtime->status->state || 1794 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1795 res = -EBADFD; 1796 goto _end; 1797 } 1798 if (snd_pcm_stream_linked(substream1)) { 1799 res = -EALREADY; 1800 goto _end; 1801 } 1802 if (!snd_pcm_stream_linked(substream)) { 1803 substream->group = group; 1804 group = NULL; 1805 spin_lock_init(&substream->group->lock); 1806 mutex_init(&substream->group->mutex); 1807 INIT_LIST_HEAD(&substream->group->substreams); 1808 list_add_tail(&substream->link_list, &substream->group->substreams); 1809 substream->group->count = 1; 1810 } 1811 list_add_tail(&substream1->link_list, &substream->group->substreams); 1812 substream->group->count++; 1813 substream1->group = substream->group; 1814 _end: 1815 write_unlock_irq(&snd_pcm_link_rwlock); 1816 up_write(&snd_pcm_link_rwsem); 1817 _nolock: 1818 snd_card_unref(substream1->pcm->card); 1819 kfree(group); 1820 _badf: 1821 fdput(f); 1822 return res; 1823 } 1824 1825 static void relink_to_local(struct snd_pcm_substream *substream) 1826 { 1827 substream->group = &substream->self_group; 1828 INIT_LIST_HEAD(&substream->self_group.substreams); 1829 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1830 } 1831 1832 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1833 { 1834 struct snd_pcm_substream *s; 1835 int res = 0; 1836 1837 down_write_nonblock(&snd_pcm_link_rwsem); 1838 write_lock_irq(&snd_pcm_link_rwlock); 1839 if (!snd_pcm_stream_linked(substream)) { 1840 res = -EALREADY; 1841 goto _end; 1842 } 1843 list_del(&substream->link_list); 1844 substream->group->count--; 1845 if (substream->group->count == 1) { /* detach the last stream, too */ 1846 snd_pcm_group_for_each_entry(s, substream) { 1847 relink_to_local(s); 1848 break; 1849 } 1850 kfree(substream->group); 1851 } 1852 relink_to_local(substream); 1853 _end: 1854 write_unlock_irq(&snd_pcm_link_rwlock); 1855 up_write(&snd_pcm_link_rwsem); 1856 return res; 1857 } 1858 1859 /* 1860 * hw configurator 1861 */ 1862 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1863 struct snd_pcm_hw_rule *rule) 1864 { 1865 struct snd_interval t; 1866 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1867 hw_param_interval_c(params, rule->deps[1]), &t); 1868 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1869 } 1870 1871 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1872 struct snd_pcm_hw_rule *rule) 1873 { 1874 struct snd_interval t; 1875 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1876 hw_param_interval_c(params, rule->deps[1]), &t); 1877 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1878 } 1879 1880 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1881 struct snd_pcm_hw_rule *rule) 1882 { 1883 struct snd_interval t; 1884 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1885 hw_param_interval_c(params, rule->deps[1]), 1886 (unsigned long) rule->private, &t); 1887 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1888 } 1889 1890 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1891 struct snd_pcm_hw_rule *rule) 1892 { 1893 struct snd_interval t; 1894 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1895 (unsigned long) rule->private, 1896 hw_param_interval_c(params, rule->deps[1]), &t); 1897 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1898 } 1899 1900 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1901 struct snd_pcm_hw_rule *rule) 1902 { 1903 unsigned int k; 1904 const struct snd_interval *i = 1905 hw_param_interval_c(params, rule->deps[0]); 1906 struct snd_mask m; 1907 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1908 snd_mask_any(&m); 1909 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1910 int bits; 1911 if (! snd_mask_test(mask, k)) 1912 continue; 1913 bits = snd_pcm_format_physical_width(k); 1914 if (bits <= 0) 1915 continue; /* ignore invalid formats */ 1916 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1917 snd_mask_reset(&m, k); 1918 } 1919 return snd_mask_refine(mask, &m); 1920 } 1921 1922 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1923 struct snd_pcm_hw_rule *rule) 1924 { 1925 struct snd_interval t; 1926 unsigned int k; 1927 t.min = UINT_MAX; 1928 t.max = 0; 1929 t.openmin = 0; 1930 t.openmax = 0; 1931 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1932 int bits; 1933 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1934 continue; 1935 bits = snd_pcm_format_physical_width(k); 1936 if (bits <= 0) 1937 continue; /* ignore invalid formats */ 1938 if (t.min > (unsigned)bits) 1939 t.min = bits; 1940 if (t.max < (unsigned)bits) 1941 t.max = bits; 1942 } 1943 t.integer = 1; 1944 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1945 } 1946 1947 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1948 #error "Change this table" 1949 #endif 1950 1951 static const unsigned int rates[] = { 1952 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1953 48000, 64000, 88200, 96000, 176400, 192000 1954 }; 1955 1956 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1957 .count = ARRAY_SIZE(rates), 1958 .list = rates, 1959 }; 1960 1961 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1962 struct snd_pcm_hw_rule *rule) 1963 { 1964 struct snd_pcm_hardware *hw = rule->private; 1965 return snd_interval_list(hw_param_interval(params, rule->var), 1966 snd_pcm_known_rates.count, 1967 snd_pcm_known_rates.list, hw->rates); 1968 } 1969 1970 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1971 struct snd_pcm_hw_rule *rule) 1972 { 1973 struct snd_interval t; 1974 struct snd_pcm_substream *substream = rule->private; 1975 t.min = 0; 1976 t.max = substream->buffer_bytes_max; 1977 t.openmin = 0; 1978 t.openmax = 0; 1979 t.integer = 1; 1980 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1981 } 1982 1983 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1984 { 1985 struct snd_pcm_runtime *runtime = substream->runtime; 1986 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1987 int k, err; 1988 1989 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1990 snd_mask_any(constrs_mask(constrs, k)); 1991 } 1992 1993 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1994 snd_interval_any(constrs_interval(constrs, k)); 1995 } 1996 1997 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1998 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1999 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2000 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2001 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2002 2003 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2004 snd_pcm_hw_rule_format, NULL, 2005 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2006 if (err < 0) 2007 return err; 2008 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2009 snd_pcm_hw_rule_sample_bits, NULL, 2010 SNDRV_PCM_HW_PARAM_FORMAT, 2011 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2012 if (err < 0) 2013 return err; 2014 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2015 snd_pcm_hw_rule_div, NULL, 2016 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2017 