1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/sched/signal.h> 27 #include <linux/time.h> 28 #include <linux/pm_qos.h> 29 #include <linux/io.h> 30 #include <linux/dma-mapping.h> 31 #include <sound/core.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/timer.h> 37 #include <sound/minors.h> 38 #include <linux/uio.h> 39 40 #include "pcm_local.h" 41 42 #ifdef CONFIG_SND_DEBUG 43 #define CREATE_TRACE_POINTS 44 #include "pcm_param_trace.h" 45 #else 46 #define trace_hw_mask_param_enabled() 0 47 #define trace_hw_interval_param_enabled() 0 48 #define trace_hw_mask_param(substream, type, index, prev, curr) 49 #define trace_hw_interval_param(substream, type, index, prev, curr) 50 #endif 51 52 /* 53 * Compatibility 54 */ 55 56 struct snd_pcm_hw_params_old { 57 unsigned int flags; 58 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 59 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 60 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 61 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 62 unsigned int rmask; 63 unsigned int cmask; 64 unsigned int info; 65 unsigned int msbits; 66 unsigned int rate_num; 67 unsigned int rate_den; 68 snd_pcm_uframes_t fifo_size; 69 unsigned char reserved[64]; 70 }; 71 72 #ifdef CONFIG_SND_SUPPORT_OLD_API 73 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 74 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 75 76 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 77 struct snd_pcm_hw_params_old __user * _oparams); 78 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 79 struct snd_pcm_hw_params_old __user * _oparams); 80 #endif 81 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 82 83 /* 84 * 85 */ 86 87 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 88 static DECLARE_RWSEM(snd_pcm_link_rwsem); 89 90 /* Writer in rwsem may block readers even during its waiting in queue, 91 * and this may lead to a deadlock when the code path takes read sem 92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 94 * spin until it gets the lock. 95 */ 96 static inline void down_write_nonblock(struct rw_semaphore *lock) 97 { 98 while (!down_write_trylock(lock)) 99 cond_resched(); 100 } 101 102 /** 103 * snd_pcm_stream_lock - Lock the PCM stream 104 * @substream: PCM substream 105 * 106 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 107 * flag of the given substream. This also takes the global link rw lock 108 * (or rw sem), too, for avoiding the race with linked streams. 109 */ 110 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 111 { 112 if (substream->pcm->nonatomic) { 113 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 114 mutex_lock(&substream->self_group.mutex); 115 } else { 116 read_lock(&snd_pcm_link_rwlock); 117 spin_lock(&substream->self_group.lock); 118 } 119 } 120 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 121 122 /** 123 * snd_pcm_stream_lock - Unlock the PCM stream 124 * @substream: PCM substream 125 * 126 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 127 */ 128 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 129 { 130 if (substream->pcm->nonatomic) { 131 mutex_unlock(&substream->self_group.mutex); 132 up_read(&snd_pcm_link_rwsem); 133 } else { 134 spin_unlock(&substream->self_group.lock); 135 read_unlock(&snd_pcm_link_rwlock); 136 } 137 } 138 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 139 140 /** 141 * snd_pcm_stream_lock_irq - Lock the PCM stream 142 * @substream: PCM substream 143 * 144 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 145 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 146 * as snd_pcm_stream_lock(). 147 */ 148 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 149 { 150 if (!substream->pcm->nonatomic) 151 local_irq_disable(); 152 snd_pcm_stream_lock(substream); 153 } 154 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 155 156 /** 157 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 158 * @substream: PCM substream 159 * 160 * This is a counter-part of snd_pcm_stream_lock_irq(). 161 */ 162 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 163 { 164 snd_pcm_stream_unlock(substream); 165 if (!substream->pcm->nonatomic) 166 local_irq_enable(); 167 } 168 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 169 170 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 171 { 172 unsigned long flags = 0; 173 if (!substream->pcm->nonatomic) 174 local_irq_save(flags); 175 snd_pcm_stream_lock(substream); 176 return flags; 177 } 178 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 179 180 /** 181 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 182 * @substream: PCM substream 183 * @flags: irq flags 184 * 185 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 186 */ 187 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 188 unsigned long flags) 189 { 190 snd_pcm_stream_unlock(substream); 191 if (!substream->pcm->nonatomic) 192 local_irq_restore(flags); 193 } 194 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 195 196 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 197 { 198 struct snd_pcm *pcm = substream->pcm; 199 struct snd_pcm_str *pstr = substream->pstr; 200 201 memset(info, 0, sizeof(*info)); 202 info->card = pcm->card->number; 203 info->device = pcm->device; 204 info->stream = substream->stream; 205 info->subdevice = substream->number; 206 strlcpy(info->id, pcm->id, sizeof(info->id)); 207 strlcpy(info->name, pcm->name, sizeof(info->name)); 208 info->dev_class = pcm->dev_class; 209 info->dev_subclass = pcm->dev_subclass; 210 info->subdevices_count = pstr->substream_count; 211 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 212 strlcpy(info->subname, substream->name, sizeof(info->subname)); 213 214 return 0; 215 } 216 217 int snd_pcm_info_user(struct snd_pcm_substream *substream, 218 struct snd_pcm_info __user * _info) 219 { 220 struct snd_pcm_info *info; 221 int err; 222 223 info = kmalloc(sizeof(*info), GFP_KERNEL); 224 if (! info) 225 return -ENOMEM; 226 err = snd_pcm_info(substream, info); 227 if (err >= 0) { 228 if (copy_to_user(_info, info, sizeof(*info))) 229 err = -EFAULT; 230 } 231 kfree(info); 232 return err; 233 } 234 235 static bool hw_support_mmap(struct snd_pcm_substream *substream) 236 { 237 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 238 return false; 239 /* architecture supports dma_mmap_coherent()? */ 240 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) 241 if (!substream->ops->mmap && 242 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 243 return false; 244 #endif 245 return true; 246 } 247 248 static int constrain_mask_params(struct snd_pcm_substream *substream, 249 struct snd_pcm_hw_params *params) 250 { 251 struct snd_pcm_hw_constraints *constrs = 252 &substream->runtime->hw_constraints; 253 struct snd_mask *m; 254 unsigned int k; 255 struct snd_mask old_mask; 256 int changed; 257 258 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 259 m = hw_param_mask(params, k); 260 if (snd_mask_empty(m)) 261 return -EINVAL; 262 263 /* This parameter is not requested to change by a caller. */ 264 if (!(params->rmask & (1 << k))) 265 continue; 266 267 if (trace_hw_mask_param_enabled()) 268 old_mask = *m; 269 270 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 271 if (changed < 0) 272 return changed; 273 if (changed == 0) 274 continue; 275 276 /* Set corresponding flag so that the caller gets it. */ 277 trace_hw_mask_param(substream, k, 0, &old_mask, m); 278 params->cmask |= 1 << k; 279 } 280 281 return 0; 282 } 283 284 static int constrain_interval_params(struct snd_pcm_substream *substream, 285 struct snd_pcm_hw_params *params) 286 { 287 struct snd_pcm_hw_constraints *constrs = 288 &substream->runtime->hw_constraints; 289 struct snd_interval *i; 290 unsigned int k; 291 struct snd_interval old_interval; 292 int changed; 293 294 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 295 i = hw_param_interval(params, k); 296 if (snd_interval_empty(i)) 297 return -EINVAL; 298 299 /* This parameter is not requested to change by a caller. */ 300 if (!(params->rmask & (1 << k))) 301 continue; 302 303 if (trace_hw_interval_param_enabled()) 304 old_interval = *i; 305 306 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 307 if (changed < 0) 308 return changed; 309 if (changed == 0) 310 continue; 311 312 /* Set corresponding flag so that the caller gets it. */ 313 trace_hw_interval_param(substream, k, 0, &old_interval, i); 314 params->cmask |= 1 << k; 315 } 316 317 return 0; 318 } 319 320 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 321 struct snd_pcm_hw_params *params) 322 { 323 struct snd_pcm_hw_constraints *constrs = 324 &substream->runtime->hw_constraints; 325 unsigned int k; 326 unsigned int *rstamps; 327 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 328 unsigned int stamp; 329 struct snd_pcm_hw_rule *r; 330 unsigned int d; 331 struct snd_mask old_mask; 332 struct snd_interval old_interval; 333 bool again; 334 int changed, err = 0; 335 336 /* 337 * Each application of rule has own sequence number. 338 * 339 * Each member of 'rstamps' array represents the sequence number of 340 * recent application of corresponding rule. 341 */ 342 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 343 if (!rstamps) 344 return -ENOMEM; 345 346 /* 347 * Each member of 'vstamps' array represents the sequence number of 348 * recent application of rule in which corresponding parameters were 349 * changed. 350 * 351 * In initial state, elements corresponding to parameters requested by 352 * a caller is 1. For unrequested parameters, corresponding members 353 * have 0 so that the parameters are never changed anymore. 354 */ 355 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 356 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 357 358 /* Due to the above design, actual sequence number starts at 2. */ 359 stamp = 2; 360 retry: 361 /* Apply all rules in order. */ 362 again = false; 363 for (k = 0; k < constrs->rules_num; k++) { 364 r = &constrs->rules[k]; 365 366 /* 367 * Check condition bits of this rule. When the rule has 368 * some condition bits, parameter without the bits is 369 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 370 * is an example of the condition bits. 371 */ 372 if (r->cond && !(r->cond & params->flags)) 373 continue; 374 375 /* 376 * The 'deps' array includes maximum three dependencies 377 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 378 * member of this array is a sentinel and should be 379 * negative value. 380 * 381 * This rule should be processed in this time when dependent 382 * parameters were changed at former applications of the other 383 * rules. 384 */ 385 for (d = 0; r->deps[d] >= 0; d++) { 386 if (vstamps[r->deps[d]] > rstamps[k]) 387 break; 388 } 389 if (r->deps[d] < 0) 390 continue; 391 392 if (trace_hw_mask_param_enabled()) { 393 if (hw_is_mask(r->var)) 394 old_mask = *hw_param_mask(params, r->var); 395 } 396 if (trace_hw_interval_param_enabled()) { 397 if (hw_is_interval(r->var)) 398 old_interval = *hw_param_interval(params, r->var); 399 } 400 401 changed = r->func(params, r); 402 if (changed < 0) { 403 err = changed; 404 goto out; 405 } 406 407 /* 408 * When the parameter is changed, notify it to the caller 409 * by corresponding returned bit, then preparing for next 410 * iteration. 411 */ 412 if (changed && r->var >= 0) { 413 if (hw_is_mask(r->var)) { 414 trace_hw_mask_param(substream, r->var, 415 k + 1, &old_mask, 416 hw_param_mask(params, r->var)); 417 } 418 if (hw_is_interval(r->var)) { 419 trace_hw_interval_param(substream, r->var, 420 k + 1, &old_interval, 421 hw_param_interval(params, r->var)); 422 } 423 424 params->cmask |= (1 << r->var); 425 vstamps[r->var] = stamp; 426 again = true; 427 } 428 429 rstamps[k] = stamp++; 430 } 431 432 /* Iterate to evaluate all rules till no parameters are changed. */ 433 if (again) 434 goto retry; 435 436 out: 437 kfree(rstamps); 438 return err; 439 } 440 441 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 442 struct snd_pcm_hw_params *params) 443 { 444 const struct snd_interval *i; 445 const struct snd_mask *m; 446 int err; 447 448 if (!params->msbits) { 449 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 450 if (snd_interval_single(i)) 451 params->msbits = snd_interval_value(i); 452 } 453 454 if (!params->rate_den) { 455 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 456 if (snd_interval_single(i)) { 457 params->rate_num = snd_interval_value(i); 458 params->rate_den = 1; 459 } 460 } 461 462 if (!params->fifo_size) { 463 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 464 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 465 if (snd_mask_single(m) && snd_interval_single(i)) { 466 err = substream->ops->ioctl(substream, 467 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 468 if (err < 0) 469 return err; 470 } 471 } 472 473 if (!params->info) { 474 params->info = substream->runtime->hw.info; 475 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 476 SNDRV_PCM_INFO_DRAIN_TRIGGER); 477 if (!hw_support_mmap(substream)) 478 params->info &= ~(SNDRV_PCM_INFO_MMAP | 479 SNDRV_PCM_INFO_MMAP_VALID); 480 } 481 482 return 0; 483 } 484 485 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 486 struct snd_pcm_hw_params *params) 487 { 488 int err; 489 490 params->info = 0; 491 params->fifo_size = 0; 492 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 493 params->msbits = 0; 494 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 495 params->rate_num = 0; 496 params->rate_den = 0; 497 } 498 499 err = constrain_mask_params(substream, params); 500 if (err < 0) 501 return err; 502 503 err = constrain_interval_params(substream, params); 504 if (err < 0) 505 return err; 506 507 err = constrain_params_by_rules(substream, params); 508 if (err < 0) 509 return err; 510 511 params->rmask = 0; 512 513 return 0; 514 } 515 EXPORT_SYMBOL(snd_pcm_hw_refine); 516 517 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 518 struct snd_pcm_hw_params __user * _params) 519 { 520 struct snd_pcm_hw_params *params; 521 int err; 522 523 params = memdup_user(_params, sizeof(*params)); 524 if (IS_ERR(params)) 525 return PTR_ERR(params); 526 527 err = snd_pcm_hw_refine(substream, params); 528 if (err < 0) 529 goto end; 530 531 err = fixup_unreferenced_params(substream, params); 532 if (err < 0) 533 goto end; 534 535 if (copy_to_user(_params, params, sizeof(*params))) 536 err = -EFAULT; 537 end: 538 kfree(params); 539 return err; 540 } 541 542 static int period_to_usecs(struct snd_pcm_runtime *runtime) 543 { 544 int usecs; 545 546 if (! runtime->rate) 547 return -1; /* invalid */ 548 549 /* take 75% of period time as the deadline */ 550 usecs = (750000 / runtime->rate) * runtime->period_size; 551 usecs += ((750000 % runtime->rate) * runtime->period_size) / 552 runtime->rate; 553 554 return usecs; 555 } 556 557 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 558 { 559 snd_pcm_stream_lock_irq(substream); 560 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 561 substream->runtime->status->state = state; 562 snd_pcm_stream_unlock_irq(substream); 563 } 564 565 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 566 int event) 567 { 568 #ifdef CONFIG_SND_PCM_TIMER 569 if (substream->timer) 570 snd_timer_notify(substream->timer, event, 571 &substream->runtime->trigger_tstamp); 572 #endif 573 } 574 575 /** 576 * snd_pcm_hw_param_choose - choose a configuration defined by @params 577 * @pcm: PCM instance 578 * @params: the hw_params instance 579 * 580 * Choose one configuration from configuration space defined by @params. 