1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Digital Audio (PCM) abstract layer 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 5 */ 6 7 #include <linux/mm.h> 8 #include <linux/module.h> 9 #include <linux/file.h> 10 #include <linux/slab.h> 11 #include <linux/sched/signal.h> 12 #include <linux/time.h> 13 #include <linux/pm_qos.h> 14 #include <linux/io.h> 15 #include <linux/dma-mapping.h> 16 #include <sound/core.h> 17 #include <sound/control.h> 18 #include <sound/info.h> 19 #include <sound/pcm.h> 20 #include <sound/pcm_params.h> 21 #include <sound/timer.h> 22 #include <sound/minors.h> 23 #include <linux/uio.h> 24 #include <linux/delay.h> 25 26 #include "pcm_local.h" 27 28 #ifdef CONFIG_SND_DEBUG 29 #define CREATE_TRACE_POINTS 30 #include "pcm_param_trace.h" 31 #else 32 #define trace_hw_mask_param_enabled() 0 33 #define trace_hw_interval_param_enabled() 0 34 #define trace_hw_mask_param(substream, type, index, prev, curr) 35 #define trace_hw_interval_param(substream, type, index, prev, curr) 36 #endif 37 38 /* 39 * Compatibility 40 */ 41 42 struct snd_pcm_hw_params_old { 43 unsigned int flags; 44 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 45 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 46 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 47 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 48 unsigned int rmask; 49 unsigned int cmask; 50 unsigned int info; 51 unsigned int msbits; 52 unsigned int rate_num; 53 unsigned int rate_den; 54 snd_pcm_uframes_t fifo_size; 55 unsigned char reserved[64]; 56 }; 57 58 #ifdef CONFIG_SND_SUPPORT_OLD_API 59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 61 62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 63 struct snd_pcm_hw_params_old __user * _oparams); 64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 65 struct snd_pcm_hw_params_old __user * _oparams); 66 #endif 67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 68 69 /* 70 * 71 */ 72 73 static DECLARE_RWSEM(snd_pcm_link_rwsem); 74 75 void snd_pcm_group_init(struct snd_pcm_group *group) 76 { 77 spin_lock_init(&group->lock); 78 mutex_init(&group->mutex); 79 INIT_LIST_HEAD(&group->substreams); 80 refcount_set(&group->refs, 0); 81 } 82 83 /* define group lock helpers */ 84 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ 85 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 86 { \ 87 if (nonatomic) \ 88 mutex_ ## mutex_action(&group->mutex); \ 89 else \ 90 spin_ ## action(&group->lock); \ 91 } 92 93 DEFINE_PCM_GROUP_LOCK(lock, lock); 94 DEFINE_PCM_GROUP_LOCK(unlock, unlock); 95 DEFINE_PCM_GROUP_LOCK(lock_irq, lock); 96 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); 97 98 /** 99 * snd_pcm_stream_lock - Lock the PCM stream 100 * @substream: PCM substream 101 * 102 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 103 * flag of the given substream. This also takes the global link rw lock 104 * (or rw sem), too, for avoiding the race with linked streams. 105 */ 106 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 107 { 108 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); 109 } 110 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 111 112 /** 113 * snd_pcm_stream_lock - Unlock the PCM stream 114 * @substream: PCM substream 115 * 116 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 117 */ 118 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 119 { 120 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); 121 } 122 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 123 124 /** 125 * snd_pcm_stream_lock_irq - Lock the PCM stream 126 * @substream: PCM substream 127 * 128 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 129 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 130 * as snd_pcm_stream_lock(). 131 */ 132 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 133 { 134 snd_pcm_group_lock_irq(&substream->self_group, 135 substream->pcm->nonatomic); 136 } 137 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 138 139 /** 140 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 141 * @substream: PCM substream 142 * 143 * This is a counter-part of snd_pcm_stream_lock_irq(). 144 */ 145 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 146 { 147 snd_pcm_group_unlock_irq(&substream->self_group, 148 substream->pcm->nonatomic); 149 } 150 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 151 152 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 153 { 154 unsigned long flags = 0; 155 if (substream->pcm->nonatomic) 156 mutex_lock(&substream->self_group.mutex); 157 else 158 spin_lock_irqsave(&substream->self_group.lock, flags); 159 return flags; 160 } 161 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 162 163 /** 164 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 165 * @substream: PCM substream 166 * @flags: irq flags 167 * 168 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 169 */ 170 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 171 unsigned long flags) 172 { 173 if (substream->pcm->nonatomic) 174 mutex_unlock(&substream->self_group.mutex); 175 else 176 spin_unlock_irqrestore(&substream->self_group.lock, flags); 177 } 178 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 179 180 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 181 { 182 struct snd_pcm *pcm = substream->pcm; 183 struct snd_pcm_str *pstr = substream->pstr; 184 185 memset(info, 0, sizeof(*info)); 186 info->card = pcm->card->number; 187 info->device = pcm->device; 188 info->stream = substream->stream; 189 info->subdevice = substream->number; 190 strlcpy(info->id, pcm->id, sizeof(info->id)); 191 strlcpy(info->name, pcm->name, sizeof(info->name)); 192 info->dev_class = pcm->dev_class; 193 info->dev_subclass = pcm->dev_subclass; 194 info->subdevices_count = pstr->substream_count; 195 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 196 strlcpy(info->subname, substream->name, sizeof(info->subname)); 197 198 return 0; 199 } 200 201 int snd_pcm_info_user(struct snd_pcm_substream *substream, 202 struct snd_pcm_info __user * _info) 203 { 204 struct snd_pcm_info *info; 205 int err; 206 207 info = kmalloc(sizeof(*info), GFP_KERNEL); 208 if (! info) 209 return -ENOMEM; 210 err = snd_pcm_info(substream, info); 211 if (err >= 0) { 212 if (copy_to_user(_info, info, sizeof(*info))) 213 err = -EFAULT; 214 } 215 kfree(info); 216 return err; 217 } 218 219 static bool hw_support_mmap(struct snd_pcm_substream *substream) 220 { 221 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 222 return false; 223 /* architecture supports dma_mmap_coherent()? */ 224 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) 225 if (!substream->ops->mmap && 226 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 227 return false; 228 #endif 229 return true; 230 } 231 232 static int constrain_mask_params(struct snd_pcm_substream *substream, 233 struct snd_pcm_hw_params *params) 234 { 235 struct snd_pcm_hw_constraints *constrs = 236 &substream->runtime->hw_constraints; 237 struct snd_mask *m; 238 unsigned int k; 239 struct snd_mask old_mask; 240 int changed; 241 242 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 243 m = hw_param_mask(params, k); 244 if (snd_mask_empty(m)) 245 return -EINVAL; 246 247 /* This parameter is not requested to change by a caller. */ 248 if (!(params->rmask & (1 << k))) 249 continue; 250 251 if (trace_hw_mask_param_enabled()) 252 old_mask = *m; 253 254 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 255 if (changed < 0) 256 return changed; 257 if (changed == 0) 258 continue; 259 260 /* Set corresponding flag so that the caller gets it. */ 261 trace_hw_mask_param(substream, k, 0, &old_mask, m); 262 params->cmask |= 1 << k; 263 } 264 265 return 0; 266 } 267 268 static int constrain_interval_params(struct snd_pcm_substream *substream, 269 struct snd_pcm_hw_params *params) 270 { 271 struct snd_pcm_hw_constraints *constrs = 272 &substream->runtime->hw_constraints; 273 struct snd_interval *i; 274 unsigned int k; 275 struct snd_interval old_interval; 276 int changed; 277 278 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 279 i = hw_param_interval(params, k); 280 if (snd_interval_empty(i)) 281 return -EINVAL; 282 283 /* This parameter is not requested to change by a caller. */ 284 if (!(params->rmask & (1 << k))) 285 continue; 286 287 if (trace_hw_interval_param_enabled()) 288 old_interval = *i; 289 290 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 291 if (changed < 0) 292 return changed; 293 if (changed == 0) 294 continue; 295 296 /* Set corresponding flag so that the caller gets it. */ 297 trace_hw_interval_param(substream, k, 0, &old_interval, i); 298 params->cmask |= 1 << k; 299 } 300 301 return 0; 302 } 303 304 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 305 struct snd_pcm_hw_params *params) 306 { 307 struct snd_pcm_hw_constraints *constrs = 308 &substream->runtime->hw_constraints; 309 unsigned int k; 310 unsigned int *rstamps; 311 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 312 unsigned int stamp; 313 struct snd_pcm_hw_rule *r; 314 unsigned int d; 315 struct snd_mask old_mask; 316 struct snd_interval old_interval; 317 bool again; 318 int changed, err = 0; 319 320 /* 321 * Each application of rule has own sequence number. 322 * 323 * Each member of 'rstamps' array represents the sequence number of 324 * recent application of corresponding rule. 325 */ 326 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 327 if (!rstamps) 328 return -ENOMEM; 329 330 /* 331 * Each member of 'vstamps' array represents the sequence number of 332 * recent application of rule in which corresponding parameters were 333 * changed. 334 * 335 * In initial state, elements corresponding to parameters requested by 336 * a caller is 1. For unrequested parameters, corresponding members 337 * have 0 so that the parameters are never changed anymore. 338 */ 339 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 340 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 341 342 /* Due to the above design, actual sequence number starts at 2. */ 343 stamp = 2; 344 retry: 345 /* Apply all rules in order. */ 346 again = false; 347 for (k = 0; k < constrs->rules_num; k++) { 348 r = &constrs->rules[k]; 349 350 /* 351 * Check condition bits of this rule. When the rule has 352 * some condition bits, parameter without the bits is 353 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 354 * is an example of the condition bits. 355 */ 356 if (r->cond && !(r->cond & params->flags)) 357 continue; 358 359 /* 360 * The 'deps' array includes maximum three dependencies 361 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 362 * member of this array is a sentinel and should be 363 * negative value. 364 * 365 * This rule should be processed in this time when dependent 366 * parameters were changed at former applications of the other 367 * rules. 368 */ 369 for (d = 0; r->deps[d] >= 0; d++) { 370 if (vstamps[r->deps[d]] > rstamps[k]) 371 break; 372 } 373 if (r->deps[d] < 0) 374 continue; 375 376 if (trace_hw_mask_param_enabled()) { 377 if (hw_is_mask(r->var)) 378 old_mask = *hw_param_mask(params, r->var); 379 } 380 if (trace_hw_interval_param_enabled()) { 381 if (hw_is_interval(r->var)) 382 old_interval = *hw_param_interval(params, r->var); 383 } 384 385 changed = r->func(params, r); 386 if (changed < 0) { 387 err = changed; 388 goto out; 389 } 390 391 /* 392 * When the parameter is changed, notify it to the caller 393 * by corresponding returned bit, then preparing for next 394 * iteration. 