if (err < 0) 2018 return err; 2019 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2020 snd_pcm_hw_rule_mul, NULL, 2021 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2022 if (err < 0) 2023 return err; 2024 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2025 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2026 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2027 if (err < 0) 2028 return err; 2029 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2030 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2031 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2032 if (err < 0) 2033 return err; 2034 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2035 snd_pcm_hw_rule_div, NULL, 2036 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2037 if (err < 0) 2038 return err; 2039 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2040 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2041 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2042 if (err < 0) 2043 return err; 2044 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2045 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2046 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2047 if (err < 0) 2048 return err; 2049 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2050 snd_pcm_hw_rule_div, NULL, 2051 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2052 if (err < 0) 2053 return err; 2054 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2055 snd_pcm_hw_rule_div, NULL, 2056 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2057 if (err < 0) 2058 return err; 2059 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2060 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2061 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2062 if (err < 0) 2063 return err; 2064 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2065 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2066 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2067 if (err < 0) 2068 return err; 2069 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2070 snd_pcm_hw_rule_mul, NULL, 2071 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2072 if (err < 0) 2073 return err; 2074 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2075 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2076 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2077 if (err < 0) 2078 return err; 2079 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2080 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2081 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2082 if (err < 0) 2083 return err; 2084 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2085 snd_pcm_hw_rule_muldivk, (void*) 8, 2086 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2087 if (err < 0) 2088 return err; 2089 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2090 snd_pcm_hw_rule_muldivk, (void*) 8, 2091 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2092 if (err < 0) 2093 return err; 2094 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2095 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2096 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2097 if (err < 0) 2098 return err; 2099 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2100 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2101 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2102 if (err < 0) 2103 return err; 2104 return 0; 2105 } 2106 2107 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2108 { 2109 struct snd_pcm_runtime *runtime = substream->runtime; 2110 struct snd_pcm_hardware *hw = &runtime->hw; 2111 int err; 2112 unsigned int mask = 0; 2113 2114 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2115 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2116 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2117 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2118 if (hw_support_mmap(substream)) { 2119 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2120 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2121 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2122 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2123 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2124 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2125 } 2126 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2127 if (err < 0) 2128 return err; 2129 2130 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2131 if (err < 0) 2132 return err; 2133 2134 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2135 if (err < 0) 2136 return err; 2137 2138 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2139 hw->channels_min, hw->channels_max); 2140 if (err < 0) 2141 return err; 2142 2143 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2144 hw->rate_min, hw->rate_max); 2145 if (err < 0) 2146 return err; 2147 2148 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2149 hw->period_bytes_min, hw->period_bytes_max); 2150 if (err < 0) 2151 return err; 2152 2153 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2154 hw->periods_min, hw->periods_max); 2155 if (err < 0) 2156 return err; 2157 2158 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2159 hw->period_bytes_min, hw->buffer_bytes_max); 2160 if (err < 0) 2161 return err; 2162 2163 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2164 snd_pcm_hw_rule_buffer_bytes_max, substream, 2165 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2166 if (err < 0) 2167 return err; 2168 2169 /* FIXME: remove */ 2170 if (runtime->dma_bytes) { 2171 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2172 if (err < 0) 2173 return err; 2174 } 2175 2176 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2177 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2178 snd_pcm_hw_rule_rate, hw, 2179 SNDRV_PCM_HW_PARAM_RATE, -1); 2180 if (err < 0) 2181 return err; 2182 } 2183 2184 /* FIXME: this belong to lowlevel */ 2185 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2186 2187 return 0; 2188 } 2189 2190 static void pcm_release_private(struct snd_pcm_substream *substream) 2191 { 2192 snd_pcm_unlink(substream); 2193 } 2194 2195 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2196 { 2197 substream->ref_count--; 2198 if (substream->ref_count > 0) 2199 return; 2200 2201 snd_pcm_drop(substream); 2202 if (substream->hw_opened) { 2203 if (substream->ops->hw_free && 2204 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2205 substream->ops->hw_free(substream); 2206 substream->ops->close(substream); 2207 substream->hw_opened = 0; 2208 } 2209 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2210 pm_qos_remove_request(&substream->latency_pm_qos_req); 2211 if (substream->pcm_release) { 2212 substream->pcm_release(substream); 2213 substream->pcm_release = NULL; 2214 } 2215 snd_pcm_detach_substream(substream); 2216 } 2217 2218 EXPORT_SYMBOL(snd_pcm_release_substream); 2219 2220 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2221 