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 /* 43 * Compatibility 44 */ 45 46 struct snd_pcm_hw_params_old { 47 unsigned int flags; 48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 49 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 52 unsigned int rmask; 53 unsigned int cmask; 54 unsigned int info; 55 unsigned int msbits; 56 unsigned int rate_num; 57 unsigned int rate_den; 58 snd_pcm_uframes_t fifo_size; 59 unsigned char reserved[64]; 60 }; 61 62 #ifdef CONFIG_SND_SUPPORT_OLD_API 63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 65 66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 67 struct snd_pcm_hw_params_old __user * _oparams); 68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 69 struct snd_pcm_hw_params_old __user * _oparams); 70 #endif 71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 72 73 /* 74 * 75 */ 76 77 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 78 static DECLARE_RWSEM(snd_pcm_link_rwsem); 79 80 /* Writer in rwsem may block readers even during its waiting in queue, 81 * and this may lead to a deadlock when the code path takes read sem 82 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 83 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 84 * spin until it gets the lock. 85 */ 86 static inline void down_write_nonblock(struct rw_semaphore *lock) 87 { 88 while (!down_write_trylock(lock)) 89 cond_resched(); 90 } 91 92 /** 93 * snd_pcm_stream_lock - Lock the PCM stream 94 * @substream: PCM substream 95 * 96 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 97 * flag of the given substream. This also takes the global link rw lock 98 * (or rw sem), too, for avoiding the race with linked streams. 99 */ 100 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 101 { 102 if (substream->pcm->nonatomic) { 103 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 104 mutex_lock(&substream->self_group.mutex); 105 } else { 106 read_lock(&snd_pcm_link_rwlock); 107 spin_lock(&substream->self_group.lock); 108 } 109 } 110 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 111 112 /** 113 * snd_pcm_stream_lock - Unlock the PCM stream 114 * @substream: PCM substream 115 * 116 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 117 */ 118 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 119 { 120 if (substream->pcm->nonatomic) { 121 mutex_unlock(&substream->self_group.mutex); 122 up_read(&snd_pcm_link_rwsem); 123 } else { 124 spin_unlock(&substream->self_group.lock); 125 read_unlock(&snd_pcm_link_rwlock); 126 } 127 } 128 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 129 130 /** 131 * snd_pcm_stream_lock_irq - Lock the PCM stream 132 * @substream: PCM substream 133 * 134 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 135 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 136 * as snd_pcm_stream_lock(). 137 */ 138 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 139 { 140 if (!substream->pcm->nonatomic) 141 local_irq_disable(); 142 snd_pcm_stream_lock(substream); 143 } 144 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 145 146 /** 147 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 148 * @substream: PCM substream 149 * 150 * This is a counter-part of snd_pcm_stream_lock_irq(). 151 */ 152 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 153 { 154 snd_pcm_stream_unlock(substream); 155 if (!substream->pcm->nonatomic) 156 local_irq_enable(); 157 } 158 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 159 160 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 161 { 162 unsigned long flags = 0; 163 if (!substream->pcm->nonatomic) 164 local_irq_save(flags); 165 snd_pcm_stream_lock(substream); 166 return flags; 167 } 168 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 169 170 /** 171 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 172 * @substream: PCM substream 173 * @flags: irq flags 174 * 175 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 176 */ 177 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 178 unsigned long flags) 179 { 180 snd_pcm_stream_unlock(substream); 181 if (!substream->pcm->nonatomic) 182 local_irq_restore(flags); 183 } 184 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 185 186 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 187 { 188 struct snd_pcm_runtime *runtime; 189 struct snd_pcm *pcm = substream->pcm; 190 struct snd_pcm_str *pstr = substream->pstr; 191 192 memset(info, 0, sizeof(*info)); 193 info->card = pcm->card->number; 194 info->device = pcm->device; 195 info->stream = substream->stream; 196 info->subdevice = substream->number; 197 strlcpy(info->id, pcm->id, sizeof(info->id)); 198 strlcpy(info->name, pcm->name, sizeof(info->name)); 199 info->dev_class = pcm->dev_class; 200 info->dev_subclass = pcm->dev_subclass; 201 info->subdevices_count = pstr->substream_count; 202 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 203 strlcpy(info->subname, substream->name, sizeof(info->subname)); 204 runtime = substream->runtime; 205 /* AB: FIXME!!! This is definitely nonsense */ 206 if (runtime) { 207 info->sync = runtime->sync; 208 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 209 } 210 return 0; 211 } 212 213 int snd_pcm_info_user(struct snd_pcm_substream *substream, 214 struct snd_pcm_info __user * _info) 215 { 216 struct snd_pcm_info *info; 217 int err; 218 219 info = kmalloc(sizeof(*info), GFP_KERNEL); 220 if (! info) 221 return -ENOMEM; 222 err = snd_pcm_info(substream, info); 223 if (err >= 0) { 224 if (copy_to_user(_info, info, sizeof(*info))) 225 err = -EFAULT; 226 } 227 kfree(info); 228 return err; 229 } 230 231 static bool hw_support_mmap(struct snd_pcm_substream *substream) 232 { 233 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 234 return false; 235 /* check architectures that return -EINVAL from dma_mmap_coherent() */ 236 /* FIXME: this should be some global flag */ 237 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\ 238 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA) 239 if (!substream->ops->mmap && 240 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 241 return false; 242 #endif 243 return true; 244 } 245 246 #undef RULES_DEBUG 247 248 #ifdef RULES_DEBUG 249 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v 250 static const char * const snd_pcm_hw_param_names[] = { 251 HW_PARAM(ACCESS), 252 HW_PARAM(FORMAT), 253 HW_PARAM(SUBFORMAT), 254 HW_PARAM(SAMPLE_BITS), 255 HW_PARAM(FRAME_BITS), 256 HW_PARAM(CHANNELS), 257 HW_PARAM(RATE), 258 HW_PARAM(PERIOD_TIME), 259 HW_PARAM(PERIOD_SIZE), 260 HW_PARAM(PERIOD_BYTES), 261 HW_PARAM(PERIODS), 262 HW_PARAM(BUFFER_TIME), 263 HW_PARAM(BUFFER_SIZE), 264 HW_PARAM(BUFFER_BYTES), 265 HW_PARAM(TICK_TIME), 266 }; 267 #endif 268 269 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 270 struct snd_pcm_hw_params *params) 271 { 272 unsigned int k; 273 struct snd_pcm_hardware *hw; 274 struct snd_interval *i = NULL; 275 struct snd_mask *m = NULL; 276 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; 277 unsigned int rstamps[constrs->rules_num]; 278 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 279 unsigned int stamp = 2; 280 int changed, again; 281 282 params->info = 0; 283 params->fifo_size = 0; 284 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 285 params->msbits = 0; 286 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 287 params->rate_num = 0; 288 params->rate_den = 0; 289 } 290 291 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 292 m = hw_param_mask(params, k); 293 if (snd_mask_empty(m)) 294 return -EINVAL; 295 if (!(params->rmask & (1 << k))) 296 continue; 297 #ifdef RULES_DEBUG 298 pr_debug("%s = ", snd_pcm_hw_param_names[k]); 299 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 300 #endif 301 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 302 #ifdef RULES_DEBUG 303 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 304 #endif 305 if (changed) 306 params->cmask |= 1 << k; 307 if (changed < 0) 308 return changed; 309 } 310 311 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 312 i = hw_param_interval(params, k); 313 if (snd_interval_empty(i)) 314 return -EINVAL; 315 if (!(params->rmask & (1 << k))) 316 continue; 317 #ifdef RULES_DEBUG 318 pr_debug("%s = ", snd_pcm_hw_param_names[k]); 319 if (i->empty) 320 pr_cont("empty"); 321 else 322 pr_cont("%c%u %u%c", 323 i->openmin ? '(' : '[', i->min, 324 i->max, i->openmax ? ')' : ']'); 325 pr_cont(" -> "); 326 #endif 327 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 328 #ifdef RULES_DEBUG 329 if (i->empty) 330 pr_cont("empty\n"); 331 else 332 pr_cont("%c%u %u%c\n", 333 i->openmin ? '(' : '[', i->min, 334 i->max, i->openmax ? ')' : ']'); 335 #endif 336 if (changed) 337 params->cmask |= 1 << k; 338 if (changed < 0) 339 return changed; 340 } 341 342 for (k = 0; k < constrs->rules_num; k++) 343 rstamps[k] = 0; 344 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 345 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 346 do { 347 again = 0; 348 for (k = 0; k < constrs->rules_num; k++) { 349 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 350 unsigned int d; 351 int doit = 0; 352 if (r->cond && !(r->cond & params->flags)) 353 continue; 354 for (d = 0; r->deps[d] >= 0; d++) { 355 if (vstamps[r->deps[d]] > rstamps[k]) { 356 doit = 1; 357 break; 358 } 359 } 360 if (!doit) 361 continue; 362 #ifdef RULES_DEBUG 363 pr_debug("Rule %d [%p]: ", k, r->func); 364 if (r->var >= 0) { 365 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]); 366 if (hw_is_mask(r->var)) { 367 m = hw_param_mask(params, r->var); 368 pr_cont("%x", *m->bits); 369 } else { 370 i = hw_param_interval(params, r->var); 371 if (i->empty) 372 pr_cont("empty"); 373 else 374 pr_cont("%c%u %u%c", 375 i->openmin ? '(' : '[', i->min, 376 i->max, i->openmax ? ')' : ']'); 377 } 378 } 379 #endif 380 changed = r->func(params, r); 381 #ifdef RULES_DEBUG 382 if (r->var >= 0) { 383 pr_cont(" -> "); 384 if (hw_is_mask(r->var)) 385 pr_cont("%x", *m->bits); 386 else { 387 if (i->empty) 388 pr_cont("empty"); 389 else 390 pr_cont("%c%u %u%c", 391 i->openmin ? '(' : '[', i->min, 392 i->max, i->openmax ? ')' : ']'); 393 } 394 } 395 pr_cont("\n"); 396 #endif 397 rstamps[k] = stamp; 398 if (changed && r->var >= 0) { 399 params->cmask |= (1 << r->var); 400 vstamps[r->var] = stamp; 401 again = 1; 402 } 403 if (changed < 0) 404 return changed; 405 stamp++; 406 } 407 } while (again); 408 if (!params->msbits) { 409 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 410 if (snd_interval_single(i)) 411 params->msbits = snd_interval_value(i); 412 } 413 414 if (!params->rate_den) { 415 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 416 if (snd_interval_single(i)) { 417 params->rate_num = snd_interval_value(i); 418 params->rate_den = 1; 419 } 420 } 421 422 hw = &substream->runtime->hw; 423 if (!params->info) { 424 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 425 SNDRV_PCM_INFO_DRAIN_TRIGGER); 426 if (!hw_support_mmap(substream)) 427 params->info &= ~(SNDRV_PCM_INFO_MMAP | 428 SNDRV_PCM_INFO_MMAP_VALID); 429 } 430 if (!params->fifo_size) { 431 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 432 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 433 if (snd_mask_min(m) == snd_mask_max(m) && 434 snd_interval_min(i) == snd_interval_max(i)) { 435 changed = substream->ops->ioctl(substream, 436 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 437 if (changed < 0) 438 return changed; 439 } 440 } 441 params->rmask = 0; 442 return 0; 443 } 444 445 EXPORT_SYMBOL(snd_pcm_hw_refine); 446 447 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 448 struct snd_pcm_hw_params __user * _params) 449 { 450 struct snd_pcm_hw_params *params; 451 int err; 452 453 params = memdup_user(_params, sizeof(*params)); 454 if (IS_ERR(params)) 455 return PTR_ERR(params); 456 457 err = snd_pcm_hw_refine(substream, params); 458 if (copy_to_user(_params, params, sizeof(*params))) { 459 if (!err) 460 err = -EFAULT; 461 } 462 463 kfree(params); 464 return err; 465 } 466 467 static int period_to_usecs(struct snd_pcm_runtime *runtime) 468 { 469 int usecs; 470 471 if (! runtime->rate) 472 return -1; /* invalid */ 473 474 /* take 75% of period time as the deadline */ 475 usecs = (750000 / runtime->rate) * runtime->period_size; 476 usecs += ((750000 % runtime->rate) * runtime->period_size) / 477 runtime->rate; 478 479 return usecs; 480 } 481 482 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 483 { 484 snd_pcm_stream_lock_irq(substream); 485 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 486 substream->runtime->status->state = state; 487 snd_pcm_stream_unlock_irq(substream); 488 } 489 490 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 491 int event) 492 { 493 #ifdef CONFIG_SND_PCM_TIMER 494 if (substream->timer) 495 snd_timer_notify(substream->timer, event, 496 &substream->runtime->trigger_tstamp); 497 #endif 498 } 499 500 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 501 struct snd_pcm_hw_params *params) 502 { 503 struct snd_pcm_runtime *runtime; 504 int err, usecs; 505 unsigned int bits; 506 snd_pcm_uframes_t frames; 507 508 if (PCM_RUNTIME_CHECK(substream)) 509 return -ENXIO; 510 runtime = substream->runtime; 511 snd_pcm_stream_lock_irq(substream); 512 switch (runtime->status->state) { 513 case SNDRV_PCM_STATE_OPEN: 514 case SNDRV_PCM_STATE_SETUP: 515 case SNDRV_PCM_STATE_PREPARED: 516 break; 517 default: 518 snd_pcm_stream_unlock_irq(substream); 519 return -EBADFD; 520 } 521 snd_pcm_stream_unlock_irq(substream); 522 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 523 if (!substream->oss.oss) 524 #endif 