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 int snd_pcm_status(struct snd_pcm_substream *substream, 861 struct snd_pcm_status *status) 862 { 863 struct snd_pcm_runtime *runtime = substream->runtime; 864 865 snd_pcm_stream_lock_irq(substream); 866 867 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 868 &runtime->audio_tstamp_config); 869 870 /* backwards compatible behavior */ 871 if (runtime->audio_tstamp_config.type_requested == 872 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 873 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 874 runtime->audio_tstamp_config.type_requested = 875 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 876 else 877 runtime->audio_tstamp_config.type_requested = 878 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 879 runtime->audio_tstamp_report.valid = 0; 880 } else 881 runtime->audio_tstamp_report.valid = 1; 882 883 status->state = runtime->status->state; 884 status->suspended_state = runtime->status->suspended_state; 885 if (status->state == SNDRV_PCM_STATE_OPEN) 886 goto _end; 887 status->trigger_tstamp = runtime->trigger_tstamp; 888 if (snd_pcm_running(substream)) { 889 snd_pcm_update_hw_ptr(substream); 890 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 891 status->tstamp = runtime->status->tstamp; 892 status->driver_tstamp = runtime->driver_tstamp; 893 status->audio_tstamp = 894 runtime->status->audio_tstamp; 895 if (runtime->audio_tstamp_report.valid == 1) 896 /* backwards compatibility, no report provided in COMPAT mode */ 897 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 898 &status->audio_tstamp_accuracy, 899 &runtime->audio_tstamp_report); 900 901 goto _tstamp_end; 902 } 903 } else { 904 /* get tstamp only in fallback mode and only if enabled */ 905 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 906 snd_pcm_gettime(runtime, &status->tstamp); 907 } 908 _tstamp_end: 909 status->appl_ptr = runtime->control->appl_ptr; 910 status->hw_ptr = runtime->status->hw_ptr; 911 status->avail = snd_pcm_avail(substream); 912 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 913 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 914 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 915 status->delay = runtime->buffer_size - status->avail; 916 status->delay += runtime->delay; 917 } else 918 status->delay = 0; 919 } else { 920 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 921 status->delay = status->avail + runtime->delay; 922 else 923 status->delay = 0; 924 } 925 status->avail_max = runtime->avail_max; 926 status->overrange = runtime->overrange; 927 runtime->avail_max = 0; 928 runtime->overrange = 0; 929 _end: 930 snd_pcm_stream_unlock_irq(substream); 931 return 0; 932 } 933 934 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 935 struct snd_pcm_status __user * _status, 936 bool ext) 937 { 938 struct snd_pcm_status status; 939 int res; 940 941 memset(&status, 0, sizeof(status)); 942 /* 943 * with extension, parameters are read/write, 944 * get audio_tstamp_data from user, 945 * ignore rest of status structure 946 */ 947 if (ext && get_user(status.audio_tstamp_data, 948 (u32 __user *)(&_status->audio_tstamp_data))) 949 return -EFAULT; 950 res = snd_pcm_status(substream, &status); 951 if (res < 0) 952 return res; 953 if (copy_to_user(_status, &status, sizeof(status))) 954 return -EFAULT; 955 return 0; 956 } 957 958 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 959 struct snd_pcm_channel_info * info) 960 { 961 struct snd_pcm_runtime *runtime; 962 unsigned int channel; 963 964 channel = info->channel; 965 runtime = substream->runtime; 966 snd_pcm_stream_lock_irq(substream); 967 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 968 snd_pcm_stream_unlock_irq(substream); 969 return -EBADFD; 970 } 971 snd_pcm_stream_unlock_irq(substream); 972 if (channel >= runtime->channels) 973 return -EINVAL; 974 memset(info, 0, sizeof(*info)); 975 info->channel = channel; 976 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 977 } 978 979 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 980 struct snd_pcm_channel_info __user * _info) 981 { 982 struct snd_pcm_channel_info info; 983 int res; 984 985 if (copy_from_user(&info, _info, sizeof(info))) 986 return -EFAULT; 987 res = snd_pcm_channel_info(substream, &info); 988 if (res < 0) 989 return res; 990 if (copy_to_user(_info, &info, sizeof(info))) 991 return -EFAULT; 992 return 0; 993 } 994 995 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 996 { 997 struct snd_pcm_runtime *runtime = substream->runtime; 998 if (runtime->trigger_master == NULL) 999 return; 1000 if (runtime->trigger_master == substream) { 1001 if (!runtime->trigger_tstamp_latched) 1002 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1003 } else { 1004 snd_pcm_trigger_tstamp(runtime->trigger_master); 1005 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1006 } 1007 runtime->trigger_master = NULL; 1008 } 1009 1010 struct action_ops { 1011 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1012 int (*do_action)(struct snd_pcm_substream *substream, int state); 1013 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1014 void (*post_action)(struct snd_pcm_substream *substream, int state); 1015 }; 1016 1017 /* 1018 * this functions is core for handling of linked stream 1019 * Note: the stream state might be changed also on failure 1020 * Note2: call with calling stream lock + link lock 1021 */ 1022 static int snd_pcm_action_group(const struct action_ops *ops, 1023 struct snd_pcm_substream *substream, 1024 int state, int do_lock) 1025 { 1026 struct snd_pcm_substream *s = NULL; 1027 struct snd_pcm_substream *s1; 1028 int res = 0, depth = 1; 1029 1030 snd_pcm_group_for_each_entry(s, substream) { 1031 if (do_lock && s != substream) { 1032 if (s->pcm->nonatomic) 1033 mutex_lock_nested(&s->self_group.mutex, depth); 1034 else 1035 spin_lock_nested(&s->self_group.lock, depth); 1036 depth++; 1037 } 1038 res = ops->pre_action(s, state); 1039 if (res < 0) 1040 goto _unlock; 1041 } 1042 snd_pcm_group_for_each_entry(s, substream) { 1043 res = ops->do_action(s, state); 1044 if (res < 0) { 1045 if (ops->undo_action) { 1046 snd_pcm_group_for_each_entry(s1, substream) { 1047 if (s1 == s) /* failed stream */ 1048 break; 1049 ops->undo_action(s1, state); 1050 } 1051 } 1052 s = NULL; /* unlock all */ 1053 goto _unlock; 1054 } 1055 } 1056 snd_pcm_group_for_each_entry(s, substream) { 1057 ops->post_action(s, state); 1058 } 1059 _unlock: 1060 if (do_lock) { 1061 /* unlock streams */ 1062 snd_pcm_group_for_each_entry(s1, substream) { 1063 if (s1 != substream) { 1064 if (s1->pcm->nonatomic) 1065 mutex_unlock(&s1->self_group.mutex); 1066 else 1067 spin_unlock(&s1->self_group.lock); 1068 } 1069 if (s1 == s) /* end */ 1070 break; 1071 } 1072 } 1073 return res; 1074 } 1075 1076 /* 1077 * Note: call with stream lock 1078 */ 1079 static int snd_pcm_action_single(const struct action_ops *ops, 1080 struct snd_pcm_substream *substream, 1081 int state) 1082 { 1083 int res; 1084 1085 res = ops->pre_action(substream, state); 1086 if (res < 0) 1087 return res; 1088 res = ops->do_action(substream, state); 1089 if (res == 0) 1090 ops->post_action(substream, state); 1091 else if (ops->undo_action) 1092 ops->undo_action(substream, state); 1093 return res; 1094 } 1095 1096 /* 1097 * Note: call with stream lock 1098 */ 1099 static int snd_pcm_action(const struct action_ops *ops, 1100 struct snd_pcm_substream *substream, 1101 int state) 1102 { 1103 int res; 1104 1105 if (!snd_pcm_stream_linked(substream)) 1106 return snd_pcm_action_single(ops, substream, state); 1107 1108 if (substream->pcm->nonatomic) { 1109 if (!mutex_trylock(&substream->group->mutex)) { 1110 mutex_unlock(&substream->self_group.mutex); 1111 mutex_lock(&substream->group->mutex); 1112 mutex_lock(&substream->self_group.mutex); 1113 } 1114 res = snd_pcm_action_group(ops, substream, state, 1); 1115 mutex_unlock(&substream->group->mutex); 1116 } else { 1117 if (!spin_trylock(&substream->group->lock)) { 1118 spin_unlock(&substream->self_group.lock); 1119 spin_lock(&substream->group->lock); 1120 spin_lock(&substream->self_group.lock); 1121 } 1122 res = snd_pcm_action_group(ops, substream, state, 1); 1123 spin_unlock(&substream->group->lock); 1124 } 1125 return res; 1126 } 1127 1128 /* 1129 * Note: don't use any locks before 1130 */ 1131 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1132 struct snd_pcm_substream *substream, 1133 int state) 1134 { 1135 int res; 1136 1137 snd_pcm_stream_lock_irq(substream); 1138 res = snd_pcm_action(ops, substream, state); 1139 snd_pcm_stream_unlock_irq(substream); 1140 return res; 1141 } 1142 1143 /* 1144 */ 1145 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1146 struct snd_pcm_substream *substream, 1147 int state) 1148 { 1149 int res; 1150 1151 down_read(&snd_pcm_link_rwsem); 1152 if (snd_pcm_stream_linked(substream)) 1153 res = snd_pcm_action_group(ops, substream, state, 0); 1154 else 1155 res = snd_pcm_action_single(ops, substream, state); 1156 up_read(&snd_pcm_link_rwsem); 1157 return res; 1158 } 1159 1160 /* 1161 * start callbacks 1162 */ 1163 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1164 { 1165 struct snd_pcm_runtime *runtime = substream->runtime; 1166 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1167 return -EBADFD; 1168 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1169 !snd_pcm_playback_data(substream)) 1170 return -EPIPE; 1171 runtime->trigger_tstamp_latched = false; 1172 runtime->trigger_master = substream; 1173 return 0; 1174 } 1175 1176 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1177 { 1178 if (substream->runtime->trigger_master != substream) 1179 return 0; 1180 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1181 } 1182 1183 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1184 { 1185 if (substream->runtime->trigger_master == substream) 1186 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1187 } 1188 1189 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1190 { 1191 struct snd_pcm_runtime *runtime = substream->runtime; 1192 snd_pcm_trigger_tstamp(substream); 1193 runtime->hw_ptr_jiffies = jiffies; 1194 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1195 runtime->rate; 1196 runtime->status->state = state; 1197 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1198 runtime->silence_size > 0) 1199 snd_pcm_playback_silence(substream, ULONG_MAX); 1200 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1201 } 1202 1203 static const struct action_ops snd_pcm_action_start = { 1204 .pre_action = snd_pcm_pre_start, 1205 .do_action = snd_pcm_do_start, 1206 .undo_action = snd_pcm_undo_start, 1207 .post_action = snd_pcm_post_start 1208 }; 1209 1210 /** 1211 * snd_pcm_start - start all linked streams 1212 * @substream: the PCM substream instance 1213 * 1214 * Return: Zero if successful, or a negative error code. 1215 * The stream lock must be acquired before calling this function. 