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 #include <linux/delay.h> 40 41 #include "pcm_local.h" 42 43 #ifdef CONFIG_SND_DEBUG 44 #define CREATE_TRACE_POINTS 45 #include "pcm_param_trace.h" 46 #else 47 #define trace_hw_mask_param_enabled() 0 48 #define trace_hw_interval_param_enabled() 0 49 #define trace_hw_mask_param(substream, type, index, prev, curr) 50 #define trace_hw_interval_param(substream, type, index, prev, curr) 51 #endif 52 53 /* 54 * Compatibility 55 */ 56 57 struct snd_pcm_hw_params_old { 58 unsigned int flags; 59 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 60 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 61 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 62 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 63 unsigned int rmask; 64 unsigned int cmask; 65 unsigned int info; 66 unsigned int msbits; 67 unsigned int rate_num; 68 unsigned int rate_den; 69 snd_pcm_uframes_t fifo_size; 70 unsigned char reserved[64]; 71 }; 72 73 #ifdef CONFIG_SND_SUPPORT_OLD_API 74 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 75 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 76 77 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 78 struct snd_pcm_hw_params_old __user * _oparams); 79 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 80 struct snd_pcm_hw_params_old __user * _oparams); 81 #endif 82 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 83 84 /* 85 * 86 */ 87 88 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 89 static DECLARE_RWSEM(snd_pcm_link_rwsem); 90 91 /* Writer in rwsem may block readers even during its waiting in queue, 92 * and this may lead to a deadlock when the code path takes read sem 93 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 94 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 95 * sleep until all the readers are completed without blocking by writer. 96 */ 97 static inline void down_write_nonfifo(struct rw_semaphore *lock) 98 { 99 while (!down_write_trylock(lock)) 100 msleep(1); 101 } 102 103 void snd_pcm_group_init(struct snd_pcm_group *group) 104 { 105 spin_lock_init(&group->lock); 106 mutex_init(&group->mutex); 107 INIT_LIST_HEAD(&group->substreams); 108 } 109 110 #define PCM_LOCK_DEFAULT 0 111 #define PCM_LOCK_IRQ 1 112 #define PCM_LOCK_IRQSAVE 2 113 114 static unsigned long __snd_pcm_stream_lock_mode(struct snd_pcm_substream *substream, 115 unsigned int mode) 116 { 117 unsigned long flags = 0; 118 if (substream->pcm->nonatomic) { 119 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 120 mutex_lock(&substream->self_group.mutex); 121 } else { 122 switch (mode) { 123 case PCM_LOCK_DEFAULT: 124 read_lock(&snd_pcm_link_rwlock); 125 break; 126 case PCM_LOCK_IRQ: 127 read_lock_irq(&snd_pcm_link_rwlock); 128 break; 129 case PCM_LOCK_IRQSAVE: 130 read_lock_irqsave(&snd_pcm_link_rwlock, flags); 131 break; 132 } 133 spin_lock(&substream->self_group.lock); 134 } 135 return flags; 136 } 137 138 static void __snd_pcm_stream_unlock_mode(struct snd_pcm_substream *substream, 139 unsigned int mode, unsigned long flags) 140 { 141 if (substream->pcm->nonatomic) { 142 mutex_unlock(&substream->self_group.mutex); 143 up_read(&snd_pcm_link_rwsem); 144 } else { 145 spin_unlock(&substream->self_group.lock); 146 147 switch (mode) { 148 case PCM_LOCK_DEFAULT: 149 read_unlock(&snd_pcm_link_rwlock); 150 break; 151 case PCM_LOCK_IRQ: 152 read_unlock_irq(&snd_pcm_link_rwlock); 153 break; 154 case PCM_LOCK_IRQSAVE: 155 read_unlock_irqrestore(&snd_pcm_link_rwlock, flags); 156 break; 157 } 158 } 159 } 160 161 /** 162 * snd_pcm_stream_lock - Lock the PCM stream 163 * @substream: PCM substream 164 * 165 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 166 * flag of the given substream. This also takes the global link rw lock 167 * (or rw sem), too, for avoiding the race with linked streams. 168 */ 169 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 170 { 171 __snd_pcm_stream_lock_mode(substream, PCM_LOCK_DEFAULT); 172 } 173 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 174 175 /** 176 * snd_pcm_stream_lock - Unlock the PCM stream 177 * @substream: PCM substream 178 * 179 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 180 */ 181 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 182 { 183 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_DEFAULT, 0); 184 } 185 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 186 187 /** 188 * snd_pcm_stream_lock_irq - Lock the PCM stream 189 * @substream: PCM substream 190 * 191 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 192 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 193 * as snd_pcm_stream_lock(). 194 */ 195 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 196 { 197 __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQ); 198 } 199 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 200 201 /** 202 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 203 * @substream: PCM substream 204 * 205 * This is a counter-part of snd_pcm_stream_lock_irq(). 206 */ 207 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 208 { 209 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQ, 0); 210 } 211 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 212 213 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 214 { 215 return __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQSAVE); 216 } 217 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 218 219 /** 220 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 221 * @substream: PCM substream 222 * @flags: irq flags 223 * 224 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 225 */ 226 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 227 unsigned long flags) 228 { 229 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQSAVE, flags); 230 } 231 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 232 233 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 234 { 235 struct snd_pcm *pcm = substream->pcm; 236 struct snd_pcm_str *pstr = substream->pstr; 237 238 memset(info, 0, sizeof(*info)); 239 info->card = pcm->card->number; 240 info->device = pcm->device; 241 info->stream = substream->stream; 242 info->subdevice = substream->number; 243 strlcpy(info->id, pcm->id, sizeof(info->id)); 244 strlcpy(info->name, pcm->name, sizeof(info->name)); 245 info->dev_class = pcm->dev_class; 246 info->dev_subclass = pcm->dev_subclass; 247 info->subdevices_count = pstr->substream_count; 248 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 249 strlcpy(info->subname, substream->name, sizeof(info->subname)); 250 251 return 0; 252 } 253 254 int snd_pcm_info_user(struct snd_pcm_substream *substream, 255 struct snd_pcm_info __user * _info) 256 { 257 struct snd_pcm_info *info; 258 int err; 259 260 info = kmalloc(sizeof(*info), GFP_KERNEL); 261 if (! info) 262 return -ENOMEM; 263 err = snd_pcm_info(substream, info); 264 if (err >= 0) { 265 if (copy_to_user(_info, info, sizeof(*info))) 266 err = -EFAULT; 267 } 268 kfree(info); 269 return err; 270 } 271 272 static bool hw_support_mmap(struct snd_pcm_substream *substream) 273 { 274 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 275 return false; 276 /* architecture supports dma_mmap_coherent()? */ 277 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) 278 if (!substream->ops->mmap && 279 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 280 return false; 281 #endif 282 return true; 283 } 284 285 static int constrain_mask_params(struct snd_pcm_substream *substream, 286 struct snd_pcm_hw_params *params) 287 { 288 struct snd_pcm_hw_constraints *constrs = 289 &substream->runtime->hw_constraints; 290 struct snd_mask *m; 291 unsigned int k; 292 struct snd_mask old_mask; 293 int changed; 294 295 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 296 m = hw_param_mask(params, k); 297 if (snd_mask_empty(m)) 298 return -EINVAL; 299 300 /* This parameter is not requested to change by a caller. */ 301 if (!(params->rmask & (1 << k))) 302 continue; 303 304 if (trace_hw_mask_param_enabled()) 305 old_mask = *m; 306 307 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 308 if (changed < 0) 309 return changed; 310 if (changed == 0) 311 continue; 312 313 /* Set corresponding flag so that the caller gets it. */ 314 trace_hw_mask_param(substream, k, 0, &old_mask, m); 315 params->cmask |= 1 << k; 316 } 317 318 return 0; 319 } 320 321 static int constrain_interval_params(struct snd_pcm_substream *substream, 322 struct snd_pcm_hw_params *params) 323 { 324 struct snd_pcm_hw_constraints *constrs = 325 &substream->runtime->hw_constraints; 326 struct snd_interval *i; 327 unsigned int k; 328 struct snd_interval old_interval; 329 int changed; 330 331 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 332 i = hw_param_interval(params, k); 333 if (snd_interval_empty(i)) 334 return -EINVAL; 335 336 /* This parameter is not requested to change by a caller. */ 337 if (!(params->rmask & (1 << k))) 338 continue; 339 340 if (trace_hw_interval_param_enabled()) 341 old_interval = *i; 342 343 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 344 if (changed < 0) 345 return changed; 346 if (changed == 0) 347 continue; 348 349 /* Set corresponding flag so that the caller gets it. */ 350 trace_hw_interval_param(substream, k, 0, &old_interval, i); 351 params->cmask |= 1 << k; 352 } 353 354 return 0; 355 } 356 357 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 358 struct snd_pcm_hw_params *params) 359 { 360 struct snd_pcm_hw_constraints *constrs = 361 &substream->runtime->hw_constraints; 362 unsigned int k; 363 unsigned int *rstamps; 364 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 365 unsigned int stamp; 366 struct snd_pcm_hw_rule *r; 367 unsigned int d; 368 struct snd_mask old_mask; 369 struct snd_interval old_interval; 370 bool again; 371 int changed, err = 0; 372 373 /* 374 * Each application of rule has own sequence number. 375 * 376 * Each member of 'rstamps' array represents the sequence number of 377 * recent application of corresponding rule. 378 */ 379 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 380 if (!rstamps) 381 return -ENOMEM; 382 383 /* 384 * Each member of 'vstamps' array represents the sequence number of 385 * recent application of rule in which corresponding parameters were 386 * changed. 387 * 388 * In initial state, elements corresponding to parameters requested by 389 * a caller is 1. For unrequested parameters, corresponding members 390 * have 0 so that the parameters are never changed anymore. 391 */ 392 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 393 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 394 395 /* Due to the above design, actual sequence number starts at 2. */ 396 stamp = 2; 397 retry: 398 /* Apply all rules in order. */ 399 again = false; 400 for (k = 0; k < constrs->rules_num; k++) { 401 r = &constrs->rules[k]; 402 403 /* 404 * Check condition bits of this rule. When the rule has 405 * some condition bits, parameter without the bits is 406 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 407 * is an example of the condition bits. 408 */ 409 if (r->cond && !(r->cond & params->flags)) 410 continue; 411 412 /* 413 * The 'deps' array includes maximum three dependencies 414 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 415 * member of this array is a sentinel and should be 416 * negative value. 417 * 418 * This rule should be processed in this time when dependent 419 * parameters were changed at former applications of the other 420 * rules. 421 */ 422 for (d = 0; r->deps[d] >= 0; d++) { 423 if (vstamps[r->deps[d]] > rstamps[k]) 424 break; 425 } 426 if (r->deps[d] < 0) 427 continue; 428 429 if (trace_hw_mask_param_enabled()) { 430 if (hw_is_mask(r->var)) 431 old_mask = *hw_param_mask(params, r->var); 432 } 433 if (trace_hw_interval_param_enabled()) { 434 if (hw_is_interval(r->var)) 435 old_interval = *hw_param_interval(params, r->var); 436 } 437 438 changed = r->func(params, r); 439 if (changed < 0) { 440 err = changed; 441 goto out; 442 } 443 444 /* 445 * When the parameter is changed, notify it to the caller 446 * by corresponding returned bit, then preparing for next 447 * iteration. 