395 */ 396 if (changed && r->var >= 0) { 397 if (hw_is_mask(r->var)) { 398 trace_hw_mask_param(substream, r->var, 399 k + 1, &old_mask, 400 hw_param_mask(params, r->var)); 401 } 402 if (hw_is_interval(r->var)) { 403 trace_hw_interval_param(substream, r->var, 404 k + 1, &old_interval, 405 hw_param_interval(params, r->var)); 406 } 407 408 params->cmask |= (1 << r->var); 409 vstamps[r->var] = stamp; 410 again = true; 411 } 412 413 rstamps[k] = stamp++; 414 } 415 416 /* Iterate to evaluate all rules till no parameters are changed. */ 417 if (again) 418 goto retry; 419 420 out: 421 kfree(rstamps); 422 return err; 423 } 424 425 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 426 struct snd_pcm_hw_params *params) 427 { 428 const struct snd_interval *i; 429 const struct snd_mask *m; 430 int err; 431 432 if (!params->msbits) { 433 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 434 if (snd_interval_single(i)) 435 params->msbits = snd_interval_value(i); 436 } 437 438 if (!params->rate_den) { 439 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 440 if (snd_interval_single(i)) { 441 params->rate_num = snd_interval_value(i); 442 params->rate_den = 1; 443 } 444 } 445 446 if (!params->fifo_size) { 447 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 448 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 449 if (snd_mask_single(m) && snd_interval_single(i)) { 450 err = substream->ops->ioctl(substream, 451 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 452 if (err < 0) 453 return err; 454 } 455 } 456 457 if (!params->info) { 458 params->info = substream->runtime->hw.info; 459 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 460 SNDRV_PCM_INFO_DRAIN_TRIGGER); 461 if (!hw_support_mmap(substream)) 462 params->info &= ~(SNDRV_PCM_INFO_MMAP | 463 SNDRV_PCM_INFO_MMAP_VALID); 464 } 465 466 return 0; 467 } 468 469 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 470 struct snd_pcm_hw_params *params) 471 { 472 int err; 473 474 params->info = 0; 475 params->fifo_size = 0; 476 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 477 params->msbits = 0; 478 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 479 params->rate_num = 0; 480 params->rate_den = 0; 481 } 482 483 err = constrain_mask_params(substream, params); 484 if (err < 0) 485 return err; 486 487 err = constrain_interval_params(substream, params); 488 if (err < 0) 489 return err; 490 491 err = constrain_params_by_rules(substream, params); 492 if (err < 0) 493 return err; 494 495 params->rmask = 0; 496 497 return 0; 498 } 499 EXPORT_SYMBOL(snd_pcm_hw_refine); 500 501 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 502 struct snd_pcm_hw_params __user * _params) 503 { 504 struct snd_pcm_hw_params *params; 505 int err; 506 507 params = memdup_user(_params, sizeof(*params)); 508 if (IS_ERR(params)) 509 return PTR_ERR(params); 510 511 err = snd_pcm_hw_refine(substream, params); 512 if (err < 0) 513 goto end; 514 515 err = fixup_unreferenced_params(substream, params); 516 if (err < 0) 517 goto end; 518 519 if (copy_to_user(_params, params, sizeof(*params))) 520 err = -EFAULT; 521 end: 522 kfree(params); 523 return err; 524 } 525 526 static int period_to_usecs(struct snd_pcm_runtime *runtime) 527 { 528 int usecs; 529 530 if (! runtime->rate) 531 return -1; /* invalid */ 532 533 /* take 75% of period time as the deadline */ 534 usecs = (750000 / runtime->rate) * runtime->period_size; 535 usecs += ((750000 % runtime->rate) * runtime->period_size) / 536 runtime->rate; 537 538 return usecs; 539 } 540 541 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 542 { 543 snd_pcm_stream_lock_irq(substream); 544 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 545 substream->runtime->status->state = state; 546 snd_pcm_stream_unlock_irq(substream); 547 } 548 549 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 550 int event) 551 { 552 #ifdef CONFIG_SND_PCM_TIMER 553 if (substream->timer) 554 snd_timer_notify(substream->timer, event, 555 &substream->runtime->trigger_tstamp); 556 #endif 557 } 558 559 /** 560 * snd_pcm_hw_param_choose - choose a configuration defined by @params 561 * @pcm: PCM instance 562 * @params: the hw_params instance 563 * 564 * Choose one configuration from configuration space defined by @params. 565 * The configuration chosen is that obtained fixing in this order: 566 * first access, first format, first subformat, min channels, 567 * min rate, min period time, max buffer size, min tick time 568 * 569 * Return: Zero if successful, or a negative error code on failure. 570 */ 571 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 572 struct snd_pcm_hw_params *params) 573 { 574 static const int vars[] = { 575 SNDRV_PCM_HW_PARAM_ACCESS, 576 SNDRV_PCM_HW_PARAM_FORMAT, 577 SNDRV_PCM_HW_PARAM_SUBFORMAT, 578 SNDRV_PCM_HW_PARAM_CHANNELS, 579 SNDRV_PCM_HW_PARAM_RATE, 580 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 581 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 582 SNDRV_PCM_HW_PARAM_TICK_TIME, 583 -1 584 }; 585 const int *v; 586 struct snd_mask old_mask; 587 struct snd_interval old_interval; 588 int changed; 589 590 for (v = vars; *v != -1; v++) { 591 /* Keep old parameter to trace. */ 592 if (trace_hw_mask_param_enabled()) { 593 if (hw_is_mask(*v)) 594 old_mask = *hw_param_mask(params, *v); 595 } 596 if (trace_hw_interval_param_enabled()) { 597 if (hw_is_interval(*v)) 598 old_interval = *hw_param_interval(params, *v); 599 } 600 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 601 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 602 else 603 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 604 if (changed < 0) 605 return changed; 606 if (changed == 0) 607 continue; 608 609 /* Trace the changed parameter. */ 610 if (hw_is_mask(*v)) { 611 trace_hw_mask_param(pcm, *v, 0, &old_mask, 612 hw_param_mask(params, *v)); 613 } 614 if (hw_is_interval(*v)) { 615 trace_hw_interval_param(pcm, *v, 0, &old_interval, 616 hw_param_interval(params, *v)); 617 } 618 } 619 620 return 0; 621 } 622 623 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 624 struct snd_pcm_hw_params *params) 625 { 626 struct snd_pcm_runtime *runtime; 627 int err, usecs; 628 unsigned int bits; 629 snd_pcm_uframes_t frames; 630 631 if (PCM_RUNTIME_CHECK(substream)) 632 return -ENXIO; 633 runtime = substream->runtime; 634 snd_pcm_stream_lock_irq(substream); 635 switch (runtime->status->state) { 636 case SNDRV_PCM_STATE_OPEN: 637 case SNDRV_PCM_STATE_SETUP: 638 case SNDRV_PCM_STATE_PREPARED: 639 break; 640 default: 641 snd_pcm_stream_unlock_irq(substream); 642 return -EBADFD; 643 } 644 snd_pcm_stream_unlock_irq(substream); 645 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 646 if (!substream->oss.oss) 647 #endif 648 if (atomic_read(&substream->mmap_count)) 649 return -EBADFD; 650 651 params->rmask = ~0U; 652 err = snd_pcm_hw_refine(substream, params); 653 if (err < 0) 654 goto _error; 655 656 err = snd_pcm_hw_params_choose(substream, params); 657 if (err < 0) 658 goto _error; 659 660 err = fixup_unreferenced_params(substream, params); 661 if (err < 0) 662 goto _error; 663 664 if (substream->ops->hw_params != NULL) { 665 err = substream->ops->hw_params(substream, params); 666 if (err < 0) 667 goto _error; 668 } 669 670 runtime->access = params_access(params); 671 runtime->format = params_format(params); 672 runtime->subformat = params_subformat(params); 673 runtime->channels = params_channels(params); 674 runtime->rate = params_rate(params); 675 runtime->period_size = params_period_size(params); 676 runtime->periods = params_periods(params); 677 runtime->buffer_size = params_buffer_size(params); 678 runtime->info = params->info; 679 runtime->rate_num = params->rate_num; 680 runtime->rate_den = params->rate_den; 681 runtime->no_period_wakeup = 682 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 683 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 684 685 bits = snd_pcm_format_physical_width(runtime->format); 686 runtime->sample_bits = bits; 687 bits *= runtime->channels; 688 runtime->frame_bits = bits; 689 frames = 1; 690 while (bits % 8 != 0) { 691 bits *= 2; 692 frames *= 2; 693 } 694 runtime->byte_align = bits / 8; 695 runtime->min_align = frames; 696 697 /* Default sw params */ 698 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 699 runtime->period_step = 1; 700 runtime->control->avail_min = runtime->period_size; 701 runtime->start_threshold = 1; 702 runtime->stop_threshold = runtime->buffer_size; 703 runtime->silence_threshold = 0; 704 runtime->silence_size = 0; 705 runtime->boundary = runtime->buffer_size; 706 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 707 runtime->boundary *= 2; 708 709 snd_pcm_timer_resolution_change(substream); 710 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 711 712 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 713 pm_qos_remove_request(&substream->latency_pm_qos_req); 714 if ((usecs = period_to_usecs(runtime)) >= 0) 715 pm_qos_add_request(&substream->latency_pm_qos_req, 716 PM_QOS_CPU_DMA_LATENCY, usecs); 717 return 0; 718 _error: 719 /* hardware might be unusable from this time, 720 so we force application to retry to set 721 the correct hardware parameter settings */ 722 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 723 if (substream->ops->hw_free != NULL) 724 substream->ops->hw_free(substream); 725 return err; 726 } 727 728 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 729 struct snd_pcm_hw_params __user * _params) 730 { 731 struct snd_pcm_hw_params *params; 732 int err; 733 734 params = memdup_user(_params, sizeof(*params)); 735 if (IS_ERR(params)) 736 return PTR_ERR(params); 737 738 err = snd_pcm_hw_params(substream, params); 739 if (err < 0) 740 goto end; 741 742 if (copy_to_user(_params, params, sizeof(*params))) 743 err = -EFAULT; 744 end: 745 kfree(params); 746 return err; 747 } 748 749 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 750 { 751 struct snd_pcm_runtime *runtime; 752 int result = 0; 753 754 if (PCM_RUNTIME_CHECK(substream)) 755 return -ENXIO; 756 runtime = substream->runtime; 757 snd_pcm_stream_lock_irq(substream); 758 switch (runtime->status->state) { 759 case SNDRV_PCM_STATE_SETUP: 760 case SNDRV_PCM_STATE_PREPARED: 761 break; 762 default: 763 snd_pcm_stream_unlock_irq(substream); 764 return -EBADFD; 765 } 766 snd_pcm_stream_unlock_irq(substream); 767 if (atomic_read(&substream->mmap_count)) 768 return -EBADFD; 769 if (substream->ops->hw_free) 770 result = substream->ops->hw_free(substream); 771 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 772 pm_qos_remove_request(&substream->latency_pm_qos_req); 773 return result; 774 } 775 776 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 777 struct snd_pcm_sw_params *params) 778 { 779 struct snd_pcm_runtime *runtime; 780 int err; 781 782 if (PCM_RUNTIME_CHECK(substream)) 783 return -ENXIO; 784 runtime = substream->runtime; 785 snd_pcm_stream_lock_irq(substream); 786 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 787 snd_pcm_stream_unlock_irq(substream); 788 return -EBADFD; 789 } 790 snd_pcm_stream_unlock_irq(substream); 791 792 if (params->tstamp_mode < 0 || 793 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 794 return -EINVAL; 795 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 796 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 797 return -EINVAL; 798 if (params->avail_min == 0) 799 return -EINVAL; 800 if (params->silence_size >= runtime->boundary) { 801 if (params->silence_threshold != 0) 802 return -EINVAL; 803 } else { 804 if (params->silence_size > params->silence_threshold) 805 return -EINVAL; 806 if (params->silence_threshold > runtime->buffer_size) 807 return -EINVAL; 808 } 809 err = 0; 810 snd_pcm_stream_lock_irq(substream); 811 runtime->tstamp_mode = params->tstamp_mode; 812 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 813 runtime->tstamp_type = params->tstamp_type; 814 runtime->period_step = params->period_step; 815 runtime->control->avail_min = params->avail_min; 816 runtime->start_threshold = params->start_threshold; 817 runtime->stop_threshold = params->stop_threshold; 818 runtime->silence_threshold = params->silence_threshold; 819 runtime->silence_size = params->silence_size; 820 params->boundary = runtime->boundary; 821 if (snd_pcm_running(substream)) { 822 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 823 runtime->silence_size > 0) 824 snd_pcm_playback_silence(substream, ULONG_MAX); 825 err = snd_pcm_update_state(substream, runtime); 826 } 827 snd_pcm_stream_unlock_irq(substream); 828 return err; 829 } 830 831 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 832 struct snd_pcm_sw_params __user * _params) 833 { 834 struct snd_pcm_sw_params params; 835 int err; 836 if (copy_from_user(¶ms, _params, sizeof(params))) 837 return -EFAULT; 838 err = snd_pcm_sw_params(substream, ¶ms); 839 if (copy_to_user(_params, ¶ms, sizeof(params))) 840 return -EFAULT; 841 return err; 842 } 843 844 static inline snd_pcm_uframes_t 845 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 846 { 847 snd_pcm_uframes_t delay; 848 849 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 850 delay = snd_pcm_playback_hw_avail(substream->runtime); 851 else 852 delay = snd_pcm_capture_avail(substream->runtime); 853 return delay + substream->runtime->delay; 854 } 855 856 int snd_pcm_status(struct snd_pcm_substream *substream, 857 struct snd_pcm_status *status) 858 { 859 struct snd_pcm_runtime *runtime = substream->runtime; 860 861 snd_pcm_stream_lock_irq(substream); 862 863 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 864 &runtime->audio_tstamp_config); 865 866 /* backwards compatible behavior */ 867 if (runtime->audio_tstamp_config.type_requested == 868 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 869 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 870 runtime->audio_tstamp_config.type_requested = 871 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 872 else 873 runtime->audio_tstamp_config.type_requested = 874 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 875 runtime->audio_tstamp_report.valid = 0; 876 } else 877 runtime->audio_tstamp_report.valid = 1; 878 879 status->state = runtime->status->state; 880 status->suspended_state = runtime->status->suspended_state; 881 if (status->state == SNDRV_PCM_STATE_OPEN) 882 goto _end; 883 status->trigger_tstamp = runtime->trigger_tstamp; 884 if (snd_pcm_running(substream)) { 885 snd_pcm_update_hw_ptr(substream); 886 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 887 status->tstamp = runtime->status->tstamp; 888 status->driver_tstamp = runtime->driver_tstamp; 889 status->audio_tstamp = 890 runtime->status->audio_tstamp; 891 if (runtime->audio_tstamp_report.valid == 1) 892 /* backwards compatibility, no report provided in COMPAT mode */ 893 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 894 &status->audio_tstamp_accuracy, 895 &runtime->audio_tstamp_report); 896 897 goto _tstamp_end; 898 } 899 } else { 900 /* get tstamp only in fallback mode and only if enabled */ 901 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 902 snd_pcm_gettime(runtime, &status->tstamp); 903 } 904 _tstamp_end: 905 status->appl_ptr = runtime->control->appl_ptr; 906 status->hw_ptr = runtime->status->hw_ptr; 907 status->avail = snd_pcm_avail(substream); 908 status->delay = snd_pcm_running(substream) ? 