1216 */ 1217 int snd_pcm_start(struct snd_pcm_substream *substream) 1218 { 1219 return snd_pcm_action(&snd_pcm_action_start, substream, 1220 SNDRV_PCM_STATE_RUNNING); 1221 } 1222 1223 /* take the stream lock and start the streams */ 1224 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1225 { 1226 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1227 SNDRV_PCM_STATE_RUNNING); 1228 } 1229 1230 /* 1231 * stop callbacks 1232 */ 1233 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1234 { 1235 struct snd_pcm_runtime *runtime = substream->runtime; 1236 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1237 return -EBADFD; 1238 runtime->trigger_master = substream; 1239 return 0; 1240 } 1241 1242 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1243 { 1244 if (substream->runtime->trigger_master == substream && 1245 snd_pcm_running(substream)) 1246 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1247 return 0; /* unconditonally stop all substreams */ 1248 } 1249 1250 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1251 { 1252 struct snd_pcm_runtime *runtime = substream->runtime; 1253 if (runtime->status->state != state) { 1254 snd_pcm_trigger_tstamp(substream); 1255 runtime->status->state = state; 1256 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1257 } 1258 wake_up(&runtime->sleep); 1259 wake_up(&runtime->tsleep); 1260 } 1261 1262 static const struct action_ops snd_pcm_action_stop = { 1263 .pre_action = snd_pcm_pre_stop, 1264 .do_action = snd_pcm_do_stop, 1265 .post_action = snd_pcm_post_stop 1266 }; 1267 1268 /** 1269 * snd_pcm_stop - try to stop all running streams in the substream group 1270 * @substream: the PCM substream instance 1271 * @state: PCM state after stopping the stream 1272 * 1273 * The state of each stream is then changed to the given state unconditionally. 1274 * 1275 * Return: Zero if successful, or a negative error code. 1276 */ 1277 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1278 { 1279 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1280 } 1281 EXPORT_SYMBOL(snd_pcm_stop); 1282 1283 /** 1284 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1285 * @substream: the PCM substream 1286 * 1287 * After stopping, the state is changed to SETUP. 1288 * Unlike snd_pcm_stop(), this affects only the given stream. 1289 * 1290 * Return: Zero if succesful, or a negative error code. 1291 */ 1292 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1293 { 1294 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1295 SNDRV_PCM_STATE_SETUP); 1296 } 1297 1298 /** 1299 * snd_pcm_stop_xrun - stop the running streams as XRUN 1300 * @substream: the PCM substream instance 1301 * 1302 * This stops the given running substream (and all linked substreams) as XRUN. 1303 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1304 * 1305 * Return: Zero if successful, or a negative error code. 1306 */ 1307 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1308 { 1309 unsigned long flags; 1310 int ret = 0; 1311 1312 snd_pcm_stream_lock_irqsave(substream, flags); 1313 if (snd_pcm_running(substream)) 1314 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1315 snd_pcm_stream_unlock_irqrestore(substream, flags); 1316 return ret; 1317 } 1318 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1319 1320 /* 1321 * pause callbacks 1322 */ 1323 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1324 { 1325 struct snd_pcm_runtime *runtime = substream->runtime; 1326 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1327 return -ENOSYS; 1328 if (push) { 1329 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1330 return -EBADFD; 1331 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1332 return -EBADFD; 1333 runtime->trigger_master = substream; 1334 return 0; 1335 } 1336 1337 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1338 { 1339 if (substream->runtime->trigger_master != substream) 1340 return 0; 1341 /* some drivers might use hw_ptr to recover from the pause - 1342 update the hw_ptr now */ 1343 if (push) 1344 snd_pcm_update_hw_ptr(substream); 1345 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1346 * a delta between the current jiffies, this gives a large enough 1347 * delta, effectively to skip the check once. 1348 */ 1349 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1350 return substream->ops->trigger(substream, 1351 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1352 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1353 } 1354 1355 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1356 { 1357 if (substream->runtime->trigger_master == substream) 1358 substream->ops->trigger(substream, 1359 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1360 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1361 } 1362 1363 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1364 { 1365 struct snd_pcm_runtime *runtime = substream->runtime; 1366 snd_pcm_trigger_tstamp(substream); 1367 if (push) { 1368 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1369 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1370 wake_up(&runtime->sleep); 1371 wake_up(&runtime->tsleep); 1372 } else { 1373 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1374 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1375 } 1376 } 1377 1378 static const struct action_ops snd_pcm_action_pause = { 1379 .pre_action = snd_pcm_pre_pause, 1380 .do_action = snd_pcm_do_pause, 1381 .undo_action = snd_pcm_undo_pause, 1382 .post_action = snd_pcm_post_pause 1383 }; 1384 1385 /* 1386 * Push/release the pause for all linked streams. 1387 */ 1388 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1389 { 1390 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1391 } 1392 1393 #ifdef CONFIG_PM 1394 /* suspend */ 1395 1396 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1397 { 1398 struct snd_pcm_runtime *runtime = substream->runtime; 1399 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1400 return -EBUSY; 1401 runtime->trigger_master = substream; 1402 return 0; 1403 } 1404 1405 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1406 { 1407 struct snd_pcm_runtime *runtime = substream->runtime; 1408 if (runtime->trigger_master != substream) 1409 return 0; 1410 if (! snd_pcm_running(substream)) 1411 return 0; 1412 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1413 return 0; /* suspend unconditionally */ 1414 } 1415 1416 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1417 { 1418 struct snd_pcm_runtime *runtime = substream->runtime; 1419 snd_pcm_trigger_tstamp(substream); 1420 runtime->status->suspended_state = runtime->status->state; 1421 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1422 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1423 wake_up(&runtime->sleep); 1424 wake_up(&runtime->tsleep); 1425 } 1426 1427 static const struct action_ops snd_pcm_action_suspend = { 1428 .pre_action = snd_pcm_pre_suspend, 1429 .do_action = snd_pcm_do_suspend, 1430 .post_action = snd_pcm_post_suspend 1431 }; 1432 1433 /** 1434 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1435 * @substream: the PCM substream 1436 * 1437 * After this call, all streams are changed to SUSPENDED state. 1438 * 1439 * Return: Zero if successful (or @substream is %NULL), or a negative error 1440 * code. 1441 */ 1442 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1443 { 1444 int err; 1445 unsigned long flags; 1446 1447 if (! substream) 1448 return 0; 1449 1450 snd_pcm_stream_lock_irqsave(substream, flags); 1451 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1452 snd_pcm_stream_unlock_irqrestore(substream, flags); 1453 return err; 1454 } 1455 EXPORT_SYMBOL(snd_pcm_suspend); 1456 1457 /** 1458 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1459 * @pcm: the PCM instance 1460 * 1461 * After this call, all streams are changed to SUSPENDED state. 1462 * 1463 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1464 */ 1465 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1466 { 1467 struct snd_pcm_substream *substream; 1468 int stream, err = 0; 1469 1470 if (! pcm) 1471 return 0; 1472 1473 for (stream = 0; stream < 2; stream++) { 1474 for (substream = pcm->streams[stream].substream; 1475 substream; substream = substream->next) { 1476 /* FIXME: the open/close code should lock this as well */ 1477 if (substream->runtime == NULL) 1478 continue; 1479 err = snd_pcm_suspend(substream); 1480 if (err < 0 && err != -EBUSY) 1481 return err; 1482 } 1483 } 1484 return 0; 1485 } 1486 EXPORT_SYMBOL(snd_pcm_suspend_all); 1487 1488 /* resume */ 1489 1490 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1491 { 1492 struct snd_pcm_runtime *runtime = substream->runtime; 1493 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1494 return -ENOSYS; 1495 runtime->trigger_master = substream; 1496 return 0; 1497 } 1498 1499 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1500 { 1501 struct snd_pcm_runtime *runtime = substream->runtime; 1502 if (runtime->trigger_master != substream) 1503 return 0; 1504 /* DMA not running previously? */ 1505 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1506 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1507 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1508 return 0; 1509 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1510 } 1511 1512 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1513 { 1514 if (substream->runtime->trigger_master == substream && 1515 snd_pcm_running(substream)) 1516 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1517 } 1518 1519 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1520 { 1521 struct snd_pcm_runtime *runtime = substream->runtime; 1522 snd_pcm_trigger_tstamp(substream); 1523 runtime->status->state = runtime->status->suspended_state; 1524 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1525 } 1526 1527 static const struct action_ops snd_pcm_action_resume = { 1528 .pre_action = snd_pcm_pre_resume, 1529 .do_action = snd_pcm_do_resume, 1530 .undo_action = snd_pcm_undo_resume, 1531 .post_action = snd_pcm_post_resume 1532 }; 1533 1534 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1535 { 1536 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1537 } 1538 1539 #else 1540 1541 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1542 { 1543 return -ENOSYS; 1544 } 1545 1546 #endif /* CONFIG_PM */ 1547 1548 /* 1549 * xrun ioctl 1550 * 1551 * Change the RUNNING stream(s) to XRUN state. 