struct file *file, 2222 struct snd_pcm_substream **rsubstream) 2223 { 2224 struct snd_pcm_substream *substream; 2225 int err; 2226 2227 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2228 if (err < 0) 2229 return err; 2230 if (substream->ref_count > 1) { 2231 *rsubstream = substream; 2232 return 0; 2233 } 2234 2235 err = snd_pcm_hw_constraints_init(substream); 2236 if (err < 0) { 2237 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2238 goto error; 2239 } 2240 2241 if ((err = substream->ops->open(substream)) < 0) 2242 goto error; 2243 2244 substream->hw_opened = 1; 2245 2246 err = snd_pcm_hw_constraints_complete(substream); 2247 if (err < 0) { 2248 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2249 goto error; 2250 } 2251 2252 *rsubstream = substream; 2253 return 0; 2254 2255 error: 2256 snd_pcm_release_substream(substream); 2257 return err; 2258 } 2259 2260 EXPORT_SYMBOL(snd_pcm_open_substream); 2261 2262 static int snd_pcm_open_file(struct file *file, 2263 struct snd_pcm *pcm, 2264 int stream) 2265 { 2266 struct snd_pcm_file *pcm_file; 2267 struct snd_pcm_substream *substream; 2268 int err; 2269 2270 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2271 if (err < 0) 2272 return err; 2273 2274 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2275 if (pcm_file == NULL) { 2276 snd_pcm_release_substream(substream); 2277 return -ENOMEM; 2278 } 2279 pcm_file->substream = substream; 2280 if (substream->ref_count == 1) { 2281 substream->file = pcm_file; 2282 substream->pcm_release = pcm_release_private; 2283 } 2284 file->private_data = pcm_file; 2285 2286 return 0; 2287 } 2288 2289 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2290 { 2291 struct snd_pcm *pcm; 2292 int err = nonseekable_open(inode, file); 2293 if (err < 0) 2294 return err; 2295 pcm = snd_lookup_minor_data(iminor(inode), 2296 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2297 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2298 if (pcm) 2299 snd_card_unref(pcm->card); 2300 return err; 2301 } 2302 2303 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2304 { 2305 struct snd_pcm *pcm; 2306 int err = nonseekable_open(inode, file); 2307 if (err < 0) 2308 return err; 2309 pcm = snd_lookup_minor_data(iminor(inode), 2310 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2311 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2312 if (pcm) 2313 snd_card_unref(pcm->card); 2314 return err; 2315 } 2316 2317 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2318 { 2319 int err; 2320 wait_queue_t wait; 2321 2322 if (pcm == NULL) { 2323 err = -ENODEV; 2324 goto __error1; 2325 } 2326 err = snd_card_file_add(pcm->card, file); 2327 if (err < 0) 2328 goto __error1; 2329 if (!try_module_get(pcm->card->module)) { 2330 err = -EFAULT; 2331 goto __error2; 2332 } 2333 init_waitqueue_entry(&wait, current); 2334 add_wait_queue(&pcm->open_wait, &wait); 2335 mutex_lock(&pcm->open_mutex); 2336 while (1) { 2337 err = snd_pcm_open_file(file, pcm, stream); 2338 if (err >= 0) 2339 break; 2340 if (err == -EAGAIN) { 2341 if (file->f_flags & O_NONBLOCK) { 2342 err = -EBUSY; 2343 break; 2344 } 2345 } else 2346 break; 2347 set_current_state(TASK_INTERRUPTIBLE); 2348 mutex_unlock(&pcm->open_mutex); 2349 schedule(); 2350 mutex_lock(&pcm->open_mutex); 2351 if (pcm->card->shutdown) { 2352 err = -ENODEV; 2353 break; 2354 } 2355 if (signal_pending(current)) { 2356 err = -ERESTARTSYS; 2357 break; 2358 } 2359 } 2360 remove_wait_queue(&pcm->open_wait, &wait); 2361 mutex_unlock(&pcm->open_mutex); 2362 if (err < 0) 2363 goto __error; 2364 return err; 2365 2366 __error: 2367 module_put(pcm->card->module); 2368 __error2: 2369 snd_card_file_remove(pcm->card, file); 2370 __error1: 2371 return err; 2372 } 2373 2374 static int snd_pcm_release(struct inode *inode, struct file *file) 2375 { 2376 struct snd_pcm *pcm; 2377 struct snd_pcm_substream *substream; 2378 struct snd_pcm_file *pcm_file; 2379 2380 pcm_file = file->private_data; 2381 substream = pcm_file->substream; 2382 if (snd_BUG_ON(!substream)) 2383 return -ENXIO; 2384 pcm = substream->pcm; 2385 mutex_lock(&pcm->open_mutex); 2386 snd_pcm_release_substream(substream); 2387 kfree(pcm_file); 2388 mutex_unlock(&pcm->open_mutex); 2389 wake_up(&pcm->open_wait); 2390 module_put(pcm->card->module); 2391 snd_card_file_remove(pcm->card, file); 2392 return 0; 2393 } 2394 2395 /* check and update PCM state; return 0 or a negative error 2396 * call this inside PCM lock 2397 */ 2398 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2399 { 2400 switch (substream->runtime->status->state) { 2401 case SNDRV_PCM_STATE_DRAINING: 2402 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2403 return -EBADFD; 2404 /* Fall through */ 2405 case SNDRV_PCM_STATE_RUNNING: 2406 return snd_pcm_update_hw_ptr(substream); 2407 case SNDRV_PCM_STATE_PREPARED: 2408 case SNDRV_PCM_STATE_PAUSED: 2409 return 0; 2410 case SNDRV_PCM_STATE_SUSPENDED: 2411 return -ESTRPIPE; 2412 case SNDRV_PCM_STATE_XRUN: 2413 return -EPIPE; 2414 default: 2415 return -EBADFD; 2416 } 2417 } 2418 2419 /* update to the given appl_ptr and call ack callback if needed; 2420 * when an error is returned, take back to the original value 2421 */ 2422 static int apply_appl_ptr(struct snd_pcm_substream *substream, 2423 snd_pcm_uframes_t appl_ptr) 2424 { 2425 struct snd_pcm_runtime *runtime = substream->runtime; 2426 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr; 2427 int ret; 2428 2429 runtime->control->appl_ptr = appl_ptr; 2430 if (substream->ops->ack) { 2431 ret = substream->ops->ack(substream); 2432 if (ret < 0) { 2433 runtime->control->appl_ptr = old_appl_ptr; 2434 return ret; 2435 } 2436 } 2437 return 0; 2438 } 2439 2440 /* increase the appl_ptr; returns the processed frames or a negative error */ 2441 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2442 snd_pcm_uframes_t frames, 2443 snd_pcm_sframes_t avail) 2444 { 2445 struct snd_pcm_runtime *runtime = substream->runtime; 2446 snd_pcm_sframes_t appl_ptr; 2447 int ret; 2448 2449 if (avail <= 0) 2450 return 0; 2451 if (frames > (snd_pcm_uframes_t)avail) 2452 frames = avail; 2453 appl_ptr = runtime->control->appl_ptr + frames; 2454 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2455 appl_ptr -= runtime->boundary; 2456 ret = apply_appl_ptr(substream, appl_ptr); 2457 return ret < 0 ? ret : frames; 2458 } 2459 2460 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2461 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2462 snd_pcm_uframes_t frames, 2463 snd_pcm_sframes_t avail) 2464 { 2465 struct snd_pcm_runtime *runtime = substream->runtime; 2466 snd_pcm_sframes_t appl_ptr; 2467 int ret; 2468 2469 if (avail <= 0) 2470 return 0; 2471 if (frames > (snd_pcm_uframes_t)avail) 2472 frames = avail; 2473 appl_ptr = runtime->control->appl_ptr - frames; 2474 if (appl_ptr < 0) 2475 appl_ptr += runtime->boundary; 2476 ret = apply_appl_ptr(substream, appl_ptr); 2477 return ret < 0 ? ret : frames; 2478 } 2479 2480 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2481 