581 * The configuration chosen is that obtained fixing in this order: 582 * first access, first format, first subformat, min channels, 583 * min rate, min period time, max buffer size, min tick time 584 * 585 * Return: Zero if successful, or a negative error code on failure. 586 */ 587 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 588 struct snd_pcm_hw_params *params) 589 { 590 static const int vars[] = { 591 SNDRV_PCM_HW_PARAM_ACCESS, 592 SNDRV_PCM_HW_PARAM_FORMAT, 593 SNDRV_PCM_HW_PARAM_SUBFORMAT, 594 SNDRV_PCM_HW_PARAM_CHANNELS, 595 SNDRV_PCM_HW_PARAM_RATE, 596 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 597 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 598 SNDRV_PCM_HW_PARAM_TICK_TIME, 599 -1 600 }; 601 const int *v; 602 struct snd_mask old_mask; 603 struct snd_interval old_interval; 604 int changed; 605 606 for (v = vars; *v != -1; v++) { 607 /* Keep old parameter to trace. */ 608 if (trace_hw_mask_param_enabled()) { 609 if (hw_is_mask(*v)) 610 old_mask = *hw_param_mask(params, *v); 611 } 612 if (trace_hw_interval_param_enabled()) { 613 if (hw_is_interval(*v)) 614 old_interval = *hw_param_interval(params, *v); 615 } 616 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 617 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 618 else 619 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 620 if (changed < 0) 621 return changed; 622 if (changed == 0) 623 continue; 624 625 /* Trace the changed parameter. */ 626 if (hw_is_mask(*v)) { 627 trace_hw_mask_param(pcm, *v, 0, &old_mask, 628 hw_param_mask(params, *v)); 629 } 630 if (hw_is_interval(*v)) { 631 trace_hw_interval_param(pcm, *v, 0, &old_interval, 632 hw_param_interval(params, *v)); 633 } 634 } 635 636 return 0; 637 } 638 639 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 640 struct snd_pcm_hw_params *params) 641 { 642 struct snd_pcm_runtime *runtime; 643 int err, usecs; 644 unsigned int bits; 645 snd_pcm_uframes_t frames; 646 647 if (PCM_RUNTIME_CHECK(substream)) 648 return -ENXIO; 649 runtime = substream->runtime; 650 snd_pcm_stream_lock_irq(substream); 651 switch (runtime->status->state) { 652 case SNDRV_PCM_STATE_OPEN: 653 case SNDRV_PCM_STATE_SETUP: 654 case SNDRV_PCM_STATE_PREPARED: 655 break; 656 default: 657 snd_pcm_stream_unlock_irq(substream); 658 return -EBADFD; 659 } 660 snd_pcm_stream_unlock_irq(substream); 661 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 662 if (!substream->oss.oss) 663 #endif 664 if (atomic_read(&substream->mmap_count)) 665 return -EBADFD; 666 667 params->rmask = ~0U; 668 err = snd_pcm_hw_refine(substream, params); 669 if (err < 0) 670 goto _error; 671 672 err = snd_pcm_hw_params_choose(substream, params); 673 if (err < 0) 674 goto _error; 675 676 err = fixup_unreferenced_params(substream, params); 677 if (err < 0) 678 goto _error; 679 680 if (substream->ops->hw_params != NULL) { 681 err = substream->ops->hw_params(substream, params); 682 if (err < 0) 683 goto _error; 684 } 685 686 runtime->access = params_access(params); 687 runtime->format = params_format(params); 688 runtime->subformat = params_subformat(params); 689 runtime->channels = params_channels(params); 690 runtime->rate = params_rate(params); 691 runtime->period_size = params_period_size(params); 692 runtime->periods = params_periods(params); 693 runtime->buffer_size = params_buffer_size(params); 694 runtime->info = params->info; 695 runtime->rate_num = params->rate_num; 696 runtime->rate_den = params->rate_den; 697 runtime->no_period_wakeup = 698 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 699 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 700 701 bits = snd_pcm_format_physical_width(runtime->format); 702 runtime->sample_bits = bits; 703 bits *= runtime->channels; 704 runtime->frame_bits = bits; 705 frames = 1; 706 while (bits % 8 != 0) { 707 bits *= 2; 708 frames *= 2; 709 } 710 runtime->byte_align = bits / 8; 711 runtime->min_align = frames; 712 713 /* Default sw params */ 714 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 715 runtime->period_step = 1; 716 runtime->control->avail_min = runtime->period_size; 717 runtime->start_threshold = 1; 718 runtime->stop_threshold = runtime->buffer_size; 719 runtime->silence_threshold = 0; 720 runtime->silence_size = 0; 721 runtime->boundary = runtime->buffer_size; 722 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 723 runtime->boundary *= 2; 724 725 snd_pcm_timer_resolution_change(substream); 726 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 727 728 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 729 pm_qos_remove_request(&substream->latency_pm_qos_req); 730 if ((usecs = period_to_usecs(runtime)) >= 0) 731 pm_qos_add_request(&substream->latency_pm_qos_req, 732 PM_QOS_CPU_DMA_LATENCY, usecs); 733 return 0; 734 _error: 735 /* hardware might be unusable from this time, 736 so we force application to retry to set 737 the correct hardware parameter settings */ 738 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 739 if (substream->ops->hw_free != NULL) 740 substream->ops->hw_free(substream); 741 return err; 742 } 743 744 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 745 struct snd_pcm_hw_params __user * _params) 746 { 747 struct snd_pcm_hw_params *params; 748 int err; 749 750 params = memdup_user(_params, sizeof(*params)); 751 if (IS_ERR(params)) 752 return PTR_ERR(params); 753 754 err = snd_pcm_hw_params(substream, params); 755 if (err < 0) 756 goto end; 757 758 if (copy_to_user(_params, params, sizeof(*params))) 759 err = -EFAULT; 760 end: 761 kfree(params); 762 return err; 763 } 764 765 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 766 { 767 struct snd_pcm_runtime *runtime; 768 int result = 0; 769 770 if (PCM_RUNTIME_CHECK(substream)) 771 return -ENXIO; 772 runtime = substream->runtime; 773 snd_pcm_stream_lock_irq(substream); 774 switch (runtime->status->state) { 775 case SNDRV_PCM_STATE_SETUP: 776 case SNDRV_PCM_STATE_PREPARED: 777 break; 778 default: 779 snd_pcm_stream_unlock_irq(substream); 780 return -EBADFD; 781 } 782 snd_pcm_stream_unlock_irq(substream); 783 if (atomic_read(&substream->mmap_count)) 784 return -EBADFD; 785 if (substream->ops->hw_free) 786 result = substream->ops->hw_free(substream); 787 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 788 pm_qos_remove_request(&substream->latency_pm_qos_req); 789 return result; 790 } 791 792 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 793 struct snd_pcm_sw_params *params) 794 { 795 struct snd_pcm_runtime *runtime; 796 int err; 797 798 if (PCM_RUNTIME_CHECK(substream)) 799 return -ENXIO; 800 runtime = substream->runtime; 801 snd_pcm_stream_lock_irq(substream); 802 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 803 snd_pcm_stream_unlock_irq(substream); 804 return -EBADFD; 805 } 806 snd_pcm_stream_unlock_irq(substream); 807 808 if (params->tstamp_mode < 0 || 809 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 810 return -EINVAL; 811 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 812 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 813 return -EINVAL; 814 if (params->avail_min == 0) 815 return -EINVAL; 816 if (params->silence_size >= runtime->boundary) { 817 if (params->silence_threshold != 0) 818 return -EINVAL; 819 } else { 820 if (params->silence_size > params->silence_threshold) 821 return -EINVAL; 822 if (params->silence_threshold > runtime->buffer_size) 823 return -EINVAL; 824 } 825 err = 0; 826 snd_pcm_stream_lock_irq(substream); 827 runtime->tstamp_mode = params->tstamp_mode; 828 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 829 runtime->tstamp_type = params->tstamp_type; 830 runtime->period_step = params->period_step; 831 runtime->control->avail_min = params->avail_min; 832 runtime->start_threshold = params->start_threshold; 833 runtime->stop_threshold = params->stop_threshold; 834 runtime->silence_threshold = params->silence_threshold; 835 runtime->silence_size = params->silence_size; 836 params->boundary = runtime->boundary; 837 if (snd_pcm_running(substream)) { 838 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 839 runtime->silence_size > 0) 840 snd_pcm_playback_silence(substream, ULONG_MAX); 841 err = snd_pcm_update_state(substream, runtime); 842 } 843 snd_pcm_stream_unlock_irq(substream); 844 return err; 845 } 846 847 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 848 struct snd_pcm_sw_params __user * _params) 849 { 850 struct snd_pcm_sw_params params; 851 int err; 852 if (copy_from_user(¶ms, _params, sizeof(params))) 853 return -EFAULT; 854 err = snd_pcm_sw_params(substream, ¶ms); 855 if (copy_to_user(_params, ¶ms, sizeof(params))) 856 return -EFAULT; 857 return err; 858 } 859 860 static inline snd_pcm_uframes_t 861 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 862 { 863 snd_pcm_uframes_t delay; 864 865 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 866 delay = snd_pcm_playback_hw_avail(substream->runtime); 867 else 868 delay = snd_pcm_capture_avail(substream->runtime); 869 return delay + substream->runtime->delay; 870 } 871 872 int snd_pcm_status(struct snd_pcm_substream *substream, 873 struct snd_pcm_status *status) 874 { 875 struct snd_pcm_runtime *runtime = substream->runtime; 876 877 snd_pcm_stream_lock_irq(substream); 878 879 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 880 &runtime->audio_tstamp_config); 881 882 /* backwards compatible behavior */ 883 if (runtime->audio_tstamp_config.type_requested == 884 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 885 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 886 runtime->audio_tstamp_config.type_requested = 887 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 888 else 889 runtime->audio_tstamp_config.type_requested = 890 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 891 runtime->audio_tstamp_report.valid = 0; 892 } else 893 runtime->audio_tstamp_report.valid = 1; 894 895 status->state = runtime->status->state; 896 status->suspended_state = runtime->status->suspended_state; 897 if (status->state == SNDRV_PCM_STATE_OPEN) 898 goto _end; 899 status->trigger_tstamp = runtime->trigger_tstamp; 900 if (snd_pcm_running(substream)) { 901 snd_pcm_update_hw_ptr(substream); 902 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 903 status->tstamp = runtime->status->tstamp; 904 status->driver_tstamp = runtime->driver_tstamp; 905 status->audio_tstamp = 906 runtime->status->audio_tstamp; 907 if (runtime->audio_tstamp_report.valid == 1) 908 /* backwards compatibility, no report provided in COMPAT mode */ 909 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 910 &status->audio_tstamp_accuracy, 911 &runtime->audio_tstamp_report); 912 913 goto _tstamp_end; 914 } 915 } else { 916 /* get tstamp only in fallback mode and only if enabled */ 917 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 918 snd_pcm_gettime(runtime, &status->tstamp); 919 } 920 _tstamp_end: 921 status->appl_ptr = runtime->control->appl_ptr; 922 status->hw_ptr = runtime->status->hw_ptr; 923 status->avail = snd_pcm_avail(substream); 924 status->delay = snd_pcm_running(substream) ? 