1552 */ 1553 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1554 { 1555 struct snd_pcm_runtime *runtime = substream->runtime; 1556 int result; 1557 1558 snd_pcm_stream_lock_irq(substream); 1559 switch (runtime->status->state) { 1560 case SNDRV_PCM_STATE_XRUN: 1561 result = 0; /* already there */ 1562 break; 1563 case SNDRV_PCM_STATE_RUNNING: 1564 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1565 break; 1566 default: 1567 result = -EBADFD; 1568 } 1569 snd_pcm_stream_unlock_irq(substream); 1570 return result; 1571 } 1572 1573 /* 1574 * reset ioctl 1575 */ 1576 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1577 { 1578 struct snd_pcm_runtime *runtime = substream->runtime; 1579 switch (runtime->status->state) { 1580 case SNDRV_PCM_STATE_RUNNING: 1581 case SNDRV_PCM_STATE_PREPARED: 1582 case SNDRV_PCM_STATE_PAUSED: 1583 case SNDRV_PCM_STATE_SUSPENDED: 1584 return 0; 1585 default: 1586 return -EBADFD; 1587 } 1588 } 1589 1590 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1591 { 1592 struct snd_pcm_runtime *runtime = substream->runtime; 1593 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1594 if (err < 0) 1595 return err; 1596 runtime->hw_ptr_base = 0; 1597 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1598 runtime->status->hw_ptr % runtime->period_size; 1599 runtime->silence_start = runtime->status->hw_ptr; 1600 runtime->silence_filled = 0; 1601 return 0; 1602 } 1603 1604 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1605 { 1606 struct snd_pcm_runtime *runtime = substream->runtime; 1607 runtime->control->appl_ptr = runtime->status->hw_ptr; 1608 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1609 runtime->silence_size > 0) 1610 snd_pcm_playback_silence(substream, ULONG_MAX); 1611 } 1612 1613 static const struct action_ops snd_pcm_action_reset = { 1614 .pre_action = snd_pcm_pre_reset, 1615 .do_action = snd_pcm_do_reset, 1616 .post_action = snd_pcm_post_reset 1617 }; 1618 1619 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1620 { 1621 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1622 } 1623 1624 /* 1625 * prepare ioctl 1626 */ 1627 /* we use the second argument for updating f_flags */ 1628 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1629 int f_flags) 1630 { 1631 struct snd_pcm_runtime *runtime = substream->runtime; 1632 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1633 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1634 return -EBADFD; 1635 if (snd_pcm_running(substream)) 1636 return -EBUSY; 1637 substream->f_flags = f_flags; 1638 return 0; 1639 } 1640 1641 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1642 { 1643 int err; 1644 err = substream->ops->prepare(substream); 1645 if (err < 0) 1646 return err; 1647 return snd_pcm_do_reset(substream, 0); 1648 } 1649 1650 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1651 { 1652 struct snd_pcm_runtime *runtime = substream->runtime; 1653 runtime->control->appl_ptr = runtime->status->hw_ptr; 1654 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1655 } 1656 1657 static const struct action_ops snd_pcm_action_prepare = { 1658 .pre_action = snd_pcm_pre_prepare, 1659 .do_action = snd_pcm_do_prepare, 1660 .post_action = snd_pcm_post_prepare 1661 }; 1662 1663 /** 1664 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1665 * @substream: the PCM substream instance 1666 * @file: file to refer f_flags 1667 * 1668 * Return: Zero if successful, or a negative error code. 1669 */ 1670 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1671 struct file *file) 1672 { 1673 int f_flags; 1674 1675 if (file) 1676 f_flags = file->f_flags; 1677 else 1678 f_flags = substream->f_flags; 1679 1680 snd_pcm_stream_lock_irq(substream); 1681 switch (substream->runtime->status->state) { 1682 case SNDRV_PCM_STATE_PAUSED: 1683 snd_pcm_pause(substream, 0); 1684 /* fallthru */ 1685 case SNDRV_PCM_STATE_SUSPENDED: 1686 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1687 break; 1688 } 1689 snd_pcm_stream_unlock_irq(substream); 1690 1691 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1692 substream, f_flags); 1693 } 1694 1695 /* 1696 * drain ioctl 1697 */ 1698 1699 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1700 { 1701 struct snd_pcm_runtime *runtime = substream->runtime; 1702 switch (runtime->status->state) { 1703 case SNDRV_PCM_STATE_OPEN: 1704 case SNDRV_PCM_STATE_DISCONNECTED: 1705 case SNDRV_PCM_STATE_SUSPENDED: 1706 return -EBADFD; 1707 } 1708 runtime->trigger_master = substream; 1709 return 0; 1710 } 1711 1712 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1713 { 1714 struct snd_pcm_runtime *runtime = substream->runtime; 1715 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1716 switch (runtime->status->state) { 1717 case SNDRV_PCM_STATE_PREPARED: 1718 /* start playback stream if possible */ 1719 if (! snd_pcm_playback_empty(substream)) { 1720 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1721 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1722 } else { 1723 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1724 } 1725 break; 1726 case SNDRV_PCM_STATE_RUNNING: 1727 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1728 break; 1729 case SNDRV_PCM_STATE_XRUN: 1730 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1731 break; 1732 default: 1733 break; 1734 } 1735 } else { 1736 /* stop running stream */ 1737 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1738 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1739 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1740 snd_pcm_do_stop(substream, new_state); 1741 snd_pcm_post_stop(substream, new_state); 1742 } 1743 } 1744 1745 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1746 runtime->trigger_master == substream && 1747 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1748 return substream->ops->trigger(substream, 1749 SNDRV_PCM_TRIGGER_DRAIN); 1750 1751 return 0; 1752 } 1753 1754 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1755 { 1756 } 1757 1758 static const struct action_ops snd_pcm_action_drain_init = { 1759 .pre_action = snd_pcm_pre_drain_init, 1760 .do_action = snd_pcm_do_drain_init, 1761 .post_action = snd_pcm_post_drain_init 1762 }; 1763 1764 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1765 1766 /* 1767 * Drain the stream(s). 1768 * When the substream is linked, sync until the draining of all playback streams 1769 * is finished. 1770 * After this call, all streams are supposed to be either SETUP or DRAINING 1771 * (capture only) state. 1772 */ 1773 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1774 struct file *file) 1775 { 1776 struct snd_card *card; 1777 struct snd_pcm_runtime *runtime; 1778 struct snd_pcm_substream *s; 1779 wait_queue_entry_t wait; 1780 int result = 0; 1781 int nonblock = 0; 1782 1783 card = substream->pcm->card; 1784 runtime = substream->runtime; 1785 1786 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1787 return -EBADFD; 1788 1789 if (file) { 1790 if (file->f_flags & O_NONBLOCK) 1791 nonblock = 1; 1792 } else if (substream->f_flags & O_NONBLOCK) 1793 nonblock = 1; 1794 1795 down_read(&snd_pcm_link_rwsem); 1796 snd_pcm_stream_lock_irq(substream); 1797 /* resume pause */ 1798 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1799 snd_pcm_pause(substream, 0); 1800 1801 /* pre-start/stop - all running streams are changed to DRAINING state */ 1802 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1803 if (result < 0) 1804 goto unlock; 1805 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1806 if (nonblock) { 1807 result = -EAGAIN; 1808 goto unlock; 1809 } 1810 1811 for (;;) { 1812 long tout; 1813 struct snd_pcm_runtime *to_check; 1814 if (signal_pending(current)) { 1815 result = -ERESTARTSYS; 1816 break; 1817 } 1818 /* find a substream to drain */ 1819 to_check = NULL; 1820 snd_pcm_group_for_each_entry(s, substream) { 1821 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1822 continue; 1823 runtime = s->runtime; 1824 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1825 to_check = runtime; 1826 break; 1827 } 1828 } 1829 if (!to_check) 1830 break; /* all drained */ 1831 init_waitqueue_entry(&wait, current); 1832 add_wait_queue(&to_check->sleep, &wait); 1833 snd_pcm_stream_unlock_irq(substream); 1834 up_read(&snd_pcm_link_rwsem); 1835 if (runtime->no_period_wakeup) 1836 tout = MAX_SCHEDULE_TIMEOUT; 1837 else { 1838 tout = 10; 1839 if (runtime->rate) { 1840 long t = runtime->period_size * 2 / runtime->rate; 1841 tout = max(t, tout); 1842 } 1843 tout = msecs_to_jiffies(tout * 1000); 1844 } 1845 tout = schedule_timeout_interruptible(tout); 1846 down_read(&snd_pcm_link_rwsem); 1847 snd_pcm_stream_lock_irq(substream); 1848 remove_wait_queue(&to_check->sleep, &wait); 1849 if (card->shutdown) { 1850 result = -ENODEV; 1851 break; 1852 } 1853 if (tout == 0) { 1854 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1855 result = -ESTRPIPE; 1856 else { 1857 dev_dbg(substream->pcm->card->dev, 1858 "playback drain error (DMA or IRQ trouble?)\n"); 1859 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1860 result = -EIO; 1861 } 1862 break; 1863 } 1864 } 1865 1866 unlock: 1867 snd_pcm_stream_unlock_irq(substream); 1868 up_read(&snd_pcm_link_rwsem); 1869 1870 return result; 1871 } 1872 1873 /* 1874 * drop ioctl 1875 * 1876 * Immediately put all linked substreams into SETUP state. 