525 if (atomic_read(&substream->mmap_count)) 526 return -EBADFD; 527 528 params->rmask = ~0U; 529 err = snd_pcm_hw_refine(substream, params); 530 if (err < 0) 531 goto _error; 532 533 err = snd_pcm_hw_params_choose(substream, params); 534 if (err < 0) 535 goto _error; 536 537 if (substream->ops->hw_params != NULL) { 538 err = substream->ops->hw_params(substream, params); 539 if (err < 0) 540 goto _error; 541 } 542 543 runtime->access = params_access(params); 544 runtime->format = params_format(params); 545 runtime->subformat = params_subformat(params); 546 runtime->channels = params_channels(params); 547 runtime->rate = params_rate(params); 548 runtime->period_size = params_period_size(params); 549 runtime->periods = params_periods(params); 550 runtime->buffer_size = params_buffer_size(params); 551 runtime->info = params->info; 552 runtime->rate_num = params->rate_num; 553 runtime->rate_den = params->rate_den; 554 runtime->no_period_wakeup = 555 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 556 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 557 558 bits = snd_pcm_format_physical_width(runtime->format); 559 runtime->sample_bits = bits; 560 bits *= runtime->channels; 561 runtime->frame_bits = bits; 562 frames = 1; 563 while (bits % 8 != 0) { 564 bits *= 2; 565 frames *= 2; 566 } 567 runtime->byte_align = bits / 8; 568 runtime->min_align = frames; 569 570 /* Default sw params */ 571 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 572 runtime->period_step = 1; 573 runtime->control->avail_min = runtime->period_size; 574 runtime->start_threshold = 1; 575 runtime->stop_threshold = runtime->buffer_size; 576 runtime->silence_threshold = 0; 577 runtime->silence_size = 0; 578 runtime->boundary = runtime->buffer_size; 579 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 580 runtime->boundary *= 2; 581 582 snd_pcm_timer_resolution_change(substream); 583 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 584 585 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 586 pm_qos_remove_request(&substream->latency_pm_qos_req); 587 if ((usecs = period_to_usecs(runtime)) >= 0) 588 pm_qos_add_request(&substream->latency_pm_qos_req, 589 PM_QOS_CPU_DMA_LATENCY, usecs); 590 return 0; 591 _error: 592 /* hardware might be unusable from this time, 593 so we force application to retry to set 594 the correct hardware parameter settings */ 595 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 596 if (substream->ops->hw_free != NULL) 597 substream->ops->hw_free(substream); 598 return err; 599 } 600 601 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 602 struct snd_pcm_hw_params __user * _params) 603 { 604 struct snd_pcm_hw_params *params; 605 int err; 606 607 params = memdup_user(_params, sizeof(*params)); 608 if (IS_ERR(params)) 609 return PTR_ERR(params); 610 611 err = snd_pcm_hw_params(substream, params); 612 if (copy_to_user(_params, params, sizeof(*params))) { 613 if (!err) 614 err = -EFAULT; 615 } 616 617 kfree(params); 618 return err; 619 } 620 621 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 622 { 623 struct snd_pcm_runtime *runtime; 624 int result = 0; 625 626 if (PCM_RUNTIME_CHECK(substream)) 627 return -ENXIO; 628 runtime = substream->runtime; 629 snd_pcm_stream_lock_irq(substream); 630 switch (runtime->status->state) { 631 case SNDRV_PCM_STATE_SETUP: 632 case SNDRV_PCM_STATE_PREPARED: 633 break; 634 default: 635 snd_pcm_stream_unlock_irq(substream); 636 return -EBADFD; 637 } 638 snd_pcm_stream_unlock_irq(substream); 639 if (atomic_read(&substream->mmap_count)) 640 return -EBADFD; 641 if (substream->ops->hw_free) 642 result = substream->ops->hw_free(substream); 643 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 644 pm_qos_remove_request(&substream->latency_pm_qos_req); 645 return result; 646 } 647 648 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 649 struct snd_pcm_sw_params *params) 650 { 651 struct snd_pcm_runtime *runtime; 652 int err; 653 654 if (PCM_RUNTIME_CHECK(substream)) 655 return -ENXIO; 656 runtime = substream->runtime; 657 snd_pcm_stream_lock_irq(substream); 658 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 659 snd_pcm_stream_unlock_irq(substream); 660 return -EBADFD; 661 } 662 snd_pcm_stream_unlock_irq(substream); 663 664 if (params->tstamp_mode < 0 || 665 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 666 return -EINVAL; 667 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 668 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 669 return -EINVAL; 670 if (params->avail_min == 0) 671 return -EINVAL; 672 if (params->silence_size >= runtime->boundary) { 673 if (params->silence_threshold != 0) 674 return -EINVAL; 675 } else { 676 if (params->silence_size > params->silence_threshold) 677 return -EINVAL; 678 if (params->silence_threshold > runtime->buffer_size) 679 return -EINVAL; 680 } 681 err = 0; 682 snd_pcm_stream_lock_irq(substream); 683 runtime->tstamp_mode = params->tstamp_mode; 684 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 685 runtime->tstamp_type = params->tstamp_type; 686 runtime->period_step = params->period_step; 687 runtime->control->avail_min = params->avail_min; 688 runtime->start_threshold = params->start_threshold; 689 runtime->stop_threshold = params->stop_threshold; 690 runtime->silence_threshold = params->silence_threshold; 691 runtime->silence_size = params->silence_size; 692 params->boundary = runtime->boundary; 693 if (snd_pcm_running(substream)) { 694 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 695 runtime->silence_size > 0) 696 snd_pcm_playback_silence(substream, ULONG_MAX); 697 err = snd_pcm_update_state(substream, runtime); 698 } 699 snd_pcm_stream_unlock_irq(substream); 700 return err; 701 } 702 703 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 704 struct snd_pcm_sw_params __user * _params) 705 { 706 struct snd_pcm_sw_params params; 707 int err; 708 if (copy_from_user(¶ms, _params, sizeof(params))) 709 return -EFAULT; 710 err = snd_pcm_sw_params(substream, ¶ms); 711 if (copy_to_user(_params, ¶ms, sizeof(params))) 712 return -EFAULT; 713 return err; 714 } 715 716 int snd_pcm_status(struct snd_pcm_substream *substream, 717 struct snd_pcm_status *status) 718 { 719 struct snd_pcm_runtime *runtime = substream->runtime; 720 721 snd_pcm_stream_lock_irq(substream); 722 723 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 724 &runtime->audio_tstamp_config); 725 726 /* backwards compatible behavior */ 727 if (runtime->audio_tstamp_config.type_requested == 728 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 729 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 730 runtime->audio_tstamp_config.type_requested = 731 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 732 else 733 runtime->audio_tstamp_config.type_requested = 734 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 735 runtime->audio_tstamp_report.valid = 0; 736 } else 737 runtime->audio_tstamp_report.valid = 1; 738 739 status->state = runtime->status->state; 740 status->suspended_state = runtime->status->suspended_state; 741 if (status->state == SNDRV_PCM_STATE_OPEN) 742 goto _end; 743 status->trigger_tstamp = runtime->trigger_tstamp; 744 if (snd_pcm_running(substream)) { 745 snd_pcm_update_hw_ptr(substream); 746 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 747 status->tstamp = runtime->status->tstamp; 748 status->driver_tstamp = runtime->driver_tstamp; 749 status->audio_tstamp = 750 runtime->status->audio_tstamp; 751 if (runtime->audio_tstamp_report.valid == 1) 752 /* backwards compatibility, no report provided in COMPAT mode */ 753 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 754 &status->audio_tstamp_accuracy, 755 &runtime->audio_tstamp_report); 756 757 goto _tstamp_end; 758 } 759 } else { 760 /* get tstamp only in fallback mode and only if enabled */ 761 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 762 snd_pcm_gettime(runtime, &status->tstamp); 763 } 764 _tstamp_end: 765 status->appl_ptr = runtime->control->appl_ptr; 766 status->hw_ptr = runtime->status->hw_ptr; 767 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 768 status->avail = snd_pcm_playback_avail(runtime); 769 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 770 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 771 status->delay = runtime->buffer_size - status->avail; 772 status->delay += runtime->delay; 773 } else 774 status->delay = 0; 775 } else { 776 status->avail = snd_pcm_capture_avail(runtime); 777 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 778 status->delay = status->avail + runtime->delay; 779 else 780 status->delay = 0; 781 } 782 status->avail_max = runtime->avail_max; 783 status->overrange = runtime->overrange; 784 runtime->avail_max = 0; 785 runtime->overrange = 0; 786 _end: 787 snd_pcm_stream_unlock_irq(substream); 788 return 0; 789 } 790 791 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 792 struct snd_pcm_status __user * _status, 793 bool ext) 794 { 795 struct snd_pcm_status status; 796 int res; 797 798 memset(&status, 0, sizeof(status)); 799 /* 800 * with extension, parameters are read/write, 801 * get audio_tstamp_data from user, 802 * ignore rest of status structure 803 */ 804 if (ext && get_user(status.audio_tstamp_data, 805 (u32 __user *)(&_status->audio_tstamp_data))) 806 return -EFAULT; 807 res = snd_pcm_status(substream, &status); 808 if (res < 0) 809 return res; 810 if (copy_to_user(_status, &status, sizeof(status))) 811 return -EFAULT; 812 return 0; 813 } 814 815 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 816 struct snd_pcm_channel_info * info) 817 { 818 struct snd_pcm_runtime *runtime; 819 unsigned int channel; 820 821 channel = info->channel; 822 runtime = substream->runtime; 823 snd_pcm_stream_lock_irq(substream); 824 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 825 snd_pcm_stream_unlock_irq(substream); 826 return -EBADFD; 827 } 828 snd_pcm_stream_unlock_irq(substream); 829 if (channel >= runtime->channels) 830 return -EINVAL; 831 memset(info, 0, sizeof(*info)); 832 info->channel = channel; 833 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 834 } 835 836 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 837 struct snd_pcm_channel_info __user * _info) 838 { 839 struct snd_pcm_channel_info info; 840 int res; 841 842 if (copy_from_user(&info, _info, sizeof(info))) 843 return -EFAULT; 844 res = snd_pcm_channel_info(substream, &info); 845 if (res < 0) 846 return res; 847 if (copy_to_user(_info, &info, sizeof(info))) 848 return -EFAULT; 849 return 0; 850 } 851 852 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 853 { 854 struct snd_pcm_runtime *runtime = substream->runtime; 855 if (runtime->trigger_master == NULL) 856 return; 857 if (runtime->trigger_master == substream) { 858 if (!runtime->trigger_tstamp_latched) 859 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 860 } else { 861 snd_pcm_trigger_tstamp(runtime->trigger_master); 862 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 863 } 864 runtime->trigger_master = NULL; 865 } 866 867 struct action_ops { 868 int (*pre_action)(struct snd_pcm_substream *substream, int state); 869 int (*do_action)(struct snd_pcm_substream *substream, int state); 870 void (*undo_action)(struct snd_pcm_substream *substream, int state); 871 void (*post_action)(struct snd_pcm_substream *substream, int state); 872 }; 873 874 /* 875 * this functions is core for handling of linked stream 876 * Note: the stream state might be changed also on failure 877 * Note2: call with calling stream lock + link lock 878 */ 879 static int snd_pcm_action_group(const struct action_ops *ops, 880 struct snd_pcm_substream *substream, 881 int state, int do_lock) 882 { 883 struct snd_pcm_substream *s = NULL; 884 struct snd_pcm_substream *s1; 885 int res = 0, depth = 1; 886 887 snd_pcm_group_for_each_entry(s, substream) { 888 if (do_lock && s != substream) { 889 if (s->pcm->nonatomic) 890 mutex_lock_nested(&s->self_group.mutex, depth); 891 else 892 spin_lock_nested(&s->self_group.lock, depth); 893 depth++; 894 } 895 res = ops->pre_action(s, state); 896 if (res < 0) 897 goto _unlock; 898 } 899 snd_pcm_group_for_each_entry(s, substream) { 900 res = ops->do_action(s, state); 901 if (res < 0) { 902 if (ops->undo_action) { 903 snd_pcm_group_for_each_entry(s1, substream) { 904 if (s1 == s) /* failed stream */ 905 break; 906 ops->undo_action(s1, state); 907 } 908 } 909 s = NULL; /* unlock all */ 910 goto _unlock; 911 } 912 } 913 snd_pcm_group_for_each_entry(s, substream) { 914 ops->post_action(s, state); 915 } 916 _unlock: 917 if (do_lock) { 918 /* unlock streams */ 919 snd_pcm_group_for_each_entry(s1, substream) { 920 if (s1 != substream) { 921 if (s1->pcm->nonatomic) 922 mutex_unlock(&s1->self_group.mutex); 923 else 924 spin_unlock(&s1->self_group.lock); 925 } 926 if (s1 == s) /* end */ 927 break; 928 } 929 } 930 return res; 931 } 932 933 /* 934 * Note: call with stream lock 935 */ 936 static int snd_pcm_action_single(const struct action_ops *ops, 937 struct snd_pcm_substream *substream, 938 int state) 939 { 940 int res; 941 942 res = ops->pre_action(substream, state); 943 if (res < 0) 944 return res; 945 res = ops->do_action(substream, state); 946 if (res == 0) 947 ops->post_action(substream, state); 948 else if (ops->undo_action) 949 ops->undo_action(substream, state); 950 return res; 951 } 952 953 /* 954 * Note: call with stream lock 955 */ 956 static int snd_pcm_action(const struct action_ops *ops, 957 struct snd_pcm_substream *substream, 958 int state) 959 { 960 int res; 961 962 if (!snd_pcm_stream_linked(substream)) 963 return