448 */ 449 if (changed && r->var >= 0) { 450 if (hw_is_mask(r->var)) { 451 trace_hw_mask_param(substream, r->var, 452 k + 1, &old_mask, 453 hw_param_mask(params, r->var)); 454 } 455 if (hw_is_interval(r->var)) { 456 trace_hw_interval_param(substream, r->var, 457 k + 1, &old_interval, 458 hw_param_interval(params, r->var)); 459 } 460 461 params->cmask |= (1 << r->var); 462 vstamps[r->var] = stamp; 463 again = true; 464 } 465 466 rstamps[k] = stamp++; 467 } 468 469 /* Iterate to evaluate all rules till no parameters are changed. */ 470 if (again) 471 goto retry; 472 473 out: 474 kfree(rstamps); 475 return err; 476 } 477 478 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 479 struct snd_pcm_hw_params *params) 480 { 481 const struct snd_interval *i; 482 const struct snd_mask *m; 483 int err; 484 485 if (!params->msbits) { 486 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 487 if (snd_interval_single(i)) 488 params->msbits = snd_interval_value(i); 489 } 490 491 if (!params->rate_den) { 492 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 493 if (snd_interval_single(i)) { 494 params->rate_num = snd_interval_value(i); 495 params->rate_den = 1; 496 } 497 } 498 499 if (!params->fifo_size) { 500 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 501 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 502 if (snd_mask_single(m) && snd_interval_single(i)) { 503 err = substream->ops->ioctl(substream, 504 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 505 if (err < 0) 506 return err; 507 } 508 } 509 510 if (!params->info) { 511 params->info = substream->runtime->hw.info; 512 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 513 SNDRV_PCM_INFO_DRAIN_TRIGGER); 514 if (!hw_support_mmap(substream)) 515 params->info &= ~(SNDRV_PCM_INFO_MMAP | 516 SNDRV_PCM_INFO_MMAP_VALID); 517 } 518 519 return 0; 520 } 521 522 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 523 struct snd_pcm_hw_params *params) 524 { 525 int err; 526 527 params->info = 0; 528 params->fifo_size = 0; 529 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 530 params->msbits = 0; 531 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 532 params->rate_num = 0; 533 params->rate_den = 0; 534 } 535 536 err = constrain_mask_params(substream, params); 537 if (err < 0) 538 return err; 539 540 err = constrain_interval_params(substream, params); 541 if (err < 0) 542 return err; 543 544 err = constrain_params_by_rules(substream, params); 545 if (err < 0) 546 return err; 547 548 params->rmask = 0; 549 550 return 0; 551 } 552 EXPORT_SYMBOL(snd_pcm_hw_refine); 553 554 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 555 struct snd_pcm_hw_params __user * _params) 556 { 557 struct snd_pcm_hw_params *params; 558 int err; 559 560 params = memdup_user(_params, sizeof(*params)); 561 if (IS_ERR(params)) 562 return PTR_ERR(params); 563 564 err = snd_pcm_hw_refine(substream, params); 565 if (err < 0) 566 goto end; 567 568 err = fixup_unreferenced_params(substream, params); 569 if (err < 0) 570 goto end; 571 572 if (copy_to_user(_params, params, sizeof(*params))) 573 err = -EFAULT; 574 end: 575 kfree(params); 576 return err; 577 } 578 579 static int period_to_usecs(struct snd_pcm_runtime *runtime) 580 { 581 int usecs; 582 583 if (! runtime->rate) 584 return -1; /* invalid */ 585 586 /* take 75% of period time as the deadline */ 587 usecs = (750000 / runtime->rate) * runtime->period_size; 588 usecs += ((750000 % runtime->rate) * runtime->period_size) / 589 runtime->rate; 590 591 return usecs; 592 } 593 594 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 595 { 596 snd_pcm_stream_lock_irq(substream); 597 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 598 substream->runtime->status->state = state; 599 snd_pcm_stream_unlock_irq(substream); 600 } 601 602 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 603 int event) 604 { 605 #ifdef CONFIG_SND_PCM_TIMER 606 if (substream->timer) 607 snd_timer_notify(substream->timer, event, 608 &substream->runtime->trigger_tstamp); 609 #endif 610 } 611 612 /** 613 * snd_pcm_hw_param_choose - choose a configuration defined by @params 614 * @pcm: PCM instance 615 * @params: the hw_params instance 616 * 617 * Choose one configuration from configuration space defined by @params. 618 * The configuration chosen is that obtained fixing in this order: 619 * first access, first format, first subformat, min channels, 620 * min rate, min period time, max buffer size, min tick time 621 * 622 * Return: Zero if successful, or a negative error code on failure. 623 */ 624 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 625 struct snd_pcm_hw_params *params) 626 { 627 static const int vars[] = { 628 SNDRV_PCM_HW_PARAM_ACCESS, 629 SNDRV_PCM_HW_PARAM_FORMAT, 630 SNDRV_PCM_HW_PARAM_SUBFORMAT, 631 SNDRV_PCM_HW_PARAM_CHANNELS, 632 SNDRV_PCM_HW_PARAM_RATE, 633 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 634 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 635 SNDRV_PCM_HW_PARAM_TICK_TIME, 636 -1 637 }; 638 const int *v; 639 struct snd_mask old_mask; 640 struct snd_interval old_interval; 641 int changed; 642 643 for (v = vars; *v != -1; v++) { 644 /* Keep old parameter to trace. */ 645 if (trace_hw_mask_param_enabled()) { 646 if (hw_is_mask(*v)) 647 old_mask = *hw_param_mask(params, *v); 648 } 649 if (trace_hw_interval_param_enabled()) { 650 if (hw_is_interval(*v)) 651 old_interval = *hw_param_interval(params, *v); 652 } 653 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 654 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 655 else 656 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 657 if (changed < 0) 658 return changed; 659 if (changed == 0) 660 continue; 661 662 /* Trace the changed parameter. */ 663 if (hw_is_mask(*v)) { 664 trace_hw_mask_param(pcm, *v, 0, &old_mask, 665 hw_param_mask(params, *v)); 666 } 667 if (hw_is_interval(*v)) { 668 trace_hw_interval_param(pcm, *v, 0, &old_interval, 669 hw_param_interval(params, *v)); 670 } 671 } 672 673 return 0; 674 } 675 676 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 677 struct snd_pcm_hw_params *params) 678 { 679 struct snd_pcm_runtime *runtime; 680 int err, usecs; 681 unsigned int bits; 682 snd_pcm_uframes_t frames; 683 684 if (PCM_RUNTIME_CHECK(substream)) 685 return -ENXIO; 686 runtime = substream->runtime; 687 snd_pcm_stream_lock_irq(substream); 688 switch (runtime->status->state) { 689 case SNDRV_PCM_STATE_OPEN: 690 case SNDRV_PCM_STATE_SETUP: 691 case SNDRV_PCM_STATE_PREPARED: 692 break; 693 default: 694 snd_pcm_stream_unlock_irq(substream); 695 return -EBADFD; 696 } 697 snd_pcm_stream_unlock_irq(substream); 698 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 699 if (!substream->oss.oss) 700 #endif 701 if (atomic_read(&substream->mmap_count)) 702 return -EBADFD; 703 704 params->rmask = ~0U; 705 err = snd_pcm_hw_refine(substream, params); 706 if (err < 0) 707 goto _error; 708 709 err = snd_pcm_hw_params_choose(substream, params); 710 if (err < 0) 711 goto _error; 712 713 err = fixup_unreferenced_params(substream, params); 714 if (err < 0) 715 goto _error; 716 717 if (substream->ops->hw_params != NULL) { 718 err = substream->ops->hw_params(substream, params); 719 if (err < 0) 720 goto _error; 721 } 722 723 runtime->access = params_access(params); 724 runtime->format = params_format(params); 725 runtime->subformat = params_subformat(params); 726 runtime->channels = params_channels(params); 727 runtime->rate = params_rate(params); 728 runtime->period_size = params_period_size(params); 729 runtime->periods = params_periods(params); 730 runtime->buffer_size = params_buffer_size(params); 731 runtime->info = params->info; 732 runtime->rate_num = params->rate_num; 733 runtime->rate_den = params->rate_den; 734 runtime->no_period_wakeup = 735 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 736 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 737 738 bits = snd_pcm_format_physical_width(runtime->format); 739 runtime->sample_bits = bits; 740 bits *= runtime->channels; 741 runtime->frame_bits = bits; 742 frames = 1; 743 while (bits % 8 != 0) { 744 bits *= 2; 745 frames *= 2; 746 } 747 runtime->byte_align = bits / 8; 748 runtime->min_align = frames; 749 750 /* Default sw params */ 751 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 752 runtime->period_step = 1; 753 runtime->control->avail_min = runtime->period_size; 754 runtime->start_threshold = 1; 755 runtime->stop_threshold = runtime->buffer_size; 756 runtime->silence_threshold = 0; 757 runtime->silence_size = 0; 758 runtime->boundary = runtime->buffer_size; 759 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 760 runtime->boundary *= 2; 761 762 snd_pcm_timer_resolution_change(substream); 763 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 764 765 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 766 pm_qos_remove_request(&substream->latency_pm_qos_req); 767 if ((usecs = period_to_usecs(runtime)) >= 0) 768 pm_qos_add_request(&substream->latency_pm_qos_req, 769 PM_QOS_CPU_DMA_LATENCY, usecs); 770 return 0; 771 _error: 772 /* hardware might be unusable from this time, 773 so we force application to retry to set 774 the correct hardware parameter settings */ 775 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 776 if (substream->ops->hw_free != NULL) 777 substream->ops->hw_free(substream); 778 return err; 779 } 780 781 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 782 struct snd_pcm_hw_params __user * _params) 783 { 784 struct snd_pcm_hw_params *params; 785 int err; 786 787 params = memdup_user(_params, sizeof(*params)); 788 if (IS_ERR(params)) 789 return PTR_ERR(params); 790 791 err = snd_pcm_hw_params(substream, params); 792 if (err < 0) 793 goto end; 794 795 if (copy_to_user(_params, params, sizeof(*params))) 796 err = -EFAULT; 797 end: 798 kfree(params); 799 return err; 800 } 801 802 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 803 { 804 struct snd_pcm_runtime *runtime; 805 int result = 0; 806 807 if (PCM_RUNTIME_CHECK(substream)) 808 return -ENXIO; 809 runtime = substream->runtime; 810 snd_pcm_stream_lock_irq(substream); 811 switch (runtime->status->state) { 812 case SNDRV_PCM_STATE_SETUP: 813 case SNDRV_PCM_STATE_PREPARED: 814 break; 815 default: 816 snd_pcm_stream_unlock_irq(substream); 817 return -EBADFD; 818 } 819 snd_pcm_stream_unlock_irq(substream); 820 if (atomic_read(&substream->mmap_count)) 821 return -EBADFD; 822 if (substream->ops->hw_free) 823 result = substream->ops->hw_free(substream); 824 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 825 pm_qos_remove_request(&substream->latency_pm_qos_req); 826 return result; 827 } 828 829 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 830 struct snd_pcm_sw_params *params) 831 { 832 struct snd_pcm_runtime *runtime; 833 int err; 834 835 if (PCM_RUNTIME_CHECK(substream)) 836 return -ENXIO; 837 runtime = substream->runtime; 838 snd_pcm_stream_lock_irq(substream); 839 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 840 snd_pcm_stream_unlock_irq(substream); 841 return -EBADFD; 842 } 843 snd_pcm_stream_unlock_irq(substream); 844 845 if (params->tstamp_mode < 0 || 846 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 847 return -EINVAL; 848 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 849 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 850 return -EINVAL; 851 if (params->avail_min == 0) 852 return -EINVAL; 853 if (params->silence_size >= runtime->boundary) { 854 if (params->silence_threshold != 0) 855 return -EINVAL; 856 } else { 857 if (params->silence_size > params->silence_threshold) 858 return -EINVAL; 859 if (params->silence_threshold > runtime->buffer_size) 860 return -EINVAL; 861 } 862 err = 0; 863 snd_pcm_stream_lock_irq(substream); 864 runtime->tstamp_mode = params->tstamp_mode; 865 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 866 runtime->tstamp_type = params->tstamp_type; 867 runtime->period_step = params->period_step; 868 runtime->control->avail_min = params->avail_min; 869 runtime->start_threshold = params->start_threshold; 870 runtime->stop_threshold = params->stop_threshold; 871 runtime->silence_threshold = params->silence_threshold; 872 runtime->silence_size = params->silence_size; 873 params->boundary = runtime->boundary; 874 if (snd_pcm_running(substream)) { 875 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 876 runtime->silence_size > 0) 877 snd_pcm_playback_silence(substream, ULONG_MAX); 878 err = snd_pcm_update_state(substream, runtime); 879 } 880 snd_pcm_stream_unlock_irq(substream); 881 return err; 882 } 883 884 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 885 struct snd_pcm_sw_params __user * _params) 886 { 887 struct snd_pcm_sw_params params; 888 int err; 889 if (copy_from_user(¶ms, _params, sizeof(params))) 890 return -EFAULT; 891 err = snd_pcm_sw_params(substream, ¶ms); 892 if (copy_to_user(_params, ¶ms, sizeof(params))) 893 return -EFAULT; 894 return err; 895 } 896 897 static inline snd_pcm_uframes_t 898 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 899 { 900 snd_pcm_uframes_t delay; 901 902 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 903 delay = snd_pcm_playback_hw_avail(substream->runtime); 904 else 905 delay = snd_pcm_capture_avail(substream->runtime); 906 return delay + substream->runtime->delay; 907 } 908 909 int snd_pcm_status(struct snd_pcm_substream *substream, 910 struct snd_pcm_status *status) 911 { 912 struct snd_pcm_runtime *runtime = substream->runtime; 913 914 snd_pcm_stream_lock_irq(substream); 915 916 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 917 &runtime->audio_tstamp_config); 918 919 /* backwards compatible behavior */ 920 if (runtime->audio_tstamp_config.type_requested == 921 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 922 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 923 runtime->audio_tstamp_config.type_requested = 924 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 925 else 926 runtime->audio_tstamp_config.type_requested = 927 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 928 runtime->audio_tstamp_report.valid = 0; 929 } else 930 runtime->audio_tstamp_report.valid = 1; 931 932 status->state = runtime->status->state; 933 status->suspended_state = runtime->status->suspended_state; 934 if (status->state == SNDRV_PCM_STATE_OPEN) 935 goto _end; 936 status->trigger_tstamp = runtime->trigger_tstamp; 937 if (snd_pcm_running(substream)) { 938 snd_pcm_update_hw_ptr(substream); 939 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 940 status->tstamp = runtime->status->tstamp; 941 status->driver_tstamp = runtime->driver_tstamp; 942 status->audio_tstamp = 943 runtime->status->audio_tstamp; 944 if (runtime->audio_tstamp_report.valid == 1) 945 /* backwards compatibility, no report provided in COMPAT mode */ 946 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 947 &status->audio_tstamp_accuracy, 948 &runtime->audio_tstamp_report); 949 950 goto _tstamp_end; 951 } 952 } else { 953 /* get tstamp only in fallback mode and only if enabled */ 954 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 955 snd_pcm_gettime(runtime, &status->tstamp); 956 } 957 _tstamp_end: 958 status->appl_ptr = runtime->control->appl_ptr; 959 status->hw_ptr = runtime->status->hw_ptr; 960 status->avail = snd_pcm_avail(substream); 961 status->delay = snd_pcm_running(substream) ? 