909 snd_pcm_calc_delay(substream) : 0; 910 status->avail_max = runtime->avail_max; 911 status->overrange = runtime->overrange; 912 runtime->avail_max = 0; 913 runtime->overrange = 0; 914 _end: 915 snd_pcm_stream_unlock_irq(substream); 916 return 0; 917 } 918 919 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 920 struct snd_pcm_status __user * _status, 921 bool ext) 922 { 923 struct snd_pcm_status status; 924 int res; 925 926 memset(&status, 0, sizeof(status)); 927 /* 928 * with extension, parameters are read/write, 929 * get audio_tstamp_data from user, 930 * ignore rest of status structure 931 */ 932 if (ext && get_user(status.audio_tstamp_data, 933 (u32 __user *)(&_status->audio_tstamp_data))) 934 return -EFAULT; 935 res = snd_pcm_status(substream, &status); 936 if (res < 0) 937 return res; 938 if (copy_to_user(_status, &status, sizeof(status))) 939 return -EFAULT; 940 return 0; 941 } 942 943 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 944 struct snd_pcm_channel_info * info) 945 { 946 struct snd_pcm_runtime *runtime; 947 unsigned int channel; 948 949 channel = info->channel; 950 runtime = substream->runtime; 951 snd_pcm_stream_lock_irq(substream); 952 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 953 snd_pcm_stream_unlock_irq(substream); 954 return -EBADFD; 955 } 956 snd_pcm_stream_unlock_irq(substream); 957 if (channel >= runtime->channels) 958 return -EINVAL; 959 memset(info, 0, sizeof(*info)); 960 info->channel = channel; 961 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 962 } 963 964 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 965 struct snd_pcm_channel_info __user * _info) 966 { 967 struct snd_pcm_channel_info info; 968 int res; 969 970 if (copy_from_user(&info, _info, sizeof(info))) 971 return -EFAULT; 972 res = snd_pcm_channel_info(substream, &info); 973 if (res < 0) 974 return res; 975 if (copy_to_user(_info, &info, sizeof(info))) 976 return -EFAULT; 977 return 0; 978 } 979 980 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 981 { 982 struct snd_pcm_runtime *runtime = substream->runtime; 983 if (runtime->trigger_master == NULL) 984 return; 985 if (runtime->trigger_master == substream) { 986 if (!runtime->trigger_tstamp_latched) 987 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 988 } else { 989 snd_pcm_trigger_tstamp(runtime->trigger_master); 990 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 991 } 992 runtime->trigger_master = NULL; 993 } 994 995 struct action_ops { 996 int (*pre_action)(struct snd_pcm_substream *substream, int state); 997 int (*do_action)(struct snd_pcm_substream *substream, int state); 998 void (*undo_action)(struct snd_pcm_substream *substream, int state); 999 void (*post_action)(struct snd_pcm_substream *substream, int state); 1000 }; 1001 1002 /* 1003 * this functions is core for handling of linked stream 1004 * Note: the stream state might be changed also on failure 1005 * Note2: call with calling stream lock + link lock 1006 */ 1007 static int snd_pcm_action_group(const struct action_ops *ops, 1008 struct snd_pcm_substream *substream, 1009 int state, int do_lock) 1010 { 1011 struct snd_pcm_substream *s = NULL; 1012 struct snd_pcm_substream *s1; 1013 int res = 0, depth = 1; 1014 1015 snd_pcm_group_for_each_entry(s, substream) { 1016 if (do_lock && s != substream) { 1017 if (s->pcm->nonatomic) 1018 mutex_lock_nested(&s->self_group.mutex, depth); 1019 else 1020 spin_lock_nested(&s->self_group.lock, depth); 1021 depth++; 1022 } 1023 res = ops->pre_action(s, state); 1024 if (res < 0) 1025 goto _unlock; 1026 } 1027 snd_pcm_group_for_each_entry(s, substream) { 1028 res = ops->do_action(s, state); 1029 if (res < 0) { 1030 if (ops->undo_action) { 1031 snd_pcm_group_for_each_entry(s1, substream) { 1032 if (s1 == s) /* failed stream */ 1033 break; 1034 ops->undo_action(s1, state); 1035 } 1036 } 1037 s = NULL; /* unlock all */ 1038 goto _unlock; 1039 } 1040 } 1041 snd_pcm_group_for_each_entry(s, substream) { 1042 ops->post_action(s, state); 1043 } 1044 _unlock: 1045 if (do_lock) { 1046 /* unlock streams */ 1047 snd_pcm_group_for_each_entry(s1, substream) { 1048 if (s1 != substream) { 1049 if (s1->pcm->nonatomic) 1050 mutex_unlock(&s1->self_group.mutex); 1051 else 1052 spin_unlock(&s1->self_group.lock); 1053 } 1054 if (s1 == s) /* end */ 1055 break; 1056 } 1057 } 1058 return res; 1059 } 1060 1061 /* 1062 * Note: call with stream lock 1063 */ 1064 static int snd_pcm_action_single(const struct action_ops *ops, 1065 struct snd_pcm_substream *substream, 1066 int state) 1067 { 1068 int res; 1069 1070 res = ops->pre_action(substream, state); 1071 if (res < 0) 1072 return res; 1073 res = ops->do_action(substream, state); 1074 if (res == 0) 1075 ops->post_action(substream, state); 1076 else if (ops->undo_action) 1077 ops->undo_action(substream, state); 1078 return res; 1079 } 1080 1081 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1082 struct snd_pcm_group *new_group) 1083 { 1084 substream->group = new_group; 1085 list_move(&substream->link_list, &new_group->substreams); 1086 } 1087 1088 /* 1089 * Unref and unlock the group, but keep the stream lock; 1090 * when the group becomes empty and no longer referred, destroy itself 1091 */ 1092 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1093 struct snd_pcm_substream *substream) 1094 { 1095 bool do_free; 1096 1097 if (!group) 1098 return; 1099 do_free = refcount_dec_and_test(&group->refs) && 1100 list_empty(&group->substreams); 1101 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1102 if (do_free) 1103 kfree(group); 1104 } 1105 1106 /* 1107 * Lock the group inside a stream lock and reference it; 1108 * return the locked group object, or NULL if not linked 1109 */ 1110 static struct snd_pcm_group * 1111 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1112 { 1113 bool nonatomic = substream->pcm->nonatomic; 1114 struct snd_pcm_group *group; 1115 bool trylock; 1116 1117 for (;;) { 1118 if (!snd_pcm_stream_linked(substream)) 1119 return NULL; 1120 group = substream->group; 1121 /* block freeing the group object */ 1122 refcount_inc(&group->refs); 1123 1124 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1125 spin_trylock(&group->lock); 1126 if (trylock) 1127 break; /* OK */ 1128 1129 /* re-lock for avoiding ABBA deadlock */ 1130 snd_pcm_stream_unlock(substream); 1131 snd_pcm_group_lock(group, nonatomic); 1132 snd_pcm_stream_lock(substream); 1133 1134 /* check the group again; the above opens a small race window */ 1135 if (substream->group == group) 1136 break; /* OK */ 1137 /* group changed, try again */ 1138 snd_pcm_group_unref(group, substream); 1139 } 1140 return group; 1141 } 1142 1143 /* 1144 * Note: call with stream lock 1145 */ 1146 static int snd_pcm_action(const struct action_ops *ops, 1147 struct snd_pcm_substream *substream, 1148 int state) 1149 { 1150 struct snd_pcm_group *group; 1151 int res; 1152 1153 group = snd_pcm_stream_group_ref(substream); 1154 if (group) 1155 res = snd_pcm_action_group(ops, substream, state, 1); 1156 else 1157 res = snd_pcm_action_single(ops, substream, state); 1158 snd_pcm_group_unref(group, substream); 1159 return res; 1160 } 1161 1162 /* 1163 * Note: don't use any locks before 1164 */ 1165 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1166 struct snd_pcm_substream *substream, 1167 int state) 1168 { 1169 int res; 1170 1171 snd_pcm_stream_lock_irq(substream); 1172 res = snd_pcm_action(ops, substream, state); 1173 snd_pcm_stream_unlock_irq(substream); 1174 return res; 1175 } 1176 1177 /* 1178 */ 1179 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1180 struct snd_pcm_substream *substream, 1181 int state) 1182 { 1183 int res; 1184 1185 /* Guarantee the group members won't change during non-atomic action */ 1186 down_read(&snd_pcm_link_rwsem); 1187 if (snd_pcm_stream_linked(substream)) 1188 res = snd_pcm_action_group(ops, substream, state, 0); 1189 else 1190 res = snd_pcm_action_single(ops, substream, state); 1191 up_read(&snd_pcm_link_rwsem); 1192 return res; 1193 } 1194 1195 /* 1196 * start callbacks 1197 */ 1198 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1199 { 1200 struct snd_pcm_runtime *runtime = substream->runtime; 1201 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1202 return -EBADFD; 1203 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1204 !snd_pcm_playback_data(substream)) 1205 return -EPIPE; 1206 runtime->trigger_tstamp_latched = false; 1207 runtime->trigger_master = substream; 1208 return 0; 1209 } 1210 1211 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1212 { 1213 if (substream->runtime->trigger_master != substream) 1214 return 0; 1215 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1216 } 1217 1218 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1219 { 1220 if (substream->runtime->trigger_master == substream) 1221 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1222 } 1223 1224 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1225 { 1226 struct snd_pcm_runtime *runtime = substream->runtime; 1227 snd_pcm_trigger_tstamp(substream); 1228 runtime->hw_ptr_jiffies = jiffies; 1229 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1230 runtime->rate; 1231 runtime->status->state = state; 1232 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1233 runtime->silence_size > 0) 1234 snd_pcm_playback_silence(substream, ULONG_MAX); 1235 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1236 } 1237 1238 static const struct action_ops snd_pcm_action_start = { 1239 .pre_action = snd_pcm_pre_start, 1240 .do_action = snd_pcm_do_start, 1241 .undo_action = snd_pcm_undo_start, 1242 .post_action = snd_pcm_post_start 1243 }; 1244 1245 /** 1246 * snd_pcm_start - start all linked streams 1247 * @substream: the PCM substream instance 1248 * 1249 * Return: Zero if successful, or a negative error code. 1250 * The stream lock must be acquired before calling this function. 1251 */ 1252 int snd_pcm_start(struct snd_pcm_substream *substream) 1253 { 1254 return snd_pcm_action(&snd_pcm_action_start, substream, 1255 SNDRV_PCM_STATE_RUNNING); 1256 } 1257 1258 /* take the stream lock and start the streams */ 1259 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1260 { 1261 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1262 SNDRV_PCM_STATE_RUNNING); 1263 } 1264 1265 /* 1266 * stop callbacks 1267 */ 1268 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1269 { 1270 struct snd_pcm_runtime *runtime = substream->runtime; 1271 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1272 return -EBADFD; 1273 runtime->trigger_master = substream; 1274 return 0; 1275 } 1276 1277 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1278 { 1279 if (substream->runtime->trigger_master == substream && 1280 snd_pcm_running(substream)) 1281 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1282 return 0; /* unconditonally stop all substreams */ 1283 } 1284 1285 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1286 { 1287 struct snd_pcm_runtime *runtime = substream->runtime; 1288 if (runtime->status->state != state) { 1289 snd_pcm_trigger_tstamp(substream); 1290 runtime->status->state = state; 1291 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1292 } 1293 wake_up(&runtime->sleep); 1294 wake_up(&runtime->tsleep); 1295 } 1296 1297 static const struct action_ops snd_pcm_action_stop = { 1298 .pre_action = snd_pcm_pre_stop, 1299 .do_action = snd_pcm_do_stop, 1300 .post_action = snd_pcm_post_stop 1301 }; 1302 1303 /** 1304 * snd_pcm_stop - try to stop all running streams in the substream group 1305 * @substream: the PCM substream instance 1306 * @state: PCM state after stopping the stream 1307 * 1308 * The state of each stream is then changed to the given state unconditionally. 