925 snd_pcm_calc_delay(substream) : 0; 926 status->avail_max = runtime->avail_max; 927 status->overrange = runtime->overrange; 928 runtime->avail_max = 0; 929 runtime->overrange = 0; 930 _end: 931 snd_pcm_stream_unlock_irq(substream); 932 return 0; 933 } 934 935 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 936 struct snd_pcm_status __user * _status, 937 bool ext) 938 { 939 struct snd_pcm_status status; 940 int res; 941 942 memset(&status, 0, sizeof(status)); 943 /* 944 * with extension, parameters are read/write, 945 * get audio_tstamp_data from user, 946 * ignore rest of status structure 947 */ 948 if (ext && get_user(status.audio_tstamp_data, 949 (u32 __user *)(&_status->audio_tstamp_data))) 950 return -EFAULT; 951 res = snd_pcm_status(substream, &status); 952 if (res < 0) 953 return res; 954 if (copy_to_user(_status, &status, sizeof(status))) 955 return -EFAULT; 956 return 0; 957 } 958 959 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 960 struct snd_pcm_channel_info * info) 961 { 962 struct snd_pcm_runtime *runtime; 963 unsigned int channel; 964 965 channel = info->channel; 966 runtime = substream->runtime; 967 snd_pcm_stream_lock_irq(substream); 968 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 969 snd_pcm_stream_unlock_irq(substream); 970 return -EBADFD; 971 } 972 snd_pcm_stream_unlock_irq(substream); 973 if (channel >= runtime->channels) 974 return -EINVAL; 975 memset(info, 0, sizeof(*info)); 976 info->channel = channel; 977 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 978 } 979 980 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 981 struct snd_pcm_channel_info __user * _info) 982 { 983 struct snd_pcm_channel_info info; 984 int res; 985 986 if (copy_from_user(&info, _info, sizeof(info))) 987 return -EFAULT; 988 res = snd_pcm_channel_info(substream, &info); 989 if (res < 0) 990 return res; 991 if (copy_to_user(_info, &info, sizeof(info))) 992 return -EFAULT; 993 return 0; 994 } 995 996 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 997 { 998 struct snd_pcm_runtime *runtime = substream->runtime; 999 if (runtime->trigger_master == NULL) 1000 return; 1001 if (runtime->trigger_master == substream) { 1002 if (!runtime->trigger_tstamp_latched) 1003 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1004 } else { 1005 snd_pcm_trigger_tstamp(runtime->trigger_master); 1006 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1007 } 1008 runtime->trigger_master = NULL; 1009 } 1010 1011 struct action_ops { 1012 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1013 int (*do_action)(struct snd_pcm_substream *substream, int state); 1014 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1015 void (*post_action)(struct snd_pcm_substream *substream, int state); 1016 }; 1017 1018 /* 1019 * this functions is core for handling of linked stream 1020 * Note: the stream state might be changed also on failure 1021 * Note2: call with calling stream lock + link lock 1022 */ 1023 static int snd_pcm_action_group(const struct action_ops *ops, 1024 struct snd_pcm_substream *substream, 1025 int state, int do_lock) 1026 { 1027 struct snd_pcm_substream *s = NULL; 1028 struct snd_pcm_substream *s1; 1029 int res = 0, depth = 1; 1030 1031 snd_pcm_group_for_each_entry(s, substream) { 1032 if (do_lock && s != substream) { 1033 if (s->pcm->nonatomic) 1034 mutex_lock_nested(&s->self_group.mutex, depth); 1035 else 1036 spin_lock_nested(&s->self_group.lock, depth); 1037 depth++; 1038 } 1039 res = ops->pre_action(s, state); 1040 if (res < 0) 1041 goto _unlock; 1042 } 1043 snd_pcm_group_for_each_entry(s, substream) { 1044 res = ops->do_action(s, state); 1045 if (res < 0) { 1046 if (ops->undo_action) { 1047 snd_pcm_group_for_each_entry(s1, substream) { 1048 if (s1 == s) /* failed stream */ 1049 break; 1050 ops->undo_action(s1, state); 1051 } 1052 } 1053 s = NULL; /* unlock all */ 1054 goto _unlock; 1055 } 1056 } 1057 snd_pcm_group_for_each_entry(s, substream) { 1058 ops->post_action(s, state); 1059 } 1060 _unlock: 1061 if (do_lock) { 1062 /* unlock streams */ 1063 snd_pcm_group_for_each_entry(s1, substream) { 1064 if (s1 != substream) { 1065 if (s1->pcm->nonatomic) 1066 mutex_unlock(&s1->self_group.mutex); 1067 else 1068 spin_unlock(&s1->self_group.lock); 1069 } 1070 if (s1 == s) /* end */ 1071 break; 1072 } 1073 } 1074 return res; 1075 } 1076 1077 /* 1078 * Note: call with stream lock 1079 */ 1080 static int snd_pcm_action_single(const struct action_ops *ops, 1081 struct snd_pcm_substream *substream, 1082 int state) 1083 { 1084 int res; 1085 1086 res = ops->pre_action(substream, state); 1087 if (res < 0) 1088 return res; 1089 res = ops->do_action(substream, state); 1090 if (res == 0) 1091 ops->post_action(substream, state); 1092 else if (ops->undo_action) 1093 ops->undo_action(substream, state); 1094 return res; 1095 } 1096 1097 /* 1098 * Note: call with stream lock 1099 */ 1100 static int snd_pcm_action(const struct action_ops *ops, 1101 struct snd_pcm_substream *substream, 1102 int state) 1103 { 1104 int res; 1105 1106 if (!snd_pcm_stream_linked(substream)) 1107 return snd_pcm_action_single(ops, substream, state); 1108 1109 if (substream->pcm->nonatomic) { 1110 if (!mutex_trylock(&substream->group->mutex)) { 1111 mutex_unlock(&substream->self_group.mutex); 1112 mutex_lock(&substream->group->mutex); 1113 mutex_lock(&substream->self_group.mutex); 1114 } 1115 res = snd_pcm_action_group(ops, substream, state, 1); 1116 mutex_unlock(&substream->group->mutex); 1117 } else { 1118 if (!spin_trylock(&substream->group->lock)) { 1119 spin_unlock(&substream->self_group.lock); 1120 spin_lock(&substream->group->lock); 1121 spin_lock(&substream->self_group.lock); 1122 } 1123 res = snd_pcm_action_group(ops, substream, state, 1); 1124 spin_unlock(&substream->group->lock); 1125 } 1126 return res; 1127 } 1128 1129 /* 1130 * Note: don't use any locks before 1131 */ 1132 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1133 struct snd_pcm_substream *substream, 1134 int state) 1135 { 1136 int res; 1137 1138 snd_pcm_stream_lock_irq(substream); 1139 res = snd_pcm_action(ops, substream, state); 1140 snd_pcm_stream_unlock_irq(substream); 1141 return res; 1142 } 1143 1144 /* 1145 */ 1146 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1147 struct snd_pcm_substream *substream, 1148 int state) 1149 { 1150 int res; 1151 1152 down_read(&snd_pcm_link_rwsem); 1153 if (snd_pcm_stream_linked(substream)) 1154 res = snd_pcm_action_group(ops, substream, state, 0); 1155 else 1156 res = snd_pcm_action_single(ops, substream, state); 1157 up_read(&snd_pcm_link_rwsem); 1158 return res; 1159 } 1160 1161 /* 1162 * start callbacks 1163 */ 1164 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1165 { 1166 struct snd_pcm_runtime *runtime = substream->runtime; 1167 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1168 return -EBADFD; 1169 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1170 !snd_pcm_playback_data(substream)) 1171 return -EPIPE; 1172 runtime->trigger_tstamp_latched = false; 1173 runtime->trigger_master = substream; 1174 return 0; 1175 } 1176 1177 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1178 { 1179 if (substream->runtime->trigger_master != substream) 1180 return 0; 1181 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1182 } 1183 1184 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1185 { 1186 if (substream->runtime->trigger_master == substream) 1187 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1188 } 1189 1190 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1191 { 1192 struct snd_pcm_runtime *runtime = substream->runtime; 1193 snd_pcm_trigger_tstamp(substream); 1194 runtime->hw_ptr_jiffies = jiffies; 1195 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1196 runtime->rate; 1197 runtime->status->state = state; 1198 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1199 runtime->silence_size > 0) 1200 snd_pcm_playback_silence(substream, ULONG_MAX); 1201 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1202 } 1203 1204 static const struct action_ops snd_pcm_action_start = { 1205 .pre_action = snd_pcm_pre_start, 1206 .do_action = snd_pcm_do_start, 1207 .undo_action = snd_pcm_undo_start, 1208 .post_action = snd_pcm_post_start 1209 }; 1210 1211 /** 1212 * snd_pcm_start - start all linked streams 1213 * @substream: the PCM substream instance 1214 * 1215 * Return: Zero if successful, or a negative error code. 1216 * The stream lock must be acquired before calling this function. 1217 */ 1218 int snd_pcm_start(struct snd_pcm_substream *substream) 1219 { 1220 return snd_pcm_action(&snd_pcm_action_start, substream, 1221 SNDRV_PCM_STATE_RUNNING); 1222 } 1223 1224 /* take the stream lock and start the streams */ 1225 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1226 { 1227 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1228 SNDRV_PCM_STATE_RUNNING); 1229 } 1230 1231 /* 1232 * stop callbacks 1233 */ 1234 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1235 { 1236 struct snd_pcm_runtime *runtime = substream->runtime; 1237 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1238 return -EBADFD; 1239 runtime->trigger_master = substream; 1240 return 0; 1241 } 1242 1243 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1244 { 1245 if (substream->runtime->trigger_master == substream && 1246 snd_pcm_running(substream)) 1247 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1248 return 0; /* unconditonally stop all substreams */ 1249 } 1250 1251 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1252 { 1253 struct snd_pcm_runtime *runtime = substream->runtime; 1254 if (runtime->status->state != state) { 1255 snd_pcm_trigger_tstamp(substream); 1256 runtime->status->state = state; 1257 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1258 } 1259 wake_up(&runtime->sleep); 1260 wake_up(&runtime->tsleep); 1261 } 1262 1263 static const struct action_ops snd_pcm_action_stop = { 1264 .pre_action = snd_pcm_pre_stop, 1265 .do_action = snd_pcm_do_stop, 1266 .post_action = snd_pcm_post_stop 1267 }; 1268 1269 /** 1270 * snd_pcm_stop - try to stop all running streams in the substream group 1271 * @substream: the PCM substream instance 1272 * @state: PCM state after stopping the stream 1273 * 1274 * The state of each stream is then changed to the given state unconditionally. 1275 * 1276 * Return: Zero if successful, or a negative error code. 1277 */ 1278 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1279 { 1280 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1281 } 1282 EXPORT_SYMBOL(snd_pcm_stop); 1283 1284 /** 1285 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1286 * @substream: the PCM substream 1287 * 1288 * After stopping, the state is changed to SETUP. 1289 * Unlike snd_pcm_stop(), this affects only the given stream. 1290 * 1291 * Return: Zero if succesful, or a negative error code. 1292 */ 1293 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1294 { 1295 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1296 SNDRV_PCM_STATE_SETUP); 1297 } 1298 1299 /** 1300 * snd_pcm_stop_xrun - stop the running streams as XRUN 1301 * @substream: the PCM substream instance 1302 * 1303 * This stops the given running substream (and all linked substreams) as XRUN. 1304 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1305 * 1306 * Return: Zero if successful, or a negative error code. 1307 */ 1308 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1309 { 1310 unsigned long flags; 1311 int ret = 0; 1312 1313 snd_pcm_stream_lock_irqsave(substream, flags); 1314 if (snd_pcm_running(substream)) 1315 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1316 snd_pcm_stream_unlock_irqrestore(substream, flags); 1317 return ret; 1318 } 1319 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1320 1321 /* 1322 * pause callbacks 1323 */ 1324 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1325 { 1326 struct snd_pcm_runtime *runtime = substream->runtime; 1327 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1328 return -ENOSYS; 1329 if (push) { 1330 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1331 return -EBADFD; 1332 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1333 return -EBADFD; 1334 runtime->trigger_master = substream; 1335 return 0; 1336 } 1337 1338 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1339 { 1340 if (substream->runtime->trigger_master != substream) 1341 return 0; 1342 /* some drivers might use hw_ptr to recover from the pause - 1343 update the hw_ptr now */ 1344 if (push) 1345 snd_pcm_update_hw_ptr(substream); 1346 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1347 * a delta between the current jiffies, this gives a large enough 1348 * delta, effectively to skip the check once. 1349 */ 1350 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1351 return substream->ops->trigger(substream, 1352 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1353 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1354 } 1355 1356 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1357 { 1358 if (substream->runtime->trigger_master == substream) 1359 substream->ops->trigger(substream, 1360 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1361 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1362 } 1363 1364 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1365 { 1366 struct snd_pcm_runtime *runtime = substream->runtime; 1367 snd_pcm_trigger_tstamp(substream); 1368 if (push) { 1369 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1370 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1371 wake_up(&runtime->sleep); 1372 wake_up(&runtime->tsleep); 1373 } else { 1374 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1375 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1376 } 1377 } 1378 1379 static const struct action_ops snd_pcm_action_pause = { 1380 .pre_action = snd_pcm_pre_pause, 1381 .do_action = snd_pcm_do_pause, 1382 .undo_action = snd_pcm_undo_pause, 1383 .post_action = snd_pcm_post_pause 1384 }; 1385 1386 /* 1387 * Push/release the pause for all linked streams. 