snd_pcm_action_single(ops, substream, state); 964 965 if (substream->pcm->nonatomic) { 966 if (!mutex_trylock(&substream->group->mutex)) { 967 mutex_unlock(&substream->self_group.mutex); 968 mutex_lock(&substream->group->mutex); 969 mutex_lock(&substream->self_group.mutex); 970 } 971 res = snd_pcm_action_group(ops, substream, state, 1); 972 mutex_unlock(&substream->group->mutex); 973 } else { 974 if (!spin_trylock(&substream->group->lock)) { 975 spin_unlock(&substream->self_group.lock); 976 spin_lock(&substream->group->lock); 977 spin_lock(&substream->self_group.lock); 978 } 979 res = snd_pcm_action_group(ops, substream, state, 1); 980 spin_unlock(&substream->group->lock); 981 } 982 return res; 983 } 984 985 /* 986 * Note: don't use any locks before 987 */ 988 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 989 struct snd_pcm_substream *substream, 990 int state) 991 { 992 int res; 993 994 snd_pcm_stream_lock_irq(substream); 995 res = snd_pcm_action(ops, substream, state); 996 snd_pcm_stream_unlock_irq(substream); 997 return res; 998 } 999 1000 /* 1001 */ 1002 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1003 struct snd_pcm_substream *substream, 1004 int state) 1005 { 1006 int res; 1007 1008 down_read(&snd_pcm_link_rwsem); 1009 if (snd_pcm_stream_linked(substream)) 1010 res = snd_pcm_action_group(ops, substream, state, 0); 1011 else 1012 res = snd_pcm_action_single(ops, substream, state); 1013 up_read(&snd_pcm_link_rwsem); 1014 return res; 1015 } 1016 1017 /* 1018 * start callbacks 1019 */ 1020 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1021 { 1022 struct snd_pcm_runtime *runtime = substream->runtime; 1023 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1024 return -EBADFD; 1025 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1026 !snd_pcm_playback_data(substream)) 1027 return -EPIPE; 1028 runtime->trigger_tstamp_latched = false; 1029 runtime->trigger_master = substream; 1030 return 0; 1031 } 1032 1033 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1034 { 1035 if (substream->runtime->trigger_master != substream) 1036 return 0; 1037 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1038 } 1039 1040 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1041 { 1042 if (substream->runtime->trigger_master == substream) 1043 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1044 } 1045 1046 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1047 { 1048 struct snd_pcm_runtime *runtime = substream->runtime; 1049 snd_pcm_trigger_tstamp(substream); 1050 runtime->hw_ptr_jiffies = jiffies; 1051 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1052 runtime->rate; 1053 runtime->status->state = state; 1054 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1055 runtime->silence_size > 0) 1056 snd_pcm_playback_silence(substream, ULONG_MAX); 1057 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1058 } 1059 1060 static const struct action_ops snd_pcm_action_start = { 1061 .pre_action = snd_pcm_pre_start, 1062 .do_action = snd_pcm_do_start, 1063 .undo_action = snd_pcm_undo_start, 1064 .post_action = snd_pcm_post_start 1065 }; 1066 1067 /** 1068 * snd_pcm_start - start all linked streams 1069 * @substream: the PCM substream instance 1070 * 1071 * Return: Zero if successful, or a negative error code. 1072 * The stream lock must be acquired before calling this function. 1073 */ 1074 int snd_pcm_start(struct snd_pcm_substream *substream) 1075 { 1076 return snd_pcm_action(&snd_pcm_action_start, substream, 1077 SNDRV_PCM_STATE_RUNNING); 1078 } 1079 1080 /* take the stream lock and start the streams */ 1081 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1082 { 1083 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1084 SNDRV_PCM_STATE_RUNNING); 1085 } 1086 1087 /* 1088 * stop callbacks 1089 */ 1090 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1091 { 1092 struct snd_pcm_runtime *runtime = substream->runtime; 1093 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1094 return -EBADFD; 1095 runtime->trigger_master = substream; 1096 return 0; 1097 } 1098 1099 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1100 { 1101 if (substream->runtime->trigger_master == substream && 1102 snd_pcm_running(substream)) 1103 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1104 return 0; /* unconditonally stop all substreams */ 1105 } 1106 1107 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1108 { 1109 struct snd_pcm_runtime *runtime = substream->runtime; 1110 if (runtime->status->state != state) { 1111 snd_pcm_trigger_tstamp(substream); 1112 runtime->status->state = state; 1113 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1114 } 1115 wake_up(&runtime->sleep); 1116 wake_up(&runtime->tsleep); 1117 } 1118 1119 static const struct action_ops snd_pcm_action_stop = { 1120 .pre_action = snd_pcm_pre_stop, 1121 .do_action = snd_pcm_do_stop, 1122 .post_action = snd_pcm_post_stop 1123 }; 1124 1125 /** 1126 * snd_pcm_stop - try to stop all running streams in the substream group 1127 * @substream: the PCM substream instance 1128 * @state: PCM state after stopping the stream 1129 * 1130 * The state of each stream is then changed to the given state unconditionally. 1131 * 1132 * Return: Zero if successful, or a negative error code. 1133 */ 1134 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1135 { 1136 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1137 } 1138 1139 EXPORT_SYMBOL(snd_pcm_stop); 1140 1141 /** 1142 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1143 * @substream: the PCM substream 1144 * 1145 * After stopping, the state is changed to SETUP. 1146 * Unlike snd_pcm_stop(), this affects only the given stream. 1147 * 1148 * Return: Zero if succesful, or a negative error code. 1149 */ 1150 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1151 { 1152 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1153 SNDRV_PCM_STATE_SETUP); 1154 } 1155 1156 /** 1157 * snd_pcm_stop_xrun - stop the running streams as XRUN 1158 * @substream: the PCM substream instance 1159 * 1160 * This stops the given running substream (and all linked substreams) as XRUN. 1161 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1162 * 1163 * Return: Zero if successful, or a negative error code. 1164 */ 1165 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1166 { 1167 unsigned long flags; 1168 int ret = 0; 1169 1170 snd_pcm_stream_lock_irqsave(substream, flags); 1171 if (snd_pcm_running(substream)) 1172 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1173 snd_pcm_stream_unlock_irqrestore(substream, flags); 1174 return ret; 1175 } 1176 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1177 1178 /* 1179 * pause callbacks 1180 */ 1181 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1182 { 1183 struct snd_pcm_runtime *runtime = substream->runtime; 1184 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1185 return -ENOSYS; 1186 if (push) { 1187 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1188 return -EBADFD; 1189 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1190 return -EBADFD; 1191 runtime->trigger_master = substream; 1192 return 0; 1193 } 1194 1195 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1196 { 1197 if (substream->runtime->trigger_master != substream) 1198 return 0; 1199 /* some drivers might use hw_ptr to recover from the pause - 1200 update the hw_ptr now */ 1201 if (push) 1202 snd_pcm_update_hw_ptr(substream); 1203 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1204 * a delta between the current jiffies, this gives a large enough 1205 * delta, effectively to skip the check once. 1206 */ 1207 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1208 return substream->ops->trigger(substream, 1209 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1210 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1211 } 1212 1213 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1214 { 1215 if (substream->runtime->trigger_master == substream) 1216 substream->ops->trigger(substream, 1217 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1218 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1219 } 1220 1221 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1222 { 1223 struct snd_pcm_runtime *runtime = substream->runtime; 1224 snd_pcm_trigger_tstamp(substream); 1225 if (push) { 1226 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1227 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1228 wake_up(&runtime->sleep); 1229 wake_up(&runtime->tsleep); 1230 } else { 1231 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1232 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1233 } 1234 } 1235 1236 static const struct action_ops snd_pcm_action_pause = { 1237 .pre_action = snd_pcm_pre_pause, 1238 .do_action = snd_pcm_do_pause, 1239 .undo_action = snd_pcm_undo_pause, 1240 .post_action = snd_pcm_post_pause 1241 }; 1242 1243 /* 1244 * Push/release the pause for all linked streams. 1245 */ 1246 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1247 { 1248 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1249 } 1250 1251 #ifdef CONFIG_PM 1252 /* suspend */ 1253 1254 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1255 { 1256 struct snd_pcm_runtime *runtime = substream->runtime; 1257 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1258 return -EBUSY; 1259 runtime->trigger_master = substream; 1260 return 0; 1261 } 1262 1263 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1264 { 1265 struct snd_pcm_runtime *runtime = substream->runtime; 1266 if (runtime->trigger_master != substream) 1267 return 0; 1268 if (! snd_pcm_running(substream)) 1269 return 0; 1270 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1271 return 0; /* suspend unconditionally */ 1272 } 1273 1274 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1275 { 1276 struct snd_pcm_runtime *runtime = substream->runtime; 1277 snd_pcm_trigger_tstamp(substream); 1278 runtime->status->suspended_state = runtime->status->state; 1279 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1280 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1281 wake_up(&runtime->sleep); 1282 wake_up(&runtime->tsleep); 1283 } 1284 1285 static const struct action_ops snd_pcm_action_suspend = { 1286 .pre_action = snd_pcm_pre_suspend, 1287 .do_action = snd_pcm_do_suspend, 1288 .post_action = snd_pcm_post_suspend 1289 }; 1290 1291 /** 1292 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1293 * @substream: the PCM substream 1294 * 1295 * After this call, all streams are changed to SUSPENDED state. 1296 * 1297 * Return: Zero if successful (or @substream is %NULL), or a negative error 1298 * code. 1299 */ 1300 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1301 { 1302 int err; 1303 unsigned long flags; 1304 1305 if (! substream) 1306 return 0; 1307 1308 snd_pcm_stream_lock_irqsave(substream, flags); 1309 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1310 snd_pcm_stream_unlock_irqrestore(substream, flags); 1311 return err; 1312 } 1313 1314 EXPORT_SYMBOL(snd_pcm_suspend); 1315 1316 /** 1317 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1318 * @pcm: the PCM instance 1319 * 1320 * After this call, all streams are changed to SUSPENDED state. 1321 * 1322 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1323 */ 1324 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1325 { 1326 struct snd_pcm_substream *substream; 1327 int stream, err = 0; 1328 1329 if (! pcm) 1330 return 0; 1331 1332 for (stream = 0; stream < 2; stream++) { 1333 for (substream = pcm->streams[stream].substream; 1334 substream; substream = substream->next) { 1335 /* FIXME: the open/close code should lock this as well */ 1336 if (substream->runtime == NULL) 1337 continue; 1338 err = snd_pcm_suspend(substream); 1339 if (err < 0 && err != -EBUSY) 1340 return err; 1341 } 1342 } 1343 return 0; 1344 } 1345 1346 EXPORT_SYMBOL(snd_pcm_suspend_all); 1347 1348 /* resume */ 1349 1350 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1351 { 1352 struct snd_pcm_runtime *runtime = substream->runtime; 1353 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1354 return -ENOSYS; 1355 runtime->trigger_master = substream; 1356 return 0; 1357 } 1358 1359 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1360 { 1361 struct snd_pcm_runtime *runtime = substream->runtime; 1362 if (runtime->trigger_master != substream) 1363 return 0; 1364 /* DMA not running previously? */ 1365 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1366 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1367 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1368 return 0; 1369 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1370 } 1371 1372 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1373 { 1374 if (substream->runtime->trigger_master == substream && 1375 snd_pcm_running(substream)) 1376 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1377 } 1378 1379 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1380 { 1381 struct snd_pcm_runtime *runtime = substream->runtime; 1382 snd_pcm_trigger_tstamp(substream); 1383 runtime->status->state = runtime->status->suspended_state; 1384 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1385 } 1386 1387 static const struct action_ops snd_pcm_action_resume = { 1388 .pre_action = snd_pcm_pre_resume, 1389 .do_action = snd_pcm_do_resume, 1390 .undo_action = snd_pcm_undo_resume, 1391 .post_action = snd_pcm_post_resume 1392 }; 1393 1394 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1395 { 1396 struct snd_card *card = substream->pcm->card; 1397 int res; 1398 1399 snd_power_lock(card); 1400 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1401 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1402 snd_power_unlock(card); 1403 return res; 1404 } 1405 1406 #else 1407 1408 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1409 { 1410 return -ENOSYS; 1411 } 1412 1413 #endif /* CONFIG_PM */ 1414 1415 /* 1416 * xrun ioctl 1417 * 1418 * Change the RUNNING stream(s) to XRUN state. 