1309 * 1310 * Return: Zero if successful, or a negative error code. 1311 */ 1312 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1313 { 1314 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1315 } 1316 EXPORT_SYMBOL(snd_pcm_stop); 1317 1318 /** 1319 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1320 * @substream: the PCM substream 1321 * 1322 * After stopping, the state is changed to SETUP. 1323 * Unlike snd_pcm_stop(), this affects only the given stream. 1324 * 1325 * Return: Zero if succesful, or a negative error code. 1326 */ 1327 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1328 { 1329 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1330 SNDRV_PCM_STATE_SETUP); 1331 } 1332 1333 /** 1334 * snd_pcm_stop_xrun - stop the running streams as XRUN 1335 * @substream: the PCM substream instance 1336 * 1337 * This stops the given running substream (and all linked substreams) as XRUN. 1338 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1339 * 1340 * Return: Zero if successful, or a negative error code. 1341 */ 1342 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1343 { 1344 unsigned long flags; 1345 1346 snd_pcm_stream_lock_irqsave(substream, flags); 1347 if (substream->runtime && snd_pcm_running(substream)) 1348 __snd_pcm_xrun(substream); 1349 snd_pcm_stream_unlock_irqrestore(substream, flags); 1350 return 0; 1351 } 1352 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1353 1354 /* 1355 * pause callbacks 1356 */ 1357 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1358 { 1359 struct snd_pcm_runtime *runtime = substream->runtime; 1360 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1361 return -ENOSYS; 1362 if (push) { 1363 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1364 return -EBADFD; 1365 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1366 return -EBADFD; 1367 runtime->trigger_master = substream; 1368 return 0; 1369 } 1370 1371 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1372 { 1373 if (substream->runtime->trigger_master != substream) 1374 return 0; 1375 /* some drivers might use hw_ptr to recover from the pause - 1376 update the hw_ptr now */ 1377 if (push) 1378 snd_pcm_update_hw_ptr(substream); 1379 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1380 * a delta between the current jiffies, this gives a large enough 1381 * delta, effectively to skip the check once. 1382 */ 1383 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1384 return substream->ops->trigger(substream, 1385 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1386 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1387 } 1388 1389 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1390 { 1391 if (substream->runtime->trigger_master == substream) 1392 substream->ops->trigger(substream, 1393 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1394 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1395 } 1396 1397 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1398 { 1399 struct snd_pcm_runtime *runtime = substream->runtime; 1400 snd_pcm_trigger_tstamp(substream); 1401 if (push) { 1402 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1403 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1404 wake_up(&runtime->sleep); 1405 wake_up(&runtime->tsleep); 1406 } else { 1407 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1408 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1409 } 1410 } 1411 1412 static const struct action_ops snd_pcm_action_pause = { 1413 .pre_action = snd_pcm_pre_pause, 1414 .do_action = snd_pcm_do_pause, 1415 .undo_action = snd_pcm_undo_pause, 1416 .post_action = snd_pcm_post_pause 1417 }; 1418 1419 /* 1420 * Push/release the pause for all linked streams. 1421 */ 1422 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1423 { 1424 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1425 } 1426 1427 #ifdef CONFIG_PM 1428 /* suspend */ 1429 1430 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1431 { 1432 struct snd_pcm_runtime *runtime = substream->runtime; 1433 switch (runtime->status->state) { 1434 case SNDRV_PCM_STATE_SUSPENDED: 1435 return -EBUSY; 1436 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1437 case SNDRV_PCM_STATE_OPEN: 1438 case SNDRV_PCM_STATE_SETUP: 1439 case SNDRV_PCM_STATE_DISCONNECTED: 1440 return -EBUSY; 1441 } 1442 runtime->trigger_master = substream; 1443 return 0; 1444 } 1445 1446 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1447 { 1448 struct snd_pcm_runtime *runtime = substream->runtime; 1449 if (runtime->trigger_master != substream) 1450 return 0; 1451 if (! snd_pcm_running(substream)) 1452 return 0; 1453 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1454 return 0; /* suspend unconditionally */ 1455 } 1456 1457 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1458 { 1459 struct snd_pcm_runtime *runtime = substream->runtime; 1460 snd_pcm_trigger_tstamp(substream); 1461 runtime->status->suspended_state = runtime->status->state; 1462 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1463 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1464 wake_up(&runtime->sleep); 1465 wake_up(&runtime->tsleep); 1466 } 1467 1468 static const struct action_ops snd_pcm_action_suspend = { 1469 .pre_action = snd_pcm_pre_suspend, 1470 .do_action = snd_pcm_do_suspend, 1471 .post_action = snd_pcm_post_suspend 1472 }; 1473 1474 /* 1475 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1476 * @substream: the PCM substream 1477 * 1478 * After this call, all streams are changed to SUSPENDED state. 1479 * 1480 * Return: Zero if successful, or a negative error code. 1481 */ 1482 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1483 { 1484 int err; 1485 unsigned long flags; 1486 1487 snd_pcm_stream_lock_irqsave(substream, flags); 1488 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1489 snd_pcm_stream_unlock_irqrestore(substream, flags); 1490 return err; 1491 } 1492 1493 /** 1494 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1495 * @pcm: the PCM instance 1496 * 1497 * After this call, all streams are changed to SUSPENDED state. 1498 * 1499 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1500 */ 1501 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1502 { 1503 struct snd_pcm_substream *substream; 1504 int stream, err = 0; 1505 1506 if (! pcm) 1507 return 0; 1508 1509 for (stream = 0; stream < 2; stream++) { 1510 for (substream = pcm->streams[stream].substream; 1511 substream; substream = substream->next) { 1512 /* FIXME: the open/close code should lock this as well */ 1513 if (substream->runtime == NULL) 1514 continue; 1515 1516 /* 1517 * Skip BE dai link PCM's that are internal and may 1518 * not have their substream ops set. 1519 */ 1520 if (!substream->ops) 1521 continue; 1522 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 /* 1810 * Drain the stream(s). 1811 * When the substream is linked, sync until the draining of all playback streams 1812 * is finished. 1813 * After this call, all streams are supposed to be either SETUP or DRAINING 1814 * (capture only) state. 1815 */ 1816 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1817 struct file *file) 1818 { 1819 struct snd_card *card; 1820 struct snd_pcm_runtime *runtime; 1821 struct snd_pcm_substream *s; 1822 struct snd_pcm_group *group; 1823 wait_queue_entry_t wait; 1824 int result = 0; 1825 int nonblock = 0; 1826 1827 card = substream->pcm->card; 1828 runtime = substream->runtime; 1829 1830 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1831 return -EBADFD; 1832 1833 if (file) { 1834 if (file->f_flags & O_NONBLOCK) 1835 nonblock = 1; 1836 } else if (substream->f_flags & O_NONBLOCK) 1837 nonblock = 1; 1838 1839 snd_pcm_stream_lock_irq(substream); 1840 /* resume pause */ 1841 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1842 snd_pcm_pause(substream, 0); 1843 1844 /* pre-start/stop - all running streams are changed to DRAINING state */ 1845 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1846 if (result < 0) 1847 goto unlock; 1848 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1849 if (nonblock) { 1850 result = -EAGAIN; 1851 goto unlock; 1852 } 1853 1854 for (;;) { 1855 long tout; 1856 struct snd_pcm_runtime *to_check; 1857 if (signal_pending(current)) { 1858 result = -ERESTARTSYS; 1859 break; 1860 } 1861 /* find a substream to drain */ 1862 to_check = NULL; 1863 group = snd_pcm_stream_group_ref(substream); 1864 snd_pcm_group_for_each_entry(s, substream) { 1865 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1866 continue; 1867 runtime = s->runtime; 1868 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1869 to_check = runtime; 1870 break; 1871 } 1872 } 1873 snd_pcm_group_unref(group, substream); 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 if (runtime->no_period_wakeup) 1880 tout = MAX_SCHEDULE_TIMEOUT; 1881 else { 1882 tout = 10; 1883 if (runtime->rate) { 1884 long t = runtime->period_size * 2 / runtime->rate; 1885 tout = max(t, tout); 1886 } 1887 tout = msecs_to_jiffies(tout * 1000); 1888 } 1889 tout = schedule_timeout_interruptible(tout); 1890 1891 snd_pcm_stream_lock_irq(substream); 1892 group = snd_pcm_stream_group_ref(substream); 1893 snd_pcm_group_for_each_entry(s, substream) { 1894 if (s->runtime == to_check) { 1895 remove_wait_queue(&to_check->sleep, &wait); 1896 break; 1897 } 1898 } 1899 snd_pcm_group_unref(group, substream); 1900 1901 if (card->shutdown) { 1902 result = -ENODEV; 1903 break; 1904 } 1905 if (tout == 0) { 1906 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1907 result = -ESTRPIPE; 1908 else { 1909 dev_dbg(substream->pcm->card->dev, 1910 "playback drain error (DMA or IRQ trouble?)\n"); 1911 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1912 result = -EIO; 1913 } 1914 break; 1915 } 1916 } 1917 1918 unlock: 1919 snd_pcm_stream_unlock_irq(substream); 1920 1921 return result; 1922 } 1923 1924 /* 1925 * drop ioctl 1926 * 1927 * Immediately put all linked substreams into SETUP state. 1928 */ 1929 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1930 { 1931 struct snd_pcm_runtime *runtime; 1932 int result = 0; 1933 1934 if (PCM_RUNTIME_CHECK(substream)) 1935 return -ENXIO; 1936 runtime = substream->runtime; 1937 1938 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1939 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1940 return -EBADFD; 1941 1942 snd_pcm_stream_lock_irq(substream); 1943 /* resume pause */ 1944 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1945 snd_pcm_pause(substream, 0); 1946 1947 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1948 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1949 snd_pcm_stream_unlock_irq(substream); 1950 1951 return result; 1952 } 1953 1954 1955 static bool is_pcm_file(struct file *file) 1956 { 1957 struct inode *inode = file_inode(file); 1958 struct snd_pcm *pcm; 1959 unsigned int minor; 1960 1961 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1962 return false; 1963 minor = iminor(inode); 1964 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 1965 if (!pcm) 1966 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1967 if (!pcm) 1968 return false; 1969 snd_card_unref(pcm->card); 1970 return true; 1971 } 1972 1973 /* 1974 * PCM link handling 1975 */ 1976 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1977 { 1978 int res = 0; 1979 struct snd_pcm_file *pcm_file; 1980 struct snd_pcm_substream *substream1; 1981 struct snd_pcm_group *group, *target_group; 1982 bool nonatomic = substream->pcm->nonatomic; 1983 struct fd f = fdget(fd); 1984 1985 if (!f.file) 1986 return -EBADFD; 1987 if (!is_pcm_file(f.file)) { 1988 res = -EBADFD; 1989 goto _badf; 1990 } 1991 pcm_file = f.file->private_data; 1992 substream1 = pcm_file->substream; 1993 group = kzalloc(sizeof(*group), GFP_KERNEL); 1994 if (!group) { 1995 res = -ENOMEM; 1996 goto _nolock; 1997 } 1998 snd_pcm_group_init(group); 1999 2000 down_write(&snd_pcm_link_rwsem); 2001 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2002 substream->runtime->status->state != substream1->runtime->status->state || 2003 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2004 res = -EBADFD; 2005 goto _end; 2006 } 2007 if (snd_pcm_stream_linked(substream1)) { 2008 res = -EALREADY; 2009 goto _end; 2010 } 2011 2012 snd_pcm_stream_lock_irq(substream); 2013 if (!snd_pcm_stream_linked(substream)) { 2014 snd_pcm_group_assign(substream, group); 2015 group = NULL; /* assigned, don't free this one below */ 2016 } 2017 target_group = substream->group; 2018 snd_pcm_stream_unlock_irq(substream); 2019 2020 snd_pcm_group_lock_irq(target_group, nonatomic); 2021 snd_pcm_stream_lock(substream1); 2022 snd_pcm_group_assign(substream1, target_group); 2023 snd_pcm_stream_unlock(substream1); 2024 snd_pcm_group_unlock_irq(target_group, nonatomic); 2025 _end: 2026 up_write(&snd_pcm_link_rwsem); 2027 _nolock: 2028 kfree(group); 2029 _badf: 2030 fdput(f); 2031 return res; 2032 } 2033 2034 static void relink_to_local(struct