1388 */ 1389 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1390 { 1391 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1392 } 1393 1394 #ifdef CONFIG_PM 1395 /* suspend */ 1396 1397 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1398 { 1399 struct snd_pcm_runtime *runtime = substream->runtime; 1400 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1401 return -EBUSY; 1402 runtime->trigger_master = substream; 1403 return 0; 1404 } 1405 1406 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1407 { 1408 struct snd_pcm_runtime *runtime = substream->runtime; 1409 if (runtime->trigger_master != substream) 1410 return 0; 1411 if (! snd_pcm_running(substream)) 1412 return 0; 1413 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1414 return 0; /* suspend unconditionally */ 1415 } 1416 1417 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1418 { 1419 struct snd_pcm_runtime *runtime = substream->runtime; 1420 snd_pcm_trigger_tstamp(substream); 1421 runtime->status->suspended_state = runtime->status->state; 1422 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1423 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1424 wake_up(&runtime->sleep); 1425 wake_up(&runtime->tsleep); 1426 } 1427 1428 static const struct action_ops snd_pcm_action_suspend = { 1429 .pre_action = snd_pcm_pre_suspend, 1430 .do_action = snd_pcm_do_suspend, 1431 .post_action = snd_pcm_post_suspend 1432 }; 1433 1434 /** 1435 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1436 * @substream: the PCM substream 1437 * 1438 * After this call, all streams are changed to SUSPENDED state. 1439 * 1440 * Return: Zero if successful (or @substream is %NULL), or a negative error 1441 * code. 1442 */ 1443 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1444 { 1445 int err; 1446 unsigned long flags; 1447 1448 if (! substream) 1449 return 0; 1450 1451 snd_pcm_stream_lock_irqsave(substream, flags); 1452 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1453 snd_pcm_stream_unlock_irqrestore(substream, flags); 1454 return err; 1455 } 1456 EXPORT_SYMBOL(snd_pcm_suspend); 1457 1458 /** 1459 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1460 * @pcm: the PCM instance 1461 * 1462 * After this call, all streams are changed to SUSPENDED state. 1463 * 1464 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1465 */ 1466 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1467 { 1468 struct snd_pcm_substream *substream; 1469 int stream, err = 0; 1470 1471 if (! pcm) 1472 return 0; 1473 1474 for (stream = 0; stream < 2; stream++) { 1475 for (substream = pcm->streams[stream].substream; 1476 substream; substream = substream->next) { 1477 /* FIXME: the open/close code should lock this as well */ 1478 if (substream->runtime == NULL) 1479 continue; 1480 err = snd_pcm_suspend(substream); 1481 if (err < 0 && err != -EBUSY) 1482 return err; 1483 } 1484 } 1485 return 0; 1486 } 1487 EXPORT_SYMBOL(snd_pcm_suspend_all); 1488 1489 /* resume */ 1490 1491 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1492 { 1493 struct snd_pcm_runtime *runtime = substream->runtime; 1494 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1495 return -ENOSYS; 1496 runtime->trigger_master = substream; 1497 return 0; 1498 } 1499 1500 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1501 { 1502 struct snd_pcm_runtime *runtime = substream->runtime; 1503 if (runtime->trigger_master != substream) 1504 return 0; 1505 /* DMA not running previously? */ 1506 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1507 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1508 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1509 return 0; 1510 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1511 } 1512 1513 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1514 { 1515 if (substream->runtime->trigger_master == substream && 1516 snd_pcm_running(substream)) 1517 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1518 } 1519 1520 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1521 { 1522 struct snd_pcm_runtime *runtime = substream->runtime; 1523 snd_pcm_trigger_tstamp(substream); 1524 runtime->status->state = runtime->status->suspended_state; 1525 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1526 } 1527 1528 static const struct action_ops snd_pcm_action_resume = { 1529 .pre_action = snd_pcm_pre_resume, 1530 .do_action = snd_pcm_do_resume, 1531 .undo_action = snd_pcm_undo_resume, 1532 .post_action = snd_pcm_post_resume 1533 }; 1534 1535 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1536 { 1537 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1538 } 1539 1540 #else 1541 1542 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1543 { 1544 return -ENOSYS; 1545 } 1546 1547 #endif /* CONFIG_PM */ 1548 1549 /* 1550 * xrun ioctl 1551 * 1552 * Change the RUNNING stream(s) to XRUN state. 1553 */ 1554 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1555 { 1556 struct snd_pcm_runtime *runtime = substream->runtime; 1557 int result; 1558 1559 snd_pcm_stream_lock_irq(substream); 1560 switch (runtime->status->state) { 1561 case SNDRV_PCM_STATE_XRUN: 1562 result = 0; /* already there */ 1563 break; 1564 case SNDRV_PCM_STATE_RUNNING: 1565 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1566 break; 1567 default: 1568 result = -EBADFD; 1569 } 1570 snd_pcm_stream_unlock_irq(substream); 1571 return result; 1572 } 1573 1574 /* 1575 * reset ioctl 1576 */ 1577 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1578 { 1579 struct snd_pcm_runtime *runtime = substream->runtime; 1580 switch (runtime->status->state) { 1581 case SNDRV_PCM_STATE_RUNNING: 1582 case SNDRV_PCM_STATE_PREPARED: 1583 case SNDRV_PCM_STATE_PAUSED: 1584 case SNDRV_PCM_STATE_SUSPENDED: 1585 return 0; 1586 default: 1587 return -EBADFD; 1588 } 1589 } 1590 1591 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1592 { 1593 struct snd_pcm_runtime *runtime = substream->runtime; 1594 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1595 if (err < 0) 1596 return err; 1597 runtime->hw_ptr_base = 0; 1598 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1599 runtime->status->hw_ptr % runtime->period_size; 1600 runtime->silence_start = runtime->status->hw_ptr; 1601 runtime->silence_filled = 0; 1602 return 0; 1603 } 1604 1605 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1606 { 1607 struct snd_pcm_runtime *runtime = substream->runtime; 1608 runtime->control->appl_ptr = runtime->status->hw_ptr; 1609 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1610 runtime->silence_size > 0) 1611 snd_pcm_playback_silence(substream, ULONG_MAX); 1612 } 1613 1614 static const struct action_ops snd_pcm_action_reset = { 1615 .pre_action = snd_pcm_pre_reset, 1616 .do_action = snd_pcm_do_reset, 1617 .post_action = snd_pcm_post_reset 1618 }; 1619 1620 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1621 { 1622 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1623 } 1624 1625 /* 1626 * prepare ioctl 1627 */ 1628 /* we use the second argument for updating f_flags */ 1629 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1630 int f_flags) 1631 { 1632 struct snd_pcm_runtime *runtime = substream->runtime; 1633 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1634 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1635 return -EBADFD; 1636 if (snd_pcm_running(substream)) 1637 return -EBUSY; 1638 substream->f_flags = f_flags; 1639 return 0; 1640 } 1641 1642 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1643 { 1644 int err; 1645 err = substream->ops->prepare(substream); 1646 if (err < 0) 1647 return err; 1648 return snd_pcm_do_reset(substream, 0); 1649 } 1650 1651 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1652 { 1653 struct snd_pcm_runtime *runtime = substream->runtime; 1654 runtime->control->appl_ptr = runtime->status->hw_ptr; 1655 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1656 } 1657 1658 static const struct action_ops snd_pcm_action_prepare = { 1659 .pre_action = snd_pcm_pre_prepare, 1660 .do_action = snd_pcm_do_prepare, 1661 .post_action = snd_pcm_post_prepare 1662 }; 1663 1664 /** 1665 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1666 * @substream: the PCM substream instance 1667 * @file: file to refer f_flags 1668 * 1669 * Return: Zero if successful, or a negative error code. 1670 */ 1671 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1672 struct file *file) 1673 { 1674 int f_flags; 1675 1676 if (file) 1677 f_flags = file->f_flags; 1678 else 1679 f_flags = substream->f_flags; 1680 1681 snd_pcm_stream_lock_irq(substream); 1682 switch (substream->runtime->status->state) { 1683 case SNDRV_PCM_STATE_PAUSED: 1684 snd_pcm_pause(substream, 0); 1685 /* fallthru */ 1686 case SNDRV_PCM_STATE_SUSPENDED: 1687 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1688 break; 1689 } 1690 snd_pcm_stream_unlock_irq(substream); 1691 1692 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1693 substream, f_flags); 1694 } 1695 1696 /* 1697 * drain ioctl 1698 */ 1699 1700 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1701 { 1702 struct snd_pcm_runtime *runtime = substream->runtime; 1703 switch (runtime->status->state) { 1704 case SNDRV_PCM_STATE_OPEN: 1705 case SNDRV_PCM_STATE_DISCONNECTED: 1706 case SNDRV_PCM_STATE_SUSPENDED: 1707 return -EBADFD; 1708 } 1709 runtime->trigger_master = substream; 1710 return 0; 1711 } 1712 1713 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1714 { 1715 struct snd_pcm_runtime *runtime = substream->runtime; 1716 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1717 switch (runtime->status->state) { 1718 case SNDRV_PCM_STATE_PREPARED: 1719 /* start playback stream if possible */ 1720 if (! snd_pcm_playback_empty(substream)) { 1721 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1722 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1723 } else { 1724 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1725 } 1726 break; 1727 case SNDRV_PCM_STATE_RUNNING: 1728 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1729 break; 1730 case SNDRV_PCM_STATE_XRUN: 1731 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1732 break; 1733 default: 1734 break; 1735 } 1736 } else { 1737 /* stop running stream */ 1738 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1739 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1740 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1741 snd_pcm_do_stop(substream, new_state); 1742 snd_pcm_post_stop(substream, new_state); 1743 } 1744 } 1745 1746 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1747 runtime->trigger_master == substream && 1748 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1749 return substream->ops->trigger(substream, 1750 SNDRV_PCM_TRIGGER_DRAIN); 1751 1752 return 0; 1753 } 1754 1755 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1756 { 1757 } 1758 1759 static const struct action_ops snd_pcm_action_drain_init = { 1760 .pre_action = snd_pcm_pre_drain_init, 1761 .do_action = snd_pcm_do_drain_init, 1762 .post_action = snd_pcm_post_drain_init 1763 }; 1764 1765 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1766 1767 /* 1768 * Drain the stream(s). 1769 * When the substream is linked, sync until the draining of all playback streams 1770 * is finished. 1771 * After this call, all streams are supposed to be either SETUP or DRAINING 1772 * (capture only) state. 1773 */ 1774 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1775 struct file *file) 1776 { 1777 struct snd_card *card; 1778 struct snd_pcm_runtime *runtime; 1779 struct snd_pcm_substream *s; 1780 wait_queue_entry_t wait; 1781 int result = 0; 1782 int nonblock = 0; 1783 1784 card = substream->pcm->card; 1785 runtime = substream->runtime; 1786 1787 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1788 return -EBADFD; 1789 1790 if (file) { 1791 if (file->f_flags & O_NONBLOCK) 1792 nonblock = 1; 1793 } else if (substream->f_flags & O_NONBLOCK) 1794 nonblock = 1; 1795 1796 down_read(&snd_pcm_link_rwsem); 1797 snd_pcm_stream_lock_irq(substream); 1798 /* resume pause */ 1799 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1800 snd_pcm_pause(substream, 0); 1801 1802 /* pre-start/stop - all running streams are changed to DRAINING state */ 1803 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1804 if (result < 0) 1805 goto unlock; 1806 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1807 if (nonblock) { 1808 result = -EAGAIN; 1809 goto unlock; 1810 } 1811 1812 for (;;) { 1813 long tout; 1814 struct snd_pcm_runtime *to_check; 1815 if (signal_pending(current)) { 1816 result = -ERESTARTSYS; 1817 break; 1818 } 1819 /* find a substream to drain */ 1820 to_check = NULL; 1821 snd_pcm_group_for_each_entry(s, substream) { 1822 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1823 continue; 1824 runtime = s->runtime; 1825 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1826 to_check = runtime; 1827 break; 1828 } 1829 } 1830 if (!to_check) 1831 break; /* all drained */ 1832 init_waitqueue_entry(&wait, current); 1833 add_wait_queue(&to_check->sleep, &wait); 1834 snd_pcm_stream_unlock_irq(substream); 1835 up_read(&snd_pcm_link_rwsem); 1836 if (runtime->no_period_wakeup) 1837 tout = MAX_SCHEDULE_TIMEOUT; 1838 else { 1839 tout = 10; 1840 if (runtime->rate) { 1841 long t = runtime->period_size * 2 / runtime->rate; 1842 tout = max(t, tout); 1843 } 1844 tout = msecs_to_jiffies(tout * 1000); 1845 } 1846 tout = schedule_timeout_interruptible(tout); 1847 down_read(&snd_pcm_link_rwsem); 1848 snd_pcm_stream_lock_irq(substream); 1849 remove_wait_queue(&to_check->sleep, &wait); 1850 if (card->shutdown) { 1851 result = -ENODEV; 1852 break; 1853 } 1854 if (tout == 0) { 1855 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1856 result = -ESTRPIPE; 1857 else { 1858 dev_dbg(substream->pcm->card->dev, 1859 "playback drain error (DMA or IRQ trouble?)