snd_pcm_uframes_t frames) 2482 { 2483 struct snd_pcm_runtime *runtime = substream->runtime; 2484 snd_pcm_sframes_t ret; 2485 2486 if (frames == 0) 2487 return 0; 2488 2489 snd_pcm_stream_lock_irq(substream); 2490 ret = do_pcm_hwsync(substream); 2491 if (!ret) 2492 ret = rewind_appl_ptr(substream, frames, 2493 snd_pcm_playback_hw_avail(runtime)); 2494 snd_pcm_stream_unlock_irq(substream); 2495 return ret; 2496 } 2497 2498 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2499 snd_pcm_uframes_t frames) 2500 { 2501 struct snd_pcm_runtime *runtime = substream->runtime; 2502 snd_pcm_sframes_t ret; 2503 2504 if (frames == 0) 2505 return 0; 2506 2507 snd_pcm_stream_lock_irq(substream); 2508 ret = do_pcm_hwsync(substream); 2509 if (!ret) 2510 ret = rewind_appl_ptr(substream, frames, 2511 snd_pcm_capture_hw_avail(runtime)); 2512 snd_pcm_stream_unlock_irq(substream); 2513 return ret; 2514 } 2515 2516 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2517 snd_pcm_uframes_t frames) 2518 { 2519 struct snd_pcm_runtime *runtime = substream->runtime; 2520 snd_pcm_sframes_t ret; 2521 2522 if (frames == 0) 2523 return 0; 2524 2525 snd_pcm_stream_lock_irq(substream); 2526 ret = do_pcm_hwsync(substream); 2527 if (!ret) 2528 ret = forward_appl_ptr(substream, frames, 2529 snd_pcm_playback_avail(runtime)); 2530 snd_pcm_stream_unlock_irq(substream); 2531 return ret; 2532 } 2533 2534 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2535 snd_pcm_uframes_t frames) 2536 { 2537 struct snd_pcm_runtime *runtime = substream->runtime; 2538 snd_pcm_sframes_t ret; 2539 2540 if (frames == 0) 2541 return 0; 2542 2543 snd_pcm_stream_lock_irq(substream); 2544 ret = do_pcm_hwsync(substream); 2545 if (!ret) 2546 ret = forward_appl_ptr(substream, frames, 2547 snd_pcm_capture_avail(runtime)); 2548 snd_pcm_stream_unlock_irq(substream); 2549 return ret; 2550 } 2551 2552 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2553 { 2554 int err; 2555 2556 snd_pcm_stream_lock_irq(substream); 2557 err = do_pcm_hwsync(substream); 2558 snd_pcm_stream_unlock_irq(substream); 2559 return err; 2560 } 2561 2562 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2563 { 2564 struct snd_pcm_runtime *runtime = substream->runtime; 2565 int err; 2566 snd_pcm_sframes_t n = 0; 2567 2568 snd_pcm_stream_lock_irq(substream); 2569 err = do_pcm_hwsync(substream); 2570 if (!err) { 2571 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2572 n = snd_pcm_playback_hw_avail(runtime); 2573 else 2574 n = snd_pcm_capture_avail(runtime); 2575 n += runtime->delay; 2576 } 2577 snd_pcm_stream_unlock_irq(substream); 2578 return err < 0 ? err : n; 2579 } 2580 2581 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2582 struct snd_pcm_sync_ptr __user *_sync_ptr) 2583 { 2584 struct snd_pcm_runtime *runtime = substream->runtime; 2585 struct snd_pcm_sync_ptr sync_ptr; 2586 volatile struct snd_pcm_mmap_status *status; 2587 volatile struct snd_pcm_mmap_control *control; 2588 int err; 2589 2590 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2591 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2592 return -EFAULT; 2593 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2594 return -EFAULT; 2595 status = runtime->status; 2596 control = runtime->control; 2597 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2598 err = snd_pcm_hwsync(substream); 2599 if (err < 0) 2600 return err; 2601 } 2602 snd_pcm_stream_lock_irq(substream); 2603 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2604 err = apply_appl_ptr(substream, sync_ptr.c.control.appl_ptr); 2605 if (err < 0) { 2606 snd_pcm_stream_unlock_irq(substream); 2607 return err; 2608 } 2609 } else { 2610 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2611 } 2612 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2613 control->avail_min = sync_ptr.c.control.avail_min; 2614 else 2615 sync_ptr.c.control.avail_min = control->avail_min; 2616 sync_ptr.s.status.state = status->state; 2617 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2618 sync_ptr.s.status.tstamp = status->tstamp; 2619 sync_ptr.s.status.suspended_state = status->suspended_state; 2620 snd_pcm_stream_unlock_irq(substream); 2621 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2622 return -EFAULT; 2623 return 0; 2624 } 2625 2626 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2627 { 2628 struct snd_pcm_runtime *runtime = substream->runtime; 2629 int arg; 2630 2631 if (get_user(arg, _arg)) 2632 return -EFAULT; 2633 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2634 return -EINVAL; 2635 runtime->tstamp_type = arg; 2636 return 0; 2637 } 2638 2639 static int snd_pcm_common_ioctl1(struct file *file, 2640 struct snd_pcm_substream *substream, 2641 unsigned int cmd, void __user *arg) 2642 { 2643 switch (cmd) { 2644 case SNDRV_PCM_IOCTL_PVERSION: 2645 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2646 case SNDRV_PCM_IOCTL_INFO: 2647 return snd_pcm_info_user(substream, arg); 2648 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2649 return 0; 2650 case SNDRV_PCM_IOCTL_TTSTAMP: 2651 return snd_pcm_tstamp(substream, arg); 2652 case SNDRV_PCM_IOCTL_HW_REFINE: 2653 return snd_pcm_hw_refine_user(substream, arg); 2654 case SNDRV_PCM_IOCTL_HW_PARAMS: 2655 return snd_pcm_hw_params_user(substream, arg); 2656 case SNDRV_PCM_IOCTL_HW_FREE: 2657 return snd_pcm_hw_free(substream); 2658 case SNDRV_PCM_IOCTL_SW_PARAMS: 2659 return snd_pcm_sw_params_user(substream, arg); 2660 case SNDRV_PCM_IOCTL_STATUS: 2661 return snd_pcm_status_user(substream, arg, false); 2662 case SNDRV_PCM_IOCTL_STATUS_EXT: 2663 return snd_pcm_status_user(substream, arg, true); 2664 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2665 return snd_pcm_channel_info_user(substream, arg); 2666 case SNDRV_PCM_IOCTL_PREPARE: 2667 return snd_pcm_prepare(substream, file); 2668 case SNDRV_PCM_IOCTL_RESET: 2669 return snd_pcm_reset(substream); 2670 case SNDRV_PCM_IOCTL_START: 2671 return snd_pcm_start_lock_irq(substream); 2672 case SNDRV_PCM_IOCTL_LINK: 2673 return snd_pcm_link(substream, (int)(unsigned long) arg); 2674 case SNDRV_PCM_IOCTL_UNLINK: 2675 return snd_pcm_unlink(substream); 2676 case SNDRV_PCM_IOCTL_RESUME: 2677 return snd_pcm_resume(substream); 2678 case SNDRV_PCM_IOCTL_XRUN: 2679 return snd_pcm_xrun(substream); 2680 case SNDRV_PCM_IOCTL_HWSYNC: 2681 return snd_pcm_hwsync(substream); 2682 case SNDRV_PCM_IOCTL_DELAY: 2683 { 2684 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2685 snd_pcm_sframes_t __user *res = arg; 2686 2687 if (delay < 0) 2688 return delay; 2689 if (put_user(delay, res)) 2690 return -EFAULT; 2691 return 0; 2692 } 2693 case SNDRV_PCM_IOCTL_SYNC_PTR: 2694 return snd_pcm_sync_ptr(substream, arg); 2695 #ifdef CONFIG_SND_SUPPORT_OLD_API 2696 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2697 return snd_pcm_hw_refine_old_user(substream, arg); 2698 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2699 return snd_pcm_hw_params_old_user(substream, arg); 2700 #endif 2701 