snd_pcm_substream *substream) 2035 { 2036 snd_pcm_stream_lock(substream); 2037 snd_pcm_group_assign(substream, &substream->self_group); 2038 snd_pcm_stream_unlock(substream); 2039 } 2040 2041 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2042 { 2043 struct snd_pcm_group *group; 2044 bool nonatomic = substream->pcm->nonatomic; 2045 bool do_free = false; 2046 int res = 0; 2047 2048 down_write(&snd_pcm_link_rwsem); 2049 2050 if (!snd_pcm_stream_linked(substream)) { 2051 res = -EALREADY; 2052 goto _end; 2053 } 2054 2055 group = substream->group; 2056 snd_pcm_group_lock_irq(group, nonatomic); 2057 2058 relink_to_local(substream); 2059 2060 /* detach the last stream, too */ 2061 if (list_is_singular(&group->substreams)) { 2062 relink_to_local(list_first_entry(&group->substreams, 2063 struct snd_pcm_substream, 2064 link_list)); 2065 do_free = !refcount_read(&group->refs); 2066 } 2067 2068 snd_pcm_group_unlock_irq(group, nonatomic); 2069 if (do_free) 2070 kfree(group); 2071 2072 _end: 2073 up_write(&snd_pcm_link_rwsem); 2074 return res; 2075 } 2076 2077 /* 2078 * hw configurator 2079 */ 2080 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2081 struct snd_pcm_hw_rule *rule) 2082 { 2083 struct snd_interval t; 2084 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2085 hw_param_interval_c(params, rule->deps[1]), &t); 2086 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2087 } 2088 2089 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2090 struct snd_pcm_hw_rule *rule) 2091 { 2092 struct snd_interval t; 2093 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2094 hw_param_interval_c(params, rule->deps[1]), &t); 2095 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2096 } 2097 2098 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2099 struct snd_pcm_hw_rule *rule) 2100 { 2101 struct snd_interval t; 2102 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2103 hw_param_interval_c(params, rule->deps[1]), 2104 (unsigned long) rule->private, &t); 2105 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2106 } 2107 2108 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2109 struct snd_pcm_hw_rule *rule) 2110 { 2111 struct snd_interval t; 2112 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2113 (unsigned long) rule->private, 2114 hw_param_interval_c(params, rule->deps[1]), &t); 2115 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2116 } 2117 2118 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2119 struct snd_pcm_hw_rule *rule) 2120 { 2121 unsigned int k; 2122 const struct snd_interval *i = 2123 hw_param_interval_c(params, rule->deps[0]); 2124 struct snd_mask m; 2125 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2126 snd_mask_any(&m); 2127 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2128 int bits; 2129 if (! snd_mask_test(mask, k)) 2130 continue; 2131 bits = snd_pcm_format_physical_width(k); 2132 if (bits <= 0) 2133 continue; /* ignore invalid formats */ 2134 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2135 snd_mask_reset(&m, k); 2136 } 2137 return snd_mask_refine(mask, &m); 2138 } 2139 2140 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2141 struct snd_pcm_hw_rule *rule) 2142 { 2143 struct snd_interval t; 2144 unsigned int k; 2145 t.min = UINT_MAX; 2146 t.max = 0; 2147 t.openmin = 0; 2148 t.openmax = 0; 2149 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2150 int bits; 2151 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2152 continue; 2153 bits = snd_pcm_format_physical_width(k); 2154 if (bits <= 0) 2155 continue; /* ignore invalid formats */ 2156 if (t.min > (unsigned)bits) 2157 t.min = bits; 2158 if (t.max < (unsigned)bits) 2159 t.max = bits; 2160 } 2161 t.integer = 1; 2162 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2163 } 2164 2165 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2166 #error "Change this table" 2167 #endif 2168 2169 static const unsigned int rates[] = { 2170 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2171 48000, 64000, 88200, 96000, 176400, 192000 2172 }; 2173 2174 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2175 .count = ARRAY_SIZE(rates), 2176 .list = rates, 2177 }; 2178 2179 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2180 struct snd_pcm_hw_rule *rule) 2181 { 2182 struct snd_pcm_hardware *hw = rule->private; 2183 return snd_interval_list(hw_param_interval(params, rule->var), 2184 snd_pcm_known_rates.count, 2185 snd_pcm_known_rates.list, hw->rates); 2186 } 2187 2188 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2189 struct snd_pcm_hw_rule *rule) 2190 { 2191 struct snd_interval t; 2192 struct snd_pcm_substream *substream = rule->private; 2193 t.min = 0; 2194 t.max = substream->buffer_bytes_max; 2195 t.openmin = 0; 2196 t.openmax = 0; 2197 t.integer = 1; 2198 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2199 } 2200 2201 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2202 { 2203 struct snd_pcm_runtime *runtime = substream->runtime; 2204 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2205 int k, err; 2206 2207 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2208 snd_mask_any(constrs_mask(constrs, k)); 2209 } 2210 2211 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2212 snd_interval_any(constrs_interval(constrs, k)); 2213 } 2214 2215 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2216 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2217 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2218 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2219 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2220 2221 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2222 snd_pcm_hw_rule_format, NULL, 2223 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2224 if (err < 0) 2225 return err; 2226 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2227 snd_pcm_hw_rule_sample_bits, NULL, 2228 SNDRV_PCM_HW_PARAM_FORMAT, 2229 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2230 if (err < 0) 2231 return err; 2232 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2233 snd_pcm_hw_rule_div, NULL, 2234 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2235 if (err < 0) 2236 return err; 2237 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2238 snd_pcm_hw_rule_mul, NULL, 2239 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2240 if (err < 0) 2241 return err; 2242 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2243 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2244 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2245 if (err < 0) 2246 return err; 2247 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2248 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2249 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2250 if (err < 0) 2251 return err; 2252 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2253 snd_pcm_hw_rule_div, NULL, 2254 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2255 if (err < 0) 2256 return err; 2257 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2258 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2259 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2260 if (err < 0) 2261 return err; 2262 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2263 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2264 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2265 if (err < 0) 2266 return err; 2267 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2268 snd_pcm_hw_rule_div, NULL, 2269 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2270 if (err < 0) 2271 return err; 2272 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2273 snd_pcm_hw_rule_div, NULL, 2274 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2275 if (err < 0) 2276 return err; 2277 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2278 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2279 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2280 if (err < 0) 2281 return err; 2282 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2283 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2284 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2285 if (err < 0) 2286 return err; 2287 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2288 snd_pcm_hw_rule_mul, NULL, 2289 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2290 if (err < 0) 2291 return err; 2292 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2293 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2294 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2295 if (err < 0) 2296 return err; 2297 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2298 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2299 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2300 if (err < 0) 2301 return err; 2302 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2303 snd_pcm_hw_rule_muldivk, (void*) 8, 2304 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2305 if (err < 0) 2306 return err; 2307 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2308 snd_pcm_hw_rule_muldivk, (void*) 8, 2309 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2310 if (err < 0) 2311 return err; 2312 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2313 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2314 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2315 if (err < 0) 2316 return err; 2317 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2318 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2319 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2320 if (err < 0) 2321 return err; 2322 return 0; 2323 } 2324 2325 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2326 { 2327 struct snd_pcm_runtime *runtime = substream->runtime; 2328 struct snd_pcm_hardware *hw = &runtime->hw; 2329 int err; 2330 unsigned int mask = 0; 2331 2332 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2333 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2334 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2335 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2336 if (hw_support_mmap(substream)) { 2337 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2338 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2339 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2340 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2341 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2342 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2343 } 2344 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2345 if (err < 0) 2346 return err; 2347 2348 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2349 if (err < 0) 2350 return err; 2351 2352 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2353 if (err < 0) 2354 return err; 2355 2356 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2357 hw->channels_min, hw->channels_max); 2358 if (err < 0) 2359 return err; 2360 2361 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2362 hw->rate_min, hw->rate_max); 2363 if (err < 0) 2364 return err; 2365 2366 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2367 hw->period_bytes_min, hw->period_bytes_max); 2368 if (err < 0) 2369 return err; 2370 2371 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2372 hw->periods_min, hw->periods_max); 2373 if (err < 0) 2374 return err; 2375 2376 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2377 hw->period_bytes_min, hw->buffer_bytes_max); 2378 if (err < 0) 2379 return err; 2380 2381 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2382 snd_pcm_hw_rule_buffer_bytes_max, substream, 2383 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2384 if (err < 0) 2385 return err; 2386 2387 /* FIXME: remove */ 2388 if (runtime->dma_bytes) { 2389 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2390 if (err < 0) 2391 return err; 2392 } 2393 2394 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2395 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2396 snd_pcm_hw_rule_rate, hw, 2397 SNDRV_PCM_HW_PARAM_RATE, -1); 2398 if (err < 0) 2399 return err; 2400 } 2401 2402 /* FIXME: this belong to lowlevel */ 2403 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2404 2405 return 0; 2406 } 2407 2408 static void pcm_release_private(struct snd_pcm_substream *substream) 2409 { 2410 if (snd_pcm_stream_linked(substream)) 2411 snd_pcm_unlink(substream); 2412 } 2413 2414 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2415 { 2416 substream->ref_count--; 2417 if (substream->ref_count > 0) 2418 return; 2419 2420 snd_pcm_drop(substream); 2421 if (substream->hw_opened) { 2422 if (substream->ops->hw_free && 2423 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2424 substream->ops->hw_free(substream); 2425 substream->ops->close(substream); 2426 substream->hw_opened = 0; 2427 } 2428 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2429 pm_qos_remove_request(&substream->latency_pm_qos_req); 