1419 */ 1420 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1421 { 1422 struct snd_card *card = substream->pcm->card; 1423 struct snd_pcm_runtime *runtime = substream->runtime; 1424 int result; 1425 1426 snd_power_lock(card); 1427 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1428 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1429 if (result < 0) 1430 goto _unlock; 1431 } 1432 1433 snd_pcm_stream_lock_irq(substream); 1434 switch (runtime->status->state) { 1435 case SNDRV_PCM_STATE_XRUN: 1436 result = 0; /* already there */ 1437 break; 1438 case SNDRV_PCM_STATE_RUNNING: 1439 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1440 break; 1441 default: 1442 result = -EBADFD; 1443 } 1444 snd_pcm_stream_unlock_irq(substream); 1445 _unlock: 1446 snd_power_unlock(card); 1447 return result; 1448 } 1449 1450 /* 1451 * reset ioctl 1452 */ 1453 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1454 { 1455 struct snd_pcm_runtime *runtime = substream->runtime; 1456 switch (runtime->status->state) { 1457 case SNDRV_PCM_STATE_RUNNING: 1458 case SNDRV_PCM_STATE_PREPARED: 1459 case SNDRV_PCM_STATE_PAUSED: 1460 case SNDRV_PCM_STATE_SUSPENDED: 1461 return 0; 1462 default: 1463 return -EBADFD; 1464 } 1465 } 1466 1467 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1468 { 1469 struct snd_pcm_runtime *runtime = substream->runtime; 1470 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1471 if (err < 0) 1472 return err; 1473 runtime->hw_ptr_base = 0; 1474 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1475 runtime->status->hw_ptr % runtime->period_size; 1476 runtime->silence_start = runtime->status->hw_ptr; 1477 runtime->silence_filled = 0; 1478 return 0; 1479 } 1480 1481 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1482 { 1483 struct snd_pcm_runtime *runtime = substream->runtime; 1484 runtime->control->appl_ptr = runtime->status->hw_ptr; 1485 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1486 runtime->silence_size > 0) 1487 snd_pcm_playback_silence(substream, ULONG_MAX); 1488 } 1489 1490 static const struct action_ops snd_pcm_action_reset = { 1491 .pre_action = snd_pcm_pre_reset, 1492 .do_action = snd_pcm_do_reset, 1493 .post_action = snd_pcm_post_reset 1494 }; 1495 1496 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1497 { 1498 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1499 } 1500 1501 /* 1502 * prepare ioctl 1503 */ 1504 /* we use the second argument for updating f_flags */ 1505 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1506 int f_flags) 1507 { 1508 struct snd_pcm_runtime *runtime = substream->runtime; 1509 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1510 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1511 return -EBADFD; 1512 if (snd_pcm_running(substream)) 1513 return -EBUSY; 1514 substream->f_flags = f_flags; 1515 return 0; 1516 } 1517 1518 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1519 { 1520 int err; 1521 err = substream->ops->prepare(substream); 1522 if (err < 0) 1523 return err; 1524 return snd_pcm_do_reset(substream, 0); 1525 } 1526 1527 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1528 { 1529 struct snd_pcm_runtime *runtime = substream->runtime; 1530 runtime->control->appl_ptr = runtime->status->hw_ptr; 1531 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1532 } 1533 1534 static const struct action_ops snd_pcm_action_prepare = { 1535 .pre_action = snd_pcm_pre_prepare, 1536 .do_action = snd_pcm_do_prepare, 1537 .post_action = snd_pcm_post_prepare 1538 }; 1539 1540 /** 1541 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1542 * @substream: the PCM substream instance 1543 * @file: file to refer f_flags 1544 * 1545 * Return: Zero if successful, or a negative error code. 1546 */ 1547 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1548 struct file *file) 1549 { 1550 int res; 1551 struct snd_card *card = substream->pcm->card; 1552 int f_flags; 1553 1554 if (file) 1555 f_flags = file->f_flags; 1556 else 1557 f_flags = substream->f_flags; 1558 1559 snd_power_lock(card); 1560 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1561 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1562 substream, f_flags); 1563 snd_power_unlock(card); 1564 return res; 1565 } 1566 1567 /* 1568 * drain ioctl 1569 */ 1570 1571 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1572 { 1573 struct snd_pcm_runtime *runtime = substream->runtime; 1574 switch (runtime->status->state) { 1575 case SNDRV_PCM_STATE_OPEN: 1576 case SNDRV_PCM_STATE_DISCONNECTED: 1577 case SNDRV_PCM_STATE_SUSPENDED: 1578 return -EBADFD; 1579 } 1580 runtime->trigger_master = substream; 1581 return 0; 1582 } 1583 1584 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1585 { 1586 struct snd_pcm_runtime *runtime = substream->runtime; 1587 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1588 switch (runtime->status->state) { 1589 case SNDRV_PCM_STATE_PREPARED: 1590 /* start playback stream if possible */ 1591 if (! snd_pcm_playback_empty(substream)) { 1592 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1593 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1594 } else { 1595 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1596 } 1597 break; 1598 case SNDRV_PCM_STATE_RUNNING: 1599 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1600 break; 1601 case SNDRV_PCM_STATE_XRUN: 1602 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1603 break; 1604 default: 1605 break; 1606 } 1607 } else { 1608 /* stop running stream */ 1609 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1610 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1611 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1612 snd_pcm_do_stop(substream, new_state); 1613 snd_pcm_post_stop(substream, new_state); 1614 } 1615 } 1616 1617 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1618 runtime->trigger_master == substream && 1619 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1620 return substream->ops->trigger(substream, 1621 SNDRV_PCM_TRIGGER_DRAIN); 1622 1623 return 0; 1624 } 1625 1626 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1627 { 1628 } 1629 1630 static const struct action_ops snd_pcm_action_drain_init = { 1631 .pre_action = snd_pcm_pre_drain_init, 1632 .do_action = snd_pcm_do_drain_init, 1633 .post_action = snd_pcm_post_drain_init 1634 }; 1635 1636 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1637 1638 /* 1639 * Drain the stream(s). 1640 * When the substream is linked, sync until the draining of all playback streams 1641 * is finished. 1642 * After this call, all streams are supposed to be either SETUP or DRAINING 1643 * (capture only) state. 1644 */ 1645 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1646 struct file *file) 1647 { 1648 struct snd_card *card; 1649 struct snd_pcm_runtime *runtime; 1650 struct snd_pcm_substream *s; 1651 wait_queue_t wait; 1652 int result = 0; 1653 int nonblock = 0; 1654 1655 card = substream->pcm->card; 1656 runtime = substream->runtime; 1657 1658 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1659 return -EBADFD; 1660 1661 snd_power_lock(card); 1662 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1663 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1664 if (result < 0) { 1665 snd_power_unlock(card); 1666 return result; 1667 } 1668 } 1669 1670 if (file) { 1671 if (file->f_flags & O_NONBLOCK) 1672 nonblock = 1; 1673 } else if (substream->f_flags & O_NONBLOCK) 1674 nonblock = 1; 1675 1676 down_read(&snd_pcm_link_rwsem); 1677 snd_pcm_stream_lock_irq(substream); 1678 /* resume pause */ 1679 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1680 snd_pcm_pause(substream, 0); 1681 1682 /* pre-start/stop - all running streams are changed to DRAINING state */ 1683 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1684 if (result < 0) 1685 goto unlock; 1686 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1687 if (nonblock) { 1688 result = -EAGAIN; 1689 goto unlock; 1690 } 1691 1692 for (;;) { 1693 long tout; 1694 struct snd_pcm_runtime *to_check; 1695 if (signal_pending(current)) { 1696 result = -ERESTARTSYS; 1697 break; 1698 } 1699 /* find a substream to drain */ 1700 to_check = NULL; 1701 snd_pcm_group_for_each_entry(s, substream) { 1702 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1703 continue; 1704 runtime = s->runtime; 1705 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1706 to_check = runtime; 1707 break; 1708 } 1709 } 1710 if (!to_check) 1711 break; /* all drained */ 1712 init_waitqueue_entry(&wait, current); 1713 add_wait_queue(&to_check->sleep, &wait); 1714 snd_pcm_stream_unlock_irq(substream); 1715 up_read(&snd_pcm_link_rwsem); 1716 snd_power_unlock(card); 1717 if (runtime->no_period_wakeup) 1718 tout = MAX_SCHEDULE_TIMEOUT; 1719 else { 1720 tout = 10; 1721 if (runtime->rate) { 1722 long t = runtime->period_size * 2 / runtime->rate; 1723 tout = max(t, tout); 1724 } 1725 tout = msecs_to_jiffies(tout * 1000); 1726 } 1727 tout = schedule_timeout_interruptible(tout); 1728 snd_power_lock(card); 1729 down_read(&snd_pcm_link_rwsem); 1730 snd_pcm_stream_lock_irq(substream); 1731 remove_wait_queue(&to_check->sleep, &wait); 1732 if (card->shutdown) { 1733 result = -ENODEV; 1734 break; 1735 } 1736 if (tout == 0) { 1737 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1738 result = -ESTRPIPE; 1739 else { 1740 dev_dbg(substream->pcm->card->dev, 1741 "playback drain error (DMA or IRQ trouble?)\n"); 1742 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1743 result = -EIO; 1744 } 1745 break; 1746 } 1747 } 1748 1749 unlock: 1750 snd_pcm_stream_unlock_irq(substream); 1751 up_read(&snd_pcm_link_rwsem); 1752 snd_power_unlock(card); 1753 1754 return result; 1755 } 1756 1757 /* 1758 * drop ioctl 1759 * 1760 * Immediately put all linked substreams into SETUP state. 1761 */ 1762 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1763 { 1764 struct snd_pcm_runtime *runtime; 1765 int result = 0; 1766 1767 if (PCM_RUNTIME_CHECK(substream)) 1768 return -ENXIO; 1769 runtime = substream->runtime; 1770 1771 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1772 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1773 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1774 return -EBADFD; 1775 1776 snd_pcm_stream_lock_irq(substream); 1777 /* resume pause */ 1778 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1779 snd_pcm_pause(substream, 0); 1780 1781 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1782 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1783 snd_pcm_stream_unlock_irq(substream); 1784 1785 return result; 1786 } 1787 1788 1789 static bool is_pcm_file(struct file *file) 1790 { 1791 struct inode *inode = file_inode(file); 1792 unsigned int minor; 1793 1794 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1795 return false; 1796 minor = iminor(inode); 1797 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1798 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1799 } 1800 1801 /* 1802 * PCM link handling 1803 */ 1804 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1805 { 1806 int res = 0; 1807 struct snd_pcm_file *pcm_file; 1808 struct snd_pcm_substream *substream1; 1809 struct snd_pcm_group *group; 1810 struct fd f = fdget(fd); 1811 1812 if (!f.file) 1813 return -EBADFD; 1814 if (!is_pcm_file(f.file)) { 1815 res = -EBADFD; 1816 goto _badf; 1817 } 1818 pcm_file = f.file->private_data; 1819 substream1 = pcm_file->substream; 1820 group = kmalloc(sizeof(*group), GFP_KERNEL); 1821 if (!group) { 1822 res = -ENOMEM; 1823 goto _nolock; 1824 } 1825 down_write_nonblock(&snd_pcm_link_rwsem); 1826 write_lock_irq(&snd_pcm_link_rwlock); 1827 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1828 substream->runtime->status->state != substream1->runtime->status->state || 1829 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1830 res = -EBADFD; 1831 goto _end; 1832 } 1833 if (snd_pcm_stream_linked(substream1)) { 1834 res = -EALREADY; 1835 goto _end; 1836 } 1837 if (!snd_pcm_stream_linked(substream)) { 1838 substream->group = group; 1839 group = NULL; 1840 spin_lock_init(&substream->group->lock); 1841 mutex_init(&substream->group->mutex); 1842 INIT_LIST_HEAD(&substream->group->substreams); 1843 list_add_tail(&substream->link_list, &substream->group->substreams); 1844 substream->group->count = 1; 1845 } 1846 list_add_tail(&substream1->link_list, &substream->group->substreams); 1847 substream->group->count++; 1848 substream1->group = substream->group; 1849 _end: 1850 write_unlock_irq(&snd_pcm_link_rwlock); 1851 up_write(&snd_pcm_link_rwsem); 1852 _nolock: 1853 snd_card_unref(substream1->pcm->card); 1854 kfree(group); 1855 _badf: 1856 fdput(f); 1857 return res; 1858 } 1859 1860 static void relink_to_local(struct snd_pcm_substream *substream) 1861 { 1862 substream->group = &substream->self_group; 1863 INIT_LIST_HEAD(&substream->self_group.substreams); 1864 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1865 } 1866 1867 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1868 { 1869 struct snd_pcm_substream *s; 1870 int res = 0; 1871 1872 down_write_nonblock(&snd_pcm_link_rwsem); 1873 write_lock_irq(&snd_pcm_link_rwlock); 