case SNDRV_PCM_IOCTL_DRAIN: 2702 return snd_pcm_drain(substream, file); 2703 case SNDRV_PCM_IOCTL_DROP: 2704 return snd_pcm_drop(substream); 2705 case SNDRV_PCM_IOCTL_PAUSE: 2706 { 2707 int res; 2708 snd_pcm_stream_lock_irq(substream); 2709 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2710 snd_pcm_stream_unlock_irq(substream); 2711 return res; 2712 } 2713 } 2714 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2715 return -ENOTTY; 2716 } 2717 2718 static int snd_pcm_playback_ioctl1(struct file *file, 2719 struct snd_pcm_substream *substream, 2720 unsigned int cmd, void __user *arg) 2721 { 2722 if (snd_BUG_ON(!substream)) 2723 return -ENXIO; 2724 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2725 return -EINVAL; 2726 switch (cmd) { 2727 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2728 { 2729 struct snd_xferi xferi; 2730 struct snd_xferi __user *_xferi = arg; 2731 struct snd_pcm_runtime *runtime = substream->runtime; 2732 snd_pcm_sframes_t result; 2733 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2734 return -EBADFD; 2735 if (put_user(0, &_xferi->result)) 2736 return -EFAULT; 2737 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2738 return -EFAULT; 2739 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2740 __put_user(result, &_xferi->result); 2741 return result < 0 ? result : 0; 2742 } 2743 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2744 { 2745 struct snd_xfern xfern; 2746 struct snd_xfern __user *_xfern = arg; 2747 struct snd_pcm_runtime *runtime = substream->runtime; 2748 void __user **bufs; 2749 snd_pcm_sframes_t result; 2750 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2751 return -EBADFD; 2752 if (runtime->channels > 128) 2753 return -EINVAL; 2754 if (put_user(0, &_xfern->result)) 2755 return -EFAULT; 2756 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2757 return -EFAULT; 2758 2759 bufs = memdup_user(xfern.bufs, 2760 sizeof(void *) * runtime->channels); 2761 if (IS_ERR(bufs)) 2762 return PTR_ERR(bufs); 2763 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2764 kfree(bufs); 2765 __put_user(result, &_xfern->result); 2766 return result < 0 ? result : 0; 2767 } 2768 case SNDRV_PCM_IOCTL_REWIND: 2769 { 2770 snd_pcm_uframes_t frames; 2771 snd_pcm_uframes_t __user *_frames = arg; 2772 snd_pcm_sframes_t result; 2773 if (get_user(frames, _frames)) 2774 return -EFAULT; 2775 if (put_user(0, _frames)) 2776 return -EFAULT; 2777 result = snd_pcm_playback_rewind(substream, frames); 2778 __put_user(result, _frames); 2779 return result < 0 ? result : 0; 2780 } 2781 case SNDRV_PCM_IOCTL_FORWARD: 2782 { 2783 snd_pcm_uframes_t frames; 2784 snd_pcm_uframes_t __user *_frames = arg; 2785 snd_pcm_sframes_t result; 2786 if (get_user(frames, _frames)) 2787 return -EFAULT; 2788 if (put_user(0, _frames)) 2789 return -EFAULT; 2790 result = snd_pcm_playback_forward(substream, frames); 2791 __put_user(result, _frames); 2792 return result < 0 ? result : 0; 2793 } 2794 } 2795 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2796 } 2797 2798 static int snd_pcm_capture_ioctl1(struct file *file, 2799 struct snd_pcm_substream *substream, 2800 unsigned int cmd, void __user *arg) 2801 { 2802 if (snd_BUG_ON(!substream)) 2803 return -ENXIO; 2804 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2805 return -EINVAL; 2806 switch (cmd) { 2807 case SNDRV_PCM_IOCTL_READI_FRAMES: 2808 { 2809 struct snd_xferi xferi; 2810 struct snd_xferi __user *_xferi = arg; 2811 struct snd_pcm_runtime *runtime = substream->runtime; 2812 snd_pcm_sframes_t result; 2813 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2814 return -EBADFD; 2815 if (put_user(0, &_xferi->result)) 2816 return -EFAULT; 2817 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2818 return -EFAULT; 2819 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2820 __put_user(result, &_xferi->result); 2821 return result < 0 ? result : 0; 2822 } 2823 case SNDRV_PCM_IOCTL_READN_FRAMES: 2824 { 2825 struct snd_xfern xfern; 2826 struct snd_xfern __user *_xfern = arg; 2827 struct snd_pcm_runtime *runtime = substream->runtime; 2828 void *bufs; 2829 snd_pcm_sframes_t result; 2830 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2831 return -EBADFD; 2832 if (runtime->channels > 128) 2833 return -EINVAL; 2834 if (put_user(0, &_xfern->result)) 2835 return -EFAULT; 2836 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2837 return -EFAULT; 2838 2839 bufs = memdup_user(xfern.bufs, 2840 sizeof(void *) * runtime->channels); 2841 if (IS_ERR(bufs)) 2842 return PTR_ERR(bufs); 2843 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2844 kfree(bufs); 2845 __put_user(result, &_xfern->result); 2846 return result < 0 ? result : 0; 2847 } 2848 case SNDRV_PCM_IOCTL_REWIND: 2849 { 2850 snd_pcm_uframes_t frames; 2851 snd_pcm_uframes_t __user *_frames = arg; 2852 snd_pcm_sframes_t result; 2853 if (get_user(frames, _frames)) 2854 return -EFAULT; 2855 if (put_user(0, _frames)) 2856 return -EFAULT; 2857 result = snd_pcm_capture_rewind(substream, frames); 2858 __put_user(result, _frames); 2859 return result < 0 ? result : 0; 2860 } 2861 case SNDRV_PCM_IOCTL_FORWARD: 2862 { 2863 snd_pcm_uframes_t frames; 2864 snd_pcm_uframes_t __user *_frames = arg; 2865 snd_pcm_sframes_t result; 2866 if (get_user(frames, _frames)) 2867 return -EFAULT; 2868 if (put_user(0, _frames)) 2869 return -EFAULT; 2870 result = snd_pcm_capture_forward(substream, frames); 2871 __put_user(result, _frames); 2872 return result < 0 ? result : 0; 2873 } 2874 } 2875 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2876 } 2877 2878 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2879 unsigned long arg) 2880 { 2881 struct snd_pcm_file *pcm_file; 2882 2883 pcm_file = file->private_data; 2884 2885 if (((cmd >> 8) & 0xff) != 'A') 2886 return -ENOTTY; 2887 2888 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2889 (void __user *)arg); 2890 } 2891 2892 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2893 unsigned long arg) 2894 { 2895 struct snd_pcm_file *pcm_file; 2896 2897 pcm_file = file->private_data; 2898 2899 if (((cmd >> 8) & 0xff) != 'A') 2900 return -ENOTTY; 2901 2902 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2903 (void __user *)arg); 2904 } 2905 2906 /** 2907 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2908 * @substream: PCM substream 2909 * @cmd: IOCTL cmd 2910 * @arg: IOCTL argument 2911 * 2912 * The function is provided primarily for OSS layer and USB gadget drivers, 2913 * and it allows only the limited set of ioctls (hw_params, sw_params, 2914 * prepare, start, drain, drop, forward). 