962 snd_pcm_calc_delay(substream) : 0; 963 status->avail_max = runtime->avail_max; 964 status->overrange = runtime->overrange; 965 runtime->avail_max = 0; 966 runtime->overrange = 0; 967 _end: 968 snd_pcm_stream_unlock_irq(substream); 969 return 0; 970 } 971 972 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 973 struct snd_pcm_status __user * _status, 974 bool ext) 975 { 976 struct snd_pcm_status status; 977 int res; 978 979 memset(&status, 0, sizeof(status)); 980 /* 981 * with extension, parameters are read/write, 982 * get audio_tstamp_data from user, 983 * ignore rest of status structure 984 */ 985 if (ext && get_user(status.audio_tstamp_data, 986 (u32 __user *)(&_status->audio_tstamp_data))) 987 return -EFAULT; 988 res = snd_pcm_status(substream, &status); 989 if (res < 0) 990 return res; 991 if (copy_to_user(_status, &status, sizeof(status))) 992 return -EFAULT; 993 return 0; 994 } 995 996 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 997 struct snd_pcm_channel_info * info) 998 { 999 struct snd_pcm_runtime *runtime; 1000 unsigned int channel; 1001 1002 channel = info->channel; 1003 runtime = substream->runtime; 1004 snd_pcm_stream_lock_irq(substream); 1005 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 1006 snd_pcm_stream_unlock_irq(substream); 1007 return -EBADFD; 1008 } 1009 snd_pcm_stream_unlock_irq(substream); 1010 if (channel >= runtime->channels) 1011 return -EINVAL; 1012 memset(info, 0, sizeof(*info)); 1013 info->channel = channel; 1014 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 1015 } 1016 1017 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 1018 struct snd_pcm_channel_info __user * _info) 1019 { 1020 struct snd_pcm_channel_info info; 1021 int res; 1022 1023 if (copy_from_user(&info, _info, sizeof(info))) 1024 return -EFAULT; 1025 res = snd_pcm_channel_info(substream, &info); 1026 if (res < 0) 1027 return res; 1028 if (copy_to_user(_info, &info, sizeof(info))) 1029 return -EFAULT; 1030 return 0; 1031 } 1032 1033 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1034 { 1035 struct snd_pcm_runtime *runtime = substream->runtime; 1036 if (runtime->trigger_master == NULL) 1037 return; 1038 if (runtime->trigger_master == substream) { 1039 if (!runtime->trigger_tstamp_latched) 1040 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1041 } else { 1042 snd_pcm_trigger_tstamp(runtime->trigger_master); 1043 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1044 } 1045 runtime->trigger_master = NULL; 1046 } 1047 1048 struct action_ops { 1049 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1050 int (*do_action)(struct snd_pcm_substream *substream, int state); 1051 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1052 void (*post_action)(struct snd_pcm_substream *substream, int state); 1053 }; 1054 1055 /* 1056 * this functions is core for handling of linked stream 1057 * Note: the stream state might be changed also on failure 1058 * Note2: call with calling stream lock + link lock 1059 */ 1060 static int snd_pcm_action_group(const struct action_ops *ops, 1061 struct snd_pcm_substream *substream, 1062 int state, int do_lock) 1063 { 1064 struct snd_pcm_substream *s = NULL; 1065 struct snd_pcm_substream *s1; 1066 int res = 0, depth = 1; 1067 1068 snd_pcm_group_for_each_entry(s, substream) { 1069 if (do_lock && s != substream) { 1070 if (s->pcm->nonatomic) 1071 mutex_lock_nested(&s->self_group.mutex, depth); 1072 else 1073 spin_lock_nested(&s->self_group.lock, depth); 1074 depth++; 1075 } 1076 res = ops->pre_action(s, state); 1077 if (res < 0) 1078 goto _unlock; 1079 } 1080 snd_pcm_group_for_each_entry(s, substream) { 1081 res = ops->do_action(s, state); 1082 if (res < 0) { 1083 if (ops->undo_action) { 1084 snd_pcm_group_for_each_entry(s1, substream) { 1085 if (s1 == s) /* failed stream */ 1086 break; 1087 ops->undo_action(s1, state); 1088 } 1089 } 1090 s = NULL; /* unlock all */ 1091 goto _unlock; 1092 } 1093 } 1094 snd_pcm_group_for_each_entry(s, substream) { 1095 ops->post_action(s, state); 1096 } 1097 _unlock: 1098 if (do_lock) { 1099 /* unlock streams */ 1100 snd_pcm_group_for_each_entry(s1, substream) { 1101 if (s1 != substream) { 1102 if (s1->pcm->nonatomic) 1103 mutex_unlock(&s1->self_group.mutex); 1104 else 1105 spin_unlock(&s1->self_group.lock); 1106 } 1107 if (s1 == s) /* end */ 1108 break; 1109 } 1110 } 1111 return res; 1112 } 1113 1114 /* 1115 * Note: call with stream lock 1116 */ 1117 static int snd_pcm_action_single(const struct action_ops *ops, 1118 struct snd_pcm_substream *substream, 1119 int state) 1120 { 1121 int res; 1122 1123 res = ops->pre_action(substream, state); 1124 if (res < 0) 1125 return res; 1126 res = ops->do_action(substream, state); 1127 if (res == 0) 1128 ops->post_action(substream, state); 1129 else if (ops->undo_action) 1130 ops->undo_action(substream, state); 1131 return res; 1132 } 1133 1134 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1135 struct snd_pcm_group *new_group) 1136 { 1137 substream->group = new_group; 1138 list_move(&substream->link_list, &new_group->substreams); 1139 } 1140 1141 /* 1142 * Note: call with stream lock 1143 */ 1144 static int snd_pcm_action(const struct action_ops *ops, 1145 struct snd_pcm_substream *substream, 1146 int state) 1147 { 1148 int res; 1149 1150 if (!snd_pcm_stream_linked(substream)) 1151 return snd_pcm_action_single(ops, substream, state); 1152 1153 if (substream->pcm->nonatomic) { 1154 if (!mutex_trylock(&substream->group->mutex)) { 1155 mutex_unlock(&substream->self_group.mutex); 1156 mutex_lock(&substream->group->mutex); 1157 mutex_lock(&substream->self_group.mutex); 1158 } 1159 res = snd_pcm_action_group(ops, substream, state, 1); 1160 mutex_unlock(&substream->group->mutex); 1161 } else { 1162 if (!spin_trylock(&substream->group->lock)) { 1163 spin_unlock(&substream->self_group.lock); 1164 spin_lock(&substream->group->lock); 1165 spin_lock(&substream->self_group.lock); 1166 } 1167 res = snd_pcm_action_group(ops, substream, state, 1); 1168 spin_unlock(&substream->group->lock); 1169 } 1170 return res; 1171 } 1172 1173 /* 1174 * Note: don't use any locks before 1175 */ 1176 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1177 struct snd_pcm_substream *substream, 1178 int state) 1179 { 1180 int res; 1181 1182 snd_pcm_stream_lock_irq(substream); 1183 res = snd_pcm_action(ops, substream, state); 1184 snd_pcm_stream_unlock_irq(substream); 1185 return res; 1186 } 1187 1188 /* 1189 */ 1190 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1191 struct snd_pcm_substream *substream, 1192 int state) 1193 { 1194 int res; 1195 1196 down_read(&snd_pcm_link_rwsem); 1197 if (snd_pcm_stream_linked(substream)) 1198 res = snd_pcm_action_group(ops, substream, state, 0); 1199 else 1200 res = snd_pcm_action_single(ops, substream, state); 1201 up_read(&snd_pcm_link_rwsem); 1202 return res; 1203 } 1204 1205 /* 1206 * start callbacks 1207 */ 1208 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1209 { 1210 struct snd_pcm_runtime *runtime = substream->runtime; 1211 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1212 return -EBADFD; 1213 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1214 !snd_pcm_playback_data(substream)) 1215 return -EPIPE; 1216 runtime->trigger_tstamp_latched = false; 1217 runtime->trigger_master = substream; 1218 return 0; 1219 } 1220 1221 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1222 { 1223 if (substream->runtime->trigger_master != substream) 1224 return 0; 1225 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1226 } 1227 1228 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1229 { 1230 if (substream->runtime->trigger_master == substream) 1231 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1232 } 1233 1234 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1235 { 1236 struct snd_pcm_runtime *runtime = substream->runtime; 1237 snd_pcm_trigger_tstamp(substream); 1238 runtime->hw_ptr_jiffies = jiffies; 1239 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1240 runtime->rate; 1241 runtime->status->state = state; 1242 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1243 runtime->silence_size > 0) 1244 snd_pcm_playback_silence(substream, ULONG_MAX); 1245 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1246 } 1247 1248 static const struct action_ops snd_pcm_action_start = { 1249 .pre_action = snd_pcm_pre_start, 1250 .do_action = snd_pcm_do_start, 1251 .undo_action = snd_pcm_undo_start, 1252 .post_action = snd_pcm_post_start 1253 }; 1254 1255 /** 1256 * snd_pcm_start - start all linked streams 1257 * @substream: the PCM substream instance 1258 * 1259 * Return: Zero if successful, or a negative error code. 1260 * The stream lock must be acquired before calling this function. 1261 */ 1262 int snd_pcm_start(struct snd_pcm_substream *substream) 1263 { 1264 return snd_pcm_action(&snd_pcm_action_start, substream, 1265 SNDRV_PCM_STATE_RUNNING); 1266 } 1267 1268 /* take the stream lock and start the streams */ 1269 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1270 { 1271 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1272 SNDRV_PCM_STATE_RUNNING); 1273 } 1274 1275 /* 1276 * stop callbacks 1277 */ 1278 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1279 { 1280 struct snd_pcm_runtime *runtime = substream->runtime; 1281 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1282 return -EBADFD; 1283 runtime->trigger_master = substream; 1284 return 0; 1285 } 1286 1287 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1288 { 1289 if (substream->runtime->trigger_master == substream && 1290 snd_pcm_running(substream)) 1291 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1292 return 0; /* unconditonally stop all substreams */ 1293 } 1294 1295 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1296 { 1297 struct snd_pcm_runtime *runtime = substream->runtime; 1298 if (runtime->status->state != state) { 1299 snd_pcm_trigger_tstamp(substream); 1300 runtime->status->state = state; 1301 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1302 } 1303 wake_up(&runtime->sleep); 1304 wake_up(&runtime->tsleep); 1305 } 1306 1307 static const struct action_ops snd_pcm_action_stop = { 1308 .pre_action = snd_pcm_pre_stop, 1309 .do_action = snd_pcm_do_stop, 1310 .post_action = snd_pcm_post_stop 1311 }; 1312 1313 /** 1314 * snd_pcm_stop - try to stop all running streams in the substream group 1315 * @substream: the PCM substream instance 1316 * @state: PCM state after stopping the stream 1317 * 1318 * The state of each stream is then changed to the given state unconditionally. 1319 * 1320 * Return: Zero if successful, or a negative error code. 1321 */ 1322 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1323 { 1324 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1325 } 1326 EXPORT_SYMBOL(snd_pcm_stop); 1327 1328 /** 1329 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1330 * @substream: the PCM substream 1331 * 1332 * After stopping, the state is changed to SETUP. 1333 * Unlike snd_pcm_stop(), this affects only the given stream. 1334 * 1335 * Return: Zero if succesful, or a negative error code. 1336 */ 1337 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1338 { 1339 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1340 SNDRV_PCM_STATE_SETUP); 1341 } 1342 1343 /** 1344 * snd_pcm_stop_xrun - stop the running streams as XRUN 1345 * @substream: the PCM substream instance 1346 * 1347 * This stops the given running substream (and all linked substreams) as XRUN. 1348 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1349 * 1350 * Return: Zero if successful, or a negative error code. 1351 */ 1352 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1353 { 1354 unsigned long flags; 1355 1356 snd_pcm_stream_lock_irqsave(substream, flags); 1357 if (substream->runtime && snd_pcm_running(substream)) 1358 __snd_pcm_xrun(substream); 1359 snd_pcm_stream_unlock_irqrestore(substream, flags); 1360 return 0; 1361 } 1362 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1363 1364 /* 1365 * pause callbacks 1366 */ 1367 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1368 { 1369 struct snd_pcm_runtime *runtime = substream->runtime; 1370 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1371 return -ENOSYS; 1372 if (push) { 1373 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1374 return -EBADFD; 1375 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1376 return -EBADFD; 1377 runtime->trigger_master = substream; 1378 return 0; 1379 } 1380 1381 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1382 { 1383 if (substream->runtime->trigger_master != substream) 1384 return 0; 1385 /* some drivers might use hw_ptr to recover from the pause - 1386 update the hw_ptr now */ 1387 if (push) 1388 snd_pcm_update_hw_ptr(substream); 1389 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1390 * a delta between the current jiffies, this gives a large enough 1391 * delta, effectively to skip the check once. 1392 */ 1393 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1394 return substream->ops->trigger(substream, 1395 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1396 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1397 } 1398 1399 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1400 { 1401 if (substream->runtime->trigger_master == substream) 1402 substream->ops->trigger(substream, 1403 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1404 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1405 } 1406 1407 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1408 { 1409 struct snd_pcm_runtime *runtime = substream->runtime; 1410 snd_pcm_trigger_tstamp(substream); 1411 if (push) { 1412 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1413 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1414 wake_up(&runtime->sleep); 1415 wake_up(&runtime->tsleep); 1416 } else { 1417 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1418 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1419 } 1420 } 1421 1422 static const struct action_ops snd_pcm_action_pause = { 1423 .pre_action = snd_pcm_pre_pause, 1424 .do_action = snd_pcm_do_pause, 1425 .undo_action = snd_pcm_undo_pause, 1426 .post_action = snd_pcm_post_pause 1427 }; 1428 1429 /* 1430 * Push/release the pause for all linked streams. 