\n"); 1860 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1861 result = -EIO; 1862 } 1863 break; 1864 } 1865 } 1866 1867 unlock: 1868 snd_pcm_stream_unlock_irq(substream); 1869 up_read(&snd_pcm_link_rwsem); 1870 1871 return result; 1872 } 1873 1874 /* 1875 * drop ioctl 1876 * 1877 * Immediately put all linked substreams into SETUP state. 1878 */ 1879 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1880 { 1881 struct snd_pcm_runtime *runtime; 1882 int result = 0; 1883 1884 if (PCM_RUNTIME_CHECK(substream)) 1885 return -ENXIO; 1886 runtime = substream->runtime; 1887 1888 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1889 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1890 return -EBADFD; 1891 1892 snd_pcm_stream_lock_irq(substream); 1893 /* resume pause */ 1894 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1895 snd_pcm_pause(substream, 0); 1896 1897 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1898 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1899 snd_pcm_stream_unlock_irq(substream); 1900 1901 return result; 1902 } 1903 1904 1905 static bool is_pcm_file(struct file *file) 1906 { 1907 struct inode *inode = file_inode(file); 1908 unsigned int minor; 1909 1910 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1911 return false; 1912 minor = iminor(inode); 1913 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1914 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1915 } 1916 1917 /* 1918 * PCM link handling 1919 */ 1920 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1921 { 1922 int res = 0; 1923 struct snd_pcm_file *pcm_file; 1924 struct snd_pcm_substream *substream1; 1925 struct snd_pcm_group *group; 1926 struct fd f = fdget(fd); 1927 1928 if (!f.file) 1929 return -EBADFD; 1930 if (!is_pcm_file(f.file)) { 1931 res = -EBADFD; 1932 goto _badf; 1933 } 1934 pcm_file = f.file->private_data; 1935 substream1 = pcm_file->substream; 1936 group = kmalloc(sizeof(*group), GFP_KERNEL); 1937 if (!group) { 1938 res = -ENOMEM; 1939 goto _nolock; 1940 } 1941 down_write_nonblock(&snd_pcm_link_rwsem); 1942 write_lock_irq(&snd_pcm_link_rwlock); 1943 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1944 substream->runtime->status->state != substream1->runtime->status->state || 1945 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1946 res = -EBADFD; 1947 goto _end; 1948 } 1949 if (snd_pcm_stream_linked(substream1)) { 1950 res = -EALREADY; 1951 goto _end; 1952 } 1953 if (!snd_pcm_stream_linked(substream)) { 1954 substream->group = group; 1955 group = NULL; 1956 spin_lock_init(&substream->group->lock); 1957 mutex_init(&substream->group->mutex); 1958 INIT_LIST_HEAD(&substream->group->substreams); 1959 list_add_tail(&substream->link_list, &substream->group->substreams); 1960 substream->group->count = 1; 1961 } 1962 list_add_tail(&substream1->link_list, &substream->group->substreams); 1963 substream->group->count++; 1964 substream1->group = substream->group; 1965 _end: 1966 write_unlock_irq(&snd_pcm_link_rwlock); 1967 up_write(&snd_pcm_link_rwsem); 1968 _nolock: 1969 snd_card_unref(substream1->pcm->card); 1970 kfree(group); 1971 _badf: 1972 fdput(f); 1973 return res; 1974 } 1975 1976 static void relink_to_local(struct snd_pcm_substream *substream) 1977 { 1978 substream->group = &substream->self_group; 1979 INIT_LIST_HEAD(&substream->self_group.substreams); 1980 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1981 } 1982 1983 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1984 { 1985 struct snd_pcm_substream *s; 1986 int res = 0; 1987 1988 down_write_nonblock(&snd_pcm_link_rwsem); 1989 write_lock_irq(&snd_pcm_link_rwlock); 1990 if (!snd_pcm_stream_linked(substream)) { 1991 res = -EALREADY; 1992 goto _end; 1993 } 1994 list_del(&substream->link_list); 1995 substream->group->count--; 1996 if (substream->group->count == 1) { /* detach the last stream, too */ 1997 snd_pcm_group_for_each_entry(s, substream) { 1998 relink_to_local(s); 1999 break; 2000 } 2001 kfree(substream->group); 2002 } 2003 relink_to_local(substream); 2004 _end: 2005 write_unlock_irq(&snd_pcm_link_rwlock); 2006 up_write(&snd_pcm_link_rwsem); 2007 return res; 2008 } 2009 2010 /* 2011 * hw configurator 2012 */ 2013 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2014 struct snd_pcm_hw_rule *rule) 2015 { 2016 struct snd_interval t; 2017 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2018 hw_param_interval_c(params, rule->deps[1]), &t); 2019 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2020 } 2021 2022 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2023 struct snd_pcm_hw_rule *rule) 2024 { 2025 struct snd_interval t; 2026 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2027 hw_param_interval_c(params, rule->deps[1]), &t); 2028 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2029 } 2030 2031 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2032 struct snd_pcm_hw_rule *rule) 2033 { 2034 struct snd_interval t; 2035 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2036 hw_param_interval_c(params, rule->deps[1]), 2037 (unsigned long) rule->private, &t); 2038 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2039 } 2040 2041 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2042 struct snd_pcm_hw_rule *rule) 2043 { 2044 struct snd_interval t; 2045 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2046 (unsigned long) rule->private, 2047 hw_param_interval_c(params, rule->deps[1]), &t); 2048 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2049 } 2050 2051 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2052 struct snd_pcm_hw_rule *rule) 2053 { 2054 unsigned int k; 2055 const struct snd_interval *i = 2056 hw_param_interval_c(params, rule->deps[0]); 2057 struct snd_mask m; 2058 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2059 snd_mask_any(&m); 2060 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2061 int bits; 2062 if (! snd_mask_test(mask, k)) 2063 continue; 2064 bits = snd_pcm_format_physical_width(k); 2065 if (bits <= 0) 2066 continue; /* ignore invalid formats */ 2067 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2068 snd_mask_reset(&m, k); 2069 } 2070 return snd_mask_refine(mask, &m); 2071 } 2072 2073 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2074 struct snd_pcm_hw_rule *rule) 2075 { 2076 struct snd_interval t; 2077 unsigned int k; 2078 t.min = UINT_MAX; 2079 t.max = 0; 2080 t.openmin = 0; 2081 t.openmax = 0; 2082 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2083 int bits; 2084 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2085 continue; 2086 bits = snd_pcm_format_physical_width(k); 2087 if (bits <= 0) 2088 continue; /* ignore invalid formats */ 2089 if (t.min > (unsigned)bits) 2090 t.min = bits; 2091 if (t.max < (unsigned)bits) 2092 t.max = bits; 2093 } 2094 t.integer = 1; 2095 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2096 } 2097 2098 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2099 #error "Change this table" 2100 #endif 2101 2102 static const unsigned int rates[] = { 2103 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2104 48000, 64000, 88200, 96000, 176400, 192000 2105 }; 2106 2107 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2108 .count = ARRAY_SIZE(rates), 2109 .list = rates, 2110 }; 2111 2112 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2113 struct snd_pcm_hw_rule *rule) 2114 { 2115 struct snd_pcm_hardware *hw = rule->private; 2116 return snd_interval_list(hw_param_interval(params, rule->var), 2117 snd_pcm_known_rates.count, 2118 snd_pcm_known_rates.list, hw->rates); 2119 } 2120 2121 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2122 struct snd_pcm_hw_rule *rule) 2123 { 2124 struct snd_interval t; 2125 struct snd_pcm_substream *substream = rule->private; 2126 t.min = 0; 2127 t.max = substream->buffer_bytes_max; 2128 t.openmin = 0; 2129 t.openmax = 0; 2130 t.integer = 1; 2131 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2132 } 2133 2134 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2135 { 2136 struct snd_pcm_runtime *runtime = substream->runtime; 2137 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2138 int k, err; 2139 2140 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2141 snd_mask_any(constrs_mask(constrs, k)); 2142 } 2143 2144 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2145 snd_interval_any(constrs_interval(constrs, k)); 2146 } 2147 2148 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2149 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2150 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2151 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2152 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2153 2154 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2155 snd_pcm_hw_rule_format, NULL, 2156 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2157 if (err < 0) 2158 return err; 2159 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2160 snd_pcm_hw_rule_sample_bits, NULL, 2161 SNDRV_PCM_HW_PARAM_FORMAT, 2162 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2163 if (err < 0) 2164 return err; 2165 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2166 snd_pcm_hw_rule_div, NULL, 2167 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2168 if (err < 0) 2169 return err; 2170 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2171 snd_pcm_hw_rule_mul, NULL, 2172 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2173 if (err < 0) 2174 return err; 2175 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2176 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2177 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2178 if (err < 0) 2179 return err; 2180 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2181 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2182 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2183 if (err < 0) 2184 return err; 2185 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2186 snd_pcm_hw_rule_div, NULL, 2187 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2188 if (err < 0) 2189 return err; 2190 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2191 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2192 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2193 if (err < 0) 2194 return err; 2195 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2196 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2197 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2198 if (err < 0) 2199 return err; 2200 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2201 snd_pcm_hw_rule_div, NULL, 2202 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2203 if (err < 0) 2204 return err; 2205 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2206 snd_pcm_hw_rule_div, NULL, 2207 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2208 if (err < 0) 2209 return err; 2210 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2211 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2212 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2213 if (err < 0) 2214 return err; 2215 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2216 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2217 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2218 if (err < 0) 2219 return err; 2220 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2221 snd_pcm_hw_rule_mul, NULL, 2222 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2223 if (err < 0) 2224 return err; 2225 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2226 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2227 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2228 if (err < 0) 2229 return err; 2230 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2231 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2232 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2233 if (err < 0) 2234 return err; 2235 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2236 snd_pcm_hw_rule_muldivk, (void*) 8, 2237 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2238 if (err < 0) 2239 return err; 2240 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2241 snd_pcm_hw_rule_muldivk, (void*) 8, 2242 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2243 if (err < 0) 2244 return err; 2245 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2246 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2247 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2248 if (err < 0) 2249 return err; 2250 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2251 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2252 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2253 if (err < 0) 2254 return err; 2255 return 0; 2256 } 2257 2258 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2259 { 2260 struct snd_pcm_runtime *runtime = substream->runtime; 2261 struct snd_pcm_hardware *hw = &runtime->hw; 2262 int err; 2263 unsigned int mask = 0; 2264 2265 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2266 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2267 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2268 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2269 if (hw_support_mmap(substream)) { 2270 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2271 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2272 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2273 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2274 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2275 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2276 } 2277 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2278 if (err < 0) 2279 return err; 2280 2281 