2430 if (substream->pcm_release) { 2431 substream->pcm_release(substream); 2432 substream->pcm_release = NULL; 2433 } 2434 snd_pcm_detach_substream(substream); 2435 } 2436 EXPORT_SYMBOL(snd_pcm_release_substream); 2437 2438 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2439 struct file *file, 2440 struct snd_pcm_substream **rsubstream) 2441 { 2442 struct snd_pcm_substream *substream; 2443 int err; 2444 2445 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2446 if (err < 0) 2447 return err; 2448 if (substream->ref_count > 1) { 2449 *rsubstream = substream; 2450 return 0; 2451 } 2452 2453 err = snd_pcm_hw_constraints_init(substream); 2454 if (err < 0) { 2455 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2456 goto error; 2457 } 2458 2459 if ((err = substream->ops->open(substream)) < 0) 2460 goto error; 2461 2462 substream->hw_opened = 1; 2463 2464 err = snd_pcm_hw_constraints_complete(substream); 2465 if (err < 0) { 2466 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2467 goto error; 2468 } 2469 2470 *rsubstream = substream; 2471 return 0; 2472 2473 error: 2474 snd_pcm_release_substream(substream); 2475 return err; 2476 } 2477 EXPORT_SYMBOL(snd_pcm_open_substream); 2478 2479 static int snd_pcm_open_file(struct file *file, 2480 struct snd_pcm *pcm, 2481 int stream) 2482 { 2483 struct snd_pcm_file *pcm_file; 2484 struct snd_pcm_substream *substream; 2485 int err; 2486 2487 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2488 if (err < 0) 2489 return err; 2490 2491 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2492 if (pcm_file == NULL) { 2493 snd_pcm_release_substream(substream); 2494 return -ENOMEM; 2495 } 2496 pcm_file->substream = substream; 2497 if (substream->ref_count == 1) 2498 substream->pcm_release = pcm_release_private; 2499 file->private_data = pcm_file; 2500 2501 return 0; 2502 } 2503 2504 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2505 { 2506 struct snd_pcm *pcm; 2507 int err = nonseekable_open(inode, file); 2508 if (err < 0) 2509 return err; 2510 pcm = snd_lookup_minor_data(iminor(inode), 2511 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2512 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2513 if (pcm) 2514 snd_card_unref(pcm->card); 2515 return err; 2516 } 2517 2518 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2519 { 2520 struct snd_pcm *pcm; 2521 int err = nonseekable_open(inode, file); 2522 if (err < 0) 2523 return err; 2524 pcm = snd_lookup_minor_data(iminor(inode), 2525 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2526 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2527 if (pcm) 2528 snd_card_unref(pcm->card); 2529 return err; 2530 } 2531 2532 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2533 { 2534 int err; 2535 wait_queue_entry_t wait; 2536 2537 if (pcm == NULL) { 2538 err = -ENODEV; 2539 goto __error1; 2540 } 2541 err = snd_card_file_add(pcm->card, file); 2542 if (err < 0) 2543 goto __error1; 2544 if (!try_module_get(pcm->card->module)) { 2545 err = -EFAULT; 2546 goto __error2; 2547 } 2548 init_waitqueue_entry(&wait, current); 2549 add_wait_queue(&pcm->open_wait, &wait); 2550 mutex_lock(&pcm->open_mutex); 2551 while (1) { 2552 err = snd_pcm_open_file(file, pcm, stream); 2553 if (err >= 0) 2554 break; 2555 if (err == -EAGAIN) { 2556 if (file->f_flags & O_NONBLOCK) { 2557 err = -EBUSY; 2558 break; 2559 } 2560 } else 2561 break; 2562 set_current_state(TASK_INTERRUPTIBLE); 2563 mutex_unlock(&pcm->open_mutex); 2564 schedule(); 2565 mutex_lock(&pcm->open_mutex); 2566 if (pcm->card->shutdown) { 2567 err = -ENODEV; 2568 break; 2569 } 2570 if (signal_pending(current)) { 2571 err = -ERESTARTSYS; 2572 break; 2573 } 2574 } 2575 remove_wait_queue(&pcm->open_wait, &wait); 2576 mutex_unlock(&pcm->open_mutex); 2577 if (err < 0) 2578 goto __error; 2579 return err; 2580 2581 __error: 2582 module_put(pcm->card->module); 2583 __error2: 2584 snd_card_file_remove(pcm->card, file); 2585 __error1: 2586 return err; 2587 } 2588 2589 static int snd_pcm_release(struct inode *inode, struct file *file) 2590 { 2591 struct snd_pcm *pcm; 2592 struct snd_pcm_substream *substream; 2593 struct snd_pcm_file *pcm_file; 2594 2595 pcm_file = file->private_data; 2596 substream = pcm_file->substream; 2597 if (snd_BUG_ON(!substream)) 2598 return -ENXIO; 2599 pcm = substream->pcm; 2600 mutex_lock(&pcm->open_mutex); 2601 snd_pcm_release_substream(substream); 2602 kfree(pcm_file); 2603 mutex_unlock(&pcm->open_mutex); 2604 wake_up(&pcm->open_wait); 2605 module_put(pcm->card->module); 2606 snd_card_file_remove(pcm->card, file); 2607 return 0; 2608 } 2609 2610 /* check and update PCM state; return 0 or a negative error 2611 * call this inside PCM lock 2612 */ 2613 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2614 { 2615 switch (substream->runtime->status->state) { 2616 case SNDRV_PCM_STATE_DRAINING: 2617 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2618 return -EBADFD; 2619 /* Fall through */ 2620 case SNDRV_PCM_STATE_RUNNING: 2621 return snd_pcm_update_hw_ptr(substream); 2622 case SNDRV_PCM_STATE_PREPARED: 2623 case SNDRV_PCM_STATE_PAUSED: 2624 return 0; 2625 case SNDRV_PCM_STATE_SUSPENDED: 2626 return -ESTRPIPE; 2627 case SNDRV_PCM_STATE_XRUN: 2628 return -EPIPE; 2629 default: 2630 return -EBADFD; 2631 } 2632 } 2633 2634 /* increase the appl_ptr; returns the processed frames or a negative error */ 2635 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2636 snd_pcm_uframes_t frames, 2637 snd_pcm_sframes_t avail) 2638 { 2639 struct snd_pcm_runtime *runtime = substream->runtime; 2640 snd_pcm_sframes_t appl_ptr; 2641 int ret; 2642 2643 if (avail <= 0) 2644 return 0; 2645 if (frames > (snd_pcm_uframes_t)avail) 2646 frames = avail; 2647 appl_ptr = runtime->control->appl_ptr + frames; 2648 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2649 appl_ptr -= runtime->boundary; 2650 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2651 return ret < 0 ? ret : frames; 2652 } 2653 2654 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2655 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2656 snd_pcm_uframes_t frames, 2657 snd_pcm_sframes_t avail) 2658 { 2659 struct snd_pcm_runtime *runtime = substream->runtime; 2660 snd_pcm_sframes_t appl_ptr; 2661 int ret; 2662 2663 if (avail <= 0) 2664 return 0; 2665 if (frames > (snd_pcm_uframes_t)avail) 2666 frames = avail; 2667 appl_ptr = runtime->control->appl_ptr - frames; 2668 if (appl_ptr < 0) 2669 appl_ptr += runtime->boundary; 2670 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2671 /* NOTE: we return zero for errors because PulseAudio gets depressed 2672 * upon receiving an error from rewind ioctl and stops processing 2673 * any longer. Returning zero means that no rewind is done, so 2674 * it's not absolutely wrong to answer like that. 2675 */ 2676 return ret < 0 ? 0 : frames; 2677 } 2678 2679 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2680 snd_pcm_uframes_t frames) 2681 { 2682 snd_pcm_sframes_t ret; 2683 2684 if (frames == 0) 2685 return 0; 2686 2687 snd_pcm_stream_lock_irq(substream); 2688 ret = do_pcm_hwsync(substream); 2689 if (!ret) 2690 ret = rewind_appl_ptr(substream, frames, 2691 snd_pcm_hw_avail(substream)); 2692 snd_pcm_stream_unlock_irq(substream); 2693 return ret; 2694 } 2695 2696 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2697 snd_pcm_uframes_t frames) 2698 { 2699 snd_pcm_sframes_t ret; 2700 2701 if (frames == 0) 2702 return 0; 2703 2704 snd_pcm_stream_lock_irq(substream); 2705 ret = do_pcm_hwsync(substream); 2706 if (!ret) 2707 ret = forward_appl_ptr(substream, frames, 2708 snd_pcm_avail(substream)); 2709 snd_pcm_stream_unlock_irq(substream); 2710 return ret; 2711 } 2712 2713 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2714 { 2715 int err; 2716 2717 snd_pcm_stream_lock_irq(substream); 2718 err = do_pcm_hwsync(substream); 2719 snd_pcm_stream_unlock_irq(substream); 2720 return err; 2721 } 2722 2723 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2724 snd_pcm_sframes_t *delay) 2725 { 2726 int err; 2727 snd_pcm_sframes_t n = 0; 2728 2729 snd_pcm_stream_lock_irq(substream); 2730 err = do_pcm_hwsync(substream); 2731 if (!err) 2732 n = snd_pcm_calc_delay(substream); 2733 snd_pcm_stream_unlock_irq(substream); 2734 if (!err) 2735 *delay = n; 2736 return err; 2737 } 2738 2739 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2740 struct snd_pcm_sync_ptr __user *_sync_ptr) 2741 { 2742 struct snd_pcm_runtime *runtime = substream->runtime; 2743 struct snd_pcm_sync_ptr sync_ptr; 2744 volatile struct snd_pcm_mmap_status *status; 2745 volatile struct snd_pcm_mmap_control *control; 2746 int err; 2747 2748 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2749 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2750 return -EFAULT; 2751 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2752 return -EFAULT; 2753 status = runtime->status; 2754 control = runtime->control; 2755 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2756 err = snd_pcm_hwsync(substream); 2757 if (err < 0) 2758 return err; 2759 } 2760 snd_pcm_stream_lock_irq(substream); 2761 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2762 err = pcm_lib_apply_appl_ptr(substream, 2763 sync_ptr.c.control.appl_ptr); 2764 if (err < 0) { 2765 snd_pcm_stream_unlock_irq(substream); 2766 return err; 2767 } 2768 } else { 2769 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2770 } 2771 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2772 control->avail_min = sync_ptr.c.control.avail_min; 2773 else 2774 sync_ptr.c.control.avail_min = control->avail_min; 2775 sync_ptr.s.status.state = status->state; 2776 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2777 sync_ptr.s.status.tstamp = status->tstamp; 2778 sync_ptr.s.status.suspended_state = status->suspended_state; 2779 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2780 snd_pcm_stream_unlock_irq(substream); 2781 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2782 return -EFAULT; 2783 return 0; 2784 } 2785 2786 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2787 { 2788 struct snd_pcm_runtime *runtime = substream->runtime; 2789 int arg; 2790 2791 if (get_user(arg, _arg)) 2792 return -EFAULT; 2793 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2794 return -EINVAL; 2795 runtime->tstamp_type = arg; 2796 return 0; 2797 } 2798 2799 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2800 struct snd_xferi __user *_xferi) 2801 { 2802 struct snd_xferi xferi; 2803 struct snd_pcm_runtime *runtime = substream->runtime; 2804 snd_pcm_sframes_t result; 2805 2806 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2807 return -EBADFD; 2808 if (put_user(0, &_xferi->result)) 2809 return -EFAULT; 2810 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2811 return -EFAULT; 2812 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2813 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2814 else 2815 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2816 __put_user(result, &_xferi->result); 2817 return result < 0 ? result : 0; 2818 } 2819 2820 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2821 struct snd_xfern __user *_xfern) 2822 { 2823 struct snd_xfern xfern; 2824 struct snd_pcm_runtime *runtime = substream->runtime; 2825 void *bufs; 2826 snd_pcm_sframes_t result; 2827 2828 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2829 return -EBADFD; 2830 if (runtime->channels > 128) 2831 return -EINVAL; 2832 if (put_user(0, &_xfern->result)) 2833 return -EFAULT; 2834 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2835 return -EFAULT; 2836 2837 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2838 if (IS_ERR(bufs)) 2839 return PTR_ERR(bufs); 2840 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2841 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2842 else 2843 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2844 kfree(bufs); 2845 __put_user(result, &_xfern->result); 2846 return result < 0 ? result : 0; 2847 } 2848 2849 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2850 snd_pcm_uframes_t __user *_frames) 2851 { 2852 snd_pcm_uframes_t frames; 2853 snd_pcm_sframes_t result; 2854 2855 if (get_user(frames, _frames)) 2856 return -EFAULT; 2857 if (put_user(0, _frames)) 2858 return -EFAULT; 2859 result = snd_pcm_rewind(substream, frames); 2860 __put_user(result, _frames); 2861 return result < 0 ? result : 0; 2862 } 2863 2864 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2865 snd_pcm_uframes_t __user *_frames) 2866 { 2867 snd_pcm_uframes_t frames; 2868 snd_pcm_sframes_t result; 2869 2870 if (get_user(frames, _frames)) 2871 return -EFAULT; 2872 if (put_user(0, _frames)) 2873 return -EFAULT; 2874 result = snd_pcm_forward(substream, frames); 2875 __put_user(result, _frames); 2876 return result < 0 ? result : 0; 2877 } 2878 2879 static int snd_pcm_common_ioctl(struct file *file, 2880 struct