1877 */ 1878 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1879 { 1880 struct snd_pcm_runtime *runtime; 1881 int result = 0; 1882 1883 if (PCM_RUNTIME_CHECK(substream)) 1884 return -ENXIO; 1885 runtime = substream->runtime; 1886 1887 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1888 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1889 return -EBADFD; 1890 1891 snd_pcm_stream_lock_irq(substream); 1892 /* resume pause */ 1893 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1894 snd_pcm_pause(substream, 0); 1895 1896 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1897 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1898 snd_pcm_stream_unlock_irq(substream); 1899 1900 return result; 1901 } 1902 1903 1904 static bool is_pcm_file(struct file *file) 1905 { 1906 struct inode *inode = file_inode(file); 1907 unsigned int minor; 1908 1909 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1910 return false; 1911 minor = iminor(inode); 1912 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1913 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1914 } 1915 1916 /* 1917 * PCM link handling 1918 */ 1919 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1920 { 1921 int res = 0; 1922 struct snd_pcm_file *pcm_file; 1923 struct snd_pcm_substream *substream1; 1924 struct snd_pcm_group *group; 1925 struct fd f = fdget(fd); 1926 1927 if (!f.file) 1928 return -EBADFD; 1929 if (!is_pcm_file(f.file)) { 1930 res = -EBADFD; 1931 goto _badf; 1932 } 1933 pcm_file = f.file->private_data; 1934 substream1 = pcm_file->substream; 1935 group = kmalloc(sizeof(*group), GFP_KERNEL); 1936 if (!group) { 1937 res = -ENOMEM; 1938 goto _nolock; 1939 } 1940 down_write_nonblock(&snd_pcm_link_rwsem); 1941 write_lock_irq(&snd_pcm_link_rwlock); 1942 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1943 substream->runtime->status->state != substream1->runtime->status->state || 1944 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1945 res = -EBADFD; 1946 goto _end; 1947 } 1948 if (snd_pcm_stream_linked(substream1)) { 1949 res = -EALREADY; 1950 goto _end; 1951 } 1952 if (!snd_pcm_stream_linked(substream)) { 1953 substream->group = group; 1954 group = NULL; 1955 spin_lock_init(&substream->group->lock); 1956 mutex_init(&substream->group->mutex); 1957 INIT_LIST_HEAD(&substream->group->substreams); 1958 list_add_tail(&substream->link_list, &substream->group->substreams); 1959 substream->group->count = 1; 1960 } 1961 list_add_tail(&substream1->link_list, &substream->group->substreams); 1962 substream->group->count++; 1963 substream1->group = substream->group; 1964 _end: 1965 write_unlock_irq(&snd_pcm_link_rwlock); 1966 up_write(&snd_pcm_link_rwsem); 1967 _nolock: 1968 snd_card_unref(substream1->pcm->card); 1969 kfree(group); 1970 _badf: 1971 fdput(f); 1972 return res; 1973 } 1974 1975 static void relink_to_local(struct snd_pcm_substream *substream) 1976 { 1977 substream->group = &substream->self_group; 1978 INIT_LIST_HEAD(&substream->self_group.substreams); 1979 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1980 } 1981 1982 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1983 { 1984 struct snd_pcm_substream *s; 1985 int res = 0; 1986 1987 down_write_nonblock(&snd_pcm_link_rwsem); 1988 write_lock_irq(&snd_pcm_link_rwlock); 1989 if (!snd_pcm_stream_linked(substream)) { 1990 res = -EALREADY; 1991 goto _end; 1992 } 1993 list_del(&substream->link_list); 1994 substream->group->count--; 1995 if (substream->group->count == 1) { /* detach the last stream, too */ 1996 snd_pcm_group_for_each_entry(s, substream) { 1997 relink_to_local(s); 1998 break; 1999 } 2000 kfree(substream->group); 2001 } 2002 relink_to_local(substream); 2003 _end: 2004 write_unlock_irq(&snd_pcm_link_rwlock); 2005 up_write(&snd_pcm_link_rwsem); 2006 return res; 2007 } 2008 2009 /* 2010 * hw configurator 2011 */ 2012 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2013 struct snd_pcm_hw_rule *rule) 2014 { 2015 struct snd_interval t; 2016 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2017 hw_param_interval_c(params, rule->deps[1]), &t); 2018 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2019 } 2020 2021 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2022 struct snd_pcm_hw_rule *rule) 2023 { 2024 struct snd_interval t; 2025 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2026 hw_param_interval_c(params, rule->deps[1]), &t); 2027 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2028 } 2029 2030 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2031 struct snd_pcm_hw_rule *rule) 2032 { 2033 struct snd_interval t; 2034 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2035 hw_param_interval_c(params, rule->deps[1]), 2036 (unsigned long) rule->private, &t); 2037 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2038 } 2039 2040 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2041 struct snd_pcm_hw_rule *rule) 2042 { 2043 struct snd_interval t; 2044 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2045 (unsigned long) rule->private, 2046 hw_param_interval_c(params, rule->deps[1]), &t); 2047 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2048 } 2049 2050 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2051 struct snd_pcm_hw_rule *rule) 2052 { 2053 unsigned int k; 2054 const struct snd_interval *i = 2055 hw_param_interval_c(params, rule->deps[0]); 2056 struct snd_mask m; 2057 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2058 snd_mask_any(&m); 2059 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2060 int bits; 2061 if (! snd_mask_test(mask, k)) 2062 continue; 2063 bits = snd_pcm_format_physical_width(k); 2064 if (bits <= 0) 2065 continue; /* ignore invalid formats */ 2066 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2067 snd_mask_reset(&m, k); 2068 } 2069 return snd_mask_refine(mask, &m); 2070 } 2071 2072 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2073 struct snd_pcm_hw_rule *rule) 2074 { 2075 struct snd_interval t; 2076 unsigned int k; 2077 t.min = UINT_MAX; 2078 t.max = 0; 2079 t.openmin = 0; 2080 t.openmax = 0; 2081 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2082 int bits; 2083 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2084 continue; 2085 bits = snd_pcm_format_physical_width(k); 2086 if (bits <= 0) 2087 continue; /* ignore invalid formats */ 2088 if (t.min > (unsigned)bits) 2089 t.min = bits; 2090 if (t.max < (unsigned)bits) 2091 t.max = bits; 2092 } 2093 t.integer = 1; 2094 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2095 } 2096 2097 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2098 #error "Change this table" 2099 #endif 2100 2101 static const unsigned int rates[] = { 2102 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2103 48000, 64000, 88200, 96000, 176400, 192000 2104 }; 2105 2106 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2107 .count = ARRAY_SIZE(rates), 2108 .list = rates, 2109 }; 2110 2111 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2112 struct snd_pcm_hw_rule *rule) 2113 { 2114 struct snd_pcm_hardware *hw = rule->private; 2115 return snd_interval_list(hw_param_interval(params, rule->var), 2116 snd_pcm_known_rates.count, 2117 snd_pcm_known_rates.list, hw->rates); 2118 } 2119 2120 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2121 struct snd_pcm_hw_rule *rule) 2122 { 2123 struct snd_interval t; 2124 struct snd_pcm_substream *substream = rule->private; 2125 t.min = 0; 2126 t.max = substream->buffer_bytes_max; 2127 t.openmin = 0; 2128 t.openmax = 0; 2129 t.integer = 1; 2130 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2131 } 2132 2133 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2134 { 2135 struct snd_pcm_runtime *runtime = substream->runtime; 2136 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2137 int k, err; 2138 2139 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2140 snd_mask_any(constrs_mask(constrs, k)); 2141 } 2142 2143 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2144 snd_interval_any(constrs_interval(constrs, k)); 2145 } 2146 2147 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2148 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2149 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2150 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2151 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2152 2153 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2154 snd_pcm_hw_rule_format, NULL, 2155 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2156 if (err < 0) 2157 return err; 2158 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2159 snd_pcm_hw_rule_sample_bits, NULL, 2160 SNDRV_PCM_HW_PARAM_FORMAT, 2161 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2162 if (err < 0) 2163 return err; 2164 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2165 snd_pcm_hw_rule_div, NULL, 2166 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2167 if (err < 0) 2168 return err; 2169 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2170 snd_pcm_hw_rule_mul, NULL, 2171 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2172 if (err < 0) 2173 return err; 2174 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2175 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2176 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2177 if (err < 0) 2178 return err; 2179 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2180 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2181 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2182 if (err < 0) 2183 return err; 2184 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2185 snd_pcm_hw_rule_div, NULL, 2186 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2187 if (err < 0) 2188 return err; 2189 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2190 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2191 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2192 if (err < 0) 2193 return err; 2194 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2195 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2196 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2197 if (err < 0) 2198 return err; 2199 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2200 snd_pcm_hw_rule_div, NULL, 2201 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2202 if (err < 0) 2203 return err; 2204 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2205 snd_pcm_hw_rule_div, NULL, 2206 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2207 if (err < 0) 2208 return err; 2209 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2210 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2211 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2212 if (err < 0) 2213 return err; 2214 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2215 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2216 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2217 if (err < 0) 2218 return err; 2219 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2220 snd_pcm_hw_rule_mul, NULL, 2221 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2222 if (err < 0) 2223 return err; 2224 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2225 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2226 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2227 if (err < 0) 2228 return err; 2229 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2230 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2231 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2232 if (err < 0) 2233 return err; 2234 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2235 snd_pcm_hw_rule_muldivk, (void*) 8, 2236 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2237 if (err < 0) 2238 return err; 2239 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2240 snd_pcm_hw_rule_muldivk, (void*) 8, 2241 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2242 