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2282 if (err < 0) 2283 return err; 2284 2285 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2286 if (err < 0) 2287 return err; 2288 2289 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2290 hw->channels_min, hw->channels_max); 2291 if (err < 0) 2292 return err; 2293 2294 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2295 hw->rate_min, hw->rate_max); 2296 if (err < 0) 2297 return err; 2298 2299 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2300 hw->period_bytes_min, hw->period_bytes_max); 2301 if (err < 0) 2302 return err; 2303 2304 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2305 hw->periods_min, hw->periods_max); 2306 if (err < 0) 2307 return err; 2308 2309 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2310 hw->period_bytes_min, hw->buffer_bytes_max); 2311 if (err < 0) 2312 return err; 2313 2314 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2315 snd_pcm_hw_rule_buffer_bytes_max, substream, 2316 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2317 if (err < 0) 2318 return err; 2319 2320 /* FIXME: remove */ 2321 if (runtime->dma_bytes) { 2322 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2323 if (err < 0) 2324 return err; 2325 } 2326 2327 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2328 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2329 snd_pcm_hw_rule_rate, hw, 2330 SNDRV_PCM_HW_PARAM_RATE, -1); 2331 if (err < 0) 2332 return err; 2333 } 2334 2335 /* FIXME: this belong to lowlevel */ 2336 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2337 2338 return 0; 2339 } 2340 2341 static void pcm_release_private(struct snd_pcm_substream *substream) 2342 { 2343 snd_pcm_unlink(substream); 2344 } 2345 2346 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2347 { 2348 substream->ref_count--; 2349 if (substream->ref_count > 0) 2350 return; 2351 2352 snd_pcm_drop(substream); 2353 if (substream->hw_opened) { 2354 if (substream->ops->hw_free && 2355 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2356 substream->ops->hw_free(substream); 2357 substream->ops->close(substream); 2358 substream->hw_opened = 0; 2359 } 2360 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2361 pm_qos_remove_request(&substream->latency_pm_qos_req); 2362 if (substream->pcm_release) { 2363 substream->pcm_release(substream); 2364 substream->pcm_release = NULL; 2365 } 2366 snd_pcm_detach_substream(substream); 2367 } 2368 EXPORT_SYMBOL(snd_pcm_release_substream); 2369 2370 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2371 struct file *file, 2372 struct snd_pcm_substream **rsubstream) 2373 { 2374 struct snd_pcm_substream *substream; 2375 int err; 2376 2377 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2378 if (err < 0) 2379 return err; 2380 if (substream->ref_count > 1) { 2381 *rsubstream = substream; 2382 return 0; 2383 } 2384 2385 err = snd_pcm_hw_constraints_init(substream); 2386 if (err < 0) { 2387 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2388 goto error; 2389 } 2390 2391 if ((err = substream->ops->open(substream)) < 0) 2392 goto error; 2393 2394 substream->hw_opened = 1; 2395 2396 err = snd_pcm_hw_constraints_complete(substream); 2397 if (err < 0) { 2398 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2399 goto error; 2400 } 2401 2402 *rsubstream = substream; 2403 return 0; 2404 2405 error: 2406 snd_pcm_release_substream(substream); 2407 return err; 2408 } 2409 EXPORT_SYMBOL(snd_pcm_open_substream); 2410 2411 static int snd_pcm_open_file(struct file *file, 2412 struct snd_pcm *pcm, 2413 int stream) 2414 { 2415 struct snd_pcm_file *pcm_file; 2416 struct snd_pcm_substream *substream; 2417 int err; 2418 2419 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2420 if (err < 0) 2421 return err; 2422 2423 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2424 if (pcm_file == NULL) { 2425 snd_pcm_release_substream(substream); 2426 return -ENOMEM; 2427 } 2428 pcm_file->substream = substream; 2429 if (substream->ref_count == 1) { 2430 substream->file = pcm_file; 2431 substream->pcm_release = pcm_release_private; 2432 } 2433 file->private_data = pcm_file; 2434 2435 return 0; 2436 } 2437 2438 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2439 { 2440 struct snd_pcm *pcm; 2441 int err = nonseekable_open(inode, file); 2442 if (err < 0) 2443 return err; 2444 pcm = snd_lookup_minor_data(iminor(inode), 2445 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2446 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2447 if (pcm) 2448 snd_card_unref(pcm->card); 2449 return err; 2450 } 2451 2452 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2453 { 2454 struct snd_pcm *pcm; 2455 int err = nonseekable_open(inode, file); 2456 if (err < 0) 2457 return err; 2458 pcm = snd_lookup_minor_data(iminor(inode), 2459 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2460 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2461 if (pcm) 2462 snd_card_unref(pcm->card); 2463 return err; 2464 } 2465 2466 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2467 { 2468 int err; 2469 wait_queue_entry_t wait; 2470 2471 if (pcm == NULL) { 2472 err = -ENODEV; 2473 goto __error1; 2474 } 2475 err = snd_card_file_add(pcm->card, file); 2476 if (err < 0) 2477 goto __error1; 2478 if (!try_module_get(pcm->card->module)) { 2479 err = -EFAULT; 2480 goto __error2; 2481 } 2482 init_waitqueue_entry(&wait, current); 2483 add_wait_queue(&pcm->open_wait, &wait); 2484 mutex_lock(&pcm->open_mutex); 2485 while (1) { 2486 err = snd_pcm_open_file(file, pcm, stream); 2487 if (err >= 0) 2488 break; 2489 if (err == -EAGAIN) { 2490 if (file->f_flags & O_NONBLOCK) { 2491 err = -EBUSY; 2492 break; 2493 } 2494 } else 2495 break; 2496 set_current_state(TASK_INTERRUPTIBLE); 2497 mutex_unlock(&pcm->open_mutex); 2498 schedule(); 2499 mutex_lock(&pcm->open_mutex); 2500 if (pcm->card->shutdown) { 2501 err = -ENODEV; 2502 break; 2503 } 2504 if (signal_pending(current)) { 2505 err = -ERESTARTSYS; 2506 break; 2507 } 2508 } 2509 remove_wait_queue(&pcm->open_wait, &wait); 2510 mutex_unlock(&pcm->open_mutex); 2511 if (err < 0) 2512 goto __error; 2513 return err; 2514 2515 __error: 2516 module_put(pcm->card->module); 2517 __error2: 2518 snd_card_file_remove(pcm->card, file); 2519 __error1: 2520 return err; 2521 } 2522 2523 static int snd_pcm_release(struct inode *inode, struct file *file) 2524 { 2525 struct snd_pcm *pcm; 2526 struct snd_pcm_substream *substream; 2527 struct snd_pcm_file *pcm_file; 2528 2529 pcm_file = file->private_data; 2530 substream = pcm_file->substream; 2531 if (snd_BUG_ON(!substream)) 2532 return -ENXIO; 2533 pcm = substream->pcm; 2534 mutex_lock(&pcm->open_mutex); 2535 snd_pcm_release_substream(substream); 2536 kfree(pcm_file); 2537 mutex_unlock(&pcm->open_mutex); 2538 wake_up(&pcm->open_wait); 2539 module_put(pcm->card->module); 2540 snd_card_file_remove(pcm->card, file); 2541 return 0; 2542 } 2543 2544 /* check and update PCM state; return 0 or a negative error 2545 * call this inside PCM lock 2546 */ 2547 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2548 { 2549 switch (substream->runtime->status->state) { 2550 case SNDRV_PCM_STATE_DRAINING: 2551 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2552 return -EBADFD; 2553 /* Fall through */ 2554 case SNDRV_PCM_STATE_RUNNING: 2555 return snd_pcm_update_hw_ptr(substream); 2556 case SNDRV_PCM_STATE_PREPARED: 2557 case SNDRV_PCM_STATE_PAUSED: 2558 return 0; 2559 case SNDRV_PCM_STATE_SUSPENDED: 2560 return -ESTRPIPE; 2561 case SNDRV_PCM_STATE_XRUN: 2562 return -EPIPE; 2563 default: 2564 return -EBADFD; 2565 } 2566 } 2567 2568 /* increase the appl_ptr; returns the processed frames or a negative error */ 2569 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2570 snd_pcm_uframes_t frames, 2571 snd_pcm_sframes_t avail) 2572 { 2573 struct snd_pcm_runtime *runtime = substream->runtime; 2574 snd_pcm_sframes_t appl_ptr; 2575 int ret; 2576 2577 if (avail <= 0) 2578 return 0; 2579 if (frames > (snd_pcm_uframes_t)avail) 2580 frames = avail; 2581 appl_ptr = runtime->control->appl_ptr + frames; 2582 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2583 appl_ptr -= runtime->boundary; 2584 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2585 return ret < 0 ? ret : frames; 2586 } 2587 2588 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2589 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2590 snd_pcm_uframes_t frames, 2591 snd_pcm_sframes_t avail) 2592 { 2593 struct snd_pcm_runtime *runtime = substream->runtime; 2594 snd_pcm_sframes_t appl_ptr; 2595 int ret; 2596 2597 if (avail <= 0) 2598 return 0; 2599 if (frames > (snd_pcm_uframes_t)avail) 2600 frames = avail; 2601 appl_ptr = runtime->control->appl_ptr - frames; 2602 if (appl_ptr < 0) 2603 appl_ptr += runtime->boundary; 2604 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2605 /* NOTE: we return zero for errors because PulseAudio gets depressed 2606 * upon receiving an error from rewind ioctl and stops processing 2607 * any longer. Returning zero means that no rewind is done, so 2608 * it's not absolutely wrong to answer like that. 2609 */ 2610 return ret < 0 ? 0 : frames; 2611 } 2612 2613 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2614 snd_pcm_uframes_t frames) 2615 { 2616 snd_pcm_sframes_t ret; 2617 2618 if (frames == 0) 2619 return 0; 2620 2621 snd_pcm_stream_lock_irq(substream); 2622 ret = do_pcm_hwsync(substream); 2623 if (!ret) 2624 ret = rewind_appl_ptr(substream, frames, 2625 snd_pcm_hw_avail(substream)); 2626 snd_pcm_stream_unlock_irq(substream); 2627 return ret; 2628 } 2629 2630 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2631 snd_pcm_uframes_t frames) 2632 { 2633 snd_pcm_sframes_t ret; 2634 2635 if (frames == 0) 2636 return 0; 2637 2638 snd_pcm_stream_lock_irq(substream); 2639 ret = do_pcm_hwsync(substream); 2640 if (!ret) 2641 ret = forward_appl_ptr(substream, frames, 2642 snd_pcm_avail(substream)); 2643 snd_pcm_stream_unlock_irq(substream); 2644 return ret; 2645 } 2646 2647 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2648 { 2649 int err; 2650 2651 snd_pcm_stream_lock_irq(substream); 2652 err = do_pcm_hwsync(substream); 2653 snd_pcm_stream_unlock_irq(substream); 2654 return err; 2655 } 2656 2657 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2658 snd_pcm_sframes_t *delay) 2659 { 2660 int err; 2661 snd_pcm_sframes_t n = 0; 2662 2663 snd_pcm_stream_lock_irq(substream); 2664 err = do_pcm_hwsync(substream); 2665 if (!err) 2666 n = snd_pcm_calc_delay(substream); 2667 snd_pcm_stream_unlock_irq(substream); 2668 if (!err) 2669 *delay = n; 2670 return err; 2671 } 2672 2673 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2674 struct snd_pcm_sync_ptr __user *_sync_ptr) 2675 { 2676 struct snd_pcm_runtime *runtime = substream->runtime; 2677 struct snd_pcm_sync_ptr sync_ptr; 2678 volatile struct snd_pcm_mmap_status *status; 2679 volatile struct snd_pcm_mmap_control *control; 2680 int err; 2681 2682 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2683 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2684 return -EFAULT; 2685 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2686 return -EFAULT; 2687 status = runtime->status; 2688 control = runtime->control; 2689 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2690 err = snd_pcm_hwsync(substream); 2691 if (err < 0) 2692 return err; 2693 } 2694 snd_pcm_stream_lock_irq(substream); 2695 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2696 err = pcm_lib_apply_appl_ptr(substream, 2697 sync_ptr.c.control.appl_ptr); 2698 if (err < 0) { 2699 snd_pcm_stream_unlock_irq(substream); 2700 return err; 2701 } 2702 } else { 2703 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2704 } 2705 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2706 control->avail_min = sync_ptr.c.control.avail_min; 2707 else 2708 sync_ptr.c.control.avail_min = control->avail_min; 2709 sync_ptr.s.status.state = status->state; 2710 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2711 sync_ptr.s.status.tstamp = status->tstamp; 2712 sync_ptr.s.status.suspended_state = status->suspended_state; 2713 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2714 snd_pcm_stream_unlock_irq(substream); 2715 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2716 return -EFAULT; 2717 return 0; 2718 } 2719 2720 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2721 { 2722 struct snd_pcm_runtime *runtime = substream->runtime; 2723 int arg; 2724 2725 if (get_user(arg, _arg)) 2726 return -EFAULT; 2727 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2728 return -EINVAL; 2729 runtime->tstamp_type = arg; 2730 return 0; 2731 } 2732 2733 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2734 struct snd_xferi __user *_xferi) 2735 { 2736 struct snd_xferi xferi; 2737 struct snd_pcm_runtime *runtime = substream->runtime; 2738 snd_pcm_sframes_t result; 2739 2740 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2741 return -EBADFD; 2742 if (put_user(0, &_xferi->result)) 2743 return -EFAULT; 2744 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2745 return -EFAULT; 2746 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2747 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2748 else 2749 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2750 __put_user(result, &_xferi->result); 2751 return result < 0 ? result : 0; 2752 } 2753 2754 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2755 struct snd_xfern __user *_xfern) 2756 { 2757 struct snd_xfern xfern; 2758 struct snd_pcm_runtime *runtime = substream->runtime; 2759 void *bufs; 2760 snd_pcm_sframes_t result; 2761 2762 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2763 