1874 if (!snd_pcm_stream_linked(substream)) { 1875 res = -EALREADY; 1876 goto _end; 1877 } 1878 list_del(&substream->link_list); 1879 substream->group->count--; 1880 if (substream->group->count == 1) { /* detach the last stream, too */ 1881 snd_pcm_group_for_each_entry(s, substream) { 1882 relink_to_local(s); 1883 break; 1884 } 1885 kfree(substream->group); 1886 } 1887 relink_to_local(substream); 1888 _end: 1889 write_unlock_irq(&snd_pcm_link_rwlock); 1890 up_write(&snd_pcm_link_rwsem); 1891 return res; 1892 } 1893 1894 /* 1895 * hw configurator 1896 */ 1897 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1898 struct snd_pcm_hw_rule *rule) 1899 { 1900 struct snd_interval t; 1901 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1902 hw_param_interval_c(params, rule->deps[1]), &t); 1903 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1904 } 1905 1906 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1907 struct snd_pcm_hw_rule *rule) 1908 { 1909 struct snd_interval t; 1910 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1911 hw_param_interval_c(params, rule->deps[1]), &t); 1912 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1913 } 1914 1915 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1916 struct snd_pcm_hw_rule *rule) 1917 { 1918 struct snd_interval t; 1919 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1920 hw_param_interval_c(params, rule->deps[1]), 1921 (unsigned long) rule->private, &t); 1922 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1923 } 1924 1925 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1926 struct snd_pcm_hw_rule *rule) 1927 { 1928 struct snd_interval t; 1929 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1930 (unsigned long) rule->private, 1931 hw_param_interval_c(params, rule->deps[1]), &t); 1932 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1933 } 1934 1935 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1936 struct snd_pcm_hw_rule *rule) 1937 { 1938 unsigned int k; 1939 const struct snd_interval *i = 1940 hw_param_interval_c(params, rule->deps[0]); 1941 struct snd_mask m; 1942 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1943 snd_mask_any(&m); 1944 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1945 int bits; 1946 if (! snd_mask_test(mask, k)) 1947 continue; 1948 bits = snd_pcm_format_physical_width(k); 1949 if (bits <= 0) 1950 continue; /* ignore invalid formats */ 1951 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1952 snd_mask_reset(&m, k); 1953 } 1954 return snd_mask_refine(mask, &m); 1955 } 1956 1957 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1958 struct snd_pcm_hw_rule *rule) 1959 { 1960 struct snd_interval t; 1961 unsigned int k; 1962 t.min = UINT_MAX; 1963 t.max = 0; 1964 t.openmin = 0; 1965 t.openmax = 0; 1966 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1967 int bits; 1968 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1969 continue; 1970 bits = snd_pcm_format_physical_width(k); 1971 if (bits <= 0) 1972 continue; /* ignore invalid formats */ 1973 if (t.min > (unsigned)bits) 1974 t.min = bits; 1975 if (t.max < (unsigned)bits) 1976 t.max = bits; 1977 } 1978 t.integer = 1; 1979 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1980 } 1981 1982 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1983 #error "Change this table" 1984 #endif 1985 1986 static const unsigned int rates[] = { 1987 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1988 48000, 64000, 88200, 96000, 176400, 192000 1989 }; 1990 1991 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1992 .count = ARRAY_SIZE(rates), 1993 .list = rates, 1994 }; 1995 1996 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1997 struct snd_pcm_hw_rule *rule) 1998 { 1999 struct snd_pcm_hardware *hw = rule->private; 2000 return snd_interval_list(hw_param_interval(params, rule->var), 2001 snd_pcm_known_rates.count, 2002 snd_pcm_known_rates.list, hw->rates); 2003 } 2004 2005 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2006 struct snd_pcm_hw_rule *rule) 2007 { 2008 struct snd_interval t; 2009 struct snd_pcm_substream *substream = rule->private; 2010 t.min = 0; 2011 t.max = substream->buffer_bytes_max; 2012 t.openmin = 0; 2013 t.openmax = 0; 2014 t.integer = 1; 2015 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2016 } 2017 2018 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2019 { 2020 struct snd_pcm_runtime *runtime = substream->runtime; 2021 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2022 int k, err; 2023 2024 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2025 snd_mask_any(constrs_mask(constrs, k)); 2026 } 2027 2028 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2029 snd_interval_any(constrs_interval(constrs, k)); 2030 } 2031 2032 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2033 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2034 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2035 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2036 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2037 2038 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2039 snd_pcm_hw_rule_format, NULL, 2040 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2041 if (err < 0) 2042 return err; 2043 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2044 snd_pcm_hw_rule_sample_bits, NULL, 2045 SNDRV_PCM_HW_PARAM_FORMAT, 2046 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2047 if (err < 0) 2048 return err; 2049 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2050 snd_pcm_hw_rule_div, NULL, 2051 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2052 if (err < 0) 2053 return err; 2054 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2055 snd_pcm_hw_rule_mul, NULL, 2056 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2057 if (err < 0) 2058 return err; 2059 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2060 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2061 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2062 if (err < 0) 2063 return err; 2064 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2065 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2066 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2067 if (err < 0) 2068 return err; 2069 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2070 snd_pcm_hw_rule_div, NULL, 2071 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2072 if (err < 0) 2073 return err; 2074 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2075 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2076 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2077 if (err < 0) 2078 return err; 2079 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2080 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2081 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2082 if (err < 0) 2083 return err; 2084 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2085 snd_pcm_hw_rule_div, NULL, 2086 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2087 if (err < 0) 2088 return err; 2089 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2090 snd_pcm_hw_rule_div, NULL, 2091 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2092 if (err < 0) 2093 return err; 2094 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2095 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2096 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2097 if (err < 0) 2098 return err; 2099 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2100 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2101 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2102 if (err < 0) 2103 return err; 2104 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2105 snd_pcm_hw_rule_mul, NULL, 2106 SNDRV_PCM_HW_PARAM_PERIOD_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_BUFFER_SIZE, 2110 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2111 SNDRV_PCM_HW_PARAM_BUFFER_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_BUFFER_SIZE, 2115 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2116 SNDRV_PCM_HW_PARAM_BUFFER_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_PERIOD_BYTES, 2120 snd_pcm_hw_rule_muldivk, (void*) 8, 2121 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2122 if (err < 0) 2123 return err; 2124 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2125 snd_pcm_hw_rule_muldivk, (void*) 8, 2126 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 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_PERIOD_TIME, 2130 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2131 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 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_BUFFER_TIME, 2135 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2136 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2137 if (err < 0) 2138 return err; 2139 return 0; 2140 } 2141 2142 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2143 { 2144 struct snd_pcm_runtime *runtime = substream->runtime; 2145 struct snd_pcm_hardware *hw = &runtime->hw; 2146 int err; 2147 unsigned int mask = 0; 2148 2149 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2150 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2151 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2152 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2153 if (hw_support_mmap(substream)) { 2154 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2155 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2156 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2157 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2158 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2159 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2160 } 2161 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2162 if (err < 0) 2163 return err; 2164 2165 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2166 if (err < 0) 2167 return err; 2168 2169 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2170 if (err < 0) 2171 return err; 2172 2173 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2174 hw->channels_min, hw->channels_max); 2175 if (err < 0) 2176 return err; 2177 2178 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2179 hw->rate_min, hw->rate_max); 2180 if (err < 0) 2181 return err; 2182 2183 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2184 hw->period_bytes_min, hw->period_bytes_max); 2185 if (err < 0) 2186 return err; 2187 2188 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2189 hw->periods_min, hw->periods_max); 2190 if (err < 0) 2191 return err; 2192 2193 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2194 hw->period_bytes_min, hw->buffer_bytes_max); 2195 if (err < 0) 2196 return err; 2197 2198 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2199 snd_pcm_hw_rule_buffer_bytes_max, substream, 2200 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2201 if (err < 0) 2202 return err; 2203 2204 /* FIXME: remove */ 2205 if (runtime->dma_bytes) { 2206 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2207 if (err < 0) 2208 return err; 2209 } 2210 2211 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2212 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2213 snd_pcm_hw_rule_rate, hw, 2214 SNDRV_PCM_HW_PARAM_RATE, -1); 2215 if (err < 0) 2216 return err; 2217 } 2218 2219 /* FIXME: this belong to lowlevel */ 2220 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2221 2222 return 0; 2223 } 2224 2225 static void pcm_release_private(struct snd_pcm_substream *substream) 2226 { 2227 snd_pcm_unlink(substream); 2228 } 2229 2230 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2231 { 2232 substream->ref_count--; 2233 if (substream->ref_count > 0) 2234 return; 2235 2236 snd_pcm_drop(substream); 2237 if (substream->hw_opened) { 2238 if (substream->ops->hw_free && 2239 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2240 substream->ops->hw_free(substream); 2241 substream->ops->close(substream); 2242 substream->hw_opened = 0; 2243 } 2244 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2245 pm_qos_remove_request(&substream->latency_pm_qos_req); 2246 if (substream->pcm_release) { 2247 substream->pcm_release(substream); 2248 substream->pcm_release = NULL; 2249 } 2250 snd_pcm_detach_substream(substream); 2251 } 2252 2253 EXPORT_SYMBOL(snd_pcm_release_substream); 2254 2255 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2256 struct file *file, 2257 struct snd_pcm_substream **rsubstream) 2258 { 2259 struct snd_pcm_substream *substream; 2260 int err; 2261 2262 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2263 if (err < 0) 2264 return err; 2265 if (substream->ref_count > 1) { 2266 *rsubstream = substream; 2267 return 0; 2268 } 2269 2270 err = snd_pcm_hw_constraints_init(substream); 2271 if (err < 0) { 2272 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2273 goto error; 2274 } 2275 2276 if ((err = substream->ops->open(substream)) < 0) 2277 goto error; 2278 2279 substream->hw_opened = 1; 2280 2281 err = snd_pcm_hw_constraints_complete(substream); 2282 if (err < 0) { 2283 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2284 goto error; 2285 } 2286 2287 *rsubstream = substream; 2288 return 0; 2289 2290 error: 2291 snd_pcm_release_substream(substream); 2292 return err; 2293 } 2294 2295 EXPORT_SYMBOL(snd_pcm_open_substream); 2296 2297 static int snd_pcm_open_file(struct file *file, 2298 struct snd_pcm *pcm, 2299 int stream) 2300 { 2301 struct snd_pcm_file *pcm_file; 2302 struct snd_pcm_substream *substream; 2303 int err; 2304 2305 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2306 if (err < 