2915 */ 2916 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2917 unsigned int cmd, void *arg) 2918 { 2919 snd_pcm_uframes_t *frames = arg; 2920 snd_pcm_sframes_t result; 2921 2922 switch (cmd) { 2923 case SNDRV_PCM_IOCTL_FORWARD: 2924 { 2925 /* provided only for OSS; capture-only and no value returned */ 2926 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 2927 return -EINVAL; 2928 result = snd_pcm_capture_forward(substream, *frames); 2929 return result < 0 ? result : 0; 2930 } 2931 case SNDRV_PCM_IOCTL_HW_PARAMS: 2932 return snd_pcm_hw_params(substream, arg); 2933 case SNDRV_PCM_IOCTL_SW_PARAMS: 2934 return snd_pcm_sw_params(substream, arg); 2935 case SNDRV_PCM_IOCTL_PREPARE: 2936 return snd_pcm_prepare(substream, NULL); 2937 case SNDRV_PCM_IOCTL_START: 2938 return snd_pcm_start_lock_irq(substream); 2939 case SNDRV_PCM_IOCTL_DRAIN: 2940 return snd_pcm_drain(substream, NULL); 2941 case SNDRV_PCM_IOCTL_DROP: 2942 return snd_pcm_drop(substream); 2943 case SNDRV_PCM_IOCTL_DELAY: 2944 { 2945 result = snd_pcm_delay(substream); 2946 if (result < 0) 2947 return result; 2948 *frames = result; 2949 return 0; 2950 } 2951 default: 2952 return -EINVAL; 2953 } 2954 } 2955 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2956 2957 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2958 loff_t * offset) 2959 { 2960 struct snd_pcm_file *pcm_file; 2961 struct snd_pcm_substream *substream; 2962 struct snd_pcm_runtime *runtime; 2963 snd_pcm_sframes_t result; 2964 2965 pcm_file = file->private_data; 2966 substream = pcm_file->substream; 2967 if (PCM_RUNTIME_CHECK(substream)) 2968 return -ENXIO; 2969 runtime = substream->runtime; 2970 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2971 return -EBADFD; 2972 if (!frame_aligned(runtime, count)) 2973 return -EINVAL; 2974 count = bytes_to_frames(runtime, count); 2975 result = snd_pcm_lib_read(substream, buf, count); 2976 if (result > 0) 2977 result = frames_to_bytes(runtime, result); 2978 return result; 2979 } 2980 2981 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2982 size_t count, loff_t * offset) 2983 { 2984 struct snd_pcm_file *pcm_file; 2985 struct snd_pcm_substream *substream; 2986 struct snd_pcm_runtime *runtime; 2987 snd_pcm_sframes_t result; 2988 2989 pcm_file = file->private_data; 2990 substream = pcm_file->substream; 2991 if (PCM_RUNTIME_CHECK(substream)) 2992 return -ENXIO; 2993 runtime = substream->runtime; 2994 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2995 return -EBADFD; 2996 if (!frame_aligned(runtime, count)) 2997 return -EINVAL; 2998 count = bytes_to_frames(runtime, count); 2999 result = snd_pcm_lib_write(substream, buf, count); 3000 if (result > 0) 3001 result = frames_to_bytes(runtime, result); 3002 return result; 3003 } 3004 3005 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3006 { 3007 struct snd_pcm_file *pcm_file; 3008 struct snd_pcm_substream *substream; 3009 struct snd_pcm_runtime *runtime; 3010 snd_pcm_sframes_t result; 3011 unsigned long i; 3012 void __user **bufs; 3013 snd_pcm_uframes_t frames; 3014 3015 pcm_file = iocb->ki_filp->private_data; 3016 substream = pcm_file->substream; 3017 if (PCM_RUNTIME_CHECK(substream)) 3018 return -ENXIO; 3019 runtime = substream->runtime; 3020 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3021 return -EBADFD; 3022 if (!iter_is_iovec(to)) 3023 return -EINVAL; 3024 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3025 return -EINVAL; 3026 if (!frame_aligned(runtime, to->iov->iov_len)) 3027 return -EINVAL; 3028 frames = bytes_to_samples(runtime, to->iov->iov_len); 3029 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3030 if (bufs == NULL) 3031 return -ENOMEM; 3032 for (i = 0; i < to->nr_segs; ++i) 3033 bufs[i] = to->iov[i].iov_base; 3034 result = snd_pcm_lib_readv(substream, bufs, frames); 3035 if (result > 0) 3036 result = frames_to_bytes(runtime, result); 3037 kfree(bufs); 3038 return result; 3039 } 3040 3041 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3042 { 3043 struct snd_pcm_file *pcm_file; 3044 struct snd_pcm_substream *substream; 3045 struct snd_pcm_runtime *runtime; 3046 snd_pcm_sframes_t result; 3047 unsigned long i; 3048 void __user **bufs; 3049 snd_pcm_uframes_t frames; 3050 3051 pcm_file = iocb->ki_filp->private_data; 3052 substream = pcm_file->substream; 3053 if (PCM_RUNTIME_CHECK(substream)) 3054 return -ENXIO; 3055 runtime = substream->runtime; 3056 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3057 return -EBADFD; 3058 if (!iter_is_iovec(from)) 3059 return -EINVAL; 3060 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3061 !frame_aligned(runtime, from->iov->iov_len)) 3062 return -EINVAL; 3063 frames = bytes_to_samples(runtime, from->iov->iov_len); 3064 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3065 if (bufs == NULL) 3066 return -ENOMEM; 3067 for (i = 0; i < from->nr_segs; ++i) 3068 bufs[i] = from->iov[i].iov_base; 3069 result = snd_pcm_lib_writev(substream, bufs, frames); 3070 if (result > 0) 3071 result = frames_to_bytes(runtime, result); 3072 kfree(bufs); 3073 return result; 3074 } 3075 3076 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3077 { 3078 struct snd_pcm_file *pcm_file; 3079 struct snd_pcm_substream *substream; 3080 struct snd_pcm_runtime *runtime; 3081 unsigned int mask; 3082 snd_pcm_uframes_t avail; 3083 3084 pcm_file = file->private_data; 3085 3086 substream = pcm_file->substream; 3087 if (PCM_RUNTIME_CHECK(substream)) 3088 return POLLOUT | POLLWRNORM | POLLERR; 3089 runtime = substream->runtime; 3090 3091 poll_wait(file, &runtime->sleep, wait); 3092 3093 snd_pcm_stream_lock_irq(substream); 3094 avail = snd_pcm_playback_avail(runtime); 3095 switch (runtime->status->state) { 3096 case SNDRV_PCM_STATE_RUNNING: 3097 case SNDRV_PCM_STATE_PREPARED: 3098 case SNDRV_PCM_STATE_PAUSED: 3099 if (avail >= runtime->control->avail_min) { 3100 mask = POLLOUT | POLLWRNORM; 3101 break; 3102 } 3103 /* Fall through */ 3104 case SNDRV_PCM_STATE_DRAINING: 3105 mask = 0; 3106 break; 3107 default: 3108 mask = POLLOUT | POLLWRNORM | POLLERR; 3109 break; 3110 } 3111 snd_pcm_stream_unlock_irq(substream); 3112 return mask; 3113 } 3114 3115 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3116 { 3117 struct snd_pcm_file *pcm_file; 3118 struct snd_pcm_substream *substream; 3119 struct snd_pcm_runtime *runtime; 3120 unsigned int mask; 3121 snd_pcm_uframes_t avail; 3122 3123 pcm_file = file->private_data; 3124 3125 substream = pcm_file->substream; 3126 if (PCM_RUNTIME_CHECK(substream)) 3127 return POLLIN | POLLRDNORM | POLLERR; 3128 runtime = substream->runtime; 3129 3130 poll_wait(file, &runtime->sleep, wait); 3131 3132 snd_pcm_stream_lock_irq(substream); 3133 avail = snd_pcm_capture_avail(runtime); 3134 switch (runtime->status->state) { 3135 case SNDRV_PCM_STATE_RUNNING: 3136 case SNDRV_PCM_STATE_PREPARED: 3137 case SNDRV_PCM_STATE_PAUSED: 3138 if (avail >= runtime->control->avail_min) { 3139 mask = POLLIN | POLLRDNORM; 3140 break; 3141 } 3142 mask = 0; 3143 break; 3144 case SNDRV_PCM_STATE_DRAINING: 3145 if (avail > 0) { 3146 mask = POLLIN | POLLRDNORM; 3147 break; 3148 } 3149 /* Fall through */ 3150 default: 3151 mask = POLLIN | POLLRDNORM | POLLERR; 3152 break; 3153 } 3154 snd_pcm_stream_unlock_irq(substream); 3155 return mask; 3156 } 3157 3158 /* 3159 * mmap support 3160 */ 3161 3162 /* 3163 * Only on coherent architectures, we can mmap the status and the control records 3164 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3165 */ 3166 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3167 /* 3168 * mmap status record 3169 */ 3170 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3171 { 3172 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3173 struct snd_pcm_runtime *runtime; 3174 3175 if (substream == NULL) 3176 return VM_FAULT_SIGBUS; 3177 runtime = substream->runtime; 3178 vmf->page = virt_to_page(runtime->status); 3179 get_page(vmf->page); 3180 return 0; 3181 } 3182 3183 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3184 { 3185 .fault = snd_pcm_mmap_status_fault, 3186 }; 3187 3188 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3189 struct vm_area_struct *area) 3190 { 3191 long size; 3192 if (!