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 static int constrain_mask_params(struct snd_pcm_substream *substream, 257 struct snd_pcm_hw_params *params) 258 { 259 struct snd_pcm_hw_constraints *constrs = 260 &substream->runtime->hw_constraints; 261 struct snd_mask *m; 262 unsigned int k; 263 struct snd_mask old_mask; 264 int changed; 265 266 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 267 m = hw_param_mask(params, k); 268 if (snd_mask_empty(m)) 269 return -EINVAL; 270 if (!(params->rmask & (1 << k))) 271 continue; 272 273 if (trace_hw_mask_param_enabled()) 274 old_mask = *m; 275 276 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 277 278 trace_hw_mask_param(substream, k, 0, &old_mask, m); 279 280 if (changed) 281 params->cmask |= 1 << k; 282 if (changed < 0) 283 return changed; 284 } 285 286 return 0; 287 } 288 289 static int constrain_interval_params(struct snd_pcm_substream *substream, 290 struct snd_pcm_hw_params *params) 291 { 292 struct snd_pcm_hw_constraints *constrs = 293 &substream->runtime->hw_constraints; 294 struct snd_interval *i; 295 unsigned int k; 296 struct snd_interval old_interval; 297 int changed; 298 299 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 300 i = hw_param_interval(params, k); 301 if (snd_interval_empty(i)) 302 return -EINVAL; 303 if (!(params->rmask & (1 << k))) 304 continue; 305 306 if (trace_hw_interval_param_enabled()) 307 old_interval = *i; 308 309 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 310 311 trace_hw_interval_param(substream, k, 0, &old_interval, i); 312 313 if (changed) 314 params->cmask |= 1 << k; 315 if (changed < 0) 316 return changed; 317 } 318 319 return 0; 320 } 321 322 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 323 struct snd_pcm_hw_params *params) 324 { 325 struct snd_pcm_hw_constraints *constrs = 326 &substream->runtime->hw_constraints; 327 unsigned int k; 328 unsigned int rstamps[constrs->rules_num]; 329 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 330 unsigned int stamp = 2; 331 struct snd_mask old_mask; 332 struct snd_interval old_interval; 333 int again; 334 int changed; 335 336 for (k = 0; k < constrs->rules_num; k++) 337 rstamps[k] = 0; 338 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 339 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 340 retry: 341 again = 0; 342 for (k = 0; k < constrs->rules_num; k++) { 343 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 344 unsigned int d; 345 int doit = 0; 346 if (r->cond && !(r->cond & params->flags)) 347 continue; 348 for (d = 0; r->deps[d] >= 0; d++) { 349 if (vstamps[r->deps[d]] > rstamps[k]) { 350 doit = 1; 351 break; 352 } 353 } 354 if (!doit) 355 continue; 356 357 if (trace_hw_mask_param_enabled()) { 358 if (hw_is_mask(r->var)) 359 old_mask = *hw_param_mask(params, r->var); 360 } 361 if (trace_hw_interval_param_enabled()) { 362 if (hw_is_interval(r->var)) 363 old_interval = *hw_param_interval(params, r->var); 364 } 365 366 changed = r->func(params, r); 367 368 if (hw_is_mask(r->var)) { 369 trace_hw_mask_param(substream, r->var, k + 1, 370 &old_mask, hw_param_mask(params, r->var)); 371 } 372 if (hw_is_interval(r->var)) { 373 trace_hw_interval_param(substream, r->var, k + 1, 374 &old_interval, hw_param_interval(params, r->var)); 375 } 376 377 rstamps[k] = stamp; 378 if (changed && r->var >= 0) { 379 params->cmask |= (1 << r->var); 380 vstamps[r->var] = stamp; 381 again = 1; 382 } 383 if (changed < 0) 384 return changed; 385 stamp++; 386 } 387 388 if (again) 389 goto retry; 390 391 return 0; 392 } 393 394 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 395 struct snd_pcm_hw_params *params) 396 { 397 struct snd_pcm_hardware *hw; 398 struct snd_interval *i = NULL; 399 struct snd_mask *m = NULL; 400 int err; 401 402 params->info = 0; 403 params->fifo_size = 0; 404 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 405 params->msbits = 0; 406 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 407 params->rate_num = 0; 408 params->rate_den = 0; 409 } 410 411 err = constrain_mask_params(substream, params); 412 if (err < 0) 413 return err; 414 415 err = constrain_interval_params(substream, params); 416 if (err < 0) 417 return err; 418 419 err = constrain_params_by_rules(substream, params); 420 if (err < 0) 421 return err; 422 423 if (!params->msbits) { 424 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 425 if (snd_interval_single(i)) 426 params->msbits = snd_interval_value(i); 427 } 428 429 if (!params->rate_den) { 430 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 431 if (snd_interval_single(i)) { 432 params->rate_num = snd_interval_value(i); 433 params->rate_den = 1; 434 } 435 } 436 437 hw = &substream->runtime->hw; 438 if (!params->info) { 439 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 440 SNDRV_PCM_INFO_DRAIN_TRIGGER); 441 if (!hw_support_mmap(substream)) 442 params->info &= ~(SNDRV_PCM_INFO_MMAP | 443 SNDRV_PCM_INFO_MMAP_VALID); 444 } 445 if (!params->fifo_size) { 446 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 447 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 448 if (snd_mask_min(m) == snd_mask_max(m) && 449 snd_interval_min(i) == snd_interval_max(i)) { 450 err = substream->ops->ioctl(substream, 451 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 452 if (err < 0) 453 return err; 454 } 455 } 456 params->rmask = 0; 457 return 0; 458 } 459 460 EXPORT_SYMBOL(snd_pcm_hw_refine); 461 462 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 463 struct snd_pcm_hw_params __user * _params) 464 { 465 struct snd_pcm_hw_params *params; 466 int err; 467 468 params = memdup_user(_params, sizeof(*params)); 469 if (IS_ERR(params)) 470 return PTR_ERR(params); 471 472 err = snd_pcm_hw_refine(substream, params); 473 if (copy_to_user(_params, params, sizeof(*params))) { 474 if (!err) 475 err = -EFAULT; 476 } 477 478 kfree(params); 479 return err; 480 } 481 482 static int period_to_usecs(struct snd_pcm_runtime *runtime) 483 { 484 int usecs; 485 486 if (! runtime->rate) 487 return -1; /* invalid */ 488 489 /* take 75% of period time as the deadline */ 490 usecs = (750000 / runtime->rate) * runtime->period_size; 491 usecs += ((750000 % runtime->rate) * runtime->period_size) / 492 runtime->rate; 493 494 return usecs; 495 } 496 497 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 498 { 499 snd_pcm_stream_lock_irq(substream); 500 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 501 substream->runtime->status->state = state; 502 snd_pcm_stream_unlock_irq(substream); 503 } 504 505 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 506 int event) 507 { 508 #ifdef CONFIG_SND_PCM_TIMER 509 if (substream->timer) 510 snd_timer_notify(substream->timer, event, 511 &substream->runtime->trigger_tstamp); 512 #endif 513 } 514 515 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 516 struct snd_pcm_hw_params *params) 517 { 518 struct snd_pcm_runtime *runtime; 519 int err, usecs; 520 unsigned int bits; 521 snd_pcm_uframes_t frames; 522 523 if (PCM_RUNTIME_CHECK(substream)) 524 return -ENXIO; 525 runtime = substream->runtime; 526 snd_pcm_stream_lock_irq(substream); 527 switch (runtime->status->state) { 528 case SNDRV_PCM_STATE_OPEN: 529 case SNDRV_PCM_STATE_SETUP: 530 case SNDRV_PCM_STATE_PREPARED: 531 break; 532 default: 533 snd_pcm_stream_unlock_irq(substream); 534 return -EBADFD; 535 } 536 snd_pcm_stream_unlock_irq(substream); 537 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 538 if (!substream->oss.oss) 539 #endif 540 if (atomic_read(&substream->mmap_count)) 541 return -EBADFD; 542 543 params->rmask = ~0U; 544 err = snd_pcm_hw_refine(substream, params); 545 if (err < 0) 546 goto _error; 547 548 err = snd_pcm_hw_params_choose(substream, params); 549 if (err < 0) 550 goto _error; 551 552 if (substream->ops->hw_params != NULL) { 553 err = substream->ops->hw_params(substream, params); 554 if (err < 0) 555 goto _error; 556 } 557 558 runtime->access = params_access(params); 559 runtime->format = params_format(params); 560 runtime->subformat = params_subformat(params); 561 runtime->channels = params_channels(params); 562 runtime->rate = params_rate(params); 563 runtime->period_size = params_period_size(params); 564 runtime->periods = params_periods(params); 565 runtime->buffer_size = params_buffer_size(params); 566 runtime->info = params->info; 567 runtime->rate_num = params->rate_num; 568 runtime->rate_den = params->rate_den; 569 runtime->no_period_wakeup = 570 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 571 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 572 573 bits = snd_pcm_format_physical_width(runtime->format); 574 runtime->sample_bits = bits; 575 bits *= runtime->channels; 576 runtime->frame_bits = bits; 577 frames = 1; 578 while (bits % 8 != 0) { 579 bits *= 2; 580 frames *= 2; 581 } 582 runtime->byte_align = bits / 8; 583 runtime->min_align = frames; 584 585 /* Default sw params */ 586 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 587 runtime->period_step = 1; 588 runtime->control->avail_min = runtime->period_size; 589 runtime->start_threshold = 1; 590 runtime->stop_threshold = runtime->buffer_size; 591 runtime->silence_threshold = 0; 592 runtime->silence_size = 0; 593 runtime->boundary = runtime->buffer_size; 594 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 595 runtime->boundary *= 2; 596 597 snd_pcm_timer_resolution_change(substream); 598 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 599 600 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 601 pm_qos_remove_request(&substream->latency_pm_qos_req); 602 if ((usecs = period_to_usecs(runtime)) >= 0) 603 pm_qos_add_request(&substream->latency_pm_qos_req, 604 PM_QOS_CPU_DMA_LATENCY, usecs); 605 return 0; 606 _error: 607 /* hardware might be unusable from this time, 608 so we force application to retry to set 609 the correct hardware parameter settings */ 610 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 611 if (substream->ops->hw_free != NULL) 612 substream->ops->hw_free(substream); 613 return err; 614 } 615 616 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 617 struct snd_pcm_hw_params __user * _params) 618 { 619 struct snd_pcm_hw_params *params; 620 int err; 621 622 params = memdup_user(_params, sizeof(*params)); 623 if (IS_ERR(params)) 624 return PTR_ERR(params); 625 626 err = snd_pcm_hw_params(substream, params); 627 if (copy_to_user(_params, params, sizeof(*params))) { 628 if (!err) 629 err = -EFAULT; 630 } 631 632 kfree(params); 633 return err; 634 } 635 636 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 637 { 638 struct snd_pcm_runtime *runtime; 639 int result = 0; 640 641 if (PCM_RUNTIME_CHECK(substream)) 642 return -ENXIO; 643 runtime = substream->runtime; 644 snd_pcm_stream_lock_irq(substream); 645 switch (runtime->status->state) { 646 case SNDRV_PCM_STATE_SETUP: 647 case SNDRV_PCM_STATE_PREPARED: 648 break; 649 default: 650 snd_pcm_stream_unlock_irq(substream); 651 return -EBADFD; 652 } 653 snd_pcm_stream_unlock_irq(substream); 654 if (atomic_read(&substream->mmap_count)) 655 return -EBADFD; 656 if (substream->ops->hw_free) 657 result = substream->ops->hw_free(substream); 658 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 659 pm_qos_remove_request(&substream->latency_pm_qos_req); 660 return result; 661 } 662 663 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 664 struct snd_pcm_sw_params *params) 665 { 666 struct snd_pcm_runtime *runtime; 667 int err; 668 669 if (PCM_RUNTIME_CHECK(substream)) 670 return -ENXIO; 671 runtime = substream->runtime; 672 snd_pcm_stream_lock_irq(substream); 673 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 674 snd_pcm_stream_unlock_irq(substream); 675 return -EBADFD; 676 } 677 snd_pcm_stream_unlock_irq(substream); 678 679 if (params->tstamp_mode < 0 || 680 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 681 return -EINVAL; 682 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 683 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 684 return -EINVAL; 685 if (params->avail_min == 0) 686 return -EINVAL; 687 if (params->silence_size >= runtime->boundary) { 688 if (params->silence_threshold != 0) 689 return -EINVAL; 690 } else { 691 if (params->silence_size > params->silence_threshold) 692 return -EINVAL; 693 if (params->silence_threshold > runtime->buffer_size) 694 return -EINVAL; 695 } 696 err = 0; 697 snd_pcm_stream_lock_irq(substream); 698 runtime->tstamp_mode = params->tstamp_mode; 699 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 700 runtime->tstamp_type = params->tstamp_type; 701 runtime->period_step = params->period_step; 702 runtime->control->avail_min = params->avail_min; 703 runtime->start_threshold = params->start_threshold; 704 runtime->stop_threshold = params->stop_threshold; 705 runtime->silence_threshold = params->silence_threshold; 706 