if (err < 0) 2243 return err; 2244 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2245 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2246 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2247 if (err < 0) 2248 return err; 2249 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2250 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2251 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2252 if (err < 0) 2253 return err; 2254 return 0; 2255 } 2256 2257 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2258 { 2259 struct snd_pcm_runtime *runtime = substream->runtime; 2260 struct snd_pcm_hardware *hw = &runtime->hw; 2261 int err; 2262 unsigned int mask = 0; 2263 2264 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2265 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2266 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2267 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2268 if (hw_support_mmap(substream)) { 2269 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2270 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2271 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2272 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2273 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2274 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2275 } 2276 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2277 if (err < 0) 2278 return err; 2279 2280 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2281 if (err < 0) 2282 return err; 2283 2284 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2285 if (err < 0) 2286 return err; 2287 2288 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2289 hw->channels_min, hw->channels_max); 2290 if (err < 0) 2291 return err; 2292 2293 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2294 hw->rate_min, hw->rate_max); 2295 if (err < 0) 2296 return err; 2297 2298 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2299 hw->period_bytes_min, hw->period_bytes_max); 2300 if (err < 0) 2301 return err; 2302 2303 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2304 hw->periods_min, hw->periods_max); 2305 if (err < 0) 2306 return err; 2307 2308 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2309 hw->period_bytes_min, hw->buffer_bytes_max); 2310 if (err < 0) 2311 return err; 2312 2313 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2314 snd_pcm_hw_rule_buffer_bytes_max, substream, 2315 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2316 if (err < 0) 2317 return err; 2318 2319 /* FIXME: remove */ 2320 if (runtime->dma_bytes) { 2321 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2322 if (err < 0) 2323 return err; 2324 } 2325 2326 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2327 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2328 snd_pcm_hw_rule_rate, hw, 2329 SNDRV_PCM_HW_PARAM_RATE, -1); 2330 if (err < 0) 2331 return err; 2332 } 2333 2334 /* FIXME: this belong to lowlevel */ 2335 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2336 2337 return 0; 2338 } 2339 2340 static void pcm_release_private(struct snd_pcm_substream *substream) 2341 { 2342 snd_pcm_unlink(substream); 2343 } 2344 2345 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2346 { 2347 substream->ref_count--; 2348 if (substream->ref_count > 0) 2349 return; 2350 2351 snd_pcm_drop(substream); 2352 if (substream->hw_opened) { 2353 if (substream->ops->hw_free && 2354 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2355 substream->ops->hw_free(substream); 2356 substream->ops->close(substream); 2357 substream->hw_opened = 0; 2358 } 2359 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2360 pm_qos_remove_request(&substream->latency_pm_qos_req); 2361 if (substream->pcm_release) { 2362 substream->pcm_release(substream); 2363 substream->pcm_release = NULL; 2364 } 2365 snd_pcm_detach_substream(substream); 2366 } 2367 EXPORT_SYMBOL(snd_pcm_release_substream); 2368 2369 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2370 struct file *file, 2371 struct snd_pcm_substream **rsubstream) 2372 { 2373 struct snd_pcm_substream *substream; 2374 int err; 2375 2376 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2377 if (err < 0) 2378 return err; 2379 if (substream->ref_count > 1) { 2380 *rsubstream = substream; 2381 return 0; 2382 } 2383 2384 err = snd_pcm_hw_constraints_init(substream); 2385 if (err < 0) { 2386 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2387 goto error; 2388 } 2389 2390 if ((err = substream->ops->open(substream)) < 0) 2391 goto error; 2392 2393 substream->hw_opened = 1; 2394 2395 err = snd_pcm_hw_constraints_complete(substream); 2396 if (err < 0) { 2397 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2398 goto error; 2399 } 2400 2401 *rsubstream = substream; 2402 return 0; 2403 2404 error: 2405 snd_pcm_release_substream(substream); 2406 return err; 2407 } 2408 EXPORT_SYMBOL(snd_pcm_open_substream); 2409 2410 static int snd_pcm_open_file(struct file *file, 2411 struct snd_pcm *pcm, 2412 int stream) 2413 { 2414 struct snd_pcm_file *pcm_file; 2415 struct snd_pcm_substream *substream; 2416 int err; 2417 2418 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2419 if (err < 0) 2420 return err; 2421 2422 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2423 if (pcm_file == NULL) { 2424 snd_pcm_release_substream(substream); 2425 return -ENOMEM; 2426 } 2427 pcm_file->substream = substream; 2428 if (substream->ref_count == 1) { 2429 substream->file = pcm_file; 2430 substream->pcm_release = pcm_release_private; 2431 } 2432 file->private_data = pcm_file; 2433 2434 return 0; 2435 } 2436 2437 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2438 { 2439 struct snd_pcm *pcm; 2440 int err = nonseekable_open(inode, file); 2441 if (err < 0) 2442 return err; 2443 pcm = snd_lookup_minor_data(iminor(inode), 2444 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2445 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2446 if (pcm) 2447 snd_card_unref(pcm->card); 2448 return err; 2449 } 2450 2451 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2452 { 2453 struct snd_pcm *pcm; 2454 int err = nonseekable_open(inode, file); 2455 if (err < 0) 2456 return err; 2457 pcm = snd_lookup_minor_data(iminor(inode), 2458 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2459 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2460 if (pcm) 2461 snd_card_unref(pcm->card); 2462 return err; 2463 } 2464 2465 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2466 { 2467 int err; 2468 wait_queue_entry_t wait; 2469 2470 if (pcm == NULL) { 2471 err = -ENODEV; 2472 goto __error1; 2473 } 2474 err = snd_card_file_add(pcm->card, file); 2475 if (err < 0) 2476 goto __error1; 2477 if (!try_module_get(pcm->card->module)) { 2478 err = -EFAULT; 2479 goto __error2; 2480 } 2481 init_waitqueue_entry(&wait, current); 2482 add_wait_queue(&pcm->open_wait, &wait); 2483 mutex_lock(&pcm->open_mutex); 2484 while (1) { 2485 err = snd_pcm_open_file(file, pcm, stream); 2486 if (err >= 0) 2487 break; 2488 if (err == -EAGAIN) { 2489 if (file->f_flags & O_NONBLOCK) { 2490 err = -EBUSY; 2491 break; 2492 } 2493 } else 2494 break; 2495 set_current_state(TASK_INTERRUPTIBLE); 2496 mutex_unlock(&pcm->open_mutex); 2497 schedule(); 2498 mutex_lock(&pcm->open_mutex); 2499 if (pcm->card->shutdown) { 2500 err = -ENODEV; 2501 break; 2502 } 2503 if (signal_pending(current)) { 2504 err = -ERESTARTSYS; 2505 break; 2506 } 2507 } 2508 remove_wait_queue(&pcm->open_wait, &wait); 2509 mutex_unlock(&pcm->open_mutex); 2510 if (err < 0) 2511 goto __error; 2512 return err; 2513 2514 __error: 2515 module_put(pcm->card->module); 2516 __error2: 2517 snd_card_file_remove(pcm->card, file); 2518 __error1: 2519 return err; 2520 } 2521 2522 static int snd_pcm_release(struct inode *inode, struct file *file) 2523 { 2524 struct snd_pcm *pcm; 2525 struct snd_pcm_substream *substream; 2526 struct snd_pcm_file *pcm_file; 2527 2528 pcm_file = file->private_data; 2529 substream = pcm_file->substream; 2530 if (snd_BUG_ON(!substream)) 2531 return -ENXIO; 2532 pcm = substream->pcm; 2533 mutex_lock(&pcm->open_mutex); 2534 snd_pcm_release_substream(substream); 2535 kfree(pcm_file); 2536 mutex_unlock(&pcm->open_mutex); 2537 wake_up(&pcm->open_wait); 2538 module_put(pcm->card->module); 2539 snd_card_file_remove(pcm->card, file); 2540 return 0; 2541 } 2542 2543 /* check and update PCM state; return 0 or a negative error 2544 * call this inside PCM lock 2545 */ 2546 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2547 { 2548 switch (substream->runtime->status->state) { 2549 case SNDRV_PCM_STATE_DRAINING: 2550 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2551 return -EBADFD; 2552 /* Fall through */ 2553 case SNDRV_PCM_STATE_RUNNING: 2554 return snd_pcm_update_hw_ptr(substream); 2555 case SNDRV_PCM_STATE_PREPARED: 2556 case SNDRV_PCM_STATE_PAUSED: 2557 return 0; 2558 case SNDRV_PCM_STATE_SUSPENDED: 2559 return -ESTRPIPE; 2560 case SNDRV_PCM_STATE_XRUN: 2561 return -EPIPE; 2562 default: 2563 return -EBADFD; 2564 } 2565 } 2566 2567 /* increase the appl_ptr; returns the processed frames or a negative error */ 2568 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2569 snd_pcm_uframes_t frames, 2570 snd_pcm_sframes_t avail) 2571 { 2572 struct snd_pcm_runtime *runtime = substream->runtime; 2573 snd_pcm_sframes_t appl_ptr; 2574 int ret; 2575 2576 if (avail <= 0) 2577 return 0; 2578 if (frames > (snd_pcm_uframes_t)avail) 2579 frames = avail; 2580 appl_ptr = runtime->control->appl_ptr + frames; 2581 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2582 appl_ptr -= runtime->boundary; 2583 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2584 return ret < 0 ? ret : frames; 2585 } 2586 2587 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2588 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2589 snd_pcm_uframes_t frames, 2590 snd_pcm_sframes_t avail) 2591 { 2592 struct snd_pcm_runtime *runtime = substream->runtime; 2593 snd_pcm_sframes_t appl_ptr; 2594 int ret; 2595 2596 if (avail <= 0) 2597 return 0; 2598 if (frames > (snd_pcm_uframes_t)avail) 2599 frames = avail; 2600 appl_ptr = runtime->control->appl_ptr - frames; 2601 if (appl_ptr < 0) 2602 appl_ptr += runtime->boundary; 2603 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2604 /* NOTE: we return zero for errors because PulseAudio gets depressed 2605 * upon receiving an error from rewind ioctl and stops processing 2606 * any longer. Returning zero means that no rewind is done, so 2607 * it's not absolutely wrong to answer like that. 2608 */ 2609 return ret < 0 ? 