snd_pcm_substream *substream, 2881 unsigned int cmd, void __user *arg) 2882 { 2883 struct snd_pcm_file *pcm_file = file->private_data; 2884 int res; 2885 2886 if (PCM_RUNTIME_CHECK(substream)) 2887 return -ENXIO; 2888 2889 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2890 if (res < 0) 2891 return res; 2892 2893 switch (cmd) { 2894 case SNDRV_PCM_IOCTL_PVERSION: 2895 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2896 case SNDRV_PCM_IOCTL_INFO: 2897 return snd_pcm_info_user(substream, arg); 2898 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2899 return 0; 2900 case SNDRV_PCM_IOCTL_TTSTAMP: 2901 return snd_pcm_tstamp(substream, arg); 2902 case SNDRV_PCM_IOCTL_USER_PVERSION: 2903 if (get_user(pcm_file->user_pversion, 2904 (unsigned int __user *)arg)) 2905 return -EFAULT; 2906 return 0; 2907 case SNDRV_PCM_IOCTL_HW_REFINE: 2908 return snd_pcm_hw_refine_user(substream, arg); 2909 case SNDRV_PCM_IOCTL_HW_PARAMS: 2910 return snd_pcm_hw_params_user(substream, arg); 2911 case SNDRV_PCM_IOCTL_HW_FREE: 2912 return snd_pcm_hw_free(substream); 2913 case SNDRV_PCM_IOCTL_SW_PARAMS: 2914 return snd_pcm_sw_params_user(substream, arg); 2915 case SNDRV_PCM_IOCTL_STATUS: 2916 return snd_pcm_status_user(substream, arg, false); 2917 case SNDRV_PCM_IOCTL_STATUS_EXT: 2918 return snd_pcm_status_user(substream, arg, true); 2919 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2920 return snd_pcm_channel_info_user(substream, arg); 2921 case SNDRV_PCM_IOCTL_PREPARE: 2922 return snd_pcm_prepare(substream, file); 2923 case SNDRV_PCM_IOCTL_RESET: 2924 return snd_pcm_reset(substream); 2925 case SNDRV_PCM_IOCTL_START: 2926 return snd_pcm_start_lock_irq(substream); 2927 case SNDRV_PCM_IOCTL_LINK: 2928 return snd_pcm_link(substream, (int)(unsigned long) arg); 2929 case SNDRV_PCM_IOCTL_UNLINK: 2930 return snd_pcm_unlink(substream); 2931 case SNDRV_PCM_IOCTL_RESUME: 2932 return snd_pcm_resume(substream); 2933 case SNDRV_PCM_IOCTL_XRUN: 2934 return snd_pcm_xrun(substream); 2935 case SNDRV_PCM_IOCTL_HWSYNC: 2936 return snd_pcm_hwsync(substream); 2937 case SNDRV_PCM_IOCTL_DELAY: 2938 { 2939 snd_pcm_sframes_t delay; 2940 snd_pcm_sframes_t __user *res = arg; 2941 int err; 2942 2943 err = snd_pcm_delay(substream, &delay); 2944 if (err) 2945 return err; 2946 if (put_user(delay, res)) 2947 return -EFAULT; 2948 return 0; 2949 } 2950 case SNDRV_PCM_IOCTL_SYNC_PTR: 2951 return snd_pcm_sync_ptr(substream, arg); 2952 #ifdef CONFIG_SND_SUPPORT_OLD_API 2953 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2954 return snd_pcm_hw_refine_old_user(substream, arg); 2955 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2956 return snd_pcm_hw_params_old_user(substream, arg); 2957 #endif 2958 case SNDRV_PCM_IOCTL_DRAIN: 2959 return snd_pcm_drain(substream, file); 2960 case SNDRV_PCM_IOCTL_DROP: 2961 return snd_pcm_drop(substream); 2962 case SNDRV_PCM_IOCTL_PAUSE: 2963 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2964 substream, 2965 (int)(unsigned long)arg); 2966 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2967 case SNDRV_PCM_IOCTL_READI_FRAMES: 2968 return snd_pcm_xferi_frames_ioctl(substream, arg); 2969 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2970 case SNDRV_PCM_IOCTL_READN_FRAMES: 2971 return snd_pcm_xfern_frames_ioctl(substream, arg); 2972 case SNDRV_PCM_IOCTL_REWIND: 2973 return snd_pcm_rewind_ioctl(substream, arg); 2974 case SNDRV_PCM_IOCTL_FORWARD: 2975 return snd_pcm_forward_ioctl(substream, arg); 2976 } 2977 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2978 return -ENOTTY; 2979 } 2980 2981 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2982 unsigned long arg) 2983 { 2984 struct snd_pcm_file *pcm_file; 2985 2986 pcm_file = file->private_data; 2987 2988 if (((cmd >> 8) & 0xff) != 'A') 2989 return -ENOTTY; 2990 2991 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2992 (void __user *)arg); 2993 } 2994 2995 /** 2996 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2997 * @substream: PCM substream 2998 * @cmd: IOCTL cmd 2999 * @arg: IOCTL argument 3000 * 3001 * The function is provided primarily for OSS layer and USB gadget drivers, 3002 * and it allows only the limited set of ioctls (hw_params, sw_params, 3003 * prepare, start, drain, drop, forward). 3004 */ 3005 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3006 unsigned int cmd, void *arg) 3007 { 3008 snd_pcm_uframes_t *frames = arg; 3009 snd_pcm_sframes_t result; 3010 3011 switch (cmd) { 3012 case SNDRV_PCM_IOCTL_FORWARD: 3013 { 3014 /* provided only for OSS; capture-only and no value returned */ 3015 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3016 return -EINVAL; 3017 result = snd_pcm_forward(substream, *frames); 3018 return result < 0 ? result : 0; 3019 } 3020 case SNDRV_PCM_IOCTL_HW_PARAMS: 3021 return snd_pcm_hw_params(substream, arg); 3022 case SNDRV_PCM_IOCTL_SW_PARAMS: 3023 return snd_pcm_sw_params(substream, arg); 3024 case SNDRV_PCM_IOCTL_PREPARE: 3025 return snd_pcm_prepare(substream, NULL); 3026 case SNDRV_PCM_IOCTL_START: 3027 return snd_pcm_start_lock_irq(substream); 3028 case SNDRV_PCM_IOCTL_DRAIN: 3029 return snd_pcm_drain(substream, NULL); 3030 case SNDRV_PCM_IOCTL_DROP: 3031 return snd_pcm_drop(substream); 3032 case SNDRV_PCM_IOCTL_DELAY: 3033 return snd_pcm_delay(substream, frames); 3034 default: 3035 return -EINVAL; 3036 } 3037 } 3038 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3039 3040 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3041 loff_t * offset) 3042 { 3043 struct snd_pcm_file *pcm_file; 3044 struct snd_pcm_substream *substream; 3045 struct snd_pcm_runtime *runtime; 3046 snd_pcm_sframes_t result; 3047 3048 pcm_file = file->private_data; 3049 substream = pcm_file->substream; 3050 if (PCM_RUNTIME_CHECK(substream)) 3051 return -ENXIO; 3052 runtime = substream->runtime; 3053 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3054 return -EBADFD; 3055 if (!frame_aligned(runtime, count)) 3056 return -EINVAL; 3057 count = bytes_to_frames(runtime, count); 3058 result = snd_pcm_lib_read(substream, buf, count); 3059 if (result > 0) 3060 result = frames_to_bytes(runtime, result); 3061 return result; 3062 } 3063 3064 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3065 size_t count, loff_t * offset) 3066 { 3067 struct snd_pcm_file *pcm_file; 3068 struct snd_pcm_substream *substream; 3069 struct snd_pcm_runtime *runtime; 3070 snd_pcm_sframes_t result; 3071 3072 pcm_file = file->private_data; 3073 substream = pcm_file->substream; 3074 if (PCM_RUNTIME_CHECK(substream)) 3075 return -ENXIO; 3076 runtime = substream->runtime; 3077 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3078 return -EBADFD; 3079 if (!frame_aligned(runtime, count)) 3080 return -EINVAL; 3081 count = bytes_to_frames(runtime, count); 3082 result = snd_pcm_lib_write(substream, buf, count); 3083 if (result > 0) 3084 result = frames_to_bytes(runtime, result); 3085 return result; 3086 } 3087 3088 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3089 { 3090 struct snd_pcm_file *pcm_file; 3091 struct snd_pcm_substream *substream; 3092 struct snd_pcm_runtime *runtime; 3093 snd_pcm_sframes_t result; 3094 unsigned long i; 3095 void __user **bufs; 3096 snd_pcm_uframes_t frames; 3097 3098 pcm_file = iocb->ki_filp->private_data; 3099 substream = pcm_file->substream; 3100 if (PCM_RUNTIME_CHECK(substream)) 3101 return -ENXIO; 3102 runtime = substream->runtime; 3103 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3104 return -EBADFD; 3105 if (!iter_is_iovec(to)) 3106 return -EINVAL; 3107 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3108 return -EINVAL; 3109 if (!frame_aligned(runtime, to->iov->iov_len)) 3110 return -EINVAL; 3111 frames = bytes_to_samples(runtime, to->iov->iov_len); 3112 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3113 if (bufs == NULL) 3114 return -ENOMEM; 3115 for (i = 0; i < to->nr_segs; ++i) 3116 bufs[i] = to->iov[i].iov_base; 3117 result = snd_pcm_lib_readv(substream, bufs, frames); 3118 if (result > 0) 3119 result = frames_to_bytes(runtime, result); 3120 kfree(bufs); 3121 return result; 3122 } 3123 3124 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3125 { 3126 struct snd_pcm_file *pcm_file; 3127 struct snd_pcm_substream *substream; 3128 struct snd_pcm_runtime *runtime; 3129 snd_pcm_sframes_t result; 3130 unsigned long i; 3131 void __user **bufs; 3132 snd_pcm_uframes_t frames; 3133 3134 pcm_file = iocb->ki_filp->private_data; 3135 substream = pcm_file->substream; 3136 if (PCM_RUNTIME_CHECK(substream)) 3137 return -ENXIO; 3138 runtime = substream->runtime; 3139 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3140 return -EBADFD; 3141 if (!iter_is_iovec(from)) 3142 return -EINVAL; 3143 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3144 !frame_aligned(runtime, from->iov->iov_len)) 3145 return -EINVAL; 3146 frames = bytes_to_samples(runtime, from->iov->iov_len); 3147 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3148 if (bufs == NULL) 3149 return -ENOMEM; 3150 for (i = 0; i < from->nr_segs; ++i) 3151 bufs[i] = from->iov[i].iov_base; 3152 result = snd_pcm_lib_writev(substream, bufs, frames); 3153 if (result > 0) 3154 result = frames_to_bytes(runtime, result); 3155 kfree(bufs); 3156 return result; 3157 } 3158 3159 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3160 { 3161 struct snd_pcm_file *pcm_file; 3162 struct snd_pcm_substream *substream; 3163 struct snd_pcm_runtime *runtime; 3164 __poll_t mask, ok; 3165 snd_pcm_uframes_t avail; 3166 3167 pcm_file = file->private_data; 3168 3169 substream = pcm_file->substream; 3170 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3171 ok = EPOLLOUT | EPOLLWRNORM; 3172 else 3173 ok = EPOLLIN | EPOLLRDNORM; 3174 if (PCM_RUNTIME_CHECK(substream)) 3175 return ok | EPOLLERR; 3176 3177 runtime = substream->runtime; 3178 poll_wait(file, &runtime->sleep, wait); 3179 3180 mask = 0; 3181 snd_pcm_stream_lock_irq(substream); 3182 avail = snd_pcm_avail(substream); 3183 switch (runtime->status->state) { 3184 case SNDRV_PCM_STATE_RUNNING: 3185 case SNDRV_PCM_STATE_PREPARED: 3186 case SNDRV_PCM_STATE_PAUSED: 3187 if (avail >= runtime->control->avail_min) 3188 mask = ok; 3189 break; 3190 case SNDRV_PCM_STATE_DRAINING: 3191 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3192 mask = ok; 3193 if (!avail) 3194 mask |= EPOLLERR; 3195 } 3196 break; 3197 default: 3198 mask = ok | EPOLLERR; 3199 break; 3200 } 3201 snd_pcm_stream_unlock_irq(substream); 3202 return mask; 3203 } 3204 3205 /* 3206 * mmap support 3207 */ 3208 3209 /* 3210 * Only on coherent architectures, we can mmap the status and the control records 3211 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3212 */ 3213 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3214 /* 3215 * mmap status record 3216 */ 3217 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3218 { 3219 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3220 struct snd_pcm_runtime *runtime; 3221 3222 if (substream == NULL) 3223 return VM_FAULT_SIGBUS; 3224 runtime = substream->runtime; 3225 vmf->page = virt_to_page(runtime->status); 3226 get_page(vmf->page); 3227 return 0; 3228 } 3229 3230 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3231 { 3232 .fault = snd_pcm_mmap_status_fault, 3233 }; 3234 3235 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3236 struct vm_area_struct *area) 3237 { 3238 long size; 3239 if (!(area->vm_flags & VM_READ)) 3240 return -EINVAL; 3241 size = area->vm_end - area->vm_start; 3242 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3243 return -EINVAL; 3244 area->vm_ops = &snd_pcm_vm_ops_status; 3245 area->vm_private_data = substream; 3246 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3247 return 0; 3248 } 3249 3250 /* 3251 * mmap control record 3252 */ 3253 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3254 { 3255 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3256 struct snd_pcm_runtime *runtime; 3257 3258 if (substream == NULL) 3259 return VM_FAULT_SIGBUS; 3260 runtime = substream->runtime; 3261 vmf->page = virt_to_page(runtime->control); 3262 get_page(vmf->page); 3263 return 0; 3264 } 3265 3266 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3267 { 3268 .fault = snd_pcm_mmap_control_fault, 3269 }; 3270 3271 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3272 struct vm_area_struct *area) 3273 { 3274 long size; 3275 if (!(area->vm_flags & VM_READ)) 3276 return -EINVAL; 3277 size = area->vm_end - area->vm_start; 3278 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3279 return -EINVAL; 3280 area->vm_ops = &snd_pcm_vm_ops_control; 3281 area->vm_private_data = substream; 3282 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3283 return 0; 3284 } 3285 3286 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3287 { 3288 if (pcm_file->no_compat_mmap) 3289 return false; 3290 /* See pcm_control_mmap_allowed() below. 