return -EBADFD; 2764 if (runtime->channels > 128) 2765 return -EINVAL; 2766 if (put_user(0, &_xfern->result)) 2767 return -EFAULT; 2768 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2769 return -EFAULT; 2770 2771 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2772 if (IS_ERR(bufs)) 2773 return PTR_ERR(bufs); 2774 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2775 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2776 else 2777 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2778 kfree(bufs); 2779 __put_user(result, &_xfern->result); 2780 return result < 0 ? result : 0; 2781 } 2782 2783 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2784 snd_pcm_uframes_t __user *_frames) 2785 { 2786 snd_pcm_uframes_t frames; 2787 snd_pcm_sframes_t result; 2788 2789 if (get_user(frames, _frames)) 2790 return -EFAULT; 2791 if (put_user(0, _frames)) 2792 return -EFAULT; 2793 result = snd_pcm_rewind(substream, frames); 2794 __put_user(result, _frames); 2795 return result < 0 ? result : 0; 2796 } 2797 2798 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2799 snd_pcm_uframes_t __user *_frames) 2800 { 2801 snd_pcm_uframes_t frames; 2802 snd_pcm_sframes_t result; 2803 2804 if (get_user(frames, _frames)) 2805 return -EFAULT; 2806 if (put_user(0, _frames)) 2807 return -EFAULT; 2808 result = snd_pcm_forward(substream, frames); 2809 __put_user(result, _frames); 2810 return result < 0 ? result : 0; 2811 } 2812 2813 static int snd_pcm_common_ioctl(struct file *file, 2814 struct snd_pcm_substream *substream, 2815 unsigned int cmd, void __user *arg) 2816 { 2817 struct snd_pcm_file *pcm_file = file->private_data; 2818 int res; 2819 2820 if (PCM_RUNTIME_CHECK(substream)) 2821 return -ENXIO; 2822 2823 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2824 if (res < 0) 2825 return res; 2826 2827 switch (cmd) { 2828 case SNDRV_PCM_IOCTL_PVERSION: 2829 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2830 case SNDRV_PCM_IOCTL_INFO: 2831 return snd_pcm_info_user(substream, arg); 2832 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2833 return 0; 2834 case SNDRV_PCM_IOCTL_TTSTAMP: 2835 return snd_pcm_tstamp(substream, arg); 2836 case SNDRV_PCM_IOCTL_USER_PVERSION: 2837 if (get_user(pcm_file->user_pversion, 2838 (unsigned int __user *)arg)) 2839 return -EFAULT; 2840 return 0; 2841 case SNDRV_PCM_IOCTL_HW_REFINE: 2842 return snd_pcm_hw_refine_user(substream, arg); 2843 case SNDRV_PCM_IOCTL_HW_PARAMS: 2844 return snd_pcm_hw_params_user(substream, arg); 2845 case SNDRV_PCM_IOCTL_HW_FREE: 2846 return snd_pcm_hw_free(substream); 2847 case SNDRV_PCM_IOCTL_SW_PARAMS: 2848 return snd_pcm_sw_params_user(substream, arg); 2849 case SNDRV_PCM_IOCTL_STATUS: 2850 return snd_pcm_status_user(substream, arg, false); 2851 case SNDRV_PCM_IOCTL_STATUS_EXT: 2852 return snd_pcm_status_user(substream, arg, true); 2853 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2854 return snd_pcm_channel_info_user(substream, arg); 2855 case SNDRV_PCM_IOCTL_PREPARE: 2856 return snd_pcm_prepare(substream, file); 2857 case SNDRV_PCM_IOCTL_RESET: 2858 return snd_pcm_reset(substream); 2859 case SNDRV_PCM_IOCTL_START: 2860 return snd_pcm_start_lock_irq(substream); 2861 case SNDRV_PCM_IOCTL_LINK: 2862 return snd_pcm_link(substream, (int)(unsigned long) arg); 2863 case SNDRV_PCM_IOCTL_UNLINK: 2864 return snd_pcm_unlink(substream); 2865 case SNDRV_PCM_IOCTL_RESUME: 2866 return snd_pcm_resume(substream); 2867 case SNDRV_PCM_IOCTL_XRUN: 2868 return snd_pcm_xrun(substream); 2869 case SNDRV_PCM_IOCTL_HWSYNC: 2870 return snd_pcm_hwsync(substream); 2871 case SNDRV_PCM_IOCTL_DELAY: 2872 { 2873 snd_pcm_sframes_t delay; 2874 snd_pcm_sframes_t __user *res = arg; 2875 int err; 2876 2877 err = snd_pcm_delay(substream, &delay); 2878 if (err) 2879 return err; 2880 if (put_user(delay, res)) 2881 return -EFAULT; 2882 return 0; 2883 } 2884 case SNDRV_PCM_IOCTL_SYNC_PTR: 2885 return snd_pcm_sync_ptr(substream, arg); 2886 #ifdef CONFIG_SND_SUPPORT_OLD_API 2887 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2888 return snd_pcm_hw_refine_old_user(substream, arg); 2889 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2890 return snd_pcm_hw_params_old_user(substream, arg); 2891 #endif 2892 case SNDRV_PCM_IOCTL_DRAIN: 2893 return snd_pcm_drain(substream, file); 2894 case SNDRV_PCM_IOCTL_DROP: 2895 return snd_pcm_drop(substream); 2896 case SNDRV_PCM_IOCTL_PAUSE: 2897 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2898 substream, 2899 (int)(unsigned long)arg); 2900 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2901 case SNDRV_PCM_IOCTL_READI_FRAMES: 2902 return snd_pcm_xferi_frames_ioctl(substream, arg); 2903 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2904 case SNDRV_PCM_IOCTL_READN_FRAMES: 2905 return snd_pcm_xfern_frames_ioctl(substream, arg); 2906 case SNDRV_PCM_IOCTL_REWIND: 2907 return snd_pcm_rewind_ioctl(substream, arg); 2908 case SNDRV_PCM_IOCTL_FORWARD: 2909 return snd_pcm_forward_ioctl(substream, arg); 2910 } 2911 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2912 return -ENOTTY; 2913 } 2914 2915 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2916 unsigned long arg) 2917 { 2918 struct snd_pcm_file *pcm_file; 2919 2920 pcm_file = file->private_data; 2921 2922 if (((cmd >> 8) & 0xff) != 'A') 2923 return -ENOTTY; 2924 2925 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2926 (void __user *)arg); 2927 } 2928 2929 /** 2930 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2931 * @substream: PCM substream 2932 * @cmd: IOCTL cmd 2933 * @arg: IOCTL argument 2934 * 2935 * The function is provided primarily for OSS layer and USB gadget drivers, 2936 * and it allows only the limited set of ioctls (hw_params, sw_params, 2937 * prepare, start, drain, drop, forward). 2938 */ 2939 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2940 unsigned int cmd, void *arg) 2941 { 2942 snd_pcm_uframes_t *frames = arg; 2943 snd_pcm_sframes_t result; 2944 2945 switch (cmd) { 2946 case SNDRV_PCM_IOCTL_FORWARD: 2947 { 2948 /* provided only for OSS; capture-only and no value returned */ 2949 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 2950 return -EINVAL; 2951 result = snd_pcm_forward(substream, *frames); 2952 return result < 0 ? result : 0; 2953 } 2954 case SNDRV_PCM_IOCTL_HW_PARAMS: 2955 return snd_pcm_hw_params(substream, arg); 2956 case SNDRV_PCM_IOCTL_SW_PARAMS: 2957 return snd_pcm_sw_params(substream, arg); 2958 case SNDRV_PCM_IOCTL_PREPARE: 2959 return snd_pcm_prepare(substream, NULL); 2960 case SNDRV_PCM_IOCTL_START: 2961 return snd_pcm_start_lock_irq(substream); 2962 case SNDRV_PCM_IOCTL_DRAIN: 2963 return snd_pcm_drain(substream, NULL); 2964 case SNDRV_PCM_IOCTL_DROP: 2965 return snd_pcm_drop(substream); 2966 case SNDRV_PCM_IOCTL_DELAY: 2967 return snd_pcm_delay(substream, frames); 2968 default: 2969 return -EINVAL; 2970 } 2971 } 2972 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2973 2974 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2975 loff_t * offset) 2976 { 2977 struct snd_pcm_file *pcm_file; 2978 struct snd_pcm_substream *substream; 2979 struct snd_pcm_runtime *runtime; 2980 snd_pcm_sframes_t result; 2981 2982 pcm_file = file->private_data; 2983 substream = pcm_file->substream; 2984 if (PCM_RUNTIME_CHECK(substream)) 2985 return -ENXIO; 2986 runtime = substream->runtime; 2987 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2988 return -EBADFD; 2989 if (!frame_aligned(runtime, count)) 2990 return -EINVAL; 2991 count = bytes_to_frames(runtime, count); 2992 result = snd_pcm_lib_read(substream, buf, count); 2993 if (result > 0) 2994 result = frames_to_bytes(runtime, result); 2995 return result; 2996 } 2997 2998 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2999 size_t count, loff_t * offset) 3000 { 3001 struct snd_pcm_file *pcm_file; 3002 struct snd_pcm_substream *substream; 3003 struct snd_pcm_runtime *runtime; 3004 snd_pcm_sframes_t result; 3005 3006 pcm_file = file->private_data; 3007 substream = pcm_file->substream; 3008 if (PCM_RUNTIME_CHECK(substream)) 3009 return -ENXIO; 3010 runtime = substream->runtime; 3011 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3012 return -EBADFD; 3013 if (!frame_aligned(runtime, count)) 3014 return -EINVAL; 3015 count = bytes_to_frames(runtime, count); 3016 result = snd_pcm_lib_write(substream, buf, count); 3017 if (result > 0) 3018 result = frames_to_bytes(runtime, result); 3019 return result; 3020 } 3021 3022 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3023 { 3024 struct snd_pcm_file *pcm_file; 3025 struct snd_pcm_substream *substream; 3026 struct snd_pcm_runtime *runtime; 3027 snd_pcm_sframes_t result; 3028 unsigned long i; 3029 void __user **bufs; 3030 snd_pcm_uframes_t frames; 3031 3032 pcm_file = iocb->ki_filp->private_data; 3033 substream = pcm_file->substream; 3034 if (PCM_RUNTIME_CHECK(substream)) 3035 return -ENXIO; 3036 runtime = substream->runtime; 3037 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3038 return -EBADFD; 3039 if (!iter_is_iovec(to)) 3040 return -EINVAL; 3041 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3042 return -EINVAL; 3043 if (!frame_aligned(runtime, to->iov->iov_len)) 3044 return -EINVAL; 3045 frames = bytes_to_samples(runtime, to->iov->iov_len); 3046 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3047 if (bufs == NULL) 3048 return -ENOMEM; 3049 for (i = 0; i < to->nr_segs; ++i) 3050 bufs[i] = to->iov[i].iov_base; 3051 result = snd_pcm_lib_readv(substream, bufs, frames); 3052 if (result > 0) 3053 result = frames_to_bytes(runtime, result); 3054 kfree(bufs); 3055 return result; 3056 } 3057 3058 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3059 { 3060 struct snd_pcm_file *pcm_file; 3061 struct snd_pcm_substream *substream; 3062 struct snd_pcm_runtime *runtime; 3063 snd_pcm_sframes_t result; 3064 unsigned long i; 3065 void __user **bufs; 3066 snd_pcm_uframes_t frames; 3067 3068 pcm_file = iocb->ki_filp->private_data; 3069 substream = pcm_file->substream; 3070 if (PCM_RUNTIME_CHECK(substream)) 3071 return -ENXIO; 3072 runtime = substream->runtime; 3073 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3074 return -EBADFD; 3075 if (!iter_is_iovec(from)) 3076 return -EINVAL; 3077 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3078 !frame_aligned(runtime, from->iov->iov_len)) 3079 return -EINVAL; 3080 frames = bytes_to_samples(runtime, from->iov->iov_len); 3081 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3082 if (bufs == NULL) 3083 return -ENOMEM; 3084 for (i = 0; i < from->nr_segs; ++i) 3085 bufs[i] = from->iov[i].iov_base; 3086 result = snd_pcm_lib_writev(substream, bufs, frames); 3087 if (result > 0) 3088 result = frames_to_bytes(runtime, result); 3089 kfree(bufs); 3090 return result; 3091 } 3092 3093 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3094 { 3095 struct snd_pcm_file *pcm_file; 3096 struct snd_pcm_substream *substream; 3097 struct snd_pcm_runtime *runtime; 3098 __poll_t mask, ok; 3099 snd_pcm_uframes_t avail; 3100 3101 pcm_file = file->private_data; 3102 3103 substream = pcm_file->substream; 3104 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3105 ok = EPOLLOUT | EPOLLWRNORM; 3106 else 3107 ok = EPOLLIN | EPOLLRDNORM; 3108 if (PCM_RUNTIME_CHECK(substream)) 3109 return ok | EPOLLERR; 3110 3111 runtime = substream->runtime; 3112 poll_wait(file, &runtime->sleep, wait); 3113 3114 mask = 0; 3115 snd_pcm_stream_lock_irq(substream); 3116 avail = snd_pcm_avail(substream); 3117 switch (runtime->status->state) { 3118 case SNDRV_PCM_STATE_RUNNING: 3119 case SNDRV_PCM_STATE_PREPARED: 3120 case SNDRV_PCM_STATE_PAUSED: 3121 if (avail >= runtime->control->avail_min) 3122 mask = ok; 3123 break; 3124 case SNDRV_PCM_STATE_DRAINING: 3125 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3126 mask = ok; 3127 if (!avail) 3128 mask |= EPOLLERR; 3129 } 3130 break; 3131 default: 3132 mask = ok | EPOLLERR; 3133 break; 3134 } 3135 snd_pcm_stream_unlock_irq(substream); 3136 return mask; 3137 } 3138 3139 /* 3140 * mmap support 3141 */ 3142 3143 /* 3144 * Only on coherent architectures, we can mmap the status and the control records 3145 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3146 */ 3147 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3148 /* 3149 * mmap status record 3150 */ 3151 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3152 { 3153 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3154 struct snd_pcm_runtime *runtime; 3155 3156 if (substream == NULL) 3157 return VM_FAULT_SIGBUS; 3158 runtime = substream->runtime; 3159 vmf->page = virt_to_page(runtime->status); 3160 get_page(vmf->page); 3161 return 0; 3162 } 3163 3164 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3165 { 3166 .fault = snd_pcm_mmap_status_fault, 3167 }; 3168 3169 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3170 struct vm_area_struct *area) 3171 { 3172 long size; 3173 if (!(area->vm_flags & VM_READ)) 3174 return -EINVAL; 3175 size = area->vm_end - area->vm_start; 3176 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3177 return -EINVAL; 3178 area->vm_ops = &snd_pcm_vm_ops_status; 3179 area->vm_private_data = substream; 3180 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3181 return 0; 3182 } 3183 3184 /* 3185 * mmap control record 3186 */ 3187 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3188 { 3189 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3190 struct snd_pcm_runtime *runtime; 3191 3192 if (substream == NULL) 3193 return VM_FAULT_SIGBUS; 3194 runtime = substream->runtime; 3195 vmf->page = virt_to_page(runtime->control); 3196 get_page(vmf->page); 3197 return 0; 3198 } 3199 3200 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3201 { 3202 .fault = snd_pcm_mmap_control_fault, 3203 }; 3204 3205 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3206 struct vm_area_struct *area) 3207 { 3208 long size; 3209 if (!