0 : frames; 2610 } 2611 2612 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2613 snd_pcm_uframes_t frames) 2614 { 2615 snd_pcm_sframes_t ret; 2616 2617 if (frames == 0) 2618 return 0; 2619 2620 snd_pcm_stream_lock_irq(substream); 2621 ret = do_pcm_hwsync(substream); 2622 if (!ret) 2623 ret = rewind_appl_ptr(substream, frames, 2624 snd_pcm_hw_avail(substream)); 2625 snd_pcm_stream_unlock_irq(substream); 2626 return ret; 2627 } 2628 2629 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2630 snd_pcm_uframes_t frames) 2631 { 2632 snd_pcm_sframes_t ret; 2633 2634 if (frames == 0) 2635 return 0; 2636 2637 snd_pcm_stream_lock_irq(substream); 2638 ret = do_pcm_hwsync(substream); 2639 if (!ret) 2640 ret = forward_appl_ptr(substream, frames, 2641 snd_pcm_avail(substream)); 2642 snd_pcm_stream_unlock_irq(substream); 2643 return ret; 2644 } 2645 2646 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2647 { 2648 int err; 2649 2650 snd_pcm_stream_lock_irq(substream); 2651 err = do_pcm_hwsync(substream); 2652 snd_pcm_stream_unlock_irq(substream); 2653 return err; 2654 } 2655 2656 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2657 { 2658 struct snd_pcm_runtime *runtime = substream->runtime; 2659 int err; 2660 snd_pcm_sframes_t n = 0; 2661 2662 snd_pcm_stream_lock_irq(substream); 2663 err = do_pcm_hwsync(substream); 2664 if (!err) { 2665 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2666 n = snd_pcm_playback_hw_avail(runtime); 2667 else 2668 n = snd_pcm_capture_avail(runtime); 2669 n += runtime->delay; 2670 } 2671 snd_pcm_stream_unlock_irq(substream); 2672 return err < 0 ? err : n; 2673 } 2674 2675 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2676 struct snd_pcm_sync_ptr __user *_sync_ptr) 2677 { 2678 struct snd_pcm_runtime *runtime = substream->runtime; 2679 struct snd_pcm_sync_ptr sync_ptr; 2680 volatile struct snd_pcm_mmap_status *status; 2681 volatile struct snd_pcm_mmap_control *control; 2682 int err; 2683 2684 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2685 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2686 return -EFAULT; 2687 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2688 return -EFAULT; 2689 status = runtime->status; 2690 control = runtime->control; 2691 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2692 err = snd_pcm_hwsync(substream); 2693 if (err < 0) 2694 return err; 2695 } 2696 snd_pcm_stream_lock_irq(substream); 2697 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2698 err = pcm_lib_apply_appl_ptr(substream, 2699 sync_ptr.c.control.appl_ptr); 2700 if (err < 0) { 2701 snd_pcm_stream_unlock_irq(substream); 2702 return err; 2703 } 2704 } else { 2705 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2706 } 2707 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2708 control->avail_min = sync_ptr.c.control.avail_min; 2709 else 2710 sync_ptr.c.control.avail_min = control->avail_min; 2711 sync_ptr.s.status.state = status->state; 2712 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2713 sync_ptr.s.status.tstamp = status->tstamp; 2714 sync_ptr.s.status.suspended_state = status->suspended_state; 2715 snd_pcm_stream_unlock_irq(substream); 2716 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2717 return -EFAULT; 2718 return 0; 2719 } 2720 2721 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2722 { 2723 struct snd_pcm_runtime *runtime = substream->runtime; 2724 int arg; 2725 2726 if (get_user(arg, _arg)) 2727 return -EFAULT; 2728 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2729 return -EINVAL; 2730 runtime->tstamp_type = arg; 2731 return 0; 2732 } 2733 2734 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2735 struct snd_xferi __user *_xferi) 2736 { 2737 struct snd_xferi xferi; 2738 struct snd_pcm_runtime *runtime = substream->runtime; 2739 snd_pcm_sframes_t result; 2740 2741 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2742 return -EBADFD; 2743 if (put_user(0, &_xferi->result)) 2744 return -EFAULT; 2745 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2746 return -EFAULT; 2747 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2748 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2749 else 2750 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2751 __put_user(result, &_xferi->result); 2752 return result < 0 ? result : 0; 2753 } 2754 2755 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2756 struct snd_xfern __user *_xfern) 2757 { 2758 struct snd_xfern xfern; 2759 struct snd_pcm_runtime *runtime = substream->runtime; 2760 void *bufs; 2761 snd_pcm_sframes_t result; 2762 2763 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2764 return -EBADFD; 2765 if (runtime->channels > 128) 2766 return -EINVAL; 2767 if (put_user(0, &_xfern->result)) 2768 return -EFAULT; 2769 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2770 return -EFAULT; 2771 2772 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2773 if (IS_ERR(bufs)) 2774 return PTR_ERR(bufs); 2775 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2776 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2777 else 2778 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2779 kfree(bufs); 2780 __put_user(result, &_xfern->result); 2781 return result < 0 ? result : 0; 2782 } 2783 2784 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2785 snd_pcm_uframes_t __user *_frames) 2786 { 2787 snd_pcm_uframes_t frames; 2788 snd_pcm_sframes_t result; 2789 2790 if (get_user(frames, _frames)) 2791 return -EFAULT; 2792 if (put_user(0, _frames)) 2793 return -EFAULT; 2794 result = snd_pcm_rewind(substream, frames); 2795 __put_user(result, _frames); 2796 return result < 0 ? result : 0; 2797 } 2798 2799 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2800 snd_pcm_uframes_t __user *_frames) 2801 { 2802 snd_pcm_uframes_t frames; 2803 snd_pcm_sframes_t result; 2804 2805 if (get_user(frames, _frames)) 2806 return -EFAULT; 2807 if (put_user(0, _frames)) 2808 return -EFAULT; 2809 result = snd_pcm_forward(substream, frames); 2810 __put_user(result, _frames); 2811 return result < 0 ? result : 0; 2812 } 2813 2814 static int snd_pcm_common_ioctl(struct file *file, 2815 struct snd_pcm_substream *substream, 2816 unsigned int cmd, void __user *arg) 2817 { 2818 struct snd_pcm_file *pcm_file = file->private_data; 2819 int res; 2820 2821 if (PCM_RUNTIME_CHECK(substream)) 2822 return -ENXIO; 2823 2824 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2825 if (res < 0) 2826 return res; 2827 2828 switch (cmd) { 2829 case SNDRV_PCM_IOCTL_PVERSION: 2830 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2831 case SNDRV_PCM_IOCTL_INFO: 2832 return snd_pcm_info_user(substream, arg); 2833 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2834 return 0; 2835 case SNDRV_PCM_IOCTL_TTSTAMP: 2836 return snd_pcm_tstamp(substream, arg); 2837 case SNDRV_PCM_IOCTL_USER_PVERSION: 2838 if (get_user(pcm_file->user_pversion, 2839 (unsigned int __user *)arg)) 2840 return -EFAULT; 2841 return 0; 2842 case SNDRV_PCM_IOCTL_HW_REFINE: 2843 return snd_pcm_hw_refine_user(substream, arg); 2844 case SNDRV_PCM_IOCTL_HW_PARAMS: 2845 return snd_pcm_hw_params_user(substream, arg); 2846 case SNDRV_PCM_IOCTL_HW_FREE: 2847 return snd_pcm_hw_free(substream); 2848 case SNDRV_PCM_IOCTL_SW_PARAMS: 2849 return snd_pcm_sw_params_user(substream, arg); 2850 case SNDRV_PCM_IOCTL_STATUS: 2851 return snd_pcm_status_user(substream, arg, false); 2852 case SNDRV_PCM_IOCTL_STATUS_EXT: 2853 return snd_pcm_status_user(substream, arg, true); 2854 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2855 return snd_pcm_channel_info_user(substream, arg); 2856 case SNDRV_PCM_IOCTL_PREPARE: 2857 return snd_pcm_prepare(substream, file); 2858 case SNDRV_PCM_IOCTL_RESET: 2859 return snd_pcm_reset(substream); 2860 case SNDRV_PCM_IOCTL_START: 2861 return snd_pcm_start_lock_irq(substream); 2862 case SNDRV_PCM_IOCTL_LINK: 2863 return snd_pcm_link(substream, (int)(unsigned long) arg); 2864 case SNDRV_PCM_IOCTL_UNLINK: 2865 return snd_pcm_unlink(substream); 2866 case SNDRV_PCM_IOCTL_RESUME: 2867 return snd_pcm_resume(substream); 2868 case SNDRV_PCM_IOCTL_XRUN: 2869 return snd_pcm_xrun(substream); 2870 case SNDRV_PCM_IOCTL_HWSYNC: 2871 return snd_pcm_hwsync(substream); 2872 case SNDRV_PCM_IOCTL_DELAY: 2873 { 2874 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2875 snd_pcm_sframes_t __user *res = arg; 2876 2877 if (delay < 0) 2878 return delay; 2879 if (put_user(delay, res)) 2880 return -EFAULT; 2881 return 0; 2882 } 2883 case SNDRV_PCM_IOCTL_SYNC_PTR: 2884 return snd_pcm_sync_ptr(substream, arg); 2885 #ifdef CONFIG_SND_SUPPORT_OLD_API 2886 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2887 return snd_pcm_hw_refine_old_user(substream, arg); 2888 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2889 return snd_pcm_hw_params_old_user(substream, arg); 2890 #endif 2891 case SNDRV_PCM_IOCTL_DRAIN: 2892 return snd_pcm_drain(substream, file); 2893 case SNDRV_PCM_IOCTL_DROP: 2894 return snd_pcm_drop(substream); 2895 case SNDRV_PCM_IOCTL_PAUSE: 2896 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2897 substream, 2898 (int)(unsigned long)arg); 2899 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2900 case SNDRV_PCM_IOCTL_READI_FRAMES: 2901 return snd_pcm_xferi_frames_ioctl(substream, arg); 2902 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2903 case SNDRV_PCM_IOCTL_READN_FRAMES: 2904 return snd_pcm_xfern_frames_ioctl(substream, arg); 2905 case SNDRV_PCM_IOCTL_REWIND: 2906 return snd_pcm_rewind_ioctl(substream, arg); 2907 case SNDRV_PCM_IOCTL_FORWARD: 2908 return snd_pcm_forward_ioctl(substream, arg); 2909 } 2910 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2911 return -ENOTTY; 2912 } 2913 2914 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2915 unsigned long arg) 2916 { 2917 struct snd_pcm_file *pcm_file; 2918 2919 pcm_file = file->private_data; 2920 2921 if (((cmd >> 8) & 0xff) != 'A') 2922 return -ENOTTY; 2923 2924 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2925 (void __user *)arg); 2926 } 2927 2928 /** 2929 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2930 * @substream: PCM substream 2931 * @cmd: IOCTL cmd 2932 * @arg: IOCTL argument 2933 * 2934 * The function is provided primarily for OSS layer and USB gadget drivers, 2935 * and it allows only the limited set of ioctls (hw_params, sw_params, 2936 * prepare, start, drain, drop, forward). 