0) 2307 return err; 2308 2309 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2310 if (pcm_file == NULL) { 2311 snd_pcm_release_substream(substream); 2312 return -ENOMEM; 2313 } 2314 pcm_file->substream = substream; 2315 if (substream->ref_count == 1) { 2316 substream->file = pcm_file; 2317 substream->pcm_release = pcm_release_private; 2318 } 2319 file->private_data = pcm_file; 2320 2321 return 0; 2322 } 2323 2324 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2325 { 2326 struct snd_pcm *pcm; 2327 int err = nonseekable_open(inode, file); 2328 if (err < 0) 2329 return err; 2330 pcm = snd_lookup_minor_data(iminor(inode), 2331 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2332 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2333 if (pcm) 2334 snd_card_unref(pcm->card); 2335 return err; 2336 } 2337 2338 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2339 { 2340 struct snd_pcm *pcm; 2341 int err = nonseekable_open(inode, file); 2342 if (err < 0) 2343 return err; 2344 pcm = snd_lookup_minor_data(iminor(inode), 2345 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2346 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2347 if (pcm) 2348 snd_card_unref(pcm->card); 2349 return err; 2350 } 2351 2352 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2353 { 2354 int err; 2355 wait_queue_t wait; 2356 2357 if (pcm == NULL) { 2358 err = -ENODEV; 2359 goto __error1; 2360 } 2361 err = snd_card_file_add(pcm->card, file); 2362 if (err < 0) 2363 goto __error1; 2364 if (!try_module_get(pcm->card->module)) { 2365 err = -EFAULT; 2366 goto __error2; 2367 } 2368 init_waitqueue_entry(&wait, current); 2369 add_wait_queue(&pcm->open_wait, &wait); 2370 mutex_lock(&pcm->open_mutex); 2371 while (1) { 2372 err = snd_pcm_open_file(file, pcm, stream); 2373 if (err >= 0) 2374 break; 2375 if (err == -EAGAIN) { 2376 if (file->f_flags & O_NONBLOCK) { 2377 err = -EBUSY; 2378 break; 2379 } 2380 } else 2381 break; 2382 set_current_state(TASK_INTERRUPTIBLE); 2383 mutex_unlock(&pcm->open_mutex); 2384 schedule(); 2385 mutex_lock(&pcm->open_mutex); 2386 if (pcm->card->shutdown) { 2387 err = -ENODEV; 2388 break; 2389 } 2390 if (signal_pending(current)) { 2391 err = -ERESTARTSYS; 2392 break; 2393 } 2394 } 2395 remove_wait_queue(&pcm->open_wait, &wait); 2396 mutex_unlock(&pcm->open_mutex); 2397 if (err < 0) 2398 goto __error; 2399 return err; 2400 2401 __error: 2402 module_put(pcm->card->module); 2403 __error2: 2404 snd_card_file_remove(pcm->card, file); 2405 __error1: 2406 return err; 2407 } 2408 2409 static int snd_pcm_release(struct inode *inode, struct file *file) 2410 { 2411 struct snd_pcm *pcm; 2412 struct snd_pcm_substream *substream; 2413 struct snd_pcm_file *pcm_file; 2414 2415 pcm_file = file->private_data; 2416 substream = pcm_file->substream; 2417 if (snd_BUG_ON(!substream)) 2418 return -ENXIO; 2419 pcm = substream->pcm; 2420 mutex_lock(&pcm->open_mutex); 2421 snd_pcm_release_substream(substream); 2422 kfree(pcm_file); 2423 mutex_unlock(&pcm->open_mutex); 2424 wake_up(&pcm->open_wait); 2425 module_put(pcm->card->module); 2426 snd_card_file_remove(pcm->card, file); 2427 return 0; 2428 } 2429 2430 /* check and update PCM state; return 0 or a negative error 2431 * call this inside PCM lock 2432 */ 2433 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2434 { 2435 switch (substream->runtime->status->state) { 2436 case SNDRV_PCM_STATE_DRAINING: 2437 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2438 return -EBADFD; 2439 /* Fall through */ 2440 case SNDRV_PCM_STATE_RUNNING: 2441 return snd_pcm_update_hw_ptr(substream); 2442 case SNDRV_PCM_STATE_PREPARED: 2443 case SNDRV_PCM_STATE_PAUSED: 2444 return 0; 2445 case SNDRV_PCM_STATE_SUSPENDED: 2446 return -ESTRPIPE; 2447 case SNDRV_PCM_STATE_XRUN: 2448 return -EPIPE; 2449 default: 2450 return -EBADFD; 2451 } 2452 } 2453 2454 /* update to the given appl_ptr and call ack callback if needed; 2455 * when an error is returned, take back to the original value 2456 */ 2457 static int apply_appl_ptr(struct snd_pcm_substream *substream, 2458 snd_pcm_uframes_t appl_ptr) 2459 { 2460 struct snd_pcm_runtime *runtime = substream->runtime; 2461 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr; 2462 int ret; 2463 2464 runtime->control->appl_ptr = appl_ptr; 2465 if (substream->ops->ack) { 2466 ret = substream->ops->ack(substream); 2467 if (ret < 0) { 2468 runtime->control->appl_ptr = old_appl_ptr; 2469 return ret; 2470 } 2471 } 2472 return 0; 2473 } 2474 2475 /* increase the appl_ptr; returns the processed frames or a negative error */ 2476 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2477 snd_pcm_uframes_t frames, 2478 snd_pcm_sframes_t avail) 2479 { 2480 struct snd_pcm_runtime *runtime = substream->runtime; 2481 snd_pcm_sframes_t appl_ptr; 2482 int ret; 2483 2484 if (avail <= 0) 2485 return 0; 2486 if (frames > (snd_pcm_uframes_t)avail) 2487 frames = avail; 2488 appl_ptr = runtime->control->appl_ptr + frames; 2489 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2490 appl_ptr -= runtime->boundary; 2491 ret = apply_appl_ptr(substream, appl_ptr); 2492 return ret < 0 ? ret : frames; 2493 } 2494 2495 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2496 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2497 snd_pcm_uframes_t frames, 2498 snd_pcm_sframes_t avail) 2499 { 2500 struct snd_pcm_runtime *runtime = substream->runtime; 2501 snd_pcm_sframes_t appl_ptr; 2502 int ret; 2503 2504 if (avail <= 0) 2505 return 0; 2506 if (frames > (snd_pcm_uframes_t)avail) 2507 frames = avail; 2508 appl_ptr = runtime->control->appl_ptr - frames; 2509 if (appl_ptr < 0) 2510 appl_ptr += runtime->boundary; 2511 ret = apply_appl_ptr(substream, appl_ptr); 2512 return ret < 0 ? ret : frames; 2513 } 2514 2515 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2516 snd_pcm_uframes_t frames) 2517 { 2518 struct snd_pcm_runtime *runtime = substream->runtime; 2519 snd_pcm_sframes_t ret; 2520 2521 if (frames == 0) 2522 return 0; 2523 2524 snd_pcm_stream_lock_irq(substream); 2525 ret = do_pcm_hwsync(substream); 2526 if (!ret) 2527 ret = rewind_appl_ptr(substream, frames, 2528 snd_pcm_playback_hw_avail(runtime)); 2529 snd_pcm_stream_unlock_irq(substream); 2530 return ret; 2531 } 2532 2533 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2534 snd_pcm_uframes_t frames) 2535 { 2536 struct snd_pcm_runtime *runtime = substream->runtime; 2537 snd_pcm_sframes_t ret; 2538 2539 if (frames == 0) 2540 return 0; 2541 2542 snd_pcm_stream_lock_irq(substream); 2543 ret = do_pcm_hwsync(substream); 2544 if (!ret) 2545 ret = rewind_appl_ptr(substream, frames, 2546 snd_pcm_capture_hw_avail(runtime)); 2547 snd_pcm_stream_unlock_irq(substream); 2548 return ret; 2549 } 2550 2551 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2552 snd_pcm_uframes_t frames) 2553 { 2554 struct snd_pcm_runtime *runtime = substream->runtime; 2555 snd_pcm_sframes_t ret; 2556 2557 if (frames == 0) 2558 return 0; 2559 2560 snd_pcm_stream_lock_irq(substream); 2561 ret = do_pcm_hwsync(substream); 2562 if (!ret) 2563 ret = forward_appl_ptr(substream, frames, 2564 snd_pcm_playback_avail(runtime)); 2565 snd_pcm_stream_unlock_irq(substream); 2566 return ret; 2567 } 2568 2569 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2570 snd_pcm_uframes_t frames) 2571 { 2572 struct snd_pcm_runtime *runtime = substream->runtime; 2573 snd_pcm_sframes_t ret; 2574 2575 if (frames == 0) 2576 return 0; 2577 2578 snd_pcm_stream_lock_irq(substream); 2579 ret = do_pcm_hwsync(substream); 2580 if (!ret) 2581 ret = forward_appl_ptr(substream, frames, 2582 snd_pcm_capture_avail(runtime)); 2583 snd_pcm_stream_unlock_irq(substream); 2584 return ret; 2585 } 2586 2587 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2588 { 2589 int err; 2590 2591 snd_pcm_stream_lock_irq(substream); 2592 err = do_pcm_hwsync(substream); 2593 snd_pcm_stream_unlock_irq(substream); 2594 return err; 2595 } 2596 2597 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2598 { 2599 struct snd_pcm_runtime *runtime = substream->runtime; 2600 int err; 2601 snd_pcm_sframes_t n = 0; 2602 2603 snd_pcm_stream_lock_irq(substream); 2604 err = do_pcm_hwsync(substream); 2605 if (!err) { 2606 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2607 n = snd_pcm_playback_hw_avail(runtime); 2608 else 2609 n = snd_pcm_capture_avail(runtime); 2610 n += runtime->delay; 2611 } 2612 snd_pcm_stream_unlock_irq(substream); 2613 return err < 0 ? err : n; 2614 } 2615 2616 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2617 struct snd_pcm_sync_ptr __user *_sync_ptr) 2618 { 2619 struct snd_pcm_runtime *runtime = substream->runtime; 2620 struct snd_pcm_sync_ptr sync_ptr; 2621 volatile struct snd_pcm_mmap_status *status; 2622 volatile struct snd_pcm_mmap_control *control; 2623 int err; 2624 2625 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2626 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2627 return -EFAULT; 2628 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2629 return -EFAULT; 2630 status = runtime->status; 2631 control = runtime->control; 2632 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2633 err = snd_pcm_hwsync(substream); 2634 if (err < 0) 2635 return err; 2636 } 2637 snd_pcm_stream_lock_irq(substream); 2638 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2639 err = apply_appl_ptr(substream, sync_ptr.c.control.appl_ptr); 2640 if (err < 0) { 2641 snd_pcm_stream_unlock_irq(substream); 2642 return err; 2643 } 2644 } else { 2645 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2646 } 2647 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2648 control->avail_min = sync_ptr.c.control.avail_min; 2649 else 2650 sync_ptr.c.control.avail_min = control->avail_min; 2651 sync_ptr.s.status.state = status->state; 2652 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2653 sync_ptr.s.status.tstamp = status->tstamp; 2654 sync_ptr.s.status.suspended_state = status->suspended_state; 2655 snd_pcm_stream_unlock_irq(substream); 2656 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2657 return -EFAULT; 2658 return 0; 2659 } 2660 2661 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2662 { 2663 struct snd_pcm_runtime *runtime = substream->runtime; 2664 int arg; 2665 2666 if (get_user(arg, _arg)) 2667 return -EFAULT; 2668 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2669 return -EINVAL; 2670 runtime->tstamp_type = arg; 2671 return 0; 2672 } 2673 2674 static int snd_pcm_common_ioctl1(struct file *file, 2675 struct snd_pcm_substream *substream, 2676 unsigned int cmd, void __user *arg) 2677 { 2678 switch (cmd) { 2679 case SNDRV_PCM_IOCTL_PVERSION: 2680 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2681 case SNDRV_PCM_IOCTL_INFO: 2682 return snd_pcm_info_user(substream, arg); 2683 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2684 return 0; 2685 case SNDRV_PCM_IOCTL_TTSTAMP: 2686 return snd_pcm_tstamp(substream, arg); 2687 case SNDRV_PCM_IOCTL_HW_REFINE: 2688 return snd_pcm_hw_refine_user(substream, arg); 2689 case SNDRV_PCM_IOCTL_HW_PARAMS: 2690 return snd_pcm_hw_params_user(substream, arg); 2691 case SNDRV_PCM_IOCTL_HW_FREE: 2692 return snd_pcm_hw_free(substream); 2693 case SNDRV_PCM_IOCTL_SW_PARAMS: 2694 return snd_pcm_sw_params_user(substream, arg); 2695 case SNDRV_PCM_IOCTL_STATUS: 2696 return snd_pcm_status_user(substream, arg, false); 2697 case SNDRV_PCM_IOCTL_STATUS_EXT: 2698 return snd_pcm_status_user(substream, arg, true); 2699 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2700 return snd_pcm_channel_info_user(substream, arg); 2701 case SNDRV_PCM_IOCTL_PREPARE: 2702 return snd_pcm_prepare(substream, file); 2703 case SNDRV_PCM_IOCTL_RESET: 2704 return snd_pcm_reset(substream); 2705 case SNDRV_PCM_IOCTL_START: 2706 return snd_pcm_start_lock_irq(substream); 2707 case SNDRV_PCM_IOCTL_LINK: 2708 return snd_pcm_link(substream, (int)(unsigned long) arg); 2709 case SNDRV_PCM_IOCTL_UNLINK: 2710 return snd_pcm_unlink(substream); 2711 case SNDRV_PCM_IOCTL_RESUME: 2712 return snd_pcm_resume(substream); 2713 case SNDRV_PCM_IOCTL_XRUN: 2714 return snd_pcm_xrun(substream); 2715 case SNDRV_PCM_IOCTL_HWSYNC: 2716 return snd_pcm_hwsync(substream); 2717 case SNDRV_PCM_IOCTL_DELAY: 2718 { 2719 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2720 snd_pcm_sframes_t __user *res = arg; 2721 2722 if (delay < 0) 2723 return delay; 2724 if (put_user(delay, res)) 2725 return -EFAULT; 2726 return 0; 2727 } 2728 case SNDRV_PCM_IOCTL_SYNC_PTR: 2729 return snd_pcm_sync_ptr(substream, arg); 2730 #ifdef CONFIG_SND_SUPPORT_OLD_API 2731 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2732 return snd_pcm_hw_refine_old_user(substream, arg); 2733 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2734 return snd_pcm_hw_params_old_user(substream, arg); 2735 #endif 2736 case SNDRV_PCM_IOCTL_DRAIN: 2737 return snd_pcm_drain(substream, file); 2738 case SNDRV_PCM_IOCTL_DROP: 2739 return snd_pcm_drop(substream); 2740 case SNDRV_PCM_IOCTL_PAUSE: 2741 { 2742 int res; 2743 snd_pcm_stream_lock_irq(substream); 2744 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2745 snd_pcm_stream_unlock_irq(substream); 2746 return res; 2747 } 2748 } 2749 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2750 return -ENOTTY; 2751 } 2752 2753 static int snd_pcm_playback_ioctl1(struct file *file, 2754 struct snd_pcm_substream *substream, 2755 unsigned int cmd, void __user *arg) 2756 { 2757 if (snd_BUG_ON(!substream)) 2758 return -ENXIO; 2759 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2760 return -EINVAL; 2761 switch (cmd) { 2762 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2763 { 2764 struct snd_xferi xferi; 2765 struct snd_xferi __user *_xferi = arg; 2766 struct snd_pcm_runtime *runtime = substream->runtime; 2767 snd_pcm_sframes_t result; 2768 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2769 return -EBADFD; 2770 if (put_user(0, &_xferi->result)) 2771 return -EFAULT; 2772 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2773 return -EFAULT; 2774 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2775 __put_user(result, &_xferi->result); 2776 return result < 0 ? result : 0; 2777 } 2778 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2779 { 2780 struct snd_xfern xfern; 2781 struct snd_xfern __user *_xfern = arg; 2782 struct snd_pcm_runtime *runtime = substream->runtime; 2783 void __user **bufs; 2784 snd_pcm_sframes_t result; 2785 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2786 return -EBADFD; 2787 if (runtime->channels > 128) 2788 return -EINVAL; 2789 if (put_user(0, &_xfern->result)) 2790 return -EFAULT; 2791 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2792 return -EFAULT; 2793 2794 bufs = memdup_user(xfern.bufs, 2795 sizeof(void *) * runtime->channels); 2796 if (IS_ERR(bufs)) 2797 return PTR_ERR(bufs); 2798 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2799 kfree(bufs); 2800 __put_user(result, &_xfern->result); 2801 return result < 0 ? result : 0; 2802 } 2803 case SNDRV_PCM_IOCTL_REWIND: 2804 { 2805 snd_pcm_uframes_t frames; 2806 snd_pcm_uframes_t __user *_frames = arg; 2807 snd_pcm_sframes_t result; 2808 if (get_user(frames, _frames)) 2809 return -EFAULT; 2810 if (put_user(0, _frames)) 2811 return -EFAULT; 2812 result = snd_pcm_playback_rewind(substream, frames); 2813 __put_user(result, _frames); 2814 return result < 0 ? result : 0; 2815 } 2816 case SNDRV_PCM_IOCTL_FORWARD: 2817 { 2818 snd_pcm_uframes_t frames; 2819 snd_pcm_uframes_t __user *_frames = arg; 2820 snd_pcm_sframes_t result; 2821 if (get_user(frames, _frames)) 2822 return -EFAULT; 2823 if (put_user(0, _frames)) 2824 return -EFAULT; 2825 result = snd_pcm_playback_forward(substream, frames); 2826 __put_user(result, _frames); 2827 return result < 0 ? result : 0; 2828 } 2829 } 2830 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2831 } 2832 2833 static int snd_pcm_capture_ioctl1(struct file *file, 2834 struct snd_pcm_substream *substream, 2835 unsigned int cmd, void __user *arg) 2836 { 2837 if (snd_BUG_ON(!substream)) 2838 return -ENXIO; 2839 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2840 return -EINVAL; 2841 switch (cmd) { 2842 case SNDRV_PCM_IOCTL_READI_FRAMES: 2843 { 2844 struct snd_xferi xferi; 2845 struct snd_xferi __user *_xferi = arg; 2846 struct snd_pcm_runtime *runtime = substream->runtime; 2847 snd_pcm_sframes_t result; 2848 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2849 return -EBADFD; 2850 if (put_user(0, &_xferi->result)) 2851 return -EFAULT; 2852 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2853 return -EFAULT; 2854 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2855 __put_user(result, &_xferi->result); 2856 return result < 0 ? result : 0; 2857 } 2858 case SNDRV_PCM_IOCTL_READN_FRAMES: 2859 { 2860 struct snd_xfern xfern; 2861 struct snd_xfern __user *_xfern = arg; 2862 struct snd_pcm_runtime *runtime = substream->runtime; 2863 void *bufs; 2864 snd_pcm_sframes_t result; 2865 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2866 return -EBADFD; 2867 if (runtime->channels > 128) 2868 return -EINVAL; 2869 if (put_user(0, &_xfern->result)) 2870 return -EFAULT; 2871 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2872 return -EFAULT; 2873 2874 bufs = memdup_user(xfern.bufs, 2875 sizeof(void *) * runtime->channels); 2876 if (IS_ERR(bufs)) 2877 return PTR_ERR(bufs); 2878 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2879 kfree(bufs); 2880 __put_user(result, &_xfern->result); 2881 return result < 0 ? result : 0; 2882 } 2883 case SNDRV_PCM_IOCTL_REWIND: 2884 { 2885 snd_pcm_uframes_t frames; 2886 snd_pcm_uframes_t __user *_frames = arg; 2887 snd_pcm_sframes_t result; 2888 if (get_user(frames, _frames)) 2889 return -EFAULT; 2890 if (put_user(0, _frames)) 2891 return -EFAULT; 2892 result = snd_pcm_capture_rewind(substream, frames); 2893 __put_user(result, _frames); 2894 return result < 0 ? result : 0; 2895 } 2896 case SNDRV_PCM_IOCTL_FORWARD: 2897 { 2898 snd_pcm_uframes_t frames; 2899 snd_pcm_uframes_t __user *_frames = arg; 2900 snd_pcm_sframes_t result; 2901 if (get_user(frames, _frames)) 2902 return -EFAULT; 2903 if (put_user(0, _frames)) 2904 return -EFAULT; 2905 result = snd_pcm_capture_forward(substream, frames); 2906 __put_user(result, _frames); 2907 return result < 0 ? result : 0; 2908 } 2909 } 2910 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2911 } 2912 2913 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2914 unsigned long arg) 2915 { 2916 struct snd_pcm_file *pcm_file; 2917 2918 pcm_file = file->private_data; 2919 2920 if (((cmd >> 8) & 0xff) != 'A') 2921 return -ENOTTY; 2922 2923 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2924 (void __user *)arg); 2925 } 2926 2927 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2928 unsigned long arg) 2929 { 2930 struct snd_pcm_file *pcm_file; 2931 2932 pcm_file = file->private_data; 2933 2934 if (((cmd >> 8) & 0xff) != 'A') 2935 return -ENOTTY; 2936 2937 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2938 (void __user *)arg); 2939 } 2940 2941 /** 2942 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2943 * @substream: PCM substream 2944 * @cmd: IOCTL cmd 2945 * @arg: IOCTL argument 2946 * 2947 * The function is provided primarily for OSS layer and USB gadget drivers, 2948 * and it allows only the limited set of ioctls (hw_params, sw_params, 2949 * prepare, start, drain, drop, forward). 2950 */ 2951 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2952 unsigned int cmd, void *arg) 2953 { 2954 snd_pcm_uframes_t *frames = arg; 2955 snd_pcm_sframes_t result; 2956 2957 switch (cmd) { 2958 case SNDRV_PCM_IOCTL_FORWARD: 2959 { 2960 /* provided only for OSS; capture-only and no value returned */ 2961 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 2962 return -EINVAL; 2963 result = snd_pcm_capture_forward(substream, *frames); 2964 return result < 0 ? result : 0; 2965 } 2966 case SNDRV_PCM_IOCTL_HW_PARAMS: 2967 return snd_pcm_hw_params(substream, arg); 2968 case SNDRV_PCM_IOCTL_SW_PARAMS: 2969 return snd_pcm_sw_params(substream, arg); 2970 case SNDRV_PCM_IOCTL_PREPARE: 2971 return snd_pcm_prepare(substream, NULL); 2972 case SNDRV_PCM_IOCTL_START: 2973 return snd_pcm_start_lock_irq(substream); 2974 case SNDRV_PCM_IOCTL_DRAIN: 2975 return snd_pcm_drain(substream, NULL); 2976 case SNDRV_PCM_IOCTL_DROP: 2977 return snd_pcm_drop(substream); 2978 case SNDRV_PCM_IOCTL_DELAY: 2979 { 2980 result = snd_pcm_delay(substream); 2981 if (result < 0) 2982 return result; 2983 *frames = result; 2984 return 0; 2985 } 2986 default: 2987 return -EINVAL; 2988 } 2989 } 2990 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2991 2992 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2993 loff_t * offset) 2994 { 2995 struct snd_pcm_file *pcm_file; 2996 struct snd_pcm_substream *substream; 2997 struct snd_pcm_runtime *runtime; 2998 snd_pcm_sframes_t result; 2999 3000 pcm_file = file->private_data; 3001 substream = pcm_file->substream; 3002 if (PCM_RUNTIME_CHECK(substream)) 3003 return -ENXIO; 3004 runtime = substream->runtime; 3005 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3006 return -EBADFD; 3007 if (!frame_aligned(runtime, count)) 3008 return -EINVAL; 3009 count = bytes_to_frames(runtime, count); 3010 result = snd_pcm_lib_read(substream, buf, count); 3011 if (result > 0) 3012 result = frames_to_bytes(runtime, result); 3013 return result; 3014 } 3015 3016 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3017 size_t count, loff_t * offset) 3018 { 3019 struct snd_pcm_file *pcm_file; 3020 struct snd_pcm_substream *substream; 3021 struct snd_pcm_runtime *runtime; 3022 snd_pcm_sframes_t result; 3023 3024 pcm_file = file->private_data; 3025 substream = pcm_file->substream; 3026 if (PCM_RUNTIME_CHECK(substream)) 3027 return -ENXIO; 3028 runtime = substream->runtime; 3029 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3030 return -EBADFD; 3031 if (!frame_aligned(runtime, count)) 3032 return -EINVAL; 3033 count = bytes_to_frames(runtime, count); 3034 result = snd_pcm_lib_write(substream, buf, count); 3035 if (result > 0) 3036 result = frames_to_bytes(runtime, result); 3037 return result; 3038 } 3039 3040 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3041 { 3042 struct snd_pcm_file *pcm_file; 3043 struct snd_pcm_substream *substream; 3044 struct snd_pcm_runtime *runtime; 3045 snd_pcm_sframes_t result; 3046 unsigned long i; 3047 void __user **bufs; 3048 snd_pcm_uframes_t frames; 3049 3050 pcm_file = iocb->ki_filp->private_data; 3051 substream = pcm_file->substream; 3052 if (PCM_RUNTIME_CHECK(substream)) 3053 return -ENXIO; 3054 runtime = substream->runtime; 3055 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3056 return -EBADFD; 3057 if (!iter_is_iovec(to)) 3058 return -EINVAL; 3059 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3060 return -EINVAL; 3061 if (!frame_aligned(runtime, to->iov->iov_len)) 3062 return -EINVAL; 3063 frames = bytes_to_samples(runtime, to->iov->iov_len); 3064 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3065 if (bufs == NULL) 3066 return -ENOMEM; 3067 for (i = 0; i < to->nr_segs; ++i) 3068 bufs[i] = to->iov[i].iov_base; 3069 result = snd_pcm_lib_readv(substream, bufs, frames); 3070 if (result > 0) 3071 result = frames_to_bytes(runtime, result); 3072 kfree(bufs); 3073 return result; 3074 } 3075 3076 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3077 { 3078 struct snd_pcm_file *pcm_file; 3079 struct snd_pcm_substream *substream; 3080 struct snd_pcm_runtime *runtime; 3081 snd_pcm_sframes_t result; 3082 unsigned long i; 3083 void __user **bufs; 3084 snd_pcm_uframes_t frames; 3085 3086 pcm_file = iocb->ki_filp->private_data; 3087 substream = pcm_file->substream; 3088 if (PCM_RUNTIME_CHECK(substream)) 3089 return -ENXIO; 3090 runtime = substream->runtime; 3091 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3092 return -EBADFD; 3093 if (!iter_is_iovec(from)) 3094 return -EINVAL; 3095 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3096 !frame_aligned(runtime, from->iov->iov_len)) 3097 return -EINVAL; 3098 frames = bytes_to_samples(runtime, from->iov->iov_len); 3099 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3100 if (bufs == NULL) 3101 return -ENOMEM; 3102 for (i = 0; i < from->nr_segs; ++i) 3103 bufs[i] = from->iov[i].iov_base; 3104 result = snd_pcm_lib_writev(substream, bufs, frames); 3105 if (result > 0) 3106 result = frames_to_bytes(runtime, result); 3107 kfree(bufs); 3108 return result; 3109 } 3110 3111 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3112 { 3113 struct snd_pcm_file *pcm_file; 3114 struct snd_pcm_substream *substream; 3115 struct snd_pcm_runtime *runtime; 3116 unsigned int mask; 3117 snd_pcm_uframes_t avail; 3118 3119 pcm_file = file->private_data; 3120 3121 substream = pcm_file->substream; 3122 if (PCM_RUNTIME_CHECK(substream)) 3123 return POLLOUT | POLLWRNORM | POLLERR; 3124 runtime = substream->runtime; 3125 3126 poll_wait(file, &runtime->sleep, wait); 3127 3128 snd_pcm_stream_lock_irq(substream); 3129 avail = snd_pcm_playback_avail(runtime); 3130 switch (runtime->status->state) { 3131 case SNDRV_PCM_STATE_RUNNING: 3132 case SNDRV_PCM_STATE_PREPARED: 3133 case SNDRV_PCM_STATE_PAUSED: 3134 if (avail >= runtime->control->avail_min) { 3135 mask = POLLOUT | POLLWRNORM; 3136 break; 3137 } 3138 /* Fall through */ 3139 case SNDRV_PCM_STATE_DRAINING: 3140 mask = 0; 3141 break; 3142 default: 3143 mask = POLLOUT | POLLWRNORM | POLLERR; 3144 break; 3145 } 3146 snd_pcm_stream_unlock_irq(substream); 3147 return mask; 3148 } 3149 3150 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3151 { 3152 struct snd_pcm_file *pcm_file; 3153 struct snd_pcm_substream *substream; 3154 struct snd_pcm_runtime *runtime; 3155 unsigned int mask; 3156 snd_pcm_uframes_t avail; 3157 3158 pcm_file = file->private_data; 3159 3160 substream = pcm_file->substream; 3161 if (PCM_RUNTIME_CHECK(substream)) 3162 return POLLIN | POLLRDNORM | POLLERR; 3163 runtime = substream->runtime; 3164 3165 poll_wait(file, &runtime->sleep, wait); 3166 3167 snd_pcm_stream_lock_irq(substream); 3168 avail = snd_pcm_capture_avail(runtime); 3169 switch (runtime->status->state) { 3170 case SNDRV_PCM_STATE_RUNNING: 3171 case SNDRV_PCM_STATE_PREPARED: 3172 case SNDRV_PCM_STATE_PAUSED: 3173 if (avail >= runtime->control->avail_min) { 3174 mask = POLLIN | POLLRDNORM; 3175 break; 3176 } 3177 mask = 0; 3178 break; 3179 case SNDRV_PCM_STATE_DRAINING: 3180 if (avail > 0) { 3181 mask = POLLIN | POLLRDNORM; 3182 break; 3183 } 3184 /* Fall through */ 3185 default: 3186 mask = POLLIN | POLLRDNORM | POLLERR; 3187 break; 3188 } 3189 snd_pcm_stream_unlock_irq(substream); 3190 return mask; 3191 } 3192 3193 /* 3194 * mmap support 3195 */ 3196 3197 /* 3198 * Only on coherent architectures, we can mmap the status and the control records 3199 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3200 */ 3201 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3202 /* 3203 * mmap status record 3204 */ 3205 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3206 { 3207 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3208 struct snd_pcm_runtime *runtime; 3209 3210 if (substream == NULL) 3211 return VM_FAULT_SIGBUS; 3212 runtime = substream->runtime; 3213 vmf->page = virt_to_page(runtime->status); 3214 get_page(vmf->page); 3215 return 0; 3216 } 3217 3218 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3219 { 3220 .fault = snd_pcm_mmap_status_fault, 3221 }; 3222 3223 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3224 struct vm_area_struct *area) 3225 { 3226 long size; 3227 if (!