1431 */ 1432 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1433 { 1434 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1435 } 1436 1437 #ifdef CONFIG_PM 1438 /* suspend */ 1439 1440 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1441 { 1442 struct snd_pcm_runtime *runtime = substream->runtime; 1443 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1444 return -EBUSY; 1445 runtime->trigger_master = substream; 1446 return 0; 1447 } 1448 1449 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1450 { 1451 struct snd_pcm_runtime *runtime = substream->runtime; 1452 if (runtime->trigger_master != substream) 1453 return 0; 1454 if (! snd_pcm_running(substream)) 1455 return 0; 1456 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1457 return 0; /* suspend unconditionally */ 1458 } 1459 1460 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1461 { 1462 struct snd_pcm_runtime *runtime = substream->runtime; 1463 snd_pcm_trigger_tstamp(substream); 1464 runtime->status->suspended_state = runtime->status->state; 1465 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1466 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1467 wake_up(&runtime->sleep); 1468 wake_up(&runtime->tsleep); 1469 } 1470 1471 static const struct action_ops snd_pcm_action_suspend = { 1472 .pre_action = snd_pcm_pre_suspend, 1473 .do_action = snd_pcm_do_suspend, 1474 .post_action = snd_pcm_post_suspend 1475 }; 1476 1477 /** 1478 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1479 * @substream: the PCM substream 1480 * 1481 * After this call, all streams are changed to SUSPENDED state. 1482 * 1483 * Return: Zero if successful (or @substream is %NULL), or a negative error 1484 * code. 1485 */ 1486 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1487 { 1488 int err; 1489 unsigned long flags; 1490 1491 if (! substream) 1492 return 0; 1493 1494 snd_pcm_stream_lock_irqsave(substream, flags); 1495 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1496 snd_pcm_stream_unlock_irqrestore(substream, flags); 1497 return err; 1498 } 1499 EXPORT_SYMBOL(snd_pcm_suspend); 1500 1501 /** 1502 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1503 * @pcm: the PCM instance 1504 * 1505 * After this call, all streams are changed to SUSPENDED state. 1506 * 1507 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1508 */ 1509 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1510 { 1511 struct snd_pcm_substream *substream; 1512 int stream, err = 0; 1513 1514 if (! pcm) 1515 return 0; 1516 1517 for (stream = 0; stream < 2; stream++) { 1518 for (substream = pcm->streams[stream].substream; 1519 substream; substream = substream->next) { 1520 /* FIXME: the open/close code should lock this as well */ 1521 if (substream->runtime == NULL) 1522 continue; 1523 err = snd_pcm_suspend(substream); 1524 if (err < 0 && err != -EBUSY) 1525 return err; 1526 } 1527 } 1528 return 0; 1529 } 1530 EXPORT_SYMBOL(snd_pcm_suspend_all); 1531 1532 /* resume */ 1533 1534 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1535 { 1536 struct snd_pcm_runtime *runtime = substream->runtime; 1537 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1538 return -ENOSYS; 1539 runtime->trigger_master = substream; 1540 return 0; 1541 } 1542 1543 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1544 { 1545 struct snd_pcm_runtime *runtime = substream->runtime; 1546 if (runtime->trigger_master != substream) 1547 return 0; 1548 /* DMA not running previously? */ 1549 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1550 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1551 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1552 return 0; 1553 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1554 } 1555 1556 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1557 { 1558 if (substream->runtime->trigger_master == substream && 1559 snd_pcm_running(substream)) 1560 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1561 } 1562 1563 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1564 { 1565 struct snd_pcm_runtime *runtime = substream->runtime; 1566 snd_pcm_trigger_tstamp(substream); 1567 runtime->status->state = runtime->status->suspended_state; 1568 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1569 } 1570 1571 static const struct action_ops snd_pcm_action_resume = { 1572 .pre_action = snd_pcm_pre_resume, 1573 .do_action = snd_pcm_do_resume, 1574 .undo_action = snd_pcm_undo_resume, 1575 .post_action = snd_pcm_post_resume 1576 }; 1577 1578 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1579 { 1580 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1581 } 1582 1583 #else 1584 1585 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1586 { 1587 return -ENOSYS; 1588 } 1589 1590 #endif /* CONFIG_PM */ 1591 1592 /* 1593 * xrun ioctl 1594 * 1595 * Change the RUNNING stream(s) to XRUN state. 1596 */ 1597 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1598 { 1599 struct snd_pcm_runtime *runtime = substream->runtime; 1600 int result; 1601 1602 snd_pcm_stream_lock_irq(substream); 1603 switch (runtime->status->state) { 1604 case SNDRV_PCM_STATE_XRUN: 1605 result = 0; /* already there */ 1606 break; 1607 case SNDRV_PCM_STATE_RUNNING: 1608 __snd_pcm_xrun(substream); 1609 result = 0; 1610 break; 1611 default: 1612 result = -EBADFD; 1613 } 1614 snd_pcm_stream_unlock_irq(substream); 1615 return result; 1616 } 1617 1618 /* 1619 * reset ioctl 1620 */ 1621 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1622 { 1623 struct snd_pcm_runtime *runtime = substream->runtime; 1624 switch (runtime->status->state) { 1625 case SNDRV_PCM_STATE_RUNNING: 1626 case SNDRV_PCM_STATE_PREPARED: 1627 case SNDRV_PCM_STATE_PAUSED: 1628 case SNDRV_PCM_STATE_SUSPENDED: 1629 return 0; 1630 default: 1631 return -EBADFD; 1632 } 1633 } 1634 1635 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1636 { 1637 struct snd_pcm_runtime *runtime = substream->runtime; 1638 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1639 if (err < 0) 1640 return err; 1641 runtime->hw_ptr_base = 0; 1642 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1643 runtime->status->hw_ptr % runtime->period_size; 1644 runtime->silence_start = runtime->status->hw_ptr; 1645 runtime->silence_filled = 0; 1646 return 0; 1647 } 1648 1649 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1650 { 1651 struct snd_pcm_runtime *runtime = substream->runtime; 1652 runtime->control->appl_ptr = runtime->status->hw_ptr; 1653 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1654 runtime->silence_size > 0) 1655 snd_pcm_playback_silence(substream, ULONG_MAX); 1656 } 1657 1658 static const struct action_ops snd_pcm_action_reset = { 1659 .pre_action = snd_pcm_pre_reset, 1660 .do_action = snd_pcm_do_reset, 1661 .post_action = snd_pcm_post_reset 1662 }; 1663 1664 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1665 { 1666 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1667 } 1668 1669 /* 1670 * prepare ioctl 1671 */ 1672 /* we use the second argument for updating f_flags */ 1673 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1674 int f_flags) 1675 { 1676 struct snd_pcm_runtime *runtime = substream->runtime; 1677 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1678 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1679 return -EBADFD; 1680 if (snd_pcm_running(substream)) 1681 return -EBUSY; 1682 substream->f_flags = f_flags; 1683 return 0; 1684 } 1685 1686 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1687 { 1688 int err; 1689 err = substream->ops->prepare(substream); 1690 if (err < 0) 1691 return err; 1692 return snd_pcm_do_reset(substream, 0); 1693 } 1694 1695 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1696 { 1697 struct snd_pcm_runtime *runtime = substream->runtime; 1698 runtime->control->appl_ptr = runtime->status->hw_ptr; 1699 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1700 } 1701 1702 static const struct action_ops snd_pcm_action_prepare = { 1703 .pre_action = snd_pcm_pre_prepare, 1704 .do_action = snd_pcm_do_prepare, 1705 .post_action = snd_pcm_post_prepare 1706 }; 1707 1708 /** 1709 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1710 * @substream: the PCM substream instance 1711 * @file: file to refer f_flags 1712 * 1713 * Return: Zero if successful, or a negative error code. 1714 */ 1715 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1716 struct file *file) 1717 { 1718 int f_flags; 1719 1720 if (file) 1721 f_flags = file->f_flags; 1722 else 1723 f_flags = substream->f_flags; 1724 1725 snd_pcm_stream_lock_irq(substream); 1726 switch (substream->runtime->status->state) { 1727 case SNDRV_PCM_STATE_PAUSED: 1728 snd_pcm_pause(substream, 0); 1729 /* fallthru */ 1730 case SNDRV_PCM_STATE_SUSPENDED: 1731 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1732 break; 1733 } 1734 snd_pcm_stream_unlock_irq(substream); 1735 1736 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1737 substream, f_flags); 1738 } 1739 1740 /* 1741 * drain ioctl 1742 */ 1743 1744 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1745 { 1746 struct snd_pcm_runtime *runtime = substream->runtime; 1747 switch (runtime->status->state) { 1748 case SNDRV_PCM_STATE_OPEN: 1749 case SNDRV_PCM_STATE_DISCONNECTED: 1750 case SNDRV_PCM_STATE_SUSPENDED: 1751 return -EBADFD; 1752 } 1753 runtime->trigger_master = substream; 1754 return 0; 1755 } 1756 1757 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1758 { 1759 struct snd_pcm_runtime *runtime = substream->runtime; 1760 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1761 switch (runtime->status->state) { 1762 case SNDRV_PCM_STATE_PREPARED: 1763 /* start playback stream if possible */ 1764 if (! snd_pcm_playback_empty(substream)) { 1765 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1766 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1767 } else { 1768 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1769 } 1770 break; 1771 case SNDRV_PCM_STATE_RUNNING: 1772 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1773 break; 1774 case SNDRV_PCM_STATE_XRUN: 1775 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1776 break; 1777 default: 1778 break; 1779 } 1780 } else { 1781 /* stop running stream */ 1782 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1783 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1784 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1785 snd_pcm_do_stop(substream, new_state); 1786 snd_pcm_post_stop(substream, new_state); 1787 } 1788 } 1789 1790 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1791 runtime->trigger_master == substream && 1792 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1793 return substream->ops->trigger(substream, 1794 SNDRV_PCM_TRIGGER_DRAIN); 1795 1796 return 0; 1797 } 1798 1799 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1800 { 1801 } 1802 1803 static const struct action_ops snd_pcm_action_drain_init = { 1804 .pre_action = snd_pcm_pre_drain_init, 1805 .do_action = snd_pcm_do_drain_init, 1806 .post_action = snd_pcm_post_drain_init 1807 }; 1808 1809 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1810 1811 /* 1812 * Drain the stream(s). 1813 * When the substream is linked, sync until the draining of all playback streams 1814 * is finished. 1815 * After this call, all streams are supposed to be either SETUP or DRAINING 1816 * (capture only) state. 1817 */ 1818 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1819 struct file *file) 1820 { 1821 struct snd_card *card; 1822 struct snd_pcm_runtime *runtime; 1823 struct snd_pcm_substream *s; 1824 wait_queue_entry_t wait; 1825 int result = 0; 1826 int nonblock = 0; 1827 1828 card = substream->pcm->card; 1829 runtime = substream->runtime; 1830 1831 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1832 return -EBADFD; 1833 1834 if (file) { 1835 if (file->f_flags & O_NONBLOCK) 1836 nonblock = 1; 1837 } else if (substream->f_flags & O_NONBLOCK) 1838 nonblock = 1; 1839 1840 down_read(&snd_pcm_link_rwsem); 1841 snd_pcm_stream_lock_irq(substream); 1842 /* resume pause */ 1843 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1844 snd_pcm_pause(substream, 0); 1845 1846 /* pre-start/stop - all running streams are changed to DRAINING state */ 1847 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1848 if (result < 0) 1849 goto unlock; 1850 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1851 if (nonblock) { 1852 result = -EAGAIN; 1853 goto unlock; 1854 } 1855 1856 for (;;) { 1857 long tout; 1858 struct snd_pcm_runtime *to_check; 1859 if (signal_pending(current)) { 1860 result = -ERESTARTSYS; 1861 break; 1862 } 1863 /* find a substream to drain */ 1864 to_check = NULL; 1865 snd_pcm_group_for_each_entry(s, substream) { 1866 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1867 continue; 1868 runtime = s->runtime; 1869 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1870 to_check = runtime; 1871 break; 1872 } 1873 } 1874 if (!to_check) 1875 break; /* all drained */ 1876 init_waitqueue_entry(&wait, current); 1877 add_wait_queue(&to_check->sleep, &wait); 1878 snd_pcm_stream_unlock_irq(substream); 1879 up_read(&snd_pcm_link_rwsem); 1880 if (runtime->no_period_wakeup) 1881 tout = MAX_SCHEDULE_TIMEOUT; 1882 else { 1883 tout = 10; 1884 if (runtime->rate) { 1885 long t = runtime->period_size * 2 / runtime->rate; 1886 tout = max(t, tout); 1887 } 1888 tout = msecs_to_jiffies(tout * 1000); 1889 } 1890 tout = schedule_timeout_interruptible(tout); 1891 down_read(&snd_pcm_link_rwsem); 1892 snd_pcm_stream_lock_irq(substream); 1893 remove_wait_queue(&to_check->sleep, &wait); 1894 if (card->shutdown) { 1895 result = -ENODEV; 1896 break; 1897 } 1898 if (tout == 0) { 1899 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1900 result = -ESTRPIPE; 1901 else { 1902 dev_dbg(substream->pcm->card->dev, 1903 "playback drain error (DMA or IRQ trouble?)