runtime->silence_size = params->silence_size; 707 params->boundary = runtime->boundary; 708 if (snd_pcm_running(substream)) { 709 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 710 runtime->silence_size > 0) 711 snd_pcm_playback_silence(substream, ULONG_MAX); 712 err = snd_pcm_update_state(substream, runtime); 713 } 714 snd_pcm_stream_unlock_irq(substream); 715 return err; 716 } 717 718 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 719 struct snd_pcm_sw_params __user * _params) 720 { 721 struct snd_pcm_sw_params params; 722 int err; 723 if (copy_from_user(¶ms, _params, sizeof(params))) 724 return -EFAULT; 725 err = snd_pcm_sw_params(substream, ¶ms); 726 if (copy_to_user(_params, ¶ms, sizeof(params))) 727 return -EFAULT; 728 return err; 729 } 730 731 int snd_pcm_status(struct snd_pcm_substream *substream, 732 struct snd_pcm_status *status) 733 { 734 struct snd_pcm_runtime *runtime = substream->runtime; 735 736 snd_pcm_stream_lock_irq(substream); 737 738 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 739 &runtime->audio_tstamp_config); 740 741 /* backwards compatible behavior */ 742 if (runtime->audio_tstamp_config.type_requested == 743 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 744 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 745 runtime->audio_tstamp_config.type_requested = 746 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 747 else 748 runtime->audio_tstamp_config.type_requested = 749 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 750 runtime->audio_tstamp_report.valid = 0; 751 } else 752 runtime->audio_tstamp_report.valid = 1; 753 754 status->state = runtime->status->state; 755 status->suspended_state = runtime->status->suspended_state; 756 if (status->state == SNDRV_PCM_STATE_OPEN) 757 goto _end; 758 status->trigger_tstamp = runtime->trigger_tstamp; 759 if (snd_pcm_running(substream)) { 760 snd_pcm_update_hw_ptr(substream); 761 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 762 status->tstamp = runtime->status->tstamp; 763 status->driver_tstamp = runtime->driver_tstamp; 764 status->audio_tstamp = 765 runtime->status->audio_tstamp; 766 if (runtime->audio_tstamp_report.valid == 1) 767 /* backwards compatibility, no report provided in COMPAT mode */ 768 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 769 &status->audio_tstamp_accuracy, 770 &runtime->audio_tstamp_report); 771 772 goto _tstamp_end; 773 } 774 } else { 775 /* get tstamp only in fallback mode and only if enabled */ 776 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 777 snd_pcm_gettime(runtime, &status->tstamp); 778 } 779 _tstamp_end: 780 status->appl_ptr = runtime->control->appl_ptr; 781 status->hw_ptr = runtime->status->hw_ptr; 782 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 783 status->avail = snd_pcm_playback_avail(runtime); 784 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 785 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 786 status->delay = runtime->buffer_size - status->avail; 787 status->delay += runtime->delay; 788 } else 789 status->delay = 0; 790 } else { 791 status->avail = snd_pcm_capture_avail(runtime); 792 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 793 status->delay = status->avail + runtime->delay; 794 else 795 status->delay = 0; 796 } 797 status->avail_max = runtime->avail_max; 798 status->overrange = runtime->overrange; 799 runtime->avail_max = 0; 800 runtime->overrange = 0; 801 _end: 802 snd_pcm_stream_unlock_irq(substream); 803 return 0; 804 } 805 806 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 807 struct snd_pcm_status __user * _status, 808 bool ext) 809 { 810 struct snd_pcm_status status; 811 int res; 812 813 memset(&status, 0, sizeof(status)); 814 /* 815 * with extension, parameters are read/write, 816 * get audio_tstamp_data from user, 817 * ignore rest of status structure 818 */ 819 if (ext && get_user(status.audio_tstamp_data, 820 (u32 __user *)(&_status->audio_tstamp_data))) 821 return -EFAULT; 822 res = snd_pcm_status(substream, &status); 823 if (res < 0) 824 return res; 825 if (copy_to_user(_status, &status, sizeof(status))) 826 return -EFAULT; 827 return 0; 828 } 829 830 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 831 struct snd_pcm_channel_info * info) 832 { 833 struct snd_pcm_runtime *runtime; 834 unsigned int channel; 835 836 channel = info->channel; 837 runtime = substream->runtime; 838 snd_pcm_stream_lock_irq(substream); 839 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 840 snd_pcm_stream_unlock_irq(substream); 841 return -EBADFD; 842 } 843 snd_pcm_stream_unlock_irq(substream); 844 if (channel >= runtime->channels) 845 return -EINVAL; 846 memset(info, 0, sizeof(*info)); 847 info->channel = channel; 848 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 849 } 850 851 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 852 struct snd_pcm_channel_info __user * _info) 853 { 854 struct snd_pcm_channel_info info; 855 int res; 856 857 if (copy_from_user(&info, _info, sizeof(info))) 858 return -EFAULT; 859 res = snd_pcm_channel_info(substream, &info); 860 if (res < 0) 861 return res; 862 if (copy_to_user(_info, &info, sizeof(info))) 863 return -EFAULT; 864 return 0; 865 } 866 867 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 868 { 869 struct snd_pcm_runtime *runtime = substream->runtime; 870 if (runtime->trigger_master == NULL) 871 return; 872 if (runtime->trigger_master == substream) { 873 if (!runtime->trigger_tstamp_latched) 874 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 875 } else { 876 snd_pcm_trigger_tstamp(runtime->trigger_master); 877 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 878 } 879 runtime->trigger_master = NULL; 880 } 881 882 struct action_ops { 883 int (*pre_action)(struct snd_pcm_substream *substream, int state); 884 int (*do_action)(struct snd_pcm_substream *substream, int state); 885 void (*undo_action)(struct snd_pcm_substream *substream, int state); 886 void (*post_action)(struct snd_pcm_substream *substream, int state); 887 }; 888 889 /* 890 * this functions is core for handling of linked stream 891 * Note: the stream state might be changed also on failure 892 * Note2: call with calling stream lock + link lock 893 */ 894 static int snd_pcm_action_group(const struct action_ops *ops, 895 struct snd_pcm_substream *substream, 896 int state, int do_lock) 897 { 898 struct snd_pcm_substream *s = NULL; 899 struct snd_pcm_substream *s1; 900 int res = 0, depth = 1; 901 902 snd_pcm_group_for_each_entry(s, substream) { 903 if (do_lock && s != substream) { 904 if (s->pcm->nonatomic) 905 mutex_lock_nested(&s->self_group.mutex, depth); 906 else 907 spin_lock_nested(&s->self_group.lock, depth); 908 depth++; 909 } 910 res = ops->pre_action(s, state); 911 if (res < 0) 912 goto _unlock; 913 } 914 snd_pcm_group_for_each_entry(s, substream) { 915 res = ops->do_action(s, state); 916 if (res < 0) { 917 if (ops->undo_action) { 918 snd_pcm_group_for_each_entry(s1, substream) { 919 if (s1 == s) /* failed stream */ 920 break; 921 ops->undo_action(s1, state); 922 } 923 } 924 s = NULL; /* unlock all */ 925 goto _unlock; 926 } 927 } 928 snd_pcm_group_for_each_entry(s, substream) { 929 ops->post_action(s, state); 930 } 931 _unlock: 932 if (do_lock) { 933 /* unlock streams */ 934 snd_pcm_group_for_each_entry(s1, substream) { 935 if (s1 != substream) { 936 if (s1->pcm->nonatomic) 937 mutex_unlock(&s1->self_group.mutex); 938 else 939 spin_unlock(&s1->self_group.lock); 940 } 941 if (s1 == s) /* end */ 942 break; 943 } 944 } 945 return res; 946 } 947 948 /* 949 * Note: call with stream lock 950 */ 951 static int snd_pcm_action_single(const struct action_ops *ops, 952 struct snd_pcm_substream *substream, 953 int state) 954 { 955 int res; 956 957 res = ops->pre_action(substream, state); 958 if (res < 0) 959 return res; 960 res = ops->do_action(substream, state); 961 if (res == 0) 962 ops->post_action(substream, state); 963 else if (ops->undo_action) 964 ops->undo_action(substream, state); 965 return res; 966 } 967 968 /* 969 * Note: call with stream lock 970 */ 971 static int snd_pcm_action(const struct action_ops *ops, 972 struct snd_pcm_substream *substream, 973 int state) 974 { 975 int res; 976 977 if (!snd_pcm_stream_linked(substream)) 978 return snd_pcm_action_single(ops, substream, state); 979 980 if (substream->pcm->nonatomic) { 981 if (!mutex_trylock(&substream->group->mutex)) { 982 mutex_unlock(&substream->self_group.mutex); 983 mutex_lock(&substream->group->mutex); 984 mutex_lock(&substream->self_group.mutex); 985 } 986 res = snd_pcm_action_group(ops, substream, state, 1); 987 mutex_unlock(&substream->group->mutex); 988 } else { 989 if (!spin_trylock(&substream->group->lock)) { 990 spin_unlock(&substream->self_group.lock); 991 spin_lock(&substream->group->lock); 992 spin_lock(&substream->self_group.lock); 993 } 994 res = snd_pcm_action_group(ops, substream, state, 1); 995 spin_unlock(&substream->group->lock); 996 } 997 return res; 998 } 999 1000 /* 1001 * Note: don't use any locks before 1002 */ 1003 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1004 struct snd_pcm_substream *substream, 1005 int state) 1006 { 1007 int res; 1008 1009 snd_pcm_stream_lock_irq(substream); 1010 res = snd_pcm_action(ops, substream, state); 1011 snd_pcm_stream_unlock_irq(substream); 1012 return res; 1013 } 1014 1015 /* 1016 */ 1017 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1018 struct snd_pcm_substream *substream, 1019 int state) 1020 { 1021 int res; 1022 1023 down_read(&snd_pcm_link_rwsem); 1024 if (snd_pcm_stream_linked(substream)) 1025 res = snd_pcm_action_group(ops, substream, state, 0); 1026 else 1027 res = snd_pcm_action_single(ops, substream, state); 1028 up_read(&snd_pcm_link_rwsem); 1029 return res; 1030 } 1031 1032 /* 1033 * start callbacks 1034 */ 1035 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1036 { 1037 struct snd_pcm_runtime *runtime = substream->runtime; 1038 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1039 return -EBADFD; 1040 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1041 !snd_pcm_playback_data(substream)) 1042 return -EPIPE; 1043 runtime->trigger_tstamp_latched = false; 1044 runtime->trigger_master = substream; 1045 return 0; 1046 } 1047 1048 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1049 { 1050 if (substream->runtime->trigger_master != substream) 1051 return 0; 1052 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1053 } 1054 1055 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1056 { 1057 if (substream->runtime->trigger_master == substream) 1058 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1059 } 1060 1061 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1062 { 1063 struct snd_pcm_runtime *runtime = substream->runtime; 1064 snd_pcm_trigger_tstamp(substream); 1065 runtime->hw_ptr_jiffies = jiffies; 1066 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1067 runtime->rate; 1068 runtime->status->state = state; 1069 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1070 runtime->silence_size > 0) 1071 snd_pcm_playback_silence(substream, ULONG_MAX); 1072 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1073 } 1074 1075 static const struct action_ops snd_pcm_action_start = { 1076 .pre_action = snd_pcm_pre_start, 1077 .do_action = snd_pcm_do_start, 1078 .undo_action = snd_pcm_undo_start, 1079 .post_action = snd_pcm_post_start 1080 }; 1081 1082 /** 1083 * snd_pcm_start - start all linked streams 1084 * @substream: the PCM substream instance 1085 * 1086 * Return: Zero if successful, or a negative error code. 1087 * The stream lock must be acquired before calling this function. 1088 */ 1089 int snd_pcm_start(struct snd_pcm_substream *substream) 1090 { 1091 return snd_pcm_action(&snd_pcm_action_start, substream, 1092 SNDRV_PCM_STATE_RUNNING); 1093 } 1094 1095 /* take the stream lock and start the streams */ 1096 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1097 { 1098 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1099 SNDRV_PCM_STATE_RUNNING); 1100 } 1101 1102 /* 1103 * stop callbacks 1104 */ 1105 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1106 { 1107 struct snd_pcm_runtime *runtime = substream->runtime; 1108 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1109 return -EBADFD; 1110 runtime->trigger_master = substream; 1111 return 0; 1112 } 1113 1114 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1115 { 1116 if (substream->runtime->trigger_master == substream && 1117 snd_pcm_running(substream)) 1118 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1119 return 0; /* unconditonally stop all substreams */ 1120 } 1121 1122 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1123 { 1124 struct snd_pcm_runtime *runtime = substream->runtime; 1125 if (runtime->status->state != state) { 1126 snd_pcm_trigger_tstamp(substream); 1127 runtime->status->state = state; 1128 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1129 } 1130 wake_up(&runtime->sleep); 1131 wake_up(&runtime->tsleep); 1132 } 1133 1134 static const struct action_ops snd_pcm_action_stop = { 1135 .pre_action = snd_pcm_pre_stop, 1136 .do_action = snd_pcm_do_stop, 1137 .post_action = snd_pcm_post_stop 1138 }; 1139 1140 /** 1141 * snd_pcm_stop - try to stop all running streams in the substream group 1142 * @substream: the PCM substream instance 1143 * @state: PCM state after stopping the stream 1144 * 1145 * The state of each stream is then changed to the given state unconditionally. 