2937 */ 2938 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2939 unsigned int cmd, void *arg) 2940 { 2941 snd_pcm_uframes_t *frames = arg; 2942 snd_pcm_sframes_t result; 2943 2944 switch (cmd) { 2945 case SNDRV_PCM_IOCTL_FORWARD: 2946 { 2947 /* provided only for OSS; capture-only and no value returned */ 2948 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 2949 return -EINVAL; 2950 result = snd_pcm_forward(substream, *frames); 2951 return result < 0 ? result : 0; 2952 } 2953 case SNDRV_PCM_IOCTL_HW_PARAMS: 2954 return snd_pcm_hw_params(substream, arg); 2955 case SNDRV_PCM_IOCTL_SW_PARAMS: 2956 return snd_pcm_sw_params(substream, arg); 2957 case SNDRV_PCM_IOCTL_PREPARE: 2958 return snd_pcm_prepare(substream, NULL); 2959 case SNDRV_PCM_IOCTL_START: 2960 return snd_pcm_start_lock_irq(substream); 2961 case SNDRV_PCM_IOCTL_DRAIN: 2962 return snd_pcm_drain(substream, NULL); 2963 case SNDRV_PCM_IOCTL_DROP: 2964 return snd_pcm_drop(substream); 2965 case SNDRV_PCM_IOCTL_DELAY: 2966 { 2967 result = snd_pcm_delay(substream); 2968 if (result < 0) 2969 return result; 2970 *frames = result; 2971 return 0; 2972 } 2973 default: 2974 return -EINVAL; 2975 } 2976 } 2977 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2978 2979 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2980 loff_t * offset) 2981 { 2982 struct snd_pcm_file *pcm_file; 2983 struct snd_pcm_substream *substream; 2984 struct snd_pcm_runtime *runtime; 2985 snd_pcm_sframes_t result; 2986 2987 pcm_file = file->private_data; 2988 substream = pcm_file->substream; 2989 if (PCM_RUNTIME_CHECK(substream)) 2990 return -ENXIO; 2991 runtime = substream->runtime; 2992 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2993 return -EBADFD; 2994 if (!frame_aligned(runtime, count)) 2995 return -EINVAL; 2996 count = bytes_to_frames(runtime, count); 2997 result = snd_pcm_lib_read(substream, buf, count); 2998 if (result > 0) 2999 result = frames_to_bytes(runtime, result); 3000 return result; 3001 } 3002 3003 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3004 size_t count, loff_t * offset) 3005 { 3006 struct snd_pcm_file *pcm_file; 3007 struct snd_pcm_substream *substream; 3008 struct snd_pcm_runtime *runtime; 3009 snd_pcm_sframes_t result; 3010 3011 pcm_file = file->private_data; 3012 substream = pcm_file->substream; 3013 if (PCM_RUNTIME_CHECK(substream)) 3014 return -ENXIO; 3015 runtime = substream->runtime; 3016 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3017 return -EBADFD; 3018 if (!frame_aligned(runtime, count)) 3019 return -EINVAL; 3020 count = bytes_to_frames(runtime, count); 3021 result = snd_pcm_lib_write(substream, buf, count); 3022 if (result > 0) 3023 result = frames_to_bytes(runtime, result); 3024 return result; 3025 } 3026 3027 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3028 { 3029 struct snd_pcm_file *pcm_file; 3030 struct snd_pcm_substream *substream; 3031 struct snd_pcm_runtime *runtime; 3032 snd_pcm_sframes_t result; 3033 unsigned long i; 3034 void __user **bufs; 3035 snd_pcm_uframes_t frames; 3036 3037 pcm_file = iocb->ki_filp->private_data; 3038 substream = pcm_file->substream; 3039 if (PCM_RUNTIME_CHECK(substream)) 3040 return -ENXIO; 3041 runtime = substream->runtime; 3042 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3043 return -EBADFD; 3044 if (!iter_is_iovec(to)) 3045 return -EINVAL; 3046 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3047 return -EINVAL; 3048 if (!frame_aligned(runtime, to->iov->iov_len)) 3049 return -EINVAL; 3050 frames = bytes_to_samples(runtime, to->iov->iov_len); 3051 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3052 if (bufs == NULL) 3053 return -ENOMEM; 3054 for (i = 0; i < to->nr_segs; ++i) 3055 bufs[i] = to->iov[i].iov_base; 3056 result = snd_pcm_lib_readv(substream, bufs, frames); 3057 if (result > 0) 3058 result = frames_to_bytes(runtime, result); 3059 kfree(bufs); 3060 return result; 3061 } 3062 3063 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3064 { 3065 struct snd_pcm_file *pcm_file; 3066 struct snd_pcm_substream *substream; 3067 struct snd_pcm_runtime *runtime; 3068 snd_pcm_sframes_t result; 3069 unsigned long i; 3070 void __user **bufs; 3071 snd_pcm_uframes_t frames; 3072 3073 pcm_file = iocb->ki_filp->private_data; 3074 substream = pcm_file->substream; 3075 if (PCM_RUNTIME_CHECK(substream)) 3076 return -ENXIO; 3077 runtime = substream->runtime; 3078 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3079 return -EBADFD; 3080 if (!iter_is_iovec(from)) 3081 return -EINVAL; 3082 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3083 !frame_aligned(runtime, from->iov->iov_len)) 3084 return -EINVAL; 3085 frames = bytes_to_samples(runtime, from->iov->iov_len); 3086 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3087 if (bufs == NULL) 3088 return -ENOMEM; 3089 for (i = 0; i < from->nr_segs; ++i) 3090 bufs[i] = from->iov[i].iov_base; 3091 result = snd_pcm_lib_writev(substream, bufs, frames); 3092 if (result > 0) 3093 result = frames_to_bytes(runtime, result); 3094 kfree(bufs); 3095 return result; 3096 } 3097 3098 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3099 { 3100 struct snd_pcm_file *pcm_file; 3101 struct snd_pcm_substream *substream; 3102 struct snd_pcm_runtime *runtime; 3103 __poll_t mask, ok; 3104 snd_pcm_uframes_t avail; 3105 3106 pcm_file = file->private_data; 3107 3108 substream = pcm_file->substream; 3109 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3110 ok = EPOLLOUT | EPOLLWRNORM; 3111 else 3112 ok = EPOLLIN | EPOLLRDNORM; 3113 if (PCM_RUNTIME_CHECK(substream)) 3114 return ok | EPOLLERR; 3115 3116 runtime = substream->runtime; 3117 poll_wait(file, &runtime->sleep, wait); 3118 3119 mask = 0; 3120 snd_pcm_stream_lock_irq(substream); 3121 avail = snd_pcm_avail(substream); 3122 switch (runtime->status->state) { 3123 case SNDRV_PCM_STATE_RUNNING: 3124 case SNDRV_PCM_STATE_PREPARED: 3125 case SNDRV_PCM_STATE_PAUSED: 3126 if (avail >= runtime->control->avail_min) 3127 mask = ok; 3128 break; 3129 case SNDRV_PCM_STATE_DRAINING: 3130 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3131 mask = ok; 3132 if (!avail) 3133 mask |= EPOLLERR; 3134 } 3135 break; 3136 default: 3137 mask = ok | EPOLLERR; 3138 break; 3139 } 3140 snd_pcm_stream_unlock_irq(substream); 3141 return mask; 3142 } 3143 3144 /* 3145 * mmap support 3146 */ 3147 3148 /* 3149 * Only on coherent architectures, we can mmap the status and the control records 3150 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3151 */ 3152 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3153 /* 3154 * mmap status record 3155 */ 3156 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3157 { 3158 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3159 struct snd_pcm_runtime *runtime; 3160 3161 if (substream == NULL) 3162 return VM_FAULT_SIGBUS; 3163 runtime = substream->runtime; 3164 vmf->page = virt_to_page(runtime->status); 3165 get_page(vmf->page); 3166 return 0; 3167 } 3168 3169 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3170 { 3171 .fault = snd_pcm_mmap_status_fault, 3172 }; 3173 3174 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3175 struct vm_area_struct *area) 3176 { 3177 long size; 3178 if (!(area->vm_flags & VM_READ)) 3179 return -EINVAL; 3180 size = area->vm_end - area->vm_start; 3181 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3182 return -EINVAL; 3183 area->vm_ops = &snd_pcm_vm_ops_status; 3184 area->vm_private_data = substream; 3185 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3186 return 0; 3187 } 3188 3189 /* 3190 * mmap control record 3191 */ 3192 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3193 { 3194 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3195 struct snd_pcm_runtime *runtime; 3196 3197 if (substream == NULL) 3198 return VM_FAULT_SIGBUS; 3199 runtime = substream->runtime; 3200 vmf->page = virt_to_page(runtime->control); 3201 get_page(vmf->page); 3202 return 0; 3203 } 3204 3205 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3206 { 3207 .fault = snd_pcm_mmap_control_fault, 3208 }; 3209 3210 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3211 struct vm_area_struct *area) 3212 { 3213 long size; 3214 if (!(area->vm_flags & VM_READ)) 3215 return -EINVAL; 3216 size = area->vm_end - area->vm_start; 3217 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3218 return -EINVAL; 3219 area->vm_ops = &snd_pcm_vm_ops_control; 3220 area->vm_private_data = substream; 3221 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3222 return 0; 3223 } 3224 3225 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3226 { 3227 if (pcm_file->no_compat_mmap) 3228 return false; 3229 /* See pcm_control_mmap_allowed() below. 3230 * Since older alsa-lib requires both status and control mmaps to be 3231 * coupled, we have to disable the status mmap for old alsa-lib, too. 3232 */ 3233 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3234 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3235 return false; 3236 return true; 3237 } 3238 3239 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3240 { 3241 if (pcm_file->no_compat_mmap) 3242 return false; 3243 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3244 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3245 * thus it effectively assures the manual update of appl_ptr. 3246 */ 3247 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3248 return false; 3249 return true; 3250 } 3251 3252 #else /* ! coherent mmap */ 3253 /* 3254 * don't support mmap for status and control records. 3255 */ 3256 #define pcm_status_mmap_allowed(pcm_file) false 3257 #define pcm_control_mmap_allowed(pcm_file) false 3258 3259 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3260 struct vm_area_struct *area) 3261 { 3262 return -ENXIO; 3263 } 3264 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3265 struct vm_area_struct *area) 3266 { 3267 return -ENXIO; 3268 } 3269 #endif /* coherent mmap */ 3270 3271 static inline struct page * 3272 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3273 { 3274 void *vaddr = substream->runtime->dma_area + ofs; 3275 return virt_to_page(vaddr); 3276 } 3277 3278 /* 3279 * fault callback for mmapping a RAM page 3280 */ 3281 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3282 { 3283 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3284 struct snd_pcm_runtime *runtime; 3285 unsigned long offset; 3286 struct page * page; 3287 size_t dma_bytes; 3288 3289 if (substream == NULL) 3290 return VM_FAULT_SIGBUS; 3291 runtime = substream->runtime; 3292 offset = vmf->pgoff << PAGE_SHIFT; 3293 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3294 if (offset > dma_bytes - PAGE_SIZE) 3295 return VM_FAULT_SIGBUS; 3296 if (substream->ops->page) 3297 page = substream->ops->page(substream, offset); 3298 else 3299 page = snd_pcm_default_page_ops(substream, offset); 3300 if (!page) 3301 return VM_FAULT_SIGBUS; 3302 get_page(page); 3303 vmf->page = page; 3304 return 0; 3305 } 3306 3307 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3308 .open = snd_pcm_mmap_data_open, 3309 .close = snd_pcm_mmap_data_close, 3310 }; 3311 3312 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3313 .open = snd_pcm_mmap_data_open, 3314 .close = snd_pcm_mmap_data_close, 3315 .fault = snd_pcm_mmap_data_fault, 3316 }; 3317 3318 /* 3319 * mmap the DMA buffer on RAM 3320 */ 3321 3322 /** 3323 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3324 * @substream: PCM substream 3325 * @area: VMA 3326 * 3327 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3328 * this function is invoked implicitly. 