\n"); 1904 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1905 result = -EIO; 1906 } 1907 break; 1908 } 1909 } 1910 1911 unlock: 1912 snd_pcm_stream_unlock_irq(substream); 1913 up_read(&snd_pcm_link_rwsem); 1914 1915 return result; 1916 } 1917 1918 /* 1919 * drop ioctl 1920 * 1921 * Immediately put all linked substreams into SETUP state. 1922 */ 1923 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1924 { 1925 struct snd_pcm_runtime *runtime; 1926 int result = 0; 1927 1928 if (PCM_RUNTIME_CHECK(substream)) 1929 return -ENXIO; 1930 runtime = substream->runtime; 1931 1932 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1933 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1934 return -EBADFD; 1935 1936 snd_pcm_stream_lock_irq(substream); 1937 /* resume pause */ 1938 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1939 snd_pcm_pause(substream, 0); 1940 1941 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1942 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1943 snd_pcm_stream_unlock_irq(substream); 1944 1945 return result; 1946 } 1947 1948 1949 static bool is_pcm_file(struct file *file) 1950 { 1951 struct inode *inode = file_inode(file); 1952 struct snd_pcm *pcm; 1953 unsigned int minor; 1954 1955 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1956 return false; 1957 minor = iminor(inode); 1958 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 1959 if (!pcm) 1960 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1961 if (!pcm) 1962 return false; 1963 snd_card_unref(pcm->card); 1964 return true; 1965 } 1966 1967 /* 1968 * PCM link handling 1969 */ 1970 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1971 { 1972 int res = 0; 1973 struct snd_pcm_file *pcm_file; 1974 struct snd_pcm_substream *substream1; 1975 struct snd_pcm_group *group; 1976 struct fd f = fdget(fd); 1977 1978 if (!f.file) 1979 return -EBADFD; 1980 if (!is_pcm_file(f.file)) { 1981 res = -EBADFD; 1982 goto _badf; 1983 } 1984 pcm_file = f.file->private_data; 1985 substream1 = pcm_file->substream; 1986 group = kzalloc(sizeof(*group), GFP_KERNEL); 1987 if (!group) { 1988 res = -ENOMEM; 1989 goto _nolock; 1990 } 1991 snd_pcm_group_init(group); 1992 down_write_nonfifo(&snd_pcm_link_rwsem); 1993 write_lock_irq(&snd_pcm_link_rwlock); 1994 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1995 substream->runtime->status->state != substream1->runtime->status->state || 1996 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1997 res = -EBADFD; 1998 goto _end; 1999 } 2000 if (snd_pcm_stream_linked(substream1)) { 2001 res = -EALREADY; 2002 goto _end; 2003 } 2004 if (!snd_pcm_stream_linked(substream)) { 2005 snd_pcm_group_assign(substream, group); 2006 group = NULL; 2007 } 2008 snd_pcm_group_assign(substream1, substream->group); 2009 _end: 2010 write_unlock_irq(&snd_pcm_link_rwlock); 2011 up_write(&snd_pcm_link_rwsem); 2012 _nolock: 2013 kfree(group); 2014 _badf: 2015 fdput(f); 2016 return res; 2017 } 2018 2019 static void relink_to_local(struct snd_pcm_substream *substream) 2020 { 2021 snd_pcm_group_assign(substream, &substream->self_group); 2022 } 2023 2024 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2025 { 2026 struct snd_pcm_group *group; 2027 int res = 0; 2028 2029 down_write_nonfifo(&snd_pcm_link_rwsem); 2030 write_lock_irq(&snd_pcm_link_rwlock); 2031 if (!snd_pcm_stream_linked(substream)) { 2032 res = -EALREADY; 2033 goto _end; 2034 } 2035 2036 group = substream->group; 2037 2038 relink_to_local(substream); 2039 2040 /* detach the last stream, too */ 2041 if (list_is_singular(&group->substreams)) { 2042 relink_to_local(list_first_entry(&group->substreams, 2043 struct snd_pcm_substream, 2044 link_list)); 2045 kfree(group); 2046 } 2047 2048 _end: 2049 write_unlock_irq(&snd_pcm_link_rwlock); 2050 up_write(&snd_pcm_link_rwsem); 2051 return res; 2052 } 2053 2054 /* 2055 * hw configurator 2056 */ 2057 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2058 struct snd_pcm_hw_rule *rule) 2059 { 2060 struct snd_interval t; 2061 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2062 hw_param_interval_c(params, rule->deps[1]), &t); 2063 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2064 } 2065 2066 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2067 struct snd_pcm_hw_rule *rule) 2068 { 2069 struct snd_interval t; 2070 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2071 hw_param_interval_c(params, rule->deps[1]), &t); 2072 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2073 } 2074 2075 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2076 struct snd_pcm_hw_rule *rule) 2077 { 2078 struct snd_interval t; 2079 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2080 hw_param_interval_c(params, rule->deps[1]), 2081 (unsigned long) rule->private, &t); 2082 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2083 } 2084 2085 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2086 struct snd_pcm_hw_rule *rule) 2087 { 2088 struct snd_interval t; 2089 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2090 (unsigned long) rule->private, 2091 hw_param_interval_c(params, rule->deps[1]), &t); 2092 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2093 } 2094 2095 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2096 struct snd_pcm_hw_rule *rule) 2097 { 2098 unsigned int k; 2099 const struct snd_interval *i = 2100 hw_param_interval_c(params, rule->deps[0]); 2101 struct snd_mask m; 2102 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2103 snd_mask_any(&m); 2104 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2105 int bits; 2106 if (! snd_mask_test(mask, k)) 2107 continue; 2108 bits = snd_pcm_format_physical_width(k); 2109 if (bits <= 0) 2110 continue; /* ignore invalid formats */ 2111 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2112 snd_mask_reset(&m, k); 2113 } 2114 return snd_mask_refine(mask, &m); 2115 } 2116 2117 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2118 struct snd_pcm_hw_rule *rule) 2119 { 2120 struct snd_interval t; 2121 unsigned int k; 2122 t.min = UINT_MAX; 2123 t.max = 0; 2124 t.openmin = 0; 2125 t.openmax = 0; 2126 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2127 int bits; 2128 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2129 continue; 2130 bits = snd_pcm_format_physical_width(k); 2131 if (bits <= 0) 2132 continue; /* ignore invalid formats */ 2133 if (t.min > (unsigned)bits) 2134 t.min = bits; 2135 if (t.max < (unsigned)bits) 2136 t.max = bits; 2137 } 2138 t.integer = 1; 2139 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2140 } 2141 2142 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2143 #error "Change this table" 2144 #endif 2145 2146 static const unsigned int rates[] = { 2147 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2148 48000, 64000, 88200, 96000, 176400, 192000 2149 }; 2150 2151 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2152 .count = ARRAY_SIZE(rates), 2153 .list = rates, 2154 }; 2155 2156 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2157 struct snd_pcm_hw_rule *rule) 2158 { 2159 struct snd_pcm_hardware *hw = rule->private; 2160 return snd_interval_list(hw_param_interval(params, rule->var), 2161 snd_pcm_known_rates.count, 2162 snd_pcm_known_rates.list, hw->rates); 2163 } 2164 2165 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2166 struct snd_pcm_hw_rule *rule) 2167 { 2168 struct snd_interval t; 2169 struct snd_pcm_substream *substream = rule->private; 2170 t.min = 0; 2171 t.max = substream->buffer_bytes_max; 2172 t.openmin = 0; 2173 t.openmax = 0; 2174 t.integer = 1; 2175 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2176 } 2177 2178 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2179 { 2180 struct snd_pcm_runtime *runtime = substream->runtime; 2181 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2182 int k, err; 2183 2184 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2185 snd_mask_any(constrs_mask(constrs, k)); 2186 } 2187 2188 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2189 snd_interval_any(constrs_interval(constrs, k)); 2190 } 2191 2192 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2193 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2194 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2195 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2196 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2197 2198 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2199 snd_pcm_hw_rule_format, NULL, 2200 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2201 if (err < 0) 2202 return err; 2203 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2204 snd_pcm_hw_rule_sample_bits, NULL, 2205 SNDRV_PCM_HW_PARAM_FORMAT, 2206 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2207 if (err < 0) 2208 return err; 2209 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2210 snd_pcm_hw_rule_div, NULL, 2211 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2212 if (err < 0) 2213 return err; 2214 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2215 snd_pcm_hw_rule_mul, NULL, 2216 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2217 if (err < 0) 2218 return err; 2219 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2220 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2221 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2222 if (err < 0) 2223 return err; 2224 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2225 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2226 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2227 if (err < 0) 2228 return err; 2229 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2230 snd_pcm_hw_rule_div, NULL, 2231 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2232 if (err < 0) 2233 return err; 2234 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2235 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2236 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2237 if (err < 0) 2238 return err; 2239 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2240 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2241 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2242 if (err < 0) 2243 return err; 2244 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2245 snd_pcm_hw_rule_div, NULL, 2246 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2247 if (err < 0) 2248 return err; 2249 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2250 snd_pcm_hw_rule_div, NULL, 2251 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2252 if (err < 0) 2253 return err; 2254 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2255 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2256 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2257 if (err < 0) 2258 return err; 2259 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2260 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2261 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2262 if (err < 0) 2263 return err; 2264 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2265 snd_pcm_hw_rule_mul, NULL, 2266 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2267 if (err < 0) 2268 return err; 2269 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2270 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2271 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2272 if (err < 0) 2273 return err; 2274 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2275 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2276 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2277 if (err < 0) 2278 return err; 2279 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2280 snd_pcm_hw_rule_muldivk, (void*) 8, 2281 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2282 if (err < 0) 2283 return err; 2284 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2285 snd_pcm_hw_rule_muldivk, (void*) 8, 2286 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2287 if (err < 0) 2288 return err; 2289 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2290 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2291 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2292 if (err < 0) 2293 return err; 2294 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2295 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2296 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2297 if (err < 0) 2298 return err; 2299 return 0; 2300 } 2301 2302 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2303 { 2304 struct snd_pcm_runtime *runtime = substream->runtime; 2305 struct snd_pcm_hardware *hw = &runtime->hw; 2306 int err; 2307 unsigned int mask = 0; 2308 2309 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2310 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2311 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2312 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2313 if (hw_support_mmap(substream)) { 2314 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2315 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2316 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2317 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2318 