1146 * 1147 * Return: Zero if successful, or a negative error code. 1148 */ 1149 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1150 { 1151 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1152 } 1153 1154 EXPORT_SYMBOL(snd_pcm_stop); 1155 1156 /** 1157 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1158 * @substream: the PCM substream 1159 * 1160 * After stopping, the state is changed to SETUP. 1161 * Unlike snd_pcm_stop(), this affects only the given stream. 1162 * 1163 * Return: Zero if succesful, or a negative error code. 1164 */ 1165 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1166 { 1167 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1168 SNDRV_PCM_STATE_SETUP); 1169 } 1170 1171 /** 1172 * snd_pcm_stop_xrun - stop the running streams as XRUN 1173 * @substream: the PCM substream instance 1174 * 1175 * This stops the given running substream (and all linked substreams) as XRUN. 1176 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1177 * 1178 * Return: Zero if successful, or a negative error code. 1179 */ 1180 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1181 { 1182 unsigned long flags; 1183 int ret = 0; 1184 1185 snd_pcm_stream_lock_irqsave(substream, flags); 1186 if (snd_pcm_running(substream)) 1187 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1188 snd_pcm_stream_unlock_irqrestore(substream, flags); 1189 return ret; 1190 } 1191 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1192 1193 /* 1194 * pause callbacks 1195 */ 1196 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1197 { 1198 struct snd_pcm_runtime *runtime = substream->runtime; 1199 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1200 return -ENOSYS; 1201 if (push) { 1202 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1203 return -EBADFD; 1204 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1205 return -EBADFD; 1206 runtime->trigger_master = substream; 1207 return 0; 1208 } 1209 1210 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1211 { 1212 if (substream->runtime->trigger_master != substream) 1213 return 0; 1214 /* some drivers might use hw_ptr to recover from the pause - 1215 update the hw_ptr now */ 1216 if (push) 1217 snd_pcm_update_hw_ptr(substream); 1218 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1219 * a delta between the current jiffies, this gives a large enough 1220 * delta, effectively to skip the check once. 1221 */ 1222 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1223 return substream->ops->trigger(substream, 1224 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1225 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1226 } 1227 1228 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1229 { 1230 if (substream->runtime->trigger_master == substream) 1231 substream->ops->trigger(substream, 1232 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1233 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1234 } 1235 1236 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1237 { 1238 struct snd_pcm_runtime *runtime = substream->runtime; 1239 snd_pcm_trigger_tstamp(substream); 1240 if (push) { 1241 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1242 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1243 wake_up(&runtime->sleep); 1244 wake_up(&runtime->tsleep); 1245 } else { 1246 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1247 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1248 } 1249 } 1250 1251 static const struct action_ops snd_pcm_action_pause = { 1252 .pre_action = snd_pcm_pre_pause, 1253 .do_action = snd_pcm_do_pause, 1254 .undo_action = snd_pcm_undo_pause, 1255 .post_action = snd_pcm_post_pause 1256 }; 1257 1258 /* 1259 * Push/release the pause for all linked streams. 1260 */ 1261 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1262 { 1263 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1264 } 1265 1266 #ifdef CONFIG_PM 1267 /* suspend */ 1268 1269 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1270 { 1271 struct snd_pcm_runtime *runtime = substream->runtime; 1272 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1273 return -EBUSY; 1274 runtime->trigger_master = substream; 1275 return 0; 1276 } 1277 1278 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1279 { 1280 struct snd_pcm_runtime *runtime = substream->runtime; 1281 if (runtime->trigger_master != substream) 1282 return 0; 1283 if (! snd_pcm_running(substream)) 1284 return 0; 1285 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1286 return 0; /* suspend unconditionally */ 1287 } 1288 1289 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1290 { 1291 struct snd_pcm_runtime *runtime = substream->runtime; 1292 snd_pcm_trigger_tstamp(substream); 1293 runtime->status->suspended_state = runtime->status->state; 1294 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1295 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1296 wake_up(&runtime->sleep); 1297 wake_up(&runtime->tsleep); 1298 } 1299 1300 static const struct action_ops snd_pcm_action_suspend = { 1301 .pre_action = snd_pcm_pre_suspend, 1302 .do_action = snd_pcm_do_suspend, 1303 .post_action = snd_pcm_post_suspend 1304 }; 1305 1306 /** 1307 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1308 * @substream: the PCM substream 1309 * 1310 * After this call, all streams are changed to SUSPENDED state. 1311 * 1312 * Return: Zero if successful (or @substream is %NULL), or a negative error 1313 * code. 1314 */ 1315 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1316 { 1317 int err; 1318 unsigned long flags; 1319 1320 if (! substream) 1321 return 0; 1322 1323 snd_pcm_stream_lock_irqsave(substream, flags); 1324 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1325 snd_pcm_stream_unlock_irqrestore(substream, flags); 1326 return err; 1327 } 1328 1329 EXPORT_SYMBOL(snd_pcm_suspend); 1330 1331 /** 1332 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1333 * @pcm: the PCM instance 1334 * 1335 * After this call, all streams are changed to SUSPENDED state. 1336 * 1337 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1338 */ 1339 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1340 { 1341 struct snd_pcm_substream *substream; 1342 int stream, err = 0; 1343 1344 if (! pcm) 1345 return 0; 1346 1347 for (stream = 0; stream < 2; stream++) { 1348 for (substream = pcm->streams[stream].substream; 1349 substream; substream = substream->next) { 1350 /* FIXME: the open/close code should lock this as well */ 1351 if (substream->runtime == NULL) 1352 continue; 1353 err = snd_pcm_suspend(substream); 1354 if (err < 0 && err != -EBUSY) 1355 return err; 1356 } 1357 } 1358 return 0; 1359 } 1360 1361 EXPORT_SYMBOL(snd_pcm_suspend_all); 1362 1363 /* resume */ 1364 1365 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1366 { 1367 struct snd_pcm_runtime *runtime = substream->runtime; 1368 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1369 return -ENOSYS; 1370 runtime->trigger_master = substream; 1371 return 0; 1372 } 1373 1374 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1375 { 1376 struct snd_pcm_runtime *runtime = substream->runtime; 1377 if (runtime->trigger_master != substream) 1378 return 0; 1379 /* DMA not running previously? */ 1380 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1381 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1382 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1383 return 0; 1384 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1385 } 1386 1387 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1388 { 1389 if (substream->runtime->trigger_master == substream && 1390 snd_pcm_running(substream)) 1391 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1392 } 1393 1394 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1395 { 1396 struct snd_pcm_runtime *runtime = substream->runtime; 1397 snd_pcm_trigger_tstamp(substream); 1398 runtime->status->state = runtime->status->suspended_state; 1399 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1400 } 1401 1402 static const struct action_ops snd_pcm_action_resume = { 1403 .pre_action = snd_pcm_pre_resume, 1404 .do_action = snd_pcm_do_resume, 1405 .undo_action = snd_pcm_undo_resume, 1406 .post_action = snd_pcm_post_resume 1407 }; 1408 1409 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1410 { 1411 struct snd_card *card = substream->pcm->card; 1412 int res; 1413 1414 snd_power_lock(card); 1415 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1416 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1417 snd_power_unlock(card); 1418 return res; 1419 } 1420 1421 #else 1422 1423 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1424 { 1425 return -ENOSYS; 1426 } 1427 1428 #endif /* CONFIG_PM */ 1429 1430 /* 1431 * xrun ioctl 1432 * 1433 * Change the RUNNING stream(s) to XRUN state. 1434 */ 1435 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1436 { 1437 struct snd_card *card = substream->pcm->card; 1438 struct snd_pcm_runtime *runtime = substream->runtime; 1439 int result; 1440 1441 snd_power_lock(card); 1442 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1443 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1444 if (result < 0) 1445 goto _unlock; 1446 } 1447 1448 snd_pcm_stream_lock_irq(substream); 1449 switch (runtime->status->state) { 1450 case SNDRV_PCM_STATE_XRUN: 1451 result = 0; /* already there */ 1452 break; 1453 case SNDRV_PCM_STATE_RUNNING: 1454 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1455 break; 1456 default: 1457 result = -EBADFD; 1458 } 1459 snd_pcm_stream_unlock_irq(substream); 1460 _unlock: 1461 snd_power_unlock(card); 1462 return result; 1463 } 1464 1465 /* 1466 * reset ioctl 1467 */ 1468 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1469 { 1470 struct snd_pcm_runtime *runtime = substream->runtime; 1471 switch (runtime->status->state) { 1472 case SNDRV_PCM_STATE_RUNNING: 1473 case SNDRV_PCM_STATE_PREPARED: 1474 case SNDRV_PCM_STATE_PAUSED: 1475 case SNDRV_PCM_STATE_SUSPENDED: 1476 return 0; 1477 default: 1478 return -EBADFD; 1479 } 1480 } 1481 1482 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1483 { 1484 struct snd_pcm_runtime *runtime = substream->runtime; 1485 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1486 if (err < 0) 1487 return err; 1488 runtime->hw_ptr_base = 0; 1489 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1490 runtime->status->hw_ptr % runtime->period_size; 1491 runtime->silence_start = runtime->status->hw_ptr; 1492 runtime->silence_filled = 0; 1493 return 0; 1494 } 1495 1496 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1497 { 1498 struct snd_pcm_runtime *runtime = substream->runtime; 1499 runtime->control->appl_ptr = runtime->status->hw_ptr; 1500 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1501 runtime->silence_size > 0) 1502 snd_pcm_playback_silence(substream, ULONG_MAX); 1503 } 1504 1505 static const struct action_ops snd_pcm_action_reset = { 1506 .pre_action = snd_pcm_pre_reset, 1507 .do_action = snd_pcm_do_reset, 1508 .post_action = snd_pcm_post_reset 1509 }; 1510 1511 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1512 { 1513 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1514 } 1515 1516 /* 1517 * prepare ioctl 1518 */ 1519 /* we use the second argument for updating f_flags */ 1520 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1521 int f_flags) 1522 { 1523 struct snd_pcm_runtime *runtime = substream->runtime; 1524 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1525 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1526 return -EBADFD; 1527 if (snd_pcm_running(substream)) 1528 return -EBUSY; 1529 substream->f_flags = f_flags; 1530 return 0; 1531 } 1532 1533 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1534 { 1535 int err; 1536 err = substream->ops->prepare(substream); 1537 if (err < 0) 1538 return err; 1539 return snd_pcm_do_reset(substream, 0); 1540 } 1541 1542 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1543 { 1544 struct snd_pcm_runtime *runtime = substream->runtime; 1545 runtime->control->appl_ptr = runtime->status->hw_ptr; 1546 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1547 } 1548 1549 static const struct action_ops snd_pcm_action_prepare = { 1550 .pre_action = snd_pcm_pre_prepare, 1551 .do_action = snd_pcm_do_prepare, 1552 .post_action = snd_pcm_post_prepare 1553 }; 1554 1555 /** 1556 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1557 * @substream: the PCM substream instance 1558 * @file: file to refer f_flags 1559 * 1560 * Return: Zero if successful, or a negative error code. 1561 */ 1562 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1563 struct file *file) 1564 { 1565 int res; 1566 struct snd_card *card = substream->pcm->card; 1567 int f_flags; 1568 1569 if (file) 1570 f_flags = file->f_flags; 1571 else 1572 f_flags = substream->f_flags; 1573 1574 snd_power_lock(card); 1575 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1576 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1577 substream, f_flags); 1578 snd_power_unlock(card); 1579 return res; 1580 } 1581 1582 /* 1583 * drain ioctl 1584 */ 1585 1586 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1587 { 1588 struct snd_pcm_runtime *runtime = substream->runtime; 1589 switch (runtime->status->state) { 1590 case SNDRV_PCM_STATE_OPEN: 1591 case SNDRV_PCM_STATE_DISCONNECTED: 1592 case SNDRV_PCM_STATE_SUSPENDED: 1593 return -EBADFD; 1594 } 1595 runtime->trigger_master = substream; 1596 return 0; 1597 } 1598 1599 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1600 { 1601 struct snd_pcm_runtime *runtime = substream->runtime; 1602 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1603 switch (runtime->status->state) { 1604 case SNDRV_PCM_STATE_PREPARED: 1605 /* start playback stream if possible */ 1606 if (! snd_pcm_playback_empty(substream)) { 1607 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1608 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1609 } else { 1610 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1611 } 1612 break; 1613 case SNDRV_PCM_STATE_RUNNING: 1614 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1615 break; 1616 case SNDRV_PCM_STATE_XRUN: 1617 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1618 break; 1619 default: 1620 break; 1621 } 1622 } else { 1623 /* stop running stream */ 1624 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1625 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1626 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1627 snd_pcm_do_stop(substream, new_state); 1628 snd_pcm_post_stop(substream, new_state); 1629 } 1630 } 1631 1632 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1633 runtime->trigger_master == substream && 1634 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1635 return substream->ops->trigger(substream, 1636 SNDRV_PCM_TRIGGER_DRAIN); 1637 1638 return 0; 1639 } 1640 1641 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1642 { 1643 } 1644 1645 static const struct action_ops snd_pcm_action_drain_init = { 1646 .pre_action = snd_pcm_pre_drain_init, 1647 .do_action = snd_pcm_do_drain_init, 1648 .post_action = snd_pcm_post_drain_init 1649 }; 1650 1651 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1652 1653 /* 1654 * Drain the stream(s). 1655 * When the substream is linked, sync until the draining of all playback streams 1656 * is finished. 1657 * After this call, all streams are supposed to be either SETUP or DRAINING 1658 * (capture only) state. 1659 */ 1660 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1661 struct file *file) 1662 { 1663 struct snd_card *card; 1664 struct snd_pcm_runtime *runtime; 1665 struct snd_pcm_substream *s; 1666 wait_queue_t wait; 1667 int result = 0; 1668 int nonblock = 0; 1669 1670 card = substream->pcm->card; 1671 runtime = substream->runtime; 1672 1673 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1674 return -EBADFD; 1675 1676 snd_power_lock(card); 1677 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1678 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1679 if (result < 0) { 1680 snd_power_unlock(card); 1681 return result; 1682 } 1683 } 1684 1685 if (file) { 1686 if (file->f_flags & O_NONBLOCK) 1687 nonblock = 1; 1688 } else if (substream->f_flags & O_NONBLOCK) 1689 nonblock = 1; 1690 1691 down_read(&snd_pcm_link_rwsem); 1692 snd_pcm_stream_lock_irq(substream); 1693 /* resume pause */ 1694 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1695 snd_pcm_pause(substream, 0); 1696 1697 /* pre-start/stop - all running streams are changed to DRAINING state */ 1698 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1699 if (result < 0) 1700 goto unlock; 1701 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1702 if (nonblock) { 1703 result = -EAGAIN; 1704 goto unlock; 1705 } 1706 1707 for (;;) { 1708 long tout; 1709 struct snd_pcm_runtime *to_check; 1710 if (signal_pending(current)) { 1711 result = -ERESTARTSYS; 1712 break; 1713 } 1714 /* find a substream to drain */ 1715 to_check = NULL; 1716 snd_pcm_group_for_each_entry(s, substream) { 1717 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1718 continue; 1719 runtime = s->runtime; 1720 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1721 to_check = runtime; 1722 break; 1723 } 1724 } 1725 if (!to_check) 1726 break; /* all drained */ 1727 init_waitqueue_entry(&wait, current); 1728 add_wait_queue(&to_check->sleep, &wait); 1729 snd_pcm_stream_unlock_irq(substream); 1730 up_read(&snd_pcm_link_rwsem); 1731 snd_power_unlock(card); 1732 if (runtime->no_period_wakeup) 1733 tout = MAX_SCHEDULE_TIMEOUT; 1734 else { 1735 tout = 10; 1736 if (runtime->rate) { 1737 long t = runtime->period_size * 2 / runtime->rate; 1738 tout = max(t, tout); 1739 } 1740 tout = msecs_to_jiffies(tout * 1000); 1741 } 1742 tout = schedule_timeout_interruptible(tout); 1743 snd_power_lock(card); 1744 down_read(&snd_pcm_link_rwsem); 1745 snd_pcm_stream_lock_irq(substream); 1746 remove_wait_queue(&to_check->sleep, &wait); 1747 if (card->shutdown) { 1748 result = -ENODEV; 1749 break; 1750 } 1751 if (tout == 0) { 1752 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1753 result = -ESTRPIPE; 1754 else { 1755 dev_dbg(substream->pcm->card->dev, 1756 "playback drain error (DMA or IRQ trouble?)\n"); 1757 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1758 result = -EIO; 1759 } 1760 break; 1761 } 1762 } 1763 1764 unlock: 1765 snd_pcm_stream_unlock_irq(substream); 1766 up_read(&snd_pcm_link_rwsem); 1767 snd_power_unlock(card); 1768 1769 return result; 1770 } 1771 1772 /* 1773 * drop ioctl 1774 * 1775 * Immediately put all linked substreams into SETUP state. 1776 */ 1777 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1778 { 1779 struct snd_pcm_runtime *runtime; 1780 int result = 0; 1781 1782 if (PCM_RUNTIME_CHECK(substream)) 1783 return -ENXIO; 1784 runtime = substream->runtime; 1785 1786 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1787 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1788 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1789 return -EBADFD; 1790 1791 snd_pcm_stream_lock_irq(substream); 1792 /* resume pause */ 1793 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1794 snd_pcm_pause(substream, 0); 1795 1796 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1797 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1798 snd_pcm_stream_unlock_irq(substream); 1799 1800 return result; 1801 } 1802 1803 1804 static bool is_pcm_file(struct file *file) 1805 { 1806 struct inode *inode = file_inode(file); 1807 unsigned int minor; 1808 1809 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1810 return false; 1811 minor = iminor(inode); 1812 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1813 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1814 } 1815 1816 /* 1817 * PCM link handling 1818 */ 1819 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1820 { 1821 int res = 0; 1822 struct snd_pcm_file *pcm_file; 1823 struct snd_pcm_substream *substream1; 1824 struct snd_pcm_group *group; 1825 struct fd f = fdget(fd); 1826 1827 if (!f.file) 1828 return -EBADFD; 1829 if (!is_pcm_file(f.file)) { 1830 res = -EBADFD; 1831 goto _badf; 1832 } 1833 pcm_file = f.file->private_data; 1834 substream1 = pcm_file->substream; 1835 group = kmalloc(sizeof(*group), GFP_KERNEL); 1836 if (!group) { 1837 res = -ENOMEM; 1838 goto _nolock; 1839 } 1840 down_write_nonblock(&snd_pcm_link_rwsem); 1841 write_lock_irq(&snd_pcm_link_rwlock); 1842 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1843 substream->runtime->status->state != substream1->runtime->status->state || 1844 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1845 res = -EBADFD; 1846 goto _end; 1847 } 1848 if (snd_pcm_stream_linked(substream1)) { 1849 res = -EALREADY; 1850 goto _end; 1851 } 1852 if (!snd_pcm_stream_linked(substream)) { 1853 substream->group = group; 1854 group = NULL; 1855 spin_lock_init(&substream->group->lock); 1856 mutex_init(&substream->group->mutex); 1857 INIT_LIST_HEAD(&substream->group->substreams); 1858 list_add_tail(&substream->link_list, &substream->group->substreams); 1859 substream->group->count = 1; 1860 } 1861 list_add_tail(&substream1->link_list, &substream->group->substreams); 1862 substream->group->count++; 1863 substream1->group = substream->group; 1864 _end: 1865 write_unlock_irq(&snd_pcm_link_rwlock); 1866 up_write(&snd_pcm_link_rwsem); 1867 _nolock: 1868 snd_card_unref(substream1->pcm->card); 1869 kfree(group); 1870 _badf: 1871 fdput(f); 1872 return res; 1873 } 1874 1875 static void relink_to_local(struct snd_pcm_substream *substream) 1876 { 1877 substream->group = &substream->self_group; 1878 INIT_LIST_HEAD(&substream->self_group.substreams); 1879 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1880 } 1881 1882 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1883 { 1884 struct snd_pcm_substream *s; 1885 int res = 0; 1886 1887 down_write_nonblock(&snd_pcm_link_rwsem); 1888 write_lock_irq(&snd_pcm_link_rwlock); 1889 if (!snd_pcm_stream_linked(substream)) { 1890 res = -EALREADY; 1891 goto _end; 1892 } 1893 list_del(&substream->link_list); 1894 substream->group->count--; 1895 if (substream->group->count == 1) { /* detach the last stream, too */ 1896 snd_pcm_group_for_each_entry(s, substream) { 1897 relink_to_local(s); 1898 break; 1899 } 1900 kfree(substream->group); 1901 } 1902 relink_to_local(substream); 1903 _end: 1904 write_unlock_irq(&snd_pcm_link_rwlock); 1905 up_write(&snd_pcm_link_rwsem); 1906 return res; 1907 } 1908 1909 /* 1910 * hw configurator 1911 */ 1912 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1913 struct snd_pcm_hw_rule *rule) 1914 { 1915 struct snd_interval t; 1916 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1917 hw_param_interval_c(params, rule->deps[1]), &t); 1918 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1919 } 1920 1921 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1922 struct snd_pcm_hw_rule *rule) 1923 { 1924 struct snd_interval t; 1925 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1926 hw_param_interval_c(params, rule->deps[1]), &t); 1927 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1928 } 1929 1930 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1931 struct snd_pcm_hw_rule *rule) 1932 { 1933 struct snd_interval t; 1934 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1935 hw_param_interval_c(params, rule->deps[1]), 1936 (unsigned long) rule->private, &t); 1937 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1938 } 1939 1940 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1941 struct snd_pcm_hw_rule *rule) 1942 { 1943 struct snd_interval t; 1944 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1945 (unsigned long) rule->private, 1946 hw_param_interval_c(params, rule->deps[1]), &t); 1947 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1948 } 1949 1950 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1951 struct snd_pcm_hw_rule *rule) 1952 { 1953 unsigned int k; 1954 const struct snd_interval *i = 1955 hw_param_interval_c(params, rule->deps[0]); 1956 struct snd_mask m; 1957 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1958 snd_mask_any(&m); 1959 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1960 int bits; 1961 if (! snd_mask_test(mask, k)) 1962 continue; 1963 bits = snd_pcm_format_physical_width(k); 1964 if (bits <= 0) 1965 continue; /* ignore invalid formats */ 1966 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1967 snd_mask_reset(&m, k); 1968 } 1969 return snd_mask_refine(mask, &m); 1970 } 1971 1972 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1973 struct snd_pcm_hw_rule *rule) 1974 { 1975 struct snd_interval t; 1976 unsigned int k; 1977 t.min = UINT_MAX; 1978 t.max = 0; 1979 t.openmin = 0; 1980 t.openmax = 0; 1981 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1982 int bits; 1983 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1984 continue; 1985 bits = snd_pcm_format_physical_width(k); 1986 if (bits <= 0) 1987 continue; /* ignore invalid formats */ 1988 if (t.min > (unsigned)bits) 1989 t.min = bits; 1990 if (t.max < (unsigned)bits) 1991 t.max = bits; 1992 } 1993 t.integer = 1; 1994 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1995 } 1996 1997 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1998 #error "Change this table" 1999 #endif 2000 2001 static const unsigned int rates[] = { 2002 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2003 48000, 64000, 88200, 96000, 176400, 192000 2004 }; 2005 2006 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2007 .count = ARRAY_SIZE(rates), 2008 .list = rates, 2009 }; 2010 2011 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2012 struct snd_pcm_hw_rule *rule) 2013 { 2014 struct snd_pcm_hardware *hw = rule->private; 2015 return snd_interval_list(hw_param_interval(params, rule->var), 2016 snd_pcm_known_rates.count, 2017 snd_pcm_known_rates.list, hw->rates); 2018 } 2019 2020 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2021 struct snd_pcm_hw_rule *rule) 2022 { 2023 struct snd_interval t; 2024 struct snd_pcm_substream *substream = rule->private; 2025 t.min = 0; 2026 t.max = substream->buffer_bytes_max; 2027 t.openmin = 0; 2028 t.openmax = 0; 2029 t.integer = 1; 2030 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2031 } 2032 2033 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2034 { 2035 struct snd_pcm_runtime *runtime = substream->runtime; 2036 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2037 int k, err; 2038 2039 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2040 snd_mask_any(constrs_mask(constrs, k)); 2041 } 2042 2043 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2044 snd_interval_any(constrs_interval(constrs, k)); 2045 } 2046 2047 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2048 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2049 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2050 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2051 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2052 2053 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2054 snd_pcm_hw_rule_format, NULL, 2055 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2056 if (err < 0) 2057 return err; 2058 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2059 snd_pcm_hw_rule_sample_bits, NULL, 2060 SNDRV_PCM_HW_PARAM_FORMAT, 2061 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2062 if (err < 0) 2063 return err; 2064 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2065 snd_pcm_hw_rule_div, NULL, 2066 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2067 if (err < 0) 2068 return err; 2069 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2070 snd_pcm_hw_rule_mul, NULL, 2071 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2072 if (err < 0) 2073 return err; 2074 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2075 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2076 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2077 if (err < 0) 2078 return err; 2079 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2080 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2081 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2082 if (err < 0) 2083 return err; 2084 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2085 snd_pcm_hw_rule_div, NULL, 2086 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2087 if (err < 0) 2088 return err; 2089 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2090 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2091 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2092 if (err < 0) 2093 return err; 2094 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2095 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2096 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2097 if (err < 0) 2098 return err; 2099 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2100 snd_pcm_hw_rule_div, NULL, 2101 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2102 if (err < 0) 2103 return err; 2104 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2105 snd_pcm_hw_rule_div, NULL, 2106 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2107 if (err < 0) 2108 return err; 2109 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2110 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2111 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2112 if (err < 0) 2113 return err; 2114 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2115 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2116 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2117 if (err < 0) 2118 return err; 2119 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2120 snd_pcm_hw_rule_mul, NULL, 2121 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2122 if (err < 0) 2123 return err; 2124 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2125 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2126 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2127 if (err < 0) 2128 return err; 2129 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2130 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2131 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2132 if (err < 0) 2133 return err; 2134 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2135 snd_pcm_hw_rule_muldivk, (void*) 8, 2136 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2137 if (err < 0) 2138 return err; 2139 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2140 snd_pcm_hw_rule_muldivk, (void*) 8, 2141 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2142 if (err < 0) 2143 return err; 2144 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2145 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2146 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2147 if (err < 0) 2148 return err; 2149 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2150 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2151 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2152 if (err < 0) 2153 return err; 2154 return 0; 2155 } 2156 2157 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2158 { 2159 struct snd_pcm_runtime *runtime = substream->runtime; 2160 struct snd_pcm_hardware *hw = &runtime->hw; 2161 int err; 2162 unsigned int mask = 0; 2163 2164 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2165 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2166 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2167 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2168 if (hw_support_mmap(substream)) { 2169 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2170 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2171 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2172 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2173 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2174 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2175 } 2176 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2177 if (err < 0) 2178 return err; 2179 2180 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2181 if (err < 0) 2182 return err; 2183 2184 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2185 if (err < 0) 2186 return err; 2187 2188 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2189 hw->channels_min, hw->channels_max); 2190 if (err < 0) 2191 return err; 2192 2193 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2194 hw->rate_min, hw->rate_max); 2195 if (err < 0) 2196 return err; 2197 2198 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2199 hw->period_bytes_min, hw->period_bytes_max); 2200 if (err < 0) 2201 return err; 2202 2203 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2204 hw->periods_min, hw->periods_max); 2205 if (err < 0) 2206 return err; 2207 2208 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2209 hw->period_bytes_min, hw->buffer_bytes_max); 2210 if (err < 0) 2211 return err; 2212 2213 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2214 snd_pcm_hw_rule_buffer_bytes_max, substream, 2215 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2216 if (err < 0) 2217 return err; 2218 2219 /* FIXME: remove */ 2220 if (runtime->dma_bytes) { 2221 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2222 if (err < 0) 2223 return err; 2224 } 2225 2226 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2227 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2228 snd_pcm_hw_rule_rate, hw, 2229 SNDRV_PCM_HW_PARAM_RATE, -1); 2230 if (err < 0) 2231 return err; 2232 } 2233 2234 /* FIXME: this belong to lowlevel */ 2235 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2236 2237 return 0; 2238 } 2239 2240 static void pcm_release_private(struct snd_pcm_substream *substream) 2241 { 2242 snd_pcm_unlink(substream); 2243 } 2244 2245 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2246 { 2247 substream->ref_count--; 2248 if (substream->ref_count > 0) 2249 return; 2250 2251 snd_pcm_drop(substream); 2252 if (substream->hw_opened) { 2253 if (substream->ops->hw_free && 2254 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2255 substream->ops->hw_free(substream); 2256 substream->ops->close(substream); 2257 substream->hw_opened = 0; 2258 } 2259 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2260 pm_qos_remove_request(&substream->latency_pm_qos_req); 2261 if (substream->pcm_release) { 2262 substream->pcm_release(substream); 2263 substream->pcm_release = NULL; 2264 } 2265 snd_pcm_detach_substream(substream); 2266 } 2267 2268 EXPORT_SYMBOL(snd_pcm_release_substream); 2269 2270 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2271 struct file *file, 2272 struct snd_pcm_substream **rsubstream) 2273 { 2274 struct snd_pcm_substream *substream; 2275 int err; 2276 2277 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2278 if (err < 0) 2279 return err; 2280 if (substream->ref_count > 1) { 2281 *rsubstream = substream; 2282 return 0; 2283 } 2284 2285 err = snd_pcm_hw_constraints_init(substream); 2286 if (err < 0) { 2287 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2288 goto error; 2289 } 2290 2291 if ((err = substream->ops->open(substream)) < 0) 2292 goto error; 2293 2294 substream->hw_opened = 1; 2295 2296 err = snd_pcm_hw_constraints_complete(substream); 2297 if (err < 0) { 2298 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2299 goto error; 2300 } 2301 2302 *rsubstream = substream; 2303 return 0; 2304 2305 error: 2306 snd_pcm_release_substream(substream); 2307 return err; 2308 } 2309 2310 EXPORT_SYMBOL(snd_pcm_open_substream); 2311 2312 static int snd_pcm_open_file(struct file *file, 2313 struct snd_pcm *pcm, 2314 int stream) 2315 { 2316 struct snd_pcm_file *pcm_file; 2317 struct snd_pcm_substream *substream; 2318 int err; 2319 2320 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2321 if (err < 0) 2322 return err; 2323 2324 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2325 if (pcm_file == NULL) { 2326 snd_pcm_release_substream(substream); 2327 return -ENOMEM; 2328 } 2329 pcm_file->substream = substream; 2330 if (substream->ref_count == 1) { 2331 substream->file = pcm_file; 2332 substream->pcm_release = pcm_release_private; 2333 } 2334 file->private_data = pcm_file; 2335 2336 return 0; 2337 } 2338 2339 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2340 { 2341 struct snd_pcm *pcm; 2342 int err = nonseekable_open(inode, file); 2343 if (err < 0) 2344 return err; 2345 pcm = snd_lookup_minor_data(iminor(inode), 2346 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2347 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2348 if (pcm) 2349 snd_card_unref(pcm->card); 2350 return err; 2351 } 2352 2353 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2354 { 2355 struct snd_pcm *pcm; 2356 int err = nonseekable_open(inode, file); 2357 if (err < 0) 2358 return err; 2359 pcm = snd_lookup_minor_data(iminor(inode), 2360 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2361 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2362 if (pcm) 2363 snd_card_unref(pcm->card); 2364 return err; 2365 } 2366 2367 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2368 { 2369 int err; 2370 wait_queue_t wait; 2371 2372 if (pcm == NULL) { 2373 err = -ENODEV; 2374 goto __error1; 2375 } 2376 err = snd_card_file_add(pcm->card, file); 2377 if (err < 0) 2378 goto __error1; 2379 if (!try_module_get(pcm->card->module)) { 2380 err = -EFAULT; 2381 goto __error2; 2382 } 2383 init_waitqueue_entry(&wait, current); 2384 add_wait_queue(&pcm->open_wait, &wait); 2385 mutex_lock(&pcm->open_mutex); 2386 while (1) { 2387 err = snd_pcm_open_file(file, pcm, stream); 2388 if (err >= 0) 2389 break; 2390 if (err == -EAGAIN) { 2391 if (file->f_flags & O_NONBLOCK) { 2392 err = -EBUSY; 2393 break; 2394 } 2395 } else 2396 break; 2397 set_current_state(TASK_INTERRUPTIBLE); 2398 mutex_unlock(&pcm->open_mutex); 2399 schedule(); 2400 mutex_lock(&pcm->open_mutex); 2401 if (pcm->card->shutdown) { 2402 err = -ENODEV; 2403 break; 2404 } 2405 if (signal_pending(current)) { 2406 err = -ERESTARTSYS; 2407 break; 2408 } 2409 } 2410 remove_wait_queue(&pcm->open_wait, &wait); 2411 mutex_unlock(&pcm->open_mutex); 2412 if (err < 0) 2413 goto __error; 2414 return err; 2415 2416 __error: 2417 module_put(pcm->card->module); 2418 __error2: 2419 snd_card_file_remove(pcm->card, file); 2420 __error1: 2421 return err; 2422 } 2423 2424 static int snd_pcm_release(struct inode *inode, struct file *file) 2425 { 2426 struct snd_pcm *pcm; 2427 struct snd_pcm_substream *substream; 2428 struct snd_pcm_file *pcm_file; 2429 2430 pcm_file = file->private_data; 2431 substream = pcm_file->substream; 2432 if (snd_BUG_ON(!substream)) 2433 return -ENXIO; 2434 pcm = substream->pcm; 2435 mutex_lock(&pcm->open_mutex); 2436 snd_pcm_release_substream(substream); 2437 kfree(pcm_file); 2438 mutex_unlock(&pcm->open_mutex); 2439 wake_up(&pcm->open_wait); 2440 module_put(pcm->card->module); 2441 snd_card_file_remove(pcm->card, file); 2442 return 0; 2443 } 2444 2445 /* check and update PCM state; return 0 or a negative error 2446 * call this inside PCM lock 2447 */ 2448 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2449 { 2450 switch (substream->runtime->status->state) { 2451 case SNDRV_PCM_STATE_DRAINING: 2452 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2453 return -EBADFD; 2454 /* Fall through */ 2455 case SNDRV_PCM_STATE_RUNNING: 2456 return snd_pcm_update_hw_ptr(substream); 2457 case SNDRV_PCM_STATE_PREPARED: 2458 case SNDRV_PCM_STATE_PAUSED: 2459 return 0; 2460 case SNDRV_PCM_STATE_SUSPENDED: 2461 return -ESTRPIPE; 2462 case SNDRV_PCM_STATE_XRUN: 2463 return -EPIPE; 2464 default: 2465 return -EBADFD; 2466 } 2467 } 2468 2469 /* update to the given appl_ptr and call ack callback if needed; 2470 * when an error is returned, take back to the original value 2471 */ 2472 static int apply_appl_ptr(struct snd_pcm_substream *substream, 2473 snd_pcm_uframes_t appl_ptr) 2474 { 2475 struct snd_pcm_runtime *runtime = substream->runtime; 2476 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr; 2477 int ret; 2478 2479 runtime->control->appl_ptr = appl_ptr; 2480 if (substream->ops->ack) { 2481 ret = substream->ops->ack(substream); 2482 if (ret < 0) { 2483 runtime->control->appl_ptr = old_appl_ptr; 2484 return ret; 2485 } 2486 } 2487 return 0; 2488 } 2489 2490 /* increase the appl_ptr; returns the processed frames or a negative error */ 2491 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2492 snd_pcm_uframes_t frames, 2493 snd_pcm_sframes_t avail) 2494 { 2495 struct snd_pcm_runtime *runtime = substream->runtime; 2496 snd_pcm_sframes_t appl_ptr; 2497 int ret; 2498 2499 if (avail <= 0) 2500 return 0; 2501 if (frames > (snd_pcm_uframes_t)avail) 2502 frames = avail; 2503 appl_ptr = runtime->control->appl_ptr + frames; 2504 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2505 appl_ptr -= runtime->boundary; 2506 ret = apply_appl_ptr(substream, appl_ptr); 2507 return ret < 0 ? ret : frames; 2508 } 2509 2510 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2511 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2512 snd_pcm_uframes_t frames, 2513 snd_pcm_sframes_t avail) 2514 { 2515 struct snd_pcm_runtime *runtime = substream->runtime; 2516 snd_pcm_sframes_t appl_ptr; 2517 int ret; 2518 2519 if (avail <= 0) 2520 return 0; 2521 if (frames > (snd_pcm_uframes_t)avail) 2522 frames = avail; 2523 appl_ptr = runtime->control->appl_ptr - frames; 2524 if (appl_ptr < 0) 2525 appl_ptr += runtime->boundary; 2526 ret = apply_appl_ptr(substream, appl_ptr); 2527 return ret < 0 ? ret : frames; 2528 } 2529 2530 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2531 snd_pcm_uframes_t frames) 2532 { 2533 struct snd_pcm_runtime *runtime = substream->runtime; 2534 snd_pcm_sframes_t ret; 2535 2536 if (frames == 0) 2537 return 0; 2538 2539 snd_pcm_stream_lock_irq(substream); 2540 ret = do_pcm_hwsync(substream); 2541 if (!ret) 2542 ret = rewind_appl_ptr(substream, frames, 2543 snd_pcm_playback_hw_avail(runtime)); 2544 snd_pcm_stream_unlock_irq(substream); 2545 return ret; 2546 } 2547 2548 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2549 snd_pcm_uframes_t frames) 2550 { 2551 struct snd_pcm_runtime *runtime = substream->runtime; 2552 snd_pcm_sframes_t ret; 2553 2554 if (frames == 0) 2555 return 0; 2556 2557 snd_pcm_stream_lock_irq(substream); 2558 ret = do_pcm_hwsync(substream); 2559 if (!ret) 2560 ret = rewind_appl_ptr(substream, frames, 2561 snd_pcm_capture_hw_avail(runtime)); 2562 snd_pcm_stream_unlock_irq(substream); 2563 return ret; 2564 } 2565 2566 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2567 snd_pcm_uframes_t frames) 2568 { 2569 struct snd_pcm_runtime *runtime = substream->runtime; 2570 snd_pcm_sframes_t ret; 2571 2572 if (frames == 0) 2573 return 0; 2574 2575 snd_pcm_stream_lock_irq(substream); 2576 ret = do_pcm_hwsync(substream); 2577 if (!ret) 2578 ret = forward_appl_ptr(substream, frames, 2579 snd_pcm_playback_avail(runtime)); 2580 snd_pcm_stream_unlock_irq(substream); 2581 return ret; 2582 } 2583 2584 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2585 snd_pcm_uframes_t frames) 2586 { 2587 struct snd_pcm_runtime *runtime = substream->runtime; 2588 snd_pcm_sframes_t ret; 2589 2590 if (frames == 0) 2591 return 0; 2592 2593 snd_pcm_stream_lock_irq(substream); 2594 ret = do_pcm_hwsync(substream); 2595 if (!ret) 2596 ret = forward_appl_ptr(substream, frames, 2597 snd_pcm_capture_avail(runtime)); 2598 snd_pcm_stream_unlock_irq(substream); 2599 return ret; 2600 } 2601 2602 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2603 { 2604 int err; 2605 2606 snd_pcm_stream_lock_irq(substream); 2607 err = do_pcm_hwsync(substream); 2608 snd_pcm_stream_unlock_irq(substream); 2609 return err; 2610 } 2611 2612 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2613 { 2614 struct snd_pcm_runtime *runtime = substream->runtime; 2615 int err; 2616 snd_pcm_sframes_t n = 0; 2617 2618 snd_pcm_stream_lock_irq(substream); 2619 err = do_pcm_hwsync(substream); 2620 if (!err) { 2621 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2622 n = snd_pcm_playback_hw_avail(runtime); 2623 else 2624 n = snd_pcm_capture_avail(runtime); 2625 n += runtime->delay; 2626 } 2627 snd_pcm_stream_unlock_irq(substream); 2628 return err < 0 ? err : n; 2629 } 2630 2631 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2632 struct snd_pcm_sync_ptr __user *_sync_ptr) 2633 { 2634 struct snd_pcm_runtime *runtime = substream->runtime; 2635 struct snd_pcm_sync_ptr sync_ptr; 2636 volatile struct snd_pcm_mmap_status *status; 2637 volatile struct snd_pcm_mmap_control *control; 2638 int err; 2639 2640 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2641 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2642 return -EFAULT; 2643 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2644 return -EFAULT; 2645 status = runtime->status; 2646 control = runtime->control; 2647 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2648 err = snd_pcm_hwsync(substream); 2649 if (err < 0) 2650 return err; 2651 } 2652 snd_pcm_stream_lock_irq(substream); 2653 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2654 err = apply_appl_ptr(substream, sync_ptr.c.control.appl_ptr); 2655 if (err < 0) { 2656 snd_pcm_stream_unlock_irq(substream); 2657 return err; 2658 } 2659 } else { 2660 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2661 } 2662 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2663 control->avail_min = sync_ptr.c.control.avail_min; 2664 else 2665 sync_ptr.c.control.avail_min = control->avail_min; 2666 sync_ptr.s.status.state = status->state; 2667 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2668 sync_ptr.s.status.tstamp = status->tstamp; 2669 sync_ptr.s.status.suspended_state = status->suspended_state; 2670 snd_pcm_stream_unlock_irq(substream); 2671 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2672 return -EFAULT; 2673 return 0; 2674 } 2675 2676 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2677 { 2678 struct snd_pcm_runtime *runtime = substream->runtime; 2679 int arg; 2680 2681 if (get_user(arg, _arg)) 2682 return -EFAULT; 2683 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2684 return -EINVAL; 2685 runtime->tstamp_type = arg; 2686 return 0; 2687 } 2688 2689 static int snd_pcm_common_ioctl1(struct file *file, 2690 struct snd_pcm_substream *substream, 2691 unsigned int cmd, void __user *arg) 2692 { 2693 switch (cmd) { 2694 case SNDRV_PCM_IOCTL_PVERSION: 2695 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2696 case SNDRV_PCM_IOCTL_INFO: 2697 return snd_pcm_info_user(substream, arg); 2698 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2699 return 0; 2700 case SNDRV_PCM_IOCTL_TTSTAMP: 2701 return snd_pcm_tstamp(substream, arg); 2702 case SNDRV_PCM_IOCTL_HW_REFINE: 2703 return snd_pcm_hw_refine_user(substream, arg); 2704 case SNDRV_PCM_IOCTL_HW_PARAMS: 2705 return snd_pcm_hw_params_user(substream, arg); 2706 case SNDRV_PCM_IOCTL_HW_FREE: 2707 return snd_pcm_hw_free(substream); 2708 case SNDRV_PCM_IOCTL_SW_PARAMS: 2709 return snd_pcm_sw_params_user(substream, arg); 2710 case SNDRV_PCM_IOCTL_STATUS: 2711 return snd_pcm_status_user(substream, arg, false); 2712 case SNDRV_PCM_IOCTL_STATUS_EXT: 2713 return snd_pcm_status_user(substream, arg, true); 2714 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2715 return snd_pcm_channel_info_user(substream, arg); 2716 case SNDRV_PCM_IOCTL_PREPARE: 2717 return snd_pcm_prepare(substream, file); 2718 case SNDRV_PCM_IOCTL_RESET: 2719 return snd_pcm_reset(substream); 2720 case SNDRV_PCM_IOCTL_START: 2721 return snd_pcm_start_lock_irq(substream); 2722 case SNDRV_PCM_IOCTL_LINK: 2723 return snd_pcm_link(substream, (int)(unsigned long) arg); 2724 case SNDRV_PCM_IOCTL_UNLINK: 2725 return snd_pcm_unlink(substream); 2726 case SNDRV_PCM_IOCTL_RESUME: 2727 return snd_pcm_resume(substream); 2728 case SNDRV_PCM_IOCTL_XRUN: 2729 return snd_pcm_xrun(substream); 2730 case SNDRV_PCM_IOCTL_HWSYNC: 2731 return snd_pcm_hwsync(substream); 2732 case SNDRV_PCM_IOCTL_DELAY: 2733 { 2734 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2735 snd_pcm_sframes_t __user *res = arg; 2736 2737 if (delay < 0) 2738 return delay; 2739 if (put_user(delay, res)) 2740 return -EFAULT; 2741 return 0; 2742 } 2743 case SNDRV_PCM_IOCTL_SYNC_PTR: 2744 return snd_pcm_sync_ptr(substream, arg); 2745 #ifdef CONFIG_SND_SUPPORT_OLD_API 2746 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2747 return snd_pcm_hw_refine_old_user(substream, arg); 2748 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2749 return snd_pcm_hw_params_old_user(substream, arg); 2750 #endif 2751 case SNDRV_PCM_IOCTL_DRAIN: 2752 return snd_pcm_drain(substream, file); 2753 case SNDRV_PCM_IOCTL_DROP: 2754 return snd_pcm_drop(substream); 2755 case SNDRV_PCM_IOCTL_PAUSE: 2756 { 2757 int res; 2758 snd_pcm_stream_lock_irq(substream); 2759 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2760 snd_pcm_stream_unlock_irq(substream); 2761 return res; 2762 } 2763 } 2764 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2765 return -ENOTTY; 2766 } 2767 2768 static int snd_pcm_playback_ioctl1(struct file *file, 2769 struct snd_pcm_substream *substream, 2770 unsigned int cmd, void __user *arg) 2771 { 2772 if (snd_BUG_ON(!substream)) 2773 return -ENXIO; 2774 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2775 return -EINVAL; 2776 switch (cmd) { 2777 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2778 { 2779 struct snd_xferi xferi; 2780 struct snd_xferi __user *_xferi = arg; 2781 struct snd_pcm_runtime *runtime = substream->runtime; 2782 snd_pcm_sframes_t result; 2783 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2784 return -EBADFD; 2785 if (put_user(0, &_xferi->result)) 2786 return -EFAULT; 2787 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2788 return -EFAULT; 2789 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2790 __put_user(result, &_xferi->result); 2791 return result < 0 ? result : 0; 2792 } 2793 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2794 { 2795 struct snd_xfern xfern; 2796 struct snd_xfern __user *_xfern = arg; 2797 struct snd_pcm_runtime *runtime = substream->runtime; 2798 void __user **bufs; 2799 snd_pcm_sframes_t result; 2800 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2801 return -EBADFD; 2802 if (runtime->channels > 128) 2803 return -EINVAL; 2804 if (put_user(0, &_xfern->result)) 2805 return -EFAULT; 2806 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2807 return -EFAULT; 2808 2809 bufs = memdup_user(xfern.bufs, 2810 sizeof(void *) * runtime->channels); 2811 if (IS_ERR(bufs)) 2812 return PTR_ERR(bufs); 2813 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2814 kfree(bufs); 2815 __put_user(result, &_xfern->result); 2816 return result < 0 ? result : 0; 2817 } 2818 case SNDRV_PCM_IOCTL_REWIND: 2819 { 2820 snd_pcm_uframes_t frames; 2821 snd_pcm_uframes_t __user *_frames = arg; 2822 snd_pcm_sframes_t result; 2823 if (get_user(frames, _frames)) 2824 return -EFAULT; 2825 if (put_user(0, _frames)) 2826 return -EFAULT; 2827 result = snd_pcm_playback_rewind(substream, frames); 2828 __put_user(result, _frames); 2829 return result < 0 ? result : 0; 2830 } 2831 case SNDRV_PCM_IOCTL_FORWARD: 2832 { 2833 snd_pcm_uframes_t frames; 2834 snd_pcm_uframes_t __user *_frames = arg; 2835 snd_pcm_sframes_t result; 2836 if (get_user(frames, _frames)) 2837 return -EFAULT; 2838 if (put_user(0, _frames)) 2839 return -EFAULT; 2840 result = snd_pcm_playback_forward(substream, frames); 2841 __put_user(result, _frames); 2842 return result < 0 ? result : 0; 2843 } 2844 } 2845 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2846 } 2847 2848 static int snd_pcm_capture_ioctl1(struct file *file, 2849 struct snd_pcm_substream *substream, 2850 unsigned int cmd, void __user *arg) 2851 { 2852 if (snd_BUG_ON(!substream)) 2853 return -ENXIO; 2854 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2855 return -EINVAL; 2856 switch (cmd) { 2857 case SNDRV_PCM_IOCTL_READI_FRAMES: 2858 { 2859 struct snd_xferi xferi; 2860 struct snd_xferi __user *_xferi = arg; 2861 struct snd_pcm_runtime *runtime = substream->runtime; 2862 snd_pcm_sframes_t result; 2863 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2864 return -EBADFD; 2865 if (put_user(0, &_xferi->result)) 2866 return -EFAULT; 2867 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2868 return -EFAULT; 2869 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2870 __put_user(result, &_xferi->result); 2871 return result < 0 ? result : 0; 2872 } 2873 case SNDRV_PCM_IOCTL_READN_FRAMES: 2874 { 2875 struct snd_xfern xfern; 2876 struct snd_xfern __user *_xfern = arg; 2877 struct snd_pcm_runtime *runtime = substream->runtime; 2878 void *bufs; 2879 snd_pcm_sframes_t result; 2880 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2881 return -EBADFD; 2882 if (runtime->channels > 128) 2883 return -EINVAL; 2884 if (put_user(0, &_xfern->result)) 2885 return -EFAULT; 2886 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2887 return -EFAULT; 2888 2889 bufs = memdup_user(xfern.bufs, 2890 sizeof(void *) * runtime->channels); 2891 if (IS_ERR(bufs)) 2892 return PTR_ERR(bufs); 2893 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2894 kfree(bufs); 2895 __put_user(result, &_xfern->result); 2896 return result < 0 ? result : 0; 2897 } 2898 case SNDRV_PCM_IOCTL_REWIND: 2899 { 2900 snd_pcm_uframes_t frames; 2901 snd_pcm_uframes_t __user *_frames = arg; 2902 snd_pcm_sframes_t result; 2903 if (get_user(frames, _frames)) 2904 return -EFAULT; 2905 if (put_user(0, _frames)) 2906 return -EFAULT; 2907 result = snd_pcm_capture_rewind(substream, frames); 2908 __put_user(result, _frames); 2909 return result < 0 ? result : 0; 2910 } 2911 case SNDRV_PCM_IOCTL_FORWARD: 2912 { 2913 snd_pcm_uframes_t frames; 2914 snd_pcm_uframes_t __user *_frames = arg; 2915 snd_pcm_sframes_t result; 2916 if (get_user(frames, _frames)) 2917 return -EFAULT; 2918 if (put_user(0, _frames)) 2919 return -EFAULT; 2920 result = snd_pcm_capture_forward(substream, frames); 2921 __put_user(result, _frames); 2922 return result < 0 ? result : 0; 2923 } 2924 } 2925 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2926 } 2927 2928 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2929 unsigned long arg) 2930 { 2931 struct snd_pcm_file *pcm_file; 2932 2933 pcm_file = file->private_data; 2934 2935 if (((cmd >> 8) & 0xff) != 'A') 2936 return -ENOTTY; 2937 2938 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2939 (void __user *)arg); 2940 } 2941 2942 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2943 unsigned long arg) 2944 { 2945 struct snd_pcm_file *pcm_file; 2946 2947 pcm_file = file->private_data; 2948 2949 if (((cmd >> 8) & 0xff) != 'A') 2950 return -ENOTTY; 2951 2952 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2953 (void __user *)arg); 2954 } 2955 2956 /** 2957 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2958 * @substream: PCM substream 2959 * @cmd: IOCTL cmd 2960 * @arg: IOCTL argument 2961 * 2962 * The function is provided primarily for OSS layer and USB gadget drivers, 2963 * and it allows only the limited set of ioctls (hw_params, sw_params, 2964 * prepare, start, drain, drop, forward). 2965 */ 2966 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2967 unsigned int cmd, void *arg) 2968 { 2969 snd_pcm_uframes_t *frames = arg; 2970 snd_pcm_sframes_t result; 2971 2972 switch (cmd) { 2973 case SNDRV_PCM_IOCTL_FORWARD: 2974 { 2975 /* provided only for OSS; capture-only and no value returned */ 2976 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 2977 return -EINVAL; 2978 result = snd_pcm_capture_forward(substream, *frames); 2979 return result < 0 ? result : 0; 2980 } 2981 case SNDRV_PCM_IOCTL_HW_PARAMS: 2982 return snd_pcm_hw_params(substream, arg); 2983 case SNDRV_PCM_IOCTL_SW_PARAMS: 2984 return snd_pcm_sw_params(substream, arg); 2985 case SNDRV_PCM_IOCTL_PREPARE: 2986 return snd_pcm_prepare(substream, NULL); 2987 case SNDRV_PCM_IOCTL_START: 2988 return snd_pcm_start_lock_irq(substream); 2989 case SNDRV_PCM_IOCTL_DRAIN: 2990 return snd_pcm_drain(substream, NULL); 2991 case SNDRV_PCM_IOCTL_DROP: 2992 return snd_pcm_drop(substream); 2993 case SNDRV_PCM_IOCTL_DELAY: 2994 { 2995 result = snd_pcm_delay(substream); 2996 if (result < 0) 2997 return result; 2998 *frames = result; 2999 return 0; 3000 } 3001 default: 3002 return -EINVAL; 3003 } 3004 } 3005 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3006 3007 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3008 loff_t * offset) 3009 { 3010 struct snd_pcm_file *pcm_file; 3011 struct snd_pcm_substream *substream; 3012 struct snd_pcm_runtime *runtime; 3013 snd_pcm_sframes_t result; 3014 3015 pcm_file = file->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 (!frame_aligned(runtime, count)) 3023 return -EINVAL; 3024 count = bytes_to_frames(runtime, count); 3025 result = snd_pcm_lib_read(substream, buf, count); 3026 if (result > 0) 3027 result = frames_to_bytes(runtime, result); 3028 return result; 3029 } 3030 3031 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3032 size_t count, loff_t * offset) 3033 { 3034 struct snd_pcm_file *pcm_file; 3035 struct snd_pcm_substream *substream; 3036 struct snd_pcm_runtime *runtime; 3037 snd_pcm_sframes_t result; 3038 3039 pcm_file = file->private_data; 3040 substream = pcm_file->substream; 3041 if (PCM_RUNTIME_CHECK(substream)) 3042 return -ENXIO; 3043 runtime = substream->runtime; 3044 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3045 return -EBADFD; 3046 if (!frame_aligned(runtime, count)) 3047 return -EINVAL; 3048 count = bytes_to_frames(runtime, count); 3049 result = snd_pcm_lib_write(substream, buf, count); 3050 if (result > 0) 3051 result = frames_to_bytes(runtime, result); 3052 return result; 3053 } 3054 3055 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3056 { 3057 struct snd_pcm_file *pcm_file; 3058 struct snd_pcm_substream *substream; 3059 struct snd_pcm_runtime *runtime; 3060 snd_pcm_sframes_t result; 3061 unsigned long i; 3062 void __user **bufs; 3063 snd_pcm_uframes_t frames; 3064 3065 pcm_file = iocb->ki_filp->private_data; 3066 substream = pcm_file->substream; 3067 if (PCM_RUNTIME_CHECK(substream)) 3068 return -ENXIO; 3069 runtime = substream->runtime; 3070 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3071 return -EBADFD; 3072 if (!iter_is_iovec(to)) 3073 return -EINVAL; 3074 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3075 return -EINVAL; 3076 if (!frame_aligned(runtime, to->iov->iov_len)) 3077 return -EINVAL; 3078 frames = bytes_to_samples(runtime, to->iov->iov_len); 3079 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3080 if (bufs == NULL) 3081 return -ENOMEM; 3082 for (i = 0; i < to->nr_segs; ++i) 3083 bufs[i] = to->iov[i].iov_base; 3084 result = snd_pcm_lib_readv(substream, bufs, frames); 3085 if (result > 0) 3086 result = frames_to_bytes(runtime, result); 3087 kfree(bufs); 3088 return result; 3089 } 3090 3091 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3092 { 3093 struct snd_pcm_file *pcm_file; 3094 struct snd_pcm_substream *substream; 3095 struct snd_pcm_runtime *runtime; 3096 snd_pcm_sframes_t result; 3097 unsigned long i; 3098 void __user **bufs; 3099 snd_pcm_uframes_t frames; 3100 3101 pcm_file = iocb->ki_filp->private_data; 3102 substream = pcm_file->substream; 3103 if (PCM_RUNTIME_CHECK(substream)) 3104 return -ENXIO; 3105 runtime = substream->runtime; 3106 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3107 return -EBADFD; 3108 if (!iter_is_iovec(from)) 3109 return -EINVAL; 3110 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3111 !frame_aligned(runtime, from->iov->iov_len)) 3112 return -EINVAL; 3113 frames = bytes_to_samples(runtime, from->iov->iov_len); 3114 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3115 if (bufs == NULL) 3116 return -ENOMEM; 3117 for (i = 0; i < from->nr_segs; ++i) 3118 bufs[i] = from->iov[i].iov_base; 3119 result = snd_pcm_lib_writev(substream, bufs, frames); 3120 if (result > 0) 3121 result = frames_to_bytes(runtime, result); 3122 kfree(bufs); 3123 return result; 3124 } 3125 3126 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3127 { 3128 struct snd_pcm_file *pcm_file; 3129 struct snd_pcm_substream *substream; 3130 struct snd_pcm_runtime *runtime; 3131 unsigned int mask; 3132 snd_pcm_uframes_t avail; 3133 3134 pcm_file = file->private_data; 3135 3136 substream = pcm_file->substream; 3137 if (PCM_RUNTIME_CHECK(substream)) 3138 return POLLOUT | POLLWRNORM | POLLERR; 3139 runtime = substream->runtime; 3140 3141 poll_wait(file, &runtime->sleep, wait); 3142 3143 snd_pcm_stream_lock_irq(substream); 3144 avail = snd_pcm_playback_avail(runtime); 3145 switch (runtime->status->state) { 3146 case SNDRV_PCM_STATE_RUNNING: 3147 case SNDRV_PCM_STATE_PREPARED: 3148 case SNDRV_PCM_STATE_PAUSED: 3149 if (avail >= runtime->control->avail_min) { 3150 mask = POLLOUT | POLLWRNORM; 3151 break; 3152 } 3153 /* Fall through */ 3154 case SNDRV_PCM_STATE_DRAINING: 3155 mask = 0; 3156 break; 3157 default: 3158 mask = POLLOUT | POLLWRNORM | POLLERR; 3159 break; 3160 } 3161 snd_pcm_stream_unlock_irq(substream); 3162 return mask; 3163 } 3164 3165 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3166 { 3167 struct snd_pcm_file *pcm_file; 3168 struct snd_pcm_substream *substream; 3169 struct snd_pcm_runtime *runtime; 3170 unsigned int mask; 3171 snd_pcm_uframes_t avail; 3172 3173 pcm_file = file->private_data; 3174 3175 substream = pcm_file->substream; 3176 if (PCM_RUNTIME_CHECK(substream)) 3177 return POLLIN | POLLRDNORM | POLLERR; 3178 runtime = substream->runtime; 3179 3180 poll_wait(file, &runtime->sleep, wait); 3181 3182 snd_pcm_stream_lock_irq(substream); 3183 avail = snd_pcm_capture_avail(runtime); 3184 switch (runtime->status->state) { 3185 case SNDRV_PCM_STATE_RUNNING: 3186 case SNDRV_PCM_STATE_PREPARED: 3187 case SNDRV_PCM_STATE_PAUSED: 3188 if (avail >= runtime->control->avail_min) { 3189 mask = POLLIN | POLLRDNORM; 3190 break; 3191 } 3192 mask = 0; 3193 break; 3194 case SNDRV_PCM_STATE_DRAINING: 3195 if (avail > 0) { 3196 mask = POLLIN | POLLRDNORM; 3197 break; 3198 } 3199 /* Fall through */ 3200 default: 3201 mask = POLLIN | POLLRDNORM | POLLERR; 3202 break; 3203 } 3204 snd_pcm_stream_unlock_irq(substream); 3205 return mask; 3206 } 3207 3208 /* 3209 * mmap support 3210 */ 3211 3212 /* 3213 * Only on coherent architectures, we can mmap the status and the control records 3214 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3215 */ 3216 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3217 /* 3218 * mmap status record 3219 */ 3220 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3221 { 3222 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3223 struct snd_pcm_runtime *runtime; 3224 3225 if (substream == NULL) 3226 return VM_FAULT_SIGBUS; 3227 runtime = substream->runtime; 3228 vmf->page = virt_to_page(runtime->status); 3229 get_page(vmf->page); 3230 return 0; 3231 } 3232 3233 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3234 { 3235 .fault = snd_pcm_mmap_status_fault, 3236 }; 3237 3238 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3239 struct vm_area_struct *area) 3240 { 3241 long size; 3242 if (!