3329 */ 3330 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3331 struct vm_area_struct *area) 3332 { 3333 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3334 #ifdef CONFIG_GENERIC_ALLOCATOR 3335 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3336 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3337 return remap_pfn_range(area, area->vm_start, 3338 substream->dma_buffer.addr >> PAGE_SHIFT, 3339 area->vm_end - area->vm_start, area->vm_page_prot); 3340 } 3341 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3342 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3343 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3344 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3345 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3346 area, 3347 substream->runtime->dma_area, 3348 substream->runtime->dma_addr, 3349 substream->runtime->dma_bytes); 3350 #endif /* CONFIG_X86 */ 3351 /* mmap with fault handler */ 3352 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3353 return 0; 3354 } 3355 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3356 3357 /* 3358 * mmap the DMA buffer on I/O memory area 3359 */ 3360 #if SNDRV_PCM_INFO_MMAP_IOMEM 3361 /** 3362 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3363 * @substream: PCM substream 3364 * @area: VMA 3365 * 3366 * When your hardware uses the iomapped pages as the hardware buffer and 3367 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3368 * is supposed to work only on limited architectures. 3369 */ 3370 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3371 struct vm_area_struct *area) 3372 { 3373 struct snd_pcm_runtime *runtime = substream->runtime; 3374 3375 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3376 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3377 } 3378 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3379 #endif /* SNDRV_PCM_INFO_MMAP */ 3380 3381 /* 3382 * mmap DMA buffer 3383 */ 3384 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3385 struct vm_area_struct *area) 3386 { 3387 struct snd_pcm_runtime *runtime; 3388 long size; 3389 unsigned long offset; 3390 size_t dma_bytes; 3391 int err; 3392 3393 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3394 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3395 return -EINVAL; 3396 } else { 3397 if (!(area->vm_flags & VM_READ)) 3398 return -EINVAL; 3399 } 3400 runtime = substream->runtime; 3401 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3402 return -EBADFD; 3403 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3404 return -ENXIO; 3405 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3406 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3407 return -EINVAL; 3408 size = area->vm_end - area->vm_start; 3409 offset = area->vm_pgoff << PAGE_SHIFT; 3410 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3411 if ((size_t)size > dma_bytes) 3412 return -EINVAL; 3413 if (offset > dma_bytes - size) 3414 return -EINVAL; 3415 3416 area->vm_ops = &snd_pcm_vm_ops_data; 3417 area->vm_private_data = substream; 3418 if (substream->ops->mmap) 3419 err = substream->ops->mmap(substream, area); 3420 else 3421 err = snd_pcm_lib_default_mmap(substream, area); 3422 if (!err) 3423 atomic_inc(&substream->mmap_count); 3424 return err; 3425 } 3426 EXPORT_SYMBOL(snd_pcm_mmap_data); 3427 3428 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3429 { 3430 struct snd_pcm_file * pcm_file; 3431 struct snd_pcm_substream *substream; 3432 unsigned long offset; 3433 3434 pcm_file = file->private_data; 3435 substream = pcm_file->substream; 3436 if (PCM_RUNTIME_CHECK(substream)) 3437 return -ENXIO; 3438 3439 offset = area->vm_pgoff << PAGE_SHIFT; 3440 switch (offset) { 3441 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3442 if (!pcm_status_mmap_allowed(pcm_file)) 3443 return -ENXIO; 3444 return snd_pcm_mmap_status(substream, file, area); 3445 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3446 if (!pcm_control_mmap_allowed(pcm_file)) 3447 return -ENXIO; 3448 return snd_pcm_mmap_control(substream, file, area); 3449 default: 3450 return snd_pcm_mmap_data(substream, file, area); 3451 } 3452 return 0; 3453 } 3454 3455 static int snd_pcm_fasync(int fd, struct file * file, int on) 3456 { 3457 struct snd_pcm_file * pcm_file; 3458 struct snd_pcm_substream *substream; 3459 struct snd_pcm_runtime *runtime; 3460 3461 pcm_file = file->private_data; 3462 substream = pcm_file->substream; 3463 if (PCM_RUNTIME_CHECK(substream)) 3464 return -ENXIO; 3465 runtime = substream->runtime; 3466 return fasync_helper(fd, file, on, &runtime->fasync); 3467 } 3468 3469 /* 3470 * ioctl32 compat 3471 */ 3472 #ifdef CONFIG_COMPAT 3473 #include "pcm_compat.c" 3474 #else 3475 #define snd_pcm_ioctl_compat NULL 3476 #endif 3477 3478 /* 3479 * To be removed helpers to keep binary compatibility 3480 */ 3481 3482 #ifdef CONFIG_SND_SUPPORT_OLD_API 3483 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3484 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3485 3486 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3487 struct snd_pcm_hw_params_old *oparams) 3488 { 3489 unsigned int i; 3490 3491 memset(params, 0, sizeof(*params)); 3492 params->flags = oparams->flags; 3493 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3494 params->masks[i].bits[0] = oparams->masks[i]; 3495 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3496 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3497 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3498 params->info = oparams->info; 3499 params->msbits = oparams->msbits; 3500 params->rate_num = oparams->rate_num; 3501 params->rate_den = oparams->rate_den; 3502 params->fifo_size = oparams->fifo_size; 3503 } 3504 3505 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3506 struct snd_pcm_hw_params *params) 3507 { 3508 unsigned int i; 3509 3510 memset(oparams, 0, sizeof(*oparams)); 3511 oparams->flags = params->flags; 3512 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3513 oparams->masks[i] = params->masks[i].bits[0]; 3514 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3515 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3516 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3517 oparams->info = params->info; 3518 oparams->msbits = params->msbits; 3519 oparams->rate_num = params->rate_num; 3520 oparams->rate_den = params->rate_den; 3521 oparams->fifo_size = params->fifo_size; 3522 } 3523 3524 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3525 struct snd_pcm_hw_params_old __user * _oparams) 3526 { 3527 struct snd_pcm_hw_params *params; 3528 struct snd_pcm_hw_params_old *oparams = NULL; 3529 int err; 3530 3531 params = kmalloc(sizeof(*params), GFP_KERNEL); 3532 if (!params) 3533 return -ENOMEM; 3534 3535 oparams = memdup_user(_oparams, sizeof(*oparams)); 3536 if (IS_ERR(oparams)) { 3537 err = PTR_ERR(oparams); 3538 goto out; 3539 } 3540 snd_pcm_hw_convert_from_old_params(params, oparams); 3541 err = snd_pcm_hw_refine(substream, params); 3542 if (err < 0) 3543 goto out_old; 3544 3545 err = fixup_unreferenced_params(substream, params); 3546 if (err < 0) 3547 goto out_old; 3548 3549 snd_pcm_hw_convert_to_old_params(oparams, params); 3550 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3551 err = -EFAULT; 3552 out_old: 3553 kfree(oparams); 3554 out: 3555 kfree(params); 3556 return err; 3557 } 3558 3559 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3560 struct snd_pcm_hw_params_old __user * _oparams) 3561 { 3562 struct snd_pcm_hw_params *params; 3563 struct snd_pcm_hw_params_old *oparams = NULL; 3564 int err; 3565 3566 params = kmalloc(sizeof(*params), GFP_KERNEL); 3567 if (!params) 3568 return -ENOMEM; 3569 3570 oparams = memdup_user(_oparams, sizeof(*oparams)); 3571 if (IS_ERR(oparams)) { 3572 err = PTR_ERR(oparams); 3573 goto out; 3574 } 3575 3576 snd_pcm_hw_convert_from_old_params(params, oparams); 3577 err = snd_pcm_hw_params(substream, params); 3578 if (err < 0) 3579 goto out_old; 3580 3581 snd_pcm_hw_convert_to_old_params(oparams, params); 3582 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3583 err = -EFAULT; 3584 out_old: 3585 kfree(oparams); 3586 out: 3587 kfree(params); 3588 return err; 3589 } 3590 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3591 3592 #ifndef CONFIG_MMU 3593 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3594 unsigned long addr, 3595 unsigned long len, 3596 unsigned long pgoff, 3597 unsigned long flags) 3598 { 3599 struct snd_pcm_file *pcm_file = file->private_data; 3600 struct snd_pcm_substream *substream = pcm_file->substream; 3601 struct snd_pcm_runtime *runtime = substream->runtime; 3602 unsigned long offset = pgoff << PAGE_SHIFT; 3603 3604 switch (offset) { 3605 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3606 return (unsigned long)runtime->status; 3607 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3608 return (unsigned long)runtime->control; 3609 default: 3610 return (unsigned long)runtime->dma_area + offset; 3611 } 3612 } 3613 #else 3614 # define snd_pcm_get_unmapped_area NULL 3615 #endif 3616 3617 /* 3618 * Register section 3619 */ 3620 3621 const struct file_operations snd_pcm_f_ops[2] = { 3622 { 3623 .owner = THIS_MODULE, 3624 .write = snd_pcm_write, 3625 .write_iter = snd_pcm_writev, 3626 .open = snd_pcm_playback_open, 3627 .release = snd_pcm_release, 3628 .llseek = no_llseek, 3629 .poll = snd_pcm_poll, 3630 .unlocked_ioctl = snd_pcm_ioctl, 3631 .compat_ioctl = snd_pcm_ioctl_compat, 3632 .mmap = snd_pcm_mmap, 3633 .fasync = snd_pcm_fasync, 3634 .get_unmapped_area = snd_pcm_get_unmapped_area, 3635 }, 3636 { 3637 .owner = THIS_MODULE, 3638 .read = snd_pcm_read, 3639 .read_iter = snd_pcm_readv, 3640 .open = snd_pcm_capture_open, 3641 .release = snd_pcm_release, 3642 .llseek = no_llseek, 3643 .poll = snd_pcm_poll, 3644 .unlocked_ioctl = snd_pcm_ioctl, 3645 .compat_ioctl = snd_pcm_ioctl_compat, 3646 .mmap = snd_pcm_mmap, 3647 .fasync = snd_pcm_fasync, 3648 .get_unmapped_area = snd_pcm_get_unmapped_area, 3649 } 3650 }; 3651