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2319 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2320 } 2321 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2322 if (err < 0) 2323 return err; 2324 2325 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2326 if (err < 0) 2327 return err; 2328 2329 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2330 if (err < 0) 2331 return err; 2332 2333 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2334 hw->channels_min, hw->channels_max); 2335 if (err < 0) 2336 return err; 2337 2338 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2339 hw->rate_min, hw->rate_max); 2340 if (err < 0) 2341 return err; 2342 2343 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2344 hw->period_bytes_min, hw->period_bytes_max); 2345 if (err < 0) 2346 return err; 2347 2348 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2349 hw->periods_min, hw->periods_max); 2350 if (err < 0) 2351 return err; 2352 2353 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2354 hw->period_bytes_min, hw->buffer_bytes_max); 2355 if (err < 0) 2356 return err; 2357 2358 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2359 snd_pcm_hw_rule_buffer_bytes_max, substream, 2360 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2361 if (err < 0) 2362 return err; 2363 2364 /* FIXME: remove */ 2365 if (runtime->dma_bytes) { 2366 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2367 if (err < 0) 2368 return err; 2369 } 2370 2371 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2372 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2373 snd_pcm_hw_rule_rate, hw, 2374 SNDRV_PCM_HW_PARAM_RATE, -1); 2375 if (err < 0) 2376 return err; 2377 } 2378 2379 /* FIXME: this belong to lowlevel */ 2380 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2381 2382 return 0; 2383 } 2384 2385 static void pcm_release_private(struct snd_pcm_substream *substream) 2386 { 2387 if (snd_pcm_stream_linked(substream)) 2388 snd_pcm_unlink(substream); 2389 } 2390 2391 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2392 { 2393 substream->ref_count--; 2394 if (substream->ref_count > 0) 2395 return; 2396 2397 snd_pcm_drop(substream); 2398 if (substream->hw_opened) { 2399 if (substream->ops->hw_free && 2400 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2401 substream->ops->hw_free(substream); 2402 substream->ops->close(substream); 2403 substream->hw_opened = 0; 2404 } 2405 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2406 pm_qos_remove_request(&substream->latency_pm_qos_req); 2407 if (substream->pcm_release) { 2408 substream->pcm_release(substream); 2409 substream->pcm_release = NULL; 2410 } 2411 snd_pcm_detach_substream(substream); 2412 } 2413 EXPORT_SYMBOL(snd_pcm_release_substream); 2414 2415 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2416 struct file *file, 2417 struct snd_pcm_substream **rsubstream) 2418 { 2419 struct snd_pcm_substream *substream; 2420 int err; 2421 2422 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2423 if (err < 0) 2424 return err; 2425 if (substream->ref_count > 1) { 2426 *rsubstream = substream; 2427 return 0; 2428 } 2429 2430 err = snd_pcm_hw_constraints_init(substream); 2431 if (err < 0) { 2432 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2433 goto error; 2434 } 2435 2436 if ((err = substream->ops->open(substream)) < 0) 2437 goto error; 2438 2439 substream->hw_opened = 1; 2440 2441 err = snd_pcm_hw_constraints_complete(substream); 2442 if (err < 0) { 2443 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2444 goto error; 2445 } 2446 2447 *rsubstream = substream; 2448 return 0; 2449 2450 error: 2451 snd_pcm_release_substream(substream); 2452 return err; 2453 } 2454 EXPORT_SYMBOL(snd_pcm_open_substream); 2455 2456 static int snd_pcm_open_file(struct file *file, 2457 struct snd_pcm *pcm, 2458 int stream) 2459 { 2460 struct snd_pcm_file *pcm_file; 2461 struct snd_pcm_substream *substream; 2462 int err; 2463 2464 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2465 if (err < 0) 2466 return err; 2467 2468 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2469 if (pcm_file == NULL) { 2470 snd_pcm_release_substream(substream); 2471 return -ENOMEM; 2472 } 2473 pcm_file->substream = substream; 2474 if (substream->ref_count == 1) { 2475 substream->file = pcm_file; 2476 substream->pcm_release = pcm_release_private; 2477 } 2478 file->private_data = pcm_file; 2479 2480 return 0; 2481 } 2482 2483 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2484 { 2485 struct snd_pcm *pcm; 2486 int err = nonseekable_open(inode, file); 2487 if (err < 0) 2488 return err; 2489 pcm = snd_lookup_minor_data(iminor(inode), 2490 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2491 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2492 if (pcm) 2493 snd_card_unref(pcm->card); 2494 return err; 2495 } 2496 2497 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2498 { 2499 struct snd_pcm *pcm; 2500 int err = nonseekable_open(inode, file); 2501 if (err < 0) 2502 return err; 2503 pcm = snd_lookup_minor_data(iminor(inode), 2504 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2505 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2506 if (pcm) 2507 snd_card_unref(pcm->card); 2508 return err; 2509 } 2510 2511 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2512 { 2513 int err; 2514 wait_queue_entry_t wait; 2515 2516 if (pcm == NULL) { 2517 err = -ENODEV; 2518 goto __error1; 2519 } 2520 err = snd_card_file_add(pcm->card, file); 2521 if (err < 0) 2522 goto __error1; 2523 if (!try_module_get(pcm->card->module)) { 2524 err = -EFAULT; 2525 goto __error2; 2526 } 2527 init_waitqueue_entry(&wait, current); 2528 add_wait_queue(&pcm->open_wait, &wait); 2529 mutex_lock(&pcm->open_mutex); 2530 while (1) { 2531 err = snd_pcm_open_file(file, pcm, stream); 2532 if (err >= 0) 2533 break; 2534 if (err == -EAGAIN) { 2535 if (file->f_flags & O_NONBLOCK) { 2536 err = -EBUSY; 2537 break; 2538 } 2539 } else 2540 break; 2541 set_current_state(TASK_INTERRUPTIBLE); 2542 mutex_unlock(&pcm->open_mutex); 2543 schedule(); 2544 mutex_lock(&pcm->open_mutex); 2545 if (pcm->card->shutdown) { 2546 err = -ENODEV; 2547 break; 2548 } 2549 if (signal_pending(current)) { 2550 err = -ERESTARTSYS; 2551 break; 2552 } 2553 } 2554 remove_wait_queue(&pcm->open_wait, &wait); 2555 mutex_unlock(&pcm->open_mutex); 2556 if (err < 0) 2557 goto __error; 2558 return err; 2559 2560 __error: 2561 module_put(pcm->card->module); 2562 __error2: 2563 snd_card_file_remove(pcm->card, file); 2564 __error1: 2565 return err; 2566 } 2567 2568 static int snd_pcm_release(struct inode *inode, struct file *file) 2569 { 2570 struct snd_pcm *pcm; 2571 struct snd_pcm_substream *substream; 2572 struct snd_pcm_file *pcm_file; 2573 2574 pcm_file = file->private_data; 2575 substream = pcm_file->substream; 2576 if (snd_BUG_ON(!substream)) 2577 return -ENXIO; 2578 pcm = substream->pcm; 2579 mutex_lock(&pcm->open_mutex); 2580 snd_pcm_release_substream(substream); 2581 kfree(pcm_file); 2582 mutex_unlock(&pcm->open_mutex); 2583 wake_up(&pcm->open_wait); 2584 module_put(pcm->card->module); 2585 snd_card_file_remove(pcm->card, file); 2586 return 0; 2587 } 2588 2589 /* check and update PCM state; return 0 or a negative error 2590 * call this inside PCM lock 2591 */ 2592 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2593 { 2594 switch (substream->runtime->status->state) { 2595 case SNDRV_PCM_STATE_DRAINING: 2596 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2597 return -EBADFD; 2598 /* Fall through */ 2599 case SNDRV_PCM_STATE_RUNNING: 2600 return snd_pcm_update_hw_ptr(substream); 2601 case SNDRV_PCM_STATE_PREPARED: 2602 case SNDRV_PCM_STATE_PAUSED: 2603 return 0; 2604 case SNDRV_PCM_STATE_SUSPENDED: 2605 return -ESTRPIPE; 2606 case SNDRV_PCM_STATE_XRUN: 2607 return -EPIPE; 2608 default: 2609 return -EBADFD; 2610 } 2611 } 2612 2613 /* increase the appl_ptr; returns the processed frames or a negative error */ 2614 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2615 snd_pcm_uframes_t frames, 2616 snd_pcm_sframes_t avail) 2617 { 2618 struct snd_pcm_runtime *runtime = substream->runtime; 2619 snd_pcm_sframes_t appl_ptr; 2620 int ret; 2621 2622 if (avail <= 0) 2623 return 0; 2624 if (frames > (snd_pcm_uframes_t)avail) 2625 frames = avail; 2626 appl_ptr = runtime->control->appl_ptr + frames; 2627 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2628 appl_ptr -= runtime->boundary; 2629 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2630 return ret < 0 ? ret : frames; 2631 } 2632 2633 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2634 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2635 snd_pcm_uframes_t frames, 2636 snd_pcm_sframes_t avail) 2637 { 2638 struct snd_pcm_runtime *runtime = substream->runtime; 2639 snd_pcm_sframes_t appl_ptr; 2640 int ret; 2641 2642 if (avail <= 0) 2643 return 0; 2644 if (frames > (snd_pcm_uframes_t)avail) 2645 frames = avail; 2646 appl_ptr = runtime->control->appl_ptr - frames; 2647 if (appl_ptr < 0) 2648 appl_ptr += runtime->boundary; 2649 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2650 /* NOTE: we return zero for errors because PulseAudio gets depressed 2651 * upon receiving an error from rewind ioctl and stops processing 2652 * any longer. Returning zero means that no rewind is done, so 2653 * it's not absolutely wrong to answer like that. 2654 */ 2655 return ret < 0 ? 0 : frames; 2656 } 2657 2658 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2659 snd_pcm_uframes_t frames) 2660 { 2661 snd_pcm_sframes_t ret; 2662 2663 if (frames == 0) 2664 return 0; 2665 2666 snd_pcm_stream_lock_irq(substream); 2667 ret = do_pcm_hwsync(substream); 2668 if (!ret) 2669 ret = rewind_appl_ptr(substream, frames, 2670 snd_pcm_hw_avail(substream)); 2671 snd_pcm_stream_unlock_irq(substream); 2672 return ret; 2673 } 2674 2675 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2676 snd_pcm_uframes_t frames) 2677 { 2678 snd_pcm_sframes_t ret; 2679 2680 if (frames == 0) 2681 return 0; 2682 2683 snd_pcm_stream_lock_irq(substream); 2684 ret = do_pcm_hwsync(substream); 2685 if (!ret) 2686 ret = forward_appl_ptr(substream, frames, 2687 snd_pcm_avail(substream)); 2688 snd_pcm_stream_unlock_irq(substream); 2689 return ret; 2690 } 2691 2692 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2693 { 2694 int err; 2695 2696 snd_pcm_stream_lock_irq(substream); 2697 err = do_pcm_hwsync(substream); 2698 snd_pcm_stream_unlock_irq(substream); 2699 return err; 2700 } 2701 2702 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2703 snd_pcm_sframes_t *delay) 2704 { 2705 int err; 2706 snd_pcm_sframes_t n = 0; 2707 2708 snd_pcm_stream_lock_irq(substream); 2709 err = do_pcm_hwsync(substream); 2710 if (!err) 2711 n = snd_pcm_calc_delay(substream); 2712 snd_pcm_stream_unlock_irq(substream); 2713 if (!err) 2714 *delay = n; 2715 return err; 2716 } 2717 2718 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2719 struct snd_pcm_sync_ptr __user *_sync_ptr) 2720 { 2721 struct snd_pcm_runtime *runtime = substream->runtime; 2722 struct snd_pcm_sync_ptr sync_ptr; 2723 volatile struct snd_pcm_mmap_status *status; 2724 volatile struct snd_pcm_mmap_control *control; 2725 int err; 2726 2727 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2728 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2729 return -EFAULT; 2730 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2731 return -EFAULT; 2732 status = runtime->status; 2733 control = runtime->control; 2734 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2735 err = snd_pcm_hwsync(substream); 2736 if (err < 0) 2737 return err; 2738 } 2739 snd_pcm_stream_lock_irq(substream); 2740 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2741 err = pcm_lib_apply_appl_ptr(substream, 2742 sync_ptr.c.control.appl_ptr); 2743 if (err < 0) { 2744 snd_pcm_stream_unlock_irq(substream); 2745 return err; 2746 } 2747 } else { 2748 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2749 } 2750 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2751 control->avail_min = sync_ptr.c.control.avail_min; 2752 else 2753 sync_ptr.c.control.avail_min = control->avail_min; 2754 sync_ptr.s.status.state = status->state; 2755 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2756 sync_ptr.s.status.tstamp = status->tstamp; 2757 sync_ptr.s.status.suspended_state = status->suspended_state; 2758 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2759 snd_pcm_stream_unlock_irq(substream); 2760 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2761 return -EFAULT; 2762 return 0; 2763 } 2764 2765 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2766 { 2767 struct snd_pcm_runtime *runtime = substream->runtime; 2768 int arg; 2769 2770 if (get_user(arg, _arg)) 2771 return -EFAULT; 2772 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2773 return -EINVAL; 2774 runtime->tstamp_type = arg; 2775 return 0; 2776 } 2777 2778 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2779 struct snd_xferi __user *_xferi) 2780 { 2781 struct snd_xferi xferi; 2782 struct snd_pcm_runtime *runtime = substream->runtime; 2783 snd_pcm_sframes_t result; 2784 2785 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2786 return -EBADFD; 2787 if (put_user(0, &_xferi->result)) 2788 return -EFAULT; 2789 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2790 return -EFAULT; 2791 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2792 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2793 else 2794 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2795 __put_user(result, &_xferi->result); 2796 return result < 0 ? result : 0; 2797 } 2798 2799 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2800 struct snd_xfern __user *_xfern) 2801 { 2802 struct snd_xfern xfern; 2803 struct snd_pcm_runtime *runtime = substream->runtime; 2804 void *bufs; 2805 snd_pcm_sframes_t result; 2806 2807 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2808 return -EBADFD; 2809 if (runtime->channels > 128) 2810 return -EINVAL; 2811 if (put_user(0, &_xfern->result)) 2812 return -EFAULT; 2813 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2814 return -EFAULT; 2815 2816 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2817 if (IS_ERR(bufs)) 2818 return PTR_ERR(bufs); 2819 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2820 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2821 else 2822 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2823 kfree(bufs); 2824 __put_user(result, &_xfern->result); 2825 return result < 0 ? result : 0; 2826 } 2827 2828 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2829 snd_pcm_uframes_t __user *_frames) 2830 { 2831 snd_pcm_uframes_t frames; 2832 snd_pcm_sframes_t result; 2833 2834 if (get_user(frames, _frames)) 2835 return -EFAULT; 2836 if (put_user(0, _frames)) 2837 return -EFAULT; 2838 result = snd_pcm_rewind(substream, frames); 2839 __put_user(result, _frames); 2840 return result < 0 ? result : 0; 2841 } 2842 2843 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2844 snd_pcm_uframes_t __user *_frames) 2845 { 2846 snd_pcm_uframes_t frames; 2847 snd_pcm_sframes_t result; 2848 2849 if (get_user(frames, _frames)) 2850 return -EFAULT; 2851 if (put_user(0, _frames)) 2852 return -EFAULT; 2853 result = snd_pcm_forward(substream, frames); 2854 __put_user(result, _frames); 2855 return result < 0 ? result : 0; 2856 } 2857 2858 static int snd_pcm_common_ioctl(struct file *file, 2859 struct snd_pcm_substream *substream, 2860 unsigned int cmd, void __user *arg) 2861 { 2862 struct snd_pcm_file *pcm_file = file->private_data; 2863 int res; 2864 2865 if (PCM_RUNTIME_CHECK(substream)) 2866 return -ENXIO; 2867 2868 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2869 if (res < 0) 2870 return res; 2871 2872 switch (cmd) { 2873 case SNDRV_PCM_IOCTL_PVERSION: 2874 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2875 case SNDRV_PCM_IOCTL_INFO: 2876 return snd_pcm_info_user(substream, arg); 2877 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2878 return 0; 2879 case SNDRV_PCM_IOCTL_TTSTAMP: 2880 return snd_pcm_tstamp(substream, arg); 2881 case SNDRV_PCM_IOCTL_USER_PVERSION: 2882 if (get_user(pcm_file->user_pversion, 2883 (unsigned int __user *)arg)) 2884 return -EFAULT; 2885 return 0; 2886 case SNDRV_PCM_IOCTL_HW_REFINE: 2887 return snd_pcm_hw_refine_user(substream, arg); 2888 case SNDRV_PCM_IOCTL_HW_PARAMS: 2889 return snd_pcm_hw_params_user(substream, arg); 2890 case SNDRV_PCM_IOCTL_HW_FREE: 2891 return snd_pcm_hw_free(substream); 2892 case SNDRV_PCM_IOCTL_SW_PARAMS: 2893 return snd_pcm_sw_params_user(substream, arg); 2894 case SNDRV_PCM_IOCTL_STATUS: 2895 return snd_pcm_status_user(substream, arg, false); 2896 case SNDRV_PCM_IOCTL_STATUS_EXT: 2897 return snd_pcm_status_user(substream, arg, true); 2898 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2899 return snd_pcm_channel_info_user(substream, arg); 2900 case SNDRV_PCM_IOCTL_PREPARE: 2901 return snd_pcm_prepare(substream, file); 2902 case SNDRV_PCM_IOCTL_RESET: 2903 return snd_pcm_reset(substream); 2904 case SNDRV_PCM_IOCTL_START: 2905 return snd_pcm_start_lock_irq(substream); 2906 case SNDRV_PCM_IOCTL_LINK: 2907 return snd_pcm_link(substream, (int)(unsigned long) arg); 2908 case SNDRV_PCM_IOCTL_UNLINK: 2909 return snd_pcm_unlink(substream); 2910 case SNDRV_PCM_IOCTL_RESUME: 2911 return snd_pcm_resume(substream); 2912 case SNDRV_PCM_IOCTL_XRUN: 2913 return snd_pcm_xrun(substream); 2914 case SNDRV_PCM_IOCTL_HWSYNC: 2915 return snd_pcm_hwsync(substream); 2916 case SNDRV_PCM_IOCTL_DELAY: 2917 { 2918 snd_pcm_sframes_t delay; 2919 snd_pcm_sframes_t __user *res = arg; 2920 int err; 2921 2922 err = snd_pcm_delay(substream, &delay); 2923 if (err) 2924 return err; 2925 if (put_user(delay, res)) 2926 return -EFAULT; 2927 return 0; 2928 } 2929 case SNDRV_PCM_IOCTL_SYNC_PTR: 2930 return snd_pcm_sync_ptr(substream, arg); 2931 #ifdef CONFIG_SND_SUPPORT_OLD_API 2932 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2933 return snd_pcm_hw_refine_old_user(substream, arg); 2934 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2935 return snd_pcm_hw_params_old_user(substream, arg); 2936 #endif 2937 case SNDRV_PCM_IOCTL_DRAIN: 2938 return snd_pcm_drain(substream, file); 2939 case SNDRV_PCM_IOCTL_DROP: 2940 return snd_pcm_drop(substream); 2941 case SNDRV_PCM_IOCTL_PAUSE: 2942 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2943 substream, 2944 (int)(unsigned long)arg); 2945 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2946 case SNDRV_PCM_IOCTL_READI_FRAMES: 2947 return snd_pcm_xferi_frames_ioctl(substream, arg); 2948 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2949 case SNDRV_PCM_IOCTL_READN_FRAMES: 2950 return snd_pcm_xfern_frames_ioctl(substream, arg); 2951 case SNDRV_PCM_IOCTL_REWIND: 2952 return snd_pcm_rewind_ioctl(substream, arg); 2953 case SNDRV_PCM_IOCTL_FORWARD: 2954 return snd_pcm_forward_ioctl(substream, arg); 2955 } 2956 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2957 return -ENOTTY; 2958 } 2959 2960 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2961 unsigned long arg) 2962 { 2963 struct snd_pcm_file *pcm_file; 2964 2965 pcm_file = file->private_data; 2966 2967 if (((cmd >> 8) & 0xff) != 'A') 2968 return -ENOTTY; 2969 2970 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2971 (void __user *)arg); 2972 } 2973 2974 /** 2975 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2976 * @substream: PCM substream 2977 * @cmd: IOCTL cmd 2978 * @arg: IOCTL argument 2979 * 2980 * The function is provided primarily for OSS layer and USB gadget drivers, 2981 * and it allows only the limited set of ioctls (hw_params, sw_params, 2982 * prepare, start, drain, drop, forward). 2983 */ 2984 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2985 unsigned int cmd, void *arg) 2986 { 2987 snd_pcm_uframes_t *frames = arg; 2988 snd_pcm_sframes_t result; 2989 2990 switch (cmd) { 2991 case SNDRV_PCM_IOCTL_FORWARD: 2992 { 2993 /* provided only for OSS; capture-only and no value returned */ 2994 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 2995 return -EINVAL; 2996 result = snd_pcm_forward(substream, *frames); 2997 return result < 0 ? result : 0; 2998 } 2999 case SNDRV_PCM_IOCTL_HW_PARAMS: 3000 return snd_pcm_hw_params(substream, arg); 3001 case SNDRV_PCM_IOCTL_SW_PARAMS: 3002 return snd_pcm_sw_params(substream, arg); 3003 case SNDRV_PCM_IOCTL_PREPARE: 3004 return snd_pcm_prepare(substream, NULL); 3005 case SNDRV_PCM_IOCTL_START: 3006 return snd_pcm_start_lock_irq(substream); 3007 case SNDRV_PCM_IOCTL_DRAIN: 3008 return snd_pcm_drain(substream, NULL); 3009 case SNDRV_PCM_IOCTL_DROP: 3010 return snd_pcm_drop(substream); 3011 case SNDRV_PCM_IOCTL_DELAY: 3012 return snd_pcm_delay(substream, frames); 3013 default: 3014 return -EINVAL; 3015 } 3016 } 3017 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3018 3019 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3020 loff_t * offset) 3021 { 3022 struct snd_pcm_file *pcm_file; 3023 struct snd_pcm_substream *substream; 3024 struct snd_pcm_runtime *runtime; 3025 snd_pcm_sframes_t result; 3026 3027 pcm_file = file->private_data; 3028 substream = pcm_file->substream; 3029 if (PCM_RUNTIME_CHECK(substream)) 3030 return -ENXIO; 3031 runtime = substream->runtime; 3032 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3033 return -EBADFD; 3034 if (!frame_aligned(runtime, count)) 3035 return -EINVAL; 3036 count = bytes_to_frames(runtime, count); 3037 result = snd_pcm_lib_read(substream, buf, count); 3038 if (result > 0) 3039 result = frames_to_bytes(runtime, result); 3040 return result; 3041 } 3042 3043 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3044 size_t count, loff_t * offset) 3045 { 3046 struct snd_pcm_file *pcm_file; 3047 struct snd_pcm_substream *substream; 3048 struct snd_pcm_runtime *runtime; 3049 snd_pcm_sframes_t result; 3050 3051 pcm_file = file->private_data; 3052 substream = pcm_file->substream; 3053 if (PCM_RUNTIME_CHECK(substream)) 3054 return -ENXIO; 3055 runtime = substream->runtime; 3056 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3057 return -EBADFD; 3058 if (!frame_aligned(runtime, count)) 3059 return -EINVAL; 3060 count = bytes_to_frames(runtime, count); 3061 result = snd_pcm_lib_write(substream, buf, count); 3062 if (result > 0) 3063 result = frames_to_bytes(runtime, result); 3064 return result; 3065 } 3066 3067 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3068 { 3069 struct snd_pcm_file *pcm_file; 3070 struct snd_pcm_substream *substream; 3071 struct snd_pcm_runtime *runtime; 3072 snd_pcm_sframes_t result; 3073 unsigned long i; 3074 void __user **bufs; 3075 snd_pcm_uframes_t frames; 3076 3077 pcm_file = iocb->ki_filp->private_data; 3078 substream = pcm_file->substream; 3079 if (PCM_RUNTIME_CHECK(substream)) 3080 return -ENXIO; 3081 runtime = substream->runtime; 3082 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3083 return -EBADFD; 3084 if (!iter_is_iovec(to)) 3085 return -EINVAL; 3086 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3087 return -EINVAL; 3088 if (!frame_aligned(runtime, to->iov->iov_len)) 3089 return -EINVAL; 3090 frames = bytes_to_samples(runtime, to->iov->iov_len); 3091 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3092 if (bufs == NULL) 3093 return -ENOMEM; 3094 for (i = 0; i < to->nr_segs; ++i) 3095 bufs[i] = to->iov[i].iov_base; 3096 result = snd_pcm_lib_readv(substream, bufs, frames); 3097 if (result > 0) 3098 result = frames_to_bytes(runtime, result); 3099 kfree(bufs); 3100 return result; 3101 } 3102 3103 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3104 { 3105 struct snd_pcm_file *pcm_file; 3106 struct snd_pcm_substream *substream; 3107 struct snd_pcm_runtime *runtime; 3108 snd_pcm_sframes_t result; 3109 unsigned long i; 3110 void __user **bufs; 3111 snd_pcm_uframes_t frames; 3112 3113 pcm_file = iocb->ki_filp->private_data; 3114 substream = pcm_file->substream; 3115 if (PCM_RUNTIME_CHECK(substream)) 3116 return -ENXIO; 3117 runtime = substream->runtime; 3118 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3119 return -EBADFD; 3120 if (!iter_is_iovec(from)) 3121 return -EINVAL; 3122 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3123 !frame_aligned(runtime, from->iov->iov_len)) 3124 return -EINVAL; 3125 frames = bytes_to_samples(runtime, from->iov->iov_len); 3126 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3127 if (bufs == NULL) 3128 return -ENOMEM; 3129 for (i = 0; i < from->nr_segs; ++i) 3130 bufs[i] = from->iov[i].iov_base; 3131 result = snd_pcm_lib_writev(substream, bufs, frames); 3132 if (result > 0) 3133 result = frames_to_bytes(runtime, result); 3134 kfree(bufs); 3135 return result; 3136 } 3137 3138 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3139 { 3140 struct snd_pcm_file *pcm_file; 3141 struct snd_pcm_substream *substream; 3142 struct snd_pcm_runtime *runtime; 3143 __poll_t mask, ok; 3144 snd_pcm_uframes_t avail; 3145 3146 pcm_file = file->private_data; 3147 3148 substream = pcm_file->substream; 3149 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3150 ok = EPOLLOUT | EPOLLWRNORM; 3151 else 3152 ok = EPOLLIN | EPOLLRDNORM; 3153 if (PCM_RUNTIME_CHECK(substream)) 3154 return ok | EPOLLERR; 3155 3156 runtime = substream->runtime; 3157 poll_wait(file, &runtime->sleep, wait); 3158 3159 mask = 0; 3160 snd_pcm_stream_lock_irq(substream); 3161 avail = snd_pcm_avail(substream); 3162 switch (runtime->status->state) { 3163 case SNDRV_PCM_STATE_RUNNING: 3164 case SNDRV_PCM_STATE_PREPARED: 3165 case SNDRV_PCM_STATE_PAUSED: 3166 if (avail >= runtime->control->avail_min) 3167 mask = ok; 3168 break; 3169 case SNDRV_PCM_STATE_DRAINING: 3170 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3171 mask = ok; 3172 if (!avail) 3173 mask |= EPOLLERR; 3174 } 3175 break; 3176 default: 3177 mask = ok | EPOLLERR; 3178 break; 3179 } 3180 snd_pcm_stream_unlock_irq(substream); 3181 return mask; 3182 } 3183 3184 /* 3185 * mmap support 3186 */ 3187 3188 /* 3189 * Only on coherent architectures, we can mmap the status and the control records 3190 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3191 */ 3192 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3193 /* 3194 * mmap status record 3195 */ 3196 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3197 { 3198 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3199 struct snd_pcm_runtime *runtime; 3200 3201 if (substream == NULL) 3202 return VM_FAULT_SIGBUS; 3203 runtime = substream->runtime; 3204 vmf->page = virt_to_page(runtime->status); 3205 get_page(vmf->page); 3206 return 0; 3207 } 3208 3209 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3210 { 3211 .fault = snd_pcm_mmap_status_fault, 3212 }; 3213 3214 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3215 struct vm_area_struct *area) 3216 { 3217 long size; 3218 if (!(area->vm_flags & VM_READ)) 3219 return -EINVAL; 3220 size = area->vm_end - area->vm_start; 3221 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3222 return -EINVAL; 3223 area->vm_ops = &snd_pcm_vm_ops_status; 3224 area->vm_private_data = substream; 3225 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3226 return 0; 3227 } 3228 3229 /* 3230 * mmap control record 3231 */ 3232 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3233 { 3234 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3235 struct snd_pcm_runtime *runtime; 3236 3237 if (substream == NULL) 3238 return VM_FAULT_SIGBUS; 3239 runtime = substream->runtime; 3240 vmf->page = virt_to_page(runtime->control); 3241 get_page(vmf->page); 3242 return 0; 3243 } 3244 3245 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3246 { 3247 .fault = snd_pcm_mmap_control_fault, 3248 }; 3249 3250 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3251 struct vm_area_struct *area) 3252 { 3253 long size; 3254 if (!