(area->vm_flags & VM_READ)) 3243 return -EINVAL; 3244 size = area->vm_end - area->vm_start; 3245 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3246 return -EINVAL; 3247 area->vm_ops = &snd_pcm_vm_ops_status; 3248 area->vm_private_data = substream; 3249 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3250 return 0; 3251 } 3252 3253 /* 3254 * mmap control record 3255 */ 3256 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3257 { 3258 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3259 struct snd_pcm_runtime *runtime; 3260 3261 if (substream == NULL) 3262 return VM_FAULT_SIGBUS; 3263 runtime = substream->runtime; 3264 vmf->page = virt_to_page(runtime->control); 3265 get_page(vmf->page); 3266 return 0; 3267 } 3268 3269 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3270 { 3271 .fault = snd_pcm_mmap_control_fault, 3272 }; 3273 3274 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3275 struct vm_area_struct *area) 3276 { 3277 long size; 3278 if (!(area->vm_flags & VM_READ)) 3279 return -EINVAL; 3280 size = area->vm_end - area->vm_start; 3281 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3282 return -EINVAL; 3283 area->vm_ops = &snd_pcm_vm_ops_control; 3284 area->vm_private_data = substream; 3285 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3286 return 0; 3287 } 3288 #else /* ! coherent mmap */ 3289 /* 3290 * don't support mmap for status and control records. 3291 */ 3292 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3293 struct vm_area_struct *area) 3294 { 3295 return -ENXIO; 3296 } 3297 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3298 struct vm_area_struct *area) 3299 { 3300 return -ENXIO; 3301 } 3302 #endif /* coherent mmap */ 3303 3304 static inline struct page * 3305 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3306 { 3307 void *vaddr = substream->runtime->dma_area + ofs; 3308 return virt_to_page(vaddr); 3309 } 3310 3311 /* 3312 * fault callback for mmapping a RAM page 3313 */ 3314 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3315 { 3316 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3317 struct snd_pcm_runtime *runtime; 3318 unsigned long offset; 3319 struct page * page; 3320 size_t dma_bytes; 3321 3322 if (substream == NULL) 3323 return VM_FAULT_SIGBUS; 3324 runtime = substream->runtime; 3325 offset = vmf->pgoff << PAGE_SHIFT; 3326 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3327 if (offset > dma_bytes - PAGE_SIZE) 3328 return VM_FAULT_SIGBUS; 3329 if (substream->ops->page) 3330 page = substream->ops->page(substream, offset); 3331 else 3332 page = snd_pcm_default_page_ops(substream, offset); 3333 if (!page) 3334 return VM_FAULT_SIGBUS; 3335 get_page(page); 3336 vmf->page = page; 3337 return 0; 3338 } 3339 3340 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3341 .open = snd_pcm_mmap_data_open, 3342 .close = snd_pcm_mmap_data_close, 3343 }; 3344 3345 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3346 .open = snd_pcm_mmap_data_open, 3347 .close = snd_pcm_mmap_data_close, 3348 .fault = snd_pcm_mmap_data_fault, 3349 }; 3350 3351 /* 3352 * mmap the DMA buffer on RAM 3353 */ 3354 3355 /** 3356 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3357 * @substream: PCM substream 3358 * @area: VMA 3359 * 3360 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3361 * this function is invoked implicitly. 3362 */ 3363 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3364 struct vm_area_struct *area) 3365 { 3366 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3367 #ifdef CONFIG_GENERIC_ALLOCATOR 3368 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3369 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3370 return remap_pfn_range(area, area->vm_start, 3371 substream->dma_buffer.addr >> PAGE_SHIFT, 3372 area->vm_end - area->vm_start, area->vm_page_prot); 3373 } 3374 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3375 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3376 if (!substream->ops->page && 3377 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3378 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3379 area, 3380 substream->runtime->dma_area, 3381 substream->runtime->dma_addr, 3382 area->vm_end - area->vm_start); 3383 #endif /* CONFIG_X86 */ 3384 /* mmap with fault handler */ 3385 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3386 return 0; 3387 } 3388 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3389 3390 /* 3391 * mmap the DMA buffer on I/O memory area 3392 */ 3393 #if SNDRV_PCM_INFO_MMAP_IOMEM 3394 /** 3395 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3396 * @substream: PCM substream 3397 * @area: VMA 3398 * 3399 * When your hardware uses the iomapped pages as the hardware buffer and 3400 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3401 * is supposed to work only on limited architectures. 3402 */ 3403 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3404 struct vm_area_struct *area) 3405 { 3406 struct snd_pcm_runtime *runtime = substream->runtime;; 3407 3408 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3409 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3410 } 3411 3412 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3413 #endif /* SNDRV_PCM_INFO_MMAP */ 3414 3415 /* 3416 * mmap DMA buffer 3417 */ 3418 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3419 struct vm_area_struct *area) 3420 { 3421 struct snd_pcm_runtime *runtime; 3422 long size; 3423 unsigned long offset; 3424 size_t dma_bytes; 3425 int err; 3426 3427 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3428 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3429 return -EINVAL; 3430 } else { 3431 if (!(area->vm_flags & VM_READ)) 3432 return -EINVAL; 3433 } 3434 runtime = substream->runtime; 3435 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3436 return -EBADFD; 3437 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3438 return -ENXIO; 3439 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3440 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3441 return -EINVAL; 3442 size = area->vm_end - area->vm_start; 3443 offset = area->vm_pgoff << PAGE_SHIFT; 3444 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3445 if ((size_t)size > dma_bytes) 3446 return -EINVAL; 3447 if (offset > dma_bytes - size) 3448 return -EINVAL; 3449 3450 area->vm_ops = &snd_pcm_vm_ops_data; 3451 area->vm_private_data = substream; 3452 if (substream->ops->mmap) 3453 err = substream->ops->mmap(substream, area); 3454 else 3455 err = snd_pcm_lib_default_mmap(substream, area); 3456 if (!err) 3457 atomic_inc(&substream->mmap_count); 3458 return err; 3459 } 3460 3461 EXPORT_SYMBOL(snd_pcm_mmap_data); 3462 3463 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3464 { 3465 struct snd_pcm_file * pcm_file; 3466 struct snd_pcm_substream *substream; 3467 unsigned long offset; 3468 3469 pcm_file = file->private_data; 3470 substream = pcm_file->substream; 3471 if (PCM_RUNTIME_CHECK(substream)) 3472 return -ENXIO; 3473 3474 offset = area->vm_pgoff << PAGE_SHIFT; 3475 switch (offset) { 3476 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3477 if (pcm_file->no_compat_mmap) 3478 return -ENXIO; 3479 return snd_pcm_mmap_status(substream, file, area); 3480 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3481 if (pcm_file->no_compat_mmap) 3482 return -ENXIO; 3483 return snd_pcm_mmap_control(substream, file, area); 3484 default: 3485 return snd_pcm_mmap_data(substream, file, area); 3486 } 3487 return 0; 3488 } 3489 3490 static int snd_pcm_fasync(int fd, struct file * file, int on) 3491 { 3492 struct snd_pcm_file * pcm_file; 3493 struct snd_pcm_substream *substream; 3494 struct snd_pcm_runtime *runtime; 3495 3496 pcm_file = file->private_data; 3497 substream = pcm_file->substream; 3498 if (PCM_RUNTIME_CHECK(substream)) 3499 return -ENXIO; 3500 runtime = substream->runtime; 3501 return fasync_helper(fd, file, on, &runtime->fasync); 3502 } 3503 3504 /* 3505 * ioctl32 compat 3506 */ 3507 #ifdef CONFIG_COMPAT 3508 #include "pcm_compat.c" 3509 #else 3510 #define snd_pcm_ioctl_compat NULL 3511 #endif 3512 3513 /* 3514 * To be removed helpers to keep binary compatibility 3515 */ 3516 3517 #ifdef CONFIG_SND_SUPPORT_OLD_API 3518 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3519 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3520 3521 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3522 struct snd_pcm_hw_params_old *oparams) 3523 { 3524 unsigned int i; 3525 3526 memset(params, 0, sizeof(*params)); 3527 params->flags = oparams->flags; 3528 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3529 params->masks[i].bits[0] = oparams->masks[i]; 3530 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3531 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3532 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3533 params->info = oparams->info; 3534 params->msbits = oparams->msbits; 3535 params->rate_num = oparams->rate_num; 3536 params->rate_den = oparams->rate_den; 3537 params->fifo_size = oparams->fifo_size; 3538 } 3539 3540 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3541 struct snd_pcm_hw_params *params) 3542 { 3543 unsigned int i; 3544 3545 memset(oparams, 0, sizeof(*oparams)); 3546 oparams->flags = params->flags; 3547 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3548 oparams->masks[i] = params->masks[i].bits[0]; 3549 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3550 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3551 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3552 oparams->info = params->info; 3553 oparams->msbits = params->msbits; 3554 oparams->rate_num = params->rate_num; 3555 oparams->rate_den = params->rate_den; 3556 oparams->fifo_size = params->fifo_size; 3557 } 3558 3559 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3560 struct snd_pcm_hw_params_old __user * _oparams) 3561 { 3562 struct snd_pcm_hw_params *params; 3563 struct snd_pcm_hw_params_old *oparams = NULL; 3564 int err; 3565 3566 params = kmalloc(sizeof(*params), GFP_KERNEL); 3567 if (!params) 3568 return -ENOMEM; 3569 3570 oparams = memdup_user(_oparams, sizeof(*oparams)); 3571 if (IS_ERR(oparams)) { 3572 err = PTR_ERR(oparams); 3573 goto out; 3574 } 3575 snd_pcm_hw_convert_from_old_params(params, oparams); 3576 err = snd_pcm_hw_refine(substream, params); 3577 snd_pcm_hw_convert_to_old_params(oparams, params); 3578 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3579 if (!err) 3580 err = -EFAULT; 3581 } 3582 3583 kfree(oparams); 3584 out: 3585 kfree(params); 3586 return err; 3587 } 3588 3589 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3590 struct snd_pcm_hw_params_old __user * _oparams) 3591 { 3592 struct snd_pcm_hw_params *params; 3593 struct snd_pcm_hw_params_old *oparams = NULL; 3594 int err; 3595 3596 params = kmalloc(sizeof(*params), GFP_KERNEL); 3597 if (!params) 3598 return -ENOMEM; 3599 3600 oparams = memdup_user(_oparams, sizeof(*oparams)); 3601 if (IS_ERR(oparams)) { 3602 err = PTR_ERR(oparams); 3603 goto out; 3604 } 3605 snd_pcm_hw_convert_from_old_params(params, oparams); 3606 err = snd_pcm_hw_params(substream, params); 3607 snd_pcm_hw_convert_to_old_params(oparams, params); 3608 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3609 if (!err) 3610 err = -EFAULT; 3611 } 3612 3613 kfree(oparams); 3614 out: 3615 kfree(params); 3616 return err; 3617 } 3618 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3619 3620 #ifndef CONFIG_MMU 3621 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3622 unsigned long addr, 3623 unsigned long len, 3624 unsigned long pgoff, 3625 unsigned long flags) 3626 { 3627 struct snd_pcm_file *pcm_file = file->private_data; 3628 struct snd_pcm_substream *substream = pcm_file->substream; 3629 struct snd_pcm_runtime *runtime = substream->runtime; 3630 unsigned long offset = pgoff << PAGE_SHIFT; 3631 3632 switch (offset) { 3633 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3634 return (unsigned long)runtime->status; 3635 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3636 return (unsigned long)runtime->control; 3637 default: 3638 return (unsigned long)runtime->dma_area + offset; 3639 } 3640 } 3641 #else 3642 # define snd_pcm_get_unmapped_area NULL 3643 #endif 3644 3645 /* 3646 * Register section 3647 */ 3648 3649 const struct file_operations snd_pcm_f_ops[2] = { 3650 { 3651 .owner = THIS_MODULE, 3652 .write = snd_pcm_write, 3653 .write_iter = snd_pcm_writev, 3654 .open = snd_pcm_playback_open, 3655 .release = snd_pcm_release, 3656 .llseek = no_llseek, 3657 .poll = snd_pcm_playback_poll, 3658 .unlocked_ioctl = snd_pcm_playback_ioctl, 3659 .compat_ioctl = snd_pcm_ioctl_compat, 3660 .mmap = snd_pcm_mmap, 3661 .fasync = snd_pcm_fasync, 3662 .get_unmapped_area = snd_pcm_get_unmapped_area, 3663 }, 3664 { 3665 .owner = THIS_MODULE, 3666 .read = snd_pcm_read, 3667 .read_iter = snd_pcm_readv, 3668 .open = snd_pcm_capture_open, 3669 .release = snd_pcm_release, 3670 .llseek = no_llseek, 3671 .poll = snd_pcm_capture_poll, 3672 .unlocked_ioctl = snd_pcm_capture_ioctl, 3673 .compat_ioctl = snd_pcm_ioctl_compat, 3674 .mmap = snd_pcm_mmap, 3675 .fasync = snd_pcm_fasync, 3676 .get_unmapped_area = snd_pcm_get_unmapped_area, 3677 } 3678 }; 3679