3291 * Since older alsa-lib requires both status and control mmaps to be 3292 * coupled, we have to disable the status mmap for old alsa-lib, too. 3293 */ 3294 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3295 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3296 return false; 3297 return true; 3298 } 3299 3300 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3301 { 3302 if (pcm_file->no_compat_mmap) 3303 return false; 3304 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3305 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3306 * thus it effectively assures the manual update of appl_ptr. 3307 */ 3308 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3309 return false; 3310 return true; 3311 } 3312 3313 #else /* ! coherent mmap */ 3314 /* 3315 * don't support mmap for status and control records. 3316 */ 3317 #define pcm_status_mmap_allowed(pcm_file) false 3318 #define pcm_control_mmap_allowed(pcm_file) false 3319 3320 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3321 struct vm_area_struct *area) 3322 { 3323 return -ENXIO; 3324 } 3325 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3326 struct vm_area_struct *area) 3327 { 3328 return -ENXIO; 3329 } 3330 #endif /* coherent mmap */ 3331 3332 static inline struct page * 3333 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3334 { 3335 void *vaddr = substream->runtime->dma_area + ofs; 3336 return virt_to_page(vaddr); 3337 } 3338 3339 /* 3340 * fault callback for mmapping a RAM page 3341 */ 3342 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3343 { 3344 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3345 struct snd_pcm_runtime *runtime; 3346 unsigned long offset; 3347 struct page * page; 3348 size_t dma_bytes; 3349 3350 if (substream == NULL) 3351 return VM_FAULT_SIGBUS; 3352 runtime = substream->runtime; 3353 offset = vmf->pgoff << PAGE_SHIFT; 3354 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3355 if (offset > dma_bytes - PAGE_SIZE) 3356 return VM_FAULT_SIGBUS; 3357 if (substream->ops->page) 3358 page = substream->ops->page(substream, offset); 3359 else 3360 page = snd_pcm_default_page_ops(substream, offset); 3361 if (!page) 3362 return VM_FAULT_SIGBUS; 3363 get_page(page); 3364 vmf->page = page; 3365 return 0; 3366 } 3367 3368 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3369 .open = snd_pcm_mmap_data_open, 3370 .close = snd_pcm_mmap_data_close, 3371 }; 3372 3373 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3374 .open = snd_pcm_mmap_data_open, 3375 .close = snd_pcm_mmap_data_close, 3376 .fault = snd_pcm_mmap_data_fault, 3377 }; 3378 3379 /* 3380 * mmap the DMA buffer on RAM 3381 */ 3382 3383 /** 3384 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3385 * @substream: PCM substream 3386 * @area: VMA 3387 * 3388 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3389 * this function is invoked implicitly. 3390 */ 3391 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3392 struct vm_area_struct *area) 3393 { 3394 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3395 #ifdef CONFIG_GENERIC_ALLOCATOR 3396 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3397 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3398 return remap_pfn_range(area, area->vm_start, 3399 substream->dma_buffer.addr >> PAGE_SHIFT, 3400 area->vm_end - area->vm_start, area->vm_page_prot); 3401 } 3402 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3403 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3404 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3405 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3406 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3407 area, 3408 substream->runtime->dma_area, 3409 substream->runtime->dma_addr, 3410 substream->runtime->dma_bytes); 3411 #endif /* CONFIG_X86 */ 3412 /* mmap with fault handler */ 3413 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3414 return 0; 3415 } 3416 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3417 3418 /* 3419 * mmap the DMA buffer on I/O memory area 3420 */ 3421 #if SNDRV_PCM_INFO_MMAP_IOMEM 3422 /** 3423 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3424 * @substream: PCM substream 3425 * @area: VMA 3426 * 3427 * When your hardware uses the iomapped pages as the hardware buffer and 3428 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3429 * is supposed to work only on limited architectures. 3430 */ 3431 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3432 struct vm_area_struct *area) 3433 { 3434 struct snd_pcm_runtime *runtime = substream->runtime; 3435 3436 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3437 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3438 } 3439 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3440 #endif /* SNDRV_PCM_INFO_MMAP */ 3441 3442 /* 3443 * mmap DMA buffer 3444 */ 3445 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3446 struct vm_area_struct *area) 3447 { 3448 struct snd_pcm_runtime *runtime; 3449 long size; 3450 unsigned long offset; 3451 size_t dma_bytes; 3452 int err; 3453 3454 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3455 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3456 return -EINVAL; 3457 } else { 3458 if (!(area->vm_flags & VM_READ)) 3459 return -EINVAL; 3460 } 3461 runtime = substream->runtime; 3462 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3463 return -EBADFD; 3464 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3465 return -ENXIO; 3466 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3467 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3468 return -EINVAL; 3469 size = area->vm_end - area->vm_start; 3470 offset = area->vm_pgoff << PAGE_SHIFT; 3471 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3472 if ((size_t)size > dma_bytes) 3473 return -EINVAL; 3474 if (offset > dma_bytes - size) 3475 return -EINVAL; 3476 3477 area->vm_ops = &snd_pcm_vm_ops_data; 3478 area->vm_private_data = substream; 3479 if (substream->ops->mmap) 3480 err = substream->ops->mmap(substream, area); 3481 else 3482 err = snd_pcm_lib_default_mmap(substream, area); 3483 if (!err) 3484 atomic_inc(&substream->mmap_count); 3485 return err; 3486 } 3487 EXPORT_SYMBOL(snd_pcm_mmap_data); 3488 3489 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3490 { 3491 struct snd_pcm_file * pcm_file; 3492 struct snd_pcm_substream *substream; 3493 unsigned long offset; 3494 3495 pcm_file = file->private_data; 3496 substream = pcm_file->substream; 3497 if (PCM_RUNTIME_CHECK(substream)) 3498 return -ENXIO; 3499 3500 offset = area->vm_pgoff << PAGE_SHIFT; 3501 switch (offset) { 3502 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3503 if (!pcm_status_mmap_allowed(pcm_file)) 3504 return -ENXIO; 3505 return snd_pcm_mmap_status(substream, file, area); 3506 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3507 if (!pcm_control_mmap_allowed(pcm_file)) 3508 return -ENXIO; 3509 return snd_pcm_mmap_control(substream, file, area); 3510 default: 3511 return snd_pcm_mmap_data(substream, file, area); 3512 } 3513 return 0; 3514 } 3515 3516 static int snd_pcm_fasync(int fd, struct file * file, int on) 3517 { 3518 struct snd_pcm_file * pcm_file; 3519 struct snd_pcm_substream *substream; 3520 struct snd_pcm_runtime *runtime; 3521 3522 pcm_file = file->private_data; 3523 substream = pcm_file->substream; 3524 if (PCM_RUNTIME_CHECK(substream)) 3525 return -ENXIO; 3526 runtime = substream->runtime; 3527 return fasync_helper(fd, file, on, &runtime->fasync); 3528 } 3529 3530 /* 3531 * ioctl32 compat 3532 */ 3533 #ifdef CONFIG_COMPAT 3534 #include "pcm_compat.c" 3535 #else 3536 #define snd_pcm_ioctl_compat NULL 3537 #endif 3538 3539 /* 3540 * To be removed helpers to keep binary compatibility 3541 */ 3542 3543 #ifdef CONFIG_SND_SUPPORT_OLD_API 3544 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3545 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3546 3547 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3548 struct snd_pcm_hw_params_old *oparams) 3549 { 3550 unsigned int i; 3551 3552 memset(params, 0, sizeof(*params)); 3553 params->flags = oparams->flags; 3554 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3555 params->masks[i].bits[0] = oparams->masks[i]; 3556 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3557 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3558 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3559 params->info = oparams->info; 3560 params->msbits = oparams->msbits; 3561 params->rate_num = oparams->rate_num; 3562 params->rate_den = oparams->rate_den; 3563 params->fifo_size = oparams->fifo_size; 3564 } 3565 3566 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3567 struct snd_pcm_hw_params *params) 3568 { 3569 unsigned int i; 3570 3571 memset(oparams, 0, sizeof(*oparams)); 3572 oparams->flags = params->flags; 3573 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3574 oparams->masks[i] = params->masks[i].bits[0]; 3575 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3576 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3577 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3578 oparams->info = params->info; 3579 oparams->msbits = params->msbits; 3580 oparams->rate_num = params->rate_num; 3581 oparams->rate_den = params->rate_den; 3582 oparams->fifo_size = params->fifo_size; 3583 } 3584 3585 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3586 struct snd_pcm_hw_params_old __user * _oparams) 3587 { 3588 struct snd_pcm_hw_params *params; 3589 struct snd_pcm_hw_params_old *oparams = NULL; 3590 int err; 3591 3592 params = kmalloc(sizeof(*params), GFP_KERNEL); 3593 if (!params) 3594 return -ENOMEM; 3595 3596 oparams = memdup_user(_oparams, sizeof(*oparams)); 3597 if (IS_ERR(oparams)) { 3598 err = PTR_ERR(oparams); 3599 goto out; 3600 } 3601 snd_pcm_hw_convert_from_old_params(params, oparams); 3602 err = snd_pcm_hw_refine(substream, params); 3603 if (err < 0) 3604 goto out_old; 3605 3606 err = fixup_unreferenced_params(substream, params); 3607 if (err < 0) 3608 goto out_old; 3609 3610 snd_pcm_hw_convert_to_old_params(oparams, params); 3611 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3612 err = -EFAULT; 3613 out_old: 3614 kfree(oparams); 3615 out: 3616 kfree(params); 3617 return err; 3618 } 3619 3620 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3621 struct snd_pcm_hw_params_old __user * _oparams) 3622 { 3623 struct snd_pcm_hw_params *params; 3624 struct snd_pcm_hw_params_old *oparams = NULL; 3625 int err; 3626 3627 params = kmalloc(sizeof(*params), GFP_KERNEL); 3628 if (!params) 3629 return -ENOMEM; 3630 3631 oparams = memdup_user(_oparams, sizeof(*oparams)); 3632 if (IS_ERR(oparams)) { 3633 err = PTR_ERR(oparams); 3634 goto out; 3635 } 3636 3637 snd_pcm_hw_convert_from_old_params(params, oparams); 3638 err = snd_pcm_hw_params(substream, params); 3639 if (err < 0) 3640 goto out_old; 3641 3642 snd_pcm_hw_convert_to_old_params(oparams, params); 3643 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3644 err = -EFAULT; 3645 out_old: 3646 kfree(oparams); 3647 out: 3648 kfree(params); 3649 return err; 3650 } 3651 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3652 3653 #ifndef CONFIG_MMU 3654 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3655 unsigned long addr, 3656 unsigned long len, 3657 unsigned long pgoff, 3658 unsigned long flags) 3659 { 3660 struct snd_pcm_file *pcm_file = file->private_data; 3661 struct snd_pcm_substream *substream = pcm_file->substream; 3662 struct snd_pcm_runtime *runtime = substream->runtime; 3663 unsigned long offset = pgoff << PAGE_SHIFT; 3664 3665 switch (offset) { 3666 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3667 return (unsigned long)runtime->status; 3668 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3669 return (unsigned long)runtime->control; 3670 default: 3671 return (unsigned long)runtime->dma_area + offset; 3672 } 3673 } 3674 #else 3675 # define snd_pcm_get_unmapped_area NULL 3676 #endif 3677 3678 /* 3679 * Register section 3680 */ 3681 3682 const struct file_operations snd_pcm_f_ops[2] = { 3683 { 3684 .owner = THIS_MODULE, 3685 .write = snd_pcm_write, 3686 .write_iter = snd_pcm_writev, 3687 .open = snd_pcm_playback_open, 3688 .release = snd_pcm_release, 3689 .llseek = no_llseek, 3690 .poll = snd_pcm_poll, 3691 .unlocked_ioctl = snd_pcm_ioctl, 3692 .compat_ioctl = snd_pcm_ioctl_compat, 3693 .mmap = snd_pcm_mmap, 3694 .fasync = snd_pcm_fasync, 3695 .get_unmapped_area = snd_pcm_get_unmapped_area, 3696 }, 3697 { 3698 .owner = THIS_MODULE, 3699 .read = snd_pcm_read, 3700 .read_iter = snd_pcm_readv, 3701 .open = snd_pcm_capture_open, 3702 .release = snd_pcm_release, 3703 .llseek = no_llseek, 3704 .poll = snd_pcm_poll, 3705 .unlocked_ioctl = snd_pcm_ioctl, 3706 .compat_ioctl = snd_pcm_ioctl_compat, 3707 .mmap = snd_pcm_mmap, 3708 .fasync = snd_pcm_fasync, 3709 .get_unmapped_area = snd_pcm_get_unmapped_area, 3710 } 3711 }; 3712