(area->vm_flags & VM_READ)) 3255 return -EINVAL; 3256 size = area->vm_end - area->vm_start; 3257 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3258 return -EINVAL; 3259 area->vm_ops = &snd_pcm_vm_ops_control; 3260 area->vm_private_data = substream; 3261 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3262 return 0; 3263 } 3264 3265 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3266 { 3267 if (pcm_file->no_compat_mmap) 3268 return false; 3269 /* See pcm_control_mmap_allowed() below. 3270 * Since older alsa-lib requires both status and control mmaps to be 3271 * coupled, we have to disable the status mmap for old alsa-lib, too. 3272 */ 3273 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3274 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3275 return false; 3276 return true; 3277 } 3278 3279 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3280 { 3281 if (pcm_file->no_compat_mmap) 3282 return false; 3283 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3284 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3285 * thus it effectively assures the manual update of appl_ptr. 3286 */ 3287 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3288 return false; 3289 return true; 3290 } 3291 3292 #else /* ! coherent mmap */ 3293 /* 3294 * don't support mmap for status and control records. 3295 */ 3296 #define pcm_status_mmap_allowed(pcm_file) false 3297 #define pcm_control_mmap_allowed(pcm_file) false 3298 3299 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3300 struct vm_area_struct *area) 3301 { 3302 return -ENXIO; 3303 } 3304 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3305 struct vm_area_struct *area) 3306 { 3307 return -ENXIO; 3308 } 3309 #endif /* coherent mmap */ 3310 3311 static inline struct page * 3312 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3313 { 3314 void *vaddr = substream->runtime->dma_area + ofs; 3315 return virt_to_page(vaddr); 3316 } 3317 3318 /* 3319 * fault callback for mmapping a RAM page 3320 */ 3321 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3322 { 3323 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3324 struct snd_pcm_runtime *runtime; 3325 unsigned long offset; 3326 struct page * page; 3327 size_t dma_bytes; 3328 3329 if (substream == NULL) 3330 return VM_FAULT_SIGBUS; 3331 runtime = substream->runtime; 3332 offset = vmf->pgoff << PAGE_SHIFT; 3333 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3334 if (offset > dma_bytes - PAGE_SIZE) 3335 return VM_FAULT_SIGBUS; 3336 if (substream->ops->page) 3337 page = substream->ops->page(substream, offset); 3338 else 3339 page = snd_pcm_default_page_ops(substream, offset); 3340 if (!page) 3341 return VM_FAULT_SIGBUS; 3342 get_page(page); 3343 vmf->page = page; 3344 return 0; 3345 } 3346 3347 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3348 .open = snd_pcm_mmap_data_open, 3349 .close = snd_pcm_mmap_data_close, 3350 }; 3351 3352 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3353 .open = snd_pcm_mmap_data_open, 3354 .close = snd_pcm_mmap_data_close, 3355 .fault = snd_pcm_mmap_data_fault, 3356 }; 3357 3358 /* 3359 * mmap the DMA buffer on RAM 3360 */ 3361 3362 /** 3363 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3364 * @substream: PCM substream 3365 * @area: VMA 3366 * 3367 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3368 * this function is invoked implicitly. 3369 */ 3370 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3371 struct vm_area_struct *area) 3372 { 3373 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3374 #ifdef CONFIG_GENERIC_ALLOCATOR 3375 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3376 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3377 return remap_pfn_range(area, area->vm_start, 3378 substream->dma_buffer.addr >> PAGE_SHIFT, 3379 area->vm_end - area->vm_start, area->vm_page_prot); 3380 } 3381 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3382 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3383 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3384 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3385 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3386 area, 3387 substream->runtime->dma_area, 3388 substream->runtime->dma_addr, 3389 substream->runtime->dma_bytes); 3390 #endif /* CONFIG_X86 */ 3391 /* mmap with fault handler */ 3392 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3393 return 0; 3394 } 3395 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3396 3397 /* 3398 * mmap the DMA buffer on I/O memory area 3399 */ 3400 #if SNDRV_PCM_INFO_MMAP_IOMEM 3401 /** 3402 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3403 * @substream: PCM substream 3404 * @area: VMA 3405 * 3406 * When your hardware uses the iomapped pages as the hardware buffer and 3407 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3408 * is supposed to work only on limited architectures. 3409 */ 3410 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3411 struct vm_area_struct *area) 3412 { 3413 struct snd_pcm_runtime *runtime = substream->runtime; 3414 3415 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3416 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3417 } 3418 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3419 #endif /* SNDRV_PCM_INFO_MMAP */ 3420 3421 /* 3422 * mmap DMA buffer 3423 */ 3424 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3425 struct vm_area_struct *area) 3426 { 3427 struct snd_pcm_runtime *runtime; 3428 long size; 3429 unsigned long offset; 3430 size_t dma_bytes; 3431 int err; 3432 3433 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3434 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3435 return -EINVAL; 3436 } else { 3437 if (!(area->vm_flags & VM_READ)) 3438 return -EINVAL; 3439 } 3440 runtime = substream->runtime; 3441 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3442 return -EBADFD; 3443 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3444 return -ENXIO; 3445 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3446 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3447 return -EINVAL; 3448 size = area->vm_end - area->vm_start; 3449 offset = area->vm_pgoff << PAGE_SHIFT; 3450 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3451 if ((size_t)size > dma_bytes) 3452 return -EINVAL; 3453 if (offset > dma_bytes - size) 3454 return -EINVAL; 3455 3456 area->vm_ops = &snd_pcm_vm_ops_data; 3457 area->vm_private_data = substream; 3458 if (substream->ops->mmap) 3459 err = substream->ops->mmap(substream, area); 3460 else 3461 err = snd_pcm_lib_default_mmap(substream, area); 3462 if (!err) 3463 atomic_inc(&substream->mmap_count); 3464 return err; 3465 } 3466 EXPORT_SYMBOL(snd_pcm_mmap_data); 3467 3468 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3469 { 3470 struct snd_pcm_file * pcm_file; 3471 struct snd_pcm_substream *substream; 3472 unsigned long offset; 3473 3474 pcm_file = file->private_data; 3475 substream = pcm_file->substream; 3476 if (PCM_RUNTIME_CHECK(substream)) 3477 return -ENXIO; 3478 3479 offset = area->vm_pgoff << PAGE_SHIFT; 3480 switch (offset) { 3481 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3482 if (!pcm_status_mmap_allowed(pcm_file)) 3483 return -ENXIO; 3484 return snd_pcm_mmap_status(substream, file, area); 3485 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3486 if (!pcm_control_mmap_allowed(pcm_file)) 3487 return -ENXIO; 3488 return snd_pcm_mmap_control(substream, file, area); 3489 default: 3490 return snd_pcm_mmap_data(substream, file, area); 3491 } 3492 return 0; 3493 } 3494 3495 static int snd_pcm_fasync(int fd, struct file * file, int on) 3496 { 3497 struct snd_pcm_file * pcm_file; 3498 struct snd_pcm_substream *substream; 3499 struct snd_pcm_runtime *runtime; 3500 3501 pcm_file = file->private_data; 3502 substream = pcm_file->substream; 3503 if (PCM_RUNTIME_CHECK(substream)) 3504 return -ENXIO; 3505 runtime = substream->runtime; 3506 return fasync_helper(fd, file, on, &runtime->fasync); 3507 } 3508 3509 /* 3510 * ioctl32 compat 3511 */ 3512 #ifdef CONFIG_COMPAT 3513 #include "pcm_compat.c" 3514 #else 3515 #define snd_pcm_ioctl_compat NULL 3516 #endif 3517 3518 /* 3519 * To be removed helpers to keep binary compatibility 3520 */ 3521 3522 #ifdef CONFIG_SND_SUPPORT_OLD_API 3523 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3524 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3525 3526 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3527 struct snd_pcm_hw_params_old *oparams) 3528 { 3529 unsigned int i; 3530 3531 memset(params, 0, sizeof(*params)); 3532 params->flags = oparams->flags; 3533 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3534 params->masks[i].bits[0] = oparams->masks[i]; 3535 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3536 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3537 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3538 params->info = oparams->info; 3539 params->msbits = oparams->msbits; 3540 params->rate_num = oparams->rate_num; 3541 params->rate_den = oparams->rate_den; 3542 params->fifo_size = oparams->fifo_size; 3543 } 3544 3545 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3546 struct snd_pcm_hw_params *params) 3547 { 3548 unsigned int i; 3549 3550 memset(oparams, 0, sizeof(*oparams)); 3551 oparams->flags = params->flags; 3552 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3553 oparams->masks[i] = params->masks[i].bits[0]; 3554 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3555 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3556 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3557 oparams->info = params->info; 3558 oparams->msbits = params->msbits; 3559 oparams->rate_num = params->rate_num; 3560 oparams->rate_den = params->rate_den; 3561 oparams->fifo_size = params->fifo_size; 3562 } 3563 3564 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3565 struct snd_pcm_hw_params_old __user * _oparams) 3566 { 3567 struct snd_pcm_hw_params *params; 3568 struct snd_pcm_hw_params_old *oparams = NULL; 3569 int err; 3570 3571 params = kmalloc(sizeof(*params), GFP_KERNEL); 3572 if (!params) 3573 return -ENOMEM; 3574 3575 oparams = memdup_user(_oparams, sizeof(*oparams)); 3576 if (IS_ERR(oparams)) { 3577 err = PTR_ERR(oparams); 3578 goto out; 3579 } 3580 snd_pcm_hw_convert_from_old_params(params, oparams); 3581 err = snd_pcm_hw_refine(substream, params); 3582 if (err < 0) 3583 goto out_old; 3584 3585 err = fixup_unreferenced_params(substream, params); 3586 if (err < 0) 3587 goto out_old; 3588 3589 snd_pcm_hw_convert_to_old_params(oparams, params); 3590 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3591 err = -EFAULT; 3592 out_old: 3593 kfree(oparams); 3594 out: 3595 kfree(params); 3596 return err; 3597 } 3598 3599 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3600 struct snd_pcm_hw_params_old __user * _oparams) 3601 { 3602 struct snd_pcm_hw_params *params; 3603 struct snd_pcm_hw_params_old *oparams = NULL; 3604 int err; 3605 3606 params = kmalloc(sizeof(*params), GFP_KERNEL); 3607 if (!params) 3608 return -ENOMEM; 3609 3610 oparams = memdup_user(_oparams, sizeof(*oparams)); 3611 if (IS_ERR(oparams)) { 3612 err = PTR_ERR(oparams); 3613 goto out; 3614 } 3615 3616 snd_pcm_hw_convert_from_old_params(params, oparams); 3617 err = snd_pcm_hw_params(substream, params); 3618 if (err < 0) 3619 goto out_old; 3620 3621 snd_pcm_hw_convert_to_old_params(oparams, params); 3622 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3623 err = -EFAULT; 3624 out_old: 3625 kfree(oparams); 3626 out: 3627 kfree(params); 3628 return err; 3629 } 3630 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3631 3632 #ifndef CONFIG_MMU 3633 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3634 unsigned long addr, 3635 unsigned long len, 3636 unsigned long pgoff, 3637 unsigned long flags) 3638 { 3639 struct snd_pcm_file *pcm_file = file->private_data; 3640 struct snd_pcm_substream *substream = pcm_file->substream; 3641 struct snd_pcm_runtime *runtime = substream->runtime; 3642 unsigned long offset = pgoff << PAGE_SHIFT; 3643 3644 switch (offset) { 3645 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3646 return (unsigned long)runtime->status; 3647 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3648 return (unsigned long)runtime->control; 3649 default: 3650 return (unsigned long)runtime->dma_area + offset; 3651 } 3652 } 3653 #else 3654 # define snd_pcm_get_unmapped_area NULL 3655 #endif 3656 3657 /* 3658 * Register section 3659 */ 3660 3661 const struct file_operations snd_pcm_f_ops[2] = { 3662 { 3663 .owner = THIS_MODULE, 3664 .write = snd_pcm_write, 3665 .write_iter = snd_pcm_writev, 3666 .open = snd_pcm_playback_open, 3667 .release = snd_pcm_release, 3668 .llseek = no_llseek, 3669 .poll = snd_pcm_poll, 3670 .unlocked_ioctl = snd_pcm_ioctl, 3671 .compat_ioctl = snd_pcm_ioctl_compat, 3672 .mmap = snd_pcm_mmap, 3673 .fasync = snd_pcm_fasync, 3674 .get_unmapped_area = snd_pcm_get_unmapped_area, 3675 }, 3676 { 3677 .owner = THIS_MODULE, 3678 .read = snd_pcm_read, 3679 .read_iter = snd_pcm_readv, 3680 .open = snd_pcm_capture_open, 3681 .release = snd_pcm_release, 3682 .llseek = no_llseek, 3683 .poll = snd_pcm_poll, 3684 .unlocked_ioctl = snd_pcm_ioctl, 3685 .compat_ioctl = snd_pcm_ioctl_compat, 3686 .mmap = snd_pcm_mmap, 3687 .fasync = snd_pcm_fasync, 3688 .get_unmapped_area = snd_pcm_get_unmapped_area, 3689 } 3690 }; 3691