(area->vm_flags & VM_READ)) 3210 return -EINVAL; 3211 size = area->vm_end - area->vm_start; 3212 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3213 return -EINVAL; 3214 area->vm_ops = &snd_pcm_vm_ops_control; 3215 area->vm_private_data = substream; 3216 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3217 return 0; 3218 } 3219 3220 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3221 { 3222 if (pcm_file->no_compat_mmap) 3223 return false; 3224 /* See pcm_control_mmap_allowed() below. 3225 * Since older alsa-lib requires both status and control mmaps to be 3226 * coupled, we have to disable the status mmap for old alsa-lib, too. 3227 */ 3228 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3229 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3230 return false; 3231 return true; 3232 } 3233 3234 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3235 { 3236 if (pcm_file->no_compat_mmap) 3237 return false; 3238 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3239 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3240 * thus it effectively assures the manual update of appl_ptr. 3241 */ 3242 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3243 return false; 3244 return true; 3245 } 3246 3247 #else /* ! coherent mmap */ 3248 /* 3249 * don't support mmap for status and control records. 3250 */ 3251 #define pcm_status_mmap_allowed(pcm_file) false 3252 #define pcm_control_mmap_allowed(pcm_file) false 3253 3254 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3255 struct vm_area_struct *area) 3256 { 3257 return -ENXIO; 3258 } 3259 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3260 struct vm_area_struct *area) 3261 { 3262 return -ENXIO; 3263 } 3264 #endif /* coherent mmap */ 3265 3266 static inline struct page * 3267 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3268 { 3269 void *vaddr = substream->runtime->dma_area + ofs; 3270 return virt_to_page(vaddr); 3271 } 3272 3273 /* 3274 * fault callback for mmapping a RAM page 3275 */ 3276 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3277 { 3278 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3279 struct snd_pcm_runtime *runtime; 3280 unsigned long offset; 3281 struct page * page; 3282 size_t dma_bytes; 3283 3284 if (substream == NULL) 3285 return VM_FAULT_SIGBUS; 3286 runtime = substream->runtime; 3287 offset = vmf->pgoff << PAGE_SHIFT; 3288 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3289 if (offset > dma_bytes - PAGE_SIZE) 3290 return VM_FAULT_SIGBUS; 3291 if (substream->ops->page) 3292 page = substream->ops->page(substream, offset); 3293 else 3294 page = snd_pcm_default_page_ops(substream, offset); 3295 if (!page) 3296 return VM_FAULT_SIGBUS; 3297 get_page(page); 3298 vmf->page = page; 3299 return 0; 3300 } 3301 3302 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3303 .open = snd_pcm_mmap_data_open, 3304 .close = snd_pcm_mmap_data_close, 3305 }; 3306 3307 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3308 .open = snd_pcm_mmap_data_open, 3309 .close = snd_pcm_mmap_data_close, 3310 .fault = snd_pcm_mmap_data_fault, 3311 }; 3312 3313 /* 3314 * mmap the DMA buffer on RAM 3315 */ 3316 3317 /** 3318 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3319 * @substream: PCM substream 3320 * @area: VMA 3321 * 3322 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3323 * this function is invoked implicitly. 3324 */ 3325 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3326 struct vm_area_struct *area) 3327 { 3328 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3329 #ifdef CONFIG_GENERIC_ALLOCATOR 3330 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3331 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3332 return remap_pfn_range(area, area->vm_start, 3333 substream->dma_buffer.addr >> PAGE_SHIFT, 3334 area->vm_end - area->vm_start, area->vm_page_prot); 3335 } 3336 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3337 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3338 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3339 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3340 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3341 area, 3342 substream->runtime->dma_area, 3343 substream->runtime->dma_addr, 3344 substream->runtime->dma_bytes); 3345 #endif /* CONFIG_X86 */ 3346 /* mmap with fault handler */ 3347 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3348 return 0; 3349 } 3350 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3351 3352 /* 3353 * mmap the DMA buffer on I/O memory area 3354 */ 3355 #if SNDRV_PCM_INFO_MMAP_IOMEM 3356 /** 3357 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3358 * @substream: PCM substream 3359 * @area: VMA 3360 * 3361 * When your hardware uses the iomapped pages as the hardware buffer and 3362 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3363 * is supposed to work only on limited architectures. 3364 */ 3365 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3366 struct vm_area_struct *area) 3367 { 3368 struct snd_pcm_runtime *runtime = substream->runtime; 3369 3370 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3371 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3372 } 3373 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3374 #endif /* SNDRV_PCM_INFO_MMAP */ 3375 3376 /* 3377 * mmap DMA buffer 3378 */ 3379 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3380 struct vm_area_struct *area) 3381 { 3382 struct snd_pcm_runtime *runtime; 3383 long size; 3384 unsigned long offset; 3385 size_t dma_bytes; 3386 int err; 3387 3388 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3389 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3390 return -EINVAL; 3391 } else { 3392 if (!(area->vm_flags & VM_READ)) 3393 return -EINVAL; 3394 } 3395 runtime = substream->runtime; 3396 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3397 return -EBADFD; 3398 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3399 return -ENXIO; 3400 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3401 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3402 return -EINVAL; 3403 size = area->vm_end - area->vm_start; 3404 offset = area->vm_pgoff << PAGE_SHIFT; 3405 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3406 if ((size_t)size > dma_bytes) 3407 return -EINVAL; 3408 if (offset > dma_bytes - size) 3409 return -EINVAL; 3410 3411 area->vm_ops = &snd_pcm_vm_ops_data; 3412 area->vm_private_data = substream; 3413 if (substream->ops->mmap) 3414 err = substream->ops->mmap(substream, area); 3415 else 3416 err = snd_pcm_lib_default_mmap(substream, area); 3417 if (!err) 3418 atomic_inc(&substream->mmap_count); 3419 return err; 3420 } 3421 EXPORT_SYMBOL(snd_pcm_mmap_data); 3422 3423 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3424 { 3425 struct snd_pcm_file * pcm_file; 3426 struct snd_pcm_substream *substream; 3427 unsigned long offset; 3428 3429 pcm_file = file->private_data; 3430 substream = pcm_file->substream; 3431 if (PCM_RUNTIME_CHECK(substream)) 3432 return -ENXIO; 3433 3434 offset = area->vm_pgoff << PAGE_SHIFT; 3435 switch (offset) { 3436 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3437 if (!pcm_status_mmap_allowed(pcm_file)) 3438 return -ENXIO; 3439 return snd_pcm_mmap_status(substream, file, area); 3440 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3441 if (!pcm_control_mmap_allowed(pcm_file)) 3442 return -ENXIO; 3443 return snd_pcm_mmap_control(substream, file, area); 3444 default: 3445 return snd_pcm_mmap_data(substream, file, area); 3446 } 3447 return 0; 3448 } 3449 3450 static int snd_pcm_fasync(int fd, struct file * file, int on) 3451 { 3452 struct snd_pcm_file * pcm_file; 3453 struct snd_pcm_substream *substream; 3454 struct snd_pcm_runtime *runtime; 3455 3456 pcm_file = file->private_data; 3457 substream = pcm_file->substream; 3458 if (PCM_RUNTIME_CHECK(substream)) 3459 return -ENXIO; 3460 runtime = substream->runtime; 3461 return fasync_helper(fd, file, on, &runtime->fasync); 3462 } 3463 3464 /* 3465 * ioctl32 compat 3466 */ 3467 #ifdef CONFIG_COMPAT 3468 #include "pcm_compat.c" 3469 #else 3470 #define snd_pcm_ioctl_compat NULL 3471 #endif 3472 3473 /* 3474 * To be removed helpers to keep binary compatibility 3475 */ 3476 3477 #ifdef CONFIG_SND_SUPPORT_OLD_API 3478 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3479 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3480 3481 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3482 struct snd_pcm_hw_params_old *oparams) 3483 { 3484 unsigned int i; 3485 3486 memset(params, 0, sizeof(*params)); 3487 params->flags = oparams->flags; 3488 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3489 params->masks[i].bits[0] = oparams->masks[i]; 3490 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3491 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3492 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3493 params->info = oparams->info; 3494 params->msbits = oparams->msbits; 3495 params->rate_num = oparams->rate_num; 3496 params->rate_den = oparams->rate_den; 3497 params->fifo_size = oparams->fifo_size; 3498 } 3499 3500 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3501 struct snd_pcm_hw_params *params) 3502 { 3503 unsigned int i; 3504 3505 memset(oparams, 0, sizeof(*oparams)); 3506 oparams->flags = params->flags; 3507 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3508 oparams->masks[i] = params->masks[i].bits[0]; 3509 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3510 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3511 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3512 oparams->info = params->info; 3513 oparams->msbits = params->msbits; 3514 oparams->rate_num = params->rate_num; 3515 oparams->rate_den = params->rate_den; 3516 oparams->fifo_size = params->fifo_size; 3517 } 3518 3519 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3520 struct snd_pcm_hw_params_old __user * _oparams) 3521 { 3522 struct snd_pcm_hw_params *params; 3523 struct snd_pcm_hw_params_old *oparams = NULL; 3524 int err; 3525 3526 params = kmalloc(sizeof(*params), GFP_KERNEL); 3527 if (!params) 3528 return -ENOMEM; 3529 3530 oparams = memdup_user(_oparams, sizeof(*oparams)); 3531 if (IS_ERR(oparams)) { 3532 err = PTR_ERR(oparams); 3533 goto out; 3534 } 3535 snd_pcm_hw_convert_from_old_params(params, oparams); 3536 err = snd_pcm_hw_refine(substream, params); 3537 if (err < 0) 3538 goto out_old; 3539 3540 err = fixup_unreferenced_params(substream, params); 3541 if (err < 0) 3542 goto out_old; 3543 3544 snd_pcm_hw_convert_to_old_params(oparams, params); 3545 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3546 err = -EFAULT; 3547 out_old: 3548 kfree(oparams); 3549 out: 3550 kfree(params); 3551 return err; 3552 } 3553 3554 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3555 struct snd_pcm_hw_params_old __user * _oparams) 3556 { 3557 struct snd_pcm_hw_params *params; 3558 struct snd_pcm_hw_params_old *oparams = NULL; 3559 int err; 3560 3561 params = kmalloc(sizeof(*params), GFP_KERNEL); 3562 if (!params) 3563 return -ENOMEM; 3564 3565 oparams = memdup_user(_oparams, sizeof(*oparams)); 3566 if (IS_ERR(oparams)) { 3567 err = PTR_ERR(oparams); 3568 goto out; 3569 } 3570 3571 snd_pcm_hw_convert_from_old_params(params, oparams); 3572 err = snd_pcm_hw_params(substream, params); 3573 if (err < 0) 3574 goto out_old; 3575 3576 snd_pcm_hw_convert_to_old_params(oparams, params); 3577 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3578 err = -EFAULT; 3579 out_old: 3580 kfree(oparams); 3581 out: 3582 kfree(params); 3583 return err; 3584 } 3585 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3586 3587 #ifndef CONFIG_MMU 3588 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3589 unsigned long addr, 3590 unsigned long len, 3591 unsigned long pgoff, 3592 unsigned long flags) 3593 { 3594 struct snd_pcm_file *pcm_file = file->private_data; 3595 struct snd_pcm_substream *substream = pcm_file->substream; 3596 struct snd_pcm_runtime *runtime = substream->runtime; 3597 unsigned long offset = pgoff << PAGE_SHIFT; 3598 3599 switch (offset) { 3600 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3601 return (unsigned long)runtime->status; 3602 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3603 return (unsigned long)runtime->control; 3604 default: 3605 return (unsigned long)runtime->dma_area + offset; 3606 } 3607 } 3608 #else 3609 # define snd_pcm_get_unmapped_area NULL 3610 #endif 3611 3612 /* 3613 * Register section 3614 */ 3615 3616 const struct file_operations snd_pcm_f_ops[2] = { 3617 { 3618 .owner = THIS_MODULE, 3619 .write = snd_pcm_write, 3620 .write_iter = snd_pcm_writev, 3621 .open = snd_pcm_playback_open, 3622 .release = snd_pcm_release, 3623 .llseek = no_llseek, 3624 .poll = snd_pcm_poll, 3625 .unlocked_ioctl = snd_pcm_ioctl, 3626 .compat_ioctl = snd_pcm_ioctl_compat, 3627 .mmap = snd_pcm_mmap, 3628 .fasync = snd_pcm_fasync, 3629 .get_unmapped_area = snd_pcm_get_unmapped_area, 3630 }, 3631 { 3632 .owner = THIS_MODULE, 3633 .read = snd_pcm_read, 3634 .read_iter = snd_pcm_readv, 3635 .open = snd_pcm_capture_open, 3636 .release = snd_pcm_release, 3637 .llseek = no_llseek, 3638 .poll = snd_pcm_poll, 3639 .unlocked_ioctl = snd_pcm_ioctl, 3640 .compat_ioctl = snd_pcm_ioctl_compat, 3641 .mmap = snd_pcm_mmap, 3642 .fasync = snd_pcm_fasync, 3643 .get_unmapped_area = snd_pcm_get_unmapped_area, 3644 } 3645 }; 3646