(area->vm_flags & VM_READ)) 3228 return -EINVAL; 3229 size = area->vm_end - area->vm_start; 3230 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3231 return -EINVAL; 3232 area->vm_ops = &snd_pcm_vm_ops_status; 3233 area->vm_private_data = substream; 3234 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3235 return 0; 3236 } 3237 3238 /* 3239 * mmap control record 3240 */ 3241 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3242 { 3243 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3244 struct snd_pcm_runtime *runtime; 3245 3246 if (substream == NULL) 3247 return VM_FAULT_SIGBUS; 3248 runtime = substream->runtime; 3249 vmf->page = virt_to_page(runtime->control); 3250 get_page(vmf->page); 3251 return 0; 3252 } 3253 3254 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3255 { 3256 .fault = snd_pcm_mmap_control_fault, 3257 }; 3258 3259 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3260 struct vm_area_struct *area) 3261 { 3262 long size; 3263 if (!(area->vm_flags & VM_READ)) 3264 return -EINVAL; 3265 size = area->vm_end - area->vm_start; 3266 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3267 return -EINVAL; 3268 area->vm_ops = &snd_pcm_vm_ops_control; 3269 area->vm_private_data = substream; 3270 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3271 return 0; 3272 } 3273 #else /* ! coherent mmap */ 3274 /* 3275 * don't support mmap for status and control records. 3276 */ 3277 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3278 struct vm_area_struct *area) 3279 { 3280 return -ENXIO; 3281 } 3282 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3283 struct vm_area_struct *area) 3284 { 3285 return -ENXIO; 3286 } 3287 #endif /* coherent mmap */ 3288 3289 static inline struct page * 3290 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3291 { 3292 void *vaddr = substream->runtime->dma_area + ofs; 3293 return virt_to_page(vaddr); 3294 } 3295 3296 /* 3297 * fault callback for mmapping a RAM page 3298 */ 3299 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3300 { 3301 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3302 struct snd_pcm_runtime *runtime; 3303 unsigned long offset; 3304 struct page * page; 3305 size_t dma_bytes; 3306 3307 if (substream == NULL) 3308 return VM_FAULT_SIGBUS; 3309 runtime = substream->runtime; 3310 offset = vmf->pgoff << PAGE_SHIFT; 3311 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3312 if (offset > dma_bytes - PAGE_SIZE) 3313 return VM_FAULT_SIGBUS; 3314 if (substream->ops->page) 3315 page = substream->ops->page(substream, offset); 3316 else 3317 page = snd_pcm_default_page_ops(substream, offset); 3318 if (!page) 3319 return VM_FAULT_SIGBUS; 3320 get_page(page); 3321 vmf->page = page; 3322 return 0; 3323 } 3324 3325 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3326 .open = snd_pcm_mmap_data_open, 3327 .close = snd_pcm_mmap_data_close, 3328 }; 3329 3330 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3331 .open = snd_pcm_mmap_data_open, 3332 .close = snd_pcm_mmap_data_close, 3333 .fault = snd_pcm_mmap_data_fault, 3334 }; 3335 3336 /* 3337 * mmap the DMA buffer on RAM 3338 */ 3339 3340 /** 3341 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3342 * @substream: PCM substream 3343 * @area: VMA 3344 * 3345 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3346 * this function is invoked implicitly. 3347 */ 3348 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3349 struct vm_area_struct *area) 3350 { 3351 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3352 #ifdef CONFIG_GENERIC_ALLOCATOR 3353 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3354 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3355 return remap_pfn_range(area, area->vm_start, 3356 substream->dma_buffer.addr >> PAGE_SHIFT, 3357 area->vm_end - area->vm_start, area->vm_page_prot); 3358 } 3359 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3360 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3361 if (!substream->ops->page && 3362 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3363 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3364 area, 3365 substream->runtime->dma_area, 3366 substream->runtime->dma_addr, 3367 area->vm_end - area->vm_start); 3368 #endif /* CONFIG_X86 */ 3369 /* mmap with fault handler */ 3370 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3371 return 0; 3372 } 3373 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3374 3375 /* 3376 * mmap the DMA buffer on I/O memory area 3377 */ 3378 #if SNDRV_PCM_INFO_MMAP_IOMEM 3379 /** 3380 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3381 * @substream: PCM substream 3382 * @area: VMA 3383 * 3384 * When your hardware uses the iomapped pages as the hardware buffer and 3385 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3386 * is supposed to work only on limited architectures. 3387 */ 3388 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3389 struct vm_area_struct *area) 3390 { 3391 struct snd_pcm_runtime *runtime = substream->runtime;; 3392 3393 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3394 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3395 } 3396 3397 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3398 #endif /* SNDRV_PCM_INFO_MMAP */ 3399 3400 /* 3401 * mmap DMA buffer 3402 */ 3403 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3404 struct vm_area_struct *area) 3405 { 3406 struct snd_pcm_runtime *runtime; 3407 long size; 3408 unsigned long offset; 3409 size_t dma_bytes; 3410 int err; 3411 3412 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3413 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3414 return -EINVAL; 3415 } else { 3416 if (!(area->vm_flags & VM_READ)) 3417 return -EINVAL; 3418 } 3419 runtime = substream->runtime; 3420 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3421 return -EBADFD; 3422 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3423 return -ENXIO; 3424 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3425 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3426 return -EINVAL; 3427 size = area->vm_end - area->vm_start; 3428 offset = area->vm_pgoff << PAGE_SHIFT; 3429 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3430 if ((size_t)size > dma_bytes) 3431 return -EINVAL; 3432 if (offset > dma_bytes - size) 3433 return -EINVAL; 3434 3435 area->vm_ops = &snd_pcm_vm_ops_data; 3436 area->vm_private_data = substream; 3437 if (substream->ops->mmap) 3438 err = substream->ops->mmap(substream, area); 3439 else 3440 err = snd_pcm_lib_default_mmap(substream, area); 3441 if (!err) 3442 atomic_inc(&substream->mmap_count); 3443 return err; 3444 } 3445 3446 EXPORT_SYMBOL(snd_pcm_mmap_data); 3447 3448 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3449 { 3450 struct snd_pcm_file * pcm_file; 3451 struct snd_pcm_substream *substream; 3452 unsigned long offset; 3453 3454 pcm_file = file->private_data; 3455 substream = pcm_file->substream; 3456 if (PCM_RUNTIME_CHECK(substream)) 3457 return -ENXIO; 3458 3459 offset = area->vm_pgoff << PAGE_SHIFT; 3460 switch (offset) { 3461 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3462 if (pcm_file->no_compat_mmap) 3463 return -ENXIO; 3464 return snd_pcm_mmap_status(substream, file, area); 3465 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3466 if (pcm_file->no_compat_mmap) 3467 return -ENXIO; 3468 return snd_pcm_mmap_control(substream, file, area); 3469 default: 3470 return snd_pcm_mmap_data(substream, file, area); 3471 } 3472 return 0; 3473 } 3474 3475 static int snd_pcm_fasync(int fd, struct file * file, int on) 3476 { 3477 struct snd_pcm_file * pcm_file; 3478 struct snd_pcm_substream *substream; 3479 struct snd_pcm_runtime *runtime; 3480 3481 pcm_file = file->private_data; 3482 substream = pcm_file->substream; 3483 if (PCM_RUNTIME_CHECK(substream)) 3484 return -ENXIO; 3485 runtime = substream->runtime; 3486 return fasync_helper(fd, file, on, &runtime->fasync); 3487 } 3488 3489 /* 3490 * ioctl32 compat 3491 */ 3492 #ifdef CONFIG_COMPAT 3493 #include "pcm_compat.c" 3494 #else 3495 #define snd_pcm_ioctl_compat NULL 3496 #endif 3497 3498 /* 3499 * To be removed helpers to keep binary compatibility 3500 */ 3501 3502 #ifdef CONFIG_SND_SUPPORT_OLD_API 3503 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3504 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3505 3506 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3507 struct snd_pcm_hw_params_old *oparams) 3508 { 3509 unsigned int i; 3510 3511 memset(params, 0, sizeof(*params)); 3512 params->flags = oparams->flags; 3513 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3514 params->masks[i].bits[0] = oparams->masks[i]; 3515 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3516 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3517 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3518 params->info = oparams->info; 3519 params->msbits = oparams->msbits; 3520 params->rate_num = oparams->rate_num; 3521 params->rate_den = oparams->rate_den; 3522 params->fifo_size = oparams->fifo_size; 3523 } 3524 3525 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3526 struct snd_pcm_hw_params *params) 3527 { 3528 unsigned int i; 3529 3530 memset(oparams, 0, sizeof(*oparams)); 3531 oparams->flags = params->flags; 3532 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3533 oparams->masks[i] = params->masks[i].bits[0]; 3534 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3535 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3536 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3537 oparams->info = params->info; 3538 oparams->msbits = params->msbits; 3539 oparams->rate_num = params->rate_num; 3540 oparams->rate_den = params->rate_den; 3541 oparams->fifo_size = params->fifo_size; 3542 } 3543 3544 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3545 struct snd_pcm_hw_params_old __user * _oparams) 3546 { 3547 struct snd_pcm_hw_params *params; 3548 struct snd_pcm_hw_params_old *oparams = NULL; 3549 int err; 3550 3551 params = kmalloc(sizeof(*params), GFP_KERNEL); 3552 if (!params) 3553 return -ENOMEM; 3554 3555 oparams = memdup_user(_oparams, sizeof(*oparams)); 3556 if (IS_ERR(oparams)) { 3557 err = PTR_ERR(oparams); 3558 goto out; 3559 } 3560 snd_pcm_hw_convert_from_old_params(params, oparams); 3561 err = snd_pcm_hw_refine(substream, params); 3562 snd_pcm_hw_convert_to_old_params(oparams, params); 3563 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3564 if (!err) 3565 err = -EFAULT; 3566 } 3567 3568 kfree(oparams); 3569 out: 3570 kfree(params); 3571 return err; 3572 } 3573 3574 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3575 struct snd_pcm_hw_params_old __user * _oparams) 3576 { 3577 struct snd_pcm_hw_params *params; 3578 struct snd_pcm_hw_params_old *oparams = NULL; 3579 int err; 3580 3581 params = kmalloc(sizeof(*params), GFP_KERNEL); 3582 if (!params) 3583 return -ENOMEM; 3584 3585 oparams = memdup_user(_oparams, sizeof(*oparams)); 3586 if (IS_ERR(oparams)) { 3587 err = PTR_ERR(oparams); 3588 goto out; 3589 } 3590 snd_pcm_hw_convert_from_old_params(params, oparams); 3591 err = snd_pcm_hw_params(substream, params); 3592 snd_pcm_hw_convert_to_old_params(oparams, params); 3593 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3594 if (!err) 3595 err = -EFAULT; 3596 } 3597 3598 kfree(oparams); 3599 out: 3600 kfree(params); 3601 return err; 3602 } 3603 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3604 3605 #ifndef CONFIG_MMU 3606 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3607 unsigned long addr, 3608 unsigned long len, 3609 unsigned long pgoff, 3610 unsigned long flags) 3611 { 3612 struct snd_pcm_file *pcm_file = file->private_data; 3613 struct snd_pcm_substream *substream = pcm_file->substream; 3614 struct snd_pcm_runtime *runtime = substream->runtime; 3615 unsigned long offset = pgoff << PAGE_SHIFT; 3616 3617 switch (offset) { 3618 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3619 return (unsigned long)runtime->status; 3620 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3621 return (unsigned long)runtime->control; 3622 default: 3623 return (unsigned long)runtime->dma_area + offset; 3624 } 3625 } 3626 #else 3627 # define snd_pcm_get_unmapped_area NULL 3628 #endif 3629 3630 /* 3631 * Register section 3632 */ 3633 3634 const struct file_operations snd_pcm_f_ops[2] = { 3635 { 3636 .owner = THIS_MODULE, 3637 .write = snd_pcm_write, 3638 .write_iter = snd_pcm_writev, 3639 .open = snd_pcm_playback_open, 3640 .release = snd_pcm_release, 3641 .llseek = no_llseek, 3642 .poll = snd_pcm_playback_poll, 3643 .unlocked_ioctl = snd_pcm_playback_ioctl, 3644 .compat_ioctl = snd_pcm_ioctl_compat, 3645 .mmap = snd_pcm_mmap, 3646 .fasync = snd_pcm_fasync, 3647 .get_unmapped_area = snd_pcm_get_unmapped_area, 3648 }, 3649 { 3650 .owner = THIS_MODULE, 3651 .read = snd_pcm_read, 3652 .read_iter = snd_pcm_readv, 3653 .open = snd_pcm_capture_open, 3654 .release = snd_pcm_release, 3655 .llseek = no_llseek, 3656 .poll = snd_pcm_capture_poll, 3657 .unlocked_ioctl = snd_pcm_capture_ioctl, 3658 .compat_ioctl = snd_pcm_ioctl_compat, 3659 .mmap = snd_pcm_mmap, 3660 .fasync = snd_pcm_fasync, 3661 .get_unmapped_area = snd_pcm_get_unmapped_area, 3662 } 3663 }; 3664