(area->vm_flags & VM_READ)) 3193 return -EINVAL; 3194 size = area->vm_end - area->vm_start; 3195 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3196 return -EINVAL; 3197 area->vm_ops = &snd_pcm_vm_ops_status; 3198 area->vm_private_data = substream; 3199 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3200 return 0; 3201 } 3202 3203 /* 3204 * mmap control record 3205 */ 3206 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3207 { 3208 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3209 struct snd_pcm_runtime *runtime; 3210 3211 if (substream == NULL) 3212 return VM_FAULT_SIGBUS; 3213 runtime = substream->runtime; 3214 vmf->page = virt_to_page(runtime->control); 3215 get_page(vmf->page); 3216 return 0; 3217 } 3218 3219 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3220 { 3221 .fault = snd_pcm_mmap_control_fault, 3222 }; 3223 3224 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3225 struct vm_area_struct *area) 3226 { 3227 long size; 3228 if (!(area->vm_flags & VM_READ)) 3229 return -EINVAL; 3230 size = area->vm_end - area->vm_start; 3231 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3232 return -EINVAL; 3233 area->vm_ops = &snd_pcm_vm_ops_control; 3234 area->vm_private_data = substream; 3235 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3236 return 0; 3237 } 3238 #else /* ! coherent mmap */ 3239 /* 3240 * don't support mmap for status and control records. 3241 */ 3242 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3243 struct vm_area_struct *area) 3244 { 3245 return -ENXIO; 3246 } 3247 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3248 struct vm_area_struct *area) 3249 { 3250 return -ENXIO; 3251 } 3252 #endif /* coherent mmap */ 3253 3254 static inline struct page * 3255 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3256 { 3257 void *vaddr = substream->runtime->dma_area + ofs; 3258 return virt_to_page(vaddr); 3259 } 3260 3261 /* 3262 * fault callback for mmapping a RAM page 3263 */ 3264 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3265 { 3266 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3267 struct snd_pcm_runtime *runtime; 3268 unsigned long offset; 3269 struct page * page; 3270 size_t dma_bytes; 3271 3272 if (substream == NULL) 3273 return VM_FAULT_SIGBUS; 3274 runtime = substream->runtime; 3275 offset = vmf->pgoff << PAGE_SHIFT; 3276 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3277 if (offset > dma_bytes - PAGE_SIZE) 3278 return VM_FAULT_SIGBUS; 3279 if (substream->ops->page) 3280 page = substream->ops->page(substream, offset); 3281 else 3282 page = snd_pcm_default_page_ops(substream, offset); 3283 if (!page) 3284 return VM_FAULT_SIGBUS; 3285 get_page(page); 3286 vmf->page = page; 3287 return 0; 3288 } 3289 3290 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3291 .open = snd_pcm_mmap_data_open, 3292 .close = snd_pcm_mmap_data_close, 3293 }; 3294 3295 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3296 .open = snd_pcm_mmap_data_open, 3297 .close = snd_pcm_mmap_data_close, 3298 .fault = snd_pcm_mmap_data_fault, 3299 }; 3300 3301 /* 3302 * mmap the DMA buffer on RAM 3303 */ 3304 3305 /** 3306 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3307 * @substream: PCM substream 3308 * @area: VMA 3309 * 3310 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3311 * this function is invoked implicitly. 3312 */ 3313 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3314 struct vm_area_struct *area) 3315 { 3316 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3317 #ifdef CONFIG_GENERIC_ALLOCATOR 3318 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3319 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3320 return remap_pfn_range(area, area->vm_start, 3321 substream->dma_buffer.addr >> PAGE_SHIFT, 3322 area->vm_end - area->vm_start, area->vm_page_prot); 3323 } 3324 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3325 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3326 if (!substream->ops->page && 3327 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3328 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3329 area, 3330 substream->runtime->dma_area, 3331 substream->runtime->dma_addr, 3332 area->vm_end - area->vm_start); 3333 #endif /* CONFIG_X86 */ 3334 /* mmap with fault handler */ 3335 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3336 return 0; 3337 } 3338 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3339 3340 /* 3341 * mmap the DMA buffer on I/O memory area 3342 */ 3343 #if SNDRV_PCM_INFO_MMAP_IOMEM 3344 /** 3345 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3346 * @substream: PCM substream 3347 * @area: VMA 3348 * 3349 * When your hardware uses the iomapped pages as the hardware buffer and 3350 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3351 * is supposed to work only on limited architectures. 3352 */ 3353 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3354 struct vm_area_struct *area) 3355 { 3356 struct snd_pcm_runtime *runtime = substream->runtime;; 3357 3358 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3359 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3360 } 3361 3362 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3363 #endif /* SNDRV_PCM_INFO_MMAP */ 3364 3365 /* 3366 * mmap DMA buffer 3367 */ 3368 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3369 struct vm_area_struct *area) 3370 { 3371 struct snd_pcm_runtime *runtime; 3372 long size; 3373 unsigned long offset; 3374 size_t dma_bytes; 3375 int err; 3376 3377 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3378 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3379 return -EINVAL; 3380 } else { 3381 if (!(area->vm_flags & VM_READ)) 3382 return -EINVAL; 3383 } 3384 runtime = substream->runtime; 3385 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3386 return -EBADFD; 3387 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3388 return -ENXIO; 3389 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3390 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3391 return -EINVAL; 3392 size = area->vm_end - area->vm_start; 3393 offset = area->vm_pgoff << PAGE_SHIFT; 3394 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3395 if ((size_t)size > dma_bytes) 3396 return -EINVAL; 3397 if (offset > dma_bytes - size) 3398 return -EINVAL; 3399 3400 area->vm_ops = &snd_pcm_vm_ops_data; 3401 area->vm_private_data = substream; 3402 if (substream->ops->mmap) 3403 err = substream->ops->mmap(substream, area); 3404 else 3405 err = snd_pcm_lib_default_mmap(substream, area); 3406 if (!err) 3407 atomic_inc(&substream->mmap_count); 3408 return err; 3409 } 3410 3411 EXPORT_SYMBOL(snd_pcm_mmap_data); 3412 3413 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3414 { 3415 struct snd_pcm_file * pcm_file; 3416 struct snd_pcm_substream *substream; 3417 unsigned long offset; 3418 3419 pcm_file = file->private_data; 3420 substream = pcm_file->substream; 3421 if (PCM_RUNTIME_CHECK(substream)) 3422 return -ENXIO; 3423 3424 offset = area->vm_pgoff << PAGE_SHIFT; 3425 switch (offset) { 3426 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3427 if (pcm_file->no_compat_mmap) 3428 return -ENXIO; 3429 return snd_pcm_mmap_status(substream, file, area); 3430 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3431 if (pcm_file->no_compat_mmap) 3432 return -ENXIO; 3433 return snd_pcm_mmap_control(substream, file, area); 3434 default: 3435 return snd_pcm_mmap_data(substream, file, area); 3436 } 3437 return 0; 3438 } 3439 3440 static int snd_pcm_fasync(int fd, struct file * file, int on) 3441 { 3442 struct snd_pcm_file * pcm_file; 3443 struct snd_pcm_substream *substream; 3444 struct snd_pcm_runtime *runtime; 3445 3446 pcm_file = file->private_data; 3447 substream = pcm_file->substream; 3448 if (PCM_RUNTIME_CHECK(substream)) 3449 return -ENXIO; 3450 runtime = substream->runtime; 3451 return fasync_helper(fd, file, on, &runtime->fasync); 3452 } 3453 3454 /* 3455 * ioctl32 compat 3456 */ 3457 #ifdef CONFIG_COMPAT 3458 #include "pcm_compat.c" 3459 #else 3460 #define snd_pcm_ioctl_compat NULL 3461 #endif 3462 3463 /* 3464 * To be removed helpers to keep binary compatibility 3465 */ 3466 3467 #ifdef CONFIG_SND_SUPPORT_OLD_API 3468 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3469 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3470 3471 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3472 struct snd_pcm_hw_params_old *oparams) 3473 { 3474 unsigned int i; 3475 3476 memset(params, 0, sizeof(*params)); 3477 params->flags = oparams->flags; 3478 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3479 params->masks[i].bits[0] = oparams->masks[i]; 3480 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3481 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3482 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3483 params->info = oparams->info; 3484 params->msbits = oparams->msbits; 3485 params->rate_num = oparams->rate_num; 3486 params->rate_den = oparams->rate_den; 3487 params->fifo_size = oparams->fifo_size; 3488 } 3489 3490 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3491 struct snd_pcm_hw_params *params) 3492 { 3493 unsigned int i; 3494 3495 memset(oparams, 0, sizeof(*oparams)); 3496 oparams->flags = params->flags; 3497 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3498 oparams->masks[i] = params->masks[i].bits[0]; 3499 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3500 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3501 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3502 oparams->info = params->info; 3503 oparams->msbits = params->msbits; 3504 oparams->rate_num = params->rate_num; 3505 oparams->rate_den = params->rate_den; 3506 oparams->fifo_size = params->fifo_size; 3507 } 3508 3509 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3510 struct snd_pcm_hw_params_old __user * _oparams) 3511 { 3512 struct snd_pcm_hw_params *params; 3513 struct snd_pcm_hw_params_old *oparams = NULL; 3514 int err; 3515 3516 params = kmalloc(sizeof(*params), GFP_KERNEL); 3517 if (!params) 3518 return -ENOMEM; 3519 3520 oparams = memdup_user(_oparams, sizeof(*oparams)); 3521 if (IS_ERR(oparams)) { 3522 err = PTR_ERR(oparams); 3523 goto out; 3524 } 3525 snd_pcm_hw_convert_from_old_params(params, oparams); 3526 err = snd_pcm_hw_refine(substream, params); 3527 snd_pcm_hw_convert_to_old_params(oparams, params); 3528 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3529 if (!err) 3530 err = -EFAULT; 3531 } 3532 3533 kfree(oparams); 3534 out: 3535 kfree(params); 3536 return err; 3537 } 3538 3539 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3540 struct snd_pcm_hw_params_old __user * _oparams) 3541 { 3542 struct snd_pcm_hw_params *params; 3543 struct snd_pcm_hw_params_old *oparams = NULL; 3544 int err; 3545 3546 params = kmalloc(sizeof(*params), GFP_KERNEL); 3547 if (!params) 3548 return -ENOMEM; 3549 3550 oparams = memdup_user(_oparams, sizeof(*oparams)); 3551 if (IS_ERR(oparams)) { 3552 err = PTR_ERR(oparams); 3553 goto out; 3554 } 3555 snd_pcm_hw_convert_from_old_params(params, oparams); 3556 err = snd_pcm_hw_params(substream, params); 3557 snd_pcm_hw_convert_to_old_params(oparams, params); 3558 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3559 if (!err) 3560 err = -EFAULT; 3561 } 3562 3563 kfree(oparams); 3564 out: 3565 kfree(params); 3566 return err; 3567 } 3568 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3569 3570 #ifndef CONFIG_MMU 3571 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3572 unsigned long addr, 3573 unsigned long len, 3574 unsigned long pgoff, 3575 unsigned long flags) 3576 { 3577 struct snd_pcm_file *pcm_file = file->private_data; 3578 struct snd_pcm_substream *substream = pcm_file->substream; 3579 struct snd_pcm_runtime *runtime = substream->runtime; 3580 unsigned long offset = pgoff << PAGE_SHIFT; 3581 3582 switch (offset) { 3583 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3584 return (unsigned long)runtime->status; 3585 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3586 return (unsigned long)runtime->control; 3587 default: 3588 return (unsigned long)runtime->dma_area + offset; 3589 } 3590 } 3591 #else 3592 # define snd_pcm_get_unmapped_area NULL 3593 #endif 3594 3595 /* 3596 * Register section 3597 */ 3598 3599 const struct file_operations snd_pcm_f_ops[2] = { 3600 { 3601 .owner = THIS_MODULE, 3602 .write = snd_pcm_write, 3603 .write_iter = snd_pcm_writev, 3604 .open = snd_pcm_playback_open, 3605 .release = snd_pcm_release, 3606 .llseek = no_llseek, 3607 .poll = snd_pcm_playback_poll, 3608 .unlocked_ioctl = snd_pcm_playback_ioctl, 3609 .compat_ioctl = snd_pcm_ioctl_compat, 3610 .mmap = snd_pcm_mmap, 3611 .fasync = snd_pcm_fasync, 3612 .get_unmapped_area = snd_pcm_get_unmapped_area, 3613 }, 3614 { 3615 .owner = THIS_MODULE, 3616 .read = snd_pcm_read, 3617 .read_iter = snd_pcm_readv, 3618 .open = snd_pcm_capture_open, 3619 .release = snd_pcm_release, 3620 .llseek = no_llseek, 3621 .poll = snd_pcm_capture_poll, 3622 .unlocked_ioctl = snd_pcm_capture_ioctl, 3623 .compat_ioctl = snd_pcm_ioctl_compat, 3624 .mmap = snd_pcm_mmap, 3625 .fasync = snd_pcm_fasync, 3626 .get_unmapped_area = snd_pcm_get_unmapped_area, 3627 } 3628 }; 3629